A connecting structure of a c-shaped steel column and a cast-in-place pile and a construction method thereof

Abstract

The application discloses a connecting structure of a C-shaped steel column and a cast-in-place pile and a construction method thereof. The connecting structure of the C-shaped steel column and the cast-in-place pile comprises a steel reinforcement cage arranged in a pile hole; a C-shaped steel column, an insertion section of the C-shaped steel column being inserted into the steel reinforcement cage, the C-shaped steel column comprising a web plate and a pair of flanges, two insertion slots being sequentially arranged on the web plate and the pair of flanges along an axial direction of the C-shaped steel column; a first positioning screw rod and a second positioning screw rod, both of which are arranged along a radial direction of the steel reinforcement cage, the first positioning screw rod being arranged in the insertion slot on the web plate and both ends of the first positioning screw rod being fixed to the steel reinforcement cage, the second positioning screw rod being sequentially arranged in the insertion slots on the pair of flanges and both ends of the second positioning screw rod being fixed to the steel reinforcement cage, and the first positioning screw rod and the second positioning screw rod being sleeved with a first set of nuts to fix the C-shaped steel column. The application can improve the connecting stability of the C-shaped steel column and the cast-in-place pile and ensure the perpendicularity of the C-shaped steel column.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bored pile construction technology, and more particularly, to a connecting structure of a C-shaped steel column and a bored pile. BACKGROUND

[0002] The bored pile construction technology has been widely applied in the construction of various fields. In order to avoid the foundation settlement, the structure of the steel column and the bored pile is usually adopted to enhance the bearing capacity of the bored pile. The C-shaped steel column has better tensile strength, bending strength and plasticity. The C-shaped steel column is connected with the bored pile, and the concrete is poured to form a pile foundation. The application of this type of pile foundation is more and more widely.

[0003] However, the flange and the web of the C-shaped steel column are relatively thin, and the studs cannot be welded to enhance the connection strength of the connection joint with the concrete. The surface of the C-shaped steel column is smooth, and the friction coefficient between the C-shaped steel column and the concrete is small. The concrete at the top end of the C-shaped steel column is easily damaged, so that the C-shaped steel column is easily separated from the bored pile and the pile body of the bored pile is cracked. The overall stability of the connection between the C-shaped steel column and the bored pile is poor. In addition, during the construction process, the axis of the C-shaped steel column and the axis of the pile body are easily deviated and not on the same straight line. The perpendicularity of the C-shaped steel column is poor, so that the C-shaped steel column generates eccentric bending moment, which reduces the bearing capacity of the bored pile. The top end position of the C-shaped steel column deviates from the pre-installed position, and the beam or the bar cut according to the size of the drawing cannot be installed on the bored pile.

[0004] In summary, how to provide a connecting structure of a C-shaped steel column and a bored pile, which can improve the connection stability and ensure the perpendicularity of the C-shaped steel column, is a problem that needs to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a connecting structure of a C-shaped steel column and a bored pile, which can improve the connection stability and ensure the perpendicularity of the C-shaped steel column.

[0006] Another purpose of the present application is to provide a construction method applied to the connecting structure of the C-shaped steel column and the bored pile.

[0007] In order to achieve the above purpose, the present application provides the following technical scheme:

[0008] A connecting structure of a C-shaped steel column and a bored pile, comprising:

[0009] A steel reinforcement cage is arranged in the pile hole.

[0010] A C-shaped steel column, an insertion section of which is inserted into the reinforcement cage, the C-shaped steel column comprising a web and a pair of flanges, two insertion slots being sequentially arranged on the web and the pair of flanges along the axial direction of the C-shaped steel column; a first positioning screw rod and a second positioning screw rod, both of which are arranged along the radial direction of the reinforcement cage, the first positioning screw rod being arranged through the insertion slot on the web and both ends of which being fixed to the reinforcement cage, the second positioning screw rod being sequentially arranged through the insertion slots on the pair of flanges and both ends of which being fixed to the reinforcement cage, both of the first positioning screw rod and the second positioning screw rod being sleeved with a first set of nuts to fix the C-shaped steel column.

[0011] Preferably, the two insertion slots on the web and the pair of flanges are respectively arranged at both ends of the insertion section of the C-shaped steel column.

[0012] Preferably, a plurality of reinforcing screw rods are arranged through the web and the pair of flanges between both ends of the insertion section of the C-shaped steel column, each of the reinforcing screw rods being arranged along the radial direction of the reinforcement cage, and the plurality of reinforcing screw rods being equidistantly distributed along the axial direction of the C-shaped steel column.

[0013] Preferably, both ends of the reinforcing screw rod are fixed to the reinforcement cage.

[0014] Preferably, the reinforcement cage comprises a pair of longitudinal reinforcement bars and a spiral reinforcement bar arranged along the axial direction of the reinforcement cage, the spiral reinforcement bar being connected between the pair of longitudinal reinforcement bars, both ends of the first positioning screw rod and the second positioning screw rod being connected with the corresponding longitudinal reinforcement bars.

[0015] Preferably, the reinforcement cage further comprises a transverse reinforcement bar, the transverse reinforcement bar being connected between the top ends of the pair of longitudinal reinforcement bars along the radial direction of the reinforcement cage.

[0016] Preferably, the top end of the reinforcement cage protrudes out of the pile hole, and the insertion section of the C-shaped steel column is arranged outside the pile hole.

[0017] A construction method applied to the connecting structure of the C-shaped steel column and the cast-in-place pile according to any one of the preceding embodiments, the construction method comprising:

[0018] Preparation of the reinforcement cage and the C-shaped steel column;

[0019] Drilling the pile hole by using a drilling machine, inserting the reinforcement cage into the pile hole, and making the reinforcement cage coaxial with the pile hole;

[0020] Inserting the insertion section of the C-shaped steel column into the reinforcement cage, arranging the first positioning screw rod through the insertion slot on the web and connecting both ends of the first positioning screw rod with the reinforcement cage, sequentially arranging the second positioning screw rod through the insertion slots on the pair of flanges and connecting both ends of the second positioning screw rod with the reinforcement cage, and achieving the preliminary verticality of the C-shaped steel column;

[0021] moving the C-shaped steel column and moving it along the radial direction of the steel reinforcement cage until the C-shaped steel column is coaxial with the steel reinforcement cage, the C-shaped steel column reaches the required verticality, the first set of nuts are tightened at each of the insertion slots, and the C-shaped steel column is locked;

[0022] concreting the top end of the steel reinforcement cage, and after the concrete solidifies, a cast-in-place pile is formed.

[0023] The use process of the connecting structure of the C-shaped steel column and the cast-in-place pile provided by the application is as follows: the steel reinforcement cage is inserted into the pile hole and arranged coaxially with the pile hole, the insertion section (part of the C-shaped steel column) of the C-shaped steel column is inserted into the steel reinforcement cage, the other part of the C-shaped steel column protrudes from the steel reinforcement cage and is used for connecting a load-bearing beam or a stringer, two insertion slots are sequentially arranged on the web and a pair of flanges of the C-shaped steel column along the axial direction, a first positioning screw rod passes through the insertion slot on the web and is fixedly connected to the steel reinforcement cage at both ends, similarly, a second positioning screw rod sequentially passes through the insertion slots on the pair of flanges and is fixedly connected to the steel reinforcement cage at both ends, each positioning screw rod is arranged along the radial direction of the steel reinforcement cage, then the C-shaped steel column can move along the radial direction of the steel reinforcement cage on each positioning screw rod until the C-shaped steel column is coaxial with the steel reinforcement cage, the first set of nuts are tightened at each of the insertion slots, the C-shaped steel column is fixedly connected to each positioning screw rod, and thus the stable connection between the C-shaped steel column and the steel reinforcement cage is achieved, finally, concrete is poured into the top end of the steel reinforcement cage, and the concrete covers the steel reinforcement cage and the insertion section of the steel column to form a cast-in-place pile.

[0024] Thus, the C-shaped steel column is movably arranged in the steel reinforcement cage, so as to adjust the overlap of the axial line of the C-shaped steel column and the axial line of the steel reinforcement cage and improve the verticality of the C-shaped steel column, thereby avoiding the deformation of the C-shaped steel column due to eccentric bending moment and improving the compression bearing capacity of the C-shaped steel column, that is, improving the overall bearing capacity of the cast-in-place pile, and meanwhile, the C-shaped steel column is prevented from deviating from the pre-installed position, so as to facilitate the connection of the C-shaped steel column with the load-bearing beam or the stringer; in addition, the C-shaped steel column is stably connected to the steel reinforcement cage through the positioning screw bolt, the shear capacity of the connecting joint between the C-shaped steel column and the concrete is improved, and thus the C-shaped steel column is prevented from being deformed and falling out of the cast-in-place pile under compression, thereby improving the connection stability of the C-shaped steel column and the cast-in-place pile. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0026] Figure 1 It is a front view of the connecting structure of the C-shaped steel column and the cast-in-place pile provided by the application;

[0027] Figure 2 A side view of the connecting structure of the C-shaped steel column and the cast-in-place pile provided by the application;

[0028] Figure 3 A sectional view of A-A of Figure 1 ;

[0029] Figure 4 A sectional view of B-B of Figure 1 .

[0030] Figures 1-4 In the drawings, the reference signs include:

[0031] 1 is a cast-in-place pile, 2 is a C-shaped steel column, 3 is a steel reinforcement cage, 4 is a first positioning screw rod, 5 is a second positioning screw rod, 6 is a slot, 7 is a reinforcing screw rod, 8 is a first set of nuts, 9 is a second set of nuts, and 10 is a pile hole.

[0032] 21 is a web, and 22 is a flange.

[0033] 31 is a longitudinal reinforcement, 32 is a spiral stirrup, and 33 is a transverse stirrup. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without any creative work fall within the protection scope of the application.

[0035] The core of the application is to provide a connecting structure of a C-shaped steel column and a cast-in-place pile, which can improve the connection stability and ensure the perpendicularity of the C-shaped steel column.

[0036] Another core of the application is to provide a construction method applied to the connecting structure of the C-shaped steel column and the cast-in-place pile.

[0037] Please refer to Figures 1 to 4The application provides a connecting structure of a C-shaped steel column and a cast-in-place pile, which comprises a reinforcement cage 3 and a C-shaped steel column 2, wherein the reinforcement cage 3 is arranged in a pile hole 10; an insertion section of the C-shaped steel column 2 is inserted into the reinforcement cage 3, the C-shaped steel column 2 comprises a web 21 and a pair of flanges 22, the web 21 and the pair of flanges 22 are sequentially provided with insertion slots 6 in the axial direction of the C-shaped steel column 2; a first positioning screw 4 and a second positioning screw 5 are both arranged in the radial direction of the reinforcement cage 3, the first positioning screw 4 is arranged in the insertion slot 6 on the web 21 and both ends of the first positioning screw 4 are fixed to the reinforcement cage 3, the second positioning screw 5 is sequentially arranged in the insertion slots 6 on the pair of flanges 22 and both ends of the second positioning screw 5 are fixed to the reinforcement cage 3, and the first positioning screw 4 and the second positioning screw 5 are both sleeved with a first group of nuts 8 to fix the C-shaped steel column 2.

[0038] Specifically, the reinforcement cage 3 is inserted into the pile hole 10 and coaxially arranged with the pile hole 10, so that after the concrete is poured into the pile hole 10 to the top end of the reinforcement cage 3 to form the cast-in-place pile 1, the reinforcement cage 3 can bear force uniformly and the overall bearing capacity of the cast-in-place pile 1 is improved; in order to further improve the bearing capacity of the cast-in-place pile 1, a part (the insertion section) of the C-shaped steel column 2 is inserted into the reinforcement cage 3, and the other part of the C-shaped steel column 2 is used for connecting a load-bearing beam or a stringer, the C-shaped steel column 2 is composed of the web 21 and the pair of flanges 22 connected to both sides of the web 21, the web 21 and the pair of flanges 22 are provided with two insertion slots 6 in the axial direction thereof, one end of the first positioning screw 4 is welded to one side of the reinforcement cage 3 and the other end of the first positioning screw 4 is welded to the other side of the reinforcement cage 3 through the insertion slot 6 on the web 21, one end of the second positioning screw 5 is welded to one side of the reinforcement cage 3 and the other end of the second positioning screw 5 is sequentially welded to the other side of the reinforcement cage 3 through the insertion slots 6 on the pair of flanges 22, and it should be noted that the slot inner diameter of each insertion slot 6 is large, so that each insertion slot 6 releases the displacement degree of freedom of the steel column insertion section, so that the C-shaped steel column 2 can move along one positioning screw without being limited to move by the other positioning screw, so that the C-shaped steel column 2 can move in the radial direction of the reinforcement cage 3, so as to realize that the axis of the C-shaped steel column 2 coincides with the axis of the reinforcement cage 3, and then the C-shaped steel column 2 is stably connected with the reinforcement cage 3, and meanwhile, the C-shaped steel column 2 is stably connected with the reinforcement cage 3 through the positioning screw.

[0039] Therefore, the C-shaped steel column 2 is movably arranged in the reinforcement cage 3, so as to adjust that the axis of the C-shaped steel column 2 coincides with the axis of the reinforcement cage 3 and improve the perpendicularity of the C-shaped steel column 2, so as to avoid that the C-shaped steel column 2 is deformed due to eccentric bending moment and further improve the compression bearing capacity of the C-shaped steel column 2, that is, improve the overall bearing capacity of the cast-in-place pile 1, and meanwhile, the C-shaped steel column 2 avoids deviating from the pre-installed position, so as to facilitate that the upper part of the C-shaped steel column 2 is connected with the load-bearing beam or the stringer; in addition, the C-shaped steel column 2 is stably connected with the reinforcement cage 3 through the positioning screw, so as to enhance the shear capacity of the connecting joint between the C-shaped steel column 2 and the concrete, so as to avoid that the C-shaped steel column 2 is deformed under pressure and falls off from the cast-in-place pile 1, and further improve the connecting stability between the C-shaped steel column 2 and the cast-in-place pile 1.

[0040] It should be noted that the first group of nuts 8 includes two nuts, both of which are sleeved on the corresponding positioning screw rods, and the nuts are respectively arranged on both sides of the slot 6 on the C-shaped steel column 2. Since the inner diameter of the slot 6 is large, a gasket is arranged on both sides of the slot 6 to facilitate the screwing of the two nuts on both sides of each slot 6.

[0041] In addition, the web plate 21 and the two slots 6 on the pair of flanges 22 are respectively arranged at both ends of the insertion section of the C-shaped steel column 2. Specifically, since the bottom end of the C-shaped steel column 2 is easy to deviate when inserted into the reinforcement cage 3, and the top end of the C-shaped steel column 2 is easy to fall off from the reinforcement cage 3, the top end and the bottom end of the insertion section of the C-shaped steel column 2 are both provided with the first positioning screw rod 4 and the second positioning screw rod 5, and both are welded with the reinforcement cage 3, to further improve the connection stability of the C-shaped steel column 2 and the cast-in-place pile 1.

[0042] The above-mentioned reinforcement cage 3 includes a pair of longitudinal bars 31 and a spiral stirrup 32 arranged along the axial direction thereof, and the spiral stirrup 32 is connected between the pair of longitudinal bars 31. The two ends of the first positioning screw rod 4 and the second positioning screw rod 5 are both connected with the corresponding longitudinal bars 31, so that the C-shaped steel column 2 is fixedly connected with the reinforcement cage 3, for restraining the concrete, improving the compressive strength and tensile strength of the concrete, thereby enhancing the overall stability of the cast-in-place pile 1.

[0043] On the basis of the above-mentioned embodiment, a plurality of reinforcing screw rods 7 are arranged on the web plate 21 and the pair of flanges 22 between the two ends of the insertion section of the C-shaped steel column 2, each reinforcing screw rod 7 is arranged along the radial direction of the reinforcement cage 3, and the plurality of reinforcing screw rods 7 are distributed equidistantly along the axial direction of the C-shaped steel column 2.

[0044] Specifically, the plurality of reinforcing screw rods 7 are arranged on the web plate 21 and the pair of flanges 22 of the steel column insertion section along the axial direction of the C-shaped steel column 2, and each reinforcing screw rod 7 is located between the first positioning screw rod 4 and the second positioning screw rod 5, to enhance the shear capacity of the connection joint between the steel column insertion section and the concrete, thereby further improving the connection stability of the C-shaped steel column 2 and the cast-in-place pile 1. The plurality of reinforcing screw rods 7 are equidistantly arranged on the web plate 21 and the pair of flanges 22 of the steel column insertion section along the axial direction of the reinforcement cage 3, so that the C-shaped steel column 2 is uniformly stressed, and the load is effectively transmitted to the concrete layer through the C-shaped steel column 2.

[0045] Further, circular holes are equidistantly arranged on the web plate 21 and the pair of flanges 22 of the insertion section of the C-shaped steel column 2 along the axial direction thereof, one end of each reinforcing screw rod 7 is screwed on the C-shaped steel column 2 by the second group of nuts 9, and the other end is welded with the longitudinal bar 31, so that the C-shaped steel column 2 and the reinforcement cage 3 form an integrated structure, and the connection stability of the concrete and the C-shaped steel column 2 is further enhanced.

[0046] On the basis of the above-mentioned embodiment, the reinforcement cage 3 further comprises a transverse stirrup 33 connected between the top ends of the pair of longitudinal bars 31 along the radial direction of the reinforcement cage 3.

[0047] Specifically, the top end of the reinforcement cage 3 is located at the same horizontal plane as the top end of the insertion section of the C-shaped steel column 2. In order to prevent the C-shaped steel column 2 from falling off the top end of the cast-in-place pile 1, the transverse stirrup 33 is connected between the top ends of the pair of longitudinal bars 31 to enhance the structural stability of the top end of the reinforcement cage 3, thereby enhancing the shear resistance of the concrete structure at the top end of the steel column pile and preventing the C-shaped steel column 2 from falling off due to cracking at the top end of the steel column pile.

[0048] Optionally, the top end of the reinforcement cage 3 protrudes out of the pile hole 10, and the bottom end of the insertion section of the C-shaped steel column 2 protrudes out of the pile hole 10, so as to facilitate the installation of the positioning screw and the reinforcing screw 7.

[0049] In addition to the above-mentioned connecting structure of the C-shaped steel column and the cast-in-place pile, the present application further provides a construction method comprising the connecting structure applied to the C-shaped steel column and the cast-in-place pile, which specifically comprises the following steps:

[0050] Step S1, preparing a reinforcement cage and a C-shaped steel column;

[0051] Step S2, drilling a pile hole using a drilling machine, inserting the reinforcement cage into the pile hole, and making the reinforcement cage coaxial with the pile hole;

[0052] Step S3, inserting the lower part of the C-shaped steel column into the reinforcement cage, passing the first positioning screw through the insertion slot on the web plate and connecting the two ends of the first positioning screw with the reinforcement cage, passing the second positioning screw through the insertion slots on the pair of flanges respectively and connecting the two ends of the second positioning screw with the reinforcement cage, and achieving the initial verticality of the C-shaped steel column;

[0053] Step S4, moving the C-shaped steel column along the radial direction of the reinforcement cage until the C-shaped steel column is coaxial with the reinforcement cage, achieving the required verticality of the C-shaped steel column, and tightening the first set of nuts at the insertion slots to lock the C-shaped steel column;

[0054] Step S5, pouring concrete to the top end of the reinforcement cage, and forming a cast-in-place pile after the concrete solidifies.

[0055] Specifically, the steel reinforcement cage is inserted into the pile hole and arranged coaxially with the pile hole, the lower part of the C-shaped steel column is inserted into the steel reinforcement cage, the upper part of the C-shaped steel column protrudes from the steel reinforcement cage and is used for connecting the load-bearing beam or the string, only the lower part of the C-shaped steel column is the steel column insertion section, the web plate of the steel column insertion section and a pair of flanges are provided with insertion slots at the top end and the bottom end, the first positioning screw passes through the insertion slot on the web plate and is fixedly connected with the steel reinforcement cage at both ends, similarly, the second positioning screw passes through the insertion slots on the pair of flanges and is fixedly connected with the steel reinforcement cage at both ends, each positioning screw is arranged along the radial direction of the steel reinforcement cage, then the two ends of the steel column insertion section can move along the radial direction of the steel reinforcement cage on each positioning screw until the C-shaped steel column is coaxial with the steel reinforcement cage, and the first group of nuts are tightened at the insertion slots to fix the C-shaped steel column with each positioning screw, thereby the C-shaped steel column is stably connected with the steel reinforcement cage, finally, the concrete is poured to the top end of the steel reinforcement cage, and the concrete covers the steel reinforcement cage and the steel column insertion section to form the cast-in-place pile.

[0056] In summary, the C-shaped steel column 2 is arranged coaxially with the steel reinforcement cage 3, the compressive bearing capacity of the C-shaped steel column 2 is improved, thereby the bearing capacity of the whole cast-in-place pile 1 is improved, at the same time, the C-shaped steel column 2 is stably connected with the steel reinforcement cage 3 through the positioning bolt, the shear capacity of the connecting joint between the C-shaped steel column 2 and the concrete is enhanced, thereby the connecting stability of the C-shaped steel column 2 and the cast-in-place pile 1 is improved.

[0057] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0058] The C-shaped steel column and the cast-in-place pile connection structure and the construction method thereof provided by the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A connection structure between a C-shaped steel column and a cast-in-place pile, characterized in that, include: A reinforcing cage (3) is used to be installed in the pile hole (10); C-shaped steel column (2), the insertion section of the C-shaped steel column (2) is inserted into the reinforcing cage (3), the C-shaped steel column (2) includes a web (21) and a pair of flanges (22), and two slots (6) are provided on the web (21) and the pair of flanges (22) in sequence along the axial direction of the C-shaped steel column (2); a first positioning screw (4) and a second positioning screw (5), both of which are arranged radially along the reinforcing cage (3), the first positioning screw (4) passes through the slot (6) on the web (21) and its two ends are fixed to the reinforcing cage (3), the second positioning screw (5) passes through the slots (6) on the pair of flanges (22) in sequence and its two ends are fixed to the reinforcing cage (3), and the first positioning screw (4) and the second positioning screw (5) are both fitted with a first set of nuts (8) to fix the C-shaped steel column (2).

2. The connection structure between the C-shaped steel column and the cast-in-place pile according to claim 1, characterized in that, The two slots on the web (21) and the pair of flanges (22) are respectively located at both ends of the insertion section of the C-shaped steel column (2).

3. The connection structure between the C-shaped steel column and the cast-in-place pile according to claim 2, characterized in that, Several reinforcing screws (7) are provided on the web (21) and a pair of flanges (22) between the two ends of the insertion section of the C-shaped steel column (2). Each reinforcing screw (7) is arranged radially along the steel cage (3), and the several reinforcing screws (7) are distributed at equal intervals along the axial direction of the C-shaped steel column (2).

4. The connection structure between the C-shaped steel column and the cast-in-place pile according to claim 3, characterized in that, The two ends of the reinforcing screw (7) are fixed to the steel cage (3).

5. The connection structure between the C-shaped steel column and the cast-in-place pile according to any one of claims 1 to 4, characterized in that, The steel cage (3) includes a pair of longitudinal bars (31) and a spiral stirrup (32) arranged along its axial direction. The spiral stirrup (32) is connected between the pair of longitudinal bars (31). The two ends of the first positioning screw (4) and the second positioning screw (5) are connected to the corresponding longitudinal bars (31).

6. The connection structure between the C-shaped steel column and the cast-in-place pile according to claim 5, characterized in that, The steel cage (3) also includes transverse stirrups (33), which are radially connected between the tops of a pair of longitudinal bars (31) of the steel cage (3).

7. The connection structure between the C-shaped steel column and the cast-in-place pile according to any one of claims 1 to 4, characterized in that, The top of the steel cage (3) extends out of the pile hole (10), and the insertion section of the C-shaped steel column (2) is located outside the pile hole (10).

8. A construction method, characterized in that, The connection structure between the C-shaped steel column and the cast-in-place pile as described in any one of claims 1 to 7 includes: Prepare the reinforcing cage and the C-shaped steel column; The pile hole is formed by drilling with drilling machinery, and the reinforcing cage is inserted into the pile hole, with the reinforcing cage and the pile hole being coaxial. The insertion section of the C-shaped steel column is inserted into the reinforcing cage. The first positioning screw passes through the slot on the web and connects its two ends to the reinforcing cage. The second positioning screw passes through the slots on a pair of flanges in sequence and connects its two ends to the reinforcing cage. The C-shaped steel column achieves initial verticality. Move the C-shaped steel column and make it move radially along the reinforcing cage until the C-shaped steel column is coaxial with the reinforcing cage and the C-shaped steel column reaches the required verticality. Tighten the first set of nuts in each of the slots to lock the C-shaped steel column. Concrete is poured up to the top of the reinforcing cage, and after the concrete solidifies, a cast-in-place pile is formed.

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