Mixed reinforced concrete pile

Abstract

The utility model discloses a mixed reinforced concrete pile, which comprises a pile body, prestressed reinforcements and non-prestressed reinforcements, the prestressed reinforcements and the non-prestressed reinforcements are embedded in the pile body, an end plate is arranged at the end part of the pile body, the prestressed reinforcements are connected with the end plate, a connecting convex block is arranged on the inner side surface of the end plate, which is in contact with the pile body, and a sliding hole is formed in the connecting convex block. A sliding hole is formed in the end plate and extends into the end plate, a sliding sleeve is slidably connected into the sliding hole, the non-prestressed steel bar is connected with the sliding sleeve, a threaded hole corresponding to the sliding hole is formed in the outer side face of the end plate, the threaded hole and the sliding hole are coaxial, and a compression bolt is connected into the threaded hole in a threaded mode. And meanwhile, the length of the non-prestressed steel bar exceeds that of the pile body, so that the ductility of the pile body is not influenced.

Description

Technical Field

[0001] The utility model belongs to the field of concrete piles, and more specifically relates to a mixed reinforced concrete pile. Background Art

[0002] Hybrid reinforced concrete piles refer to prestressed concrete piles in which non-prestressed steel bars are embedded before concrete pouring, without tensioning the non-prestressed steel bars so that they do not provide prestress, which can improve the overall ductility of the prestressed piles.

[0003] The steel cage with mixed reinforcement generally has prestressed steel bars and non-prestressed steel bars arranged at intervals or in an alternating manner and connected by stirrups, and end plates are arranged at both ends of the steel cage. For example, the patent with publication number CN219315704U discloses a precast concrete pile with mixed reinforcement, which connects prestressed steel bars and non-prestressed steel bars through an end plate. The stability of the connection is improved by the rigid connection between the non-prestressed steel bars and the end plate, and the cementitious material is used to make the non-prestressed steel bars move axially when the cementitious material is not fully solidified, so as to prevent the non-prestressed steel bars from being subjected to tension.

[0004] However, the above method completely buries the non-prestressed steel bars in the pile body, so that the actual length of the non-prestressed steel bars is shorter than the length of the pile body, and the actual length is smaller than the length of the pile body, thus affecting the overall ductility of the pile body. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a mixed reinforced concrete pile with good pile integrity and good pile quality.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a mixed reinforced concrete pile, comprising a pile body and prestressed steel bars and non-prestressed steel bars buried in the pile body, an end plate is provided at the end of the pile body, the prestressed steel bars are connected to the end plate, a connecting protrusion is provided on the inner side surface of the end plate in contact with the pile body, a sliding hole is provided on the connecting protrusion, the sliding hole extends into the end plate, a sliding sleeve is slidably connected in the sliding hole, the non-prestressed steel bars are connected to the sliding sleeve, a threaded hole corresponding to the sliding hole is provided on the outer side surface of the end plate, and the threaded hole is coaxial with the sliding hole, and a clamping bolt is threadedly connected in the threaded hole.

[0007] Furthermore, the sliding sleeve and the sliding hole are connected via a spline.

[0008] Furthermore, the diameter of the threaded hole is larger than the diameter of the sliding hole.

[0009] Furthermore, the non-prestressed steel bar is threadedly connected to the sliding sleeve.

[0010] Furthermore, a concrete release agent is coated on the side of the sliding sleeve away from the clamping bolt.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: when the prestressed steel bars are tensioned, a gap is generated between the non-prestressed steel bars and the clamping bolts through the relative sliding between the sliding sleeve and the end plate; when the prestressed steel bars release stress, the two end plates shrink, and the sliding sleeve and the end plates slide relatively again, and then are clamped on both ends of the non-prestressed steel bars by the clamping bolts; this structure will not directly squeeze the non-prestressed steel bars and affect the integrity of the pile body; at the same time, the length of the non-prestressed steel bars exceeds the length of the pile body, and therefore will not affect the ductility of the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the mixed reinforced concrete pile of the utility model;

[0013] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0014] Figure 3 It is a structural schematic diagram of the prestressed steel bar in the untensioned state;

[0015] Figure 4 It is a schematic diagram of the structure under the tension state of prestressed steel bars.

[0016] Figure numerals: pile body 1; prestressed steel bar 2; non-prestressed steel bar 3; end plate 4; connecting protrusion 5; sliding hole 6; sliding sleeve 7; threaded hole 8; clamping bolt 9. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0019] Reference Figures 1 to 4 The utility model is further described.

[0020] A mixed reinforced concrete pile comprises a pile body 1 and prestressed steel bars 2 and non-prestressed steel bars 3 buried in the pile body 1, an end plate 4 is provided at the end of the pile body 1, the prestressed steel bars 2 are connected to the end plate 4, a connecting protrusion 5 is provided on the inner side surface of the end plate 4 in contact with the pile body 1, a sliding hole 6 is provided on the connecting protrusion 5, the sliding hole 6 extends into the end plate 4, a sliding sleeve 7 is slidably connected in the sliding hole 6, the non-prestressed steel bars 3 are connected to the sliding sleeve 7, a threaded hole 8 corresponding to the sliding hole 6 is provided on the outer side surface of the end plate 4, and the threaded hole 8 is coaxial with the sliding hole 6, and a clamping bolt 9 is threadedly connected in the threaded hole 8.

[0021] like Figure 3 As shown, the prestressed steel bar 2 and the non-prestressed steel bar 3 are connected to the end plate 4 in sequence. At this time, the clamping bolt 9 is not completely connected to the threaded hole 8, and the end face of the sliding sleeve 7 is in contact with the clamping bolt 9, and there is a certain displacement distance between the other end face of the sliding sleeve 7 and the end face of the connecting protrusion 5;

[0022] like Figure 4 As shown, the prestressed steel bar 2 is tensioned by moving the end plate 4, and the sliding sleeve 7 is slid in the sliding hole 6, so that a gap is generated between the sliding sleeve 7 and the clamping bolt 9. After the tensioning is completed, the other end face of the sliding sleeve 7 is flush with the end face of the connecting protrusion 5, and then the clamping bolt 9 is completely screwed in, and at this time, there is still a small gap between the clamping bolt 9 and the sliding sleeve 7.

[0023] like Figure 2 As shown, concrete is poured into the tensioned steel cage, and when the concrete solidifies to 70%-80%, the tension of the end plate 4 is released, and the pile body 1 begins to generate internal stress through the viscosity between the prestressed steel bar 2 and the concrete. At the same time, since the concrete pile body 1 is not completely solidified at this time, the end plates 4 at both ends of the pile body 1 will have a certain movement in the same direction, thereby causing relative sliding between the end plate 4 and the sliding sleeve 7, until the end face of the sliding sleeve 7 contacts the clamping bolt 9 again, and a certain clamping force is generated between the clamping bolt 9.

[0024] When the prestressed steel bar 2 releases stress, there is a small gap between the clamping bolt 9 and the sliding sleeve 7, so the compression of the end plate 4 will not directly squeeze the non-prestressed steel bar 3 and affect the integrity of the pile body 1. At the same time, the non-prestressed steel bar 3 exceeds the length of the pile body 1, so it will not affect the ductility of the pile body 1.

[0025] In the preferred embodiment of the present invention, if the prestressed steel bar 2 is tensioned at one end, a structure such as a sleeve 7 is provided on the end plate 4 at the tensioning end, and the non-prestressed steel bar 3 is then threadedly connected to the sleeve 7 on the end plate 4; if the prestressed steel bar 2 is tensioned at both ends, a structure such as a sleeve 7 is provided on the end plates 4 at both ends, and the two ends of the non-prestressed steel bar 3 are respectively threadedly connected to the sleeves 7 on the two end plates 4, and the bolts on the two sleeves 7 are positive and negative threads, so as to facilitate the simultaneous connection of the two ends of the non-prestressed steel bar 3.

[0026] like Figure 2 As shown, in this embodiment, preferably, the end surface of the non-prestressed steel bar 3 is flush with the end surface of the sliding sleeve 7, so that when the sliding sleeve 7 contacts the clamping bolt 9, the non-prestressed steel bar 3 also contacts the clamping bolt 9.

[0027] Preferably in this embodiment, the sliding sleeve 7 and the sliding hole 6 are connected via a spline.

[0028] like Figure 2 As shown, in this embodiment, preferably, the diameter of the threaded hole 8 is larger than the diameter of the sliding hole 6, so that the sliding sleeve 7 can be easily inserted into the threaded hole 8 and the spline on the sliding sleeve 7 can be prevented from interfering with the thread in the threaded hole 8.

[0029] Preferably in this embodiment, the non-prestressed steel bar 3 is threadedly connected to the sliding sleeve 7 .

[0030] Preferably, in this embodiment, a concrete release agent is coated on the side of the sliding sleeve 7 away from the clamping bolt 9 to facilitate separation of the sliding sleeve 7 from the concrete when relative sliding occurs between the sliding sleeve 7 and the end plate 4 .

[0031] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A mixed reinforced concrete pile, comprising a pile body and prestressed steel bars and non-prestressed steel bars embedded in the pile body, wherein an end plate is provided at the end of the pile body, and the prestressed steel bars are connected to the end plate, characterized in that: A connecting protrusion is provided on the inner side surface where the end plate contacts the pile body, and a sliding hole is provided on the connecting protrusion. The sliding hole extends into the end plate, and a sliding sleeve is slidably connected in the sliding hole. The non-prestressed steel bar is connected to the sliding sleeve. A threaded hole corresponding to the sliding hole is provided on the outer side surface of the end plate, and the threaded hole is coaxial with the sliding hole, and a clamping bolt is threadedly connected in the threaded hole.

2. The hybrid reinforced concrete pile according to claim 1, characterized in that: The sliding sleeve and the sliding hole are connected via a spline.

3. The hybrid reinforced concrete pile according to claim 1, characterized in that: The diameter of the threaded hole is larger than the diameter of the sliding hole.

4. The hybrid reinforced concrete pile according to claim 1, characterized in that: The non-prestressed steel bar is threadedly connected to the sliding sleeve.

5. The hybrid reinforced concrete pile according to claim 1, characterized in that: The side of the sliding sleeve away from the clamping bolt is coated with a concrete release agent.

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