Precast pile end carrier ramming and expanding device

Abstract

The utility model discloses a precast pile end carrier ramming and expanding device which comprises a precast pile, a feeding guide device, a bottom guide protection pile tip and a ramming and expanding rod, wherein the feeding guide device is used for feeding a mixture into the precast pile; the bottom guide protection pile tip is fixed at the bottom of the precast pile; the bottom of the ramming and expanding rod is conical; guide pipes extending into the precast pile are formed on the feeding guide device and the bottom guide protection pile tip, and a plurality of extrusion holes are further formed in the side wall of the bottom guide protection pile tip. According to the utility model, one set of equipment can be adopted to realize the operations of driving the precast pile into a soil body and ramming and expanding a bearing layer at the pile end to form a carrier, so that the equipment is simplified, materials are saved, the construction period is shortened, the damage to the pile body in the ramming and expanding process can be avoided, the pile body is re-driven after the carrier construction is finished, and the hammer recovery standard is reached; and the pile forming quality of the pile is greatly improved, the risk of pile end settlement is further reduced, and the good anti-pulling performance is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of foundation, specifically relates to a precast pile pile end carrier ramming expansion device. BACKGROUND

[0002] The precast pile pile end carrier ramming method refers to the following method: when the pile end carrier is constructed, the pipe wall of the hollow precast pile is used as a casing, the hollow part of the precast pile is used as a construction channel for ramming rods and mixed materials, after the hammering force of a hydraulic hammer or a diesel hammer is used to ram through the ramming rods, mixed materials are sectionally poured into the hollow pile hole of the precast pile to form a pile end carrier at the end of the precast pile.

[0003] During the construction process of the precast pile carrier ramming, a certain amount of mixed materials is filled into the hollow pile hole of the precast pile in batches, and after each filling, the materials are rammed by hammering, and after the step is repeated for multiple times, the soil within a certain range below the pile end is reinforced to form a filler carrier composed of a filler body, a compacted soil body, and an affected soil body. The filler carrier forms an expanded foundation to achieve force diffusion and fully utilize the performance of the precast pile. The process can greatly reduce the pile length of the precast pile under certain geological conditions, and has considerable economic advantages compared with ordinary hammering precast piles. For example, the construction method of a prestressed pipe body and the specially-made prestressed pipe body disclosed in CN 112144522A. However, the following problems exist:

[0004] 1. Two sets of equipment are needed: first, the prestressed pipe body needs to be driven into the soil, and then the rammer needs to be used to ram the materials. The two sets of equipment are divided into two processes, which are respectively responsible by different personnel or companies, leading to the fact that the personnel responsible for the subsequent process of ramming using the rammer after the prestressed pipe body is driven into the soil may have a time gap, and during this period, if a gap appears in the bottom sealing plate, underground water may seep into the prestressed pipe body due to the incompressibility of water, resulting in the failure of subsequent ramming to form a prestressed pile pile end carrier.

[0005] 2. The bottom sealing plate of the prestressed pipe body is initially welded or bolted to the pipe pile. As described above, after the prestressed pipe body is pressed to the preset depth, the sealing plate needs to be destroyed by the rammer, and then the rammer is pulled out. After the mixed materials are added into the prestressed pipe body and rammed, the process is repeated to form an expanded pile end composite carrier. During this process, the sealing plate is fixedly connected to the prestressed pipe body, and the destruction of the sealing plate may easily cause deformation or damage to the bottom of the prestressed pipe body. Moreover, during the ramming process after the mixed materials are added, the mixed materials also impact the bottom of the prestressed pipe body, which may also easily cause deformation or damage to the bottom of the prestressed pipe body.

[0006] 3. When the materials are rammed out of the prestressed pipe body, the mixed materials mainly spread downward, and the soil on both sides of the prestressed pipe body is not mixed with concrete, which may easily cause settlement.

[0007] 4. The existing structure adopts the method of ramming, the column hammer needs to be in close contact with the prestressed pipe body, and the column hammer is used for ramming and mixing material in the form of free fall, but the column hammer will produce friction with the prestressed pipe body when falling freely, which leads to that the actual ramming force is smaller than the preset ramming force, and the ramming force is difficult to accurately control due to the uncertainty of the friction.

[0008] 5. The existing structure column hammer is easy to touch the inner wall of the prestressed pipe body when falling, which leads to that the prestressed pipe body is deformed or damaged. The utility model discloses a kind of precast pile pile end carrier ramming devices.

[0009] The utility model discloses a kind of precast pile pile end carrier ramming devices.

[0010] To solve the above problems, the technical scheme of the utility model is:

[0011] A precast pile pile end carrier ramming device, including precast pile, the guide device for feeding material for feeding mixing material to precast pile, the bottom guide protection pile tip fixed to the bottom of precast pile and the ramming rod for extruding mixing material;The bottom of the ramming rod is conical;The guide device for feeding material and the bottom guide protection pile tip are formed with guide pipe that extends into the inside of precast pile, and the bottom of the bottom guide protection pile tip is detachably connected with the sealing plate.

[0012] Further improvement, the sidewall of the bottom guide protection pile tip is formed with a plurality of extrusion holes,

[0013] Further improvement, the top surface of the sealing plate is formed with a plurality of insertion pins along the circumference, which are inserted into the bottom of the precast pile and are in interference fit with the bottom guide protection pile tip, and the top surface of the sealing plate is also fixed with a guide block, and the inner end of the guide block is formed with a guide slope, and the guide slope is located at the middle position of the sealing plate.

[0014] Further improvement, the flange plate is fixed on the guide device for feeding material and the bottom guide protection pile tip;The flange plate of the guide device for feeding material is fixedly connected with the end surface of the top end of precast pile, and the flange plate of the bottom guide protection pile tip is fixedly connected with the end surface of the bottom end of precast pile.

[0015] Further improvement, the hydraulic rod puller for pulling out the ramming rod is fixed above the guide device for feeding material;The ramming rod is marked with a scale.

[0016] Further improvement, the hydraulic rod puller includes a sleeve, the sleeve is installed with a slip along the circumference at the top, the thickness of the slip gradually increases from bottom to top, the sleeve is sleeved with a sleeve ring at the upper part, the sleeve is fixedly connected with a telescopic rod at the bottom, and the telescopic rod is connected with the sleeve ring at the top;The inner surface of the sleeve ring is arranged in close contact with the outer surface of the slip.

[0017] Further improvement, the telescopic rod is an oil cylinder, an air cylinder or an electric cylinder.

[0018] Further improvement, the bottom guide protection pile tip outer side wall is fixed with a plurality of vertical setting inverted tooth rack along the circumference.

[0019] Further improvement, the top of the feeding guide device is fixed with a U-shaped material guide groove, and the sidewall of the feeding guide device is fixed with a plurality of stiffening plates along the circumference.

[0020] The utility model has the advantages of:

[0021] 1. The utility model discloses a set of impact body can realize the operation of making the prefabricated pile end carrier, simplifies the equipment, saves the material, shortens the construction period, and since the ramming and expanding rod directly contacts the mixed material, the loss of the ramming and expanding rod ramming energy caused by underground water is avoided, and the quality of the prefabricated pile end carrier is improved by filling and tamping the material in layers from bottom to top.

[0022] 2. The special structure of the sealing plate makes it extremely easy to separate from the prefabricated pile, effectively prevents the soil from entering the prefabricated pile, avoids hindering the downward movement of the ramming and expanding rod, prevents damage to the prefabricated pile caused by separation, and moves sideways when separated, so that the ramming and expanding rod directly reaches the preset depth.

[0023] 3. Since the ramming and expanding rod is inserted into the mixed material for ramming and expanding, and the bottom of the ramming and expanding rod is conical, the mixed material is dispersed and expanded transversely, and the influence on the soil at the pile end can be obviously improved.

[0024] 4. After the carrier construction is completed, the prefabricated pile body is re-punched to reach the hammering standard, which can further reduce the risk of pile end settlement.

[0025] 5. Since the bottom guide protection pile tip sidewall is provided with a plurality of extrusion holes and an inverted tooth rack, the mixed material can enter the peripheral soil and form a whole with the pile end carrier through the extrusion holes, so that the inverted tooth rack extends into the pile end carrier to realize anti-pulling connection, and has excellent anti-pulling performance.

[0026] 6. The impact body is adopted, the ramming and expanding rod directly contacts the mixed material, the pressure control is more accurate, the ramming and expanding rod is provided with a scale, and the position reached by the ramming and expanding rod and the accurate feeding control can be accurately determined.

[0027] 7. The setting of the guide pipe avoids the direct contact between the ramming and expanding rod and the inner wall of the prefabricated pile, and overcomes the problem that the existing ramming and expanding rod is easy to touch the inner wall of the prefabricated pile and cause damage to the prefabricated pile. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the overall structure schematic view of example 1;

[0029] Figure 2 It is the three-dimensional structure schematic view of the sealing plate;

[0030] Figure 3 A three-dimensional structural diagram of the bottom guide protection pile tip;

[0031] Figure 4 A diagram of a precast pile end carrier compaction and expansion device for installing a hydraulic puller;

[0032] Figure 5 This is a schematic diagram of the hydraulic lever puller in Example 2. Detailed implementation method:

[0033] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0034] Example 1

[0035] like Figures 1-3 The device shown is a precast pile end carrier ramming and expansion device, including a precast pile 1, a feeding guide device 2, a bottom guide protection pile tip 3, a guide pipe 4, a ramming and expansion rod 5, a sealing plate 6, a pin block 8, a guide block 9, a guide inclined surface 10, a flange 11, a toothed rack 12, a material extrusion hole 13, a U-shaped material guide groove 14, and a stiffening plate 15.

[0036] Among them, the precast piles in this utility model include, but are not limited to, precast concrete square piles, precast concrete pipe piles, prestressed concrete square piles, prestressed concrete pipe piles, prestressed (ultra) high-strength concrete square piles, prestressed (ultra) high-strength concrete pipe piles, steel pipe piles, etc.

[0037] The top of the precast pile 1 is fixed with a feeding guide device 2, and the bottom is fixed with a bottom guide protection pile tip 3. The top guide sleeve 2 and the bottom guide protection pile tip 3 are both formed with a guide pipe 4 extending into the inside of the precast pile 1, and the guide pipe 4 is in sliding connection with a ramming and expanding rod 5. The feeding guide device 2 and the bottom guide protection pile tip 3 are both fixed with a flange plate 11. The flange plate 11 of the feeding guide device 2 is fixedly connected with the end face of the top end of the precast pile 1 through bolts, and the flange plate 11 of the bottom guide protection pile tip 3 is welded with the end face of the bottom end of the precast pile 1. The outer side wall of the bottom guide protection pile tip 3 is fixed with a plurality of reverse tooth racks 12 in the circumferential direction, and a plurality of extrusion holes 13 are formed in the circumferential direction on the side wall of the bottom guide protection pile tip 3. The top of the feeding guide device 2 is fixed with a U-shaped guide chute 14 on one side, and a plurality of stiffening plates 15 are fixed on the side wall of the feeding guide device 2 in the circumferential direction. The bottom of the bottom guide protection pile tip 3 is provided with an end plate 6, and the top surface of the end plate 6 is formed with a plurality of plug blocks 8 inserted into the bottom of the precast pile 1 and in interference fit with the bottom guide protection pile tip 3 in the circumferential direction. The top surface of the end plate 6 is also fixed with a guide block 9, and the inner end of the guide block 9 is formed with a guide inclined surface 10. The guide inclined surface 10 is located at the middle position of the end plate 6.

[0038] The use method of the precast pile end carrier ramming and expanding device includes the following steps:

[0039] The bottom guide protection pile tip 3 is welded and fixed at the bottom of the precast pile 1, and the end plate 6 is installed at the bottom of the bottom guide protection pile tip 3. Then, the precast pile 1 is driven into the ground to a predetermined depth by using a striking body. The striking body includes a hydraulic hammer and a diesel hammer.

[0040] Step two, fix the feeding guide device 2 on the top of the precast pile 1, and then make the ramming and expanding rod 5 extend into the pile cap of the striking body, and then make the ramming and expanding rod 5 extend into the precast pile 1 and strike downward. When the hydraulic hammer drives the ramming and expanding rod 5 to press, it strikes the end plate 6. Under the guidance of the guide inclined surface 10, the end plate 6 will move downward and to one side, so as to separate from the precast pile 1, and no longer hinder the downward movement of the ramming and expanding rod 5, so that the end plate 6 does not need to be broken before hammering the soil, and it can also prevent the end plate from separating from the precast pile 1 and causing deformation or damage to the bottom of the precast pile 1.

[0041] The ramming and expanding rod 5 continues to be driven downward to form a pit body, and the distance from the bottom to the bottom of the precast pile 1 is h, which is greater than the diameter of the precast pile 1, thereby forming a precast pile end carrier with sufficient supporting force.

[0042] Step three, the winch lifting system on the striking body pulls the ramming and expanding rod 5 out of the precast pile 1, and then adds the mixed material to the pit body through the feeding guide device 2 until the mixed material reaches the position between the top and the bottom of the guide pipe 4 into which the bottom guide protection pile tip 3 extends into the precast pile 1, and the striking body strikes the striking surface on the top of the ramming and expanding rod 5 inserted into the pile cap of the striking body by the striking hammer, so that the ramming and expanding rod 5 strikes the mixed material according to the preset striking force, wherein the ramming and expanding rod 5 does not extend below the bottom of the pit body and does not exceed the top of the guide pipe 4 into which the bottom guide protection pile tip 3 extends into the precast pile 1 when striking the mixed material;

[0043] Step four, repeat step three until the mixed material reaches the bottom of the pile body after being struck to reach the preset penetration standard requirement, forming a precast pile end carrier; wherein after each time the mixed material is poured, the ramming and expanding rod 5 strikes the mixed material to reach the preset penetration standard requirement or the position reached by the ramming and expanding rod 5 last time, so that the mixed material is rammed and extruded in sections and batches, and the precast pile end carrier is gradually formed; the penetration is controlled and read by the scale line on the ramming and expanding rod;

[0044] Step five, the ramming and expanding rod 5 is completely removed and the feeding guide device 2 is removed, and the striking body strikes the precast pile 1 until the precast pile reaches the hammering receiving standard (such as 2cm / 10 strikes).

[0045] Example 2

[0046] As shown in Figure 4 and Figure 5 Example 2 is based on Example 1, the hydraulic rod puller 7 is as follows: including a sleeve body 71, a slip 74 with gradually increasing thickness from bottom to top is installed on the top of the sleeve body 71 in the circumferential direction, a sleeve ring 73 is sleeved on the outer periphery of the upper part of the sleeve body 71, a telescopic rod 72 is fixedly connected to the bottom of the sleeve body 71, and the top of the telescopic rod 72 is connected with the sleeve ring 73; the inner surface of the sleeve ring 73 is arranged in close contact with the outer surface of the slip 74.

[0047] In this way, the slip 74 can be clamped tightly by pushing the sleeve ring 73, so as to tightly hold the ramming and expanding rod 5, and then continue to pull the ramming and expanding rod 5 upward by a distance, so as to realize the action of first pulling the ramming and expanding rod 5 upward by a preset distance by the hydraulic rod puller 7, and then pulling the ramming and expanding rod 5 out of the precast pile 1 by the winch lifting system on the striking body.

[0048] The above embodiment is only one specific embodiment of the present application, and is not intended to limit the present application, and any simple improvement and replacement thereof is within the protection scope of the present application.

Claims

1. A precast pile tip carrier ramming expansion device, characterized by, The utility model provides a precast pile (1), a feeding guide device (2) for feeding mixed material to the precast pile, a bottom guide protection pile tip (3) fixed to the bottom of the precast pile and a ramming rod (5) for extruding mixed material, the bottom of the ramming rod (5) is conical, the feeding guide device (2) and the bottom guide protection pile tip (3) are both formed with a guide pipe (4) extending into the inside of the precast pile (1), and the bottom of the bottom guide protection pile tip is detachably connected with a sealing plate (6).

2. A precast pile tip carrier compaction device as claimed in claim 1, wherein, The side wall of the bottom guide protection pile tip (3) is formed with a plurality of extrusion holes (13).

3. A precast pile tip carrier compaction device as claimed in claim 1, wherein, The top surface of the sealing plate (6) is circumferentially formed with a plurality of plug blocks (8) inserted into the bottom of the precast pile (1) and in interference fit with the bottom guide protection pile tip (3), and the top surface of the sealing plate (6) is also fixed with a guide block (9), the inner end of the guide block (9) is formed with a guide inclined surface (10), and the guide inclined surface (10) is located at the middle position of the sealing plate (6).

4. A precast pile tip carrier compaction device as claimed in claim 1, wherein, The flanges (11) are fixed on the feeding guide device (2) and the bottom guide protection pile tip (3), the flange (11) of the feeding guide device (2) is fixedly connected with the end surface at the top end of the precast pile (1) through bolts, and the flange (11) of the bottom guide protection pile tip (3) is fixedly connected with the end surface at the bottom end of the precast pile (1).

5. A precast pile tip carrier compaction device as claimed in claim 1, wherein, A hydraulic rod puller (7) for pulling up the ramming rod (5) is fixed above the feeding guide device (2), and the ramming rod (5) is marked with a scale.

6. A precast pile tip carrier compaction device as claimed in claim 5, wherein, The hydraulic rod puller (7) comprises a sleeve body (71), the top of the sleeve body (71) is circumferentially mounted with a slip (74) with gradually increasing thickness from bottom to top, a sleeve ring (73) is sleeved on the outer periphery of the upper part of the sleeve body (71), a telescopic rod (72) is fixedly connected to the bottom of the sleeve body (71), the top of the telescopic rod (72) is connected with the sleeve ring (73), and the inner surface of the sleeve ring (73) is arranged in close contact with the outer surface of the slip (74).

7. A precast pile tip carrier compaction device as claimed in claim 6, wherein, The telescopic rod (72) is an oil cylinder, a gas cylinder or an electric cylinder.

8. A precast pile tip carrier compaction device as claimed in claim 1, wherein, A plurality of vertical inverted toothed racks (12) are fixed on the outer side wall of the bottom guide protection pile tip (3) in a circumferential direction.

9. A precast pile tip carrier compaction device as claimed in claim 1, wherein, A U-shaped guide chute (14) is fixed on one side of the top of the feeding guide device (2), and a plurality of stiffening plates (15) are fixed on the side wall of the feeding guide device (2) in a circumferential direction.

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