Variable-diameter pile-forming device

Abstract

The present application relates to a variable-diameter piling device, which comprises a plurality of longitudinal reinforcement assembly arranged in a circumferential direction and a spiral hoop arranged on each longitudinal reinforcement assembly in an up-down direction; the variable-diameter piling device further comprises a distraction structure for driving each longitudinal reinforcement assembly away from each other to expand the diameter; the longitudinal reinforcement assembly comprises a plurality of longitudinal reinforcements arranged in an up-down direction and a longitudinal reinforcement joint between any two adjacent longitudinal reinforcements, the end of the longitudinal reinforcement is slidably inserted into the corresponding longitudinal reinforcement joint in the up-down direction; the longitudinal reinforcement joint is located at the intersection of the spiral hoop and the longitudinal reinforcement assembly, the spiral hoop penetrates through each longitudinal reinforcement joint and can slide relative to the longitudinal reinforcement joint; when the distraction structure drives each longitudinal reinforcement assembly away from each other to expand the diameter, the spiral hoop slides relative to the longitudinal reinforcement joint and drives the longitudinal reinforcement joint to move in the up-down direction to increase the depth of the longitudinal reinforcement inserted into the longitudinal reinforcement joint and shorten the length of the longitudinal reinforcement assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile foundation forming, and in particular to a variable-diameter pile forming device. BACKGROUND

[0002] Pile foundation is the most widely used deep foundation form. After years of development, great progress has been made in pile foundation materials, pile types, pile construction machinery and construction methods. The use of pile foundation can greatly reduce the workload and material consumption on the construction site. Among them, the bag pile is first drilled vertically into a columnar hole (the hole diameter is generally 300mm) at the pile site, then the bag filled with grouting pipes is placed in the columnar hole, then the cement slurry is injected into the bag, and when the strength of the cement slurry reaches a certain strength, the whole pile forms a column. When the pile spacing is appropriate, the piles can be well clamped together under the strong swelling force during grouting, thereby achieving the effect of water stopping and water isolation. Moreover, the bag pile also has the effects of reinforcing soil, improving the bearing capacity of soil, and reducing foundation settlement.

[0003] The bag pile construction technology is mature and convenient, but basically all bag piles do not have reinforcement and rely only on poured concrete or cement slurry to form piles, which may cause some engineering problems, such as: pile quality problems; insufficient pile bearing capacity; uneven settlement of pile body, etc. Therefore, in the prior art, a steel reinforcement cage is arranged in the bag to overcome the above problems.

[0004] In the prior art, the outer diameter of the steel reinforcement cage is usually variable, such as the expanding head variable diameter steel reinforcement cage disclosed in the utility model patent with the authorization announcement number CN217651769U, which comprises a plurality of longitudinal reinforcement assembly arranged in the circumferential direction and a spiral stirrup spirally wound on each longitudinal reinforcement assembly. The spiral stirrup and the longitudinal reinforcement assembly are tied together, and a margin is left between the spiral stirrup and the longitudinal reinforcement assembly during tying. The expanding head variable diameter steel reinforcement cage further comprises an expander, which can push each longitudinal reinforcement assembly apart to expand the diameter of the steel reinforcement cage. Since a margin is left between the spiral stirrup and the longitudinal reinforcement assembly during tying, the spiral stirrup slides relative to the longitudinal reinforcement assembly while expanding the diameter of the steel reinforcement cage, so that the diameter of the spiral stirrup increases while the length decreases. Among them, the longitudinal reinforcement assembly is the main reinforcement in the patent, and the spiral stirrup is the stirrup in the patent.

[0005] In the prior art, in order to ensure that the spiral stirrup can slide relative to the longitudinal reinforcement assembly when the steel reinforcement cage is expanded, a margin is left during tying, but currently the tying is done manually, and the tightness of the tying varies, which may cause the spiral stirrup to be unable to slide relative to the longitudinal reinforcement assembly due to over-tightening of the tying, or the overall strength of the steel reinforcement cage to be insufficient due to over-looseness of the tying, resulting in insufficient pile bearing capacity. SUMMARY

[0006] The present application provides a variable-diameter pile-forming device to solve the technical problem that the spiral hoop is unable to slide or the overall strength of the reinforcement cage is low when the diameter is expanded by binding the longitudinal reinforcement assembly and the spiral hoop in the prior art.

[0007] To solve the above problems, the variable-diameter pile-forming device provided by the present application adopts the following technical scheme: a variable-diameter pile-forming device, comprising:

[0008] a plurality of longitudinal reinforcement assemblies arranged circumferentially;

[0009] a spiral hoop spirally arranged on each longitudinal reinforcement assembly in the up-down direction;

[0010] a distraction structure for driving the longitudinal reinforcement assemblies away from each other to expand the diameter;

[0011] The longitudinal reinforcement assembly comprises a plurality of longitudinal reinforcements arranged in the up-down direction, and a longitudinal reinforcement joint located between any two adjacent longitudinal reinforcements, the end of the longitudinal reinforcement being slidingly and fittingly inserted into the corresponding longitudinal reinforcement joint in the up-down direction;

[0012] The longitudinal reinforcement joint is located at the intersection of the spiral hoop and the longitudinal reinforcement assembly, the spiral hoop penetrates through each longitudinal reinforcement joint and is slidable relative to the longitudinal reinforcement joint, and when the distraction structure drives the longitudinal reinforcement assemblies away from each other to expand the diameter, the spiral hoop slides relative to the longitudinal reinforcement joint and moves the longitudinal reinforcement joint in the up-down direction to increase the depth of the longitudinal reinforcement inserted into the longitudinal reinforcement joint and thus shorten the length of the longitudinal reinforcement assembly.

[0013] The beneficial effects are that the spiral hoop and the longitudinal reinforcement joint can slide relative to each other, and the longitudinal reinforcement joint and the longitudinal reinforcement are assembled in an extendable and retractable manner, the diameter of the spiral hoop increases and the length of the spiral hoop decreases when the diameter is expanded, the longitudinal reinforcement joint does not hinder the expansion of the spiral hoop, and the spiral hoop can also move in the up-down direction with the longitudinal reinforcement joint, so that the depth of the longitudinal reinforcement inserted into the longitudinal reinforcement joint gradually increases and the overall length of the longitudinal reinforcement assembly decreases. Since the spiral hoop is always connected to the longitudinal reinforcement through the longitudinal reinforcement joint, sufficient connection strength can be ensured between the spiral hoop and the longitudinal reinforcement assembly before and after expansion.

[0014] As a further improvement, the longitudinal reinforcement joint comprises a main pipe extending in the up-down direction, the spiral hoop penetrates through the main pipe, and the main pipe is provided with a longitudinal reinforcement pipe at each of the upper and lower ends, the longitudinal reinforcement being fittingly inserted into the corresponding longitudinal reinforcement pipe; the outer diameter of the longitudinal reinforcement pipe is smaller than the outer diameter of the main pipe. The outer diameter of the longitudinal reinforcement pipe is smaller than the outer diameter of the main pipe, which can reduce the amount of raw materials and reduce costs

[0015] As a further improvement, the two sides of the main pipe are also provided with hoop bar penetrating pipes in a protruding manner, the hoop bar penetrating pipes are in communication with the main pipe, and the spiral hoop bar is adapted to penetrate the hoop bar penetrating pipes. The hoop bar penetrating pipes can guide and constrain the hoop bar spiral hoop bar, increase the connection length of the hoop bar joint and the spiral hoop bar, and improve the connection strength.

[0016] As a further improvement, the expansion structure is provided with two and is separately arranged at the top and bottom of the longitudinal reinforcement assembly, the expansion structure includes a base located at the center and a telescopic rod arranged on the base, the number of the telescopic rods is equal to the number of the longitudinal reinforcement assemblies and is connected one by one in correspondence, and each telescopic rod of the expansion structure is used to drive each longitudinal reinforcement assembly to separate from each other.

[0017] As a further improvement, the variable-diameter pile-forming device includes a cross reinforcement connecting any two adjacent longitudinal reinforcement assemblies, and the cross reinforcement is located at the top and bottom of each longitudinal reinforcement assembly.

[0018] The upper end and the lower end of the longitudinal reinforcement assembly are provided with a T-shaped joint, the T-shaped joint has a longitudinal interface for inserting the longitudinal reinforcement assembly, and the T-shaped joint also has two transverse interfaces, and the cross reinforcement is movably inserted into the corresponding transverse interface.

[0019] The telescopic rod is connected to the corresponding T-shaped joint. The cross reinforcement and the longitudinal reinforcement assembly are connected together through the T-shaped joint, and the overall strength is higher.

[0020] As a further improvement, the base of the expansion structure at the top is a ring-shaped base, a grouting pipe is fixedly penetrated in the ring-shaped base, a grout outlet is arranged on the side of the grouting pipe, a cover is hinged to the grout outlet, the cover is used to close when the variable-diameter pile-forming device is lowered, and the cover is also used to be opened by being pressed by the slurry when grouting.

[0021] As a further improvement, the longitudinal reinforcement joint, the T-shaped joint, and the base are all provided with a first connecting piece.

[0022] The variable-diameter pile-forming device includes a cloth bag wrapped outside all the longitudinal reinforcement assemblies, and a second connecting piece is fixedly arranged in the cloth bag and is hooked on the first connecting piece.

[0023] As a further improvement, the variable-diameter pile-forming device also includes a spiral prefabricated pile tip at the bottom, the spiral prefabricated pile tip includes a threaded column arranged in a central position and protruding upward, and the threaded column is threadedly assembled on the base of the expansion structure at the bottom.

[0024] As a further improvement, the variable-diameter pile-forming device includes a deformable supporting reinforcement arranged outside the longitudinal reinforcement assembly, and the deformable supporting reinforcement is used to deform outward to press against the hole wall of the pile hole or extend into the cavity of the hole wall of the pile hole.

[0025] As a further improvement, the variable-diameter pile-forming device comprises a cloth bag wrapped at least on the outside of the deformable support rib. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other objects, features and advantages of the present application will become readily apparent from the detailed description that follows, read in conjunction with the accompanying drawings. In the drawings, several embodiments of the application are shown by way of example and not limitation, and like or corresponding reference numbers indicate like or corresponding parts, wherein:

[0027] Figure 1 is a schematic view of the variable-diameter pile-forming device of Example 1;

[0028] Figure 2 is a partial enlarged view of the top of the variable-diameter pile-forming device of Example 1;

[0029] Figure 3 is a partial enlarged view of the longitudinal rib joint of the variable-diameter pile-forming device of Example 1;

[0030] Figure 4 is a partial enlarged view of the middle of the variable-diameter pile-forming device of Example 1;

[0031] Figure 5 is a partial enlarged view of the bottom of the variable-diameter pile-forming device of Example 1;

[0032] Figure 6 is a schematic view of the grab crane;

[0033] Figure 7 is a partial enlarged view of the grab portion of the grab crane;

[0034] Figure 8 is a schematic view of the grab crane in the soil;

[0035] Figure 9 is a schematic view of the variable-diameter pile-forming device of Example 1 in the process of adjusting the deformation and grouting (wherein each cover is shown in the open state);

[0036] Figure 10 is a pile-forming effect diagram of Example 1;

[0037] Figure 11 is a structural schematic view of the longitudinal rib joint;

[0038] Figure 12 is a sectional view of the intersection of the longitudinal rib joint with the longitudinal rib and the spiral hoop;

[0039] Figure 13 is a schematic view of the variable-diameter pile-forming device of Example 2;

[0040] Figure 14 is a pile-forming effect diagram of Example 2;

[0041] Figure 15 schematic diagram of the variable-diameter pile-forming device in Example 3;

[0042] Figure 16 schematic diagram of the variable-diameter pile-forming device in Example 4;

[0043] Figure 17 schematic diagram of the variable-diameter pile-forming device in Example 5.

[0044] BRIEF DESCRIPTION OF DRAWINGS

[0045] 1, pile hole; 2, steel casing; 3, longitudinal reinforcement assembly; 4, longitudinal reinforcement joint; 41, main pipe; 42, longitudinal reinforcement insertion pipe; 43, stirrup insertion pipe; 5, longitudinal reinforcement; 6, T joint; 7, transverse reinforcement; 8, expansion structure; 9, base; 10, telescopic rod; 11, grouting pipe; 12, grouting port; 13, lateral ring hook; 14, cloth bag; 15, spiral stirrup; 16, connecting ring; 17, spiral precast pile tip; 171, threaded column; 18, cover; 19, grab crane; 20, rotator; 21, telescopic device; 22, grabber; 23, pile foundation cap; 24, pile foundation; 25, deformable support reinforcement; 26, cavity. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0047] The longitudinal reinforcement assembly is designed as a split telescopic structure, and is connected with the spiral stirrup through the longitudinal reinforcement joint, so that the spiral stirrup expands in diameter while the longitudinal reinforcement assembly deforms in extension and retraction, ensuring that the expansion of the spiral stirrup is not affected by the longitudinal reinforcement assembly and that the reliable connection of the spiral stirrup and the longitudinal reinforcement assembly is maintained, and the strength of the reinforcement cage before and after the diameter change can be ensured.

[0048] After introducing the basic principles of the present application, various non-limiting embodiments of the present application will be specifically introduced below. Any element quantity in the drawings is used for example and is not limited, and any naming is only used for distinction and does not have any limiting meaning.

[0049] The principles and spirits of the present application will be explained in detail below with reference to several representative embodiments of the present application.

[0050] Embodiment 1 of the variable-diameter pile-forming device provided by the present application:

[0051] AsFigures 1 to 12 As shown, the variable-diameter piling device comprises a reinforcement cage, a cloth bag 14 and a spiral prefabricated pile tip 17. The reinforcement cage comprises four longitudinal reinforcement assembly 3 which are uniformly distributed around an up-down extending axis. The top and bottom of the four longitudinal reinforcement assembly 3 are connected by four cross reinforcement 7. The four longitudinal reinforcement assembly 3 are further connected by spiral stirrup 15 which extends up and down. The spiral prefabricated pile tip 17 is installed at the bottom of the reinforcement cage. The cloth bag 14 is sleeved outside the reinforcement cage. The vertical projection of the four longitudinal reinforcement assembly 3 is located on the same level virtual circle.

[0052] As shown, the longitudinal reinforcement assembly 3 comprises a plurality of longitudinal reinforcement 5 which are arranged in sequence along the up-down direction. Any two adjacent longitudinal reinforcement 5 are not directly connected. Figure 1 The number and length of the longitudinal reinforcement 5 are determined according to the overall length of the reinforcement cage and the pitch of the spiral stirrup 15. The two adjacent longitudinal reinforcement 5 are connected by longitudinal reinforcement joint 4.

[0053] Specifically, as shown in the drawings, the longitudinal reinforcement joint 4 comprises a main pipe 41 which extends up and down and has openings at both ends. The upper end and the lower end of the main pipe 41 are respectively provided with longitudinal reinforcement pipe 42. The longitudinal reinforcement pipe 42 is in communication with the main pipe 41, and the outer diameter of the longitudinal reinforcement pipe 42 is smaller than the outer diameter of the main pipe 41, which can reduce the amount of material and save costs while allowing the longitudinal reinforcement 5 to be inserted. The inner diameter of the longitudinal reinforcement pipe 42 is adapted to the outer diameter of the longitudinal reinforcement 5. Here, the adaptation means that the longitudinal reinforcement 5 can slide in the longitudinal reinforcement pipe 42 while the amount of shaking between the longitudinal reinforcement 5 and the longitudinal reinforcement pipe 42 is small. When both longitudinal reinforcement pipes 42 are inserted into the longitudinal reinforcement 5, the ends of the two longitudinal reinforcement 5 will not touch and will have a certain amount of sliding. The two ends of the main pipe 41 are respectively provided with stirrup pipe 43 which is in communication with the main pipe 41. The stirrup pipe 43 is penetrated by the spiral stirrup 15, and the stirrup pipe 43 extends spirally to adapt to the extension direction of the spiral stirrup 15. The inner diameter of the stirrup pipe 43 is adapted to the outer diameter of the spiral stirrup 15. Here, the adaptation means that the spiral stirrup 15 can penetrate the stirrup pipe 43 and slide relative to the stirrup pipe 43 while the amount of shaking between the spiral stirrup 15 and the stirrup pipe 43 is small. It should be noted that in fact, the main pipe 41, the longitudinal reinforcement pipe 42 and the stirrup pipe 43 are an integral structure, which are artificially divided according to their different functions. Figure 11 Figure 12

[0054] Because the spiral stirrup 15 penetrates the longitudinal reinforcement joint 4, the spiral stirrup 15 is continuous.

[0055] In this embodiment, all longitudinal reinforcement joints 4 in the four longitudinal reinforcement assembly 3 are located at different heights, so that the spiral stirrup 15 can be arranged spirally in the up-down direction.

[0056] ​​Since the longitudinal bar joint 4 and the longitudinal bar 5 can be adjusted in length and the spiral stirrup 15 is arranged in spiral extending along the up and down direction, when the four longitudinal bar assemblies 3 are away from each other, the spiral stirrup 15 expands in diameter along with the longitudinal bar assemblies 3 being stretched, and the spiral stirrup 15 pulls each longitudinal bar joint 4 to slide up and down at the same time, and the longitudinal bar 5 is continuously inserted into the longitudinal bar joint 4, so that the length of the longitudinal bar assembly 3 becomes smaller. The spiral stirrup 15 slides relative to the longitudinal bar joint 4 at the same time of expanding in diameter, the axial length of the spiral stirrup 15 becomes smaller, and the spiral extending arrangement of the spiral stirrup 15 along the up and down direction is maintained.

[0057] As shown in Figure 1 Fig. 1, the four longitudinal bar assemblies 3 at the top are connected by the four transverse bars 7 through the T-shaped joints 6. Specifically, each transverse bar 7 is a circular arc stirrup, and the T-shaped joint 6 has two transverse interfaces and one longitudinal interface. The uppermost longitudinal bar 5 in each longitudinal bar assembly 3 is inserted into the longitudinal interface of the T-shaped joint 6, and the corresponding two transverse bars 7 are inserted into the transverse interfaces, respectively. The transverse bar 7 can slide relative to the T-shaped joint 6 after being inserted into the T-shaped joint 6, so that the diameter of the virtual circle formed by each transverse bar 7 and each T-shaped joint 6 can be adjusted and changed.

[0058] It should be noted that in order to adapt to the arc extending of the transverse bar 7, the two transverse interfaces of the T-shaped joint 6 also extend in arc shape.

[0059] The connection mode of the four transverse bars 7 at the bottom and the connection mode of the four transverse bars 7 at the bottom and the longitudinal bar assembly 3 are consistent with those of the four transverse bars 7 at the top, and will not be described here.

[0060] In order to adjust the overall outer diameter of the reinforcement cage, it is necessary to change the diameters of the virtual circle where the four longitudinal bar assemblies 3 are located and the virtual circle where the four transverse bars 7 are located. Therefore, the reinforcement cage further comprises a stretching structure 8 at the top and the bottom. The stretching structure 8 at the top is used to stretch the four transverse bars 7 at the top, and the stretching structure 8 at the bottom is used to stretch the four transverse bars 7 at the bottom.

[0061] The supporting structure 8 includes a base 9 and four telescopic rods 10 installed on the side of the base 9. The four telescopic rods 10 are evenly distributed circumferentially on the base 9, and each of the four telescopic rods 10 corresponds to one of the four T-joints 6. The telescopic rods 10 extend radially and include a fixed sleeve fixed to the base 9 and a push rod telescopically assembled in the fixed sleeve. The push rod is fixed to the T-joint 6. In use, when the four push rods extend from the fixed sleeve, they can drive the T-joint 6 to move radially outward. At the same time as the T-joint 6 moves radially outward, the transverse ribs 7 slide inside the T-joint 6, and the length of the transverse ribs 7 exposed outside the T-joint 6 increases, thereby expanding the diameter, and the four longitudinal rib assemblies 3 move away from each other. It should be noted that in actual construction operations, after the push rod is pulled out of the fixed sleeve, in order to prevent the push rod from retracting again, welding can be performed at the joint position of the push rod and the fixed sleeve after the push rod is pulled out; or a rope or other structure can be used to hold the T-joint 6.

[0062] The bottom support structure 8 has the same structure as the top support structure 8, so it will not be described again here. The bottom support structure 8 needs to be pre-adjusted before being lowered into the pile hole 1.

[0063] like Figure 1 , Figure 2 As shown, the base 9 is an annular base. The variable diameter pile-forming device also includes a grouting pipe 11. The grouting pipe 11 passes through and is fixed in the base 9 within the top supporting structure 8. Specifically, the grouting pipe 11 is welded to the base 9. The grouting pipe 11 extends vertically and is located at the center of the reinforcing cage. There is a gap between the bottom of the grouting pipe 11 and the bottom supporting structure 8, meaning the bottom of the grouting pipe 11 does not extend to the bottom supporting structure 8. The top of the grouting pipe 11 has a grouting port 12, and the bottom of the grouting pipe 11 is open.

[0064] The side wall of the grouting pipe 11 is provided with grouting outlets through which the grout flows out during grouting. It should be noted that the number and height of the grouting outlets on the grouting pipe 11 can be changed and adjusted. In this embodiment, there are two symmetrical grouting outlets at the same height in the grouting pipe 11. A cover 18 is installed at each grouting outlet, and the cover 18 can close the grouting outlet. The upper end of the cover 18 is hinged to the grouting pipe 11 and can open and close the grouting outlet. Specifically, the upper end of the cover 18 and the grouting pipe are both provided with pin hole, the pin holes of the cover 18 and the grouting pipe 11 are correspondingly connected, the pin hole of the grouting pipe 11 extends to the outside of the grouting pipe, and during assembly, the pin is inserted into the pin holes of the cover 18 and the grouting pipe 11. In the initial state, the cover 18 closes the respective grouting outlet. During grouting, the cover 18 is pressed open by the grout. It should be noted that during grouting, the grout enters the grouting pipe 11 through the grouting outlet 12, and the grout gradually fills the grouting pipe 11. When the liquid level of the grout in the grouting pipe 11 reaches the height of the cover 18, the cover 18 will be pressed open, that is, during actual grouting, each cover 18 on the grouting pipe 11 is opened from bottom to top in turn.

[0065] As shown in Figure 1 and Figure 5 , the spiral precast pile tip 17 is fixed on the base 9 of the strutting structure 8 at the bottom, specifically, the spiral precast pile tip 17 is a concrete prefabricated part, and a threaded column 171 protruding upward is embedded therein. An internal thread is formed in the inner hole of the base 9, and the threaded column 171 is screw-fitted on the base 9.

[0066] The cloth bag 14 is sleeved on the outside of the reinforcement cage, as shown in Figure 1 , lateral ring hooks 13 are fixed on the outside of the T-shaped joint 6, the outside of the longitudinal reinforcement joint 4, and the base 9 at the top and the base 9 at the bottom, and the inside of the cloth bag 14 is fixed with a connecting ring 16, which is hung on the corresponding lateral ring hook 13, so as to fix the cloth bag 14 on the outside of the reinforcement cage. As shown in Figure 3 , the lateral ring hook 13 has an opening towards the center position of the reinforcement cage, the connecting ring 16 is hung on the lateral ring hook 13 through the opening, and the outside part of the lateral ring hook 13 can prevent the connecting ring 16 from being pulled out of the lateral ring hook 13.

[0067] The cloth bag 14 is a geotextile bag, which has the characteristics of high strength, good ductility, corrosion resistance, good water resistance, etc. The cloth bag 14 covers the entire reinforcement cage, prevents external water from seeping in, and can protect the steel bars in the reinforcement cage, while the reinforcement cage can support the cloth bag 14. As shown in Figure 5 , due to the threaded column protruding upward at the top of the spiral precast pile tip 17, the bottom of the cloth bag 14 can be located between the spiral precast pile tip 17 and the base 9 at the bottom, so that the cloth bag 14 can wrap the bottom of the reinforcement cage.

[0068] The on-site construction will use a grab crane 19 such as Figure 6 and Figure 7 The grab part of the grab crane 19 includes a rotator 20, the output end of the rotator 20 is provided with an extender 21, the output end of the extender 21 can be raised and lowered, the output end of the extender 21 is provided with a plurality of grabbers 22, and the plurality of grabbers 22 are distributed in the circumferential direction. The grabbers 22 can grab the cross ribs 7.

[0069] The use steps of the present application are as follows:

[0070] I. After the steel casing 2 is buried, the pile hole 1 is formed by drilling.

[0071] II. After the drilling is completed, the designed variable-diameter pile-forming device is placed in, wherein the reinforcement cage is assembled, the outer diameter is adjusted according to the diameter of the pile hole 1, after the adjustment, the opening structure 8 at the bottom is fixed, then the cloth bag 14 is installed, and the spiral prefabricated pile tip 17 is also fixed at the bottom of the reinforcement cage.

[0072] III. The top of the reinforcement cage is grabbed by the grab crane 19, and the whole reinforcement cage is rotated, so that the spiral prefabricated pile tip 17 rotates into the bearing layer, and after the variable-diameter pile-forming device is lowered into the pile hole 1, the opening structure 8 at the top is opened to open the top of the reinforcement cage.

[0073] IV. The pouring of concrete (slurry) is carried out through the grouting port 12, after the grouting is completed, the inside of the variable-diameter pile-forming device is filled with concrete, and a pile foundation 24 is formed, as shown in Figure 10 , a plurality of pile foundations 24 are supported on the pile cap 23.

[0074] Embodiment 2 of the variable-diameter pile-forming device provided by the present application:

[0075] The main difference between the embodiment 1 and the embodiment 2 is that in the embodiment 1, the variable-diameter pile-forming device is suitable for the pile hole without a cavity in the hole wall, and the outer diameters of the formed pile foundations are consistent.

[0076] In this embodiment, as shown in Figure 13 and Figure 14 An outwardly expandable deformable stirrup 25 is installed on the longitudinal reinforcement assembly, the two ends of the deformable stirrup 25 are fixed on the longitudinal reinforcement assembly, the deformable stirrup 25 can be elastically deformed outwardly, and the deformable stirrup 25 is externally fixed with the cloth bag 14. In this embodiment, the cloth bag 14 only wraps the deformable stirrup 25, the deformable stirrup 25 expands the cloth bag 14 outwardly, and the cloth bag 14 protects the deformable stirrup 25.

[0077] In use, the deformable stirrup 25 is lowered into the pile hole with the reinforcement cage, the deformable stirrup 25 automatically enters the cavity 26, and when grouting is performed later, the concrete enters the cloth bag 14, so as to fill the cavity with the concrete to form part of the pile foundation 24.

[0078] This embodiment is applicable to situations where there is little water in the pile hole. In fact, even without the cloth bag 14, it can still be used as long as the deformable stirrup 25 enters the cavity 26.

[0079] Embodiment 3 of the variable diameter pile driving device provided by the present invention:

[0080] The main difference between it and Example 2 is that in Example 2, only the deformable stirrup 25 is wrapped with a cloth bag 14.

[0081] In this embodiment, as Figure 15 As shown, the bag 14 encloses the entire steel cage, including the deformable stirrups 25.

[0082] Embodiment 4 of the variable diameter pile-forming device provided by the present invention:

[0083] The main difference between it and Example 1 is that in Example 1, the variable diameter pile forming device is suitable for pile holes without corrosive strata, and the outer diameter of the resulting piles is consistent.

[0084] In this embodiment, the variable diameter pile-forming device is suitable for special geological formations, such as corrosive formations, where, although there is no cavity inside the pile hole, it is necessary to enhance the bearing capacity of the pile foundation. Figure 16 As shown, deformable stirrups 25 are fixed to the outside of the longitudinal reinforcement assembly, and a cloth bag 14 is wrapped around the outside of the deformable stirrups 25. After grouting, the cloth bag 14 expands outward to form a protrusion, thereby improving the bearing capacity of the pile foundation.

[0085] It should be noted that in this embodiment, the soil layer at a certain location of the pile hole is corrosive and there is little water in the hole, so the bag 14 is only set at the corrosive soil layer.

[0086] Embodiment 5 of the variable diameter pile driving device provided by the present invention:

[0087] The main difference between it and Example 4 is that in Example 4, deformable stirrups are only provided at one location of the longitudinal reinforcement assembly.

[0088] In this embodiment, as Figure 17 As shown, the longitudinal reinforcement assembly is provided with multiple deformable stirrups 25 on the outside, and each deformable stirrup is wrapped with a cloth bag 14.

[0089] Embodiment 6 of the variable diameter pile-forming device provided by the present invention:

[0090] The main difference between it and Example 1 is that in Example 1, the base of the top support structure is an annular base, and the grouting pipe passes through and is fixed in the annular base.

[0091] In the embodiment, the base of the expansion structure at the top is no longer provided with a central hole, and the grouting pipe can pass downward through the two adjacent telescopic rods.

[0092] Embodiment 7 of the variable-diameter piling device provided by the application is as follows:

[0093] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the expansion structure comprises a central base and a plurality of telescopic rods arranged on the base.

[0094] In the embodiment, the reinforcement cage comprises a main rod arranged at a central position and extending upward and downward, and the expansion structure comprises an annular seat slidably arranged on the main rod, and the annular seat and each longitudinal reinforcement assembly are connected through a connecting rod, and the expansion manner is similar to an umbrella.

[0095] In other embodiments, the expansion structure comprises a central base and a plurality of expansion members arranged on the base, the expansion member comprises a first threaded rod, a second threaded rod and a threaded sleeve, the first threaded rod is fixed on the base, the second threaded rod is fixed on the T-shaped joint, one end of the threaded sleeve is sleeved on the outside of the first threaded rod and threadedly matched with the first threaded rod, the other end of the threaded sleeve is sleeved on the outside of the second threaded rod and threadedly matched with the second threaded rod, and the screw rotation directions of the first threaded rod and the second threaded rod are opposite. In use, the T-shaped joint can be driven to move away from the base by rotating the threaded sleeve, so as to realize the diameter expansion.

[0096] In addition, in the description of the specification, the meaning of “a plurality of” is at least two, for example, two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A variable-diameter pile-forming device, comprising: a plurality of longitudinal bar assemblies (3) arranged in a circumferential direction; a spiral stirrup (15) spirally wound on each longitudinal bar assembly (3) in an up-down direction; a distraction structure (8) for driving each longitudinal bar assembly (3) away from each other to expand the diameter; characterized in that: each longitudinal bar assembly (3) comprises a plurality of longitudinal bars (5) arranged in an up-down direction, and further comprises a longitudinal bar joint (4) located between any two adjacent longitudinal bars (5), and the end of each longitudinal bar (5) is slidably inserted into the corresponding longitudinal bar joint (4) in the up-down direction; the longitudinal bar joint (4) is located at the intersection of the spiral stirrup (15) and the longitudinal bar assembly (3), the spiral stirrup (15) penetrates each longitudinal bar joint (4) and is slidable relative to the longitudinal bar joint (4), when the distraction structure (8) drives each longitudinal bar assembly (3) away from each other to expand the diameter, the spiral stirrup (15) slides relative to the longitudinal bar joint (4) and drives the longitudinal bar joint (4) to move in the up-down direction to increase the depth of the longitudinal bar (5) inserted into the longitudinal bar joint (4) and thus shorten the length of the longitudinal bar assembly (3); the longitudinal bar joint (4) comprises a main pipe (41) extending in the up-down direction, the spiral stirrup (15) penetrates the main pipe (41), and the up-down ends of the main pipe (41) are respectively provided with longitudinal bar insertion pipes (42), and the longitudinal bar (5) is slidably inserted into the corresponding longitudinal bar insertion pipe (42); the outer diameter of the longitudinal bar insertion pipe (42) is smaller than the outer diameter of the main pipe (41); the two sides of the main pipe (41) are further provided with stirrup penetrating pipes (43), the stirrup penetrating pipes (43) are in communication with the main pipe (41), and the spiral stirrup (15) is slidably penetrated through the stirrup penetrating pipes (43); the distraction structure (8) is provided with two distraction structures and is separately arranged at the top and bottom of the longitudinal bar assembly (3), the distraction structure (8) comprises a base (9) located at the center and a telescopic rod (10) provided on the base (9), the number of the telescopic rod (10) is equal to the number of the longitudinal bar assembly (3) and is connected one by one, and each telescopic rod (10) of the distraction structure (8) is used to drive each longitudinal bar assembly (3) to separate from each other.

2. The variable-diameter piling device of claim 1, wherein The variable-diameter pile-forming device comprises a cross bar (7) connecting any two adjacent longitudinal bar assemblies (3), and the cross bar (7) is located at the top and bottom of each longitudinal bar assembly (3); the top and bottom of each longitudinal bar assembly (3) is provided with a T-shaped joint (6), the T-shaped joint (6) has a longitudinal interface for inserting the longitudinal bar assembly (3), and the T-shaped joint (6) further has two transverse interfaces, and the cross bar (7) is slidably inserted into the corresponding transverse interface; the telescopic rod (10) is connected to the corresponding T-shaped joint (6).

3. A variable-diameter piling device according to claim 2, wherein The base (9) of the distraction structure (8) located at the top is a ring-shaped base, a grouting pipe (11) is fixedly penetrated in the ring-shaped base, a side of the grouting pipe (11) is provided with a grout outlet, a cover (18) is hingedly connected to the grout outlet, the cover (18) is used to close when the variable-diameter pile-forming device is lowered, and the cover (18) is also used to be opened by the grout when grouting.

4. A variable-diameter piling device according to claim 3, wherein The longitudinal rib joint (4), the T-shaped joint and the base (9) are all provided with a first connecting member; The variable-diameter pile-forming device further comprises a cloth bag (14) wrapped outside all the longitudinal rib assemblies (3), and a second connecting member is fixedly arranged in the cloth bag (14) and is hooked on the first connecting member.

5. A variable-diameter piling device according to claim 4, wherein The variable-diameter pile-forming device further comprises a spiral prefabricated pile tip (17) arranged at the bottom, and the spiral prefabricated pile tip (17) comprises a threaded column (171) arranged at a central position and protruding upward, and the threaded column (171) is threadedly assembled on the base (9) of the bottom opening structure (8).

6. The variable-diameter piling apparatus of claim 1, wherein, The variable-diameter pile-forming device comprises a deformable supporting rib (25) arranged outside the longitudinal rib assembly (3), and the deformable supporting rib (25) is used for deforming outward to press against the hole wall of the pile hole (1) or extend into a cavity (26) in the hole wall of the pile hole (1).

7. A variable-diameter piling device according to claim 6, wherein The variable-diameter pile-forming device comprises a cloth bag (14) wrapped outside at least the deformable supporting rib (25).

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