Prefabricated T-beam structure combining reactive powder concrete and common concrete
By using components such as H-shaped steel, wire mesh and reinforcement plates in the prefabricated T-beam structure, the connection strength between reactive powder concrete and ordinary concrete is enhanced, the problem of insufficient flange connection strength is solved, and high bearing capacity and improved seismic performance are achieved.
Patent Information
- Application Number
- CN202422230536.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-09-12
AI Technical Summary
In the prior art, when a prefabricated T-beam structure combining reactive powder concrete and ordinary concrete is subjected to bending moment, the flange connection strength is insufficient, which easily causes the reactive powder concrete to fall off, and the connection position lacks effective connection strength.
H-shaped steel is used as the skeleton, combined with wire mesh, internal stirrups and angle bars. Connectors and reinforcement plates are set on the wire mesh to enhance the connection strength between reactive powder concrete and ordinary concrete, and short columns and reinforcement plates are inserted to enhance the bending resistance.
The structural bearing capacity and seismic performance of precast T-beams are improved, the number of load-bearing wall columns in the design is reduced, the construction process is simplified, and maintenance costs are reduced, while the high strength and durability of reactive powder concrete are fully utilized.
Smart Images
Figure CN223423497U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of precast concrete and relates to a precast T-beam structure combining active powder concrete and ordinary concrete. Background Art
[0002] Reactive powder concrete (RPC) is a new material developed in the 1990s that features ultra-high strength, high toughness, high durability, and excellent volume stability. It is primarily used in construction projects such as bridges. A T-beam is a beam with a T-shaped cross-section. The projecting portions on either side are called flanges, and the middle portion is called the beam rib. Currently, some T-beams are prefabricated to ensure construction schedules. One current research area is how to combine RPC with conventional concrete to enhance strength, toughness, and durability. This approach can increase strength and ductility without adding external structures, significantly improving the seismic performance of the structure and effectively reducing the cross-sectional dimensions of the components.
[0003] The protruding portions on either side of a T-beam are called flanges, while the center portion is called the rib. The design concept of a T-beam is to remove the concrete in the tensile zone of a rectangular beam, which does not contribute to bending strength, thereby forming a T-shaped cross-section. Existing precast components made of reactive powder concrete wrapped around ordinary concrete present the following problems:
[0004] 1) When a T-beam is subjected to bending moments, the flanges effectively distribute and bear the load, while the ribs provide essential structural support and stability. Therefore, the flanges are the primary working area of the T-beam, responsible for bearing and distributing external loads, while the ribs reinforce the structure. Therefore, the upper portion of the T-beam is treated with reactive powder concrete to enhance its strength and toughness.
[0005] 2) The connection between the reactive powder concrete and the ordinary concrete lacks connection strength, which makes the reactive powder concrete easy to fall off.
[0006] In summary, the present invention proposes a prefabricated T-beam structure combining reactive powder concrete and ordinary concrete. Summary of the Invention
[0007] In order to solve the above technical problems, the inventors have come up with the technical solution of the present utility model through practice and summary. The present utility model discloses that the basic concept of the technical solution adopted by the present utility model to solve the above technical problems is:
[0008] A precast T-beam structure combining reactive powder concrete and ordinary concrete, including H-shaped steel;
[0009] The H-shaped steel is placed horizontally in an I-shape, and a steel mesh is installed at a level 1 / 2 of the H-shaped steel; the bottom of the steel mesh is cast with ordinary concrete, and the top is cast with active powder concrete;
[0010] Internal stirrups and corner bars are laid on the outside of the H-shaped steel. There are multiple groups of corner bars. The internal stirrups are distributed around the corner bars in a rectangular shape. The internal stirrups are connected to the wire mesh, and the H-shaped steel is located inside the internal stirrups.
[0011] In a further technical solution, construction eyes and connectors are opened on the wire mesh, and the wire mesh is fixedly connected to the H-shaped steel; the connector is located at the upper end of the connection between the wire mesh and the internal stirrups, and the bottom of the connector is suitable for connecting the wire mesh.
[0012] In a further technical solution, the connecting member includes an inner cylinder, which is fixed on the internal stirrups, an outer cylinder is installed on the outside of the inner cylinder, and a connecting hook is installed at the bottom of the outer cylinder, and the bottom of the connecting hook hooks the mesh of the wire mesh.
[0013] In a further technical solution, an external thread is provided on the outside of the inner cylinder, and the external thread of the inner cylinder is connected to the outer cylinder body; a large diameter portion is provided at the bottom of the outer cylinder body, and a connecting bearing is installed in the large diameter portion, the outer ring of the connecting bearing is fixedly connected to the large diameter portion, and the inner ring of the connecting bearing is fixedly installed with an annular boss, and the bottom of the annular boss is fixedly connected to the top of the connecting hook.
[0014] In a further technical solution, two groups of connecting hooks are provided and both are installed at an angle and distributed in an "eight" shape.
[0015] In a further technical solution, short columns are installed on both the upper and lower sides of the steel mesh, and the short columns are suitable for being connected to the reactive powder concrete and ordinary concrete respectively.
[0016] In a further technical solution, a reinforcing plate is provided in the middle of the H-shaped steel, and two groups of reinforcing plates are provided on the upper and lower sides of the wire mesh; the reinforcing plate is welded to the wire mesh, and multiple groups of filter holes are opened on the reinforcing plate.
[0017] Beneficial effects
[0018] The utility model has the following advantages:
[0019] 1. The utility model has a large structural bearing capacity, high rigidity and good seismic performance, which can meet the design requirements of large span and large bay structure design, reduce the number of load-bearing wall columns in the design, enhance the aesthetics of the building design, and simplify the construction process, which can shorten the construction period to a certain extent and reduce the maintenance cost during subsequent use;
[0020] 2. The utility model uses active powder concrete in the upper part of the beam and ordinary concrete in the lower part, which saves construction cost while giving full play to its advantages of high compressive performance and durability;
[0021] 3. The utility model installs an outer cylinder that can move up and down on the internal stirrups, and the connecting hook installed at the bottom can be hung on the wire mesh to prevent the wire mesh from floating up and down.
[0022] 4. The utility model sets reinforcing plates on both sides of the H-shaped steel to enhance the connection strength with the steel mesh and enhance the bending strength. The filter holes are convenient for spot welding the steel mesh and the reinforcing plates, and can also fully contact with ordinary concrete or reactive powder concrete to ensure the connection strength of the contact surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0024] Figure 1 This is a side cross-sectional view of the prefabricated T-beam of Example 1 of the present utility model;
[0025] Figure 2 This is a side cross-sectional view of a prefabricated T-beam according to Example 2 of the present utility model;
[0026] Figure 3 for Figure 2 A magnified view of part A;
[0027] Figure 4 This is a schematic structural diagram of the inner cylinder, outer cylinder and connecting hook of Example 2 of the present utility model;
[0028] Figure 5 This is a structural diagram of the annular boss of Example 2 of the present utility model;
[0029] Figure 6 This is a side cross-sectional view of a prefabricated T-beam according to Example 3 of the present utility model;
[0030] Figure 7 It is a structural schematic diagram of the H-shaped steel of the present utility model.
[0031] In the figure: 1. Internal stirrups; 2. H-shaped steel; 3. Reactive powder concrete; 4. Steel mesh; 5. Ordinary concrete; 6. Angle reinforcement; 7. Inner cylinder; 8. Outer cylinder; 9. Connecting hook; 10. Large diameter part; 11. Connecting bearing; 12. Annular boss; 13. Insert short column; 14. Reinforcement plate; 15. Filter hole. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0033] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0034] Example 1
[0035] like Figure 1 As shown, an embodiment of the present invention is a prefabricated T-beam structure combining reactive powder concrete and ordinary concrete, including an H-shaped steel 2;
[0036] The H-shaped steel 2 is placed horizontally in an I-shape, and a wire mesh 4 is installed at a horizontal height of 1 / 2 of the H-shaped steel 2; the bottom casting material of the wire mesh 4 is ordinary concrete 5, and the top casting material is reactive powder concrete 3; internal stirrups 1 and angle bars 6 are laid on the outside of the H-shaped steel 2, and multiple groups of angle bars 6 are provided. The internal stirrups 1 are surrounded by the angle bars 6 in a rectangular distribution, and the internal stirrups 1 are connected to the wire mesh 4, and the H-shaped steel 2 is located inside the internal stirrups 1.
[0037] The utility model is a prefabricated T-beam structure combining steel-type reactive powder concrete and ordinary concrete. The specific implementation method is as follows:
[0038] Step 1: Tie the H-shaped steel, stirrups, and angle bars according to the steel bar arrangement, and place the wire mesh at 1 / 2 of the beam height;
[0039] Step 2: Complete the formwork of the tied steel bars;
[0040] Step 3: Pour ordinary concrete to 1 / 2 of the beam height and vibrate thoroughly;
[0041] Step 4: continuously pouring reactive powder concrete to the top of the beam;
[0042] Step 5: After pouring is completed, timely cover with film to keep it moist. After the specified curing time is reached, remove the mold and peel off the film to obtain the prefabricated part;
[0043] Notes:
[0044] 1) When using a vibrating rod, the concrete should not touch the steel skeleton and H-shaped steel during vibration;
[0045] 2) Reactive powder concrete should be poured continuously after ordinary concrete pouring is completed, and the lower layer of concrete must not begin to set before pouring is completed;
[0046] 3) The rough surfaces on both sides of the T-beam should be roughened;
[0047] The utility model has a large structural bearing capacity, high rigidity and good seismic performance, which can meet the design requirements of large-span and large-bay structural designs, reduce the number of load-bearing wall columns in the design, enhance the aesthetics of the architectural design, and also simplify the construction process, which can shorten the construction period to a certain extent and reduce the maintenance cost during subsequent use. Active powder concrete is used in the upper half of the T-beam and ordinary concrete is used in the lower half. While saving construction costs, its advantages of high compressive performance and durability are fully utilized. Ordinary concrete mainly includes cement, aggregate (fine aggregate and coarse aggregate), water and added admixtures. External additives are admixtures such as water reducers, air entraining agents, retarders, etc. added according to the needs of concrete performance. The main components of active powder concrete include fine quartz sand, cement, ground quartz powder, silica fume, fine steel fiber and high-efficiency water reducer. The specific materials are improved according to the actual construction needs. The material composition and proportion are not elaborated in detail here. You can refer to the existing material composition.
[0048] Example 2
[0049] like Figures 2 to 5 As shown, it is another implementation scheme of the present invention. On the basis of Example 1, since the wire mesh 4 is distributed on both sides of the H-shaped steel, the side away from the H-shaped steel is the template during pouring. Therefore, it will float up as ordinary concrete is poured, so it is necessary to keep the wire mesh 4 horizontal. Construction eyes and connectors are opened on the wire mesh 4. The construction eyes are used for inserting a vibrating rod to achieve the effect of vibrating concrete to achieve a manufacturing effect. The wire mesh 4 is fixedly connected to the H-shaped steel 2; the connector is located at the upper end of the connection between the wire mesh 4 and the internal stirrup 1, and the bottom of the connector is suitable for connecting the wire mesh 4.
[0050] like Figure 3 As shown, the connector includes an inner cylinder 7, which is fixed to the internal stirrup 1. An outer cylinder 8 is mounted on the outside of the inner cylinder 7. A connecting hook 9 is mounted at the bottom of the outer cylinder 8. The bottom of the connecting hook 9 hooks the mesh of the wire mesh 4. The connecting hook 9 has an external thread, and an abutment sleeve is mounted on the thread. When the connecting hook is mounted on the wire mesh, the abutment sleeve is rotated to abut against the wire mesh. The outer diameter of the abutment sleeve is set according to the actual mesh diameter.
[0051] like Figure 4 As described above, an external thread is provided on the outside of the inner cylinder 7, and the external thread of the inner cylinder 7 is connected to the outer cylinder 8; a large diameter portion 10 is provided at the bottom of the outer cylinder 8, and a connecting bearing 11 is installed in the large diameter portion 10. The outer ring of the connecting bearing 11 is fixedly connected to the large diameter portion 10, and the inner ring of the connecting bearing 11 is fixedly installed with an annular boss 12, and the bottom of the annular boss 12 is fixedly connected to the top of the connecting hook 9. The annular boss 12 is as shown in FIG. Figure 5As shown, the cross section is an "I" shape, with concave edges on both sides used to connect the inner ring of the bearing. The connecting bearing connects the inner and outer rings through rolling elements to achieve a rotational effect. The connecting hooks 9 are provided in two sets and are both installed at an angle and arranged in an "eight" shape.
[0052] Example 3
[0053] like Figure 6 and 7 The figure shows another embodiment of the present invention. Based on Example 2, to strengthen the connection between the reactive powder concrete and ordinary concrete, short posts 13 are installed on the upper and lower sides of the steel mesh 4. These short posts 13 are adapted to connect to the reactive powder concrete 3 and ordinary concrete 5, respectively. A reinforcing plate 14 is provided in the middle of the H-shaped steel 2. Two sets of reinforcing plates 14 are provided, located on the upper and lower sides of the steel mesh 4. These reinforcing plates 14 are welded to the steel mesh 4 and have multiple sets of filter holes 15 formed in them.
[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.
[0055] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A prefabricated T-beam structure combining reactive powder concrete and ordinary concrete, characterized by: including H-beam (2); The H-shaped steel (2) is placed horizontally in an I-shape, and a steel mesh (4) is installed at a level 1 / 2 of the H-shaped steel (2); the bottom of the steel mesh (4) is cast with ordinary concrete (5), and the top is cast with active powder concrete (3); Internal stirrups (1) and angle bars (6) are laid on the outside of the H-shaped steel (2), multiple groups of angle bars (6) are provided, the internal stirrups (1) surround the angle bars (6) and are distributed in a rectangular shape, the internal stirrups (1) are connected to the steel mesh (4), and the H-shaped steel (2) is located inside the internal stirrups (1).
2. The prefabricated T-beam structure of reactive powder concrete combined with ordinary concrete according to claim 1, characterized in that: A construction eye and a connecting piece are provided on the wire mesh (4), and the wire mesh (4) is fixedly connected to the H-shaped steel (2); the connecting piece is located at the upper end of the connection between the wire mesh (4) and the internal stirrup (1), and the bottom of the connecting piece is suitable for connecting the wire mesh (4).
3. The prefabricated T-beam structure of reactive powder concrete combined with ordinary concrete according to claim 2, characterized in that: The connecting member comprises an inner cylinder (7), the inner cylinder (7) being fixed on the internal stirrup (1), an outer cylinder (8) being installed on the outer side of the inner cylinder (7), a connecting hook (9) being installed at the bottom of the outer cylinder (8), and the bottom of the connecting hook (9) being hooked on the mesh of the wire mesh (4).
4. The prefabricated T-beam structure of reactive powder concrete combined with ordinary concrete according to claim 2, characterized in that: An external thread is provided on the outside of the inner cylinder (7), and the external thread of the inner cylinder (7) is connected to the outer cylinder (8); a large diameter portion (10) is provided at the bottom of the outer cylinder (8), and a connecting bearing (11) is installed in the large diameter portion (10), the outer ring of the connecting bearing (11) is fixedly connected to the large diameter portion (10), and an annular boss (12) is fixedly installed on the inner ring of the connecting bearing (11), and the bottom of the annular boss (12) is fixedly connected to the top of the connecting hook (9).
5. The prefabricated T-beam structure of reactive powder concrete combined with ordinary concrete according to claim 4, characterized in that: The connecting hooks (9) are provided in two groups and are both installed at an angle and distributed in an "eight" shape.
6. The prefabricated T-beam structure combining reactive powder concrete and ordinary concrete according to claim 4, characterized in that: Insertion short posts (13) are installed on both the upper and lower sides of the steel mesh (4), and the insertion short posts (13) are suitable for being connected to the reactive powder concrete (3) and the ordinary concrete (5) respectively.
7. The prefabricated T-beam structure of reactive powder concrete combined with ordinary concrete according to claim 4, characterized in that: A reinforcing plate (14) is provided in the middle of the H-shaped steel (2), and two groups of reinforcing plates (14) are provided and located on the upper and lower sides of the steel mesh (4); the reinforcing plates (14) are welded to the steel mesh (4), and a plurality of groups of filter holes (15) are provided on the reinforcing plates (14).