Novel pile tip door of large-diameter gravel pile

Abstract

The utility model relates to a novel pile tip door for a large-diameter gravel pile, and belongs to the technical field of soft soil foundation gravel pile treatment equipment, the novel pile tip door comprises a steel pipe, clamping plates located outside the steel pipe, and a pile tip and a door plate which are located on the clamping plates, and a connecting structure is arranged between the two clamping plates; the connecting structure comprises a mounting pipe fixedly mounted on the inner wall of the clamping plate, connecting shafts in threaded connection with the mounting pipe and a hinge shaft rotationally connected between the two connecting shafts. According to the novel pile tip door for the large-diameter gravel pile, the clamping plates are rotatably connected relative to the connecting shaft, and the hinge shaft and the connecting plate are connected through the shaft sleeve, so that when the distance between the two clamping plates is changed, different door plates are selected to be matched with the splicing plates for connection; and in addition, the sliding plate and the pile tip are movable, so that the direction of the pile tip can be adjusted for use, and the practicability of the device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of soft soil foundation gravel pile processing equipment, in particular to a new type of pile tip door for a large-diameter gravel pile. Background Art

[0002] Gravel piles, also known as coarse-grained soil piles, are piles that are made by drilling holes in soft soil foundations using methods such as vibratory pipe sinking and vibro-impacting, and then squeezing gravel into the holes to form a cylindrical or nearly cylindrical dense pile body made of gravel.

[0003] Gravel pile technology has begun to be used in the reinforcement of soft soil layers, and has gradually developed into a means of reinforcing soft soil foundations such as railways, highways, municipal and port projects. The commonly used diameters of gravel piles for vibrating pipe sinking are 300mm, 400mm and 500mm. The commonly used pile tip gates for gravel piles in onshore construction are mostly 6-petal and 8-petal multi-petal pointed pile tip gates. After the gravel pile is in place and centered, it is necessary for operators to clamp and fix the 6-petal or 8-petal pointed pile tip gates before vibrating and sinking into the soil to reduce the soil from entering the sinking tube and the damage to the pile tip petals during vibration and sinking. The reinforcement depth of soft soil foundations in the reclamation area is large, up to 40m. If gravel piles with commonly used pile diameters are used to reinforce large-area soft soil foundations, the construction efficiency will be significantly reduced.

[0004] At present, the prior art has a pile tip door device for large diameter gravel piles. After searching the utility model with the announcement number CN209099352U, an automatic opening and closing valve pile tip includes a pile tip tube body, a left leaf petal, a right leaf petal and two blade feet; the two blade feet are respectively connected to the opposite sides of the outer surface of the pile tip tube body. The utility model has a delicate and reliable structure, can be used repeatedly, has good anti-seepage performance, can automatically open and close the lower end of the pile tip tube body, is easy to use, improves work efficiency and reduces costs.

[0005] The leaf structure used in the above application, that is, the existing door panel, can close automatically due to soil pressure during the sinking process. In the reinforcement of large-area soft soil foundations, the use of large-diameter gravel piles has obvious reinforcement effects. In view of the change in pile diameter, it is necessary to separately configure a pile tip door, which increases the design cost. Therefore, a new type of pile tip door for large-diameter gravel piles is proposed to solve the above-mentioned problems. Utility Model Content

[0006] In view of the deficiencies in the prior art, the present application provides a new type of pile tip gate for a large-diameter gravel pile, which has the advantages of being able to adaptively adjust to suit steel pipes of different diameters.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a new type of pile tip door for a large-diameter gravel pile, comprising a steel pipe, a clamping plate located outside the steel pipe, a pile tip head located on the clamping plate, and a door plate, wherein a connecting structure is provided between two of the clamping plates;

[0008] The connection structure includes a mounting tube fixedly mounted on the inner wall of the clamping plate, a connecting shaft threadedly connected to the mounting tube, and an articulated shaft rotatably connected between the two connecting shafts, wherein both ends of the articulated shaft are rotatably connected to the connecting shafts.

[0009] Furthermore, reinforcing ribs are welded on the outer side wall of the door panel, and the reinforcing ribs are arranged in an I-shape on the outer side of the door panel.

[0010] Furthermore, a locking nut is threadedly mounted on the outside of the connecting shaft, and the outer diameter of the locking nut is larger than the mounting tube.

[0011] Furthermore, a shaft sleeve is rotatably mounted on the outside of the hinge shaft, and a splicing plate is fixedly mounted on the outside of the shaft sleeve.

[0012] Furthermore, a connecting plate is extended from the top end surface of the splicing plate toward both sides, and the connecting plate is embedded in a recess at the end of the door panel and is tightened by bolts.

[0013] Furthermore, a slide plate is fixedly mounted on the lower ends of the two clamping plates, and the pile tip slides relative to the slide plate.

[0014] Furthermore, a connecting rib is fixedly installed between the pointed head and the hinge shaft.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] The new type of pile tip door for large-diameter gravel piles is rotatably connected relative to the connecting shaft by setting a clamping plate, and is connected to each other through a hinged shaft and a connecting plate through a shaft sleeve. When the distance between the two clamping plates is changed, different door panels are selected to be adapted to the splicing plates for connection, so as to ensure that different steel pipes can be adapted for on-site welding. In addition, the sliding plate and pile tip are movable, so that the pile tip can be adjusted in position for use, thereby improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of this application;

[0018] Figure 2 This is a three-dimensional diagram of the structure of the pile tip of this application;

[0019] Figure 3 This is a schematic diagram of the top view of the connecting part of the door panel of the present application;

[0020] Figure 4 This is a schematic diagram of the structure after the door panel of this application is opened.

[0021] In the figure: 1. Steel pipe; 2. Clamping plate; 3. Door panel; 4. Reinforcing rib; 5. Mounting pipe; 6. Locking nut; 7. Connecting shaft; 8. Articulated shaft; 9. Bushing; 10. Splicing plate; 11. Connecting plate; 12. Bolt; 13. Slide plate; 14. Pile tip; 15. Connecting rib. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] See also Figure 1-4 A new type of pile tip door for a large-diameter gravel pile in this embodiment includes a steel pipe 1, a clamping plate 2 located outside the steel pipe 1, a pile tip head 14 located on the clamping plate 2, and a door plate 3, wherein there are two clamping plates 2 located on both sides of the steel pipe 1, and the steel pipe 1 and the clamping plates 2 are welded to each other to enhance the installation stability of the clamping plates 2.

[0024] In the utility model, a connection structure is provided between the two clamping plates 2 for hingedly connecting the door panel 3. Since both sides of the steel pipe 1 are obliquely cut into arc surfaces, the arc-shaped door panel 3 can be rotated relative to the connection structure and fit together with the oblique cut surfaces of the steel pipe 1. The pressure of the soil on the door panel 3 during the sinking process makes the door panel 3 and the steel pipe 1 fit more closely, thereby reducing the amount of soil squeezed into the steel pipe 1.

[0025] The main purpose of using vibrating stone piles to reinforce soft soil foundation is to improve the bearing capacity of the foundation soil, reduce deformation and enhance resistance to liquefaction. The mechanism of using stone piles to reinforce soft soil foundation to resist liquefaction mainly has three aspects:

[0026] 1. Densification effect

[0027] During the pile-making process, the pile pipe exerts a large lateral squeezing force on the surrounding sand layer. The gravel in the pile pipe volume squeezes into the stratum around the pile pipe, which reduces the porosity and increases the density of the stratum around the pile pipe.

[0028] 2. Drainage and pressure reduction

[0029] When gravel piles are used to reinforce sandy soil, the pile holes are filled with gravel and other coarse granular materials with good filterability, forming an artificial vertical drainage and pressure-reducing channel with good permeability in the foundation. This can effectively dissipate and prevent the increase of excess pore water pressure, prevent liquefaction of soft soil, and accelerate the drainage and consolidation of the foundation.

[0030] 3. Pre-shock effect

[0031] When drilling and piling gravel piles, the strong vibration of the vibrating hammer makes the filling material and foundation soil obtain strong pre-vibration while compacting, which is extremely beneficial to enhance the anti-liquefaction ability of soft soil. The composite soil layer acts as a cushion layer, which diffuses the load and makes the stress distribution uniform, thereby improving the overall bearing capacity of the foundation and reducing the settlement.

[0032] Preferably, reinforcing ribs 4 are welded on the outer side wall of the door panel 3 , and the reinforcing ribs 4 are arranged in an I-shape on the outer side of the door panel 3 , so that the pressure bearing capacity of the door panel 3 is improved.

[0033] In one embodiment, the connection structure includes a mounting tube 5 fixedly mounted on the inner wall of the clamping plate 2, a connecting shaft 7 threadedly connected to the mounting tube 5, and a hinge shaft 8 rotatably connected between the two connecting shafts 7, wherein both ends of the hinge shaft 8 are rotatably connected to the connecting shafts 7 respectively to facilitate rotational adjustment of the connecting shaft 7.

[0034] Preferably, a locking nut 6 is threadedly mounted on the outside of the connecting shaft 7 , and the outer diameter of the locking nut 6 is larger than the mounting tube 5 .

[0035] With such a design, the movement of the connecting shaft 7 relative to the mounting tube 5 can be restricted by the locking nut 6 rotating to abut against the mounting tube 5 .

[0036] It should be noted that a sleeve 9 is rotatably mounted on the outside of the hinge shaft 8, and a splicing plate 10 is fixedly mounted on the outside of the sleeve 9. The splicing plate 10 is rectangular and is used to splice door panels 3 of different sizes, thereby changing the adaptability to steel pipes 1 of different diameters.

[0037] By rotating the shaft sleeve 9 relative to the hinge shaft 8, it is ensured that the door panel 3 can be opened automatically and smoothly when the pile is pulled up after being vibrated to the designed pile tip elevation, and the gravel in the steel pipe 1 can fall smoothly under the action of its own weight. When reversely inserted, the door panel 3 and the pile tip 14 effectively squeeze the gravel into the soil to form a denser gravel pile body, thereby ensuring the quality of the gravel pile project.

[0038] Specifically, the top end surface of the splicing plate 10 extends out a connecting plate 11 toward both sides, the connecting plate 11 is embedded in the recess at the end of the door panel 3, and is tightened by bolts 12, or the connection can be completed by welding.

[0039] In this embodiment, a slide plate 13 is fixedly mounted on the lower ends of the two clamping plates 2 , and the pile tip 14 slides relative to the slide plate 13 .

[0040] Such a design enables the pile tip 14 to change position along with the clamping plates 2 after the two clamping plates 2 move relative to each other.

[0041] Preferably, a connecting rib 15 is fixedly installed between the pile tip 14 and the hinge shaft 8 , and the connection is made via the connecting rib 15 , so as to maintain the pile tip 14 in the middle of the steel pipe 1 .

[0042] The implementation method of the new type of pile tip door of the large diameter gravel pile of the utility model is as follows according to the recommended construction process steps:

[0043] Step 1: Move the gravel pile equipment to the gravel pile construction site and align the rotating tip with the center of the gravel pile.

[0044] Step 2: Adjust the steel pipe 1 so that the tip of the pile is about 10 cm away from the ground. The door panel 3 is now in the open state under the action of its own gravity.

[0045] Step 3: Adjust the verticality of the gravel pile equipment column and steel pipe 1 again to meet the design requirements.

[0046] Step 4: Slowly release the main winch of the gravel pile equipment, so that the pile tip slowly inserts into the soil, and the door panel 3 gradually closes under the reverse thrust of the soil.

[0047] Step 5: Start the vibrating hammer of the gravel pile equipment to gradually vibrate and sink the steel pipe 1 to the designed elevation.

[0048] Step 6: Pour gravel into the steel pipe 1 for the first time, insert it 20 cm backwards, start the main winch to slowly lift the steel pipe 1, and the pile tip door plate 3 will open under the action of the gravel gravity.

[0049] Step 7: When the main winch is lifting the steel pipe 1 , the subsequent gravel filling is completed and reverse insertion is performed as appropriate, so that the gravel pile body is more compacted under the squeezing action of the pile tip and the door panel 3 .

[0050] Step 8: Pull out the pile tip and clean the soil at the pile tip. The construction of the gravel pile is completed.

[0051] The working principle of the above embodiment is:

[0052] The two clamping plates 2 are welded to the two sides of the bottom end of the vibrating and sinking steel pipe 1, and the position of the hinge shaft 8 relative to the mounting tube 5 is adjusted by rotating the connecting shaft 7. Then, the position of the hinge shaft 8 is fixed by rotating the locking nut 6. When the vibrating and sinking steel pipe 1 is pressed down, pressure is applied to the door panel 3 through the soil, so that the door panel 3 rotates relative to the hinge shaft 8 through the splicing plate 10. At the same time, the door panel 3 fits the cut edge of the vibrating and sinking steel pipe 1. When the vibrating and sinking steel pipe 1 is lifted, the gravel in the steel pipe 1 pushes the door panel 3 to rotate and open under the action of its own weight, so that it can fall smoothly.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A new type of pile tip door for a large diameter gravel pile, comprising a steel pipe (1), a clamping plate (2) located outside the steel pipe (1), a pile tip head (14) located on the clamping plate (2) and a door plate (3), characterized in that: A connecting structure is provided between the two clamping plates (2); The connection structure comprises a mounting tube (5) fixedly mounted on the inner wall of the clamping plate (2), a connecting shaft (7) threadedly connected to the mounting tube (5), and a hinge shaft (8) rotatably connected between the two connecting shafts (7), wherein both ends of the hinge shaft (8) are rotatably connected to the connecting shafts (7) respectively.

2. The novel large diameter gravel pile tip door according to claim 1 is characterized by: A reinforcing rib (4) is also welded to the outer side wall of the door panel (3), and the reinforcing rib (4) is arranged in an I-shape on the outer side of the door panel (3).

3. The novel large diameter gravel pile tip door according to claim 1 is characterized by: A locking nut (6) is also threadedly mounted on the outside of the connecting shaft (7), and the outer diameter of the locking nut (6) is greater than that of the mounting tube (5).

4. The novel large diameter gravel pile tip door according to claim 1 is characterized by: A shaft sleeve (9) is rotatably mounted on the outside of the hinge shaft (8), and a splicing plate (10) is fixedly mounted on the outside of the shaft sleeve (9).

5. The novel large diameter gravel pile tip door according to claim 4 is characterized by: The top end surface of the splicing plate (10) extends toward both sides to form a connecting plate (11), and the connecting plate (11) is embedded in a recess at the end of the door panel (3) and is tightened by bolts (12).

6. The novel large diameter gravel pile tip door according to claim 1 is characterized by: A slide plate (13) is also fixedly mounted on the lower ends of the two clamping plates (2), and the pile tip (14) slides relative to the slide plate (13).

7. The novel large diameter gravel pile tip door according to claim 1 is characterized by: A connecting rib (15) is also fixedly installed between the pile tip (14) and the hinge shaft (8).

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