Prefabricated concrete pipe piece, concrete ring and concrete cylinder
By introducing steel mesh and steel bones into the pipe sheet of the precast concrete tower, and combining post castable and prestressed steel bars, the existing concrete rings are easily deformed and have poor fatigue resistance under external forces, and higher stiffness and fatigue resistance are achieved.
Patent Information
- Application Number
- CN202420799344.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The concrete rings of existing precast concrete towers are prone to deformation under external forces and have poor fatigue resistance.
By introducing annular steel bars and longitudinal steel bars into the precast concrete pipe sheets, a steel bar mesh is formed, and continuous or separate steel bones are provided between the steel bar mesh, and post castable and prestressed steel bars are combined to form an integral concrete ring and a concrete barrel with a combined connection.
It significantly improves the stiffness and bearing capacity of the concrete ring, enhances fatigue resistance, and improves the bending and shear bearing capacity of the tower connection.
Smart Images
Figure CN222595691U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of precast concrete structures, and particularly relates to a precast concrete pipe segment, a concrete ring and a concrete cylinder. Background Art
[0002] my country is vigorously developing wind power generation, and the tower is an important component. At present, the height of wind power towers has exceeded 100m, and many of them adopt a mixed structure of precast concrete towers and steel towers. Precast concrete towers are composed of precast concrete cylinder sections, which are often relatively large and need to be divided into multiple segments. The segments are connected by bolts through the reserved holes to form concrete cylinder sections. The rings of the concrete cylinder sections are connected by bolts through holes, and the vertical stiffness of the connection area is small, which is easy to deform under the action of external forces. Utility Model Content
[0003] The utility model provides a prefabricated concrete pipe segment, a concrete ring and a concrete cylinder, which achieve the purpose of improving the rigidity of the concrete ring.
[0004] To achieve the above purpose, the utility model adopts the following technical solutions.
[0005] A precast concrete pipe segment, the precast concrete pipe segment comprises precast concrete, steel bars and steel frames; the steel bars comprise circumferential steel bars and longitudinal steel bars; the circumferential steel bars and longitudinal steel bars form a steel mesh; the steel frames are located between the steel meshes; the steel frames extend out of the surface of the precast concrete; the steel frames are continuous or separated; the circumferential steel bars of the pipe segment extend out of the surface of the precast concrete.
[0006] Preferably, the pipe segment is arc-shaped; the longitudinal reinforcement of the pipe segment extends out of the precast concrete surface.
[0007] Preferably, the steel frame is surrounded by a steel cage; the steel cage has closed stirrups.
[0008] Preferably, the steel frame includes a main steel member and an end plate, which are fixedly connected.
[0009] Preferably, the precast concrete ring is formed by annular splicing, and the annular steel bars are connected by sleeve connection, welding or lap connection; there is a vertical connection area along the longitudinal direction of the precast concrete pipe segment; the vertical connection area is located between adjacent annular precast concrete pipe segments; and the vertical post-casting is poured in the vertical connection area.
[0010] Preferably, the annular reinforcement is closed at the ends; and the vertical connection area has additional longitudinal reinforcement.
[0011] Preferably, the precast concrete rings are connected as a whole along the vertical direction; the steel frames are fixedly connected; there is a horizontal connection area along the ring direction of the precast concrete segments; the horizontal connection area is located between adjacent upper and lower precast concrete segments; and the horizontal connection area is cast with horizontal postcast material.
[0012] Preferably, the concrete cylinder is provided with prestressed steel bars; the prestressed steel bars are located inside or outside the precast concrete.
[0013] Compared with the prior art, the utility model has the following characteristics and beneficial effects.
[0014] 1. The precast concrete segments of the concrete ring are connected by steel bars and post-cast to form an integral concrete ring, which improves the rigidity and bearing capacity of the concrete ring and improves its fatigue resistance.
[0015] 2. The upper and lower concrete rings are connected by steel frames, concrete and / or steel bars to form a composite concrete tube, which further improves the bending and shear bearing capacity of the tower tube connection and improves fatigue resistance.
[0016] 3. Some prestressed steel bars are set in the concrete cylinder to form an overall structure, improve its bearing capacity, rigidity and fatigue resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0018] Figure 1 Segment cross section diagram Figure 1 .
[0019] Figure 2 Concrete ring cross section Figure 1 .
[0020] Figure 3 Schematic diagram of the pipe segment elevation Figure 1 .
[0021] Figure 4 Schematic diagram of the upper and lower concrete rings connecting the facade Figure 1 .
[0022] Figure 5 Sectional view of the connection area between the upper and lower concrete rings Figure 1 .
[0023] Figure 6 Schematic diagram of the pipe segment elevation Figure 2 .
[0024] Figure 7 Schematic diagram of the upper and lower concrete rings connecting the facade Figure 2 .
[0025] Figure 8 Schematic diagram of the upper and lower concrete rings connecting the facade Figure 3 .
[0026] Fig. 9 Schematic diagram of the pipe segment elevation Figure 3 .
[0027] Fig.10 Steel skeleton Figure 1 .
[0028] Figure symbols: A-concrete ring, 1-precast concrete, 2-reinforcement, 2.1-circumferential reinforcement, 2.2-longitudinal reinforcement, 3-steel frame, 3.1-main steel member, 3.2-end plate, 4-vertical post-casting, 5-additional longitudinal reinforcement, 6-horizontal post-casting, 7-prestressed reinforcement. DETAILED DESCRIPTION
[0029] In order to better understand the purpose, technical solution and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the utility model and their descriptions are used to explain the utility model, but are not intended to limit the utility model.
[0030] In the description of the present utility model, it is to be understood that the terms "include / comprise", "consist of..." or any other variations thereof are intended to cover non-exclusive inclusion, so that a product, device, process or method including a series of elements includes not only those elements, but also other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of further restrictions, the elements defined by the phrases "include / comprise..." or "consist of..." do not exclude the presence of other identical elements in the product, device, process or method including the elements.
[0031] In the present utility model, unless otherwise clearly specified and limited, the term "fixed connection" should be understood in a broad sense, for example: it can be a sleeve connection, a lap joint, a welding connection, a bolt connection, or a combination of the above connections; the terms "installation", "connection", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components; the term "through-length steel bar" means that the steel bar is continuous without disconnection, or the steel bar is disconnected but the disconnected steel bars are fixedly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0032] The following is a detailed description of the implementation of the present invention using preferred implementation methods in conjunction with the accompanying drawings.
[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, a precast concrete segment includes precast concrete 1, steel bars 2 and steel frames 3. The steel bars 2 include circumferential steel bars 2.1 and longitudinal steel bars 2.2. The circumferential steel bars 2.1 and the longitudinal steel bars 2.2 form a steel mesh. The steel frames 3 are located between the steel meshes. The steel frames 3 extend out of the surface of the precast concrete 1. The steel frames 3 are continuous or separated. The circumferential steel bars 2.1 of the segment extend out of the surface of the precast concrete 1.
[0034] After analysis, it was found that currently, the larger concrete cylinders use segmented segments, which are connected vertically to form concrete rings with bolts on site. This method has low overall rigidity of the concrete ring, is prone to deformation along the vertical direction, and has poor fatigue resistance. The utility model extends the annular steel bars of the concrete segments out of the side of the precast concrete, connects them with the steel bars of the adjacent segments, pours the post-casting, and forms an integral connection between the steel bars and the post-casting. This improves the rigidity and bearing capacity of the concrete ring and its fatigue resistance.
[0035] In specific implementation, the pipe segment is arc-shaped, and the longitudinal reinforcement 2.2 of the pipe segment extends out of the surface of the precast concrete 1. Function: When the concrete ring is connected up and down, the corresponding longitudinal reinforcements are connected correspondingly, and the connection method is sleeve connection, welding or overlap.
[0036] In specific implementation, the periphery of the steel frame 3 is wrapped by a steel cage, and the steel cage has closed stirrups. Function: Under the action of load, confined concrete is formed around the steel frame to improve the force transmission performance of the steel frame.
[0037] When implementing it, Fig. 9 As shown, the steel skeleton 3 is continuous, with both ends exposed to the concrete surface. Function: To improve the mechanical properties, fatigue resistance and durability of the segment.
[0038] When implementing it, Fig.10 As shown, the steel frame 3 includes a main steel part 3.1 and an end plate 3.2, which are fixedly connected. Function: Improve installation speed and fatigue resistance.
[0039] In specific implementation, the precast concrete segments are spliced along the ring shape to form a precast concrete ring A, and the ring-shaped steel bars 2.1 are connected by sleeve connection, welding or lap connection; there is a vertical connection area along the longitudinal direction of the precast concrete segments; the vertical connection area is located between adjacent ring-shaped precast concrete segments; the vertical post-casting 4 is poured in the vertical connection area. The post-casting 4 is concrete or cement mortar.
[0040] The concrete of the utility model includes ordinary concrete, high-strength concrete, fiber concrete, UHPC, grouting material and the like.
[0041] In specific implementation, the annular reinforcement 2.1 is closed at the ends; the vertical connection area has additional longitudinal reinforcement 5. Function: to form local reinforcement at the vertical connection.
[0042] In specific implementation, the precast concrete ring A is connected as a whole along the vertical direction, the steel frame 3 is fixedly connected, and a horizontal connection area is provided along the ring direction of the precast concrete segment; the horizontal connection area is located between adjacent upper and lower precast concrete segments; and the horizontal postcast material 6 is cast in the horizontal connection area.
[0043] The utility model adopts steel frame and post-casting to connect the upper and lower concrete rings. Under the action of horizontal load, when the pressure at the joint is greater than 0, the shear bearing capacity of the steel frame and the friction between the post-casting and the concrete ring jointly provide shear bearing capacity, among which the shear bearing capacity of the steel frame is relatively stable, which can improve the stability of the shear bearing capacity at the joint. When the pressure is 0 or even in a tensile state, the steel frame provides shear bearing capacity, which can effectively improve the shear bearing capacity and stability of the joint, improve its fatigue resistance, and thus improve the safety of the tower. During construction, the upper and lower cylinder sections are connected by steel frames to form a temporary tower structure, which effectively improves the bearing capacity and rigidity of the temporary tower structure and reduces or prevents collapse during construction.
[0044] When implementing it, Figure 7 As shown, the steel skeleton 3 is fixedly connected, the vertical steel bars 2.2 are connected, and the horizontal connection area is poured with horizontal post-casting 6, which is concrete or cement mortar. Function: Form a steel-reinforced concrete composite connection to improve its mechanical resistance and service life.
[0045] During specific implementation, the post-casting material is UHPC.
[0046] When implementing it, Figure 8 As shown, the concrete cylinder is provided with prestressed steel bars 7; the prestressed steel bars 7 are located inside the precast concrete 1 or outside the precast concrete 1. Function: further improve the bearing capacity, rigidity and fatigue resistance of the concrete cylinder.
[0047] In specific implementation, the steel frame is connected by bolting or welding.
[0048] The above embodiments only express several implementation methods of this patent, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of this patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of this utility model patent shall be based on the attached claims.
Claims
1. A precast concrete segment, characterized in that: The precast concrete segment comprises precast concrete (1), steel bars (2) and steel frames (3); the steel bars (2) comprise circumferential steel bars (2.1) and longitudinal steel bars (2.2); the circumferential steel bars (2.1) and longitudinal steel bars (2.2) form a steel mesh; the steel frames (3) are located between the steel meshes; the steel frames (3) extend out of the surface of the precast concrete (1); the steel frames (3) are continuous or separated; the circumferential steel bars (2.1) of the segment extend out of the surface of the precast concrete (1).
2. The precast concrete segment according to claim 1, characterized in that: The longitudinal reinforcement (2.2) of the segment protrudes from the surface of the precast concrete (1).
3. The precast concrete segment according to claim 1, characterized in that: The steel frame (3) is surrounded by a steel cage; the steel cage has closed stirrups.
4. The precast concrete segment according to claim 1, characterized in that: The steel frame (3) comprises a main steel part (3.1) and an end plate (3.2), which are fixedly connected.
5. A prefabricated concrete ring, characterized in that: According to claim 1, the precast concrete segments are spliced along a ring shape to form a precast concrete ring (A), the annular steel bars (2.1) are connected by sleeve connection, welding or overlapping; there are vertical connection areas along the longitudinal direction of the precast concrete segments; the vertical connection areas are located between adjacent annular precast concrete segments; the vertical connection areas are cast with vertical postcast materials (4).
6. The prefabricated concrete ring according to claim 5, characterized in that: The annular reinforcement (2.1) is closed at the ends; the vertical connection area has additional longitudinal reinforcement (5).
7. A concrete cylinder, characterized in that: According to claim 5, the precast concrete ring (A) is connected as a whole along the vertical direction; the steel frame (3) is fixedly connected; there is a horizontal connection area along the circumference of the precast concrete pipe segment; the horizontal connection area is located between adjacent upper and lower precast concrete pipe segments; the horizontal connection area is cast with horizontal post-casting (6).
8. The concrete cylinder according to claim 7, characterized in that: The concrete cylinder is provided with prestressed steel bars (7); the prestressed steel bars (7) are located inside the precast concrete (1) or outside the precast concrete (1).