CN210919118U - Let and press energy-absorbing device suitable for let and press stock - Google Patents
Let and press energy-absorbing device suitable for let and press stock Download PDFInfo
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- CN210919118U CN210919118U CN201921910113.XU CN201921910113U CN210919118U CN 210919118 U CN210919118 U CN 210919118U CN 201921910113 U CN201921910113 U CN 201921910113U CN 210919118 U CN210919118 U CN 210919118U
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Abstract
The utility model relates to a let and press energy-absorbing device suitable for let and press stock, include: the anchor rod comprises an inner anchor section rod body, a yielding energy absorption device, an outer anchor section rod body, a connecting bolt and a limiting supporting plate. The yielding energy absorption device is connected with the inner anchor section rod body and the outer anchor section rod body through connecting bolts respectively. The yielding energy absorption device consists of a cavity shell and a force transmission shaft, wherein a piston at one end of the force transmission shaft is positioned inside the cavity shell, and the cavity shell is filled with hydraulic oil and is provided with a pressure limiting valve. When the anchor rod bears the axial load effect, cause the inside hydraulic oil of piston compression cavity casing, press the valve pressure release when the oil pressure reaches the upper limit value, the piston slides in the cavity casing, the anchor rod lets the pressure at the energy-absorbing device position of letting the pressure. Based on the utility model discloses a structural feature, the utility model discloses can adjust anytime and anywhere and let and press the load, let and press position and the biggest this three stock design parameter that lets of volume of stepping down, possess and satisfy different tunnels and let and press the characteristics that the stock was strutted the designing requirement.
Description
Technical Field
The utility model relates to a large deformation is stock supporting construction for tunnel or tunnel especially relates to a yielding energy-absorbing device suitable for yielding the stock.
Background
In deep-buried roadways and tunnels, weak surrounding rocks often undergo aging and large deformation after excavation. The traditional rigid supporting system (common anchor rod and steel arch) has the problems that the proportion of the supporting system for bearing the released load of the excavation of the surrounding rock is too large at the early stage of deformation of the weak surrounding rock, the self-bearing capacity of the rock mass is not fully exerted, and the load of the supporting structure exceeds the limit and is failed in yield because the rigidity of the whole supporting structure is too large. Therefore, for deep-buried roadways and tunnels which are easy to deform greatly, the traditional rigid supporting system is not applicable any more, and a corresponding flexible supporting system is adopted. The supporting structure has small rigidity, can bear part of surrounding rock excavation release load but is not over-limited by the load in the deformation process of the surrounding rock, and plays the roles of providing reliable supporting resistance for rock mass and fully exerting the self-bearing capacity of the surrounding rock.
The existing common anchor rod has low elongation rate and is not suitable for the condition of large deformation of surrounding rock; the existing yielding anchor rod has fixed yielding load, yielding amount and yielding position during processing and forming, and cannot be freely adjusted on the construction site.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a yielding energy-absorbing device suitable for yielding the stock to solve ordinary stock percentage of elongation low, current yielding stock yield load and yield the problem that the position can not freely be regulated and control at any time.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a let and press energy-absorbing device suitable for let and press stock, includes the interior anchor section body of rod, the outer anchor section body of rod, spacing layer board, its characterized in that: the energy-absorbing device is connected with the inner anchor section rod body and the outer anchor section rod body; let and press energy-absorbing device and constitute by dowel steel and cavity casing, the dowel steel comprises dowel steel and end fixed connection's piston, the piston is located cavity casing intracavity, will cavity casing inner chamber separates for compression chamber and backward flow chamber, the compression chamber is full of hydraulic oil, the conch wall of cavity casing is inside to be provided with the connection the overflow passageway in compression chamber and backward flow chamber overflow passageway and compression chamber junction set up the pressure-limiting valve.
Furthermore, the force transmission shaft is connected with the inner anchor section rod body through a connecting bolt, and the cavity shell is connected with the outer anchor section rod body through a connecting bolt.
Furthermore, a stop valve mounting hole for mounting the stop valve is formed in the cavity shell.
Furthermore, a force transmission shaft penetrating hole for the force transmission rod to penetrate out from the inside of the cavity shell is formed in the cavity shell; an outlet hole sealing ring is arranged on the outlet hole of the force transmission shaft, so that hydraulic oil is prevented from overflowing.
Furthermore, a pressure limiting valve mounting hole for mounting a pressure limiting valve is formed in the cavity shell, and the pressure limiting valve is connected with the pressure limiting valve mounting hole through threads.
Further, the pressure limiting valve comprises a prestress adjusting bolt, a spring and a marble; and two ends of the spring are respectively connected with the prestress adjusting bolt and the marble.
Furthermore, the diameter of the marble is larger than the diameter of a connecting port of the pressure limiting valve mounting hole and the compression cavity.
Furthermore, a piston sealing ring is arranged at the contact position of the piston and the inner cavity wall of the cavity shell, and the piston sealing ring can obstruct the compression cavity and the backflow cavity from exchanging hydraulic oil at the piston position.
The utility model discloses well stock can take place big deformation at the country rock, and stock body of rod load increases to the preset let when pressing the load step down and presses the inside constant force that produces of energy-absorbing device and slides, and stock body of rod part stress strain keeps invariable, and the stock wholly keeps the constant force extension to can adjust the load of stepping down through the threshold value of adjusting the voltage limiting valve at any time, step down and press the position of energy-absorbing device on the stock body of rod and adjust the length of the interior anchor section body of rod and the outer anchor section body of rod according to actual need at any time, consequently the utility model discloses not only can control the country rock and warp, still have fine supporting role under the big deformation condition of country rock, in order to guarantee the stability in tunnel.
The utility model discloses still possess following advantage: the pressure-yielding load can be adjusted by adjusting the threshold value of the pressure-limiting valve at any time and any place, the pressure-yielding position of the anchor rod can be adjusted by adjusting the lengths of the inner anchor section rod body and the outer anchor section rod body at any time and any place, the maximum pressure-yielding amount of the anchor rod can be freely increased by serially connecting different numbers of pressure-yielding energy-absorbing devices, and the maximum pressure-yielding amount can be adjusted by adjusting the axial size of a compression cavity of a cavity shell when the pressure-yielding energy-absorbing devices are designed, so that the pressure-yielding energy-absorbing. The utility model discloses each component simple manufacture, the device equipment is convenient, compares very little to drilling aperture size influence with ordinary prestressed anchorage pole.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes and the like of the respective members in the drawings are only schematic for helping the understanding of the present invention, and are not particularly limited to the shapes, the proportional sizes and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation. In the drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic composition diagram of the yielding energy-absorbing device in fig. 1.
Fig. 3 is a schematic view of the hollow housing and the force transmission shaft in fig. 2.
Fig. 4 is a structural schematic diagram of the pressure limiting valve in fig. 2.
Fig. 5 is a schematic view of the yielding process of the present invention.
Fig. 6 is a schematic view of the opened state of the pressure limiting valve in fig. 4, and the direction of the arrow is the flow direction of the hydraulic oil.
FIG. 7 is a schematic diagram of pressure limiting valve let-down load adjustment.
FIG. 8 is a schematic diagram illustrating adjustment of the maximum amount of increased yield of the compression cavity of the cavity housing.
FIG. 9 is a schematic diagram of a series process for increasing maximum capacity.
FIG. 10 is a schematic view of an adjusted yield position.
In the figure: 1-inner anchor section rod body, 2-yielding energy-absorbing device, 3-outer anchor section rod body, 4-connecting bolt, 5-limiting supporting plate, 6-limiting bolt, 21-cavity shell, 22-force transmission shaft, 23-pressure limiting valve, 24-stop valve, 25-hydraulic oil, 2101-shell wall, 2102-force transmission shaft through hole, 2103-through hole sealing ring, 2104-stop valve mounting hole, 2105-pressure limiting valve mounting hole, 2106-overflow inlet, 2107-overflow channel, 2108-overflow outlet, 2109-rod body connecting base, 2110-compression cavity, 2111-reflux cavity, 2201-force transmission rod, 2202-piston, 2203-piston sealing ring, 2301-prestress adjusting bolt, 2302-spring and 2303-positioning supporting plate, 2304-pallet hole, 2305-marble, 21051-ball seat, 21052-first cavity, 21053-second cavity.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the embodiment of the utility model provides a yielding energy-absorbing device suitable for yielding the stock, it can include: the anchor rod comprises an inner anchor section rod body 1, a yielding energy absorption device 2, an outer anchor section rod body 3, a connecting bolt 4, a limiting supporting plate 5 and a limiting bolt 6.
As shown in FIG. 2, the yielding energy absorption device 2 is composed of a cavity shell 21, a force transmission shaft 22, a pressure limiting valve 23, a stop valve 24 and hydraulic oil 25.
As shown in fig. 3, the cavity housing 21 is composed of a housing wall 2101, a force transmission shaft through hole 2102, a through hole sealing ring 2103, a stop valve mounting hole 2104, a pressure limiting valve mounting hole 2105, an overflow inlet 2106, an overflow channel 2107, an overflow outlet 2108, a rod body connecting base 2109, a compression chamber 2110, and a return chamber 2111.
The force transmission shaft 22 is composed of a force transmission rod 2201, a piston 2202 and a piston sealing ring 2203.
As shown in fig. 4, the pressure-limiting valve 23 is composed of a prestressed adjusting bolt 2301, a spring 2302, a positioning plate 2303, a plate hole 2304 and a marble 2305.
As shown in fig. 3, an external thread is provided at one end of the inner anchor section rod body 1, an external thread is provided at the end of the dowel 2201 and the rod body connection base 2109 of the yielding energy absorbing device 2, an external thread is provided at two ends of the outer anchor section rod body 3, and an internal thread is provided inside the connection bolt 4.
The inner anchor section rod body 1 is connected with a dowel steel 2201 in the yielding energy-absorbing device 2 through a connecting bolt 4, and the outer anchor section rod body 3 is connected with a rod body connecting base 2109 in the yielding energy-absorbing device 2 through a connecting bolt 4.
An overflow inlet 2106 is arranged at the upper left corner of the compression cavity 2110, an overflow channel 2107 is arranged in the wall of the shell wall 2101, an overflow outlet 2108 is arranged at the upper right corner of the backflow cavity 2111, and the overflow inlet 2106 and the overflow channel 2107 are respectively communicated with a pressure limiting valve mounting hole 2105 and respectively used as an inlet and a pressure relief opening of the pressure limiting valve 23. The stop valve 24 is fixedly mounted in the stop valve mounting hole 2104, and the pressure limiting valve 23 is mounted in the pressure limiting valve mounting hole 2105.
The piston 2202 is fixedly connected with the force transmission rod 2201, the piston 2202 is arranged in the cavity shell 21 and divides the interior of the cavity shell 21 into a compression cavity 2110 and a return cavity 2111, a piston sealing ring 2203 is arranged on the piston 2202 to prevent hydraulic oil 25 from leaking between the compression cavity 2110 and the return cavity 2111, and the shape of the piston 2202 is set to be T-shaped to avoid blocking an overflow outlet 2108 at the initial position.
The force transmission rod 2201 is passed out of the cavity housing 21 through the force transmission shaft through hole 2102, and the hydraulic oil 25 in the compression chamber 2110 is prevented from leaking by the arrangement of the through hole sealing ring 2103.
As shown in fig. 4, the prestress adjusting bolt 2301 is threaded on the outer surface thereof, and the pressure-limiting valve mounting hole 2105 is threaded on the inner wall thereof, which are mechanically coupled to each other, so that the initial compression load of the spring 2302 can be adjusted by turning the prestress adjusting bolt 2301.
The marble 2302 is fixedly connected with the positioning support plate 2303, so that spring load finally acts on the marble 2302 along the central axis of the pressure limiting valve installation hole 2015, and the marble 2302 only moves up and down along the central axis.
The locating plate 2303 divides the pressure limiting valve mounting hole 2105 into a first cavity 21052 and a second cavity 21053, and a supporting plate hole 2304 is arranged on the locating supporting plate 2303 and used for communicating the first cavity 21052 with the second cavity 21053.
A ball seat 21051 is provided in the pressure-limiting valve mounting hole 2105 and the overflow inlet 2106, and the ball seat 21051 and the marble 2305 can be tightly fitted. The ball seat 21051 design matched with the marble 2305 can increase the contact area of the marble 2305 and the ball seat 21051 when the overflow inlet 2106 is sealed, thereby improving the sealing effect.
The ball 2105 has two working positions, when the resultant force of the oil pressure in the compression chamber 2110 on the ball 2305 is less than the compression load of the spring 2302, the ball 2305 is stationary and in close contact with the ball seat 21051, and is in a first working position (shown in fig. 4), in which the ball 2305 blocks the overflow inlet 2106 from the first chamber 21052; when the resultant force of the oil pressure in chamber 2110 on ball 2305 is greater than the compression load of spring 2302, spring 2302 compresses and ball 2305 disengages from ball seat 21051 and spill inlet 2106 communicates with first chamber 21052 in the second operating position (shown in figure 6).
In order to prevent the protruding part of the dowel 2201 extending out of the cavity housing 21 from being exposed and rusted during yielding, the dowel 2201 needs to be painted and coated with anti-corrosion grease before assembly.
In order to increase the strength of the parts, the yielding energy absorption device 2 meets the strength requirement when being connected with anchor rod bodies with different diameters, and the cavity shell 21, the force transmission shaft 22 and the connecting bolt 4 are made of high-strength metal materials.
The stop valve 24 is opened, and the hydraulic oil is filled in the compression chamber 2110, and then the stop valve 24 is closed.
The utility model discloses a theory of operation is: when the anchor rod is subjected to axial tensile load, the force transmission shaft 22 and the cavity housing 21 have a tendency to generate relative displacement, and the axial tensile load is transmitted to the piston 2202 through the force transmission rod 2201 and the cavity housing 21, and the piston 2202 compresses the hydraulic oil 25 in the compression cavity 2110, so that the oil pressure in the compression cavity 2110 is increased.
As shown in fig. 5 and 6, when the oil pressure in the compression chamber 2110 exceeds the load applied to the ball 2305 by the spring 2302 of the pressure limiting valve 23, the ball 2305 moves from the first working position to the second working position, the overflow inlet 2106 is communicated with the first chamber 21052, and the hydraulic oil flows from the compression chamber 2110 to the return chamber 2111 through the overflow inlet 2106, the first chamber 21052, the pallet hole 2304, the second chamber 21053, the overflow channel 2107 and the overflow outlet 2108. As the hydraulic oil in the compression chamber 2110 overflows to the return chamber 2111, the amount of oil in the compression chamber 2110 decreases, the piston 2202 slides in the cavity housing 21, the compression energy absorption device 2 extends, and the anchor rod as a whole contracts.
When the oil pressure in the compression chamber 2110 is smaller than the load applied to the ball 2305 by the spring 2302 on the pressure limiting valve 23, the ball 2305 returns to the first working position (shown in fig. 4) from the second working position (shown in fig. 6), the overflow inlet 2106 is closed, the hydraulic oil 25 in the compression chamber 2110 does not flow out any more, at this time, the piston 2202 stops sliding in the cavity housing 21, the energy absorbing pressure device 2 stops extending, and the whole anchor rod stops yielding.
The initial load of the spring 2302 can be adjusted by adjusting the prestress adjusting bolt 2301 to change the threshold value of the pressure limiting valve 23 at any time and any place, and then the yielding load of the yielding anchor rod is changed. As shown in FIG. 7, the adjusting spring 2302 can be loosened or compressed based on the original deformation by turning the pre-stress adjusting bolt 2301, and then the internal force of the adjusting spring 2302 is reduced or increased, and the adjustment amount (deformation of the adjusting spring 2302) Δ l-internal force F of the pre-stress adjusting bolt 2301 is adjusted by the pre-stress adjusting bolt 23010The relationship satisfies the expression 1, and is determined by experiments. Acting on the anchor rod with a load F1When the pressure P in the compression chamber 2110 is equal to the pressure P in the compression chamber, the resultant force of the pressure P acting on the ball 2305 through the overflow port 2106 is F2，F2-F1The relationship satisfies equation 2 and is determined by experiment. When F is present2＝F0When the pressure yielding energy absorption device is in a critical pressure yielding state, F can be obtained by the deduction of the formula 1 and the formula 21The relation with Δ l is as shown in equation 3, that is, the relation between the yielding load of the yielding anchor rod and the adjustment amount Δ l of the prestress adjusting bolt 2301. When the required crush load is F1, the adjustment amount Δ l of the prestress adjusting bolt 2301 can be determined by equation 3.
F0＝f1(Delta l) formula 1
F2＝f2(F1) Formula 2
Δl＝f3(F1) Formula 3
Wherein: f. of1Shows the adjustment amount (deformation of the adjusting spring 2302) Delta l and the internal force F of the prestressed adjusting bolt 23010The functional relationship of (a) is determined through experiments; f. of2Indicating that a load F is acting on the anchor1Resultant force F of hydraulic oil 25 to spring 2302 upwards2The functional relationship of (a) is determined through experiments; f. of3Indicating that a load F is acting on the anchor1And the adjustment amount (the deformation of the adjusting spring 2302) delta l of the prestress adjusting bolt 2301.
The maximum amount of yielding of the yielding bolt can be regulated by increasing the axial length of the compression cavity 2110 of the cavity housing 21. As shown in fig. 8, by increasing the axial length of the compression cavity 2110, the maximum sliding distance of the piston 2202 inside the cavity housing 21 is increased, and then the maximum yielding amount of the yielding anchor rod is increased, which can be prefabricated according to engineering support design.
The maximum yielding amount of the yielding anchor rod can be increased by serially connecting a plurality of yielding energy absorption devices 2 on the yielding anchor rod at any time and any place. As shown in figure 9, n let and press energy-absorbing device 2 through establishing ties on an stock, let and press the holistic biggest volume of letting of stock and will increase to nl, can conveniently and swiftly cut the stock body of rod according to actual demand at the job site, the pressure-absorbing device 2 that lets of the corresponding quantity of series connection, assemble into the pressure stock that lets that satisfies the engineering demand.
The yielding position of the yielding anchor rod can be adjusted at any time and any place by adjusting the lengths of the inner anchor section rod body 1 and the outer anchor section rod body 3. As shown in fig. 10, the length of the inner anchor section rod body 1 and the length of the outer anchor section rod body 3 are adjusted to change the position of the yielding energy absorption device 2 on the yielding anchor rod, so that the yielding position of the yielding anchor rod is changed, the anchor rod body can be cut off according to actual requirements on a construction site, the yielding energy absorption device 2 is assembled, and the yielding anchor rods with different yielding positions are obtained.
The connecting bolt 4 has different specifications and is used for connecting the yielding energy absorption device 2 with rod bodies with different diameters.
Will the utility model discloses when being applied to in tunnel or tunnel, at first according to the design pressure load of stepping down, the biggest pressure volume of stepping down and the position of stepping down, adjust the pressure limiting valve threshold value through adjusting prestressing force adjusting bolt 2301, through selecting the pressure energy-absorbing device 2 or the pressure energy-absorbing device 2 of stepping down of the different figure of series connection of stepping down of different model sizes to adjust the biggest pressure volume of stepping down, adjust the pressure location of stepping down through the length of adjusting interior anchor section body of rod 1 and outer anchor section body of rod 3, will step down after all regulation are accomplished and assemble the pressure energy-absorbing device 2 and the stock body of rod, secondly punch in the country rock, then utilize the anchor agent anchor to the country rock in with the stock, install spacing layer board 5 again, utilize 6 fixed stock at last.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention as described in the specification and drawings, which should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a let and press energy-absorbing device suitable for let and press stock, includes interior anchor section body of rod (1), outer anchor section body of rod (3), spacing layer board (5), its characterized in that: the energy-absorbing and pressure-yielding device is characterized by further comprising one or more pressure-yielding and energy-absorbing devices (2), wherein the pressure-yielding and energy-absorbing devices (2) are connected with the inner anchor section rod body (1) and the outer anchor section rod body (3); let pressure energy-absorbing device (2) constitute by dowel steel (22) and cavity casing (21), dowel steel (22) comprise dowel steel (2201) and end fixed connection's piston (2202), piston (2202) are located cavity casing (21) intracavity, will cavity casing (21) inner chamber is separated for compression chamber (2110) and backward flow chamber (2111), compression chamber (2110) are full of hydraulic oil (25), the conch wall of cavity casing (21) is inside to be provided with the connection overflow path (2107) of compression chamber (2110) and backward flow chamber (2111) overflow path (2107) and compression chamber (2110) junction set up pressure limiting valve (23).
2. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 1, wherein: the transmission shaft (22) is connected with the inner anchor section rod body (1) through a connecting bolt (4), and the cavity shell (21) is connected with the outer anchor section rod body (3) through the connecting bolt (4).
3. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 1, wherein: the cavity shell (21) is provided with a stop valve mounting hole (2104) for mounting a stop valve (24).
4. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 1, wherein: a force transmission shaft penetrating hole (2102) for the force transmission rod (2201) to penetrate out from the cavity shell (21) is formed in the cavity shell (21); an outlet hole sealing ring (2103) is arranged on the outlet hole (2102) of the force transmission shaft, so that hydraulic oil (25) is prevented from overflowing.
5. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 4, wherein: the cavity shell (21) is provided with a pressure limiting valve mounting hole (2105) for mounting the pressure limiting valve (23), and the pressure limiting valve (23) is connected with the pressure limiting valve mounting hole (2105) through threads.
6. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 5, wherein: the pressure limiting valve (23) comprises a prestress adjusting bolt (2301), a spring (2302) and a marble (2305); two ends of the spring (2302) are respectively connected with the prestress adjusting bolt (2301) and the marble (2305).
7. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 6, wherein: the diameter of the marble (2305) is larger than the diameter of a connecting port of the pressure limiting valve mounting hole (2105) and the compression cavity (2110).
8. The yielding energy-absorbing device suitable for yielding anchor rods according to claim 1, wherein: piston (2202) with cavity casing (21) inside chamber wall contact position is provided with piston sealing washer (2203), piston sealing washer (2203) can obstruct compress chamber (2110) with the backward flow chamber (2111) carries out hydraulic oil exchange at the piston position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921910113.XU CN210919118U (en) | 2019-11-07 | 2019-11-07 | Let and press energy-absorbing device suitable for let and press stock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921910113.XU CN210919118U (en) | 2019-11-07 | 2019-11-07 | Let and press energy-absorbing device suitable for let and press stock |
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| CN210919118U true CN210919118U (en) | 2020-07-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778347A (en) * | 2019-11-07 | 2020-02-11 | 长江水利委员会长江科学院 | Let and press stock with adjustable let pressure parameter |
| CN112699556A (en) * | 2020-12-31 | 2021-04-23 | 长江水利委员会长江科学院 | Construction method of structural yielding model of energy-absorbing anchor rod/anchor cable |
-
2019
- 2019-11-07 CN CN201921910113.XU patent/CN210919118U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778347A (en) * | 2019-11-07 | 2020-02-11 | 长江水利委员会长江科学院 | Let and press stock with adjustable let pressure parameter |
| CN110778347B (en) * | 2019-11-07 | 2024-06-18 | 长江水利委员会长江科学院 | Yielding anchor rod with adjustable yielding parameters |
| CN112699556A (en) * | 2020-12-31 | 2021-04-23 | 长江水利委员会长江科学院 | Construction method of structural yielding model of energy-absorbing anchor rod/anchor cable |
| CN112699556B (en) * | 2020-12-31 | 2022-08-23 | 长江水利委员会长江科学院 | Construction method of structural yielding model of energy-absorbing anchor rod/anchor cable |
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