Post-grouting PHC tubular pile
By designing a combination of annular disk and grouting tank in PHC pipe piles, the problem of insufficient pile length and difficulty in connecting grouting pipes in clay and other soil layers is solved, and efficient and high-quality construction results are achieved.
Patent Information
- Application Number
- CN202421518637.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-30
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-30
AI Technical Summary
In soil layer environments with small bearing capacity such as clay, silt and soft soil, the pile length of PHC pipe piles is difficult to meet the design needs at one time. Since the pipe piles are cylinders, the docking of grouting pipes is difficult, which affects the construction progress.
A post-grouting PHC pipe pile structure is designed, using a combination of an annular disk and a grouting tank to connect the grouting pipe through the docking of the annular disk, simplifying the pile connection process, and maintaining standard sections in the factory to reduce costs.
This structure effectively improves construction efficiency and quality, reduces the difficulty of pile connection, and ensures that the depth and bearing capacity of the pipe pile meet the design requirements.
Smart Images
Figure CN222771461U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building construction, and in particular relates to a post-grouting PHC pipe pile. Background Art
[0002] PHC piles (prestressed high-strength concrete piles) are widely used in building foundations due to their advantages of quick and convenient construction, stable and reliable quality, and good durability. In soil environments with low bearing capacity such as clay, silt and soft soil, the pile ends can generally be strengthened by post-grouting to improve the bearing capacity of the pile foundation. Due to production, transportation and construction reasons, the length of prestressed high-strength concrete piles often cannot meet the design requirements at one time, and the piles must be connected on site during piling. Since PHC piles are standard sections prefabricated in the factory and do not have the grouting function, grouting pipes need to be arranged and installed during post-grouting. Since PHC piles are cylindrical, their circumferential angle position is difficult to locate, resulting in difficulty in docking the grouting pipes. At the same time, the docking parts of the grouting pipes need to be welded and fixed, and the operating space is limited, which affects the overall construction progress.
[0003] Therefore, it is necessary to provide a new PHC pipe pile structure that is conducive to pile connection and post-grouting construction, so as to improve construction efficiency and improve construction quality. Utility Model Content
[0004] In view of this, the purpose of the utility model is to provide a post-grouting PHC pipe pile. The post-grouting PHC pipe pile structure can be beneficial to pile connection and post-grouting construction, which can effectively improve construction efficiency and enhance construction quality.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a post-grouting PHC pipe pile, comprising an upper section PHC pipe pile, a lower section PHC pipe pile, an upper section grouting pipe and a lower section grouting pipe correspondingly arranged in the upper section PHC pipe pile and the lower section PHC pipe pile, the bottom end of the upper section PHC pipe pile is coaxially fixedly connected with an annular disk I, the top end of the lower section PHC pipe pile is coaxially fixedly connected with an annular disk II, the annular disk I is fixedly connected to the annular disk II, and an annular grouting groove is provided at the butt joint of the annular disk I and the annular disk II, the lower end of the upper section grouting pipe is fixed to the annular disk I and communicated with the annular grouting groove, the upper end of the lower section grouting pipe is fixed to the annular disk II and communicated with the annular grouting groove, the bottom end of the lower section PHC pipe pile is fixedly connected with a pile tip, a grouting hole is provided on the pile tip, the lower end of the lower section grouting pipe is fixed to the pile tip and communicated with the grouting hole, and the grouting hole is provided with a plug that can be pushed open by the grouting pressure.
[0006] Furthermore, the annular grouting groove is arranged on the top surface of the annular disk II, and the bottom end of the annular disk I is integrally formed with an annular protrusion which is clamped in the annular grouting groove.
[0007] Furthermore, an annular sealing gasket I is fixed on the outer diameter surface of the annular protrusion, and an annular sealing gasket II is fixed on the inner diameter surface of the annular protrusion.
[0008] Furthermore, a guide bevel is provided on the top of the annular grouting groove.
[0009] Furthermore, the top end surface of the annular disk I is integrally formed with an annular limit platform I sleeved on the inner wall of the upper PHC pipe pile, and the bottom end surface of the annular disk II is integrally formed with an annular limit platform II sleeved on the inner wall of the lower PHC pipe pile.
[0010] Furthermore, the upper grouting pipe and the lower grouting pipe are two symmetrically arranged along the center line of the pipe pile, and the grouting holes are two vertically arranged and aligned with the lower grouting pipe.
[0011] Furthermore, the top end of the plug is sleeved inside the bottom end of the lower grouting pipe.
[0012] Furthermore, the bottom end of the plug is conical.
[0013] Furthermore, the pile tip is a conical steel cone tip.
[0014] Furthermore, a limiting truncated cone is integrally formed at the top of the pile tip and is sleeved on the inner wall of the lower section of the PHC pipe pile.
[0015] The beneficial effects of the utility model are as follows:
[0016] The post-grouting PHC pipe pile structure provided by the utility model can be beneficial to the pile connection and post-grouting construction, can effectively improve the construction efficiency, and improve the construction quality; specifically, the upper section grouting pipe and the lower section grouting pipe can be provided to facilitate the post-grouting construction after the pile is sunk, because the upper section PHC pipe pile and the lower section PHC pipe pile are connected by the corresponding annular disk, and the annular grouting groove can complete the connection between the upper section grouting pipe and the lower section grouting pipe. When connecting the piles, there is no need to consider the alignment of the grouting pipes, which reduces the difficulty of connecting the piles; at the same time, when connecting the piles, the upper section PHC pipe pile and The upper section of the grouting pipe can be hoisted as a whole to complete the pile connection, eliminating the need for a separate grouting pipe connection process; since the upper section of the grouting pipe and the lower section of the grouting pipe are respectively arranged in the upper section of the PHC pipe pile and the lower section of the PHC pipe pile, it does not affect the manufacturing process of the upper section of the PHC pipe pile and the lower section of the PHC pipe pile in the factory, and standard sections can be used to reduce costs; since the use of pile connections can ensure that the depth of the pipe pile meets the design requirements, the quality of the PHC pipe pile body is good, and the pile end can be directly strengthened by post-grouting, which can effectively ensure that the bearing capacity of the single pile meets the standard and improve the construction quality.
[0017] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model.
[0019] Figure 2 Schematic diagram of the explosion structure of the annular disk Ⅰ3 and the annular disk Ⅱ4 of the utility model
[0020] Figure markings: 1-upper section PHC pile; 101-upper section grouting pipe; 2-lower section PHC pile; 201-lower section grouting pipe; 3-annular disk I; 301-annular protrusion; 301a-annular sealing pad I; 301b-annular sealing pad II; 302-annular limiting platform I; 4-annular disk II; 401-annular grouting groove; 402-annular limiting platform II; 5-pile tip; 501-grouting hole; 502-plug; 6-fixing ring. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0022] See also Figure 1-2The present embodiment discloses a post-grouting PHC pipe pile, comprising an upper section PHC pipe pile 1, a lower section PHC pipe pile 2, an upper section grouting pipe 101 and a lower section grouting pipe 201 which are correspondingly arranged in the upper section PHC pipe pile 1 and the lower section PHC pipe pile 2, the lower end of the upper section PHC pipe pile 1 is coaxially fixedly connected with an annular disk I3, the top of the lower section PHC pipe pile 2 is coaxially fixedly connected with an annular disk II4, the annular disk I3 is fixedly connected with the annular disk II4, and an annular grouting groove 401 is provided at the butt joint of the annular disk I3 and the annular disk II4, the lower end of the upper section grouting pipe 101 is fixed to the annular disk I3 and communicated with the annular grouting groove 401, the upper end of the lower section grouting pipe 201 is fixedly connected with the annular disk II4 and communicated with the annular grouting groove 401, the lower end of the lower section PHC pipe pile 2 is fixedly connected with a pile tip 5, the pile tip 5 is provided with a grouting hole 501, the lower end of the lower section grouting pipe 201 is fixedly connected with the pile tip 5 and communicated with the pile tip 5 The grouting hole 501 is connected, and the grouting hole 501 is provided with a plug 502 that can be pushed open by the grouting pressure; it is explained here that the fixed connection mentioned in this paragraph is preferably completed by welding; in addition, the top of the upper grouting pipe 101 can be fixed to the upper PHC pile 1 through the fixing ring 6 to ensure the stable connection of the upper grouting pipe 101 to the upper PHC pile 1; in addition, the upper grouting pipe 101 and the lower grouting pipe 201 are preferably made of steel pipes. During the post-grouting, the grouting equipment is connected to the upper grouting pipe 101 through the pipe fitting to complete the grouting construction; the setting of the annular grouting groove 401 makes it unnecessary to consider the angle position of the docking when the annular disk I3 and the annular disk II4 are docked, as long as the upper PHC pile 1 and the lower PHC pile 2 are coaxially aligned, and the alignment of the piles can be done by using a guide sleeve like the alignment of conventional piles; the annular disk structure has a through hole in the center, which does not affect the backfilling of the center hole of the pile in the later stage;
[0023] The above-mentioned post-grouting PHC pipe pile structure can facilitate pile connection and post-grouting construction, can effectively improve construction efficiency and improve construction quality; specifically, the upper section grouting pipe 101 and the lower section grouting pipe 201 can be arranged to facilitate post-grouting construction after pile sinking is completed, because the upper section PHC pipe pile 1 and the lower section PHC pipe pile 2 are connected by corresponding annular plates, and the annular grouting groove 401 can complete the connection between the upper section grouting pipe 101 and the lower section grouting pipe 201. When connecting piles, there is no need to consider the alignment of the grouting pipes, which reduces the difficulty of connecting piles; at the same time, when connecting piles, the upper section PHC pipe pile 101 and the lower section PHC pipe pile 201 are connected. The C pipe pile and the upper section grouting pipe can be hoisted together as a whole to complete the pile connection, eliminating the need for a separate grouting pipe connection process; since the upper section grouting pipe and the lower section grouting pipe are respectively arranged in the upper section PHC pipe pile 1 and the lower section PHC pipe pile 2, the manufacturing process of the upper section PHC pipe pile 1 and the lower section PHC pipe pile 2 in the factory is not affected, and standard sections can be used to reduce costs; since the use of pile connection can ensure that the pipe pile depth meets the design requirements, the quality of the PHC pipe pile body is good, and the pile end can be directly strengthened by post-grouting, it can effectively ensure that the single pile bearing capacity meets the standard, thereby improving the construction quality.
[0024] In the present embodiment, the annular grouting groove 401 is arranged on the top surface of the annular disk II 4, and the bottom end of the annular disk I3 is integrally formed with an annular protrusion 301 which is snap-fitted to the annular grouting groove 401; this structural design is beneficial to improving the docking connection strength between the annular disk I3 and the annular disk II 4, improving the shear resistance of the connection part, and further improving the construction quality. Of course, it can be understood that the annular protrusion 301 is preferably matched with a small gap in the annular grouting groove 401; in addition, this structural design can also help to ensure the coaxiality of the upper and lower section pipe piles, that is, to ensure the verticality of the pile body after the piles are connected.
[0025] In this embodiment, an annular sealing gasket I 301a is provided on the fixed outer sleeve on the outer diameter surface of the annular protrusion 301, and an annular sealing gasket II 301b is provided on the fixed inner sleeve on the inner diameter surface of the annular protrusion 301; the annular sealing gasket I 301a and the annular sealing gasket II 301b are preferably metal sealing gaskets, which can be fixed by interference fit; by providing the annular sealing gasket I 301a and the annular sealing gasket II 301b, the sealing performance of the mating surfaces of the annular disk I 3 and the annular disk II 4 is improved, and pressure release during grouting is avoided, which is beneficial to further improve the grouting effect of the pile end and further improve the construction quality.
[0026] In this embodiment, a guiding angle 401a is provided at the top of the annular grouting groove 401. By providing the guiding angle 401a, it can play a guiding role when connecting piles, further improving the efficiency of connecting piles.
[0027] In this embodiment, the top end surface of the annular disk I3 is integrally formed with an annular limit platform I302 which is sleeved on the inner wall of the upper section PHC pipe pile 1, and the bottom end surface of the annular disk II4 is integrally formed with an annular limit platform II402 which is sleeved on the inner wall of the lower section PHC pipe pile 2. The integral molding ensures good structural strength. By designing the annular limit platform I302 and the annular limit platform II402, it is beneficial to further improve the connection reliability of the corresponding connection parts and further improve the construction quality.
[0028] In this embodiment, the upper grouting pipe 101 and the lower grouting pipe 201 are two symmetrically arranged along the center line of the pipe pile, and the grouting holes 501 are two aligned with the lower grouting pipe 201 and vertically arranged. The vertical arrangement of the grouting holes 501 is conducive to the installation of the lower grouting pipe 201. By designing two groups of grouting pipes, it is beneficial to improve the grouting efficiency and further improve the construction efficiency. At the same time, it is beneficial for the slurry to spread around and further improve the construction quality.
[0029] In this embodiment, the top end of the plug 502 is inserted into the bottom end of the lower section of the grouting pipe 201. Here, the plug 502 and the lower section of the grouting pipe 201 have a small interference fit, ensuring that the plug 502 can be pushed open by the grouting pressure; by inserting the top end of the plug 502 into the lower section of the grouting pipe 201, the lower section of the grouting pipe 201 can form a reliable limit for the plug 502, which is conducive to ensuring reliable sealing.
[0030] In this embodiment, the bottom end of the plug 502 is conical, and here it is a circular cone. The conical design facilitates the plug 502 to break through the bottom soil layer during grouting, thereby reducing the risk of the plug 502 getting stuck.
[0031] In this embodiment, the pile tip 5 is a conical steel cone tip. The use of a conical steel cone tip is beneficial to improving the sinking efficiency of the pipe pile, has a good ground-breaking effect, and has reliable strength, which is beneficial to further improving the construction efficiency.
[0032] In this embodiment, the top of the pile tip 5 is integrally formed with a limiting truncated cone 503 which is sleeved on the inner wall of the lower PHC pipe pile 2. The structure is reliable, which is beneficial to improving the connection strength of the connection part between the pile tip 5 and the lower PHC pipe pile 2, and is beneficial to further improving the construction quality.
[0033] The above-mentioned post-grouting PHC pile can be implemented according to the following steps:
[0034] S1: prefabricated upper PHC pile 1, lower PHC pile 2, annular plate I 3, annular plate II 4, pile tip 5, fixing ring 6, upper grouting pipe 101 and lower grouting pipe 201;
[0035] S2: Complete the assembly of the lower section PHC pile 2, pile tip 5, lower section grouting pipe 201 and annular plate II 4, and complete the assembly of the upper section PHC pile 1, annular plate I 3, fixing ring 6 and upper section grouting pipe 101. Here, the corresponding connections of the parts are preferably completed by welding;
[0036] S3: sinking the assembled lower PHC pile 2, pile tip 5, lower grouting pipe 201 and annular plate II 4, and then hoisting and docking the assembled upper PHC pile 1, annular plate I 3, fixing ring 6 and upper grouting pipe 101 to the top of annular plate II 4 to complete the pile connection. Here, the sinking of the lower PHC pile 2 is the same as the existing PHC pile sinking process, such as sinking by hammering, which will not be repeated here;
[0037] S4: Continue sinking piles until the set depth;
[0038] S5: After grouting is completed in the upper grouting pipe 101 through the grouting equipment, grouting construction is carried out;
[0039] In the construction method, the lower section PHC pile 2 and the lower section grouting pipe 201 and the upper section grouting pipe 101 and the upper section PHC pile 1 are respectively docked as a whole, which is convenient for docking and installation, eliminates the need for separate grouting pipe docking, and improves construction efficiency.
[0040] Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.
Claims
1. A post-grouting PHC pile, characterized in that: The invention comprises an upper PHC pipe pile (1), a lower PHC pipe pile (2), an upper grouting pipe (101) and a lower grouting pipe (201) which are arranged in the upper PHC pipe pile (1) and the lower PHC pipe pile (2) respectively, wherein the bottom end of the upper PHC pipe pile (1) is coaxially fixedly connected with an annular disk I (3), the top end of the lower PHC pipe pile (2) is coaxially fixedly connected with an annular disk II (4), the annular disk I (3) is fixedly connected with the annular disk II (4), and an annular grouting groove (401) is provided at the butt joint between the annular disk I (3) and the annular disk II (4) The lower end of the upper grouting pipe (101) is fixed to the annular disk I (3) and is connected to the annular grouting groove (401); the upper end of the lower grouting pipe (201) is fixed to the annular disk II (4) and is connected to the annular grouting groove (401); the bottom end of the lower PHC pipe pile (2) is fixedly connected to a pile tip (5); a grouting hole (501) is provided on the pile tip (5); the lower end of the lower grouting pipe (201) is fixed to the pile tip (5) and is connected to the grouting hole (501); and the grouting hole (501) is provided with a plug (502) that can be pushed open by grouting pressure.
2. The post-grouting PHC pile according to claim 1, characterized in that: The annular grouting groove (401) is arranged on the top surface of the annular disk II (4), and the bottom end of the annular disk I (3) is integrally formed with an annular protrusion (301) which is clamped in the annular grouting groove (401).
3. The post-grouting PHC pile according to claim 2, characterized in that: An annular sealing gasket I (301a) is fixedly disposed on the outer diameter surface of the annular protrusion (301), and an annular sealing gasket II (301b) is fixedly disposed on the inner diameter surface of the annular protrusion (301).
4. The post-grouting PHC pile according to claim 2, characterized in that: The top of the annular grouting groove (401) is provided with a guiding bevel (401a).
5. The post-grouting PHC pile according to claim 2, characterized in that: The top end surface of the annular disk I (3) is integrally formed with an annular limit platform I (302) sleeved on the inner wall of the upper PHC pipe pile (1), and the bottom end surface of the annular disk II (4) is integrally formed with an annular limit platform II (402) sleeved on the inner wall of the lower PHC pipe pile (2).
6. The post-grouting PHC pile according to claim 1, characterized in that: The upper grouting pipe (101) and the lower grouting pipe (201) are two symmetrically arranged along the center line of the pipe pile, and the grouting holes (501) are two vertically arranged and aligned with the lower grouting pipe (201).
7. The post-grouting PHC pile according to claim 6, characterized in that: The top end of the plug (502) is sleeved inside the bottom end of the lower grouting pipe (201).
8. The post-grouting PHC pile according to claim 7, characterized in that: The bottom end of the plug (502) is conical.
9. The post-grouting PHC pile according to claim 1, characterized in that: The pile tip (5) is a conical steel cone tip.
10. The post-grouting PHC pile according to claim 9, characterized in that: The top end of the pile tip (5) is integrally formed with a limiting truncated cone (503) sleeved on the inner wall of the lower PHC pipe pile (2).