Precast concrete connector with teeth and precast concrete pile

Abstract

The present invention discloses a precast concrete connector with teeth and a precast concrete pile, wherein the precast concrete connector with teeth comprises an insert rod, a rib tube, a first fixed sleeve and a second fixed sleeve; the insert rod comprises a base and a plug arranged on the base; the rib tube comprises a rib tube body and elastic rib teeth uniformly distributed at one end of the rib tube body, the elastic rib teeth open outward from one end of the rib tube body to a free end along the radial direction of the rib tube body, and an outer clamping tooth is arranged on the outer side wall of the free end of the elastic rib teeth; a tooth groove is arranged on the inner side wall of the second fixed sleeve, and when the insert rod is inserted into the second fixed sleeve, the outer clamping tooth and the tooth groove are engaged with each other. The precast concrete connector with teeth has the advantages of simple structure, high connection strength and tensile bearing capacity, and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of precast concrete connection, in particular to a precast concrete connector with teeth and a precast concrete pile. Background Art

[0002] In the process of construction, the connection between the main reinforcement of precast concrete components is indispensable. The traditional butt joint of precast concrete pipe piles is achieved by welding between the steel plates at the ends of the piles. However, due to the limitation of the welding process, only the outer circle of the end plate is welded, and the other 95% of the area of ​​the end plate is not processed. The connection of the pile body is uneven and insufficient, which will lead to low tensile and bending resistance of the pile body. In addition, the traditional welding process will cause poor corrosion resistance due to the exposure of the rigid end plate, and the components cannot be tightly connected. Summary of the invention

[0003] In view of the above problems, the present invention provides a prefabricated concrete connector with teeth.

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

[0005] A prefabricated concrete connector with teeth, comprising an insert rod, an umbrella rib tube, a first fixing sleeve and a second fixing sleeve;

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

[0007] The rib tube comprises a sleeve-shaped rib tube body and a plurality of elastic rib teeth uniformly distributed at one end of the rib tube body, the other end of the elastic rib teeth is a free end, the elastic rib teeth are spread outward from one end of the rib tube body to the free end along the radial direction of the rib tube body, and at least one layer of external clamping teeth is arranged on the outer side wall of the free end of the elastic rib teeth; the rib tube is sleeved on the plug and fixedly connected to the plug through the rib tube body, and the free end of the elastic rib teeth faces one end of the base;

[0008] One end of the first fixing sleeve is a first main rib fixing portion, and the other end is an insertion rod fixing portion, and the base is fixedly connected to the insertion rod fixing portion;

[0009] One end of the second fixed sleeve is a second main rib fixing portion, and the other end is a rod insertion portion. At least one layer of tooth grooves is provided on the inner side wall of the rod insertion portion. When the rod is inserted into the second fixed sleeve through the rod insertion portion, the external teeth and the tooth grooves engage with each other.

[0010] Furthermore, a tensioned internal thread is provided on the inner side wall of the insertion rod insertion portion between the tooth groove and the insertion rod insertion opening.

[0011] Furthermore, a tensioning internal thread is provided on the inner side wall of the insertion portion of the rod between the tooth groove and the second main rib fixing portion.

[0012] Furthermore, there are multiple external teeth, including first external teeth and second external teeth. A layer of external teeth close to the rib tube body is the first external teeth, and the tooth height of the first external teeth is greater than the tooth spacing between two adjacent second external teeth.

[0013] Furthermore, a rib tube wrapping surface is provided on the inner side wall of the rod insertion portion between the tooth groove and the second main rib fixing portion, and the rib wrapping surface includes a first wrapping surface for wrapping the rib tube body and a conical second wrapping surface for wrapping the elastic rib teeth.

[0014] Furthermore, the external clamping tooth includes a first clamping surface, and when the elastic rib teeth are in an open state, the angle between the first clamping surface and the axis of the rib tube body is 30 to 80°, and the tooth socket includes a second clamping surface, and the angle between the second clamping surface and the axis of the second fixing sleeve is 30 to 80°.

[0015] Furthermore, an included angle between the first engaging surface and the axis of the rib tube body is consistent with an included angle between the second engaging surface and the axis of the second fixing sleeve.

[0016] Furthermore, the insertion rod and the umbrella rib tube are an integrated structure.

[0017] Furthermore, the plug is provided with a first external thread, the rib tube body is provided with a first internal thread, and the rib tube body and the plug are fixedly connected via the first external thread and the first internal thread.

[0018] A precast concrete pile comprises a precast concrete pile body. Both ends of the precast concrete pile body are provided with the precast concrete connectors with teeth disclosed in the present invention.

[0019] Compared with the prior art, the precast concrete connector with teeth disclosed in the present invention has the following beneficial effects: the precast concrete connector disclosed in the present invention comprises an insertion rod, a rib tube, a first fixed sleeve and a second fixed sleeve, the rib tube is fixed on the insertion rod, the rib tube has elastic rib teeth, the outer side wall of the elastic rib teeth is provided with external clamping teeth, and the second fixed sleeve is provided with a tooth groove. When the insertion rod is inserted into the second fixed sleeve, the rib tube can be quickly and firmly clamped with the second fixed sleeve, thereby improving the tensile and pull-out resistance of the concrete connector, ensuring the connection strength between the concrete piles, and having good integrity and stability, and high tensile bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A structural diagram of a first embodiment of a precast concrete connector with teeth disclosed in the invention;

[0021] Figure 2a It is the front view of the umbrella rib tube;

[0022] Figure 2b for Figure 2a Left view of

[0023] Figure 2c for Figure 2a Right view of;

[0024] Figure 2d for Figure 2c A cross-sectional view at the middle AA of FIG.

[0025] Figure 3 It is the structural diagram of the plug rod;

[0026] Figure 4 is a structural diagram of a first fixed sleeve;

[0027] Figure 5 is a structural diagram of a first embodiment of a second fixed sleeve;

[0028] Figure 6 It is a schematic diagram of the connection between the first embodiment of the second fixing sleeve and the umbrella rib tube;

[0029] Figure 7 is a structural diagram of a second embodiment of a second fixed sleeve;

[0030] Figure 8 A schematic diagram of the connection between the second embodiment of the second fixing sleeve and the rib tube;

[0031] Fig. 9 The present invention discloses a precast concrete pile.

[0032] In the figure: 1, plug, 10, base, 11, plug, 12, first external thread, 2, rib tube, 20, rib tube body, 21, elastic rib teeth, 22, external clamping teeth, 220, first external clamping teeth, 221, second external clamping teeth, 23, first internal thread, 24, groove, 25, first engaging surface, 3, first fixing sleeve, 30, first main reinforcement fixing part, 31, plug rod fixing part, 32, first main reinforcement fixing hole, 4, second fixing sleeve, 40, second main reinforcement fixing part, 440, first wrapping surface, 441, second wrapping surface, 41, plug rod insertion part, 42, tooth groove, 43, second engaging surface, 44, tensioning internal thread, 45, second main reinforcement fixing hole, 7, main reinforcement, 8, precast concrete pile body. DETAILED DESCRIPTION

[0033] Example 1

[0034] like Figure 1 The figure shows a prefabricated concrete connector with teeth disclosed in the present invention, comprising an insert rod 1, an umbrella rib tube 2, a first fixing sleeve 3 and a second fixing sleeve 4;

[0035] like Figure 3 As shown, the plug rod 1 includes a base 10 and a plug 11 disposed on the base 10;

[0036] like Figure 2a , Figure 2b , Figure 2c and Figure 2d As shown, the rib tube 2 comprises a sleeve-shaped rib tube body 20 and a plurality of elastic rib teeth 21 uniformly distributed at one end of the rib tube body 20, the other end of the elastic rib teeth 21 being a free end, and a groove 24 being provided between two adjacent elastic rib teeth to enable the elastic rib teeth 21 to open outwardly along the radial direction of the rib tube body 20 from one end of the rib tube body 20 to the free end, and at least one layer of external clamping teeth 22 being provided on the outer side wall of the free end of the elastic rib teeth 21; the rib tube 2 is sleeved on the plug 11 and fixedly connected to the plug 11 through the rib tube body 20, and the free end of the elastic rib teeth 21 faces one end of the base 10;

[0037] like Figure 4 As shown, one end of the first fixing sleeve 3 is a first main reinforcement fixing part 30, and the other end is a plug rod fixing part 31, and the base 10 is fixedly connected to the plug rod fixing part 31. Specifically, a first main reinforcement fixing hole 32 is provided on the first main reinforcement fixing part 30, and the end of the main reinforcement in the precast concrete pile passes through the first main reinforcement fixing hole 32 and is fixed in the first main reinforcement fixing part. The main reinforcement can be a PC steel bar, a steel strand or a threaded steel bar, etc. The corresponding first main reinforcement fixing part can be a pier head card table, a tapered hole or a threaded hole, etc. The specific structure can be selected according to needs. In this embodiment, an external thread is provided on the base 10, and an internal thread is provided in the plug rod fixing part 31, and the base of the plug rod is threadedly fixedly connected to the plug rod fixing part;

[0038] like Figure 5 or Figure 6As shown, one end of the second fixing sleeve 4 is a second main reinforcement fixing part 40, and the other end is a plug rod insertion part 41. The inner side wall of the plug rod insertion part 41 is provided with at least one tooth groove 42 that cooperates with the external tooth. When the plug rod 1 is inserted into the second fixing sleeve 4 through the plug rod insertion part 41, the external tooth 22 and the tooth groove 42 are engaged with each other. Specifically, a second main reinforcement fixing part 40 is provided with a second main reinforcement fixing hole 45. The end of the main reinforcement in the precast concrete pile passes through the second main reinforcement fixing hole 45 and is fixed in the second main reinforcement fixing part. The main reinforcement can be a structure such as a PC steel bar, a steel strand or a threaded steel bar. The corresponding The first main reinforcement fixing part can be a pier head clamp, a conical hole or a threaded hole, etc. The specific structure can be selected as needed. The outer wall of the free end of the elastic rib tooth 21 is provided with at least one layer of external clamping teeth 22. The multi-layer external clamping teeth means multiple circles of external clamping teeth arranged on the outer wall of the elastic rib tooth, and each circle of external clamping teeth is a layer. The inner wall of the plug rod insertion part 41 is provided with at least one tooth groove 42 that cooperates with the external clamping teeth. When the plug rod with the rib tube is inserted into the second fixed sleeve, the elastic rib tooth opens outward to realize the clamping connection between the tooth groove and the external clamping teeth, thereby realizing the clamping connection between the plug rod and the second fixed sleeve. The precast concrete connector with teeth disclosed in the present invention has the advantages of simple structure and high tensile and pull-out resistance, thereby ensuring the connection strength between concrete piles. At the same time, since several layers of outer teeth can be arranged on the outer side wall of the elastic rib teeth, when the connecting member is subjected to tension, the pressure on the rib tube can be evenly dispersed to the teeth of each layer, thus avoiding the occurrence of stress concentration problems and ensuring the life of the connecting member.

[0039] like Figure 5 and Figure 6 The figure shows a structural diagram of a first embodiment of the second fixed sleeve in the present invention. In this embodiment, a tensioning internal thread 44 is provided on the inner wall of the rod insertion portion 41 of the second fixed sleeve 4 between the tooth groove 42 and the rod insertion port 46. The tensioning internal thread 44 can facilitate the tensioning of the main reinforcement connected to the fixed sleeve by tensioning screws during the production process of precast concrete piles, so that the product can take into account both tensioning and connection functions, which can meet the tensioning process in the production stage and the connection of components in the construction stage, thereby achieving the purpose of one piece for multiple uses, not only reducing cumbersome processes, but also reducing costs, and greatly increasing the overall tensile strength of the connecting piece.

[0040] Furthermore, if Figure 5 and Figure 6As shown, a rib tube wrapping surface is also provided on the inner side wall of the rod insertion portion 41 of the second fixed sleeve 4 between the tooth groove 42 and the second main rib fixing portion 40, and the rib wrapping surface includes a first wrapping surface 440 for wrapping the rib tube body 20 and a conical second wrapping surface 441 for wrapping the elastic rib teeth 21, and the inner diameter of the wrapping surface is adapted to the outer diameter of the rib tube, the first wrapping surface 440 is used to wrap the rib tube body, and the second wrapping surface 441 is a conical surface for wrapping the portion of the elastic rib tooth that is not provided with an external clamping tooth. Since the wrapping surface is provided, the elastic rib teeth are arranged in an outwardly opened state (the outer diameter of the free end of the elastic rib teeth is large, and the outer diameter of one end of the rib tube body is small). Therefore, when the component is subjected to the ultimate tensile force, the rib tube will tend to expand and bend toward the periphery under the action of the ultimate pressure. This outward expansion trend will make the embedding and bite of the outer teeth of the elastic rib teeth and the tooth grooves of the second fixed sleeve tighter and more reliable. In addition, since the parts of the elastic rib tube body and the elastic rib teeth that are not provided with outer teeth are also respectively supported by the wrapping surface of the second fixed sleeve, all deformation tendencies of the rib tube will be resisted and deformation cannot occur. This design can greatly improve the ultimate tensile performance and safety factor of the joint.

[0041] Further, as shown in FIG. 2 , the outer teeth 22 have a plurality of teeth, and the outer teeth 22 in the figure are 5. The outer teeth 22 include a first outer tooth 220 and a second outer tooth 221. The outer teeth of a layer close to the rib tube body 20 are the first outer teeth 220, and the tooth height H of the first outer teeth 220 is greater than the tooth spacing h of two adjacent second outer teeth 221. Since the tooth height H of the first outer teeth 220 is greater than the tooth spacing h of two adjacent second outer teeth 221, when the rib tube is inserted into the second fixed sleeve, the elastic rib teeth are squeezed and contracted and tend to spring outwards. However, since the height of the first outer teeth is greater than the tooth spacing h of the second outer teeth 221 (the distance of the tooth grooves of the second fixed sleeve), when the first outer teeth are not inserted to the position of the first tooth grooves of the second fixed sleeve, the elastic rib teeth cannot spring outwards. This design avoids the situation in which the outer teeth of the rib tube pass through each second fixed sleeve during the insertion process. When the rib tube is inserted into the small tooth groove of the fixed sleeve, the elastic rib teeth will bounce out the outer teeth to bite the tooth groove, and then as the rib tube continues to be inserted, the elastic rib teeth will be squeezed and contracted again, and will bounce out again when passing the next tooth groove. This process is repeated, which places high demands on the strength, elasticity, repeated load fatigue resistance of the elastic rib teeth, and wear resistance of the outer teeth and the tooth groove. The design of the present invention can avoid all the above disadvantages. According to the design of the present invention, only when the first outer teeth are inserted to the position of the first tooth groove in the second fixed sleeve, the fin will bounce outward, and all the outer teeth will also be tightly engaged with the tooth groove.

[0042] Furthermore, if Figure 2d and Figure 5 As shown, the outer clamping teeth 22 include a first clamping surface 25. When the elastic rib teeth 21 are in the open state, the angle a between the first clamping surface 25 and the axis (BB) of the rib tube body 20 is 30 to 80°. The tooth groove 42 includes a second clamping surface 43. The angle b between the second clamping surface 43 and the axis (CC) of the second fixed sleeve is 30 to 80°, that is, the first clamping surface and the second clamping surface are both inclined surfaces. Preferably, the angle between the first clamping surface and the axis of the rib tube body and the angle between the second clamping surface and the axis of the second fixed sleeve are consistent. The first clamping surface and the second clamping surface are both inclined surfaces, which further increases the area of ​​the bite overlap between the two components. When the component is subjected to tension, the occurrence of stress concentration problems can be avoided, the connection strength is improved, and the service life of the connecting member is guaranteed. Furthermore, when the precast concrete pile is subjected to a pulling force, a pulling force is generated between the insertion rod and the second fixed sleeve. At this time, a force is generated between the first engaging surface and the second engaging surface. Since the first engaging surface is inclined relative to the axis of the rib tube body, the force will be along the direction of the elastic rib teeth. The elastic rib teeth are subjected to non-eccentric force and will not be deformed, thereby ensuring the strength of the rib tube.

[0043] Furthermore, the outer wall surface of the elastic rib teeth is an arc-shaped structure from one end of the rib tube body to the free end. Figure 2a and Figure 2d As shown, the outer wall surface of the elastic rib tooth 21 is an arc structure from one end of the rib tube body 20 to the free end, that is, the elastic rib tooth is a smooth arc structure (DD in the figure is the center line of the rib tube, and DD is approximately an arc line). In the present invention, the elastic rib tooth is an arc structure to further avoid stress concentration. Furthermore, the elastic rib tooth is an arc and the first engaging surface is an inclined surface. When the joint is pulled out, the reaction force direction of the second engaging surface of the second fixing sleeve is transmitted along the arc elastic rib tooth (F1 in the figure represents force). This design cleverly converts the eccentric pressure of the elastic rib tooth in the original vertical direction into axial pressure along the arc direction of the elastic rib tooth and the normal direction of the first engaging surface, thereby avoiding the occurrence of eccentric force on the elastic rib tooth, making the structure more reliable and the joint more resistant to pull out.

[0044] The insert rod 1 and the rib tube 2 of the present invention can be welded into an integral structure, or can be cast or processed into an integral structure in other ways. Preferably, the insert rod and the rib tube are separate structures and then assembled into one. In this embodiment, the plug 11 is provided with a first external thread 12, and the rib tube body 20 is provided with a first internal thread 23. The rib tube body 20 and the plug 11 are fixedly connected by the first external thread 12 and the first internal thread 23. The insert rod and the rib tube are separate structures, which is convenient for the processing of each component. At the same time, the rib tube and the insert rod can be installed in advance by the manufacturer without taking up construction time, which improves the efficiency of the construction stage and saves time cost.

[0045] Furthermore, in the connector disclosed in the present invention, the outer diameter of the base of the plug rod is the same as the inner diameter of the first fixed sleeve and is smaller than the size of the insertion port of the second fixed sleeve. The plug rod can be completely inserted into the second fixed sleeve. Therefore, when the concrete pile is plugged in, the first fixed sleeve and the second fixed sleeve can be tightly fitted, which not only ensures the accuracy of the insertion of the plug rod, but also forms an enclosed space. The plug rod can be completely enclosed in the sealed space, isolating it from air, water and the surrounding complex environment, thereby achieving the effect of anti-corrosion of the joint.

[0046] Example 2

[0047] like Figure 7 and Figure 8 The second embodiment of the precast concrete connector disclosed in the present invention is shown. The difference between this embodiment and the first embodiment is that in the first embodiment, the second fixing sleeve ( Figure 5 The tensioning internal thread (as shown) is arranged on the inner wall between the tooth groove and the insertion opening of the rod insertion part 41, that is, the tensioning internal thread is arranged on the inner wall of the second fixed sleeve near the insertion end of the rod. In this embodiment, the tensioning internal thread 44 is arranged on the inner wall of the rod insertion part 41 between the tooth groove 42 and the second main rib fixing part 40.

[0048] The tensioning threads of existing precast concrete connectors are all set at one end where the plug rod is inserted (such as the structure in Example 1). During the production process of precast concrete piles, the fixing sleeve is connected by the tensioning screws and the main reinforcement is tensioned. At the same time, after the concrete component is laid, the concrete needs to be vibrated and compacted or centrifugally formed. During 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 in the fixing sleeve to form a cement block (it may solidify in the tooth socket). As a result, when the plug rod of the subsequent connector is inserted into the fixing sleeve, the plug rod and the fixing sleeve are not firmly connected or even cannot be connected due to the presence of the cement block, causing the connector to lose its connection function, which in turn causes the connection of the entire concrete pile to fail. In this embodiment, Figure 7As shown, the tensioning internal thread 44 is arranged on the insertion portion 41 of the plug rod, between the tooth groove 42 and the second main reinforcement fixing portion 40. In this embodiment, the tensioning internal thread is arranged on the first wrapping surface. Therefore, in the process of tensioning the main reinforcement by the tensioning screw and performing concrete vibration compaction molding or centrifugal molding after the concrete member is laid, since the tensioning screw is connected to the inner wall of the second fixing sleeve close to one end of the main reinforcement fixing portion, the tensioning screw blocks one end of the main reinforcement fixing hole and the end with the tooth 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 side of the main reinforcement fixing portion and cannot enter the side with the tooth groove, which will not affect the subsequent insertion process of the plug-in rod and the second fixing sleeve, thereby ensuring the insertion quality of the plug-in rod and the connecting sleeve, and further ensuring the insertion quality and efficiency of the concrete pile.

[0049] Furthermore, in the prestressed steel bar tensioning process of precast concrete piles, the tensioning screws used are M27 in the industry standard, so the existing joint connectors on the market, especially the sizes of plugs, are limited to the size range of M27, which can easily lead to problems such as insufficient connection strength of the connectors. In the present invention, since the tensioning internal thread 44 is arranged on the inner wall of the second fixing sleeve near one end of the second main reinforcement fixing portion, and a tooth groove portion is arranged at the end near the insertion of the insertion rod, the size of the fixing sleeve is not limited, so the insertion rod of the present invention can be thicker and the thickness of the elastic rib teeth can be larger, and thus the tensile bearing capacity of the joint can be made higher.

[0050] Example 3

[0051] like Fig. 9 The figure shows the precast concrete pile disclosed in the present invention, including a precast concrete pile body 8, both ends of which are provided with the precast concrete connectors with teeth disclosed in the present invention. Specifically, the main reinforcement of the steel cage of the precast concrete pile body 8 is fixed with a first fixed sleeve and a second fixed sleeve at both ends, and an inserted rod is provided in the first fixed sleeve.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A precast concrete connector with teeth, characterized in that: It includes an inserting rod, an umbrella rib tube, a first fixing sleeve and a second fixing sleeve; The plug rod comprises a base and a plug arranged on the base; The rib tube comprises a sleeve-shaped rib tube body and a plurality of elastic rib teeth uniformly distributed at one end of the rib tube body, the other end of the elastic rib teeth is a free end, the elastic rib teeth are spread outward from one end of the rib tube body to the free end along the radial direction of the rib tube body, and at least one layer of external clamping teeth is arranged on the outer side wall of the free end of the elastic rib teeth; the rib tube is sleeved on the plug and fixedly connected to the plug through the rib tube body, and the free end of the elastic rib teeth faces one end of the base; One end of the first fixing sleeve is a first main rib fixing portion, and the other end is an insertion rod fixing portion, and the base is fixedly connected to the insertion rod fixing portion; One end of the second fixing sleeve is a second main rib fixing portion, and the other end is a plug rod insertion portion, and at least one layer of tooth grooves is provided on the inner side wall of the plug rod insertion portion, and when the plug rod is inserted into the second fixing sleeve through the plug rod insertion portion, the external clamping teeth and the tooth grooves are engaged with each other; There are multiple external teeth, including first external teeth and second external teeth. A layer of external teeth close to the rib tube body is the first external teeth. The tooth height of the first external teeth is greater than the tooth spacing between two adjacent second external teeth, so that when the rib tube is inserted into the second fixed sleeve and before the first external teeth are engaged with the first tooth grooves in the second fixed sleeve, the tooth grooves in the second fixed sleeve limit the elastic rib teeth from springing outward.

2. The precast concrete connector with teeth according to claim 1, characterized in that: The inner side wall of the insertion rod insertion portion between the tooth groove and the insertion rod insertion opening is provided with a tensioning internal thread.

3. The precast concrete connector with teeth according to claim 1, characterized in that: The inner wall of the insertion portion of the rod is located between the tooth groove and the second main rib fixing portion and is provided with a tensioning internal thread.

4. The precast concrete connector with teeth according to claim 1, characterized in that: A rib tube wrapping surface is also provided on the inner side wall of the rod insertion portion between the tooth groove and the second main rib fixing portion, and the rib tube wrapping surface includes a first wrapping surface for wrapping the rib tube body and a conical second wrapping surface for wrapping the elastic rib teeth.

5. The precast concrete connector with teeth according to claim 4, characterized in that: The external clamping teeth include a first clamping surface. When the elastic rib teeth are in an open state, the angle between the first clamping surface and the axis of the rib tube body is 30 to 80°. The tooth socket includes a second clamping surface. The angle between the second clamping surface and the axis of the second fixing sleeve is 30 to 80°.

6. The precast concrete connector with teeth according to claim 5, characterized in that: The included angle between the first engaging surface and the axis of the rib tube body is consistent with the included angle between the second engaging surface and the axis of the second fixing sleeve.

7. The precast concrete connector with teeth according to claim 1, characterized in that: The inserting rod and the umbrella rib tube are an integrated structure.

8. The precast concrete connector with teeth according to claim 1, characterized in that: The plug is provided with a first external thread, the rib tube body is provided with a first internal thread, and the rib tube body and the plug are fixedly connected via the first external thread and the first internal thread.

9. A precast concrete pile, comprising a precast concrete pile body, characterized in that: The two ends of the precast concrete pile body are provided with the precast concrete connecting pieces with teeth as claimed in any one of claims 1 to 8.

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