A precast concrete connector and a precast concrete pile

Abstract

The application discloses a precast concrete connecting piece and a precast concrete pile, wherein the connecting piece comprises a plug rod, a ribbed cylinder, a first fixing sleeve and a second fixing sleeve; the plug rod comprises a base and a plug arranged on the base; the ribbed cylinder comprises a sleeve-shaped ribbed cylinder body and a plurality of elastic rib teeth uniformly arranged at one end of the ribbed cylinder body, the elastic rib teeth are opened outward along the radial direction of the ribbed cylinder body from one end to the free end of the ribbed cylinder body, and the end face of the free end of the elastic rib tooth is an abutting face; the ribbed cylinder is sleeved on the plug and fixedly connected with the plug through the ribbed cylinder body; an annular clamping groove is arranged on the inner side wall of the second fixing sleeve, a clamping face is arranged in the annular clamping groove, and the abutting face of the elastic rib tooth is abutted with the clamping face when the plug rod is inserted into the second fixing sleeve. The precast concrete connecting piece has the advantages of simple structure, high connecting strength and tensile bearing capacity, and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated concrete connection, in particular to a prefabricated concrete connecting piece and a prefabricated concrete pile. BACKGROUND

[0002] In the process of building construction, the connection between the main reinforcement of prefabricated concrete components is indispensable. The traditional butt joint of prefabricated concrete pipe piles is achieved by welding between the end plates. However, due to the limitation of the welding process, only the outer periphery of the end plate is welded, and the other 95% of the area of the end plate is not treated. The uneven and insufficient connection of the pile body will result in low pullout and bending resistance of the pile body. In addition, the traditional welding process exposes the end plate, which causes poor corrosion resistance and the problem that the components cannot be tightly connected. SUMMARY

[0003] The present application proposes a prefabricated concrete connecting piece to solve the above problems.

[0004] The technical means adopted by the present application are as follows:

[0005] A prefabricated concrete connecting piece, comprising a plug rod, an umbrella rib barrel, a first fixing sleeve and a second fixing sleeve.

[0006] The plug rod comprises a base and a plug head arranged on the base.

[0007] The umbrella rib barrel comprises a sleeve-shaped umbrella rib barrel body and a plurality of elastic umbrella rib teeth uniformly arranged at one end of the umbrella rib barrel body. The other end of the elastic umbrella rib teeth is a free end. The elastic umbrella rib teeth open outward along the radial direction of the umbrella rib barrel body from one end of the umbrella rib barrel body to the free end. The end face of the free end of the elastic umbrella rib teeth is an abutting face. The umbrella rib barrel is sleeved on the plug head and fixedly connected with the plug head through the umbrella rib barrel body. The free end of the elastic umbrella rib teeth faces one end of the base.

[0008] One end of the first fixing sleeve is a first main reinforcement fixing part, and the other end is a plug rod fixing part. The base is fixedly connected with the plug rod fixing part.

[0009] One end of the second fixing sleeve is a second main reinforcement fixing part, and the other end is a plug rod insertion part. An annular clamping groove is arranged on the inner side wall of the plug rod insertion part. A clamping face is arranged in the annular clamping groove. When the plug rod is inserted into the second fixing sleeve through the plug rod insertion part, the free end of the elastic umbrella rib teeth is inserted into the annular clamping groove, so that the abutting face abuts against the clamping face.

[0010] Further, when the elastic umbrella rib teeth are in the open state, the included angle between the abutting face and the axis of the umbrella rib barrel body is 30° to 80°.

[0011] Further, the included angle between the abutting surface and the axis of the umbrella rib barrel body is consistent with the included angle between the clamping surface and the axis of the second fixing sleeve.

[0012] Further, the included angle between the abutting surface and the axis of the umbrella rib barrel body is consistent with the included angle between the clamping surface and the axis of the second fixing sleeve.

[0013] Further, the outer wall surface of the elastic umbrella rib tooth is arc-shaped from one end of the umbrella rib barrel body to the free end.

[0014] Further, the inner side wall of the insertion rod insertion part is provided with a tensioning internal thread.

[0015] Further, the inner side wall of the second fixing sleeve close to the second main rib fixing part is provided with a tensioning internal thread.

[0016] Further, the insertion rod and the umbrella rib barrel are integrated.

[0017] Further, the plug is provided with a first external thread, the umbrella rib barrel body is provided with a first internal thread, and the umbrella rib barrel body and the plug are fixedly connected through the first external thread and the first internal thread.

[0018] A prefabricated concrete pile comprises a prefabricated concrete pile body, and the two ends of the prefabricated concrete pile body are provided with the prefabricated concrete connector disclosed in the application.

[0019] Compared with the prior art, the prefabricated concrete connector disclosed in the application has the following beneficial effects: the prefabricated concrete connector disclosed in the application is provided with an insertion rod, an umbrella rib barrel, a first fixing sleeve and a second fixing sleeve, the umbrella rib barrel is fixed on the insertion rod, the umbrella rib barrel is provided with elastic umbrella rib teeth, the second fixing sleeve is provided with a clamping surface, when the insertion rod is inserted into the second fixing sleeve, the umbrella rib barrel can be quickly and firmly clamped with the second fixing sleeve, thereby improving the tensile and pulling resistance of the concrete connector, ensuring the connection strength between the concrete piles, and being good in integrity and stability and high in tensile bearing capacity. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural view of the first embodiment of the prefabricated concrete connector disclosed in the application.

[0021] Figure 2a It is a front view of the umbrella rib barrel.

[0022] Figure 2b It is a right view of Figure 2a .

[0023] Figure 2c It is a left view of Figure 2a .

[0024] Figure 2d It is a left view ofFigure 2c A-A sectional view of the present application;

[0025] Figure 3 Structure diagram of the insertion rod;

[0026] Figure 4 Structure diagram of the first fixed sleeve;

[0027] Figure 5 Structure diagram of the second fixed sleeve;

[0028] Figure 6a Schematic diagram of the insertion process when the abutting surface is perpendicular to the axis of the umbrella rib barrel body;

[0029] Figure 6b Schematic diagram of the insertion process when the abutting surface is inclined to the axis of the umbrella rib barrel body;

[0030] Figure 7a Second structure of the second fixed sleeve in Example 1;

[0031] Figure 7b Structure diagram of the connection between the second fixed sleeve with the second structure in Example 1 and the insertion rod;

[0032] Figure 8 Structure diagram of the second embodiment of the prefabricated concrete connecting piece disclosed by the present application;

[0033] Figure 9 Structure diagram of the second fixed sleeve in the second embodiment;

[0034] Figure 10 Prefabricated concrete pile disclosed by the present application.

[0035] In the figure: 1, insertion rod, 10, base, 11, plug, 12, first external thread, 2, umbrella rib barrel, 20, umbrella rib barrel body, 21, elastic umbrella rib tooth, 22, abutting surface, 23, first internal thread, 24, cutting groove, 3, first fixed sleeve, 30, first main reinforcement fixing part, 31, insertion rod fixing part, 32, first main reinforcement fixing hole, 4, second fixed sleeve, 40, second main reinforcement fixing part, 41, insertion rod insertion part, 42, annular clamping groove, 43, clamping surface, 44, tensioning internal thread, 45, second main reinforcement fixing hole, 46, insertion rod wrapping part, 7, main reinforcement, 70, prefabricated concrete pile body. DETAILED DESCRIPTION

[0036] Example 1

[0037] As Figure 1 shown is the first embodiment of the prefabricated concrete connecting piece disclosed by the present application, which comprises an insertion rod 1, an umbrella rib barrel 2, a first fixed sleeve 3, and a second fixed sleeve 4.

[0038] AsFigure 3 As shown, the insertion rod 1 comprises a base 10 and a plug 11 arranged on the base 10;

[0039] As shown in Figure 2a , Figure 2b , Figure 2c and Figure 2d , the umbrella rib barrel 2 comprises a sleeve-shaped umbrella rib barrel body 20 and a plurality of elastic umbrella rib teeth 21 arranged on one end of the umbrella rib barrel body 20, the other end of the elastic umbrella rib tooth 21 is a free end, a cutting groove 24 is arranged between two adjacent elastic umbrella rib teeth to realize the elastic umbrella rib tooth 21 from one end of the umbrella rib barrel body 20 to the free end outwardly opening along the radial direction of the umbrella rib barrel body 20, the end face of the free end of the elastic umbrella rib tooth 21 is an abutting face 22; the umbrella rib barrel 2 is sleeved on the plug 11 and fixedly connected with the plug 11 through the umbrella rib barrel body 20, the free end of the elastic umbrella rib tooth 21 is directed to one end of the base 10;

[0040] As shown in Figure 4 , one end of the first fixing sleeve 3 is a first main rib fixing part 30, the other end is an insertion rod fixing part 31, the base 10 is fixedly connected with the insertion rod fixing part 31, specifically, the first main rib fixing part 30 is provided with a first main rib fixing hole 32, the end part of the main rib in the precast concrete pile is fixed in the first main rib fixing part through the first main rib fixing hole 32, the main rib can be PC steel bar, steel strand or threaded steel, and the corresponding first main rib fixing part can be pier head clamping table, conical hole or threaded hole structure, the specific structure can be selected according to the need, in this embodiment, the base 10 is provided with external threads, the insertion rod fixing part 31 is provided with internal threads, and the base of the insertion rod is fixedly connected with the insertion rod fixing part through threads;

[0041] As shown in Figure 5As shown, the second fixed sleeve 4 is provided with a second main reinforcement fixed part 40 at one end and a plug rod insertion part 41 at the other end, an annular clamping groove 42 is arranged on the inner side wall of the plug rod insertion part 40, and a clamping surface 43 is arranged in the annular clamping groove 42. When the plug rod 1 is inserted into the second fixed sleeve 4 through the plug rod insertion part 41, the free end of the elastic umbrella tooth 21 is inserted into the annular clamping groove 42 so that the abutting surface 22 abuts against the clamping surface 43. Specifically, the second main reinforcement fixed part 40 is provided with a second main reinforcement fixed hole 45, and the end part of the main reinforcement in the prefabricated concrete pile is fixed in the second main reinforcement fixed part through the second main reinforcement fixed hole 45. The main reinforcement can be a PC steel bar, a steel strand or a threaded steel bar, and the corresponding first main reinforcement fixed part can be a pier head clamping table, a conical hole or a threaded hole, and the specific structure can be selected as needed. An annular clamping groove 42 is arranged on the inner side wall of the plug rod insertion part 40, and a clamping surface is arranged on the surface of the annular clamping groove 42 close to the plug rod insertion end. When the plug rod with the umbrella barrel is inserted into the second fixed sleeve, the umbrella barrel enters the annular clamping groove, and the elastic umbrella tooth is opened outward to realize the abutment of the end surface (abutting surface) of the elastic umbrella tooth and the end surface (clamping surface) of the annular clamping groove, thereby realizing the clamping of the plug rod and the second fixed sleeve. The prefabricated concrete connecting piece disclosed by the application has the advantages of simple structure, high tensile and anti-pulling performance, thereby ensuring the connection strength between the concrete piles.

[0042] As Figure 6a As shown in one embodiment of the prefabricated concrete connecting piece disclosed by the application, the angle between the abutting surface and the axis of the umbrella barrel body is 90° when the elastic umbrella tooth is opened, that is, the abutting surface is perpendicular to the axis of the umbrella barrel body. Correspondingly, the angle between the clamping surface and the axis of the second fixed sleeve is 90°, and the clamping surface is perpendicular to the axis of the second fixed sleeve. When the plug rod is inserted into the second fixed sleeve, the abutting surface and the clamping surface abut against each other to realize the mechanical connection of the plug rod and the second fixed sleeve. However, as shown in the figure, when the plug rod is inserted into the second fixed sleeve, in order to realize the mutual abutment between the abutting surface and the clamping surface, the umbrella barrel needs to be inserted into the annular clamping groove, that is, the free end of the elastic umbrella tooth needs to pass over the end surface (clamping surface) of the annular clamping groove, and the elastic umbrella tooth can be opened, Figure 6aThe middle dotted line represents the state of the elastic umbrella tooth when being squeezed during the plugging process. It can be seen from the figure that the elastic umbrella tooth is squeezed, so only the outermost edge of the elastic umbrella tooth is in contact with the insertion part of the insertion rod until the outermost edge of the elastic umbrella tooth reaches the clamping surface, and the elastic umbrella tooth can be opened. h in the figure represents the distance of the elastic umbrella tooth during transition insertion (or the distance generated after the elastic umbrella tooth is opened relative to when it is not opened). Due to the existence of the gap h, after the connection of the concrete members (concrete piles) is completed, a gap will inevitably be generated between the two concrete pile end surfaces due to the existence of the gap h, which may cause loosening between the concrete piles and cannot achieve tight connection. Further, as shown in the figure, when the prefabricated concrete pile is subjected to pulling action, i.e. pulling action force is generated between the insertion rod and the second fixed sleeve, at this time, the action force F1 is generated between the clamping surface and the abutting surface. Since the abutting surface is perpendicular to the axis of the umbrella barrel body, the force F1 is along the axis direction of the umbrella barrel body, which causes the elastic umbrella tooth to be eccentrically stressed and easily bent and broken.

[0043] Further, as shown in Figure 2d Another embodiment of the prefabricated concrete connecting piece disclosed by the application is shown. In this embodiment, the angle a between the abutting surface 22 and the axis B-B of the umbrella barrel body 20 is 30° to 80° when the elastic umbrella tooth 21 is opened, i.e. the abutting surface is inclined relative to the axis of the umbrella barrel body.

[0044] Further, as shown in Figure 5 and Figure 6b The angle b between the clamping surface 43 and the axis C-C of the second fixed sleeve is 30° to 80°, i.e. the clamping surface is inclined relative to the axis of the second fixed sleeve.

[0045] As shown in Figure 6b When the abutting surface and the clamping surface are inclined, the elastic umbrella tooth is more easily opened during the insertion of the insertion rod into the second fixed sleeve, i.e. the abutting surface can gradually open along the clamping surface (the dotted line in the figure represents the position when the elastic umbrella tooth just contacts the clamping surface), which ensures that the elastic umbrella tooth is in close contact with the second fixed sleeve at all times, achieving seamless connection of the insertion rod and the second fixed sleeve, and further achieving seamless connection between the prefabricated concrete piles. Further, as shown in the figure, when the prefabricated concrete pile is subjected to pulling action, i.e. pulling action force is generated between the insertion rod and the second fixed sleeve, at this time, the action force F2 is generated between the clamping surface and the abutting surface. Since the abutting surface is inclined relative to the axis of the umbrella barrel body, the force F2 will be in the direction of the elastic umbrella tooth, and the elastic umbrella tooth will be subjected to non-eccentric force, so deformation will not occur, ensuring the strength of the umbrella barrel. Since the abutting surface and the clamping surface are both inclined, the contact area between the umbrella barrel and the second fixed sleeve is larger, which can avoid the occurrence of stress concentration problem, improve the connection strength, and ensure the service life of the connecting piece.

[0046] Further, the angle between the abutting surface and the axis of the umbrella rib barrel body is consistent with the angle between the clamping surface and the axis of the second fixing sleeve, which can further improve the connection tightness between the elastic umbrella rib tooth and the second fixing sleeve and improve the connection strength of the connecting piece.

[0047] Further, as shown in Figure 2a and Figure 2d the outer wall surface of the elastic umbrella rib tooth 21 is arc-shaped from one end of the umbrella rib barrel body 20 to the free end, that is, the elastic umbrella rib tooth is a smooth arc-shaped structure (D-D in the figure is the center line of the umbrella rib barrel cut open, which is approximately an arc), in the present application, the arc-shaped elastic umbrella rib tooth further avoids stress concentration, and further, the arc-shaped elastic umbrella rib tooth and the inclined abutting surface design make the reaction force direction of the clamping surface of the second fixing sleeve be transmitted along the arc-shaped elastic umbrella rib tooth when the joint is pulled out, which ingeniously converts the eccentric compression of the elastic umbrella rib tooth in the vertical direction into the axial compression along the arc-shaped direction of the elastic umbrella rib tooth and the normal direction of the abutting surface, avoids the occurrence of the eccentric force of the elastic umbrella rib tooth, and the structure is more reliable and the joint pulling-out performance is higher.

[0048] Further, since the elastic umbrella rib tooth is a smooth arc-shaped structure, the elastic umbrella rib tooth is set to protrude towards the center of the umbrella rib barrel, when the joint is subjected to tension, the elastic umbrella rib tooth is subjected to pressure F2, and the deformation of the umbrella rib barrel under the action of the pressure F2 must be bending towards the center of the umbrella rib barrel, and the umbrella rib barrel is a plug, the deformation of the elastic umbrella rib tooth is resisted by the plug to prevent further development of the deformation, which greatly improves the stability and ultimate tensile performance of the joint.

[0049] Further, as shown in Figure 5 the inner side wall of the plug insertion part 41 is provided with a tensioning internal thread 44, so that the main reinforcement connected with the fixing sleeve can be tensioned by tensioning screws during the production of the precast concrete pile, so that the product can have both tensioning and connecting functions, which can meet the tensioning process in the production stage and the connection of the component in the construction stage, so as to achieve the purpose of one thing serving multiple purposes, not only reducing the cumbersome process, but also reducing the cost, and the ultimate tensile strength of the connecting piece is greatly increased.

[0050] The plug rod 1 and the umbrella rib barrel 2 in the application can be welded into an integrated structure, or can be processed into an integrated structure by casting or other ways. Preferably, the plug rod and the umbrella rib barrel are in a split structure and then assembled into an integrated structure. In the embodiment, the plug 11 is provided with a first external thread 12, the umbrella rib barrel body 20 is provided with a first internal thread 23, and the umbrella rib barrel body 20 and the plug 11 are fixedly connected through the first external thread 12 and the first internal thread 23. The plug rod and the umbrella rib barrel are in a split structure, facilitating the processing of each component. Meanwhile, the umbrella rib barrel and the plug rod can be pre-installed at the factory, without occupying construction time, improving the efficiency of the construction stage and saving time cost.

[0051] Further, the connecting piece disclosed in the application, the plug rod can be completely inserted into the second fixing sleeve, so that the first fixing sleeve and the second fixing sleeve can be tightly fitted when the concrete pile is inserted, which not only ensures the accuracy of the insertion of the plug rod, but also forms a sealed space, so that the plug rod can be completely enclosed in the sealed space, and the air, water and surrounding complex environment are isolated, thereby achieving the effect of corrosion prevention of the joint.

[0052] Further, as shown in Figure 7a and Figure 7b , the second structure of the second fixing sleeve in Example 1 is different from the first structure of the second fixing sleeve in Example 1, as shown in Figure 6a and Figure 6b , the length of the annular clamping groove along the axis of the second fixing sleeve in the first structure of the second fixing sleeve in Example 1 is greater than or equal to the length of the umbrella rib barrel, so that the umbrella rib barrel is entirely placed in the annular clamping groove when the plug rod is inserted into the second fixing sleeve, and the second structure of the second fixing sleeve in Example 1 is shown in Figure 7a and Figure 7b , the length of the annular clamping groove along the axis of the second fixing sleeve is less than the length of the umbrella rib barrel, and preferably, the length of the annular clamping groove is adapted to the length of the elastic umbrella rib tooth, that is, the plug rod holding part 46 is formed in the inner cavity of the second fixing sleeve close to one end of the main rib fixing part, and the inner diameter size of the plug rod holding part 46 is adapted to the outer diameter size of the umbrella rib barrel body, so that, as shown in Figure 7b , when the plug rod is inserted into the second fixing sleeve, the plug rod and part of the umbrella rib barrel body are inserted into the inner cavity of the second fixing sleeve, the inner diameter size of the plug rod holding part 46 is adapted to the outer diameter size of the umbrella rib barrel body, and after the connecting piece of the application is connected, the insertion end (the connection end of the plug rod and the umbrella rib barrel) of the combined part of the umbrella rib barrel and the plug rod is wrapped by the plug rod holding part, so that even when the elastic umbrella rib tooth is subjected to an exceeding limit tensile force and the elastic umbrella rib barrel tends to expand outward, the deformation and fracture of the umbrella rib barrel body are avoided due to the wrapping of the plug rod holding part, which greatly improves the limit tensile property and safety factor of the joint.

[0053] Embodiment 2

[0054] As Figure 8 and Figure 9 The second embodiment of the prefabricated concrete connecting piece disclosed by the present application is shown, and the difference between this embodiment and embodiment 1 is that, in embodiment 1, the tensioning internal thread of the second fixing sleeve is arranged on the inner side wall of the plug rod insertion part 41, that is, the tensioning internal thread is arranged on the inner wall of the second fixing sleeve close to the one end of the plug rod insertion part, and in this embodiment, the tensioning internal thread 44 is arranged on the inner side wall of the second fixing sleeve close to the one end of the second main reinforcement fixing part.

[0055] The tensioning thread of the existing prefabricated concrete connecting piece is arranged on the one end of the plug rod insertion part (such as the structure in embodiment 1), and in the production process of the prefabricated concrete pile, the fixing sleeve is connected and fixed by the tensioning screw, and the main reinforcement is tensioned, and at the same time, after the concrete member is laid, concrete vibration compaction or centrifugal forming needs to be carried out. In this process, the concrete slurry enters the fixing sleeve through the gap between the main reinforcement and the main reinforcement fixing hole, and then the concrete slurry solidifies to form a cement block in the fixing sleeve, which causes the plug rod to be not firmly inserted into the fixing sleeve or even unable to be inserted due to the existence of the cement block, resulting in that the connecting piece loses the connecting effect, and further causing the connection of the entire concrete pile to fail. In this embodiment, as Figure 8 and Figure 9 Since the tensioning internal thread 44 is arranged on the inner side wall of the second fixing sleeve close to the one end of the second main reinforcement fixing part, in the process of tensioning the main reinforcement by the tensioning screw and carrying out concrete vibration compaction or centrifugal forming after the concrete member is laid, since the tensioning screw is connected to the inner side wall of the second fixing sleeve close to the one end of the main reinforcement fixing part, the tensioning screw blocks the one end of the main reinforcement fixing hole and the one end of the annular clamping groove, so that the concrete slurry entering the fixing sleeve from the gap between the main reinforcement and the main reinforcement fixing hole is blocked on the one side of the main reinforcement fixing part and cannot enter the other side of the annular clamping groove, which does not affect the subsequent plug rod and second fixing sleeve insertion process, ensures the insertion quality of the plug rod and the connecting sleeve, and further ensures the insertion quality and efficiency of the concrete pile.

[0056] Further, in the prestressed reinforcement tensioning process of the prefabricated concrete pile, the tensioning screw used is M27 in the industry standard, so the size of the existing joint connecting piece, especially the plug, is limited to the size range of M27, which easily causes problems such as insufficient connecting strength of the connecting piece, and in the present application, since the tensioning internal thread 44 is arranged on the inner side wall of the second fixing sleeve close to the one end of the second main reinforcement fixing part and the annular clamping groove is arranged close to the one end of the plug rod insertion part, the size of the fixing sleeve is not limited, so the plug rod of the present application can be thicker, the elastic umbrella tooth thickness can be larger, and further the joint tensile bearing capacity can be higher.

[0057] Further, when the insertion rod is inserted into the second fixing sleeve, the insertion rod and part of the umbrella rib barrel body are inserted into the inner cavity of the second fixing sleeve provided with a tension inner thread, the inner diameter size of the tension inner thread is adapted to the outer diameter size of the umbrella rib barrel body, after the connection of the connecting piece of the present application is completed, the insertion end (the connection end of the insertion rod and the umbrella rib barrel) of the combined piece of the umbrella rib barrel and the insertion rod is wrapped by the inner cavity wall of the second fixing sleeve provided with the tension inner thread, thus, even when the elastic umbrella rib teeth are subjected to an over-limit tensile force, the elastic umbrella rib barrel has a deformation trend of expanding outward, due to the wrapping and resistance of the surrounding tension screw hole, the deformation and fracture of the barrel wall of the umbrella rib barrel body are avoided, and the limit tensile performance and safety factor of the joint are greatly improved.

[0058] Embodiment 3

[0059] As Figure 10 The prefabricated concrete pile disclosed by the present application comprises a prefabricated concrete pile body 70, and the two ends of the prefabricated concrete pile body are provided with the prefabricated concrete connecting piece disclosed by the present application.

[0060] The concrete member production stage: the two ends of the prestressed steel bar of a single pile pass through the first fixing sleeve and the second fixing sleeve respectively, and then the head is upset in the upsetting workshop, and the steel bar head is clamped in the sleeve. The first fixing sleeve and the second fixing sleeve are threadedly connected through the tension thread and the tension screw of the first fixing sleeve and the second fixing sleeve, and then a prestress tension process is performed. After the tension is completed, the centrifugal, steam curing and steam pressure processes are performed to realize the forming of the member.

[0061] The concrete member construction stage: when the single-section pile is transported to the construction site, the pile end of the first fixing sleeve end faces downward, and the pile end of the second fixing sleeve end faces upward. When the previous section of pile is sunk into the soil layer to reach the specified pile connection height, the next section of pile is transported, the first fixing sleeve end faces downward, the insertion rod is connected with the umbrella rib barrel in advance, and then the other end of the combined piece is connected with the first fixing sleeve. The combined piece of the insertion rod and the umbrella rib barrel is aligned with the through hole of the second fixing sleeve of the previous section of pile, and the insertion rod is pressed into the second fixing sleeve by using the self-weight of the pile body. At this time, the fins of the umbrella rib barrel are squeezed, contracted and then expanded, and finally the bottom of the umbrella rib barrel is in close contact with the blocking groove of the second fixing sleeve, thereby realizing the force transmission between the upper and lower sections of the pile.

[0062] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A precast concrete connector, characterized in that: Includes: insert rod, umbrella rib tube, first fixing sleeve and second fixing sleeve; The plug includes a base and a plug disposed on the base; The umbrella rib tube includes a sleeve-shaped umbrella rib tube body and a plurality of elastic umbrella rib teeth evenly distributed at one end of the umbrella rib tube body. The other end of the elastic umbrella rib teeth is a free end. The elastic umbrella rib teeth open outward from one end of the umbrella rib tube body towards the free end along the radial direction of the umbrella rib tube body. The end face of the free end of the elastic umbrella rib teeth is an abutment surface. The umbrella rib tube is fitted onto the plug and is fixedly connected to the plug through the umbrella rib tube body. The free end of the elastic umbrella rib teeth faces the end of the base. One end of the first fixed sleeve is the first main rib fixing part, and the other end is the insertion rod fixing part. The base is fixedly connected to the insertion rod fixing part. The first main reinforcement fixing part is provided with a first main reinforcement fixing hole. The end of the main reinforcement in the precast concrete pile passes through the first main reinforcement fixing hole and is fixed in the first main reinforcement fixing part. The main reinforcement adopts PC steel bar, steel strand or threaded steel structure. The first main reinforcement fixing part adopts pier head clamp, conical hole or threaded hole structure. The base is provided with external thread, the insertion rod fixing part is provided with internal thread, and the base of the insertion rod is threadedly fixed to the insertion rod fixing part. One end of the second fixed sleeve is the second main rib fixing part, and the other end is the insertion part of the insert rod. The inner side wall of the insertion part of the insert rod is provided with an annular groove and a snap-fit ​​surface is provided in the annular groove. When the insert rod is inserted into the second fixed sleeve through the insertion part of the insert rod, the free end of the elastic umbrella bone tooth is inserted into the annular groove so that the abutting surface abuts against the snap-fit ​​surface. The second main reinforcement fixing part is provided with a second main reinforcement fixing hole. The end of the main reinforcement in the precast concrete pile passes through the second main reinforcement fixing hole and is fixed in the second main reinforcement fixing part. The main reinforcement adopts PC steel bar, steel strand or threaded steel structure. The second main reinforcement fixing part adopts pier head clamping platform, conical hole or threaded hole structure. When the insert rod with umbrella tube is inserted into the second fixing sleeve, the umbrella tube enters the annular groove, and the elastic umbrella teeth open outward to realize the abutting surface of the elastic umbrella teeth and the abutting surface of the annular groove, thereby realizing the clamping of the insert rod and the second fixing sleeve. The length of the annular groove along the axis of the second fixed sleeve is adapted to the length of the elastic umbrella rib tooth. An insert rod wrapping part is formed at one end of the inner cavity of the second fixed sleeve near the main rib fixing part. The inner diameter of the insert rod wrapping part is adapted to the outer diameter of the umbrella rib tube body, and the inner diameter of the insert rod insertion part is larger than the inner diameter of the insert rod wrapping part. When the insert rod is inserted into the second fixed sleeve, the umbrella rib tube body is inserted into the insert rod wrapping part and is wrapped by the insert rod wrapping part. The inner wall of the insert rod wrapping part is provided with a tensioning internal thread. The tensioning internal thread is used to connect the tensioning screw with the tensioning internal thread during the process of concrete vibration compaction or centrifugal molding, and to block one end of the second main reinforcement fixing hole and one end of the annular groove, so that the concrete slurry entering the second fixing sleeve through the gap between the main reinforcement and the second main reinforcement fixing hole is blocked on one side of the second main reinforcement fixing part. When the elastic umbrella rib teeth are in the open state, the angle between the contact surface and the axis of the umbrella rib tube body is 30° to 80°. The angle between the snap-fit ​​surface and the axis of the second fixing sleeve is 30° to 80°; The outer wall surface of the elastic umbrella rib teeth has an arc structure from one end of the umbrella rib tube body to the free end; When the contact surface and the locking surface are inclined, during the process of inserting the rod into the second fixed sleeve, the contact surface can gradually spring open along the locking surface. When the precast concrete pile is subjected to a pull-out action, a pull-out force is generated between the rod and the second fixed sleeve, and a force is generated between the locking surface and the contact surface along the direction of the elastic umbrella bone tooth arc. The elastic umbrella bone tooth is subjected to a non-eccentric force. The angle between the contact surface and the axis of the umbrella rib tube body and the angle between the snap-fit ​​surface and the axis of the second fixing sleeve are consistent. During the pull-out of the joint, the reaction force of the snap-fit ​​surface of the second fixed sleeve is transmitted along the arc-shaped elastic umbrella tooth, which transforms the eccentric compression of the elastic umbrella tooth in the vertical direction into axial compression along the arc direction of the elastic umbrella tooth and the normal direction of the contact surface. When the joint is subjected to tension, the elastic umbrella-shaped teeth are subjected to pressure, and the deformation of the elastic umbrella-shaped teeth is resisted by the insertion rod.

2. The precast concrete connector according to claim 1, characterized in that: The inner wall of the insertion part of the rod is provided with tension internal threads.

3. The precast concrete connector according to claim 1, characterized in that: The insert and the umbrella rib tube are an integral structure.

4. The precast concrete connector according to claim 1, characterized in that: The plug has a first external thread, and the umbrella rib tube body has a first internal thread. The umbrella rib tube body and the plug are fixedly connected by the first external thread and the first internal thread.

5. A precast concrete pile, comprising a precast concrete pile body, characterized in that: The precast concrete pile body is provided with precast concrete connectors as described in any one of claims 1 to 4 at both ends.

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