Insert for end part of concrete pile with pre-tightening mechanical joint

Abstract

The utility model discloses an insert for the end part of a concrete pile with a pre-tightening mechanical joint. The insert comprises an end surface shielding part and a pre-tightening mechanical joint, wherein the end surface shielding part is propped against the end surface of a nut sleeve so as to shield the end surface of the nut sleeve; the insertion groove forming part is used for forming a driving screw insertion groove in the end face of the precast pile; and the opening groove sealing part is used for being clamped into an opening groove in the side wall of the nut sleeve so as to seal the opening groove. According to the insert disclosed by the invention, the effect that the driving screw insertion groove communicating with the opening groove in the outer side wall of the precast pile and the opening groove in the side wall of the nut sleeve is formed in the end of the precast pile is achieved, then after the precast piles are connected, the driving screw is inserted into the driving screw insertion groove to drive the pre-tightening nut, the pre-tightening nut and the insertion rod are axially locked, and gaps between the precast piles are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of precast pile connection, in particular to an insert used at the end of a concrete pile with a pre-tightening mechanical joint. Background Art

[0002] Generally, engineering piles (precast piles) are multi-section piles. The existing ends of precast concrete piles are generally quickly connected between piles through mechanical joints.

[0003] However, after the existing mechanical joints are used to connect precast piles, there will be a gap between the connecting end faces of the two precast piles, resulting in unqualified detection when using small-strain detection to check the integrity of the formed pile; at the same time, there will be a gap between the connecting end faces of the two precast piles, and further, during the pile sinking process, the connecting end faces of the precast piles will be damaged or the piles will burst.

[0004] To solve the problem that there will be a gap between the connecting end faces of two precast piles after the existing mechanical joints are used to connect precast piles, relevant technical personnel have developed a pre-tightening mechanical joint, which includes components such as a large nut sleeve, a small nut sleeve, an insertion rod, and a pre-tightening nut. The small nut sleeve is connected to the insertion rod. The large nut sleeve is provided with a pre-tightening nut, and the pre-tightening nut is provided with a transmission part. After the insertion rod is inserted into the pre-tightening nut, the transmission part can be driven by a driving screw from the side of the pre-tightening nut, so that the pre-tightening nut moves along the axial direction of the large nut sleeve, thereby realizing the locking of the insertion rod and the pre-tightening nut and eliminating the gap at the end of the precast pile.

[0005] However, when connecting precast piles through a pre-tightening mechanical joint, it is necessary to insert a driving screw from the outside of the precast pile after the mechanical joint is connected, and the driving screw is used to drive the pre-tightening nut to rotate to realize the locking of the insertion rod and the pre-tightening nut. That is, a driving screw insertion groove needs to be left at the end of the precast pile to facilitate the driving screw to be inserted into the precast pile and drive the pre-tightening nut to rotate. Therefore, there is an urgent need for an insert that can form a driving screw insertion groove during the forming process of the precast pile. Summary of the Utility Model

[0006] The utility model provides an insert used at the end of a concrete pile with a pre-tightening mechanical joint for the above problems.

[0007] The technical means adopted by the utility model are as follows:

[0008] An insert used at the end of a concrete pile with a pre-tightening mechanical joint, comprising:

[0009] An end face shielding part used to abut against the end face of the nut sleeve to shield the end face of the nut sleeve;

[0010] An insertion groove forming part used to form a driving screw insertion groove on the end face of the precast pile; and,

[0011] An opening groove sealing portion for being snapped into an opening groove on the side wall of a nut sleeve to seal the opening groove.

[0012] Further, a cross-section of the end face shielding portion is an annular structure, and one end face of the end face shielding portion is an end abutting face abutting against the end face of the nut sleeve.

[0013] Further, a seal is provided between the inner diameter of the annular structure and the outer diameter of a tensioning screw screwed into the nut sleeve.

[0014] Further, the other end face of the end face shielding portion is a tensioning plate abutting face, and an insert positioning portion for positioning an insert on the tensioning plate is further provided on the tensioning plate abutting face.

[0015] Further, an outer diameter of the insert positioning portion is smaller than an outer diameter of the end face shielding portion.

[0016] Further, the insertion groove forming portion is a strip-shaped block structure arranged along a side edge of the end face shielding portion and extending outward in a tangential direction.

[0017] Further, a side face of the strip-shaped block structure away from the tensioning plate is an arc face.

[0018] Further, the opening groove sealing portion is a convex structure extending along an axial direction of the end face shielding portion at an intersection region between the end face shielding portion and the insertion groove forming portion. The opening groove sealing portion includes an opening groove sealing portion arc face for cooperating with the outer diameter of a tensioning screw screwed into the nut sleeve, a bottom face of the opening groove sealing portion for contacting a bottom face of the opening groove, and two side faces of the opening groove sealing portion for respectively contacting two side faces of the opening groove.

[0019] Compared with the prior art, the insert for the end of a concrete pile with a pre-tightening mechanical joint disclosed by the present utility model has the following beneficial effects: For the insert disclosed in this application, by providing an end face shielding portion, an insertion groove forming portion, and an opening groove sealing portion, it can effectively shield the nut sleeve during the casting process of a precast pile to prevent concrete slurry from entering the nut sleeve. At the same time, it can conveniently form a driving screw insertion groove communicating the outer side wall of the precast pile and the opening groove on the side wall of the nut sleeve at the end of the precast pile. Furthermore, after the precast piles are connected, a driving screw is inserted into the driving screw insertion groove to drive a pre-tightening nut, and the pre-tightening nut is axially locked with the inserting rod to eliminate the gap between the precast piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an axonometric view in a first direction of the insert for the end of a concrete pile with a pre-tightening mechanical joint disclosed by the present utility model;

[0021] Figure 2Axial view in the second direction of the insert for the end of a concrete pile with a pre-tensioned mechanical joint, disclosed by the present utility model;

[0022] Figure 3 Schematic structural view of the connection between the insert and the nut sleeve;

[0023] Figure 4 Structural view of the nut sleeve;

[0024] Figure 5 Schematic view of the installation of the tensioning plate, insert and nut sleeve;

[0025] Figure 6 Schematic structural view of the precast pile in this application;

[0026] Figure 7 For Figure 6 Enlarged view of the dashed box A in;

[0027] Figure 8 For Figure 6 Enlarged view of the dashed box B in;

[0028] In the figure: 1. Insert; 10. End face shielding part; 11. Insertion groove forming part; 12. Open groove sealing part; 120. Arc surface of the open groove sealing part; 121. Bottom surface of the open groove sealing part; 122. Side surface of the open groove sealing part; 13. End face abutting surface; 14. Tensioning plate abutting surface; 15. Insert positioning part; 16. Arc surface; 2. Nut sleeve; 20. Open groove; 3. Precast pile; 30. Driving screw insert groove; 4. Tensioning plate; 5. Driving screw; 6. Pre-tightening nut. Detailed implementation manner

[0029] As Figure 1 And Figure 2 Shown is the insert 1 for the end of a concrete pile with a pre-tensioned mechanical joint, disclosed by the present utility model, including:

[0030] An end face shielding part 10 for abutting against the end face of the nut sleeve 2 to shield the end face of the nut sleeve 2;

[0031] An insertion groove forming part 11 for forming a driving screw insertion groove 30 on the end face of the precast pile 3; and,

[0032] An open groove sealing part 12 for being clamped into an open groove 20 on the side wall of the nut sleeve 2 to seal the open groove 20.

[0033] Specifically, as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 And Figure 8The figure shows a schematic diagram of the end structure of a precast pile connected by a pre-tightening mechanical joint. The precast pile is provided with main reinforcement bars, and both ends of the main reinforcement bars are connected to nut sleeves (one end is called a large nut sleeve, and the other end is called a small nut sleeve). The small nut sleeve is connected to an insertion rod, and a pre-tightening nut is arranged inside the large nut sleeve. When two adjacent precast piles are connected, the insertion rod can be inserted into the pre-tightening nut and engaged with each other to realize the connection of the precast piles. However, due to factors such as component installation or inclination of the pile end face, the insertion rod and the pre-tightening nut cannot be fully engaged, that is, there will be a certain axial gap between the insertion rod and the pre-tightening nut, which will cause a gap between the ends of the precast piles, thereby affecting the connection performance of the piles. In this application, a driving screw insertion groove 30 is provided at the end of the precast pile 3. The driving screw 5 can be inserted into the driving screw insertion groove 30, and the pre-tightening nut 6 is driven to rotate through the opening groove on the side wall of the nut sleeve. Then, the pre-tightening nut moves axially along the nut sleeve to eliminate the axial gap between the insertion rod and the pre-tightening nut, thereby eliminating the gap between the ends of the precast piles.

[0034] In order to form a driving screw insertion groove at the end of the precast pile in this application to facilitate the driving screw to drive the pre-tightening nut, this insert is set before the precast pile is poured. Specifically, before the precast pile is poured, the steel reinforcement cage needs to be set in the precast pile mold. The steel reinforcement cage includes main reinforcement bars and stirrups. Large nut sleeves and small nut sleeves are respectively arranged at both ends of the main reinforcement bars. The stirrups are arranged around the main reinforcement bars. One end of the main reinforcement bar provided with the small nut sleeve is fixed on the fixed plate at one end of the precast pile mold through a screw. One end of the main reinforcement bar provided with the large nut sleeve is connected to a tensioning plate through a tensioning screw. This insert is arranged between the large nut sleeve and the tensioning plate 4. Specifically, the end face shielding part of this insert abuts against the end of the nut sleeve (large nut sleeve), and the opening groove sealing part is clamped into the opening groove on the side wall of the nut sleeve. The insertion rod forming part extends outward from one end of the opening groove sealing part to the template (the side wall of the precast pile when the precast pile is formed), and the other side of this insert contacts the end face of the tensioning plate. By setting this insert, after the precast pile is poured, the tensioning plate and the insert are removed, and a driving screw insertion groove will be formed at one end of the precast pile provided with the large nut sleeve (as shown in Figure 6 and Figure 7 ). And the driving screw insertion groove communicates with the side wall of the precast pile and the opening groove of the nut sleeve, so that after the precast piles are connected, the driving screw can be inserted into the driving screw insertion groove, and the pre-tightening nut is driven to rotate through the opening groove on the side wall of the nut sleeve. Then, the pre-tightening nut moves axially along the nut sleeve to eliminate the axial gap between the insertion rod and the pre-tightening nut, thereby eliminating the gap between the ends of the precast piles.

[0035] Furthermore, the cross-section of the end face shielding part 10 is a circular ring structure, and one end face of the end face shielding part 10 is an end abutting face 13 that abuts against the end face of the nut sleeve 2.

[0036] Specifically, in this embodiment, the cross-section of the end face shielding portion is a circular ring structure. The circular ring structure can effectively shield the end face of the nut sleeve, preventing concrete slurry from entering between the end face of the precast pile and the insert during the pouring of the precast pile, which may affect the subsequent connection between piles. At the same time, the inner diameter of the circular ring structure allows the tensioning screw to pass through the insert and connect to the nut sleeve conveniently.

[0037] Further, there is a seal between the inner diameter of the circular ring structure and the outer diameter of the tensioning screw screwed into the nut sleeve 2.

[0038] Specifically, by providing a seal between the inner diameter of the circular ring structure and the outer diameter of the tensioning screw screwed into the nut sleeve, it can prevent concrete slurry from entering the nut sleeve between the insert and the tensioning screw during the pouring of the precast pile, which may affect the subsequent connection between piles.

[0039] Further, the other end face of the end face shielding portion 10 is a tensioning plate abutting surface 14, and an insert positioning portion 15 for positioning the insert on the tensioning plate is also provided on the tensioning plate abutting surface 14.

[0040] Specifically, the end face shielding portion is a circular ring structure. One end is an end abutting surface abutting against the end face of the nut sleeve, and the other end is a tensioning plate abutting surface in contact with the tensioning plate, so as to prevent the entry of concrete slurry through the seal between the insert, the nut sleeve and the tensioning plate. At the same time, an insert positioning portion for positioning the insert on the tensioning plate is also provided on the tensioning plate abutting surface. In this embodiment, the insert positioning portion is also a circular ring structure, and a circular positioning hole is provided on the tensioning plate. When the insert is installed between the nut sleeve and the tensioning plate, the insert positioning portion is located in the circular positioning hole on the tensioning plate, which is convenient for ensuring the positioning between the insert and the tensioning plate and guaranteeing the quality of the subsequent precast pile.

[0041] Further, the outer diameter of the insert positioning portion 15 is smaller than the outer diameter of the end face shielding portion 10.

[0042] Specifically, in this embodiment, the outer diameter of the insert positioning portion is smaller than the outer diameter of the end face shielding portion, which can increase the contact area between the insert and the tensioning plate, thereby effectively achieving the seal between the insert for the nut sleeve and the tensioning plate and preventing concrete slurry from entering the nut sleeve.

[0043] Further, the insertion groove forming portion 11 is a strip-shaped block structure arranged along the side of the end face shielding portion 10 and extending outward in the tangential direction.

[0044] Further, the side surface of the strip-shaped block structure away from the tensioning plate is an arc surface 16.

[0045] Specifically, the insertion groove forming part is in the structure of a strip-shaped block, and the side surface away from the tensioning plate is an arc surface, which can make the driving screw insertion groove close to the shape of the driving screw, thereby reducing the gap between the driving screw and the driving screw insertion groove. Furthermore, the strength of the end of the precast pile is ensured by the driving screw, avoiding the reduction of the strength of the pile end caused by the excessive gap between the moving screw and the driving screw insertion groove. In this embodiment, a long strip groove structure communicating with the circular positioning hole is further provided on the side of the tensioning plate facing the insert. The setting of the long strip groove structure enables the insertion groove forming part (a small part close to the tensioning plate side) to be inserted into the long strip groove structure when the insert is placed between the nut sleeve and the tensioning plate, thereby realizing the rapid positioning of the insert.

[0046] Furthermore, the opening groove sealing part 12 is a convex structure extending along the axial direction of the end surface shielding part at the intersection area of the end surface shielding part and the insertion groove forming part. The opening groove sealing part 12 includes an opening groove sealing part arc surface 120 for matching with the outer diameter of the tensioning screw screwed into the nut sleeve 2, an opening groove sealing part bottom surface 121 for contacting the groove bottom surface of the opening groove 20, and two opening groove sealing part side surfaces 122 respectively for contacting the two side surfaces of the opening groove 20.

[0047] In this embodiment, the opening groove sealing part is a convex structure extending along the axial direction of the end surface shielding part at the intersection area of the end surface shielding part and the insertion groove forming part. By setting the opening groove sealing part arc surface, the opening groove sealing part bottom surface and the opening groove sealing part side surface, that is, by the contact of each surface of the opening groove sealing part with each surface of the opening groove of the nut sleeve, the sealing at the opening groove is realized. At the same time, by setting the opening groove sealing part, the correct installation orientation of the nut sleeve can be conveniently ensured, and the installation difficulty is reduced.

[0048] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent replacements or changes, and all should be covered by the protection scope of the present invention.

Claims

1. An insert for the end of a concrete pile having a pre-tightened mechanical joint, characterized in that, Comprising: An end face shielding portion for abutting against the end face of the nut sleeve to shield the end face of the nut sleeve; An insertion groove forming portion for forming a driving screw insertion groove on the end face of the precast pile; and, An opening groove sealing portion for being snapped into an opening groove on the side wall of the nut sleeve to seal the opening groove.

2. The insert for the end of a concrete pile having a pre-tightened mechanical joint according to claim 1, characterized in that: The cross-section of the end face shielding portion is an annular structure, and one end face of the end face shielding portion is an end abutting face for abutting against the end face of the nut sleeve.

3. The insert for the end of a concrete pile having a pre-tensioned mechanical joint according to claim 2, characterized in that: A seal is provided between the inner diameter of the annular structure and the outer diameter of the tensioning screw screwed into the nut sleeve.

4. The insert for the end of a concrete pile with a pre-tensioned mechanical joint according to claim 3, characterized in that: The other end face of the end face shielding portion is a tensioning plate abutting face, and an insert positioning portion for positioning the insert on the tensioning plate is further provided on the tensioning plate abutting face.

5. The insert for the end of a concrete pile having a pre-tensioned mechanical joint according to claim 4, characterized in that: The outer diameter of the insert positioning portion is smaller than the outer diameter of the end face shielding portion.

6. The insert for the end of a concrete pile having a pre-tightened mechanical joint according to any one of claims 1-5, characterized in that: The insertion groove forming portion is a strip-shaped block structure arranged along the side of the end face shielding portion and extending outward in the tangential direction.

7. The insert for the end of a concrete pile having a pre-tensioned mechanical joint according to claim 6, characterized in that: The side face of the strip-shaped block structure away from the tensioning plate is an arc face.

8. The insert for the end of a concrete pile having a pre-tensioned mechanical joint according to claim 7, characterized in that: The opening groove sealing portion is a convex structure extending along the axial direction of the end face shielding portion in the intersection region of the end face shielding portion and the insertion groove forming portion. The opening groove sealing portion includes an opening groove sealing portion arc face for cooperating with the outer diameter of the tensioning screw screwed into the nut sleeve, an opening groove sealing portion bottom face for contacting the bottom face of the opening groove, and two opening groove sealing portion side faces for respectively contacting the two side faces of the opening groove.

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