Cast-in-place pile casing device

Abstract

The utility model provides a cast-in-place pile casing device which at least comprises a plurality of casing units, a plurality of connecting rings and a limiting clamp spring, each casing unit is provided with more than three arc plate bodies, and the arc plate bodies are connected end to end around the axis of the casing unit in the circumferential direction to form a cylinder in an enclosing mode. The pile casing unit comprises a plurality of arc plate bodies which are distributed in the circumferential direction and form a cylinder, limiting clamp springs are arranged on the inner sides of the arc plate bodies in a clamped mode and used for keeping the arc plate bodies to be cylindrical, and when the limiting clamp springs are separated from the inner sides of the arc plate bodies, the arc plate bodies can be staggered and separated in the radial direction. Connecting rings are installed at the two ends of the pile casing unit, a limiting clamping spring is installed on the inner side of the pile casing unit, the pile casing unit can be stably inserted into a soil layer in structure, after drilling is conducted, the limiting clamping spring can relieve supporting of the arc plate bodies from the inner side, the arc plate bodies move towards the inner side, and the arc plate bodies are made to be separated from the soil layer, pulled out more easily and separated from a pile foundation hole.

Description

Technical Field

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

[0002] A bored pile is a pile made by drilling a hole in place and pouring concrete or reinforced concrete. Bored piles are widely used in construction. During the construction of bored piles, bored pile casings are often used to protect the steel bars and concrete from erosion.

[0003] Steel casing is used to protect the pile hole during the construction of bored piles. It can stabilize the hole wall and prevent collapse. Due to the high cost of steel casing, it is generally reused. In the current construction process, the steel casing will be pulled out before the concrete solidifies after pouring. The pulling out process needs to be done manually or by crane along the axis of the casing. Due to the large contact area between the casing and the soil layer and concrete, the friction is large, making it difficult to pull out. If the casing is crooked, it will also damage the soil layer and the pile body. Utility Model Content

[0004] In view of the technical problems existing in the prior art cast-in-place pile casing, according to the first aspect of the purpose of the utility model, a cast-in-place pile casing device is proposed, comprising:

[0005] A plurality of casing units are arranged in a cylindrical shape;

[0006] A plurality of connecting rings are configured to be clamped on both ends of the casing unit and used to connect the casing unit;

[0007] Wherein, the casing unit is configured to include more than three arc plates, and the plurality of arc plates are connected end to end in a circumferential direction around the axis of the casing unit to form a cylindrical body;

[0008] It also includes a limiting clamp spring, which is clamped on the inner side of the multiple arc plate bodies to maintain the multiple arc plate bodies in a cylindrical structure, and the limiting clamp spring is configured to be able to be operated from the outside to detach from the inner side of the arc plate body, so that the multiple arc plate bodies can be staggered and separated in the radial direction.

[0009] Preferably, the limit clamping spring is arranged in a "C" shape.

[0010] Preferably, the upper and lower ends of the casing unit are both provided with a first stepped groove, the upper and lower ends of the connecting ring are both provided with a second stepped groove matched with the first stepped groove, the wall thickness of the connecting ring is equal to the wall thickness of the casing unit, and the sum of the thickness of the first stepped groove and the second stepped groove is equal to the wall thickness of the casing unit, so that when a plurality of the casing units and the connecting ring are socketed in the axial direction, a casing body with a uniform wall thickness is formed;

[0011] It also includes a cone ring, which is configured to be clamped and fixed with the casing unit and / or the connecting ring and is located at the bottom end of the casing body;

[0012] One end of the cone ring is configured to be snap-fitted with the first step groove or the second step groove, and the other end is constructed as a cone ring body.

[0013] Preferably, a notch is provided on the circumferential surface wall of the limit clamping spring, and when the limit clamping spring is clamped onto the inner side of the casing unit, the length of the notch is smaller than the arc length of the arc plate body.

[0014] Preferably, the upper and lower ends of the inner side wall of the arc plate body are provided with retaining spring grooves, the limiting retaining spring is arranged to be clamped to the inner side of the retaining spring groove, and the thickness of the limiting retaining spring is equal to the depth of the retaining spring groove.

[0015] Preferably, a connecting rope is installed in the notch of the limiting clamping spring, and when the limiting clamping spring is installed in the clamping spring groove, both ends of the connecting rope are fixedly connected to the limiting clamping spring.

[0016] Preferably, a rope groove is opened in the middle position of the inner wall of the arc plate body along the circumferential direction, and a rope cover plate is fixedly provided on the inner wall of the arc plate body corresponding to the rope groove, so that the rope groove is partially covered in the circumferential direction, and when multiple arc plate bodies are surrounded to form a cylindrical body, a tie rope is installed in the rope groove, and the length of the tie rope is set to be equal to the inner diameter length of the casing unit.

[0017] Preferably, a positioning groove is provided on the outer side wall of the first step groove, and a positioning protrusion is provided on the inner side wall of the second step groove corresponding to each positioning groove, so that after the first step groove is installed inside the second step groove, the positioning groove and the positioning protrusion are engaged with each other.

[0018] Preferably, the arc plate body is configured as a rectangular arc plate, a trapezoidal arc plate or a diamond arc plate.

[0019] According to a second aspect of the utility model, a cast-in-place pile is provided, comprising a concrete pile body, and

[0020] A steel cage is coaxial with the concrete pile body and is arranged inside the concrete pile body.

[0021] The connecting rings are arranged at equal intervals on the outer wall of the concrete pile body;

[0022] Wherein, at least part of the soil layer of the concrete pile body is provided with the casing unit for maintaining the stable formation of the concrete pile body.

[0023] Compared with the prior art, the cast-in-place pile casing device proposed by the utility model has the following significant advantages:

[0024] The casing device for bored piles proposed in the utility model comprises a casing unit which comprises a plurality of arc plate bodies which are circumferentially distributed and surround the cylinder, with connecting rings installed at both ends and a limit spring installed at the inner side, so that the casing unit structure can be kept stably inserted into the soil layer; after drilling, the limit spring can be used to release the support for the arc plate body from the inner side, so that the plurality of arc plate bodies can be moved inwardly, so that the arc plate bodies can be separated from the soil layer and can be more easily pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or approximately identical component shown in each figure may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings.

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a cast-in-place pile casing device shown in an embodiment of the utility model.

[0027] Figure 2 yes Figure 1 Schematic diagram of the half-section structure.

[0028] Figure 3 It is a schematic diagram of the internal structure of the cast-in-place pile casing device shown in the embodiment of the utility model.

[0029] Figure 4 It is a structural schematic diagram of the cast-in-place pile casing device under construction state shown in an embodiment of the utility model.

[0030] Figure 5 It is a structural schematic diagram of a cast-in-place pile casing device and a steel cage shown in an embodiment of the utility model.

[0031] Figure 6 It is a structural schematic diagram of the cast-in-place pile casing device in a removed state shown in an embodiment of the utility model.

[0032] Figure 7 It is a schematic diagram of a cast-in-place pile shown in an embodiment of the utility model.

[0033] In the accompanying drawings, the meanings of the various marks are as follows:

[0034] 10. Casing unit; 101. First step groove; 102. Positioning groove; 103. Retaining spring groove; 104. Rope groove; 11. Arc plate; 111. Rope cover; 20. Connecting ring; 201. Second step groove; 202. Positioning protrusion; 30. Cone ring; 40. Limit retaining spring; 41. Connecting rope; 50. Drawing rope; 60. Steel cage; 70. Lifting ring; 71. Electric clamp; 72. Lifting rod. DETAILED DESCRIPTION

[0035] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0036] At present, the steel casing structure used in the pile foundation hole is designed to be composed of multiple sections of cylinders. The steel casing is hammered into the soil layer. During the hammering process, the steel casing squeezes the soil layer outward, resulting in a large pressure around the soil layer and the steel casing. Therefore, when the steel casing needs to be pulled out later, the friction between the soil layer and the steel casing is large, which makes it difficult to pull out. Therefore, the present invention provides a cast-in-place pile casing device, which aims to solve the problem of large friction between the casing and the soil layer and difficulty in pulling out.

[0037] Combination Figure 1-6 In the example shown, the cast-in-place pile casing device includes a plurality of casing units 10 and a plurality of connecting rings 20 .

[0038] Combination Figure 1 As shown, the casing unit 10 is configured to be cylindrical, and the connecting ring 20 is configured to be clamped on both ends of the casing unit 10 for connecting the casing unit 10, wherein the casing unit 10 and the connecting ring 20 are both made of stainless steel and have high strength, and the casing unit 10 and the connecting ring 20 have the same diameter and thickness.

[0039] Optionally, the casing unit 10 is configured to include more than three arc plates 11, and the multiple arc plates 11 are connected end to end in the circumferential direction around the axis of the casing unit 10 to form a cylindrical body. Figure 1 As shown, the casing unit 10 is formed by six arc plate bodies 11 of equal size, wherein the more the arc plate bodies 11 are set, the smaller the friction between them and the soil layer, and the easier it is to displace inward from the soil layer and then pull out. However, if the number is large, it is difficult to ensure the structural strength, so the number of arc plate bodies 11 is preferably set to three to six.

[0040] like Figure 2 and Figure 3 As shown, further, in order to maintain the structural stability after the multiple arc plate bodies 11 are surrounded to form a cylindrical body and prevent loosening during the process of hammering into the soil layer, the device also includes a limit spring 40, which is arranged to be clamped on the inner side of the multiple arc plate bodies 11 to keep the multiple arc plate bodies 11 in a cylindrical shape.

[0041] In a specific embodiment, the limit spring 40 is arranged in a "C" shape, and a notch is opened on the circumferential surface wall of the limit spring 40, and when the limit spring 40 is clamped to the inner side of the casing unit 10, the length of the notch is smaller than the arc length of the arc plate body 11, wherein the "C"-shaped limit spring 40 has an elastic force for outward expansion. During installation, the limit spring 40 is placed in a contracted state into the inner side of multiple arc plate bodies 11. After being placed in place, the limit spring 40 is released so that the limit spring 40 provides the arc plate body 11 with an elastic force for outward support, thereby maintaining the cylindrical structure of the multiple arc plate bodies 11 stable.

[0042] In order to allow the limiting clamp 40 to detach from the inner side of the arc plate body 11, multiple arc plate bodies 11 can be staggered and separated in the radial direction, wherein the head and tail connection of the arc plate body 11 is arranged to be an inclined surface. In this way, when the limiting clamp 40 does not provide outward elastic support to the arc plate body 11, one end of the arc plate body 11 can move inward, so that the outer wall surface of the arc plate body 11 is detached from the soil layer, and the process of pulling it out upward can avoid friction with the soil layer, thereby facilitating pulling out.

[0043] Furthermore, in order to ensure that the limit spring 40 can maintain its own position stable after being installed on the inner side of the arc plate body 11 and not affect the insertion of the casing into the soil layer, the upper and lower ends of the inner wall of the arc plate body 11 are provided with spring grooves 103, and the limit spring 40 is arranged to be clamped on the inner side of the spring groove 103, and the thickness of the limit spring 40 is equal to the depth of the spring groove 103, wherein the cross-section of the limit spring 40 is arranged to be rectangular and adopts a flat steel structure so that the limit spring 40 can remain stable when placed in the spring groove 103, and the cross-section of the spring groove 103 preferably adopts a trapezoidal structure to facilitate the insertion of the limit spring 40.

[0044] Furthermore, Figure 3 As shown, a connecting rope 41 is installed in the notch of the limit clamp 40, and when the limit clamp 40 is installed in the clamp groove 103, the two ends of the connecting rope 41 are fixedly connected to the limit clamp 40. The connecting rope 41 is preferably made of steel wire rope. By installing the connecting rope 41 at the notch of the limit clamp 40, when the limit clamp 40 needs to be removed, the limit clamp 40 can be pulled out of the clamp groove 103 by pulling the connecting rope 41 inward, thereby releasing the support of the limit clamp 40 on the arc plate body 11, causing the arc plate body 11 to loosen, making it easier to pull out the arc plate body 11.

[0045] like Figure 2 and Figure 3As shown, the upper and lower ends of the casing unit 10 are provided with a first stepped groove 101, the upper and lower ends of the connecting ring 20 are provided with a second stepped groove 201 that matches the first stepped groove 101, the wall thickness of the connecting ring 20 is equal to the wall thickness of the casing unit 10, and the sum of the thickness of the first stepped groove 101 and the second stepped groove 201 is equal to the wall thickness of the casing unit 10, so that when multiple casing units 10 and connecting rings 20 are socketed in the axial direction, a casing body with uniform wall thickness is formed. Preferably, the first stepped groove 101 and the second stepped groove 201 are equal in thickness and have the same height, so that when the casing unit 10 and the connecting ring 20 are socketed in the axial direction, they can maintain seamless engagement.

[0046] Furthermore, the casing device proposed in this embodiment also includes a cone ring 30, which is configured to be clamped and fixed with the casing unit 10 and / or the connecting ring 20, and is located at the bottom end of the casing body, wherein one end of the cone ring 30 is configured to be clamped and matched with the first step groove 101 or the second step groove 201, and the other end is constructed as a cone ring body. In this way, the cone ring 30 is installed at the bottom end of the casing body, and the end face of the cone ring 30 is a wedge surface. When the hammering device hammers the casing into the soil layer, it is easier to insert the casing body into the soil layer.

[0047] In a specific embodiment, when the limit spring 40 on the inner side of the arc plate body 11 releases the support for the arc plate body 11, the arc plate body 11 can be loosened inwardly. In order to facilitate the unified removal of multiple arc plate bodies 11, as shown in FIG. Figure 2 and Figure 3 As shown, a rope groove 104 is opened in the middle position of the inner wall of the arc plate body 11 along the circumferential direction, and a rope cover plate 111 is fixedly provided on the inner wall of the arc plate body 11 corresponding to the rope groove 104, so that the rope groove 104 is partially covered in the circumferential direction, and when multiple arc plate bodies 11 are surrounded to form a cylindrical body, a tie rope 50 is installed in the rope groove 104, and the length of the tie rope 50 is set to be equal to the inner diameter length of the casing unit 10.

[0048] When taking out the casing unit 10, the clamping mechanism is used to clamp the connecting rope 41 on the limiting clamping spring 40 and the drawing rope 50 in the rope groove 104 respectively, and then the clamping mechanism is driven to rise upward, and the limiting clamping spring 40 will be pulled out from the clamping spring groove 103 during the rise, thereby releasing the support of the limiting clamping spring 40 for the arc plate body 11. At the same time, the drawing rope 50 will shrink inward under the pulling action, and pull the multiple arc plate bodies 11 inward, so that the arc plate bodies 11 are separated from the soil layer, and thus are easier to be pulled out, and the drawing rope 50 can pull the multiple arc plate bodies 11 upward at the same time.

[0049] In a preferred embodiment, in order to make the connection between the arc plate body 11 and the connecting ring 20 more stable, a positioning groove 102 is provided on the outer wall of the first step groove 101, and a positioning protrusion 202 is provided on the inner wall of the second step groove 201 corresponding to each positioning groove 102, so that after the first step groove 101 is installed to the inner side of the second step groove 201, the positioning groove 102 and the positioning protrusion 202 are engaged with each other, which can make the arc plate body 11 and the connecting ring 20 less likely to move relative to each other after being clamped, and it is easy to maintain structural stability.

[0050] In an optional embodiment, the arc plate body 11 is made of stainless steel plate and is designed as a rectangular arc plate, a trapezoidal arc plate or a diamond arc plate. Figure 1-Figure 3 The diamond-shaped arc plate is easier to detach from the inner side of the soil layer, and the trapezoidal arc plate not only has good longitudinal support but is also easy to be pulled out.

[0051] The second aspect of the utility model provides a cast-in-place pile construction method, using the cast-in-place pile casing device, comprising the following steps:

[0052] Step 1: Measure the pile position, mark the preset pile position by laying out the line, and deploy the drilling machine and lifting equipment at the designated location.

[0053] Step 2: Bury casing: Figure 4 As shown, a set number of arc plate bodies 11 are connected end to end in the circumferential direction to form a casing unit 10, and a limit clamping spring 40 is installed in the clamping spring groove 103 on the inner side of the casing unit 10, so that the limit clamping spring 40 supports the arc plate body 11 and can maintain the shape of the casing unit 10 stable. After the limit clamping spring 40 is installed in place, a connecting rope 41 is installed at the notch of the limit clamping spring 40 to facilitate the later removal of the limit clamping spring 40.

[0054] Then, a drawstring rope 50 is installed inside the casing unit 10 to facilitate the subsequent removal of the arc plate body 11. Finally, a connecting ring 20 is installed at one end of the casing unit 10, and a cone ring 30 is installed at the other end for fixation to form a stable casing body. The casing unit 10 equipped with the cone ring 30 and the connecting ring 20 is inserted downward at the pile position using a vibrating hammer, and the casing unit 10 is continuously installed toward the upper end of the casing body during the insertion process to increase the height of the casing body until the casing body is inserted to the designed elevation to complete the burial of the casing. During the insertion of the casing, the axis of the casing unit 10 needs to be kept corresponding to the axis of the pile position.

[0055] Step 3, drilling and hole cleaning: After the casing is buried in place, the drilling machine drills the hole to the designed elevation. After the drilling is completed, a hole cleaner is used to clean the soil and debris in the hole.

[0056] Step 4: Lower the steel cage: Figure 5As shown, according to the design requirements, a steel cage is installed in the drilled hole, the diameter of the steel cage is smaller than the diameter of the casing, and the axis of the steel cage is kept corresponding to the axis of the casing.

[0057] Step 5: Grouting: After the steel cage is placed, use a pump to pour concrete into the drilled hole.

[0058] Step 6: Pull out the casing: Figure 6 As shown, before the concrete solidifies, a lifting machine is used to connect the lifting rod 72 to lower the lifting ring 70 into the hole and keep it descending vertically so that the lifting ring 70 is always between the steel cage and the casing during the descent. When the lifting ring 70 descends to the height of the casing unit 10 at the bottom layer, the electric clamp 71 is pulled out to clamp the connecting rope 41 on the limit clamp 40 and the binding rope 50 in the rope groove 104, and then the clamping mechanism is driven to rise upward. When rising, the limit clamp 40 will be pulled out of the clamp groove 103, releasing the support of the limit clamp 40 for the arc plate body 11. At the same time, under the pulling action, the binding rope 50 will shrink inward, pulling multiple arc plate bodies 11 inward, so that the arc plate bodies 11 are separated from the soil layer, so that they are easier to be pulled out, and the binding rope 50 can pull multiple arc plate bodies 11 upward at the same time.

[0059] Among them, there are at least three electric clamps 71 on the lifting ring 70, which are respectively used to clamp the connecting rope 41 on the upper and lower side limit springs 40 and the gathering rope 50 located in the middle position. The distribution positions of the three electric clamps 71 are pre-designed according to the distribution positions of the connecting rope 41 and the gathering rope 50. By controlling the sinking height of the lifting ring 70, the connecting rope 41 and the gathering rope 50 can be clamped.

[0060] Preferably, in step 6, according to the detected soil layer strength, the casing unit 10 of the part with poor soil layer strength can be selected to be retained in the pile hole to prevent the pile body from collapsing. In this way, the concrete at the layer height is restricted by the casing unit 10 and will not squeeze the soil layer outward. It can solidify under the restriction of the casing unit 10, thus avoiding the problem of pile body hollowness caused by concrete leakage to the outside after the casing is pulled out.

[0061] Thus, compared with the traditional casing, the casing device proposed in this embodiment can retain the casing of any height layer and remove the casing of other height layers. It can specifically reinforce the pile body part at the height of the soil layer prone to collapse, prevent leakage before the pile body is formed, and enable the pile body to be stably formed.

[0062] The third aspect of the utility model provides a cast-in-place pile, which is made by the above cast-in-place pile construction method, such as Figure 7As shown, it includes a concrete pile body, a steel cage 60 and a connecting ring 20. The steel cage 60 is coaxially arranged inside the concrete pile body, and the connecting ring 20 is equidistantly distributed on the outer wall of the concrete pile body.

[0063] Among them, the outer wall of the concrete pile body is provided with a casing unit 10 for the soil layer with poor strength, which is used to keep the concrete pile body stably formed. In this way, for some areas with uneven soil strength distribution, the pile body can be locally strengthened in a targeted manner to avoid concrete leakage in the pile hole and keep the pile body structure full and stable.

[0064] In combination with the above embodiments, the casing unit 10 includes a plurality of arc plate bodies 11 distributed circumferentially around the cylinder, with connecting rings 20 installed at both ends and limit springs 40 installed on the inside, so that the casing unit 10 can be inserted into the soil layer with a stable structure. After drilling, the limit springs 40 can be released from the inside to support the arc plate body 11, and the plurality of arc plate bodies 11 can be moved inward to separate the arc plate bodies 11 from the soil layer, so that they are easier to be pulled out. In addition, due to this pulling-out method, the removal processes of casing units 10 at different heights do not affect each other. The casings of the remaining height layers can be removed while retaining the casings of any height layer. The pile body part at the height of the soil layer that is prone to collapse can be reinforced in a targeted manner, so that leakage will not occur before the pile body is formed, and the pile body can be stably formed.

[0065] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A cast-in-place pile casing device, characterized in that: include: A plurality of casing units (10) are arranged in a cylindrical shape; A plurality of connecting rings (20) can be clamped on both ends of the casing unit (10) and used to connect the casing unit (10); The casing unit (10) is configured to include more than three arc plates (11), and the plurality of arc plates (11) are connected end to end in a circumferential direction around the axis of the casing unit (10) to form a cylindrical body; It also includes a limiting clamping spring (40) which is clamped on the inner side of the plurality of arc plate bodies (11) to maintain the plurality of arc plate bodies (11) in a cylindrical structure, and the limiting clamping spring (40) is configured to be operable from the outside to detach from the inner side of the arc plate body (11), so that the plurality of arc plate bodies (11) can be separated by displacement in the radial direction.

2. The cast-in-place pile casing device according to claim 1, characterized in that: The limit clamping spring (40) is a "C"-shaped clamping spring.

3. The cast-in-place pile casing device according to claim 2, characterized in that: The upper and lower ends of the casing unit (10) are both provided with a first stepped groove (101), the upper and lower ends of the connecting ring (20) are both provided with a second stepped groove (201) matched with the first stepped groove (101), the wall thickness of the connecting ring (20) is equal to the wall thickness of the casing unit (10), and the sum of the thickness of the first stepped groove (101) and the second stepped groove (201) is equal to the wall thickness of the casing unit (10), so that when a plurality of casing units (10) and the connecting ring (20) are plugged in and out in the axial direction, a casing body with a uniform wall thickness is formed; It also includes a cone ring (30), which is configured to be clamped and fixed with the casing unit (10) and / or the connecting ring (20) and is located at the bottom end of the casing body; One end of the cone ring (30) is configured to be snap-fitted with the first stepped groove (101) or the second stepped groove (201), and the other end is constructed as a cone ring body.

4. The cast-in-place pile casing device according to claim 2, characterized in that: A notch is provided on the circumferential surface wall of the limit clamping spring (40), and when the limit clamping spring (40) is clamped onto the inner side of the casing unit (10), the length of the notch is smaller than the arc length of the arc plate body (11).

5. The cast-in-place pile casing device according to claim 4, characterized in that: The upper and lower ends of the inner side wall of the arc plate body (11) are both provided with a retaining spring groove (103), the limiting retaining spring (40) is arranged to be clamped into the inner side of the retaining spring groove (103), and the thickness of the limiting retaining spring (40) is equal to the depth of the retaining spring groove (103).

6. The cast-in-place pile casing device according to claim 5, characterized in that: A connecting rope (41) is installed in the notch of the limiting clamping spring (40), and when the limiting clamping spring (40) is installed in the clamping spring groove (103), both ends of the connecting rope (41) are fixedly connected to the limiting clamping spring (40).

7. The cast-in-place pile casing device according to claim 1, characterized in that: A rope groove (104) is provided at the middle position of the inner side wall of the arc plate body (11) along the circumferential direction, and a rope cover plate (111) is fixedly provided on the inner side wall of the arc plate body (11) corresponding to the rope groove (104), so that the rope groove (104) is partially covered in the circumferential direction, and when a plurality of the arc plate bodies (11) are surrounded to form a cylindrical body, a tie rope (50) is installed in the rope groove (104), and the length of the tie rope (50) is set to be equal to the inner diameter length of the casing unit (10).

8. The cast-in-place pile casing device according to claim 3, characterized in that: A positioning groove (102) is provided on the outer side wall of the first stepped groove (101), and a positioning protrusion (202) is provided on the inner side wall of the second stepped groove (201) corresponding to each of the positioning grooves (102), so that after the first stepped groove (101) is installed inside the second stepped groove (201), the positioning groove (102) and the positioning protrusion (202) are engaged with each other.

9. The cast-in-place pile casing device according to claim 1, characterized in that: The arc plate body (11) is configured to be a rectangular arc plate, a trapezoidal arc plate or a rhombus arc plate.

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