A bidirectional tension and compression limiting device for structural joints of a navigation aqueduct and its usage method

Abstract

The present invention discloses a tension and compression bidirectional limiting device for structural joints of a navigable aqueduct, which relates to the technical application fields of civil engineering and earthquake engineering. It includes two groups of steel plates, each group of steel plates including a mounting backplate and a plurality of triangular steel plates; the tips of the triangular steel plates of the two groups of steel plates are cross-stacked; a chute is provided in the middle of each triangular steel plate; a fixed cylinder is arranged on one side of the chute close to the mounting backplate, and a sliding cylinder is arranged in the overlapping area of the chutes of the two groups of triangular steel plates. The present invention is a steel structure, which can provide sufficient stiffness and the limiting ability to accurately control displacement; under strong earthquake action, when used in combination with a liquid viscous damper, it can accurately limit the relative displacement between the troughs while reducing vibration and consuming energy, and replace the water stop at the structural joint to bear the tensile force and collision force caused by excessive relative displacement, thereby protecting the water stop from being damaged. The present invention also relates to a method for using this tension and compression bidirectional limiting device for structural joints of a navigable aqueduct.

Description

Technical Field

[0001] The present invention relates to the technical application fields of civil engineering and earthquake engineering, and more specifically, it is a tension and compression bi-directional limit device for the structural joints of a navigation aqueduct. The present invention also relates to a method for using such a tension and compression bi-directional limit device for the structural joints of a navigation aqueduct. Background Art

[0002] In recent years, China has made great progress in the construction of large dams. In order to meet the growing navigation demand, ship lifts and navigation aqueducts have been built as rapid channels for crossing dams; due to the functional requirements of the structure, from the ship lift towards the trough platform, the pier heights of the navigation aqueduct continuously change from high to low; the ship lift structure has a large stiffness, and the adjacent navigation aqueduct spans are high pier structures. The fundamental periods of the two are quite different, and the high piers have a large displacement deformation capacity. They are structures that are prone to severe collisions under longitudinal earthquakes; the collision effects of the navigation aqueduct during earthquakes have the following characteristics:

[0003] 1) Due to the needs of structural functions, there are huge differences in the periods between the ship lift and the adjacent navigation aqueduct spans, forming a severe collision area. The collisions in this area have an obvious transmission effect; moreover, in other trough spans where the period differences are not obvious, there are still significant collision areas, and the main controlling factor is the high piers with large displacements.

[0004] 2) Collisions amplify the peak values of the pier top displacements and pier bottom bending moments in the significantly affected collision areas by about 2 times; the influence on the pier bottom shear force is greater than that on the bending moment, and the most affected is the bearing shear force; the most significant collision area is the 2 - 3 spans near the ship lift, where the bearing shear force in the structural joint water stop area can be amplified by up to 9 times. In other significantly affected collision areas, the bearing shear force is also amplified by 2 - 3 times.

[0005] The above content can be found in the literature "Nie Liying, Lin Haoran, Li Shousheng, Shuai Jiaojiao, Wang Jiwei. Research on the Collision Characteristics of Navigation Aqueducts under Longitudinal Earthquake Action [J]. Earthquake Engineering and Engineering Vibration, 2020, 40(02): 73 - 82."

[0006] As a rapid channel for crossing dams, the navigation aqueduct and the ship lift are required to prevent water leakage at the structural joints under earthquake action to avoid endangering the ships, staff, or passengers in the trough, and there is also a need for emergency evacuation after the earthquake; therefore, the seismic design under strong earthquakes should be centered around energy dissipation and seismic reduction design, and at the same time, strictly limit the relative displacement at the structural joints to reduce or avoid the impact of collisions on the navigation aqueduct and protect the water stop from being threatened.

[0007] On the one hand, the mass of the navigation aqueduct trough body is much greater than that of the bridge structure with the same span, and energy dissipation devices with strong energy dissipation capabilities are required; the viscous fluid damper is a device that simply provides damping and has no initial stiffness, and will not affect the structural state under static force. In particular, compared with other energy dissipation and displacement limiting devices, it can provide a large damping ratio and energy dissipation capacity, adapting to the characteristics of the large mass of the navigation aqueduct trough body. On the other hand, the energy dissipation and displacement limiting and shock absorption effects of this energy dissipation device are related to the frequency contained in the seismic wave in addition to the structural characteristics and the parameters of the device itself, and the seismic wave is highly random. Therefore, if it is necessary to ensure that the water stop at the structural joint is not damaged by tension or collision damage, a displacement limiting device with two-way tension and compression control is required, so that the collision force after the damper reduces shock or the tension exceeding the allowable tensile deformation of the water stop is borne by this displacement limiting device with two-way tension and compression control, thereby forming a protective effect on the water stop at the structural joint. Summary of the Invention

[0008] The first object of the present invention is to overcome the deficiencies of the above-mentioned background technology and provide a two-way tension and compression displacement limiting device for the structural joint of a navigation aqueduct.

[0009] The second object of the present invention is to provide a usage method for this two-way tension and compression displacement limiting device for the structural joint of a navigation aqueduct.

[0010] To achieve the above first object, the technical solution of the present invention is: a two-way tension and compression displacement limiting device for the structural joint of a navigation aqueduct, characterized in that: it includes two groups of steel plates, each group of the steel plates includes a mounting back plate and a plurality of triangular steel plates connected to the mounting back plate; the plurality of triangular steel plates are arranged in parallel at intervals; the tips of the triangular steel plates of the two groups of steel plates are cross-stacked; a chute is opened in the middle of each triangular steel plate;

[0011] A fixed cylinder is arranged on one side of the chute close to the mounting back plate, and a sliding cylinder is arranged in the overlapping area of the chutes of the two groups of triangular steel plates.

[0012] In the above technical solution, both ends of the chute are semi-circular.

[0013] In the above technical solution, the tip of the triangular steel plate is in a groove shape.

[0014] In the above technical solution, the distance between the plurality of triangular steel plates in each group of the steel plates is greater than the thickness of the triangular steel plate.

[0015] In the above technical solution, the side surface of the fixed cylinder is fixedly connected to the mounting back plate through bolts.

[0016] In the above technical solution, the sliding cylinder includes a sliding cylinder main body, a sliding cylinder top cap located at the top of the sliding cylinder main body, and a sliding cylinder bottom plate located at the bottom of the sliding cylinder main body. The sliding cylinder top cap and the sliding cylinder bottom plate clamp the sliding cylinder main body within the overlapping area of the sliding grooves of the two sets of triangular steel plates.

[0017] To achieve the above second object, the technical solution of the present invention is: a method for using a bidirectional tension and compression limiting device for structural joints of a navigation aqueduct, characterized in that the bidirectional tension and compression limiting device for structural joints of a navigation aqueduct is installed on both sides of adjacent trough ends of the navigation aqueduct and is used in cooperation with a liquid viscous damper; it includes the following steps:

[0018] Step 1: Under the action of a strong earthquake, when the adjacent trough bodies move towards each other, the two sets of steel plates move closer to each other synchronously; when the relative displacement of the adjacent trough bodies is less than the allowable compression amount of the structural joint water stop, the tips of the two sets of sliding grooves do not contact the fixed cylinders on the left and right sides. At this time, the liquid viscous damper is in a working state, and the bidirectional tension and compression limiting device for structural joints of the navigation aqueduct is not stressed.

[0019] Step 2: When the relative displacement of the adjacent trough bodies is greater than the allowable compression amount of the structural joint water stop, the tips of the two sets of sliding grooves both contact the fixed cylinders on both sides. At this time, the bidirectional tension and compression limiting device for structural joints of the navigation aqueduct collides and is stressed, restricting the further displacement of the structure, thereby preventing the water stop from being damaged due to collision.

[0020] Step 3: Under the action of a strong earthquake, when the adjacent trough bodies move in the opposite direction, the two sets of steel plates move away from each other synchronously; when the relative displacement of the adjacent trough bodies is less than the allowable tensile amount of the structural joint water stop, the sliding grooves of the two sets of steel plates contact the middle sliding cylinder. At this time, the liquid viscous damper is in a working state, and the bidirectional tension and compression limiting device for structural joints of the navigation aqueduct is not stressed.

[0021] Step 4: When the relative displacement of the adjacent trough bodies is greater than the allowable tensile amount of the structural joint water stop, at this time, the sliding grooves of the two sets of steel plates contact the middle sliding cylinder. At this time, the bidirectional tension and compression limiting device for structural joints of the navigation aqueduct is stressed, restricting the further displacement of the structure, thereby preventing the water stop from being damaged due to tension.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1) The present invention is a steel structure, which can provide sufficient stiffness and the ability to accurately control displacement; under the action of a strong earthquake, when used in combination with a liquid viscous damper, it can accurately limit the relative displacement between trough bodies while reducing vibration and energy consumption, and replace the structural joint water stop to bear the tension and collision force caused by excessive relative displacement, thereby protecting the water stop from being damaged.

[0024] 2) The present invention does not affect the structural force and displacement under normal environmental actions such as temperature and normal navigation, that is, it will not have an impact on the structure in the static state.

[0025] 3) The structure of the present invention is simple, and the working state control method is clear, which is convenient for precise design in coordination with construction requirements (such as the allowable deformation of the water stop at the structural joint). At the same time, it is also convenient for production and is beneficial to the cost control of seismic design.

[0026] 4) The number of triangular steel plates of the present invention can be set according to engineering requirements, and the applicable range is relatively wide.

[0027] 5) The present invention is a steel structure with good durability; it is externally installed between adjacent grooves, which is convenient for installation, inspection, detection and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural view of the present invention.

[0029] Figure 2 is a front view of the present invention.

[0030] Figure 3 is a schematic structural view of the steel plate.

[0031] Figure 4 is a side view of the steel plate.

[0032] Figure 5 is a schematic structural view of the fixed cylinder.

[0033] Figure 6 is a front view of the fixed cylinder.

[0034] Figure 7 is a top view of the fixed cylinder.

[0035] Figure 8 is a schematic structural view of the sliding cylinder.

[0036] Figure 9 is a front view of the sliding cylinder.

[0037] Figure 10 is a top view of the sliding cylinder.

[0038] Figure 11 is a schematic structural view of the fluid viscous damper.

[0039] Figure 12 is an arrangement drawing of the present invention and the fluid viscous damper.

[0040] Figure 13 is an elevation view of the navigation aqueduct and the ship lift.

[0041] Figure 14 is an arrangement position drawing of the present invention and the fluid viscous damper.

[0042] Figure 15 is a plan dimension drawing of the present invention.

[0043] Figure 16 This is the dimension design drawing of the present invention.

[0044] Figure 17 This is the curve graph of the bearing capacity experiment of 40t external load and the displacement-load of the finite element of the present invention.

[0045] Figure 18 This is the structural schematic diagram of the bearing capacity experiment device.

[0046] Among them, 1 - steel plate, 11 - installation back plate, 111 - back plate bolt hole, 12 - triangular steel plate, 121 - chute, 2 - fixed cylinder, 21 - fixed cylinder bolt hole, 3 - sliding cylinder, 31 - cylinder main body, 32 - sliding cylinder top cap, 33 - sliding cylinder bottom plate, 4 - liquid viscous damper, 5 - structural joint, 6 - bearing capacity experiment device, 61 - top plate, 62 - back plate, 63 - pressure sensor, 64 - hydraulic sensor, 65 - cushion block, 66 - displacement sensor. Specific implementation manners

[0047] The implementation situation of the present invention will be described in detail below in conjunction with the attached drawings. However, they do not constitute a limitation to the present invention and are only for illustration purposes. At the same time, the advantages of the present invention will be made clearer and easier to understand through the description.

[0048] Referring to the attached drawings, it can be seen that: a two-way tension and compression limit device for the structural joint of a navigation aqueduct, characterized in that: it includes two groups of steel plates 1, and each group of the steel plates 1 includes an installation back plate 11 and a plurality of triangular steel plates 12 connected to the installation back plate 11; the plurality of triangular steel plates 12 are arranged in parallel at intervals; the tips of the triangular steel plates 12 of the two groups of the steel plates 1 are cross-stacked; a chute 121 is opened in the middle of each triangular steel plate 12;

[0049] A fixed cylinder 2 is arranged on one side of the chute 121 close to the installation back plate 11, and a sliding cylinder 3 is arranged in the overlapping area of the chutes 121 of the two groups of triangular steel plates 12.

[0050] Both ends of the chute 121 are semi-circular.

[0051] The tip of the triangular steel plate 12 is in a groove shape.

[0052] The distance between the plurality of triangular steel plates 12 of each group of the steel plates 1 is greater than the thickness of the triangular steel plate 12.

[0053] The side surface of the fixed cylinder 2 is fixedly connected to the installation back plate 11 by bolts; a plurality of fixed cylinder bolt holes 21 are arranged on the side surface of the fixed cylinder 2, and the installation back plate 11 is provided with back plate bolt holes 111 matching the fixed cylinder bolt holes 21.

[0054] The sliding cylinder 3 includes a sliding cylinder main body 31, a sliding cylinder top cap 32 located at the top of the sliding cylinder main body 31, and a sliding cylinder bottom plate 33 located at the bottom of the sliding cylinder main body 31. The sliding cylinder top cap 32 and the sliding cylinder bottom plate 33 clamp the sliding cylinder main body 31 within the overlapping area of the sliding grooves 121 of the two sets of triangular steel plates 12.

[0055] A method for using a two-way tension and compression limiting device for structural joints of a navigation aqueduct, characterized in that the two-way tension and compression limiting device for structural joints of the navigation aqueduct is installed on both sides of adjacent ends of the navigation aqueduct and used in cooperation with the viscous fluid damper 4 to strictly limit the longitudinal relative displacement between adjacent aqueducts under strong earthquake action, avoid water leakage caused by damage to the water stop of the structural joint, and threaten the safety of ships, staff or passengers in the aqueduct; the method includes the following steps:

[0056] Step 1: Under strong earthquake action, when adjacent trough bodies move towards each other, the two sets of steel plates 1 move closer to each other synchronously; when the relative displacement between adjacent trough bodies is less than the allowable compression amount of the water stop of the structural joint, the tips of the two sets of sliding grooves 121 do not contact the fixed cylinders 2 on the left and right sides. At this time, the viscous fluid damper 4 is in a working state, and the two-way tension and compression limiting device for structural joints of the navigation aqueduct is not stressed.

[0057] Step 2: When the relative displacement between adjacent trough bodies is greater than the allowable compression amount of the water stop of the structural joint, the tips of the two sets of sliding grooves 121 both contact the fixed cylinders 2 on both sides. At this time, the two-way tension and compression limiting device for structural joints of the navigation aqueduct collides and is stressed, restricting the further displacement of the structure, thereby preventing the water stop from being damaged by extrusion due to collision.

[0058] Step 3: Under strong earthquake action, when adjacent trough bodies move in opposite directions, the two sets of steel plates 1 move away from each other synchronously; when the relative displacement between adjacent trough bodies is less than the allowable tensile amount of the water stop of the structural joint, the sliding grooves 121 of the two sets of steel plates 1 contact the middle sliding cylinder 3. At this time, the viscous fluid damper 4 is in a working state, and the two-way tension and compression limiting device for structural joints of the navigation aqueduct is not stressed.

[0059] Step 4: When the relative displacement between adjacent trough bodies is greater than the allowable tensile amount of the water stop of the structural joint, at this time, the sliding grooves 121 of the two sets of steel plates 1 contact the middle sliding cylinder 3. At this time, the two-way tension and compression limiting device for structural joints of the navigation aqueduct is stressed, restricting the further displacement of the structure, thereby preventing the water stop from being damaged by stretching.

[0060] In actual use, the present invention is installed on both sides of adjacent ends of the navigation aqueduct and between the end of the navigation aqueduct and the trough platform (ship lift), and is used in cooperation with the viscous fluid damper 4.

[0061] Under normal temperature, ship navigation and other environmental and load actions, the sliding grooves 121 meet the relative displacement requirements (the expansion and contraction amount of the water stop of the structural joint) between adjacent trough bodies, and the present invention does not affect the structural stress and deformation.

[0062] The bidirectional tension and compression limiting device for the structural joint of the navigable aqueduct is installed on both sides of the structural joint of the trough body or T beam, so as to Figure 13 take the structural joint at the top of Pier 8 of the navigable aqueduct as an example; in Figure 14 , the bidirectional tension and compression limiting devices for the structural joint of the navigable aqueduct are arranged at a and a', c and c', and the liquid viscous dampers 4 are arranged at b and b'.

[0063] Such as Figure 15 shown, the dimension of d 顶 is determined by the diameters of three pin shafts and the expansion and contraction amount of the structural joint water stop. The force-bearing characteristics of the bidirectional tension and compression limiting device for the structural joint of the navigable aqueduct are similar to those of the pin shaft structure in the bridge. The force that this device needs to bear is obtained from the seismic response analysis of the navigable aqueduct structure, which determines the number and detailed dimensions of the bidirectional tension and compression limiting device for the structural joint of the navigable aqueduct; the plate thickness of the single plate of the device, b, d 凹 , the diameter of the pin shaft and other design parameters need to be checked for compression resistance, splitting resistance, shear resistance, bending resistance, etc. of the pin shaft in the "Code for Design of Highway Steel Structure Bridges" (JTG D64-2015).

[0064] Designed with a structural joint water stop expansion and contraction amount of 4 cm, Q235 ordinary steel, and a device bearing capacity of 40 t, the design dimensions of the bidirectional tension and compression limiting device for the structural joint of the navigable aqueduct are as Figure 16 shown; it is tested through the bearing capacity test device 6 as shown in 18; the bearing capacity test device 6 includes a top plate 61 and a back plate 62, and both sides at the bottom of the top plate 61 are sequentially connected to both sides at the top of the back plate 62 through a pressure sensor 63, a hydraulic sensor 64, and a cushion block 65; the bidirectional tension and compression limiting device for the structural joint of the navigable aqueduct can be installed in the middle of the top plate 61 and the back plate 62, and a displacement sensor 66 is installed between the two groups of steel plates 1.

[0065] Comparing the finite element and experimental data, it can be seen that: for the external load-displacement curve, the experiment and the finite element analysis are generally in good agreement. Before the external load reaches 50 t, the external load and displacement are in a linear relationship and are in the fully elastic range; the experimental external load, that is, the design load of the present invention, is 40 t, which is safe and feasible.

[0066] The frame-type trough wall is 6 m high, and the T beam is 3.6 m high, with relatively ample space to arrange multiple bidirectional tension and compression limiting devices for the structural joint of the navigable aqueduct; if the overall bearing capacity requirement is high, high-strength steel can be used to improve the bearing capacity of a single device.

[0067] Other parts not described belong to the prior art.

Claims

1. Method for using a bidirectional tension and compression limiting device for structural joints of a navigable aqueduct, characterized in that: The bidirectional tension and compression limiting device for structural joints of the navigable aqueduct comprises two groups of steel plates (1), each group of the steel plates (1) comprising a mounting backplate (11) and a plurality of triangular steel plates (12) connected to the mounting backplate (11); the plurality of triangular steel plates (12) are arranged in parallel at intervals; the tips of the triangular steel plates (12) of the two groups of steel plates (1) are overlapped and stacked; a chute (121) is formed in the middle of each triangular steel plate (12); A fixed cylinder (2) is arranged on one side of the chute (121) close to the mounting backplate (11), and a sliding cylinder (3) is arranged in the overlapping area of the chutes (121) of the two groups of triangular steel plates (12); The sliding cylinder (3) comprises a sliding cylinder main body (31), a sliding cylinder top cap (32) located at the top of the sliding cylinder main body (31), and a sliding cylinder bottom plate (33) located at the bottom of the sliding cylinder main body (31). The sliding cylinder top cap (32) and the sliding cylinder bottom plate (33) clamp the sliding cylinder main body (31) in the overlapping area of the chutes (121) of the two groups of triangular steel plates (12); the bidirectional tension and compression limiting device for structural joints of the navigable aqueduct is installed on both sides of adjacent trough ends of the navigable aqueduct and used in cooperation with a fluid viscous damper (4); The said method for using comprises the following steps: Step 1: Under the action of a strong earthquake, when adjacent trough bodies move towards each other, the two groups of steel plates (1) approach each other synchronously; when the relative displacement of adjacent trough bodies is less than the allowable compression amount of the structural joint water stop, the tips of the two groups of chutes (121) do not contact the fixed cylinders (2) on the left and right sides. At this time, the fluid viscous damper (4) is in a working state, and the bidirectional tension and compression limiting device for structural joints of the navigable aqueduct is not stressed; Step 2: When the relative displacement of adjacent trough bodies is greater than the allowable compression amount of the structural joint water stop, the tips of the two groups of chutes (121) both contact the fixed cylinders (2) on both sides. At this time, the bidirectional tension and compression limiting device for structural joints of the navigable aqueduct collides and is stressed, restricting the further displacement of the structure, thereby preventing the water stop from being squeezed and damaged due to collision; Step 3: Under the action of a strong earthquake, when adjacent trough bodies move in opposite directions, the two groups of steel plates (1) move away from each other synchronously; when the relative displacement of adjacent trough bodies is less than the allowable tensile amount of the structural joint water stop, the chutes (121) of the two groups of steel plates (1) contact the middle sliding cylinder (3). At this time, the fluid viscous damper (4) is in a working state, and the bidirectional tension and compression limiting device for structural joints of the navigable aqueduct is not stressed; Step 4: When the relative displacement of adjacent trough bodies is greater than the allowable tensile amount of the structural joint water stop, at this time, the chutes (121) of the two groups of steel plates (1) contact the middle sliding cylinder (3). At this time, the bidirectional tension and compression limiting device for structural joints of the navigable aqueduct is stressed, restricting the further displacement of the structure, thereby preventing the water stop from being damaged due to tension.

2. The method for using a bidirectional tension and compression limiting device for structural joints of a navigable aqueduct according to claim 1, characterized in that: Both ends of the chute (121) are semi-circular.

3. The method for using a bidirectional tension and compression limiting device for structural joints of a navigable aqueduct according to claim 2, characterized in that: The tip of the triangular steel plate (12) is in a groove shape.

4. The usage method of a tensile and compressive bidirectional limiting device for the structural joint of a navigable aqueduct according to claim 3, characterized in that: The distance between multiple triangular steel plates (12) of each group of the steel plates (1) is greater than the thickness of the triangular steel plates (12).

5. The usage method of a tensile and compressive bidirectional limiting device for the structural joint of a navigable aqueduct according to claim 4, characterized in that: The side surface of the fixed cylinder (2) is fixedly connected to the mounting back plate (11) by bolts.

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