An energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure

Abstract

The present invention provides an energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure, belonging to the technical field of seismic isolation and vibration reduction. It includes: an inverted siphon water delivery pipe; the inverted siphon water delivery pipe is composed of a plurality of pipe segments connected in sequence; the pipe segments are connected through an aluminum foam shock absorption unit; one end of the inverted siphon water delivery pipe is connected to the water intake of the upstream river through a first regulating valve, and the other end is connected to a reservoir through a second regulating valve; a reinforced concrete anchor block is arranged at the corner of the inverted siphon water delivery pipe. The seismic isolation and vibration reduction structure provided by the present invention can effectively improve the overall stiffness and stability of the inverted siphon structure, and achieve the purpose of comprehensively enhancing the overall impact resistance, seismic performance of the inverted siphon structure and compensating for the deformation of the inverted siphon. The structure is simple, easy to install and maintain, and can be widely applied to the construction, repair and protection of long-distance water conveyance projects in alpine and canyon areas.

Description

Technical Field

[0001] The present invention belongs to the technical field of seismic isolation and energy dissipation, and particularly relates to an energy-absorbing thin-walled inverted siphon seismic isolation structure. Background Technique

[0002] In many areas, the location selection of some inverted siphon structures cannot avoid being near fault zones. Earthquake disasters often occur frequently and the seismic intensity is high in these areas, bringing new challenges to the construction and operation of long-distance water conveyance structures. Once the inverted siphon structure is subjected to extreme earthquake action, it may cause irreparable damage to the structure, resulting in huge losses of life and property. Therefore, carrying out research on inverted siphon seismic isolation structures has important research significance and can significantly reduce the damage caused by earthquakes to water conveyance structures. In recent years, the use of new energy-absorbing materials (such as aluminum foam, foam concrete filled with negative Poisson's ratio sandwich structures, etc.) in the seismic field has become more and more common. However, how to maximize the energy absorption efficiency of energy-absorbing materials remains a debatable issue. For this reason, the development of energy-absorbing seismic isolation structures has become an important research direction for the seismic performance of long-distance water conveyance structures. In addition, although expansion joints are often provided in the middle of the pipe section of the inverted siphon structure to solve the deformation compensation required by the pipeline under extreme working conditions such as installation or extreme loads, the flexibility of the inverted siphon structure is improved to a certain extent. It should be noted that the inverted siphon has a large diameter and a long pipe body. After being subjected to potential earthquake loads, the expansion joints between its pipe sections are prone to deflection and stress concentration, becoming the starting point of pipe body damage, seriously reducing the overall seismic performance of the inverted siphon structure and unable to ensure the normal operation of the inverted siphon.

[0003] The invention patent with the application number of "201810616487.4" provides a multi-channel and different-size inverted siphon structure applicable to long distances, which is characterized in that at least two inverted siphon channels are arranged in parallel, which can ensure that there is enough submerged depth at the inlet of the inverted siphon under different operating flow rates, so that the water flow at the inlet of the inverted siphon is stable and no air enters the inverted siphon pipe. Although the above components can effectively ensure the stable operation of the inverted siphon structure when combined with each other, there are still some deficiencies: the water pressure burden on the common inlet and outlet of multiple inverted siphon channels is relatively large. In addition, shock absorption and displacement compensation devices are not arranged on the pipe section and the pipe body, and these limitations are not conducive to seismic resistance and are not easy to be widely applied on a large scale.

[0004] The invention patent with the application number of "201410371033.7" provides an adaptive deformation inverted siphon structure, which includes a flexible water delivery pipe laid along the bottom section of the river, a deformation compensator arranged on the water delivery pipe, a pipe extension section, inlet and outlet control valves, etc. Although this invention patent can connect the truncated irrigation canal and ensure that it will not be damaged during subsequent continuous deformation, and is applicable to the area across the river ditch affected by the subsidence basin. However, there are still some disadvantages: the polyethylene water delivery pipe has low stiffness, and stress concentration may occur at the connection parts with the corrugated deformation compensator or the sliding deformation compensator, and the seismic performance cannot be guaranteed. On the other hand, the polyethylene water delivery pipe is not conducive to anti-freezing. The water body inside the water delivery pipe is extremely easy to freeze in winter, and it is only applicable to the area across the river ditch affected by the subsidence basin, with complex construction technology and the construction efficiency cannot be guaranteed.

[0005] The above inverted siphon structure realizes the purpose of improving the structural availability from aspects such as changing the functional form, and has not developed a new type of inverted siphon seismic protection structure from the perspective of seismic safety. Therefore, in order to improve the ability of the inverted siphon to resist potential seismic loads and reduce the losses caused by the action of seismic loads, it is urgent to invent a new type of seismic isolation and vibration reduction structure with simple structure, obvious seismic isolation and vibration reduction effect and anti-freezing, which not only effectively improves the overall stiffness and stability of the inverted siphon structure, but also comprehensively enhances the overall anti-impact and seismic performance of the inverted siphon structure and compensates for the deformation of the inverted siphon. Summary of the Invention

[0006] The purpose of the present invention is to provide an energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure to solve the above problems.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] An energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure includes: an inverted siphon water delivery pipe; the inverted siphon water delivery pipe is composed of a plurality of pipe segments connected in sequence; the pipe segments forming the inverted siphon water delivery pipe are connected through an aluminum foam shock absorption unit; one end of the inverted siphon water delivery pipe is connected to the water intake of the upstream river through a first regulating valve, and the other end is connected to a reservoir through a second regulating valve; a reinforced concrete anchor block is arranged at the corner of the inverted siphon water delivery pipe.

[0009] Further, a foam concrete layer filled with a negative Poisson's ratio sandwich structure is arranged on the outer side of the inverted siphon water delivery pipe; the foam concrete layer filled with the negative Poisson's ratio sandwich structure is bonded to the outer side of the inverted siphon water delivery pipe through a high-strength structural adhesive BD811; a stainless steel protective layer is arranged on the outer side of the foam concrete layer filled with the negative Poisson's ratio sandwich structure.

[0010] Further, the thickness of the foam concrete layer filled with the negative Poisson's ratio sandwich structure is 20 - 40 cm.

[0011] Furthermore, the negative Poisson's ratio sandwich structure filling foam concrete layer is filled with C15 concrete.

[0012] Furthermore, the thickness of the aluminum foam shock absorption unit is 10 - 30 cm.

[0013] Furthermore, the aluminum foam shock absorption unit consists of a spring unit layer, an aluminum foam layer, and a stainless steel protective layer; both ends of the spring unit layer are sequentially connected to the left and right pipe sections; the aluminum foam layer is attached to the outside of the spring unit layer; the stainless steel protective layer is installed on the outer surface of the aluminum foam layer.

[0014] Furthermore, both ends of the spring unit layer are sequentially connected to the left and right pipe sections by welding or bolts; the aluminum foam layer is pasted to the outside of the spring unit layer by resin glue or ABS plastic adhesive H - 1505; the stainless steel protective layer is installed on the outer surface of the aluminum foam layer by bolts.

[0015] Furthermore, the length of the spring unit layer is 30 - 50 cm.

[0016] Furthermore, the thickness of the stainless steel protective layer is 1 - 3 cm, and the length is 30 - 50 cm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The spring unit layer can compensate for a part of the increase in the length of the inverted siphon water conveyance pipe caused by the poor deformation of the foundation in different directions, meet the deformation requirements of the inverted siphon water conveyance pipe, and effectively ensure that the inverted siphon water conveyance pipe is no longer damaged during continuous deformation under extreme loads such as earthquakes, thereby solving the seismic safety problem of long - distance water conveyance buildings in earthquake - prone areas of high mountains and deep valleys.

[0019] (2) By setting the aluminum foam shock absorption layer, the aluminum foam shock absorption layer can absorb the huge seismic energy brought by different pipe sections caused by seismic loads, and at the same time can relieve the excessive deformation of the spring unit, thereby improving the shock absorption stability of the entire inverted siphon water conveyance pipeline.

[0020] (3) The sandwich structure has the characteristics of light weight, high specific strength, good heat insulation and frost resistance performance, and high energy absorption efficiency. By arranging the negative Poisson's ratio sandwich structure filling foam concrete layer outside the inverted siphon pipe, it can effectively reduce the influence of the impact force on the structural damage under extreme working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic overall layout diagram of an energy - absorbing thin - walled inverted siphon seismic isolation and vibration reduction structure provided by the present invention;

[0022] Figure 2 FIG. is a cross - sectional view of an energy - absorbing thin - walled inverted siphon seismic isolation and vibration reduction structure provided by the present invention;

[0023] Figure 3 This invention provides an axial sectional view of an energy - absorbing thin - walled inverted siphon seismic isolation structure;

[0024] Figure 4 This invention provides a cross - sectional view of the inverted siphon water conveyance pipe of an energy - absorbing thin - walled inverted siphon seismic isolation structure.

[0025] Wherein: 1 - upstream river channel, 2 - reservoir, 3, 4, 5, 6 reinforced concrete anchor blocks, 71, 72, 73 - aluminum foam shock - absorbing units, 8 - inverted siphon water conveyance pipe, 9 - first regulating valve, 10 - second regulating valve, 11 - aluminum foam layer, 12 - spring unit layer, 13 - stainless steel protective layer, 14 - foam concrete layer filled with negative Poisson's ratio sandwich structure. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0028] In the description of the invention, it should be noted that unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium. However, the connections at various places do not affect the multi - position folding of this application. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] As Figure 1A specific embodiment of an energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure shown in the figure includes: an inverted siphon water conveyance pipe 8 laid along the alpine canyon area; the inverted siphon water conveyance pipe 8 is composed of a plurality of pipe segments connected in sequence; the pipe segments forming the inverted siphon water conveyance pipe are connected by foam aluminum shock absorption units 71, 72, 73; one end of the inverted siphon water conveyance pipe 8 is connected to the water intake of the upstream river 1 through a first regulating valve 9, and the other end is connected to a reservoir 2 through a second regulating valve 10; reinforced concrete anchor blocks 3, 4, 5, 6 are arranged at the corners of the inverted siphon water conveyance pipe 8.

[0030] Specifically, the first regulating valve 9 and the second regulating valve 10 can control the flow rate in the inverted siphon water conveyance pipe 8.

[0031] Specifically, the reinforced concrete anchor blocks 3, 4, 5, 6 arranged at the corners of the inverted siphon water conveyance pipe 8 can provide a certain protection effect and anti-deformation effect for the inverted siphon water conveyance pipe 8.

[0032] Specifically, the foam aluminum shock absorption units 71, 72, 73 arranged in the middle of each pipe segment of the inverted siphon water conveyance pipe 8 can reduce the energy of seismic waves acting on the inverted siphon structure, and effectively reduce the damage of external impact force to the inverted siphon structure under extreme working conditions.

[0033] In other preferred embodiments, as Figure 4 shown, a foam concrete layer 14 filled with a negative Poisson's ratio sandwich structure is arranged on the outer side of the inverted siphon water conveyance pipe 8; the foam concrete layer 14 filled with the negative Poisson's ratio sandwich structure is bonded to the outer side of the inverted siphon water conveyance pipe 8 through a high-strength structural adhesive BD811; a stainless steel protective layer 13 is arranged on the outer side of the foam concrete layer 14 filled with the negative Poisson's ratio sandwich structure; the thickness of the foam concrete layer 14 filled with the negative Poisson's ratio sandwich structure is 20 - 40 cm, and C15 concrete is filled in the foam concrete layer 14 filled with the negative Poisson's ratio sandwich structure.

[0034] Specifically, the foam concrete layer 14 filled with the negative Poisson's ratio sandwich structure is bonded to the outer side of the inverted siphon water conveyance pipe 8 through a high-strength structural adhesive BD811. The BD811 structural adhesive has the advantages of uniform stress distribution on the bonding surface, no thermal influence and deformation on parts, no shrinkage after curing, high bonding strength, good toughness, excellent corrosion resistance, aging resistance, high temperature resistance and other properties, effectively avoiding the radial movement of the foam concrete layer 14 filled with the negative Poisson's ratio sandwich structure.

[0035] Specifically, the foam concrete layer 14 filled in the negative Poisson's ratio sandwich structure combines the advantages of negative Poisson's ratio materials and foam concrete to reduce the impact of impact force on the structure damage under extreme working conditions. The main reason is that it has good energy absorption capacity. Filling foam concrete in the negative Poisson's ratio honeycomb will improve the deformation ability of the foam concrete and increase its compressive bearing capacity, preventing it from suddenly brittle failure. And the foam concrete can provide vertical support for the negative Poisson's ratio honeycomb, improving the bearing capacity of the honeycomb structure. Through the synergistic effect of the two materials, the overall mechanical properties of the specimen can be improved.

[0036] In other preferred embodiments, such as Figure 2 and Figure 3 shown, the thickness of the foam aluminum shock absorption units 71, 72, and 73 is 10 - 30 cm. The foam aluminum shock absorption units 71, 72, and 73 are composed of a spring unit layer 12, a foam aluminum layer 11, and a stainless steel protective layer 13. The two ends of the spring unit layer 12 are sequentially connected to the pipe segments of the inverted siphon water conveyance pipes 8 on the left and right sides. The foam aluminum layer 11 is attached to the outer side of the spring unit layer 12. The stainless steel protective layer 13 is installed on the outer surface of the foam aluminum layer 11. The two ends of the spring unit layer 12 are sequentially connected to the pipe segments of the inverted siphon water conveyance pipes 8 on the left and right sides by welding or bolts. The foam aluminum layer 11 is pasted on the outer side of the spring unit layer 12 through resin glue or ABS plastic adhesive H-1505. The stainless steel protective layer 13 is installed on the outer surface of the foam aluminum layer 11 by bolts.

[0037] Specifically, the spring unit layer 12 can act as a deformation compensator function, which can automatically adapt to the irregular terrain in alpine and canyon areas. The inverted siphon water conveyance pipe 8 can also automatically adjust its vertical settlement, inclination, and horizontal swing deformation under extreme loads such as earthquakes, so as to adapt to various poor foundation deformations in alpine and canyon areas. The spring unit layer 12 can compensate for a part of the increase in the length of the inverted siphon water conveyance pipe 8 caused by poor foundation deformation along different directions. When the accumulated deformation of the inverted siphon water conveyance pipe 8 increases to the maximum deformation amount of the spring unit layer 12, a pipe segment is connected at any pipe segment position, and at the same time, the spring unit layer 12 is reset. When the inverted siphon water conveyance pipe 8 deforms again, it can be lengthened in a cyclic manner, so as to meet the deformation requirements of the inverted siphon water conveyance pipe 8, effectively ensuring that the inverted siphon water conveyance pipe 8 is not damaged during continuous deformation under extreme loads such as earthquakes, thus solving the seismic safety problem of long-distance water conveyance buildings in earthquake-prone alpine and canyon areas.

[0038] In other partially preferred embodiments, a foam aluminum layer 11 is arranged outside the spring unit layer 12. The foam aluminum layer 11 can absorb the impact force brought by different pipe segments caused by seismic loads, and at the same time, can also relieve the excessive deformation of the spring unit layer 12.

[0039] Principle of the invention: When the inverted siphon structure is subjected to earthquake load, the earthquake wave will quickly reach the energy-absorbing thin-walled inverted siphon seismic isolation structure. Under the reciprocating motion of the earthquake, the inverted siphon structure will swing left and right. The spring unit layer 12 can compensate for part of the change in the length of the inverted siphon water pipe 8 caused by the external load in different directions, meet the deformation requirements of the inverted siphon water pipe 8, and effectively ensure that the inverted siphon water pipe 8 will no longer be damaged during continuous deformation under extreme loads such as earthquakes, thereby solving the seismic safety problem of long-distance water supply buildings in earthquake-prone areas in high mountains and valleys. The foamed aluminum layer 11 can absorb the huge seismic energy brought by different pipe sections caused by the earthquake load, and at the same time can alleviate the excessive deformation of the spring unit layer 12. The negative Poisson's ratio sandwich structure filled with the foamed concrete layer 14 uses its advantage of better energy absorption to further reduce the energy of the seismic wave acting on the inverted siphon structure, and can also effectively reduce the damage to the inverted siphon structure caused by external impact forces under extreme working conditions. In general, the seismic isolation system of the present invention can significantly improve the stability of the entire inverted siphon water pipeline, meet the needs of normal operation of the project, and has a simple structure and is easy to install and maintain, and can be widely used in the construction and repair of long-distance water supply projects in mountainous canyon areas.

[0040] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. An energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure, characterized in that, Including: An inverted siphon water conveyance pipe; the inverted siphon water conveyance pipe is composed of a plurality of pipe segments connected in sequence; the pipe segments forming the inverted siphon water conveyance pipe are connected by an aluminum foam shock absorption unit; one end of the inverted siphon water conveyance pipe is connected to the water intake of the upstream river through a first regulating valve, and the other end is connected to a reservoir through a second regulating valve; a reinforced concrete anchor block is arranged at the corner of the inverted siphon water conveyance pipe; The aluminum foam shock absorption unit is composed of a spring unit layer, an aluminum foam layer and a stainless steel protective layer; both ends of the spring unit layer are sequentially connected to the pipe segments on the left and right sides; the aluminum foam layer is attached to the outside of the spring unit layer; the stainless steel protective layer is installed on the outer surface of the aluminum foam layer.

2. The energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure according to claim 1, wherein An auxetic sandwich structure filled with foamed concrete layer is arranged outside the inverted siphon water conveyance pipe; a stainless steel protective layer is arranged outside the auxetic sandwich structure filled with foamed concrete layer.

3. The energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure according to claim 2, characterized in that The thickness of the auxetic sandwich structure filled with foamed concrete layer is 20 - 40 cm.

4. The energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure according to claim 2, characterized in that, C15 concrete is filled in the auxetic sandwich structure filled with foamed concrete layer.

5. The energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure according to claim 1, wherein The thickness of the aluminum foam shock absorption unit is 10 - 30 cm.

6. The energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure according to claim 5, wherein, Both ends of the spring unit layer are sequentially connected to the pipe segments on the left and right sides by welding or bolts; the aluminum foam layer is pasted on the outside of the spring unit layer through resin glue; the stainless steel protective layer is installed on the outer surface of the aluminum foam layer through bolts.

7. A thin-walled inverted siphon energy-absorbing seismic isolation structure according to claim 1, characterized in that, The length of the spring unit layer is 30 - 50 cm.

8. The energy-absorbing thin-walled inverted siphon seismic isolation and vibration reduction structure according to claim 1 or 2, characterized in that, The thickness of the stainless steel protective layer is 1 - 3 cm, and the length is 30 - 50 cm.

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