A foundation pit cast-in-situ bored pile with a casing

Abstract

The application discloses a foundation pit cast-in-situ bored pile casing, and relates to the technical field of building foundation equipment. The inner side of the casing main body is provided with a plurality of support frames. The support frame comprises a center block located at the center position. A plurality of equidistantly distributed support rods are connected to the outer side of the center block. A sliding rod is fixed on the support rod. The other end of the sliding rod is provided with a moving rod. A sliding hole is formed in the moving rod. The outer side end of the moving rod is fixed with an arc-shaped support rod. The plurality of support frames provide support to the casing main body from the inner side to prevent the casing main body from deforming. After the support frame is moved upward and separated from the vertical sliding rail, the limiting mechanism is used to release the limitation of the sliding rod and the moving rod. The moving rod is moved along the sliding rod to the direction close to the center block. Then, the support frame can be taken out from the upper end of the casing main body. The strength of the casing can be improved. Moreover, the support frame can be reused in other casings, thereby reducing the cost.

Description

Technical Field

[0001] The invention relates to the technical field of building foundation equipment, in particular to a casing for foundation pit bored cast-in-place piles. Background Art

[0002] Casings are a key device used in bored pile construction to secure the pile position, protect the borehole, and maintain borehole wall stability. Typically constructed of steel or reinforced concrete, they are buried above ground or underwater to form a closed guide structure. Their core functions include isolating surface water and debris to prevent borehole collapse, maintaining the slurry level within the hole to balance soil lateral pressure, and guiding the drill bit vertically to minimize hole deviation. In complex geological conditions (such as soft soils and quicksand) or deepwater operations, casings must be extended or spliced ​​to penetrate deeper into the stable soil. Their diameter is typically 20 to 40 cm larger than the pile diameter, and their wall thickness is determined by geological loading (4 to 12 mm for steel casings and 8 to 10 cm for reinforced concrete casings). During construction, vertical deviation (≤1%) and joint sealing must be strictly controlled to ensure pile foundation quality and structural safety.

[0003] The structural strength of the casing is of vital importance. For example, the casing for bored piles in foundation pits disclosed in patent publication number CN219080300U includes a main body, a support frame is provided in the main body, and the support frame includes a main support rod that fits the inner wall of the main body. A plurality of extended sub-frames are symmetrically provided on the main support rod, and the extended sub-frames fit the inner wall of the main body. The casing for bored piles in foundation pits provided by this utility model has the following advantages: when the main body needs to be removed after pouring concrete, the hook of the crane is hooked on the hook pull ring and then pulled. At this time, the extended sub-frames can play a good supporting role to prevent the main body from being deformed by the pulling force, maintain the cylindrical shape to reduce damage to the soil surface, and facilitate the removal of the main body. A hammer ring and a cutting blade are also provided. When the main body is installed, the hammer ring can be hammered to squeeze the cutting blade into the soil, which facilitates installation while reducing damage to the main body.

[0004] Although the above-mentioned casing provides a reinforced structure, the reinforcement effect is limited by the thickness of the casing wall. When the casing is deep underground, it needs to be hammered and vibrated from above. The part deep underground is supported by the soil and is not easily deformed, but the inside and outside of the part located on the ground have no support. Especially when the casing is long, it is easy to deform during the hammering process. Summary of the Invention

[0005] The object of the present invention is to provide a casing for bored piles in foundation pits to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The utility model provides a kind of caisson for foundation pit bored pile, including caisson main part, the upper end of caisson main part is provided with hammering sleeve, hammering sleeve is covered in the upper edge of caisson main part, the lower end of caisson main part is provided with cut-in, and the inner wall of caisson main part is fixed with several vertical slide rails that are uniformly distributed in circumference, and the lower end of vertical slide rail is provided with sharp head, the inside of caisson main part is provided with multiple support frames, and support frame is equally spaced and distributed in caisson main part inside, support frame includes the center block in central position, the outside of center block is connected with several equally spaced support rods, and the support rod is fixed with slide bar, the other end of slide bar is provided with moving rod, sliding hole is opened in moving rod, and slide bar is slidably inserted in sliding hole, limit mechanism is further provided on moving rod, for limiting the sliding of slide bar, the outside end of moving rod is fixed with arc support rod, sliding slot is opened in the middle position of arc support rod, and arc support rod is slidably arranged on vertical slide rail through sliding slot.

[0008] Preferably, the limit mechanism includes a sliding sleeve slidably disposed on the outside of the moving rod, and a top rod fixed to the outside of the sliding sleeve, one end of the top rod abuts against the vertical slide rail, and the end of the top rod close to the vertical slide rail is provided with an inclined surface, two symmetrically distributed circular holes are opened in the sliding sleeve, a limit block is slidably disposed in the circular hole, one end of the limit block close to the sliding hole is hemispherical, the other end is inclined, the hemispherical end of the limit block abuts against the end of the slide bar, two triangular grooves with inclined bottom surface are opened in the inner surface of the sliding sleeve, and the inclined surface of the limit block abuts against the groove bottom of the triangular groove, a tension spring is disposed in the sliding hole, and the two ends of the tension spring are fixed with the bottom of the sliding hole and the slide bar respectively.

[0009] Preferably, one end of the slide bar inside the sliding hole is fixed with a fixed sleeve, the fixed sleeve is sleeved on the outside of the tension spring, the outside of the fixed sleeve abuts against the limit block, one end of the sliding sleeve close to the center block is provided with an extension sleeve, and the extension sleeve is sleeved on the outside of the support rod.

[0010] Preferably, a plurality of first annular grooves equally spaced are opened in the outside of the moving rod, and a first sealing ring is sleeved in the first annular groove, the outside of the first sealing ring abuts against the inner wall of the sliding sleeve, a plurality of second annular grooves equally spaced are opened in the outside of the support rod, and a second sealing ring is sleeved in the second annular groove, the outside of the second sealing ring abuts against the inner wall of the extension sleeve.

[0011] Preferably, a plurality of connecting rods equally spaced are fixed on the center block, the support rods are connected to the corresponding connecting rods respectively, a first half-width plate is provided on the support rod, a second half-width plate is provided on the connecting rod, the first half-width plate and the second half-width plate are detachably connected by a plurality of fixing bolts, and a support connecting rod is provided between the two sides of the connecting rod and the two ends of the arc-shaped support rod.

[0012] Preferably, the supporting link includes a first link hinged at the side end of the connecting rod, a first long slot is provided at the end of the first link away from the connecting rod, a second link is hinged at the end of the arc-shaped support rod, a second long slot is provided at the end of the second link away from the arc-shaped support rod, and the first link and the second link are fixed by two connecting bolts.

[0013] Preferably, the sliding sleeve is provided with two square holes, and a square block is arranged in the square hole, a triangular groove is provided on the inner side of the square block, a plurality of connecting ears are fixed on the sliding sleeve, and the connecting ears are located on both sides of the square hole, a connecting seat is provided at the upper end of the square block, and a fixing hole is provided in the connecting seat, a mounting bolt is provided between the two connecting ears, and the mounting bolt passes through the fixing hole.

[0014] Preferably, a lifting lug is fixed above the central block, and the lifting lug is integrally formed with the central block.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The casing body is supported from the inside by multiple support frames to prevent the casing body from being deformed. When the casing goes deep into the ground, the support frame below is blocked by the soil inside the casing body. At this time, the arc-shaped support rod and the vertical slide rail slide against each other, and the support frames inside the casing body are all gathered at the part of the casing body that is higher than the ground. After the support frame is moved upward and disengaged from the vertical slide rail, the limit of the sliding rod and the moving rod is released by the limit mechanism, so that the moving rod moves along the sliding rod in the direction close to the center block, and then the support frame can be taken out from the upper end of the casing body, which not only improves the strength of the casing, but also can be reused in other casings to reduce costs.

[0017] At the same time, the limiting mechanism can prevent the moving rod from shrinking and provide support for the casing body. When the arc-shaped support rod is upwardly separated from the vertical slide rail, the limiting mechanism can drive the moving rod to shrink, making it easy to take out the support frame and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall axial side structure of the present invention.

[0019] Figure 2 Schematic diagram of the internal structure of the casing body in the present invention.

[0020] Figure 3 Schematic diagram of the overall structure of the support frame in the present invention.

[0021] Figure 4 It is a schematic diagram of the partial structure of the support frame in the present invention.

[0022] Figure 5 It is a schematic diagram of the structure inside the sliding sleeve of the present invention.

[0023] Figure 6 It is a schematic cross-sectional structural diagram of the moving rod in the present invention.

[0024] Figure 7 It is a schematic diagram of the disassembly structure of the block in the present invention.

[0025] In the picture:

[0026] 1. Casing body; 2. Hammer sleeve; 3. Vertical slide rail; 4. Incision; 5. Pointed head; 6. Center block; 7. Support rod; 8. Slide rod; 9. Moving rod; 10. Slide hole; 11. Arc support rod; 12. Tension spring; 13. Limit block; 14. Sliding sleeve; 15. Push rod; 16. Triangular groove; 17. Fixed sleeve; 18. Extension sleeve; 19. First sealing ring; 20. Second sealing ring; 21. Connecting rod; 22. First half-width plate; 23. Second half-width plate; 24. Fixing bolt; 25. First connecting rod; 26. Second connecting rod; 27. Second long notch; 28. First long notch; 29. ​​Connecting bolt; 30. Square hole; 31. Connecting ear; 32. Block; 33. Connecting seat; 34. Mounting bolt; 35. Lifting ear. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 7 As shown, the present invention provides a casing for bored piles in foundation pits, comprising a casing body 1, a hammer sleeve 2 provided at the upper end of the casing body 1, the hammer sleeve 2 covering the upper edge of the casing body 1, an incision 4 provided at the lower end of the casing body 1, a plurality of vertical slide rails 3 evenly distributed around the circumference fixed to the inner wall of the casing body 1, and a pointed head 5 provided at the lower end of the vertical slide rail 3, a plurality of support frames provided on the inner side of the casing body 1, and the support frames are evenly spaced up and down inside the casing body 1. The support frame comprises a central block 6 located at the center, a plurality of support rods 7 evenly spaced are connected to the outer side of the central block 6, and a slide rod 8 is fixed to the support rod 7, a moving rod 9 is provided at the other end of the slide rod 8, a slide hole 10 is provided on the moving rod 9, and the slide rod 8 is slidably inserted in the slide hole 10. A limiting mechanism is also provided on the moving rod 9 to limit the sliding of the slide rod 8. An arc-shaped support rod 11 is fixed to the outer end of the moving rod 9 , a sliding groove (not marked in the figure) is opened in the middle position of the arc-shaped support rod 11 , and the arc-shaped support rod 11 is slidably set on the vertical slide rail 3 through the sliding groove.

[0029] When the casing is lowered to the set height, the support frames at the bottom are blocked by the soil inside the casing body 1. At this time, the arc-shaped support rod 11 and the vertical slide rail 3 slide with each other. When the casing body 1 is lowered to the set height, the support frames inside it will all gather at the part of the casing body 1 above the ground. After the support frame moves upward and disengages from the vertical slide rail 3, the limit of the slide rod 8 and the moving rod 9 is released by the limit mechanism, so that the moving rod 9 moves along the slide rod 8 in the direction close to the center block 6. Then the support frame can be taken out from the upper end of the casing body 1, and the support frame can be reused in other casings.

[0030] like Figure 6 As shown, the limiting mechanism includes a sliding sleeve 14 slidably arranged on the outside of the moving rod 9, and a push rod 15 is fixed to the outside of the sliding sleeve 14, one end of the push rod 15 rests on the vertical slide rail 3, and an inclined surface (not marked in the figure) is provided on the end of the push rod 15 close to the vertical slide rail 3, and two symmetrically distributed circular holes (not marked in the figure) are provided on the sliding sleeve 14, and a limiting block 13 is slidably arranged in the circular hole, and the end of the limiting block 13 close to the sliding hole 10 is hemispherical, and the other end is an inclined surface, and the hemispherical end of the limiting block 13 is against the end of the sliding rod 8, and the inner surface of the sliding sleeve 14 is provided with two triangular grooves 16 with inclined bottom surfaces, and the inclined surface of the limiting block 13 is against the bottom of the triangular groove 16, and a tension spring 12 is provided in the sliding hole 10, and the two ends of the tension spring 12 are respectively fixed to the bottom of the sliding hole 10 and the sliding rod 8.

[0031] It should be noted that the moving rod 9 and the slide rod 8 are subjected to the tension of the tension spring 12, and have a tendency to approach each other. However, due to the obstruction of the limit block 13, the moving rod 9 and the slide rod 8 cannot approach each other, and thus a supporting force can be provided from the inside of the casing body 1 to prevent the casing body 1 from deforming. When the support frame moves to the top of the vertical slide rail 3, the top rod 15 loses the obstruction of the vertical slide rail 3. At this time, the tension spring 12 pulls the moving rod 9, and the moving rod 9 approaches the slide rod 8, and the end of the slide rod 8 presses against the limit block When the arc-shaped support rod 11 slides on the vertical slide rail 3, the limiting mechanism can prevent the moving rod 9 from contracting and provide supporting force for the casing body 1. When the arc-shaped support rod 11 disengages from the vertical slide rail 3 upward, the limiting mechanism can drive the moving rod 9 to contract, making it convenient to take out the support frame.

[0032] like Figure 5 and Figure 6As shown, a fixed sleeve 17 is fixed to one end of the sliding rod 8 located inside the sliding hole 10, and the fixed sleeve 17 is sleeved on the outside of the tension spring 12, and the outer side of the fixed sleeve 17 is against the limit block 13. An extension sleeve 18 is provided at one end of the sliding sleeve 14 close to the center block 6, and the extension sleeve 18 is sleeved on the outside of the support rod 7.

[0033] It should be noted that the fixed sleeve 17 can provide support for the limit block 13 to prevent the limit block 13 from entering the sliding hole 10 and causing the device to get stuck. The extension sleeve 18 cooperates with the sliding sleeve 14 to simultaneously cover the support rod 7 and the moving rod 9, thereby improving the connection strength and preventing the sliding rod 8 located between the two from bending and deforming when providing support force to the casing body 1, thereby improving the structural strength.

[0034] like Figure 5 As shown, the outer side of the movable rod 9 is provided with a plurality of first annular grooves (not marked in the figure) distributed at equal intervals, and a first sealing ring 19 is sleeved in the first annular groove, and the outer side of the first sealing ring 19 abuts against the inner wall of the sliding sleeve 14. The outer side of the support rod 7 is provided with a plurality of second annular grooves (not marked in the figure) distributed at equal intervals, and a second sealing ring 20 is sleeved in the second annular groove, and the outer side of the second sealing ring 20 abuts against the inner wall of the extension sleeve 18.

[0035] It should be noted that the operating environment of the casing is generally a mixed environment of mud, water and sand, and the support frame will inevitably come into contact with the turbid mixture, or even be directly soaked in mud and water. When the sliding sleeve 14 and the extension sleeve 18 slide with the internal support rod 7 and the moving rod 9, the first sealing ring 19 and the second sealing ring 20 can prevent impurities such as mud, water and sand from entering the interior, prevent the structure from being worn or stuck, and multiple first sealing rings 19 and second sealing rings 20 can improve the sealing effect.

[0036] like Figure 4 As shown, a number of equally spaced connecting rods 21 are fixed on the central block 6, and the support rods 7 are connected to the corresponding connecting rods 21 respectively. A first half-width plate 22 is provided on the support rod 7, and a second half-width plate 23 is provided on the connecting rod 21. The first half-width plate 22 and the second half-width plate 23 are detachably connected by a plurality of fixing bolts 24, and supporting connecting rods are provided between the two sides of the connecting rod 21 and the two ends of the arc-shaped support rod 11.

[0037] It should be noted that the support rod 7 can be disassembled and installed through the fixing bolt 24. In actual use, the support frame can be reused, but the width of the casing body 1 is different in different construction operations. At this time, the support rod 7 can be disassembled and then connected to the central block 6 with connecting rods 21 of different lengths to improve the reuse effect of the support frame, and the supporting connecting rods on both sides can further improve the supporting force of the arc-shaped support rod 11.

[0038] like Figure 4 As shown, the supporting link includes a first link 25 hinged at the side end of the connecting rod 21, and a first long slot 28 is provided at the end of the first link 25 away from the connecting rod 21. The end of the arc-shaped support rod 11 is hinged with a second link 26, and the end of the second link 26 away from the arc-shaped support rod 11 is provided with a second long slot 27, and the first link 25 and the second link 26 are fixed by two connecting bolts 29.

[0039] It should be noted that the connecting bolt 29 can slide in the first long slot 28 and the second long slot 27 before being tightened. Therefore, the length of the support link composed of the first connecting rod 25 and the second connecting rod 26 is adjustable. By adjusting the length of the support link, the curvature of the arc-shaped support rod 11 can be changed. When matching casing bodies 1 of different diameters, it can fit more closely with the inner wall of the casing body 1, thereby achieving a better supporting effect.

[0040] like Figure 7 As shown, the sliding sleeve 14 is provided with two square holes 30, and a square block 32 is provided in the square hole 30. The triangular groove 16 is provided on the inner side of the square block 32. A plurality of connecting ears 31 are fixed to the sliding sleeve 14, and the connecting ears 31 are located on both sides of the square hole 30. A connecting seat 33 is provided at the upper end of the square block 32, and a fixing hole (not marked in the figure) is provided in the connecting seat 33. A mounting bolt 34 is provided between the two connecting ears 31, and the mounting bolt 34 passes through the fixing hole.

[0041] It should be noted that after removing the mounting bolts 34, the block 32 can be taken out of the square hole 30. The inner side of the block 32 is the limit block 13. After removing the block 32, the worn limit block 13 can be replaced, and the equipment can also be repaired when it is stuck, which makes the operation more convenient. When assembling the equipment, the sliding sleeve 14 can be first inserted from one end of the moving rod 9, and then the square hole 30 can be aligned with the round hole, which makes the installation more convenient.

[0042] like Figure 3 As shown, a lifting lug 35 is fixed above the central block 6 , and the lifting lug 35 and the central block 6 are integrally formed.

[0043] It should be noted that when the casing body 1 is slightly deformed during use, the inner wall of the casing body 1 is pressed against the arc-shaped support rod 11, and it is difficult to remove the support frame by manpower. At this time, lifting equipment can be used to lift the support frame as a whole upward through the lifting lug 35, which is more convenient in actual use.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the accompanying embodiments and their equivalents.

Claims

1. A casing for bored piles in foundation pits, comprising a casing body (1), characterized in that: The upper end of the casing body (1) is provided with a hammer sleeve (2), which covers the upper edge of the casing body (1). The lower end of the casing body (1) is provided with an incision (4). A plurality of vertical slide rails (3) evenly distributed around the circumference are fixed on the inner wall of the casing body (1), and a pointed head (5) is provided at the lower end of the vertical slide rail (3). A plurality of support frames are provided on the inner side of the casing body (1), and the support frames are evenly spaced up and down inside the casing body (1). The support frames include a central block located at the center. (6), the outer side of the center block (6) is connected to a plurality of support rods (7) distributed at equal intervals, and a slide rod (8) is fixed on the support rod (7), and a moving rod (9) is provided at the other end of the slide rod (8), and a sliding hole (10) is opened on the moving rod (9), and the slide rod (8) is slidably inserted in the sliding hole (10), and a limiting mechanism is also provided on the moving rod (9) for limiting the sliding of the slide rod (8), and an arc-shaped support rod (11) is fixed on the outer end of the moving rod (9), and the arc-shaped support rod (11) A sliding groove is provided in the middle position, and the arc-shaped support rod (11) is slidably arranged on the vertical slide rail (3) through the sliding groove. The limiting mechanism includes a sliding sleeve (14) slidably arranged on the outside of the moving rod (9), and a push rod (15) is fixed on the outside of the sliding sleeve (14). One end of the push rod (15) is against the vertical slide rail (3), and an inclined surface is provided on the end of the push rod (15) close to the vertical slide rail (3). Two symmetrically distributed circular holes are provided on the sliding sleeve (14). The limited position is set in the circular hole. The limit block (13) is provided with a hemispherical end of the limit block (13) near the sliding hole (10), and the other end is an inclined surface, and the hemispherical end of the limit block (13) is against the end of the sliding rod (8), the inner surface of the sliding sleeve (14) is provided with two triangular grooves (16) with inclined bottom surfaces, and the inclined surface of the limit block (13) is against the groove bottom of the triangular groove (16), and a tension spring (12) is provided in the sliding hole (10), and the two ends of the tension spring (12) are respectively fixed to the bottom of the sliding hole (10) and the sliding rod (8).

2. The casing for bored piles in foundation pits according to claim 1, characterized in that: A fixed sleeve (17) is fixed to one end of the slide rod (8) located inside the slide hole (10), and the fixed sleeve (17) is sleeved on the outside of the tension spring (12). The outside of the fixed sleeve (17) abuts against the limit block (13). An extension sleeve (18) is provided at one end of the slide sleeve (14) close to the center block (6), and the extension sleeve (18) is sleeved on the outside of the support rod (7).

3. The casing for bored piles in foundation pits according to claim 2, characterized in that: The outer side of the movable rod (9) is provided with a plurality of first annular grooves distributed at equal intervals, and a first sealing ring (19) is sleeved in the first annular groove, and the outer side of the first sealing ring (19) abuts against the inner wall of the sliding sleeve (14); the outer side of the support rod (7) is provided with a plurality of second annular grooves distributed at equal intervals, and a second sealing ring (20) is sleeved in the second annular groove, and the outer side of the second sealing ring (20) abuts against the inner wall of the extension sleeve (18).

4. The casing for bored piles in foundation pits according to claim 1, characterized in that: A plurality of equally spaced connecting rods (21) are fixed to the central block (6), and the support rods (7) are connected to the corresponding connecting rods (21). A first half-width plate (22) is provided on the support rod (7), and a second half-width plate (23) is provided on the connecting rod (21). The first half-width plate (22) and the second half-width plate (23) are detachably connected by a plurality of fixing bolts (24), and supporting connecting rods are provided between the two sides of the connecting rod (21) and the two ends of the arc-shaped support rod (11).

5. The casing for bored piles in foundation pits according to claim 4, characterized in that: The supporting link comprises a first link (25) hinged at a side end of the connecting rod (21), a first long slot (28) being provided at one end of the first link (25) away from the connecting rod (21), a second link (26) being hinged at the end of the arc-shaped supporting rod (11), a second long slot (27) being provided at one end of the second link (26) away from the arc-shaped supporting rod (11), and the first link (25) and the second link (26) being fixed by two connecting bolts (29).

6. The casing for bored piles in foundation pits according to claim 1, characterized in that: The sliding sleeve (14) is provided with two square holes (30), and a square block (32) is provided in the square hole (30). The triangular groove (16) is provided on the inner side of the square block (32). A plurality of connecting ears (31) are fixed on the sliding sleeve (14), and the connecting ears (31) are located on both sides of the square hole (30). A connecting seat (33) is provided at the upper end of the square block (32), and a fixing hole is provided in the connecting seat (33). A mounting bolt (34) is provided between the two connecting ears (31), and the mounting bolt (34) passes through the fixing hole.

7. The casing for bored piles in foundation pits according to claim 1, characterized in that: A lifting lug (35) is fixed above the central block (6), and the lifting lug (35) and the central block (6) are integrally formed.

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