Cast-in-situ bored pile foundation pile casing

Abstract

The utility model discloses a cast-in-situ bored pile foundation pile casing, and belongs to the technical field of cast-in-situ piles, the pile casing comprises a top cylinder, a slurry conveying funnel and a plurality of unit cylinder bodies connected end to end, and the adjacent unit cylinder bodies are coaxially connected through connecting rings; external thread sections are arranged at the two ends of each unit barrel; internal thread sections matched with the external thread sections are arranged at the two ends of the connecting ring; the top cylinder is in threaded connection with the top of the topmost unit cylinder body; the inner wall of the upper part of the top cylinder gradually gets close to the axis to form a funnel-shaped passing channel; the slurry conveying funnel is detachably inserted into the top cylinder from the passing channel; the top cylinder can replace the topmost unit cylinder body to bear pressure applied by the outside, and the situation that the external thread section of the topmost unit cylinder body deforms due to external pressure or hammering force, and consequently the protective cylinder is damaged is avoided. The slurry conveying funnel can ensure that the concrete slurry does not deflect in the grouting process, and the concrete slurry is prevented from impacting the pile casing and causing the pile casing to deflect; the device is simple in overall structure and good in reliability.

Description

Technical Field

[0001] The utility model belongs to the technical field of cast-in-place piles, and in particular relates to a bored cast-in-place pile foundation casing. Background Art

[0002] In the construction of bored cast-in-place piles, the steel casing mainly has the functions of fixing the position of the pile mouth, protecting the hole mouth, maintaining the mud water level, preventing hole collapse, controlling the pile top elevation, and preventing the backflow of sediment. It is an important guarantee for the quality of pile construction and plays a vital role in the construction of bored piles.

[0003] The existing cast-in-place piles are generally fixed in length. For deeper pile foundations, multiple pile foundation casings need to be connected to extend the length of the casings. In the existing casing construction, the connection is generally made by welding. This connection method has high technical requirements for welders and is prone to angular deviation between the upper and lower casings due to technical reasons of welders. At the same time, because long casings usually have large pull-out resistance and high bearing capacity requirements for on-site construction sites, the welding time of long casings is long, and the construction period is also longer, which will extend the construction period to a certain extent.

[0004] At present, in the prior art, two casings are connected by thread instead of welding. However, external pressure or hammer force makes the top threaded section of the uppermost casing easily deformed, causing casing damage, and during the grouting process, the casing is easily deflected. Utility Model Content

[0005] The utility model aims at the deficiencies in the prior art and provides a bored cast-in-place pile foundation casing, which has a simple structure and high reliability and can effectively prevent the casing from deflecting.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A bored cast-in-place pile foundation casing comprises: a top cylinder, a grouting funnel and a plurality of unit cylinders connected end to end, wherein adjacent unit cylinders are coaxially connected via a connecting ring so that two adjacent unit cylinders communicate with each other; both ends of the unit cylinders are provided with external thread sections; both ends of the connecting rings are provided with internal thread sections adapted to the external thread sections so that the connecting rings are threadedly connected to the unit cylinders; the top cylinder is threadedly connected to the upper part of the unit cylinder at the top; the upper inner wall of the top cylinder gradually approaches its axis to form a funnel-shaped passage; the grouting funnel is detachably inserted into the top cylinder from the passage.

[0008] Optionally, the outer wall of the slurry conveying funnel is provided with a positioning protrusion or a positioning groove, and the upper inner wall of the top cylinder is provided with a positioning groove or a positioning protrusion, and the positioning groove and the positioning protrusion match each other.

[0009] Optionally, there are a plurality of positioning protrusions and positioning grooves, and the cross-section of the positioning protrusion is one of square, triangle, circle or trapezoid.

[0010] Optionally, both ends of the unit cylinder are also provided with annular protrusions; the annular protrusions are located on the side of the external thread section that is away from the end face of the unit cylinder; a locking ring is also provided on the outer periphery of the connecting ring; when adjacent unit cylinders are connected end to end, the annular protrusions of the two adjacent unit cylinders close to each other and the locking ring located between the two adjacent unit cylinders are connected to each other to form a whole.

[0011] Optionally, it also includes tension bolts, the locking ring is provided with a plurality of first through holes, and the annular protrusion is provided with second through holes adapted to the first through holes; the tension bolts are penetrated through the first through holes and the second through holes and are locked by tension nuts.

[0012] Optionally, the annular protrusion is adjacent to the external thread segment; the annular protrusion is consistent with the outer diameter of the locking ring; and the locking ring and the connecting ring are integrally formed.

[0013] Optionally, it also includes a tail cylinder; the tail cylinder is connected to the lower part of the unit cylinder at the bottom; the tail cylinder decreases from top to bottom to form a blade shape.

[0014] Optionally, the outer wall of the unit cylinder is coated with a corrosion-resistant layer.

[0015] The beneficial effects of the utility model are:

[0016] (1) The present application includes a top cylinder and a grouting funnel. The function of the top cylinder is to replace the topmost unit cylinder to bear the externally applied pressure, so as to prevent the external pressure or hammer force from deforming the external threaded section at the top of the unit cylinder and causing damage to the casing; the function of the grouting funnel is to ensure that the concrete slurry will not deflect during the grouting process, so as to prevent the concrete slurry from impacting the casing and causing the casing to deflect; the present application has a simple overall structure, and uses mechanical connection instead of welding construction, so it has high reliability; the present application connects two adjacent unit cylinders by means of a connecting ring, which effectively ensures the coaxiality of the two unit cylinders and the consistency of the upper and lower parts, thereby preventing the casing from tilting and effectively shortening the construction process and construction period of the casing connection.

[0017] (2) A locking ring is provided outside the connecting ring of the present application, and the locking ring is connected to the annular protrusion of the unit cylinder, thereby further enhancing the connection stability between two adjacent unit cylinders.

[0018] (3) The present application includes a tail cylinder, the function of which is to prevent the external threaded section at the bottom of the bottommost unit cylinder from being damaged by force during the cylinder sinking process. At the same time, the cutter head shape at the bottom of the tail cylinder facilitates the cylinder sinking construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the unit cylinder structure of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a connecting ring of the utility model.

[0022] Markings in the figure are: 1 is a unit cylinder, 2 is a connecting ring, 3 is an external thread section, 4 is an internal thread section, 5 is an annular protrusion, 51 is a second through hole, 6 is a locking ring, 61 is a first through hole, 7 is a tension bolt, 8 is a tail cylinder, 9 is a top cylinder, and 10 is a slurry delivery funnel. DETAILED DESCRIPTION

[0023] The utility model is described in detail below with reference to the accompanying drawings.

[0024] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. used in the utility model are only for the convenience of description and are not used to limit the scope of implementation of the utility model. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the utility model without substantially changing the technical content.

[0025] like Figure 1-Figure 3 As shown, a bored pile foundation casing comprises: a top tube 9, a slurry delivery funnel 10 and a plurality of unit cylinders 1 connected end to end, and adjacent unit cylinders 1 are coaxially connected through a connecting ring 2 so that two adjacent unit cylinders 1 are connected.

[0026] Both ends of the unit cylinder 1 are provided with external thread sections 3; both ends of the connecting ring 2 are provided with internal thread sections 4 adapted to the external thread sections 3, so that the connecting ring 2 is threadedly connected to the unit cylinder 1, that is, for the two unit cylinders 1 distributed up and down, the bottom of the upper unit cylinder 1 is screwed into the upper half of the connecting ring 2, and the upper part of the lower unit cylinder 1 is screwed into the lower half of the connecting ring 2.

[0027] The top cylinder 9 is threadedly connected to the upper part of the topmost unit cylinder 1; the function of the top cylinder 9 is to replace the topmost unit cylinder 1 to bear the external pressure, so as to avoid the external pressure or hammer force causing the external thread section at the top of the unit cylinder 1 to deform and cause damage to the casing.

[0028] The upper inner wall of the top tube 9 gradually approaches its axis to form a funnel-shaped passage; the grouting funnel 10 is inserted into the top tube 9 through a detachable self-passing passage; the function of the grouting funnel 10 is to ensure that the concrete slurry will not deflect during the grouting process, to avoid the concrete slurry impacting the casing and causing the casing to deflect, and to avoid the concrete slurry sticking to the inside of the upper casing, which makes it more difficult to clean and maintain the inside of the upper casing after it is pulled out later.

[0029] Furthermore, the outer wall of the slurry delivery funnel 10 is provided with a positioning protrusion or a positioning groove, and the upper inner wall of the top tube 9 is provided with an adaptive positioning groove or a positioning protrusion, and the positioning protrusion and the positioning groove match each other, that is, if the outer wall of the slurry delivery funnel 10 is provided with a positioning protrusion, then the positioning groove is located on the inner wall of the upper part of the top tube 9; there are multiple positioning protrusions and positioning grooves, and the cross-section of the positioning protrusion is one of square, triangle, circle or trapezoid; the use of the positioning protrusion and the positioning groove can prevent the slurry delivery funnel 10 from rotating or deflecting under the impact of the concrete slurry during the grouting process, thereby effectively increasing the stability of the slurry delivery funnel 10 during the grouting process.

[0030] In some other embodiments, both ends of the unit cylinder 1 are further provided with an annular protrusion 5, the annular protrusion 5 is located on the end face side of the external thread section 3 facing away from the unit cylinder 1, and a locking ring 6 is further provided on the outer periphery of the connecting ring 2; a locking ring 6 is also provided on the outer periphery of the connecting ring 2; when adjacent unit cylinders 1 are connected end to end, the annular protrusions 5 of the two adjacent unit cylinders 1 close to each other and the locking ring 6 located between the two adjacent unit cylinders 1 are connected to each other.

[0031] Specifically, the casing also includes a tension bolt 7, the locking ring 6 is provided with a plurality of first through holes 61, the annular protrusion 5 is provided with a second through hole 51 adapted to the first through hole 61, the second through hole 51 corresponds to the first through hole 61 one by one, and the plurality of first through holes 61 are evenly distributed in an annular shape on the locking ring 6; the tension bolt 7 is penetrated through the first through hole 61 and the second through hole 51 and is locked by a tension nut, and one tension bolt 7 only connects the annular protrusions 5 of two adjacent unit cylinders 1 that are close to each other. The setting of the tension bolt 7 makes the connection between the two adjacent unit cylinders 1 tighter, thereby ensuring the connection stability between the unit cylinders 1.

[0032] More specifically, the annular protrusion 5 borders the external thread section 3; the outer diameter of the annular protrusion 5 is consistent with that of the locking ring 6; the locking ring 6 and the connecting ring 2 are integrally formed; the outer wall of the unit cylinder 1 is coated with a corrosion-resistant layer, and the material of the corrosion-resistant layer can refer to the prior art.

[0033] It is worth noting that the unit cylinders 1 of the present application have the same axial length. In some other embodiments, the casing may also include unit cylinders 1 of various specifications, and the unit cylinders 1 of different specifications have the same radial dimensions but different axial dimensions.

[0034] In some other embodiments, the pile foundation casing also includes a tail cylinder 8; the tail cylinder 8 is connected to the lower part of the unit cylinder 1 at the bottom; the tail cylinder 8 is reduced from top to bottom to form a blade shape; the tail cylinder 8 and the unit cylinder 1 at the bottom are also connected by threads. During the sinking process, the role of the tail cylinder 8 is to prevent the threaded section at the bottom of the unit cylinder 1 from being damaged by the force during the sinking process. At the same time, the blade shape at the bottom of the tail cylinder 8 facilitates the sinking construction.

[0035] The working principle is as follows: before the casing is sunk, the casing length is determined according to the actual pile foundation depth, thereby determining the number of unit cylinders 1; the tail cylinder 8 is connected to the lower thread of the bottom unit cylinder 1, and then the unit cylinder 1 is placed on a horizontal base, and the upper half of the internal thread section 4 of the connecting ring 2 is screwed to the external thread section 3 at the bottom of the unit cylinder 1, so as to connect the connecting ring 2 to the upper unit cylinder 1; then, by rotating the lower unit cylinder 1, the lower unit cylinder 1 is screwed into the lower half of the internal thread section 4 of the connecting ring 2, thereby completing the preliminary connection of the two unit cylinders 1; the horizontal base used in this process can adopt the existing roller cage weaving machine, or it can be made by placing two rollers horizontally separately and then driving them in the form of a pulley through the driving motor at the end;

[0036] For a small number of unit cylinders 1, a preliminary connection can be made by hoisting; after the preliminary connection is completed, the first through hole 61 on the locking ring 6 and the second through hole 51 on the adjacent upper unit cylinder 1 and the lower unit cylinder 1 are aligned, and then the tension bolts 7 are inserted and locked by the tension nuts. On the one hand, the bonding force between the two unit cylinders 1 can be increased, and on the other hand, the unit casing can be prevented from being dislocated due to external pressure during the sinking process, thereby effectively ensuring the integrity of the casing;

[0037] The top cylinder 9 is threadedly connected to the topmost unit cylinder 1 , and the slurry delivery funnel 10 is inserted into the top cylinder 9 .

[0038] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0039] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims

1. A bored pile foundation casing, characterized in that: include: A top cylinder (9), a slurry delivery funnel (10) and a plurality of unit cylinders (1) connected end to end, wherein adjacent unit cylinders (1) are coaxially connected via a connecting ring (2) so that two adjacent unit cylinders (1) communicate with each other; both ends of the unit cylinders (1) are provided with external thread sections (3); both ends of the connecting ring (2) are provided with internal thread sections (4) adapted to the external thread sections (3) so that the connecting ring (2) and the unit cylinders (1) are threadedly connected; the top cylinder (9) is threadedly connected to the upper part of the unit cylinder (1) at the top; the upper inner wall of the top cylinder (9) gradually approaches its axis to form a funnel-shaped passage; the slurry delivery funnel (10) is detachably inserted into the top cylinder (9) from the passage.

2. The bored pile foundation casing according to claim 1, characterized in that: The outer wall of the slurry conveying funnel (10) is provided with a positioning protrusion or a positioning groove, and the upper inner wall of the top cylinder (9) is provided with a positioning groove or a positioning protrusion, and the positioning groove and the positioning protrusion match each other.

3. The bored pile foundation casing according to claim 2, characterized in that: There are a plurality of positioning protrusions and positioning grooves, and the cross section of the positioning protrusion is one of square, triangle, circle or trapezoid.

4. The bored pile foundation casing according to claim 1, characterized in that: Both ends of the unit cylinder (1) are also provided with annular protrusions (5); the annular protrusions (5) are located on the end face side of the external thread section (3) facing away from the unit cylinder (1); a locking ring (6) is also provided on the outer periphery of the connecting ring (2); when adjacent unit cylinders (1) are connected end to end, the annular protrusions (5) of two adjacent unit cylinders (1) close to each other and the locking ring (6) located between the two adjacent unit cylinders (1) are connected to each other to form a whole.

5. The bored pile foundation casing according to claim 4, characterized in that: It also includes a tension bolt (7), the locking ring (6) is provided with a plurality of first through holes (61), and the annular protrusion (5) is provided with a second through hole (51) adapted to the first through hole (61); the tension bolt (7) is locked by a tension nut after passing through the first through hole (61) and the second through hole (51).

6. The bored pile foundation casing according to claim 4, characterized in that: The annular protrusion (5) is adjacent to the external thread section (3); the outer diameter of the annular protrusion (5) is consistent with that of the locking ring (6); and the locking ring (6) and the connecting ring (2) are integrally formed.

7. The bored pile foundation casing according to claim 1, characterized in that: It also comprises a tail cylinder (8); the tail cylinder (8) is connected to the lower part of the unit cylinder (1) at the bottom; the tail cylinder (8) decreases from top to bottom to form a blade shape.

8. The bored pile foundation casing according to claim 1, characterized in that: The outer wall of the unit cylinder (1) is coated with a corrosion-resistant layer.

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