Grouting connection prestressed concrete precast pile with end plates
By setting sleeve components and insert rods on the end plates of precast piles and using grouting connection, the problems of high environmental requirements for welding processes and high cost of mechanical connectors are solved, achieving efficient and low-cost pile-to-pile connection and meeting the depth requirements of high-rise buildings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG UNIV
- Filing Date
- 2025-07-07
- Publication Date
- 2026-05-19
AI Technical Summary
The existing welding process for precast piles with end plates has high environmental requirements and the welds are prone to corrosion. The mechanical connectors are expensive and the connections are not tight enough, making it difficult to meet the depth requirements of pile foundations for high-rise buildings.
The grouting connection method is adopted. By setting sleeve components and insert rods on the end plates, the prestressed steel bars are fixed by the connecting grout, so as to achieve accurate positioning and simple connection between piles.
It improves the accuracy and strength of the connection between piles, reduces connection costs, simplifies the construction process, and increases construction speed.
Smart Images
Figure CN224259353U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of precast pile technology, specifically to a grout-connected prestressed concrete precast pile with end plates. Background Technology
[0002] Precast concrete piles have advantages such as high structural strength and high construction efficiency, and are widely used in building foundation construction. In the design of pile foundations for high-rise buildings, a deeper pile foundation is required to ensure the stability of the superstructure. Since the length of a single pile is generally insufficient to reach the designed depth, multiple precast piles need to be connected end-to-end and driven downwards until the designed depth is reached.
[0003] Precast concrete piles can be divided into two types based on their pile head structure: precast piles with end plates and precast piles without end plates. Precast piles with end plates have the advantages of high pile head strength during construction, making them less prone to breakage, and the end plates distribute stress at the joint, avoiding stress concentration. Additionally, adjacent pile heads are connected by welding at the outer edges, simplifying the process. However, their main disadvantages are that the welding process requires a high level of environmental control, and the welds are susceptible to corrosion. Precast piles without end plates generally use mechanical connectors, which are simple to operate, have lower environmental requirements, and offer better corrosion resistance. The prestressed steel bars are directly connected via mechanical connectors, resulting in more direct stress and less deformation. However, their disadvantages include higher manufacturing costs for mechanical connectors and the possibility of gaps in the connection, leading to failed inspections. Utility Model Content
[0004] This utility model addresses the shortcomings of existing technologies by proposing a grout-connected prestressed concrete precast pile with end plates. By setting connectors on the end plates and connecting them through grouting, the connectors between the prestressed steel bars not only ensure the strength of the precast pile head, but also have a lower manufacturing cost compared to mechanical connectors, and the connection positioning between piles is more accurate.
[0005] This utility model is achieved through the following technical solution:
[0006] A grouted prestressed concrete precast pile with end plates includes prestressed steel bars, a concrete pile body, end plates, a sleeve assembly, and insert rods. The prestressed steel bars are disposed within the concrete pile body, and the end plates are disposed at both ends of the concrete pile body. The sleeve assembly includes a first sleeve and a second sleeve, both of which are open at one end. The end plates are provided with through holes.
[0007] One end of the prestressed steel bar is connected to the closed end of the first sleeve. The first sleeve passes through the through hole of the end plate and is fixedly connected to the end plate. The open end of the first sleeve is flush with the outer surface of the end plate. The other end of the prestressed steel bar is connected to the closed end of the second sleeve. The second sleeve is inserted into the through hole of the end plate and is fixedly connected to the end plate.
[0008] The insertion rod includes an insertion section and a fixing section. The fixing section is inserted into the open end of the second sleeve and fixedly connected to the second sleeve. The insertion section is inserted into the open end of the first sleeve filled with connecting grout of the adjacent grouting connected prestressed concrete precast pile.
[0009] During the connection process, firstly, a prestressed concrete pile with grouting is constructed at the design position to the connection elevation, with the first sleeve facing upwards. The first sleeve is then filled with connecting grout. Next, the insertion rod is installed in the second sleeve of the second prestressed concrete pile with grouting, with the second sleeve facing downwards and connected to the first prestressed concrete pile with grouting. The insertion rod is inserted into the first sleeve of the first prestressed concrete pile with grouting. At this point, since the connecting grout has not yet solidified, it can well accommodate the insertion section of the insertion rod. After the connecting grout has completely solidified, the insertion rod can be fixed in the first sleeve. After the insertion rod is inserted into the first sleeve, the end plates between the two prestressed concrete piles can be welded without waiting for the connecting grout to completely solidify.
[0010] As a further improvement of this utility model, the insertion section of the insert rod is provided with flanges at uniform intervals along the extension direction. When the insert rod is inserted into the first sleeve and is wrapped by the connecting slurry, the flanges can enhance the contact between the insertion section of the insert rod and the connecting slurry and increase the resistance of the insert rod detaching from the first sleeve.
[0011] As a further improvement of this utility model, the open end of the second sleeve extends through the outer surface of the end plate;
[0012] The open end of the second sleeve is provided with an embedded ring edge, and the open end of the first sleeve is provided with an embedded ring groove for the embedded ring edge to be fitted.
[0013] As a further improvement of this utility model, the open end of the second sleeve is flush with the outer surface of the end plate;
[0014] The insertion rod is further provided with a limiting section between the insertion section and the fixing section. The limiting section is in the shape of a frustum. The end of the frustum with a smaller radius is connected to the insertion section, and the end of the frustum with a larger radius is connected to the fixing section. After the insertion rod is connected to the second sleeve through the fixing section, the end face of the limiting section with a larger frustum radius abuts against the second sleeve.
[0015] The inner wall of the open end of the first sleeve is provided with a conical section corresponding to the limiting section. When the insertion rod is inserted into the first sleeve, the limiting section is completely embedded in the first sleeve.
[0016] As a further improvement of this utility model, the first sleeve and the second sleeve are connected to the through hole by threads or welded.
[0017] As a further improvement of this utility model, the outer surfaces of the first sleeve and the second sleeve are provided with discontinuous bosses, and the opening of the through hole facing the concrete pile body is provided with a discontinuous flange corresponding to the boss. When the first sleeve and the second sleeve are connected to the end plate, the flange blocks the boss, so that the first sleeve and the second sleeve are connected to the through hole as a platform edge.
[0018] As a further improvement of this utility model, the cross-section of the concrete pile is circular or square.
[0019] As a further improvement of this utility model, the concrete pile body is a solid pile body or a hollow pile body.
[0020] As a further improvement of this utility model, it also includes anchoring steel bars, one end of which is fixedly connected to the end plate, and the other end is inserted into the concrete pile body.
[0021] Compared with the prior art, the advantages of this utility model are: while maintaining the advantages of precast piles with end plates, it improves the accuracy of the connection between piles, and the structure is simpler and uses fewer parts than mechanical connectors, which can effectively reduce costs. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 This is an overall structural diagram of the grouting connection prestressed concrete precast pile with end plate of this utility model;
[0024] Figure 2 This is a schematic diagram of the end plate connection of the grouting connection prestressed concrete precast pile with end plate according to this utility model.
[0025] Figure 3This is an installation diagram of the first embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model;
[0026] Figure 4 This is a schematic diagram of the insertion rod structure of the grouting connection prestressed concrete precast pile with end plate of this utility model.
[0027] Figure 5 This is a schematic diagram of the installation of anchoring steel bars for grouting connection of prestressed concrete precast piles with end plates according to this utility model.
[0028] Figure 6 This is a schematic diagram of the sleeve assembly of the first embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model;
[0029] Figure 7 This is an installation diagram of the second embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model;
[0030] Figure 8 This is a schematic diagram of the insert rod assembly of the second embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model;
[0031] Figure 9 This is a schematic diagram of the first sleeve structure of the second embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model;
[0032] Figure 10 This is a three-dimensional schematic diagram of the connection between the first sleeve and the edge of the through hole platform in the third embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model.
[0033] Figure 11 This is a schematic diagram of the threaded connection between the first sleeve and the through hole in the first embodiment of the grouting connection of the prestressed concrete precast pile with end plate of this utility model.
[0034] Figure 12 This is a schematic diagram of the welding connection between the first sleeve and the through hole in another embodiment of the grouting connection of the prestressed concrete precast pile with end plate of this utility model;
[0035] Figure 13 This is a schematic diagram of the connection between the first sleeve and the through-hole platform edge of the third embodiment of the grouting connection prestressed concrete precast pile with end plate of this utility model.
[0036] Figure 14 This is a construction effect diagram of the first embodiment of the prestressed concrete precast pile with end plate of this utility model.
[0037] Figure 15 This is a construction drawing of the connection process of the first embodiment of the prestressed concrete precast pile with end plate of this utility model. Detailed Implementation
[0038] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.
[0040] First Embodiment
[0041] A grouting-connected prestressed concrete precast pile with end plates includes prestressed steel bars 1, a concrete pile body 2, end plates 3, sleeve assemblies, and insertion rods 7. The prestressed steel bars 1 are disposed inside the concrete pile body 2, and the end plates 3 are disposed at both ends of the concrete pile body 2. The sleeve assembly includes a first sleeve 4 and a second sleeve 5, both of which are sleeves with one end open. The end plates 3 are provided with through holes 6.
[0042] One end of the prestressed steel bar 1 is connected to the closed end of the first sleeve 4. The first sleeve 4 passes through the through hole 6 of the end plate 3 and is fixedly connected to the end plate 3. The open end of the first sleeve 4 is flush with the outer surface of the end plate 3. The other end of the prestressed steel bar 1 is connected to the closed end of the second sleeve 5. The second sleeve 5 is inserted into the through hole 6 of the end plate 3 and is fixedly connected to the end plate 3.
[0043] The insertion rod 7 includes an insertion section 8 and a fixing section 9. The fixing section 9 is inserted into the open end of the second sleeve 5 and fixedly connected to the second sleeve 5. The insertion section 8 is inserted into the open end of the first sleeve 4, which is filled with connecting grout, of the adjacent grouting connected prestressed concrete precast pile.
[0044] During the connection process, firstly, a precast prestressed concrete pile with grouting is inserted into the installation hole with the first sleeve 4 facing upwards, and the first sleeve 4 is filled with connecting grout. Next, the insert rod 7 is installed inside the second sleeve 5 of the second precast prestressed concrete pile with grouting, keeping the second sleeve 5 facing downwards to connect with the first precast prestressed concrete pile. The insert rod 7 is inserted into the first sleeve 4 of the first precast prestressed concrete pile. At this point, because the connecting grout has not yet solidified, it can well accommodate the insertion section 8 of the insert rod 7. After the connecting grout has completely solidified, the insert rod 7 can be fixed inside the first sleeve 4. After completing the insertion of the insert rod 7 into the first sleeve 4, the end plates 3 between the two precast prestressed concrete piles can be welded without waiting for the connecting grout to completely solidify, thus improving construction speed. The connecting grout can be concrete slurry with a low sand and gravel content, grout mixed with grouting material, or other adhesives.
[0045] The insertion section 8 of the insert rod 7 is provided with uniformly spaced flanges 10 along the extension direction. When the insert rod 7 is inserted into the first sleeve 4 and is wrapped by the connecting slurry, the flanges 10 can enhance the contact between the insertion section 8 of the insert rod 7 and the connecting slurry and increase the resistance of the insert rod 7 to detach from the first sleeve 4.
[0046] In this embodiment, the open end of the second sleeve 5 protrudes from the outer surface of the end plate 3, and the open end of the second sleeve 5 is provided with an embedded ring edge 11. The open end of the first sleeve 4 is provided with an embedded ring groove 12 for the embedded ring edge 11 to fit into. Through the cooperation of the embedded ring edge 11 and the embedded ring groove 12, the first sleeve 47 and the second sleeve 58 can be fitted together, thereby improving the bending resistance of the connection point.
[0047] In this embodiment, the first sleeve 4 and the second sleeve 5 are fixed to the through hole 6 by a threaded connection, such as... Figure 11 As shown, in other embodiments, the first sleeve 4 and the second sleeve 5 can also be fixed to the through hole 6 by welding, such as... Figure 12 As shown, the edges of the through hole 6 are welded to the edges of the first sleeve 4 and the second sleeve 5 on the inner and outer sides of the end plate 3, respectively. Figure 11 , Figure 12 The connection between the first sleeve 4 and the through hole 6 is used as an example only.
[0048] In this embodiment, anchoring steel bars 13 are also included between the concrete pile 2 and the end plate 3. The anchoring steel bars 13 are evenly arranged circumferentially, with one end of the anchoring steel bar 13 welded and fixed to the end plate 3, and the other end inserted into the concrete pile 2. The anchoring steel bars 13 can improve the connection strength between the concrete pile 2 and the end plate 3. In this embodiment, the number of anchoring steel bars 13 is 8.
[0049] In this embodiment, the concrete pile 2 is a hollow pile with a circular cross-section. Prestressed steel bars 1 are installed inside the concrete pile 2. The end plates 3 on both sides are annular and retain 12 through holes 6, the same number as the prestressed steel bars 1, arranged circumferentially according to their arrangement. Figure 15 As shown.
[0050] In other embodiments, the cross-section of the concrete pile 2 may also be square or other shapes.
[0051] In other embodiments, the concrete pile 2 can also be configured as a solid pile.
[0052] In other embodiments, the concrete pile 2 can also be designed as an irregularly shaped pile with varying cross-section or a pile with uniform cross-section.
[0053] The construction method of the grouted prestressed concrete precast pile with end plate in this embodiment includes the following steps:
[0054] S1: Install the first prestressed concrete precast pile 18 with end plate into the pile hole while keeping the first sleeve 4 facing upwards and fill the first sleeve 4 with connecting grout.
[0055] S2: Install the insert rod 7 inside the second sleeve 5 of the end plate 3 of the second prestressed concrete precast pile 19 with end plate.
[0056] S3: Keep the second prestressed concrete precast pile 19 with end plate facing downwards and hoist it above the first prestressed concrete precast pile 18 with end plate.
[0057] S4: Lower the second prestressed concrete precast pile 19 with end plate so that the insertion rod 7 is inserted into the first sleeve 47 of the first prestressed concrete precast pile 18 with end plate.
[0058] S5: Weld and fix the two end plates 3 at the connection point.
[0059] Second Embodiment
[0060] The difference between this embodiment and the first embodiment is that the open end of the second sleeve 5 is flush with the outer surface of the end plate 3;
[0061] The insertion rod 7 is also provided with a limiting section 14 between the insertion section 8 and the fixing section 9. The limiting section 14 is in the shape of a frustum. The end with the smaller radius of the frustum is connected to the insertion section 8, and the end with the larger radius of the frustum is connected to the fixing section 9. After the insertion rod 7 and the second sleeve 5 are connected through the fixing section 9, the end face of the end with the larger radius of the frustum of the limiting section 14 abuts against the second sleeve 5.
[0062] The inner wall of the open end of the first sleeve 4 is provided with a conical section 15 corresponding to the limiting section 14. When the insert rod 7 is inserted into the first sleeve 4, the limiting section 14 is completely embedded in the first sleeve 4.
[0063] The open end of the second sleeve 5 is flush with the outer surface of the end plate 3, which can ensure that the edge of the second sleeve 5 will not be deformed due to bumps during transportation. By inserting the limiting section 14 of the insertion rod 7 into the conical section 15 of the first sleeve 4, the insertion rod 7 can be fitted with the first sleeve 4, improving the bending resistance of the connection point.
[0064] Third Embodiment
[0065] The difference between this embodiment and the first embodiment is that both the outer surfaces of the first sleeve 4 and the second sleeve 5 are provided with discontinuous bosses 16. The opening of the through hole 6 facing the concrete pile 2 is provided with a discontinuous flange 17 corresponding to the bosses 16. When the first sleeve 4 and the second sleeve 5 are connected to the end plate 3, the flange 17 blocks the bosses 16, causing the first sleeve 4 and the second sleeve 5 to form a platform-like connection with the through hole 6. When the first sleeve 4 and the second sleeve 5 are connected to the end plate 3, rotating the first sleeve 47 or the second sleeve 5 allows the bosses 16 to pass through the gaps between the discontinuous flanges 17. Then, rotating the first sleeve 4 or the second sleeve 5 again allows the bosses 16 to overlap with the flanges 17, thus completing the installation. Figure 13 The diagram only shows the connection between the first sleeve 4 and the through hole 6.
[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.
Claims
1. A grouted prestressed concrete precast pile with end plates, comprising prestressed steel bars, a concrete pile body, end plates, a sleeve assembly, and insert rods, characterized in that: The prestressed steel bars are installed inside the concrete pile, and the end plates are installed at both ends of the concrete pile. The sleeve assembly includes a first sleeve and a second sleeve, both of which are open at one end. The end plate is provided with through holes; One end of the prestressed steel bar is connected to the closed end of the first sleeve. The first sleeve passes through the through hole of the end plate and is fixedly connected to the end plate. The open end of the first sleeve is flush with the outer surface of the end plate. The other end of the prestressed steel bar is connected to the closed end of the second sleeve. The second sleeve is inserted into the through hole of the end plate and is fixedly connected to the end plate. The insertion rod includes an insertion section and a fixing section. The fixing section is inserted into the open end of the second sleeve and fixedly connected to the second sleeve. The insertion section is inserted into the open end of the first sleeve filled with connecting grout of the adjacent grouting connected prestressed concrete precast pile.
2. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The insertion section of the insert rod has flanges that are evenly spaced along its extension direction.
3. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The open end of the second sleeve protrudes through the outer surface of the end plate; The open end of the second sleeve is provided with an embedded ring edge, and the open end of the first sleeve is provided with an embedded ring groove for the embedded ring edge to be fitted.
4. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The open end of the second sleeve is flush with the outer surface of the end plate; The insertion rod is further provided with a limiting section between the insertion section and the fixing section. The limiting section is in the shape of a frustum. The end of the frustum with a smaller radius is connected to the insertion section, and the end of the frustum with a larger radius is connected to the fixing section. After the insertion rod is connected to the second sleeve through the fixing section, the end face of the limiting section with a larger frustum radius abuts against the second sleeve. The inner wall of the open end of the first sleeve is provided with a conical section corresponding to the limiting section. When the insertion rod is inserted into the first sleeve, the limiting section is completely embedded in the first sleeve.
5. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The first sleeve and the second sleeve are connected to the through hole by threads or welded.
6. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The outer surfaces of the first sleeve and the second sleeve are provided with discontinuous bosses. The opening of the through hole facing the concrete pile body is provided with a discontinuous flange corresponding to the boss. When the first sleeve and the second sleeve are connected to the end plate, the flange blocks the boss, so that the first sleeve and the second sleeve are connected to the through hole as a platform edge.
7. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The concrete pile has a circular or square cross-section.
8. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: The concrete pile can be a solid pile or a hollow pile.
9. The grouted prestressed concrete precast pile with end plates according to claim 1, characterized in that: It also includes anchoring steel bars, one end of which is fixedly connected to the end plate, and the other end is inserted into the concrete pile body.