Cast-in-situ bored pile casing

Abstract

The utility model relates to the technical field of cast-in-place pile construction, in particular to a cast-in-place bored pile casing. A cast-in-situ bored pile casing comprises an upper supporting cylinder and a lower supporting cylinder which are connected in series, a connecting assembly is arranged between the upper supporting cylinder and the lower supporting cylinder and comprises an installation ring and a connecting rod, the installation ring is arranged on the top face of the lower supporting cylinder, an installation groove is formed in the bottom face of the upper supporting cylinder, the installation ring is inserted into the installation groove, and a containing groove is formed in the installation groove. The connecting rod is rotationally arranged in the accommodating groove, and the rotating axis of the connecting rod is horizontal and perpendicular to the radial direction of the mounting ring; one end of the connecting rod extends out of the accommodating groove; and a clamping groove corresponding to the accommodating groove is formed in the side wall of the mounting ring. The upper supporting barrel and the lower supporting barrel can be embedded respectively, but can be pulled out together at a time when pulled out, and the operation is simple and fast.

Description

Technical Field

[0001] The present application relates to the technical field of bored pile construction, and in particular to a bored pile casing. Background Art

[0002] In bored piles, steel casings are often buried to locate the piles to be drilled. During the process of rotary excavation of bored piles, due to the instability of the soil, it is difficult to construct reinforced concrete retaining walls, so steel retaining walls are used to protect the bored piles to prevent the hole from collapsing and to avoid affecting the construction progress and safety.

[0003] At present, the steel casing of bored piles basically adopts the form of integrally buried steel casing or segmented connection. The Chinese patent with application number 202321021123.4 discloses a bored pile steel casing, which includes a connecting mechanism connecting two casing segments, the connecting mechanism includes a hoop-shaped connector, and a groove structure provided on the side walls of the two casing segments for accommodating the hoop-shaped connector, the hoop-shaped connector is arranged around the connection of the two casing segments, and the hoop-shaped connector is accommodated in the groove structure of the two casing segments; the hoop-shaped connector is provided with an open end, and the hoop-shaped connector can be unfolded and closed at the open end, and the hoop-shaped connector is provided with a locking structure at the open end; a fastening structure is provided between the hoop-shaped connector and the groove structure. This application can improve the connection stability of the two casing segments by the engagement of the hoop-shaped connector and the groove structure of the two casing segments, and the fastening structure further strengthens the fixation between the hoop-shaped connector and the groove structure.

[0004] With respect to the above-mentioned related technologies, the applicant believes that the main purpose of connecting the two casing sections is to enable the lower casing to be pulled out through the upper casing when the casing is pulled out. However, in the above-mentioned related technologies, the connection of the two casing sections needs to be completed before burying, so the casing is buried in a longer state, and the operational requirements for the burying operation are also correspondingly higher. Utility Model Content

[0005] In order to facilitate the embedding of the casing, the present application provides a bored cast-in-place pile casing, which adopts the following technical solution.

[0006] A bored pile casing comprises an upper supporting casing and a lower supporting casing connected in series, a connecting assembly is arranged between the upper supporting casing and the lower supporting casing, the connecting assembly comprises a mounting ring and a connecting rod, the mounting ring is arranged on the top surface of the lower supporting casing, a mounting groove is provided on the bottom surface of the upper supporting casing, the mounting ring is inserted into the mounting groove, a receiving groove is provided in the mounting groove, the connecting rod is rotatably arranged in the receiving groove, and the rotation axis of the connecting rod is horizontal and perpendicular to the radial direction of the mounting ring; one end of the connecting rod extends outside the receiving groove; a clamping groove corresponding to the receiving groove is provided on the side wall of the mounting ring.

[0007] By adopting the above technical solution, when there is no external force, under the action of gravity, the connecting rod abuts against the bottom wall of the receiving groove and is in a horizontal state. During construction, the lower supporting tube is first inserted into the soil, and then the upper supporting tube is lifted so that the installation ring is aligned with the installation groove, and the upper supporting tube is moved downward. During the movement, the installation ring contacts the connecting rod, and as the movement continues, the installation ring pushes the connecting rod to rotate upward until the connecting rod is completely located in the receiving groove, and then continues to move, because the connecting rod is always located in the receiving groove due to the extrusion of the installation ring. When the clamping groove is aligned with the receiving groove, the connection rod is lost. Under the action of gravity, the connecting rod rotates downward, so that one end of the connecting rod is located in the clamping groove. After the upper and lower supporting tubes are buried in place, the outer sides of the upper and lower supporting tubes are backfilled and compacted with clay to prevent water leakage around the casing. The installation is completed, which is simple and quick, and the upper and lower supporting tubes are buried separately, which is simple to operate.

[0008] When it is necessary to pull out the casing, pull the upper supporting casing upward, and the upper supporting casing drives the connecting rod to move upward until the connecting rod abuts against the side wall of the clamping groove. As the upper supporting casing continues to move, the lower supporting casing also moves upward under the action of the connecting rod until both the upper supporting casing and the lower supporting casing are pulled out.

[0009] Furthermore, the connection components are arranged in multiple groups along the circumference of the mounting ring.

[0010] By adopting the above technical solution, multiple groups of circumferential connecting components enable the upper supporting tube and the lower supporting tube to have multiple force application points in the circumferential direction during the extraction process, thereby improving the stability of the connection between the upper supporting tube and the lower supporting tube and ensuring that the lower supporting tube can be smoothly extracted.

[0011] Furthermore, at least two groups of the connection components are arranged along the axial direction of the mounting ring.

[0012] By adopting the above technical solution, the connection point between the upper supporting tube and the lower supporting tube is increased in the vertical direction, the stability of the connection between the upper supporting tube and the lower supporting tube is improved, and it is ensured that the lower supporting tube can be smoothly pulled out.

[0013] Furthermore, the upper and lower connecting components along the axial direction of the mounting ring are staggered in the circumferential direction of the mounting ring.

[0014] According to the movement direction of the upper supporting tube, in the vertical direction, the lower connecting assembly first moves to the upper clamping groove, in order to prevent the lower connecting rod from entering the upper clamping groove and prevent the upper supporting tube from moving further downward. By adopting the above technical solution, the upper and lower connecting assemblies are staggered to ensure that the connecting rod enters the corresponding clamping groove, ensuring smooth installation.

[0015] Furthermore, the areas of the sides of the connecting rods of the upper and lower connecting assemblies along the axial direction of the mounting ring are different near the mounting ring, the side area of ​​the lower connecting rod is larger than the area of ​​the upper connecting rod, and the cross-section of the clamping groove is adapted to the connecting rod.

[0016] According to the movement direction of the upper supporting tube, in the vertical direction, the lower connecting assembly first moves to the upper clamping groove, in order to prevent the lower connecting rod from entering the upper clamping groove, and prevent the upper supporting tube from moving further downward. By adopting the above technical solution, due to the difference in the size of the cross-sectional area, the lower connecting rod cannot enter the upper clamping groove, ensuring that the connecting rod enters the corresponding clamping groove, ensuring smooth installation.

[0017] Furthermore, a first inclined surface is provided on one side of the connecting rod close to the mounting ring, and the first inclined surface gradually extends from bottom to top towards the mounting ring; a second inclined surface parallel to the first inclined surface is provided on the top of the mounting ring.

[0018] By adopting the above technical solution, during the movement of the upper supporting tube, the first inclined surface cooperates with the second inclined surface to play a guiding role, ensuring that the connecting rod rotates under the pushing action of the mounting ring.

[0019] Furthermore, a rotating rod is rotatably provided on the side of the connecting rod close to the mounting ring, and the rotating axis of the rotating rod is parallel to the rotating axis of the connecting rod.

[0020] By adopting the above technical solution, the setting of the rotating rod converts the sliding friction between the connecting rod and the mounting ring into rolling friction, so that after the accommodating groove is aligned with the clamping groove, the connecting rod can be smoothly reset under the action of gravity.

[0021] Furthermore, an elastic sheet is provided in the accommodating groove, and when the connecting rod is rotated into the accommodating groove, the free end of the elastic sheet can abut against the elastic sheet and drive the connecting rod to reset.

[0022] By adopting the above technical solution, the connecting rod gradually squeezes the elastic sheet during the process of rotating upward under the push of the installation ring, and the elastic sheet stores energy. When the accommodating groove is aligned with the clamping groove, the elastic sheet recovers its deformation and drives the connecting rod to reset.

[0023] Furthermore, a positioning block is provided on the inner wall of the installation groove, and a positioning groove is provided on the installation ring, and the positioning block can slide in the positioning groove.

[0024] By adopting the above technical solution, when installing the upper support tube, the positioning block is aligned with the positioning groove to ensure that the accommodating groove can be aligned with the corresponding clamping groove, thereby ensuring that the connecting rod can enter the clamping groove.

[0025] In summary, this application has the following beneficial effects:

[0026] During construction, first insert the lower supporting tube into the soil, then lift the upper supporting tube so that the installation ring is aligned with the installation groove, move the upper supporting tube downward, and the installation ring pushes the connecting rod to rotate upward. When the clamping groove is aligned with the receiving groove, the connecting rod rotates downward under the action of gravity so that one end of the connecting rod is located in the clamping groove, and the insertion work is completed. When the casing needs to be pulled out, pull the upper supporting tube upward, and the upper supporting tube drives the connecting rod to move upward. Under the action of the connecting rod, the lower supporting tube also moves upward until both the upper supporting tube and the lower supporting tube are pulled out. The insertion and installation process of the casing is simple and quick, and the upper supporting tube and the lower supporting tube are buried separately, which is simple to operate. In addition, the upper supporting tube and the lower supporting tube can be pulled out together at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application;

[0028] Figure 2 is a cross-sectional view of Example 1 of the present application;

[0029] Figure 3 Is for Figure 2 A partial enlarged view of point A;

[0030] Figure 4 is a cross-sectional view showing the interior of the receiving groove according to Embodiment 1 of the present application;

[0031] Figure 5 The first embodiment of the present application is a schematic diagram showing the structure of the card slot;

[0032] Figure 6 This is a schematic diagram of the structure of the card slot shown in Example 2 of the present application.

[0033] In the figure, 1, upper supporting tube; 11, mounting groove; 12, accommodating groove; 13, positioning block; 14, elastic sheet; 2, lower supporting tube; 3, connecting assembly; 31, mounting ring; 311, clamping groove; 312, positioning groove; 313, second inclined surface; 32, connecting rod; 321, first inclined surface; 322, rotating rod. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings.

[0035] Embodiment 1

[0036] Reference Figure 1-Figure 3 A bored pile casing comprises an upper casing 1 and a lower casing 2 connected in series, wherein a connecting assembly 3 is arranged between the upper casing 1 and the lower casing 2. The arrangement of the connecting assembly 3 enables the upper casing 1 and the lower casing 2 to be buried separately during embedding, but the upper casing 1 and the lower casing 2 can be pulled out together at one time during extraction, which is simple and quick.

[0037] Reference Figure 3 and Figure 4 , the connecting assembly 3 includes a mounting ring 31 and a connecting rod 32. The mounting ring 31 is fixedly connected to the top surface of the lower supporting tube 2. An annular mounting groove 11 is provided on the bottom surface of the upper supporting tube 1, and the mounting ring 31 is inserted into the mounting groove 11, and the mounting ring 31 completely fills the mounting groove 11. A receiving groove 12 is provided in the mounting groove 11, and the connecting rod 32 is arranged in the receiving groove 12, and the connecting rod 32 is rotatably connected to the upper supporting tube 1, and the rotation axis of the connecting rod 32 is horizontal and perpendicular to the radial direction of the mounting ring 31. One end of the connecting rod 32 extends outside the receiving groove 12; the side wall of the mounting ring 31 is provided with a clamping groove 311 corresponding to the receiving groove 12. Along the circumferential direction of the mounting ring 31, the connecting assembly 3 is provided with a plurality of groups, six groups in this embodiment.

[0038] First, insert the lower supporting tube 2 into the soil, and then align the upper supporting tube 1 with the lower supporting tube 2 so that the mounting ring 31 is inserted into the mounting groove 11. As the upper supporting tube 1 moves downward, the mounting ring 31 pushes the connecting rod 32 to rotate upward so that the connecting rod 32 is completely located in the accommodating groove 12. When the installation groove 11 is moved to align with the clamping groove 311, the connecting rod 32 rotates downward under the action of gravity so that one end of the connecting rod 32 is located in the clamping groove 311, completing the insertion of the upper supporting tube 1 and the lower supporting tube 2. When it is necessary to pull out, pull the upper supporting tube 1 upward, and the upper supporting tube 1 drives the connecting rod 32 to move upward until the connecting rod 32 abuts against the side wall of the clamping groove 311. As the upper supporting tube 1 continues to move, the lower supporting tube 2 also moves upward under the action of the connecting rod 32 until both the upper supporting tube 1 and the lower supporting tube 2 are pulled out.

[0039] Reference Figure 3 and Figure 4 A positioning block 13 is provided on the inner wall of the mounting groove 11, and the bottom surface of the positioning block 13 is coplanar with the bottom surface of the upper support tube 1. A positioning groove 312 is provided on the mounting ring 31, and the positioning groove 312 penetrates the mounting ring 31 along the axial direction. When the support tube 1 is installed, the positioning block 13 is aligned with the positioning groove 312 to ensure that the accommodating groove 12 can be aligned with the corresponding clamping groove 311.

[0040] Reference Figure 3 and Figure 4 A first inclined surface 321 is provided on the side of the connecting rod 32 close to the mounting ring 31, and the first inclined surface 321 gradually extends toward the mounting ring 31 from bottom to top. A second inclined surface 313 parallel to the first inclined surface 321 is provided on the top of the mounting ring 31. During the movement of the upper support tube 1, the first inclined surface 321 gradually abuts against and overlaps with the second inclined surface 313, which plays a guiding role to ensure that the connecting rod 32 rotates under the pushing action of the mounting ring 31.

[0041] Reference Figure 3 and Figure 4 The side of the connecting rod 32 near the mounting ring 31 is provided with an embedding groove, and a rotating rod 322 is arranged in the embedding groove. The rotating rod 322 is rotatably connected to the connecting rod 32, and the rotation axis of the rotating rod 322 is parallel to the rotation axis of the connecting rod 32. The rotation axis of the rotating rod 322 is located in the embedding groove, and part of the circumference of the rotating rod 322 is located outside the embedding groove. The arrangement of the rotating rod 322 reduces the friction between the connecting rod 32 and the mounting ring 31, ensuring that the connecting rod 32 can smoothly rotate downward.

[0042] Reference Figure 3 and Figure 4 , an elastic sheet 14 is fixedly connected in the receiving groove 12. One end of the elastic sheet 14 is fixedly connected to the inner wall of the receiving groove 12 away from the mounting ring 31, and the free end of the elastic sheet 14 extends to cross the rotation axis of the connecting rod 32. The elastic sheet 14 is located above the connecting rod 32. In the process of the connecting rod 32 rotating upward under the action of the mounting ring 31, it does not contact with the elastic sheet 14 in the initial stage of rotation. When it rotates to a certain position, the connecting rod 32 abuts against the elastic sheet 14 and squeezes the elastic sheet 14 to deform the elastic sheet 14. When the clamping groove 311 is aligned with the receiving groove 12, the elastic sheet 14 resets and applies external force to the connecting rod 32, so that the connecting rod 32 obtains the driving force for reset, and then the connecting rod 32 is smoothly reset under the combined action of inertia and gravity.

[0043] Refer to 4 and Figure 5 , along the axial direction of the mounting ring 31, the connecting assembly 3 is provided with at least two groups, and two groups are provided in this embodiment. In the vertical direction, the area of ​​the side of the connecting rod 32 of the upper connecting assembly 3 close to the mounting ring 31 is smaller than the side area of ​​the connecting rod 32 located at the bottom. The cross-sectional area of ​​the upper clamping groove 311 is smaller than the cross-sectional area of ​​the lower clamping groove 311, that is, the connecting rod 32 located at the bottom cannot be inserted into the upper clamping groove 311 but can be inserted into the lower clamping groove 311. Ensure that the connecting rod 32 enters the corresponding clamping groove 311 to ensure smooth installation.

[0044] The implementation principle of a bored pile casing in the embodiment of the present application is as follows: when there is no external force, under the action of gravity, the connecting rod 32 abuts against the bottom wall of the receiving groove 12 and is in a horizontal state.

[0045] During construction, the lower support tube 2 is first inserted into the soil, and then the upper support tube 1 is lifted so that the mounting ring 31 is aligned with the mounting groove 11, and the upper support tube 1 is moved downward. During the movement, the first inclined surface 321 gradually contacts the second inclined surface 313. As the movement continues, the mounting ring 31 pushes the connecting rod 32 to rotate upward, and gradually squeezes the elastic sheet 14, so that the elastic sheet 14 is deformed. Until the connecting rod 32 is completely located in the receiving groove 12, and then continues to move, because the squeezing connecting rod 32 of the mounting ring 31 is always located in the receiving groove 12. When the connecting rod 32 is moved to the point where the clamping groove 311 is aligned with the receiving groove 12, the elastic sheet 14 resets and pushes the connecting rod 32 to move. Under the combined action of gravity and the external force applied by the elastic sheet 14, the connecting rod 32 rotates downward, so that one end of the connecting rod 32 is located in the clamping groove 311. After the upper supporting tube 1 and the lower supporting tube 2 are buried in place, the outer sides of the upper supporting tube 1 and the lower supporting tube 2 are backfilled and compacted with clay to prevent water leakage around the casing.

[0046] When it is necessary to pull out the casing, pull the upper casing 1 upward, and the upper casing 1 drives the connecting rod 32 to move upward until the connecting rod 32 abuts against the side wall of the clamping groove 311. As the upper casing 1 continues to move, under the action of the connecting rod 32, the lower casing 2 also moves upward until both the upper casing 1 and the lower casing 2 are pulled out.

[0047] Embodiment 2

[0048] Reference Figure 6 , which is different from the embodiment 1, the upper connection assembly 3 and the lower connection assembly 3 are staggered in the axial direction of the mounting ring 31. The upper and lower connection assemblies 3 are staggered to prevent the lower connection rod 32 from entering the upper clamping groove 311, and ensure that the connection rod 32 enters the corresponding clamping groove 311, so as to ensure smooth installation.

[0049] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A bored pile casing, characterized in that: The utility model comprises an upper supporting tube (1) and a lower supporting tube (2) connected in series, a connecting assembly (3) is arranged between the upper supporting tube (1) and the lower supporting tube (2), the connecting assembly (3) comprises a mounting ring (31) and a connecting rod (32), the mounting ring (31) is arranged on the top surface of the lower supporting tube (2), a mounting groove (11) is provided on the bottom surface of the upper supporting tube (1), the mounting ring (31) is inserted into the mounting groove (11), a receiving groove (12) is provided in the mounting groove (11), the connecting rod (32) is rotatably arranged in the receiving groove (12), and the rotation axis of the connecting rod (32) is horizontal and perpendicular to the radial direction of the mounting ring (31); one end of the connecting rod (32) extends outside the receiving groove (12); and a clamping groove (311) corresponding to the receiving groove (12) is provided on the side wall of the mounting ring (31).

2. A bored pile casing according to claim 1, characterized in that: The connection components (3) are arranged in multiple groups along the circumference of the mounting ring (31).

3. The bored pile casing according to claim 1, characterized in that: The connection assembly (3) is provided in at least two groups along the axial direction of the mounting ring (31).

4. A bored pile casing according to claim 3, characterized in that: The upper and lower connection components (3) along the axial direction of the mounting ring (31) are staggeredly distributed in the circumferential direction of the mounting ring (31).

5. The bored pile casing according to claim 3, characterized in that: The areas of the sides of the connecting rods (32) of the upper and lower connecting assemblies (3) close to the mounting ring (31) are different along the axial direction of the mounting ring (31), the side area of ​​the connecting rod (32) located at the bottom is larger than the area of ​​the connecting rod (32) located at the top, and the cross section of the clamping groove (311) is adapted to the connecting rod (32).

6. The bored pile casing according to claim 1, characterized in that: A first inclined surface (321) is provided on one side of the connecting rod (32) close to the mounting ring (31), and the first inclined surface (321) gradually extends from bottom to top in a direction close to the mounting ring (31); and a second inclined surface (313) parallel to the first inclined surface (321) is provided on the top of the mounting ring (31).

7. The bored pile casing according to claim 5, characterized in that: A rotating rod (322) is rotatably arranged on the side of the connecting rod (32) close to the mounting ring (31), and the rotating axis of the rotating rod (322) is parallel to the rotating axis of the connecting rod (32).

8. The bored pile casing according to claim 1, characterized in that: An elastic sheet (14) is arranged in the accommodating groove (12); when the connecting rod (32) rotates into the accommodating groove (12), the free end of the elastic sheet (14) can abut against the elastic sheet (14) and drive the connecting rod (32) to reset.

9. The bored pile casing according to claim 1, characterized in that: A positioning block (13) is provided on the inner wall of the installation groove (11), and a positioning groove (312) is provided on the installation ring (31), and the positioning block (13) can slide in the positioning groove (312).

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