A casing structure for rotary digging cast-in-place pile construction

Abstract

The utility model provides a kind of pile construction with rotary digging hole filling of casing structure, comprising: several levels of casing, from bottom to top in turn gradually first and last butt joint;Several groups of screwing assembly are respectively used for screwing the first and last butt joint of adjacent casing, each group of screwing assembly includes several studs and several blocking pieces, every the stud is equipped with dismounting hole, locking mechanism is equipped on the blocking piece and one end is equipped with handle;The blocking piece is used for being inserted in the dismounting hole and being locked by the locking mechanism, and the handle of one end is exposed in the dismounting hole, when disassembling, the blocking piece is pulled out by the handle to expose the dismounting hole. The dismounting hole of stud is blocked by the additional blocking piece, to avoid that the dismounting hole is blocked by silt, ensure the stability and efficiency of stud dismounting, and the dismounting convenience of blocking piece is improved by the additional handle, and the stability of blocking piece is improved by the additional locking mechanism.

Description

Technical Field

[0001] This utility model relates to the field of casing structures, specifically a casing structure for rotary drilling cast-in-place pile construction. Background Technology

[0002] In the rotary drilling method for cast-in-place piles, in order to avoid problems such as hole collapse, diameter reduction, and grout leakage caused by rotary drilling, the traditional single-section casing is improved into a full casing mode in which multiple casing sections are connected in sequence and rotary pressed downwards to the rock layer. This forms a rotary drilling channel supported by multiple casing sections between the ground and the rock layer. After rotary drilling is completed, the reinforcing cage is inserted, and concrete is poured, the casing sections are removed one by one to improve the stability of rotary drilling.

[0003] The existing multi-section casing is connected by nesting them together and then screwing them together with several studs. The studs have hexagonal grooves on their outer ends to facilitate the insertion and rotation of disassembly tools. However, since the multi-section casing is spun underground, the hexagonal grooves are often filled with silt and sand. This makes it difficult to completely remove the silt from the hexagonal grooves when removing the casing section by section. It also makes it difficult to stably insert the disassembly tools into the hexagonal grooves, which in turn makes it difficult to disassemble the studs. This seriously affects the disassembly efficiency of the casing and creates a risk that the lower casing cannot be removed in time before the concrete hardens, thus damaging the pile foundation.

[0004] The research objective of this utility model is to design a casing structure for rotary drilling cast-in-place pile construction to address the problems existing in the prior art. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a casing structure for rotary drilling cast-in-place pile construction, which can effectively solve the problems existing in the prior art.

[0006] The technical solution of this utility model is:

[0007] A casing structure for rotary-drilled cast-in-place pile construction includes:

[0008] Several stages of casing are connected end to end from bottom to top;

[0009] Several sets of screw-in assemblies are used to screw together the end joints of adjacent upper and lower protective sleeves. Each set of screw-in assemblies includes several studs and several plugs. Each stud is provided with a disassembly hole. Each plug is provided with a locking mechanism and a handle at one end. The plug is used to insert into the disassembly hole and is locked by the locking mechanism. The handle at one end is exposed in the disassembly hole. When disassembling, the plug is pulled out by the handle to expose the disassembly hole.

[0010] Furthermore, the cross-sections of the disassembly hole and the plug are both set as the same polygon, and the handle is rotatably mounted on one end of the plug via a torsion spring. The handle is driven by the elastic force of the torsion spring to adhere to the outer wall of one end of the plug.

[0011] Furthermore, the locking mechanism includes a plurality of locking members that slide radially through the plug, a plurality of elastic members connecting the plug and the plurality of locking members, and a driving member that is axially limited and slidably disposed in one end of the plug and rotatably connected to the handle. The inner wall of the disassembly hole is provided with an annular recessed locking groove corresponding to the outer ends of the plurality of locking members. The inner ends of the plurality of locking members are inclinedly arranged to form a plurality of driving surfaces with a spacing that gradually increases toward the handle. The other end of the driving member is inclinedly arranged to form a driving part corresponding to the plurality of driving surfaces.

[0012] Furthermore, the blocking component has a plurality of sliding holes connected at one end in the radial direction and a driving hole connecting the plurality of sliding holes in the axial direction. A plurality of locking components are slidably disposed in the sliding holes, and the driving component is slidably disposed in the driving hole. The inner wall of the driving hole is recessed and has a limiting groove. The limiting groove extends axially along the driving hole and then extends circumferentially to form a limiting area. The side wall of the driving component has a protruding limiting part that is limited in the limiting groove. The handle is set as a semi-circular ring, and the disassembly hole has a hexagonal cross section. By driving the driving component inward and outward through the handle, the locking components are locked into the locking groove. By rotating the driving component through the handle until the limiting part rotates into the limiting area and is limited, the handle is flipped to fit against the outer wall of one end of the blocking component and is restricted from rotation by the inner wall of the disassembly hole.

[0013] Furthermore, it also includes a disassembly post adapted to the disassembly hole. The upper outer wall of each sleeve is recessed to form an inner sleeve, and the lower inner wall is recessed to form an outer sleeve. Both the inner sleeve and the outer sleeve are provided with a plurality of circumferentially spaced threaded holes through them. The plurality of threaded holes are arranged symmetrically in pairs along the diameter of the sleeve and in opposite directions. The disassembly hole passes through the stud laterally. When the disassembly hole is exposed, the disassembly post passes through two disassembly holes that are symmetrical along the diameter of the sleeve laterally.

[0014] Furthermore, each inner sleeve has a protruding outer wall with several vertically extending fitting portions, and each outer sleeve has a recessed lower end with several fitting grooves corresponding to the fitting portions. When an outer sleeve is fitted onto an inner sleeve, several fitting portions are fitted into the fitting grooves and several screw holes on the inner and outer sides correspond to each other.

[0015] Furthermore, the lower end of the first-level protective sleeve on the lowest side is detachably provided with a spinning shoe, and the lower end of the spinning shoe is provided with a plurality of spinning tools.

[0016] Therefore, the beneficial effects of this utility model are:

[0017] 1. By adding a plugging component to the disassembly and assembly holes of the plugging stud, the disassembly and assembly holes are prevented from being blocked by mud and sand. The addition of a handle improves the ease of disassembly and assembly of the plugging component, and the addition of a locking mechanism improves the stability of the plugging component. This replaces the existing ordinary stud with hexagonal grooves, which can prevent the disassembly and assembly holes of the stud from being blocked by mud and sand when it is taken out after the casing has been spun underground for use, making it difficult to disassemble the stud. This ensures the stability and efficiency of stud disassembly and assembly, and avoids the situation where the casing cannot be disassembled in time before the concrete solidifies, which may damage the guide pile foundation. This greatly improves the stability of the construction of rotary bored piles using the full casing mode.

[0018] 2. By rotating the handle, the distance from the outer side of the handle to the other end of the plug is matched with the length of the disassembly hole when the plug is inserted into the disassembly hole. This reduces the depth of the handle in the disassembly hole while avoiding direct contact and damage between the handle and the inner wall of the pile hole. This also reduces the depth to which the handle is buried in mud and sand after the casing is removed. This allows workers to easily pry the handle out of the mud and sand and rotate it to a position perpendicular to the plug before pulling it out. This ensures the ease of disassembling the plug and improves the ease of exposing the disassembly hole, thereby improving the ease of removing the stud through the disassembly hole.

[0019] 3. Through the cooperation between the driving component and the locking component, the locking component can be easily pushed radially outward and inserted into the locking groove for limiting by driving the driving component with the handle on the outside. This greatly improves the convenience of locking the plugging component. In addition, a stable axial limit is formed between several locking components and the locking groove, which can prevent the plugging component from detaching from the disassembly hole axially during the use of the protective sleeve.

[0020] 4. Through the cooperation between the limiting groove and the limiting part, not only is the axial sliding displacement of the driving component limited, but also the driving component is limited by moving the handle inward and rotating it to the limiting part to enter the limiting area, thus ensuring the locking stability of several locking components. At the same time, in order to prevent the plug from loosening during the use of the protective sleeve, the handle is flipped to fit against the outer wall of the plug and its rotation is restricted by the inner wall of the disassembly hole. Thus, the rotation of the handle is limited by the polygonal inner wall of the disassembly hole, thereby limiting the rotation of the driving component and preventing the plug from loosening, further improving the stability of the plug. Attached Figure Description

[0021] Figure 1 This is a partial exploded structural diagram of a casing structure used in rotary drilling cast-in-place pile construction.

[0022] Figure 2 This is a schematic diagram of the stud structure.

[0023] Figure 3This is a schematic diagram of the blocking component and the locking mechanism.

[0024] Figure 4 This is a structural diagram of the driving and locking components.

[0025] Figure 5 This is a cross-sectional view of the plugging component.

[0026] Figure 6 This is a cross-sectional view of the stud.

[0027] Figure 7 This is a structural diagram of two studs and a disassembly / reassembly post. Detailed Implementation

[0028] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0029] Example 1

[0030] refer to Figure 1-6 A casing structure for rotary-drilled cast-in-place pile construction, comprising:

[0031] Several stages of casing 1 are connected end to end from bottom to top;

[0032] Several sets of screw-in assemblies are used to screw together the end joints of adjacent upper and lower protective sleeves 1. Each set of screw-in assemblies includes several studs 2 and several plugs 3. Each stud 2 is provided with a disassembly hole 21. The plug is provided with a locking mechanism 4 and a handle 31 at one end. The plug is used to be inserted into the disassembly hole 21 and locked by the locking mechanism 4. The handle 31 at one end is exposed in the disassembly hole 21. When disassembling, the plug is pulled out by the handle 31 to expose the disassembly hole 21.

[0033] The above-mentioned structure, by adding a plugging component 3 to plug the disassembly and assembly hole 21 of the stud 2, avoids the disassembly and assembly hole 21 from being blocked by mud and sand. The addition of a handle 31 improves the ease of disassembly and assembly of the plugging component 3, and the addition of a locking mechanism 4 improves the stability of the plugging component 3. This replaces the existing ordinary stud 2 with a hexagonal groove, and avoids the situation where the disassembly and assembly hole 21 of the stud 2 is blocked by mud and sand when it is taken out after the casing 1 has been spun underground for use, making it difficult to disassemble the stud 2. This ensures the stability and efficiency of the disassembly and assembly of the stud 2, and avoids the situation where the casing 1 is not disassembled in time before the concrete solidifies, resulting in damage to the guide column pile foundation. This greatly improves the stability of the rotary drilling and grouting pile construction using the full casing 1 mode.

[0034] To improve the efficiency of disassembling and assembling the plugging component 3, both the disassembly hole 21 and the plugging component 3 have the same polygonal cross-section. The handle 31 is rotatably mounted on one end of the plugging component 3 via a torsion spring. The handle 31 is driven by the elastic force of the torsion spring to adhere to the outer wall of one end of the plugging component 3. By rotating the handle 31, when the plugging component 3 is inserted into the disassembly hole 21, the distance from the outer side of the handle 31 to the other end of the plugging component 3 is adapted to the length of the disassembly hole 21. This reduces the depth of the handle 31 in the disassembly hole 21 without causing damage by direct contact between the handle 31 and the inner wall of the pile hole. This also reduces the depth to which the handle 31 is buried by mud and sand after the casing 1 is removed. This allows workers to easily pry the handle 31 out of the mud and sand, rotate it to a position perpendicular to the plugging component 3, and pull it out. This ensures the ease of disassembling the plugging component 3, improves the ease of exposing the disassembly hole 21, and further improves the ease of disassembling the stud 2 through the disassembly hole 21.

[0035] To improve the ease of locking the plug 3, the locking mechanism 4 includes a plurality of locking members 41 that slide radially through the plug 3, a plurality of elastic members 42 that connect the plug 3 and the plurality of locking members 41, and a driving member 43 that is axially limited and slidably disposed in one end of the plug 3 and rotatably connected to the handle 31. The inner wall of the disassembly hole 21 is annularly recessed and provided with locking grooves 211 corresponding to the outer ends of the plurality of locking members 41. The inner ends of the plurality of locking members 41 are inclinedly arranged to form a plurality of driving surfaces 411 with a spacing that gradually increases toward the handle 31. The other end of the driving member 43 is inclinedly arranged to form a driving part 431 corresponding to the plurality of driving surfaces 411. The above structure, through the cooperation between the driving member 43 and the locking member 41, allows the locking member 41 to be easily pushed radially outward and inserted into the locking groove 211 for limiting by driving the driving member 43 with the handle 31 on the outside. This greatly improves the convenience of locking the plugging member 3. Furthermore, a stable axial limit is formed between several locking members 41 and the locking groove 211, which can prevent the plugging member 3 from detaching from the disassembly hole 21 axially during the use of the protective sleeve 1.

[0036] To improve the ease of positioning the driving component 43, the blocking component 3 is provided with a plurality of sliding holes 32 connected at one end in the radial direction and a driving hole 33 communicating with the plurality of sliding holes 32 in the axial direction. A plurality of locking components 41 are slidably disposed within the sliding holes 32, and the driving component 43 is slidably disposed within the driving hole 33. A limiting groove 331 is recessed in the inner wall of the driving hole 33. The limiting groove 331 extends axially along the driving hole 33 and then circumferentially to form a limiting area 332. The sidewall of the driving component 43 protrudes. A limiting part 432 is provided in the limiting groove 331, the handle 31 is set as a semi-circular ring, and the disassembly hole 21 is set as a hexagonal cross section; the driving member 43 is driven by the handle 31 to move inward and push outward a number of the locking members 41 to lock into the locking groove 211; the driving member 43 is rotated by the handle 31 until the limiting part 432 rotates into the limiting area 332 and is limited; the handle 31 is flipped to fit against the outer wall of one end of the blocking member 3 and is restricted from rotation by the inner wall of the disassembly hole 21. The cooperation between the limiting groove 331 and the limiting part 432 not only limits the axial sliding displacement of the driving member 43, but also limits the driving member 43 by moving the handle 31 inward and rotating it to the limiting part 432 to enter the limiting area 332, thus ensuring the locking stability of several locking members 41. At the same time, in order to prevent the plugging member 3 from loosening during the use of the protective sleeve 1, the handle 31 is flipped to fit against the outer wall of the plugging member 3 and its rotation is restricted by the inner wall of the disassembly hole 21. Thus, the rotation of the handle 31 is restricted by the polygonal inner wall of the disassembly hole 21, thereby restricting the rotation of the driving member 43 and preventing the plugging member 3 from loosening, further improving the stability of the plugging member 3.

[0037] To improve the accuracy of the mating between the sleeves 1, each inner sleeve 11 has a plurality of vertically extending fitting portions 111 protruding from its outer wall, and each outer sleeve 12 has a plurality of corresponding fitting grooves 121 recessed at its lower end. When an outer sleeve 12 is fitted over an inner sleeve 11, the plurality of fitting portions 111 are fitted into the fitting grooves 121, and the plurality of screw holes 13 on the inner and outer sides correspond to each other. Thus, by adding a plurality of fitting portions 111 and fitting grooves 121, the mating stability between adjacent sleeves 1 is improved, ensuring that the plurality of screw holes 13 on the inner and outer sides can be quickly mated, thereby improving the connection efficiency between the sleeves 1.

[0038] Specifically, the lower end of the first-level protective sleeve 1 on the lowest side is detachably provided with a spinning shoe 6, and the lower end of the spinning shoe 6 is provided with a plurality of spinning cutters 61.

[0039] Working principle:

[0040] The converter of the rotary drilling machine is connected to the first-stage casing 1 with the rotary shoe 6 and partially rotary-dried into the soil layer. The converter is then connected to the rotary drilling device to rotary-drill downwards inside the first-stage casing 1. After rotary-drilling is completed, the converter is connected to the second-stage casing 1. The second-stage casing 1 and the first-stage casing 1 are screwed together by the stud 2. Then, the plug 3 is installed and inserted into the disassembly hole 21 of the stud 2, and the downward rotary-driving continues. The converter is then connected to the rotary drilling device again to rotary-drill downwards inside the second-stage and first-stage casing 1. This process is repeated until several casings 1 are connected end to end from bottom to top and the first-stage casing 1 reaches the stable rock layer. The converter is then connected to the rotary drilling device to continue rotary-drilling downwards along the axis of several casings 1 to the designated position, thereby forming a pile hole inside several casings 1.

[0041] After cleaning and inspecting the pile hole, the reinforcing cage is installed into the pile hole and concrete is poured. Before the concrete sets, the uppermost protective casing 1 is pulled out and disassembled step by step through the converter. When disassembling, first pry out the handle 31 and rotate the handle 31 to make the limiting part 432 disengage from the limiting area 332. Then pull out the driving part 43 to make several locking parts 41 disengage from the locking groove 211. Then pull the handle 31 to drive the blocking part 3 out of the disassembly hole 21 through the driving part 43. After the disassembly hole 21 is exposed, the stud 2 is disassembled by inserting the disassembly tool into the disassembly hole 21.

[0042] Example 2

[0043] To improve the stability of the connection between the sleeves 1, multiple studs 2 are usually used for screwing. However, this makes it very time-consuming to remove the screws 2. (Refer to...) Figure 7 The difference between this embodiment and Embodiment 1 is that:

[0044] To improve the disassembly efficiency of the stud 2, the sleeve 1 structure also includes a disassembly post 5 adapted to the disassembly hole 21. The upper outer wall of each sleeve 1 is recessed to form an inner sleeve 11, and the lower inner wall is recessed to form an outer sleeve 12. The inner sleeve 11 and the outer sleeve 12 are each provided with a plurality of circumferentially spaced threaded holes 13. The plurality of threaded holes 13 are arranged symmetrically in pairs along the diameter of the sleeve 1 and the threading directions are opposite. The disassembly hole 21 is provided transversely through the stud 2. When the disassembly hole 21 is exposed, the disassembly post 5 is used to transversely penetrate two disassembly holes 21 that are symmetrical along the diameter of the sleeve 1. With the above-described structure, when installing studs 2, the two symmetrical studs 2 can be manually screwed into the screw holes 13 first. Then, the disassembly post 5 is inserted laterally through the disassembly holes 21 of the two studs 2. One or both ends of the disassembly post 5 are then rotated using a tool, thereby driving the two studs 2 to be screwed into the screw holes 13 simultaneously. This method of screwing two studs 2 at once greatly improves the efficiency of stud installation. When removing studs 2, the plug 3 is first removed to expose the disassembly holes 21. Then, the disassembly post 5 is inserted laterally through the two symmetrical disassembly holes 21. One or both ends of the disassembly post 5 are then rotated using a tool, thereby driving the two studs 2 to be screwed out of the screw holes 13 simultaneously. This method of removing two studs 2 at once greatly improves the efficiency of stud removal.

[0045] It should be noted that this embodiment is implemented in the same way as embodiment one in terms of principle and technical effect. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in embodiment one.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A casing structure for rotary-drilled cast-in-place pile construction, characterized in that, include: Several stages of casing (1) are connected end to end from bottom to top; Several sets of screw-in components are used to screw together the end joints of adjacent upper and lower protective sleeves (1). Each set of screw-in components includes several studs (2) and several plugs (3). Each stud (2) is provided with a disassembly hole (21). The plug (3) is provided with a locking mechanism (4) and a handle (31) at one end. The plug (3) is used to be inserted into the disassembly hole (21) and locked by the locking mechanism (4). The handle (31) at one end is exposed in the disassembly hole (21). When disassembling, the plug (3) is pulled out by the handle (31) to expose the disassembly hole (21).

2. The casing structure for rotary-drilled cast-in-place pile construction as described in claim 1, characterized in that, The cross-sections of the disassembly hole (21) and the plug (3) are both set as the same polygon. The handle (31) is rotatably disposed at one end of the plug (3) by a torsion spring. The handle (31) is driven by the elastic force of the torsion spring to adhere to the outer wall of one end of the plug (3).

3. The casing structure for rotary-drilled cast-in-place pile construction as described in claim 2, characterized in that, The locking mechanism (4) includes a plurality of locking members (41) that slide radially through the plug (3), a plurality of elastic members (42) that connect the plug (3) and the plurality of locking members (41), and a driving member (43) that is axially limited and slidably disposed in one end of the plug (3) and rotatably connected to the handle (31). The inner wall of the disassembly hole (21) is provided with a locking groove (211) corresponding to the outer end of the plurality of locking members (41). The inner ends of the plurality of locking members (41) are inclinedly arranged to form a plurality of driving surfaces (411) with a spacing that gradually increases toward the handle (31). The other end of the driving member (43) is inclinedly arranged to form a driving part (431) corresponding to the plurality of driving surfaces (411).

4. The casing structure for rotary-drilled cast-in-place pile construction as described in claim 3, characterized in that, The blocking member (3) is provided with a plurality of sliding holes (32) connected at one end in the radial direction and a driving hole (33) connecting the plurality of sliding holes (32) in the axial direction. A plurality of locking members (41) are respectively slidably disposed in the sliding holes (32). The driving member (43) is slidably disposed in the driving hole (33). The inner wall of the driving hole (33) is recessed and provided with a limiting groove (331). The limiting groove (331) extends axially along the driving hole (33) and then extends circumferentially to form a limiting area (332). The side wall of the driving member (43) is protruding and provided with a limiting area. The limiting part (432) of the slot (331) is provided. The handle (31) is set as a semi-circular ring and the cross section of the disassembly hole (21) is set as a hexagon. The driving member (43) is driven by the handle (31) to move inward and push outward several locking members (41) to lock into the locking groove (211). The driving member (43) is rotated by the handle (31) until the limiting part (432) rotates into the limiting area (332) and is limited. Then, the handle (31) is flipped to fit against the outer wall of one end of the blocking member (3) and is restricted from rotation by the inner wall of the disassembly hole (21).

5. The casing structure for rotary-drilled cast-in-place pile construction as described in claim 1, characterized in that, It also includes a disassembly post (5) adapted to the disassembly hole (21). The upper outer wall of each sleeve (1) is recessed to form an inner sleeve (11), and the lower inner wall is recessed to form an outer sleeve (12). The inner sleeve (11) and the outer sleeve (12) are provided with a plurality of circumferentially spaced threaded holes (13) through them. The plurality of threaded holes (13) are arranged symmetrically in pairs along the diameter of the sleeve (1) and the threading directions are opposite. The disassembly hole (21) passes through the stud (2) laterally. When the disassembly hole (21) is exposed, the two disassembly holes (21) that are symmetrical along the diameter of the sleeve (1) are passed through laterally by the disassembly post (5).

6. The casing structure for rotary-drilled cast-in-place pile construction as described in claim 5, characterized in that, Each inner sleeve (11) has a plurality of vertically extending fitting portions (111) protruding from its outer wall, and each outer sleeve (12) has a plurality of fitting grooves (121) corresponding to the fitting portions (111) recessed at its lower end. When an outer sleeve (12) is fitted onto an inner sleeve (11), the plurality of fitting portions (111) are fitted into the fitting grooves (121) and the plurality of screw holes (13) on the inner and outer sides are corresponding.

7. The casing structure for rotary-drilled cast-in-place pile construction as described in claim 1, characterized in that, The lower end of the first-level casing (1) at the bottom is detachably provided with a spinning shoe (6), and the lower end of the spinning shoe (6) is provided with a plurality of spinning cutters (61).

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