CN211080588U - Shear nail-concrete interface buffer device - Google Patents

Abstract

The utility model discloses a shear nail-concrete interface buffer device, which comprises a plurality of parallel round reinforcing ribs arranged in an X-Y plane; the outer circumferential surface of each circular reinforcing rib is fixedly connected with a plurality of longitudinal ribs which are arranged in parallel along the Z direction; the inner diameter of the innermost circular reinforcing rib is matched with the outer diameter of the shear nail body. The utility model discloses can effectively restrain the crushing of interface and cut the destruction, improve structural reliability to scientifically prevent and reduce the emergence of the integrated configuration destruction that arouses because of the interface destruction, improve steel-concrete integrated configuration's reliability.

Description

Shear nail-concrete interface buffer device

Technical Field

The utility model relates to a combination beam structure construction field, especially a shear force nail-concrete interface buffer.

Background

As concrete strength increases, the brittleness problem associated therewith becomes more pronounced.

The ultra-high performance concrete can be an engineering material with the best durability, the mechanical property of the appropriately reinforced ultra-high performance concrete is close to that of a rigid structure, and meanwhile, the ultra-high performance concrete has excellent wear resistance and anti-explosion performance. Therefore, the ultra-high performance concrete is particularly suitable for large-span bridges, anti-explosion structures (military engineering, bank vaults and the like) and thin-wall structures, and is used in high-abrasion and high-corrosion environments. At present, the ultra-high performance concrete is applied to some practical projects, such as a large-span pedestrian bridge, a highway and railway bridge, a thin-wall silo, a nuclear waste tank, a steel cable anchoring reinforcing plate, an ATM protective shell and the like. However, the application of ultra-high strength concrete has just started. The reason for this is that the ultra-high strength concrete has large brittleness and poor ductility, which greatly limits its application in engineering. Meanwhile, a composite structure, such as a composite structure bridge, is an important direction for future bridge development.

At present, the treatment methods for solving the problems of low tensile strength, large brittleness and poor ductility of ultra-high performance concrete, which easily generate a pressure concentration phenomenon and generate a local instability phenomenon, at home and abroad are mainly to improve the concrete material performance by methods of improving the concrete aggregate type and gradation, the water-cement sand ratio, cementing material components and the like, or to optimize the mechanical property of a connecting piece and add the connecting piece by changing the material type and the structure size of a connecting piece shear nail, performing structure topology optimization design and the like. However, the existing method still has the problems that due to the fact that UHPC is high in strength, a rigid connecting piece must be configured to bear tensile stress (the rigidity and the strength of a flexible connecting piece are not enough), the UHPC is large in brittleness, the rigid connecting piece enables the pressure concentration phenomenon to be more obvious, interface crushing or shearing damage is more likely to occur, and the UHPC is difficult to apply.

The shearing force nail-concrete connection interface is divided into shearing force nail shearing and sliding, concrete crushing and shearing damage. The former is less, and the latter is a common failure mode, so that the research of the shear pin-concrete interface buffer device has important practical engineering significance.

Disclosure of Invention

The utility model aims to solve the technical problem that, it is not enough to prior art, provide a shear force nail-concrete interface buffer, thereby prevent or slow down shear force nail-concrete interface and cause higher stress concentration to take place the crushing or cut the destruction to effectively restrain main super high performance concrete crushing or cut the destruction, improve structural stability.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a shear nail-concrete interface buffer device comprises a plurality of round reinforcing ribs which are arranged in parallel in an X-Y plane; the outer circumferential surface of each circular reinforcing rib is fixedly connected with a plurality of longitudinal ribs which are arranged in parallel along the Z direction; the inner diameter of the innermost circular reinforcing rib is matched with the outer diameter of the shear nail body.

The circle centers of the plurality of circular reinforcing ribs are the same, and the circle centers of the circular reinforcing ribs are the same, so that the circular reinforcing ribs can generate uniformly distributed stress when bearing pressure in the radius direction.

The adjacent circular reinforcing ribs are connected through reinforcing transverse ribs. The adjacent circular reinforcing ribs are connected through the reinforcing transverse ribs, so that the connecting surface can bear higher pressure without crushing damage.

And the extension line of the connecting line of the reinforcing transverse ribs in the two adjacent circular rings passes through the circle center.

N layers of circular reinforcing ribs arranged along the Z direction are arranged in the X-Y plane; the N layers of circular reinforcing ribs divide the longitudinal ribs into N-1 sections; wherein N is more than or equal to 2. The three ribs of the structure are reasonably distributed, and the function can be exerted to the maximum extent.

The length of each section of longitudinal rib is equal. The structure is symmetrical.

Each circular reinforcing rib is fixedly connected with L longitudinal ribs, all the longitudinal ribs are fixedly connected with the corresponding reinforcing transverse ribs, all the longitudinal ribs connected with the reinforcing transverse ribs on the same straight line are in the same plane and are parallel to each other to form a space structure, and the longitudinal ribs bear shear stress to enable the structure not to generate sliding damage and shearing damage.

The L longitudinal ribs connected with the same circular reinforcing rib are equally spaced, so that the structure is symmetrical.

The distance between L longitudinal bars connected with the same circular reinforcing bar is 0.39 times of the radius of the circular reinforcing bar, and the reasonable distance between the longitudinal bars ensures that the structure can bear the influence of the maximum eccentric force under the condition of concrete pouring.

The number of the circular reinforcing ribs is 3, and the intervals between every two adjacent circular reinforcing ribs are equal. Making the structure symmetrical.

Compared with the prior art, the utility model discloses the beneficial effect who has does: the utility model forms a net structure by the combination and arrangement of three kinds of ribs, so that the structure can bear larger shearing stress than the traditional shearing force connecting piece; through the whole that buffer and concrete formed for connecting interface concrete and shear force connecting piece elastic modulus difference reduce, have reduced the probability that the connection interface takes place crushing and shear failure, do not change connecting piece intensity and rigidity requirement simultaneously, have improved the structure reliability.

Drawings

Fig. 1 is a front view of an embodiment of the present invention.

Fig. 2 is a top view of an embodiment of the present invention.

Fig. 3 is a left side view of an embodiment of the present invention.

Detailed Description

As shown in fig. 1-3, the external buffering device 2 of the present invention is a cylindrical grid structure, the reinforcing longitudinal rib 3 is arranged along the Z direction in the cylindrical grid structure, and the circular reinforcing rib 4 and the reinforcing transverse rib 5 are arranged in the X-Y plane along the radial direction of the X-Y cylindrical surface.

And each layer of the reinforcing longitudinal ribs in the Z direction and the X-Y plane circular reinforcing ribs form a concentric cylinder grid structure with different diameters of the bottom surface to form a main body of the buffer device.

And the reinforcing longitudinal ribs along the Z direction are arranged in M layers according to a periodic rule, and the structure is divided into M-1 periods, wherein M is more than 2.

N layers of circular reinforcing ribs and the circular reinforcing ribs reinforce the transverse ribs along the radial direction of the radius in the X-Y plane, and the cylindrical grid structure is divided into N-1 periods with equal length, wherein N is more than 3.

The inner circular reinforcing ribs and the reinforcing transverse ribs are connected in the X-Y plane, so that a net-shaped structure is formed.

Each layer of circular reinforcing transverse ribs in the X-Y plane are mutually parallel and regularly distributed along the period, and each layer of reinforcing transverse ribs in the diameter direction are mutually parallel and regularly distributed along the period.

In the Z direction, two adjacent longitudinal bar distances in the same period are reduced in sequence and are respectively 0.39 times of the radius of the circular reinforcing bar in the corresponding period, a structure with the wide outside and the narrow inside is formed, concrete is poured into the buffer device conveniently in actual construction, and the two longitudinal bar distances in the radial ray direction in different periods are half of the thickness of the external buffer device.

In the X-Y plane, the circular reinforcing ribs and the reinforcing transverse ribs arranged along the radial direction of the radius of the circular reinforcing ribs enclose 32 small curved surfaces, the area of each curved surface is gradually reduced along the direction of the radius pointing to the circle center, and the minimum area of each curved surface is not less than 7.3mm²。

The nominal diameter of the shear pin bottom surface circle is 10, 13, 16, 19, 22 and 25mm, and the thickness of each layer corresponding to the external buffer device is as follows: 10. 13, 16, 19, 22 and 25mm, and the total length of the corresponding structures is 40-180 mm, 40-200 mm, 50-250 mm, 60-300 mm, 80-300 mm and 80-300 mm in sequence.

M =2 when the radius <16, and M =3 or M =4 when the radius > 16.

When shear pin length <100, N =3, 100< shear pin length <200, 3< N <6, shear pin length >200mm, N = 6.

The utility model discloses in, outside buffer 2 establishes outside cylinder form shear force nail main part 1. In this embodiment, M =3 and N = 6.

The total length of 16 longitudinal ribs is 1 period along the Z direction, the total length of 48 longitudinal ribs is 3 periods, and the structure is divided into 16 equal parts.

In the X-Y plane, there are 3 circular ribs with gradually reduced radius and 16 reinforcing transverse ribs distributed along the equal division points in one period, and there are 15 circular ribs and 80 reinforcing transverse ribs in 5 periods. The round ribs and the reinforcing transverse ribs are connected to form a net structure.

Concrete is poured into the buffer device to form a reinforced concrete buffer layer, the problem of interface stress concentration can be effectively relieved in the X-Y plane direction (two dimensions) through the buffer medium, the crushing and shearing damage of the connecting interface can be effectively inhibited, and the structural reliability is improved, so that the occurrence of the structural damage of the combined structure caused by the damage of the connecting interface can be scientifically prevented and reduced, and the reliability of the reinforced concrete combined structure is improved.

Claims (10)

1. A shear nail-concrete interface buffer device is characterized by comprising a plurality of round reinforcing ribs (4) which are arranged in parallel in an X-Y plane; the outer circumferential surface of each circular reinforcing rib (4) is fixedly connected with a plurality of longitudinal ribs (3) which are arranged in parallel along the Z direction; the inner diameter of the innermost circular reinforcing rib (4) is matched with the outer diameter of the shear nail body (1).

2. A shear pin-concrete interface buffer according to claim 1, wherein the circular reinforcing bars (4) are concentric.

3. A shear pin-concrete interface buffer according to claim 2, wherein adjacent circular reinforcing bars (4) are connected by a reinforcing cross bar (5).

4. A shear pin-concrete interface buffer according to claim 3, wherein the extension line of the connecting line of the reinforcing transverse bars (5) in two adjacent circular rings passes through the circle center.

5. The shear pin-concrete interface buffer of claim 1, wherein N layers of circular reinforcing ribs (4) arranged along the Z direction are arranged in the X-Y plane; the N layers of circular reinforcing ribs (4) divide the longitudinal ribs (3) into N-1 sections; wherein N is more than or equal to 2.

6. A shear pin-concrete interface buffer according to claim 5, wherein each section of the longitudinal bars (3) is of equal length.

7. A shear pin-concrete interface buffer device according to any one of claims 3-6, wherein each circular reinforcing rib (4) is fixedly connected with L longitudinal ribs (3), all the longitudinal ribs (3) are fixedly connected with the corresponding reinforcing transverse ribs (5), and all the longitudinal ribs (3) connected with the reinforcing transverse ribs (5) on the same straight line are in the same plane and parallel to each other.

8. A shear pin-concrete interface buffer according to claim 7, wherein the L longitudinal bars (3) connected to the same circular reinforcing bar (4) are equally spaced.

9. A shear pin-concrete interface buffer according to claim 7, wherein the distance between L longitudinal bars (3) connected to the same circular reinforcing bar (4) is 0.39 times the radius of the circular reinforcing bar (4).

10. A shear pin-concrete interface buffer according to any one of claims 1 to 6, wherein the number of the circular reinforcing ribs is 3, and the interval between two adjacent circular reinforcing ribs is equal.

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