CN101525911B - A Casing Energy Dissipating Element with Shear Keys - Google Patents

Abstract

The invention discloses a sleeve dissipative element with a shear key. The dissipative element consists of an inner tube and an outer tube which are coaxially lapped; the shear key is arranged on internal tube wall of a lapped segment of the outer tube; a cavity is formed between the inner tube and the outer tube, and an expanding cement mantle is formed in the cavity. Friction force of contact surfaces between the expanding cement mantle and the tube is increased by chemical prestress of expanding cement grout; and snap-in force between the expanding cement mantle and the shear key can improve joint strength between the outer tube and the grout mantle and control a fracture surface on the contact surface between external wall of the inner tube and the grout mantle. The dissipative element can be taken as a common support to bear axial load in a normal service status, and the dissipative element consumes and absorbs seismic energy by relative slip of the inner tube and the outer tube under the action of seismic load. The dissipative element has the advantages of low requirement for machining accuracy, steel saving and low cost. Only the grouting sleeve dissipative element needs to be replaced if the grouting sleeve dissipative element is damaged and disabled in a seismic hazard, which is very convenient.

Description

A casing energy-dissipating element with a shear key

technical field

The invention relates to a support component for fixing buildings, in particular to an energy dissipation element of the support component, which is used to reduce damage to buildings and structures caused by earthquake load effects. the

Background technique

With the increasing construction of many and high-rise buildings, earthquake resistance has become the main research object of structural design. The traditional anti-seismic design method takes "anti-seismic" as the main idea. Due to its economical and safety problems, it is gradually replaced by structural control technology. Structure control technology includes active structure control technology and passive structure control technology. Energy-dissipating bracing technology is one of the more common passive control technologies, and it is a very practical way to improve the seismic performance of structures in the seismic fortification of new buildings and the seismic reinforcement of existing buildings. the

Ordinary energy-dissipating braces are non-load-bearing components in building structures. A system composed of energy-dissipating braces can be installed between columns or between seismic walls. The method is to install various energy-dissipating nodes or damping devices with different functions on ordinary supports. The device generally does not function under normal loads and small earthquakes. When encountering a strong earthquake, when the main load-bearing members of the structure have not yet yielded, the energy-dissipating support device starts to slip or rotate to increase the damping or consume the energy input by the earthquake into the structure with friction work, so that the structure changes. Dynamic characteristics, to achieve the purpose of protecting the main structure and play the role of shock absorption. At present, a variety of energy-dissipating braces have been developed, which can be classified into the following three categories: frictional energy-dissipating braces, viscous and viscoelastic dampers, and buckling-resistant metal energy-dissipating braces. the

Frictional energy-dissipating shock-absorbing brace consumes and absorbs seismic energy through the sliding of the brace; the viscoelastic damper in the viscous and viscoelastic damper energy-dissipating shock-absorbing brace is formed by alternate lamination of viscoelastic material and constrained steel plate, is A shock absorber primarily related to speed. It increases the damping of the structure through the shear hysteretic deformation of the viscoelastic material, dissipates the input seismic energy, thereby reducing the vibration response of the structure; Energy consumption and shock absorption. The existing energy-dissipating support adopts the method of installing various energy-dissipating elements and damping devices with different functions on the ordinary support or using large-ductile metal materials, which has the advantages of high cost, inconvenient maintenance and replacement after the earthquake, high processing accuracy requirements, Disadvantages such as complicated installation limit the wide application of energy-dissipating supports.

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a supporting energy-consuming element that is easy to maintain and replace, simple in processing, simple in construction, superior in performance, and low in cost. It can absorb the technical problems of shock absorption and seismic reinforcement of existing buildings. At the same time, it is also a load-bearing member of the building structure in the non-earthquake state. the

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A bushing energy-dissipating element with a shear key, which includes an inner tube and an outer tube, the inner tube and the outer tube are coaxially overlapped, and the inner wall of the overlapping section of the outer tube is provided with a shear key, so The gap between the outer pipe and the overlapping section of the inner pipe is provided with an expanded cement slurry, and the expanded cement slurry forms an expanded cement sheath after solidification. the

Based on the above main technical features, the shear key is a surfacing spot or a weld seam or a truncated steel bar or a stud welded on the inner wall surface of the overlapping section of the outer pipe. the

Based on the above main technical features, the outer end of the overlapping section of the outer tube and the inner tube is provided with an outer ring plate, and the inner end of the overlapping section of the outer tube and the inner tube is provided with an inner ring plate. The outer ring plate and the inner ring plate are fixedly connected with the outer pipe, the inner ring plate, the outer ring plate, the inner pipe and the outer pipe form a grouting cavity, and the outer wall of the grouting cavity is provided with A grouting hole, the expanded cement slurry is located in the grouting cavity. the

Based on the above main technical features, fibers are mixed in the expansive cement slurry. the

Based on the above main technical features, the fibers are steel fibers, carbon fibers or glass fibers. the

Based on the above main technical features, the expansive cement slurry is mixed with sand. the

The beneficial effect of the present invention is: the present invention utilizes the chemical prestress of expansion cement slurry, makes the contact surface of expansion cement sheath and steel pipe compact, to increase the frictional force between the two. The inner surface of the outer tube is welded with shear keys, and the joint strength of the expansion cement slurry and the shear keys is used to improve the connection strength between the outer tube and the grout ring, and the failure surface is controlled on the contact surface between the outer wall of the inner tube and the grout ring, and the reciprocating Under load, this type of failure is beneficial to the mechanical performance of the energy-dissipating element. Under normal use conditions, the invention can withstand large axial loads and have the same rigidity as ordinary supports; under earthquake loads, the invention consumes and absorbs seismic energy through the relative sliding of the inner and outer pipes. Its mechanism of action makes the components not have too high requirements on machining accuracy, saves steel materials, and has low cost. After the invention fails in an earthquake disaster, only the supporting energy-consuming elements need to be replaced. The use of this support requires no extra workload for structural designers, easy on-site installation, and no special technical requirements. the

The energy-dissipating support of the invention can replace the existing frictional energy-dissipating shock-absorbing support, viscous and viscoelastic damper energy-dissipating shock-absorbing support and anti-buckling metal energy-dissipating shock-absorbing support for use in structures, and has wide applications. Although the grouting casing connection has been used in the component connection of construction engineering, it only stays at the level of steel pipe connection. The application of anti-seismic reinforcement has not been recognized, and the invention solves the technical problems of energy dissipation and shock absorption of new buildings and the technical problems of anti-seismic reinforcement of existing buildings with a method with simple construction and low cost. the

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention. the

Fig. 2 is a schematic structural diagram of a ring plate in an embodiment of the present invention. the

Fig. 3 is a schematic diagram of a shear key in the form of surfacing welding points according to an embodiment of the present invention. the

Fig. 4 is a schematic diagram of a shear key in the form of a surfacing weld according to an embodiment of the present invention. the

Fig. 5 is a schematic diagram of a shear key in the form of a truncated steel bar according to an embodiment of the present invention. the

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. the

As shown in Figure 1, as an embodiment of the present invention, the energy dissipation element of the grouting casing includes an inner tube 1 and an outer tube 2, the inner tube 1 is inserted into the outer tube 2 along the tube axis and overlapped coaxially, and the inner tube 1 Both the surface of the outer wall and the inner wall of the outer pipe 2 can be sandblasted or shot blasted, and the inner pipe wall of the overlapping section of the outer pipe 2 is provided with a shear key 6, which is a solder joint, and the outer pipe 2 and the inner pipe 1 The outer end of the overlapping section is provided with an annular outer ring plate 4, and the inner end of the overlapping section of the outer pipe 2 and the inner pipe 1 is provided with an annular inner ring plate 5 (as shown in Figure 2), and the outer ring plate 4 and the inner ring plate 5 are fixedly connected with the outer pipe 2, the inner ring plate 5, the outer ring plate 4, the inner pipe 1 and the outer pipe 2 enclose a grouting cavity 3, and grouting holes are arranged on the wall of the grouting cavity 3, and the grouting cavity 3 Inject expansive cement through the grouting hole to form an expansive cement sheath. the

After the expansion cement slurry is poured into the grouting cavity 3, the volume of the expansion cement slurry expands to form a cement sheath after consolidation. Due to the constraints of the inner and outer sleeves on the cement sheath, radial prestress is generated between the cement sheath and the steel pipe, increasing the The friction between the cement sheath and the pipe body, when the inner and outer pipes undergo reciprocating relative displacement under the action of the earthquake force, the friction on the sliding surface will do work to consume the energy input by the earthquake to the structure, and play the role of energy dissipation and shock absorption. The surface is welded with shear keys, and the joint strength of the expansion cement slurry and the shear keys is used to improve the connection strength between the outer pipe and the cement slurry ring. the

After the outer ring plate 4 and the inner ring plate 5 are fixed at both ends of the cement slurry, the expanded cement slurry is restrained in three directions, which increases the prestress of the connecting section. The outer ring plate 4 and the inner ring plate 5 can be used simultaneously according to the actual situation, or only the inner ring plate 4 or the outer ring plate 5 can be used. Since the ring plate restricts the relative displacement between the expansion cement slurry and the outer pipe in the connecting section, the failure surface will appear on the contact surface between the outer wall of the inner pipe and the expansion cement slurry, and the failure surface will be controlled to the contact between the outer wall of the inner pipe and the cement slurry ring On the surface, under the action of reciprocating load, this form of failure is conducive to the stress of the energy dissipation element. the

The shear parts take the form of surfacing welds 10 (as shown in FIG. 3 ), the form of surfacing welds 11 (as shown in FIG. 4 ), or the form of truncated steel bars 12 (as shown in FIG. 5 ). The processing accuracy is not high, and there is no direction requirement for setting the shear parts, and they can be arranged randomly. the

For the convenience of grouting, grouting holes can also be opened anywhere on the wall of the grouting cavity, and the number can be one or more. The grouting holes 7 shown in Fig. 2 are opened on the ring plate. the

Due to the high compressive strength of the expanded cement slurry, but it is prone to cracking under tension, fibers can be added to the expanded cement slurry, and the addition of the fiber has greatly improved the mechanical properties of the expanded cement slurry and improved the performance of this invention. Bearing capacity and hysteretic energy dissipation performance. The fibers added to the expansive cement slurry include carbon fiber and steel fiber, etc. The type and amount of fiber should be selected according to the actual situation of the project. In order to reduce the shrinkage of the cement slurry after liquefaction, sand can also be mixed in the expansion cement slurry. the

The energy dissipation and shock absorption performance of the present invention is mainly determined by the element size and the expansion rate of the expansion cement slurry, and the selection of the expansion agent and the mixing ratio of the expansion cement slurry largely affect the performance of the invention. The present invention relies on the frictional force and bonding force between the steel pipe and the expansion cement slurry to transmit the axial force under the normal service load. Under the action of a large earthquake, the seismic energy is consumed by the sliding friction between the steel pipe and the expansion cement slurry. the

The production process of the present invention: determine the specific size of the inner and outer steel pipes and the length of the steel pipe socket section according to the element bearing capacity level of the present invention, and determine the corresponding size of the ring plate according to the size of the steel pipe, and design the ring plate to avoid possible problems during assembly as much as possible . If fiber needs to be mixed in, the type of fiber mixed in and the ratio of fiber expansion cement slurry should be determined according to the needs. The outer ring plate can be processed into a whole ring or two half rings, and grouting holes can be added on the end ring plate. Process the inner and outer ring plates (temporary templates can be used if the inner or outer ring plates are not used), complete the connection between the inner and outer ring plates and the outer pipe, weld the shear keys evenly on the inner surface of the outer pipe, and place the foam The plastic snaps into the outer tube to the position of the inner ring plate to define the length of the grout section. Position the inner and outer tubes accurately to ensure that the axes of the two tubes coincide. The fiber expansion cement slurry is mixed according to the proportion, and the mixing method is adjusted according to the fiber type. Quickly pour the fiber-expanded cement slurry that has been mixed into the grouting cavity through the grouting hole, and vibrate it by knocking after grouting to help the air in the fiber-expanded cement slurry to discharge and ensure the density of the expanded cement slurry. Then cover the connecting section with plastic film for maintenance. the

The casing energy-dissipating element with shear key provided by the embodiment of the present invention has been introduced in detail above. For those of ordinary skill in the art, based on the idea of the embodiment of the present invention, both the specific implementation method and the scope of application There will be changes (such as the type of fiber in the fiber-expanded cement slurry, etc.). To sum up, the contents of this specification should not be construed as limiting the present invention, and any changes made according to the design concept of the present invention are within the scope of protection of the present invention. the

Claims (11)

1. A bushing energy dissipation element with a shear key, characterized in that it comprises an inner tube (1) and an outer tube (2), and the inner tube (1) and the outer tube (2) are coaxially overlapped , the inner wall of the overlapping section of the outer pipe (2) is provided with a shear key (6), and the gap between the outer pipe (2) and the overlapping section of the inner pipe (1) is provided with expansive cement slurry, and the expanded cement slurry forms an expanded cement sheath after solidification. 2. A casing energy-dissipating element with a shear key according to claim 1, characterized in that: the shear key (6) is welded on the inner wall surface of the overlapping section of the outer pipe (2) Overlay welding spot (10) or welding seam (11) or truncated steel bar (12) or stud. 3. A bushing energy-dissipating element with a shear key according to claim 1 or 2, characterized in that: the outer end of the overlapping section of the outer tube (2) and the inner tube (1) is set There is an outer ring plate (4), and an inner ring plate (5) is provided at the inner end of the overlapping section between the outer pipe (2) and the inner pipe (1), and the outer ring plate (4) and the inner ring plate (4) The ring plate (5) is fixedly connected with the outer pipe (2), and the inner ring plate (5), the outer ring plate (4), the inner pipe (1) and the outer pipe (2) form a grouting cavity A cavity (3), grouting holes are arranged on the outer wall of the grouting cavity (3), and the expansion cement slurry is located in the grouting cavity (3). 4. A bushing energy dissipation element with a shear key according to claim 3, characterized in that: the grouting hole is located on the inner ring plate (5) or on the outer ring plate (4) Or on the section of the grouting cavity (3) of the outer pipe (2) or on the section of the grouting cavity (3) of the inner pipe (1). 5. A casing energy-dissipating element with a shear key according to claim 1, 2 or 4, characterized in that fibers are mixed in the expansion cement slurry. 6. A bushing energy-dissipating element with shear keys according to claim 5, characterized in that: said fibers are steel fibers, carbon fibers or glass fibers. 7. The casing energy-dissipating element with shear keys according to claim 3, characterized in that fibers are mixed in the expansion cement slurry. the 8. A bushing energy-dissipating element with shear keys according to claim 7, wherein the fibers are steel fibers, carbon fibers or glass fibers. 9. A casing energy-dissipating element with shear keys according to any one of claims 1 or 2 or 4 or 6 to 8, characterized in that sand is mixed in the expansion cement slurry. 10. A casing energy-dissipating element with a shear key according to claim 3, characterized in that sand is mixed in the expansion cement slurry. 11. A casing energy-dissipating element with a shear key according to claim 5, characterized in that sand is mixed in the expansion cement slurry. the

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