Mechanical connection joint for prestressed concrete uplift pile

Abstract

The utility model relates to the related technical field of concrete uplift pile construction, in particular to a prestressed concrete uplift pile mechanical connector which comprises end plates, the bottom end face of an upper end plate is in contact fit with the top end face of a lower end plate, and a plurality of U-shaped uplift connecting holes are formed in the side walls of the end plates. A plurality of U-shaped anti-pulling connecting holes are formed in the two end plates, the U-shaped anti-pulling connecting holes in the two end plates are in one-to-one correspondence and are aligned, the mechanical connecting joints are matched with the U-shaped anti-pulling connecting holes correspondingly, each mechanical connecting joint comprises a square connecting plate, an anti-pulling connecting screw rod and a circular connecting plate, and the anti-pulling connecting screw rods are fixedly connected to the middle of the bottom end of the square connecting plate; the square connecting plate is in threaded connection with the uplift connecting screw rod, the circular connecting plate is in threaded connection with the uplift connecting screw rod, the square connecting plate is arranged at the edge of the bottom end of the upper uplift pile and cannot rotate, and the circular connecting plate is arranged at the edge of the top end of the lower uplift pile and can rotate.

Description

Technical Field

[0001] The utility model relates to the technical field related to the construction of concrete pull-out piles, in particular to a mechanical connection joint for prestressed concrete pull-out piles. Background Art

[0002] With the large-scale development of urban underground space, the foundation burial depth continues to increase, and the buoyancy of groundwater also increases, which can easily lead to the floating of foundation pits during construction or affect the normal use of underground structures. Anti-pull piles are widely used in anti-floating projects because of their advantages such as less disturbance to the rock and soil around the piles during construction, simple process, convenient construction, and good anti-floating effect. However, during the construction of anti-pull piles, the quality of pile welding is uneven, and even in actual projects, there are phenomena of cracking and pulling off of the pile welds, which seriously affects the tensile load resistance of the piles. There are many pull-out resistant mechanical joints at present, but they are all constrained by processing accuracy or construction efficiency. For example, spring-clip or screw-lock connection methods have high processing accuracy, but it is impossible to distinguish and confirm whether the connecting screw is stuck (locked) or whether a gap is left. In addition, it is impossible to visually observe, which poses a great risk. In addition, there are other mechanical connection methods that can be visually observed, but they will leave a large margin of error to compensate for the dimensional errors in the processing of mechanical connectors, the production and construction of prefabricated piles. After installation, the gaps are of different sizes. When the pull-out joint is subjected to a pulling force, the stress on the connector will also vary greatly. It may even happen that the pull-out joint has been destroyed while some connectors have not yet been subjected to stress. Utility Model Content

[0003] The utility model aims to provide a prestressed concrete pull-out pile mechanical connection joint to solve the technical problems existing in the above-mentioned background technology.

[0004] To achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A prestressed concrete pull-out pile mechanical connection joint comprises: an upper pull-out pile, a lower pull-out pile, an end plate and a mechanical connection joint, wherein the upper pull-out pile is located directly above the lower pull-out pile and is coaxially arranged, the bottom end surface of the upper pull-out pile and the top end surface of the lower pull-out pile are both fixedly connected with the end plate, the bottom end surface of the upper end plate is in contact with the top end surface of the lower end plate, a plurality of U-shaped pull-out connection holes are opened on the side wall of the end plate, and the plurality of U-shaped pull-out connection holes on the two end plates correspond to each other and are aligned, and the mechanical connection joint is arranged There are several mechanical connection joints which are respectively matched with several U-shaped anti-pull-out connection holes. The mechanical connection joints include: a square connection plate, an anti-pull-out connection screw and a circular connection plate. The anti-pull-out connection screw is fixedly connected to the middle part of the bottom end of the square connection plate, and the circular connection plate is threadedly connected to the anti-pull-out connection screw. The square connection plate is arranged at the bottom edge of the upper pile of the pull-out pile and cannot rotate. The anti-pull-out connection screw is movably inserted into the U-shaped anti-pull-out connection hole, and the circular connection plate is arranged at the top edge of the lower pile of the pull-out pile and can rotate.

[0006] Furthermore, the cross sections of the upper pile of the anti-pulling pile, the lower pile of the anti-pulling pile and the end plate are circular rings with the same size.

[0007] Furthermore, the plurality of U-shaped anti-pullout connection holes on the end plate are distributed in a circular array.

[0008] Furthermore, a plurality of square dark boxes are provided at the bottom edge of the upper pile of the pull-out pile and located directly above the plurality of U-shaped pull-out anti-connecting holes, and a plurality of U-shaped dark boxes are provided at the top edge of the lower pile of the pull-out pile and located directly below the plurality of U-shaped pull-out anti-connecting holes. The cross-sectional dimensions of the square dark boxes and the U-shaped dark boxes are both larger than the cross-sectional dimensions of the U-shaped pull-out anti-connecting holes, and the dimensions of the square connecting plate and the circular connecting plate are matched with the dimensions of the square dark boxes and the U-shaped dark boxes, respectively. The square connecting plate and the circular connecting plate are respectively embedded in the square dark boxes and the U-shaped dark boxes.

[0009] Furthermore, the four corners of the square connecting plate are rounded.

[0010] Furthermore, a screw hole is opened in the middle of the circular connecting plate, and the anti-pullout connecting screw is composed of an upper straight rod part and a lower screw rod part welded and fixed on the square connecting plate, and the lower screw rod part of the anti-pullout connecting screw is threadedly connected in the screw hole.

[0011] Furthermore, when the anti-pullout connecting screw is tightened with the circular connecting plate, the bottom end surface of the square connecting plate is pressed into contact with the top end surface of the upper end plate, and the top end surface of the circular connecting plate is pressed into contact with the bottom end surface of the lower end plate.

[0012] Furthermore, a plurality of concave holes are evenly formed on the side wall of the circular connecting plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] Compared with traditional mechanical joints, the mechanical connection joints in the utility model are convenient and simple to construct, and the installation quality is controllable; and the mechanical connection joints are adjustable, which makes up for the precision errors in the production and construction of pull-out piles, and has a wider range of applications. After installation, each mechanical connection joint is tightly attached to the end plate. When the pull-out pile joint is subjected to a pulling force, the mechanical connection joints at the pull-out pile joint can be pulled at the same time, and the force is more uniform, which greatly improves the overall tensile performance of the pull-out pile joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a top view of the middle end plate of the utility model;

[0017] Figure 3 It is a partial cross-sectional view of the utility model when the mechanical connection joint is not installed;

[0018] Figure 4 It is a partial cross-sectional view of the utility model when the mechanical connection joint is installed;

[0019] Figure 5 It is a top view of the square connecting plate in the utility model;

[0020] Figure 6 This is a connection view of the square connection plate and the anti-pullout connection screw in the utility model;

[0021] Figure 7 It is a cross-sectional view of the circular connecting plate in the utility model;

[0022] Figure 8 It is a longitudinal sectional view of the circular connecting plate in the utility model.

[0023] The numbers in the accompanying drawings are: 1-upper pile of pull-out pile, 101-square dark box, 2-lower pile of pull-out pile, 201-U-shaped dark box, 3-end plate, 301-U-shaped pull-out connecting hole, 4-mechanical connecting joint, 401-square connecting plate, 402-pull-out connecting screw, 403-circular connecting plate, 4031-concave hole. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figures 1 to 8As shown, a mechanical connection joint of a prestressed concrete pull-out pile comprises: an upper pile 1 of the pull-out pile, a lower pile 2 of the pull-out pile, an end plate 3 and a mechanical connection joint 4, the upper pile 1 of the pull-out pile is located directly above the lower pile 2 of the pull-out pile and is arranged coaxially, the bottom end surface of the upper pile 1 of the pull-out pile and the top end surface of the lower pile 2 of the pull-out pile are fixedly connected with the end plate 3, the bottom end surface of the upper end plate 3 is in contact with the top end surface of the lower end plate 3, and the cross-sections of the upper pile 1 of the pull-out pile, the lower pile 2 of the pull-out pile and the end plate 3 are circular rings of the same size; a plurality of U-shaped pull-out connection holes 301 are opened on the side wall of the end plate 3, and the plurality of U-shaped pull-out connection holes 301 on the end plate 3 are distributed in a circular array; and the plurality of U-shaped pull-out connection holes 301 on the two end plates 3 correspond to each other one by one and Aligned setting, there are several mechanical connection joints 4, and the several mechanical connection joints 4 are respectively matched with several U-shaped pull-out connection holes 301. The mechanical connection joint 4 includes: a square connection plate 401, a pull-out connection screw 402 and a circular connection plate 403. The four corners of the square connection plate 401 are all rounded; the pull-out connection screw 402 is fixedly connected to the middle of the bottom end of the square connection plate 401, and the circular connection plate 403 is threadedly connected to the pull-out connection screw 402. The square connection plate 401 is arranged at the bottom edge of the upper pile 1 of the pull-out pile and cannot be rotated. The pull-out connection screw 402 is movably inserted into the U-shaped pull-out connection hole 301, and the circular connection plate 403 is arranged at the top edge of the lower pile 2 of the pull-out pile and can be rotated.

[0026] In the present embodiment, a plurality of square dark boxes 101 are provided at the bottom edge of the upper pile 1 of the pull-out pile and located directly above the plurality of U-shaped pull-out connecting holes 301, and a plurality of U-shaped dark boxes 201 are provided at the top edge of the lower pile 2 of the pull-out pile and located directly below the plurality of U-shaped pull-out connecting holes 301. The cross-sectional dimensions of the square dark boxes 101 and the U-shaped dark boxes 201 are both larger than the cross-sectional dimensions of the U-shaped pull-out connecting holes 301. The dimensions of the square connecting plate 401 and the circular connecting plate 403 are respectively matched with the dimensions of the square dark boxes 101 and the U-shaped dark boxes 201. The square connecting plate 401 and the circular connecting plate 403 are respectively embedded in the square dark boxes 101 and the U-shaped dark boxes 201. The square dark boxes 101 and the U-shaped dark boxes 201 are equivalent to providing square grooves and U-shaped grooves at the edges of the upper pile 1 of the pull-out pile and the lower pile 2 of the pull-out pile.

[0027] A screw hole is opened in the middle of the circular connecting plate 403, and the anti-pull-out connecting screw 402 is composed of an upper straight rod part and a lower screw part which are welded and fixed on the square connecting plate 401, and the lower screw part of the anti-pull-out connecting screw 402 is threadedly connected in the screw hole; when the anti-pull-out connecting screw 402 and the circular connecting plate 403 are tightened, the bottom end surface of the square connecting plate 401 is pressed and contacted with the top end surface of the upper end plate 3, and the top end surface of the circular connecting plate 403 is pressed and contacted with the bottom end surface of the lower end plate 3.

[0028] In this embodiment, a plurality of recessed holes 4031 are evenly formed on the side wall of the circular connecting plate 403. The mechanical connecting joint 4 can be tightened by inserting a pry bar from the U-shaped dark box 201 into one of the recessed holes 4031 and rotating the circular connecting plate 403. During the tightening process, since the square connecting plate 401 and the square dark box 101 are both square and cooperate with each other, the anti-pull-out connecting screw 402 will not rotate, thereby facilitating the tightening of the mechanical connecting joint 4.

[0029] During the construction of prestressed concrete pull-out piles, the pull-out pile upper pile 1 and the pull-out pile lower pile 2 produced according to the requirements are aligned, and then the several U-shaped pull-out connection holes 301 on the side walls of the two are aligned one by one. Then, the mechanical connection joint 4 is connected and the distance between the square connection plate 401 and the circular connection plate 403 is adjusted so that they can be placed in the matching U-shaped pull-out connection hole 301 and the square dark box 101 and the U-shaped dark box 201. Then, the mechanical connection joint 4 can be tightened by inserting the pry bar from the U-shaped dark box 201 into one of the concave holes 4031 and rotating the circular connection plate 403. During the tightening process, Since the square connecting plate 401 and the square cassette 101 are both square and cooperate with each other, the pull-out connection screw 402 will not rotate, which facilitates the tightening of the mechanical connection joint 4. Through the setting of the prestressed concrete pull-out pile mechanical connection joint, construction is convenient, and the installation quality is controllable. Its adjustability makes up for the precision error in the production and construction of the pull-out piles, and the scope of application is wider. After installation, each mechanical connection joint 4 is tightly attached to the end plate 3. When the pull-out pile joint is subjected to a pulling force, several mechanical connection joints 4 at the pull-out pile joint can be pulled at the same time, and the force is more uniform, which greatly improves the overall tensile performance of the pull-out pile joint.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] The above description is only a preferred embodiment of the utility model and does not constitute any form of limitation to the utility model. Any technician familiar with the profession, without departing from the scope of the technical solution of the utility model and based on the technical essence of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment shall still fall within the scope of protection of the technical solution of the utility model.

Claims

1. A mechanical connection joint of a prestressed concrete pull-out pile, characterized in that: include: An upper pull-out pile (1), a lower pull-out pile (2), an end plate (3) and a mechanical connection joint (4), wherein the upper pull-out pile (1) is located directly above the lower pull-out pile (2) and is coaxially arranged, the bottom end surface of the upper pull-out pile (1) and the top end surface of the lower pull-out pile (2) are both fixedly connected with the end plate (3), the bottom end surface of the upper end plate (3) is in contact with the top end surface of the lower end plate (3), a plurality of U-shaped pull-out connection holes (301) are opened on the side wall of the end plate (3), and the plurality of U-shaped pull-out connection holes (301) on the two end plates (3) correspond to each other and are aligned, and a plurality of mechanical connection joints (4) are arranged, and the plurality of mechanical connection joints (4) are respectively connected to the plurality of mechanical connection joints (4). The mechanical connection joint (4) is matched with a plurality of U-shaped anti-pull-out connection holes (301), and comprises: a square connection plate (401), an anti-pull-out connection screw (402) and a circular connection plate (403). The anti-pull-out connection screw (402) is fixedly connected to the middle part of the bottom end of the square connection plate (401), and the circular connection plate (403) is threadedly connected to the anti-pull-out connection screw (402). The square connection plate (401) is arranged at the bottom edge of the upper pile (1) of the anti-pull-out pile and cannot rotate. The anti-pull-out connection screw (402) is movably inserted into the U-shaped anti-pull-out connection hole (301), and the circular connection plate (403) is arranged at the top edge of the lower pile (2) of the anti-pull-out pile and can rotate.

2. A prestressed concrete pull-out pile mechanical connection joint according to claim 1, characterized in that: The cross sections of the upper anti-pulling pile (1), the lower anti-pulling pile (2) and the end plate (3) are circular rings with the same size.

3. The prestressed concrete pull-out pile mechanical connection joint according to claim 1, characterized in that: The plurality of U-shaped anti-pullout connection holes (301) on the end plate (3) are distributed in a circumferential array.

4. The prestressed concrete pull-out pile mechanical connection joint according to claim 1, characterized in that: A plurality of square dark boxes (101) are provided at the bottom edge of the upper anti-pullout pile (1) and located directly above the plurality of U-shaped anti-pullout connection holes (301); a plurality of U-shaped dark boxes (201) are provided at the top edge of the lower anti-pullout pile (2) and located directly below the plurality of U-shaped anti-pullout connection holes (301); the cross-sectional dimensions of the square dark boxes (101) and the U-shaped dark boxes (201) are both larger than the cross-sectional dimensions of the U-shaped anti-pullout connection holes (301); the dimensions of the square connecting plate (401) and the circular connecting plate (403) are respectively matched with the dimensions of the square dark boxes (101) and the U-shaped dark boxes (201); the square connecting plate (401) and the circular connecting plate (403) are respectively embedded in the square dark boxes (101) and the U-shaped dark boxes (201).

5. A prestressed concrete pull-out pile mechanical connection joint according to claim 1 or 4, characterized in that: The four corners of the square connecting plate (401) are all rounded.

6. The prestressed concrete pull-out pile mechanical connection joint according to claim 4, characterized in that: A screw hole is provided in the middle of the circular connecting plate (403), and the anti-pullout connecting screw rod (402) is composed of an upper straight rod portion and a lower screw rod portion which are welded and fixed on the square connecting plate (401), and the lower screw rod portion of the anti-pullout connecting screw rod (402) is threadedly connected in the screw hole.

7. A prestressed concrete pull-out pile mechanical connection joint according to claim 6, characterized in that: When the anti-pullout connecting screw (402) and the circular connecting plate (403) are tightened, the bottom end surface of the square connecting plate (401) is pressed into contact with the top end surface of the upper end plate (3), and the top end surface of the circular connecting plate (403) is pressed into contact with the bottom end surface of the lower end plate (3).

8. The prestressed concrete pull-out pile mechanical connection joint according to claim 1, characterized in that: A plurality of concave holes (4031) are evenly arranged on the side wall of the circular connecting plate (403).

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