Combined sleeve spiral steel pile

Abstract

The utility model discloses a combined sleeve spiral steel pile which comprises a small-diameter steel pile provided with small-diameter blades and a large-diameter steel pile provided with large-diameter blades, a top connecting piece is arranged at the top of the small-diameter steel pile, a bottom connecting piece is arranged at the bottom of the large-diameter steel pile, and a top plate is arranged at the top of the large-diameter steel pile. The small-diameter steel pile and the large-diameter steel pile have a first combined state and a second combined state, and in the first combined state, the bottom connecting piece and the top connecting piece are connected through a separable one-way rotation limiting structure, so that when the large-diameter steel pile rotates, the small-diameter steel pile is driven to rotate through the one-way rotation limiting structure; in the second combination state, the top of the small-diameter steel pile is inserted into the large-diameter steel pile, and the top connecting piece and the top plate are in butt joint and fixed together through the fastening assembly. According to the combined sleeve spiral steel pile, the combined sleeve spiral steel pile is used for jointly sharing load force transmitted by an upper component, so that the bearing limit of the steel pile is greatly improved, and the bending resistance of the steel pile on the earth surface is also enhanced.

Description

[Technical field]

[0001] The utility model belongs to the technical field of photovoltaics, and in particular relates to a spiral steel pile for a photovoltaic support. [Background technology]

[0002] With the development of the photovoltaic industry, when installing household photovoltaic power stations, in order to adapt to more complex and changeable house types, it is necessary to develop brackets with larger spans. At the same time, higher requirements are placed on the foundation performance of the spiral steel piles used. The safety and efficiency of installing steel piles are the key issues of common concern in the photovoltaic industry and even the construction industry. At present, there are the following problems in the installation of steel piles:

[0003] First, the cost is high and materials are wasted. Since the diameter of the steel pile is uniform, after the steel pile is driven into the ground, due to the effect of the blades, the influence of the upper force-applying components on the steel pile decreases with the depth. The deeper the steel pile is drilled, the less likely it is to be affected by the upper force-applying components. Therefore, under the premise that the diameter of the steel pile remains unchanged, the closer to the pile tip, the greater the degree of material waste;

[0004] Second, the ultimate bearing capacity is still insufficient. The uniform diameter of steel piles not only leads to the waste of materials near the pile tip, but also makes it impossible to improve the ultimate bearing capacity of the area close to the ground due to the influence of pile diameter and thickness;

[0005] Third, the fault tolerance rate is low. The steel pile may tilt during the piling process, which requires leveling and installation according to the surface conditions of the pile top when connecting with the upper components;

[0006] Fourth, the construction is difficult. Since the blades of steel piles are uniform, the difficulty of piling increases with the increase of piling depth. Even if the blades are designed to increase in diameter from the tip to the top of the pile, the increase of linked blades will still cause the problem of difficulty in piling. [Utility Model Content]

[0007] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a combined sleeve spiral steel pile to solve the problem of insufficient ultimate bearing capacity.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] First, a combined sleeve spiral steel pile is provided, comprising a small-diameter steel pile with a small-diameter blade and a large-diameter steel pile with a large-diameter blade, wherein a top connecting piece is provided on the top of the small-diameter steel pile, a bottom connecting piece is provided on the bottom of the large-diameter steel pile, and a top plate is provided on the top of the large-diameter steel pile; the small-diameter steel pile and the large-diameter steel pile have a first combined state and a second combined state,

[0010] In the first combined state, the bottom connecting member and the top connecting member are connected via a detachable one-way rotation limiting structure, so that when the large-diameter steel pile rotates, the one-way rotation limiting structure drives the small-diameter steel pile to rotate;

[0011] In the second combined state, the top of the small-diameter steel pile is inserted into the large-diameter steel pile, and the top connecting piece is butted against the top plate and fixed together by a fastening assembly.

[0012] Preferably, the one-way rotation limiting structure includes a limiting groove provided on the bottom connecting member, a guide piece and a limiting rib provided on the top connecting member, the guide piece extends in the circumferential direction and one end is connected to the limiting rib, when the limiting groove and the guide piece are in corresponding positions, the limiting groove and the guide piece are engaged through the relative rotation of the bottom connecting member and the top connecting member, and when the limiting groove and the limiting rib are in limited cooperation, continuing to rotate the large diameter steel pile drives the small diameter steel pile to rotate.

[0013] Preferably, the one-way rotation limiting structure also includes a plurality of bottom dowels provided on the bottom connecting member and evenly distributed along the circumferential direction, and a plurality of top slots provided on the top connecting member and evenly distributed along the circumferential direction, the bottom dowels correspond to the top slots one by one and are inserted into each other up and down, the limiting slots are provided on the bottom dowels, and the guide plates are provided on both sides of the circumference of the top slots.

[0014] Preferably, a guiding slope is provided on the outer side of the bottom of the bottom dowel.

[0015] Preferably, a fixing column is provided on the upper part of the bottom dowel, and the fixing column is fixed to the inner side of the large-diameter steel pile. A limiting step is provided between the upper outer side of the guide slope and the fixing column, and the limiting step cooperates with the bottom end limiting position of the large-diameter steel pile.

[0016] Preferably, the fastening assembly includes a bolt, and the bolt includes a screw rod arranged at the center of the top connecting piece. A through hole is provided on the top plate, and the screw rod passes through the through hole and is connected with a nut.

[0017] Preferably, a plurality of connecting ribs are distributed circumferentially of the screw rod, and the connecting ribs connect the screw rod and the side wall of the small-diameter steel pile.

[0018] Preferably, a pad assembly is provided between the nut and the top plate.

[0019] Preferably, the top connecting piece is welded to the top of the small-diameter steel pile, and the bottom connecting piece is welded to the bottom of the large-diameter steel pile.

[0020] Preferably, the small-diameter steel pile is longer than the large-diameter steel pile.

[0021] The utility model adopts the above-mentioned small-diameter steel pile and large-diameter steel pile to form a combined sleeve spiral steel pile, which has the following beneficial effects:

[0022] 1. Improve the ultimate bearing capacity: Combined sleeve spiral steel piles are used to share the load force transmitted by the upper components, namely the pressure and pull-out force. Especially in the upper area with greater stress, large-diameter steel piles with thicker and larger blades are used to improve the ultimate bearing capacity of the area close to the ground, greatly improving the bearing limit of the steel piles and enhancing the bending resistance of the steel piles on the surface;

[0023] Higher material utilization rate: The upper area of ​​the combined sleeve spiral steel pile with greater stress only uses large-diameter steel piles with higher bearing capacity, and the lower area with less stress only uses small-diameter steel piles that meet the requirements. In this way, the steel pile materials are reasonably allocated according to the stress characteristics, which improves the material utilization rate and steel pile performance, and can also reduce costs;

[0024] High fault tolerance rate: Since small-diameter steel piles are installed first, if the steel piles are found to be offset after being driven in, they can be corrected when large-diameter steel piles are used, which improves the fault tolerance rate of steel piles;

[0025] Convenient construction: Small-diameter steel piles with thinner and smaller blades are easier to increase the piling depth. Compared with equal-diameter steel piles with the same number of blades in the prior art, the combined sleeve spiral steel piles are driven into the small-diameter steel piles first, and the large-diameter steel piles are installed separately at the end. The large-diameter steel piles are driven into a shallow depth. Since the blades are driven in batches, the construction difficulty of the small-diameter steel piles is relatively small, which reduces the construction difficulty;

[0026] Convenient transportation: Large-diameter steel piles and small-diameter steel piles can be transported in the second combined state, which reduces the difficulty of transportation.

[0027] 2. The one-way rotation limit structure adopted by the utility model, when the position of the limit groove corresponds to the position of the guide piece, the limit groove and the guide piece are engaged through the relative rotation of the bottom connecting piece and the top connecting piece, and when the limit groove and the limit rib are limited and matched, the large diameter steel pile is continued to rotate to drive the small diameter steel pile to rotate. Since the limit groove and the guide piece cooperate to guide the relative rotation of the bottom connecting piece and the top connecting piece, under the limiting action of the one-way rotation limit structure, it is not only convenient for the large diameter steel pile to drive the small diameter steel pile to rotate, but also convenient for reverse rotation to realize the separation of the one-way rotation limit structure between the bottom connecting piece and the top connecting piece.

[0028] 3. Since the bottom dowel bar corresponds to the top slot one by one and is inserted up and down, the limit groove is arranged on the bottom dowel bar, and the guide piece is arranged on both sides of the circumference of the top slot. In this way, when the small-diameter steel pile and the large-diameter steel pile are combined, the bottom dowel bar corresponds to the top slot up and down, and then the large-diameter steel pile moves downward to make the position of the limit groove correspond to the position of the guide piece. Then the large-diameter steel pile is rotated to realize the coordination between the limit groove and the guide piece and the coordination between the limit groove and the limit bar, which facilitates the position correspondence between the limit groove and the guide piece.

[0029] In addition, the one-way rotation limiting structure of the combined steel pile adopts the internal bite of the components as the combination method, and there is no need to add other fixing parts, which is convenient for combination.

[0030] 4. Since a guiding slope is provided on the bottom outer side of the bottom dowel, after the bottom dowel is aligned with the bottom slot up and down, the large-diameter steel pile is moved downward, and the bottom dowel can be easily inserted into the top slot.

[0031] 5. The fixing column is fixed on the inner side of the large-diameter steel pile, and a limiting step is provided between the outer side of the upper end of the guiding slope and the fixing column. Therefore, when installing the bottom connecting piece on the large-diameter steel pile, as long as the limiting step cooperates with the bottom end limiting of the large-diameter steel pile, the axial position of the bottom connecting piece can be guaranteed, so that the limiting grooves of all the bottom dowels are at the same height and cooperate with the guide piece.

[0032] 6. The fastening assembly adopts bolts, wherein the bolts include a screw rod arranged at the center of the top connecting piece, and a through hole is provided on the top plate. In this way, after the large-diameter steel pile moves downward and the top of the small-diameter steel pile is inserted into the large-diameter steel pile, the screw rod naturally passes through the through hole and a nut is connected above the through hole, which is convenient for fixing through the fastening assembly.

[0033] 7. The connecting ribs connect the screw and the side wall of the small-diameter steel pile to ensure the strength of the screw and also improve the overall structural strength of the top connector.

[0034] 8. A backing plate assembly is provided between the nut and the top plate, which can effectively prevent the nut from loosening and improve the reliability of the fastening assembly.

[0035] 9. The top connecting piece is welded to the top of the small-diameter steel pile, and the bottom connecting piece is welded to the bottom of the large-diameter steel pile. The welding connection is reliable and easy to fix.

[0036] 10. The length of small-diameter steel piles is greater than that of large-diameter steel piles. Combined sleeve spiral steel piles are conducive to bringing out the respective advantages of small-diameter steel piles and large-diameter steel piles, because it is easier to increase the piling depth by using thinner and smaller-blade steel piles; and the large-diameter steel piles are finally installed separately, with a smaller length and a shallower driving depth, which reduces the construction difficulty of large-diameter steel piles.

[0037] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0038] The utility model is further described below in conjunction with the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the structure of large-diameter steel piles and small-diameter steel piles before assembly;

[0040] Figure 2 is an axial cross-sectional view of the bottom connecting piece;

[0041] Figure 3 is an axial cross-sectional view of the top connecting piece;

[0042] Figure 4 is a radial cross-sectional view of the bottom connecting member;

[0043] Figure 5 is a radial cross-sectional view of the top connecting member;

[0044] Figure 6 This is a schematic diagram of the combined structure of large-diameter steel piles and small-diameter steel piles before construction;

[0045] Figure 7 for Figure 6 The enlarged structural diagram at A in the middle;

[0046] Figure 8 This is a schematic diagram of the combined structure of large-diameter steel piles and small-diameter steel piles after installation;

[0047] Fig. 9 for Figure 8 The enlarged structural diagram at B in the middle;

[0048] Figure numerals: small diameter steel pile 1, top connecting piece 11, screw 111, connecting rib 112, guide piece 113, top slot 114, small diameter blade 12, large diameter steel pile 2, bottom connecting piece 21, bottom dowel 211, guide slope 2111, fixing column 2112, limiting step 2113, limiting groove 2114, large diameter blade 22, top plate 23, nut 24, large diameter pad 25, small diameter pad 26, washer 27. [Specific implementation method]

[0049] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0050] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0051] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the following words indicating orientation or positional relationship, such as "upper", "lower", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0052] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Reference Figures 1 to 9 As shown, this embodiment provides a combined sleeve spiral steel pile, which is used to solve the problems of high steel pile cost, low material utilization rate, and great construction difficulty during piling. It includes a small-diameter steel pile 1 provided with a small-diameter blade 12 and a large-diameter steel pile 2 provided with a large-diameter blade 22. The small-diameter steel pile 1 and the large-diameter steel pile 2 are both sleeve structures, and the diameter of the small-diameter steel pile 1 is smaller than the diameter of the large-diameter steel pile 2, and the diameter of the small-diameter blade 12 is smaller than the diameter of the large-diameter blade 22. The specific sizes of the small-diameter steel pile 1 and the large-diameter steel pile 2 can be selected and adjusted as needed. A top connector 11 is provided at the top of the small-diameter steel pile 1, a bottom connector 21 is provided at the bottom of the large-diameter steel pile 2, and a top plate 23 is provided at the top of the large-diameter steel pile 2.

[0056] The small-diameter steel pile 1 and the large-diameter steel pile 2 have a first combination state and a second combination state:

[0057] like Figure 6 and Figure 7As shown, the first combination state is when the small-diameter steel pile is driven in. In the first combination state, the large-diameter steel pile 2 and the small-diameter steel pile 1 need to rotate synchronously. The bottom connecting member 21 is connected to the top connecting member 11, and a separable one-way rotation limiting structure is provided between the bottom connecting member and the top connecting member. When the large-diameter steel pile rotates clockwise, the small-diameter steel pile is driven to rotate through the one-way rotation limiting structure, but the large-diameter steel pile does not drive the small-diameter steel pile to rotate when it rotates clockwise, and the one-way rotation limiting structure between the bottom connecting member and the top connecting member can be separated.

[0058] like Figure 8 and Fig. 9 As shown, the second combination state is that after the large-diameter steel pile is driven in alone, it needs to be combined and fixed with the small-diameter steel pile. In the second combination state, the one-way rotation limit structure of the bottom connecting member and the top connecting member has been separated, the top of the small-diameter steel pile 1 is inserted into the large-diameter steel pile 2, and the top connecting member 11 is docked with the top plate 23 and fixed together by a fastening assembly.

[0059] The utility model adopts the above-mentioned small-diameter steel pile and large-diameter steel pile to form a combined sleeve spiral steel pile, which has the following beneficial effects:

[0060] Improve the ultimate bearing capacity: Combined sleeve spiral steel piles are used to share the load force transmitted by the upper components, namely the pressure and pull-out force. In particular, large-diameter steel piles with thicker and larger blades are used in the upper area with greater stress, thereby improving the ultimate bearing capacity of the area close to the ground, greatly improving the bearing limit of the steel piles, and also enhancing the bending resistance of the steel piles on the surface;

[0061] Higher material utilization rate: The upper area of ​​the combined sleeve spiral steel pile with greater stress only uses large-diameter steel piles with higher bearing capacity, and the lower area with less stress only uses small-diameter steel piles that meet the requirements. In this way, the steel pile materials are reasonably allocated according to the stress characteristics, which improves the material utilization rate and steel pile performance, and can also reduce costs;

[0062] High fault tolerance rate: Since small-diameter steel piles are installed first, if the steel piles are found to be offset after being driven in, they can be corrected when large-diameter steel piles are used, which improves the fault tolerance rate of steel piles;

[0063] Convenient construction: Small-diameter steel piles with thinner and smaller blades are easier to increase the piling depth. Compared with equal-diameter steel piles with the same number of blades in the prior art, the combined sleeve spiral steel piles are driven into the small-diameter steel piles first, and the large-diameter steel piles are installed separately at the end. The large-diameter steel piles are driven into a shallow depth. Since the blades are driven in batches, the construction difficulty of the small-diameter steel piles is relatively small, which reduces the construction difficulty;

[0064] Convenient transportation: Large-diameter steel piles and small-diameter steel piles can be transported in the second combined state, which reduces the difficulty of transportation.

[0065] As an embodiment, the one-way rotation limiting structure includes a plurality of bottom dowels 211 arranged on the bottom connecting member and evenly distributed along the circumferential direction, and a plurality of top slots 114 arranged on the top connecting member and evenly distributed along the circumferential direction. The bottom dowels 211 correspond to the top slots 114 one by one. The bottom dowels 211 are provided with limiting grooves 2114, and the sides of the top slots are provided with guide pieces 113 and limiting ribs. The limiting ribs extend axially, and the guide pieces 113 extend circumferentially and are connected to the limiting ribs. When the limiting grooves correspond to the guide pieces, the limiting grooves and the guide pieces are engaged through the relative rotation of the bottom connecting member and the top connecting member. When the limiting grooves cooperate with the limiting ribs, the large-diameter steel piles continue to rotate to drive the small-diameter steel piles to rotate. Since the limiting groove and the guide piece cooperate to guide the relative rotation of the bottom connecting part and the top connecting part, under the limiting action of the one-way rotation limiting structure, it is not only convenient for the large-diameter steel pile to drive the small-diameter steel pile to rotate, but also convenient for reverse rotation to realize the separation of the one-way rotation limiting structure between the bottom connecting part and the top connecting part. Since the bottom inserted bar corresponds to the top slot one by one and is inserted up and down, the limiting groove is arranged on the bottom inserted bar, and the guide piece is arranged on both sides of the circumference of the top slot. In this way, when the small-diameter steel pile and the large-diameter steel pile are combined, the bottom inserted bar corresponds to the top slot up and down, and then the large-diameter steel pile moves downward, so that the limiting groove corresponds to the guide piece position, and then the large-diameter steel pile is rotated, the limiting groove and the guide piece can be matched, and the limiting groove and the limiting rib can be matched, which facilitates the position correspondence between the limiting groove and the guide piece.

[0066] Furthermore, a guide slope 2111 is provided on the bottom outer side of the bottom dowel 211. A fixing column 2112 is provided on the upper part of the bottom dowel 211, and the fixing column 2112 is fixed to the inner side of the large-diameter steel pile. A limiting step 2113 is provided between the upper outer side of the guiding slope and the fixing column, and the limiting step cooperates with the bottom limit of the large-diameter steel pile. Since the guiding slope is provided, after the bottom dowel is aligned with the bottom slot up and down, the large-diameter steel pile is moved downward, and the bottom dowel is easily inserted into the top slot. When installing the bottom connector on the large-diameter steel pile, as long as the limiting step cooperates with the bottom limit of the large-diameter steel pile, the axial position of the bottom connector can be guaranteed, so that the limiting grooves of all the bottom dowels are at the same height and cooperate with the guide piece. In addition, since the one-way rotation limiting structure of the modular steel pile adopts the internal bite of the component as the combination method, there is no need to add other fixings, which is convenient for combination.

[0067] In this embodiment, the fastening assembly includes a bolt, and the bolt includes a screw rod 111 disposed at the center of the top connector. A through hole is provided on the top plate, and the screw rod 111 passes through the through hole and is connected with a nut 24. In this way, after the large-diameter steel pile moves downward and the top of the small-diameter steel pile is inserted into the large-diameter steel pile, the screw rod naturally passes through the through hole, and the nut is connected above the through hole, which is convenient for fixing by the fastening assembly.

[0068] Furthermore, the screw rod 111 is provided with a plurality of connecting ribs 112 distributed in the circumferential direction, and the connecting ribs 112 connect the screw rod and the side wall of the small-diameter steel pile. Specifically, the top of the small-diameter steel pile is provided with positioning grooves distributed in the circumferential direction, and the connecting ribs are arranged in one-to-one correspondence with the limiting ribs and are integrally arranged through the positioning grooves. That is, the connecting ribs 112 are integrally formed with the limiting ribs and are integrally welded with the positioning grooves, thereby improving the overall structural strength of the top connector.

[0069] Furthermore, a pad assembly is provided between the nut 24 and the top plate 23, and the pad assembly includes a large-diameter pad 25 and a small-diameter pad 26, the small-diameter pad 26 is provided on the upper side of the large-diameter pad 25, the thickness of the small-diameter pad 26 is also smaller than that of the large-diameter pad 25, and a washer 27 is provided between the nut and the small-diameter pad. Thus, the nut can be effectively prevented from loosening, and the reliability of the fastening assembly is improved.

[0070] Specifically, the top connector 11 is welded to the top of the small-diameter steel pile 1, that is, a plurality of bottom dowels are welded to the small-diameter steel pile. Of course, a plurality of bottom dowels can also be welded to an annular rib, and then welded to the small-diameter steel pile through the annular rib. The bottom connector 21 is welded to the bottom of the large-diameter steel pile 2, that is, the above-mentioned connecting rib is integrated with the limiting rib, and is welded and arranged integrally with the positioning groove. The welding method is not only reliable in connection, but also convenient for fixing.

[0071] It is understandable that the length of the small-diameter steel pile 1 is greater than that of the large-diameter steel pile 2. Such a combined sleeve spiral steel pile is conducive to giving full play to the advantages of small-diameter steel piles and large-diameter steel piles, because it is easier to increase the pile driving depth by using thinner and smaller blade steel piles; and the large-diameter steel piles are finally installed separately, and the length is smaller, and the driving depth is shallower, which reduces the construction difficulty of the large-diameter steel piles.

[0072] It is understandable that if Figure 1 and Figure 8 As shown, the distance L1 between the upper end surface of the top connector (excluding the screw) and the small-diameter blade below is greater than the distance L2 between the lower end surface of the bottom connector and the top plate, thereby ensuring that in the second combined state, the top connector 11 is docked with the top plate 23 and fixed together by the fastening assembly.

[0073] The installation method of the combined sleeve spiral steel pile comprises the following steps:

[0074] Step 1: Connect the bottom connecting piece and the top connecting piece through a one-way rotation limiting structure;

[0075] Step 2: Rotate the large diameter steel pile clockwise, and the large diameter steel pile will drive the small diameter steel pile to rotate clockwise downward, and stop when the bottom connecting piece is close to the ground;

[0076] Step 3: Rotate the large-diameter steel pile counterclockwise to separate the one-way rotation limit structure between the bottom connector and the top connector, and then move the large-diameter steel pile downward until the bottom connector is below the top connector, keeping it disengaged and freely rotatable;

[0077] Step 4: Rotate the large diameter steel pile clockwise downward until the top connector is butted against the top plate;

[0078] Step 5: Fasten the top connector and the top plate together using fasteners to complete the final installation.

[0079] Specifically, in the first step, the bottom dowel bar corresponds to the top slot one by one and is inserted up and down until the limit slot and the guide plate are on the same horizontal line, and then the large-diameter steel pile rotates clockwise to realize the one-way rotation limit structure. In the second step, the large-diameter steel pile drives the small-diameter steel pile to rotate clockwise downward, and stops when the bottom connector of the large-diameter steel pile is 10 cm from the ground. In the third step, the large-diameter steel pile is rotated counterclockwise, and when the bottom dowel bar corresponds to the top slot one by one, the one-way rotation limit structure between the bottom connector and the top connector is separated, and then the large-diameter steel pile moves downward until the bottom connector is under the top connector. In the fourth step, during the clockwise downward rotation of the large-diameter steel pile, the screw in the center of the top connector passes upward through the through hole. In the fifth step, the screw connects the pad assembly and the nut to complete the final installation.

[0080] The above-mentioned combined sleeve spiral steel pile adopts a segmented installation method, which is more convenient than the traditional installation method of piling construction.

[0081] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. A combined sleeve spiral steel pile, characterized in that: It comprises a small-diameter steel pile with a small-diameter blade and a large-diameter steel pile with a large-diameter blade, wherein a top connecting piece is provided at the top of the small-diameter steel pile, a bottom connecting piece is provided at the bottom of the large-diameter steel pile, and a top plate is provided at the top of the large-diameter steel pile; the small-diameter steel pile and the large-diameter steel pile have a first combination state and a second combination state, In the first combined state, the bottom connecting member and the top connecting member are connected via a detachable one-way rotation limiting structure, so that when the large-diameter steel pile rotates, the one-way rotation limiting structure drives the small-diameter steel pile to rotate; In the second combined state, the top of the small-diameter steel pile is inserted into the large-diameter steel pile, and the top connecting piece is butted against the top plate and fixed together by a fastening assembly.

2. A combined sleeve spiral steel pile according to claim 1, characterized in that: The one-way rotation limiting structure includes a limiting groove arranged on the bottom connecting member, a guide piece and a limiting rib arranged on the top connecting member, wherein the guide piece extends in the circumferential direction and one end is connected to the limiting rib. When the limiting groove and the guide piece are in corresponding positions, the limiting groove and the guide piece are engaged through the relative rotation of the bottom connecting member and the top connecting member, and when the limiting groove and the limiting rib are in limited cooperation, the large-diameter steel pile continues to rotate to drive the small-diameter steel pile to rotate.

3. A combined sleeve spiral steel pile according to claim 2, characterized in that: The one-way rotation limiting structure also includes a plurality of bottom ribs arranged on the bottom connecting member and evenly distributed along the circumferential direction, and a plurality of top slots arranged on the top connecting member and evenly distributed along the circumferential direction. The bottom ribs correspond to the top slots one by one and are inserted into each other up and down. The limiting grooves are arranged on the bottom ribs, and the guide plates are arranged on both sides of the circumference of the top slots.

4. The combined sleeve spiral steel pile according to claim 3, characterized in that: A guiding inclined surface is arranged on the outer side of the bottom of the bottom dowel.

5. The combined sleeve spiral steel pile according to claim 4, characterized in that: A fixing column is provided on the upper part of the bottom dowel, and the fixing column is fixed to the inner side of the large-diameter steel pile. A limiting step is provided between the upper outer side of the guiding slope and the fixing column, and the limiting step cooperates with the bottom end limiting of the large-diameter steel pile.

6. The combined sleeve spiral steel pile according to claim 1, characterized in that: The fastening assembly includes a bolt, and the bolt includes a screw rod arranged at the center of the top connecting piece. A through hole is arranged on the top plate, and the screw rod passes through the through hole and is connected with a nut.

7. The combined sleeve spiral steel pile according to claim 6, characterized in that: A plurality of connecting ribs are distributed around the screw rod, and the connecting ribs connect the screw rod and the side wall of the small-diameter steel pile.

8. The combined sleeve spiral steel pile according to claim 6, characterized in that: A backing plate assembly is provided between the nut and the top plate.

9. The combined sleeve spiral steel pile according to claim 1, characterized in that: The top connecting piece is welded to the top of the small-diameter steel pile, and the bottom connecting piece is welded to the bottom of the large-diameter steel pile.

10. The combined sleeve spiral steel pile according to claim 1, characterized in that: The length of the small-diameter steel pile is greater than that of the large-diameter steel pile.

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