LU500213B1 - Concrete loading device for simulating stress state of any point of tunnel - Google Patents
Concrete loading device for simulating stress state of any point of tunnel Download PDFInfo
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- LU500213B1 LU500213B1 LU500213A LU500213A LU500213B1 LU 500213 B1 LU500213 B1 LU 500213B1 LU 500213 A LU500213 A LU 500213A LU 500213 A LU500213 A LU 500213A LU 500213 B1 LU500213 B1 LU 500213B1
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- 238000012360 testing method Methods 0.000 claims abstract description 60
- 238000002360 preparation method Methods 0.000 claims abstract description 39
- 238000007906 compression Methods 0.000 claims abstract description 13
- 230000001808 coupling effect Effects 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 123
- 239000010959 steel Substances 0.000 claims description 123
- 239000010720 hydraulic oil Substances 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 150000002500 ions Chemical class 0.000 claims description 15
- 239000003921 oil Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 230000003628 erosive effect Effects 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000009533 lab test Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0094—Moulds for concrete test samples
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present disclosure discloses a concrete loading device for simulating a stress state of any point of a tunnel. The concrete loading device is formed by matching a preparation unit and a loading unit that are independent of each other. The preparation unit is used for preparing a concrete test block (1). The loading unit is used for loading the concrete test block (1). The concrete loading device is used for studying the durability of a subway tunnel lining concrete structure under a coupling action of actual stress state and the environment of the subway tunnel lining concrete structure. Actual stress of the subway tunnel lining concrete structure is simulated by adjusting tension-compression force, which accurately reflects an actual stress state of the subway tunnel lining concrete structure. A subway tunnel lining degradation law can be summarized through laboratory tests, so as to establish a subway tunnel lining concrete structure degradation model to guide the design, construction, and curing of a subway tunnel project. The concrete loading device is simple in structure, and easy and convenient to operate, and has practical significance and popularization prospect.
Description
CONCRETE LOADING DEVICE FOR SIMULATING STRESS STATE OF ANY HUS00213
[01] The present disclosure belongs to the technical field of concrete loading test equipment, and particularly, relates to a concrete loading device for simulating a stress state of any point of a tunnel, which really simulates the stress state of any point of a subway tunnel lining by adjusting different tension-compression force.
[02] The process of urbanization is inevitably accompanied by the explosion of urban population, so that the urban population is over-saturated, resulting in increasingly serious traffic problems and serious urban road congestion. However, the construction of subways is an effective means for alleviating this problem. Urban subway tunnels are expensive, and the performance of a subway tunnel lining structure is directly related to the service life of a subway tunnel. Compared with a ground structure, the stress of an underground structure is complex. Therefore, it is particularly important to design a loading device for simulating a stress state at any point of a subway tunnel lining and study the performance of the subway tunnel lining structure through laboratory tests.
[03] In the prior art, as for the concrete durability loading device, a concrete specimen is mainly subjected to pure bending, axial tension, and axial compression, which cannot actually reflect that the actual stress of a subway tunnel lining concrete structure is a combined stress of different tension forces and compression forces. For example: in an accelerated corrosion test device for a tunnel lining structure in a loading state disclosed by Chinese patent 201610038324.3, a high-strength force transfer threaded pull rod is arranged on each of the front side and the rear side of the lower part of a tunnel lining component. The high-strength force transfer threaded pull rods penetrate through a left loading beam, a right loading beam, and a self-reaction force beam in sequence. Two ends of the high-strength force transfer threaded pull rods are 1 connected to anchoring bolts.
The left loading beam and the right loading beam are HUS00213 respectively in contact with the left end and the right end of the lower part of the tunnel lining component through force transfer gaskets.
The self-reaction force beam is located on the right side of the right loading beam, and a horizontal hydraulic jack is fixed to the left surface of the self-reaction force beam.
The left end of the hydraulic jack is connected to the right surface of the right loading beam through a pressure sensor.
Strain gauges and displacement meters are mounted on the surfaces of both concrete and a steel bar of the tunnel lining component.
The hydraulic jack, the pressure sensor, the strain gauges, and the displacement meters are all connected to a data processing and control system.
A water storage tank is arranged at the top of the tunnel lining component.
The water storage tank is formed by a waterproof material enclosed at the top of the tunnel lining component.
A stainless steel mesh is placed in the water storage tank.
The stainless steel mesh is electrically connected to a cathode of a steady-current direct-current power supply through a wire.
The steel bar of the tunnel lining component is electrically connected to an anode of the steady-current direct-current power supply through a wire.
A concrete durability test device under a coupling action of load-chlorine erosion disclosed by Chinese patent 201910391974.X includes a test device and an oil supply device.
The test device consists of a water tank, and an upper plate, a middle plate, a lower plate, and a jack located in the water tank.
The upper plate, the middle plate, and the lower plate are all arranged horizontally.
The upper plate, the middle plate, and the lower plate are connected through two or more than two bolts.
Nuts for limiting the movement of the upper plate and the lower plate are arranged at two ends of the bolts.
The bolts penetrate through the middle plate, and the middle plate can move in the length direction of the bolts.
A concrete specimen to be tested is placed between the lower plate and the middle plate.
The jack for applying pressure to the concrete specimen through the middle plate is placed between the upper plate and the middle plate.
The water tank stores a salt solution for simulating a seawater environment.
The oil supply device consists of an oil pump, a motor, a flow divider, a pressure gauge with an electric contact, and a pressure control circuit.
The motor is used for increasing the pressure of the oil pump.
The flow divider is arranged on the oil pump, 2 and the oil pump provides hydraulic oil for the jack through the flow divider. The 17900815 pressure gauge with the electric contact is arranged on the flow divider, and 1s used for detecting the pressure of the hydraulic oil output by flow divider. The pressure control circuit controls the on-off state of the motor by detecting the state of the pressure gauge with the electric contact, so that the jack applies a relatively constant pressure to the concrete specimen; or a lining structure is loaded in a mode of providing axial pressure for the concrete specimen through the jack, or in a mode of leading-in by loading a bending moment through the jack, which studies the durability of the concrete structure under the action of only one load. However, a stress structure of the subway tunnel lining structure is complex. Therefore, concrete preparation and loading test equipment which can simulate the stress state at any point of the lining concrete structure is designed, researched, and developed, which studies the performance of the subway tunnel lining structure through the laboratory tests to guide the practice, and has economic and social benefits.
[04] The objective of the present disclosure is to research, develop, and design a concrete loading device for simulating a stress state of any point of a subway tunnel lining structure to overcome the defects in the prior art, so as to study the degradation performance and the mechanical properties of the tunnel lining structure in an actual stress state of an underground structure of the subway tunnel lining concrete structure.
[05] In order to achieve the above-mentioned objective, the concrete loading device for simulating a stress state of any point of a tunnel of the present disclosure is formed by matching a preparation unit and a loading unit that are independent of each other. A main body structure of the preparation unit includes a preparation unit bottom plate, vertical plates, connecting rods, fixed steel plates, die steel plates, die strip-shaped holes, deformed steel bars, and anchor plates. Two transverse clamping grooves and four longitudinal clamping grooves are formed in the upper surface of the preparation unit bottom plate. The vertical plates are arranged in the transverse clamping plates. The vertical plates are fixedly connected through the connecting rods. Two fixed steel plates 3 and two die steel plates are arranged in the longitudinal clamping grooves. The fixed HUS00213 steel plates are arranged outside the die steel plates. The two die steel plates are opposite to each other. The die strip-shaped holes are formed in the die steel plates. One end of each deformed steel bar is in bolted connection with the fixed steel plate. The other end of each deformed steel bar penetrates through the corresponding die strip-shaped hole to extend between the two die steel plates and to be connected to the corresponding anchor plate. A main body structure of the loading unit includes a preparation unit bottom plate, reaction force steel plates, high load steel plates, low load steel plates, high-position hydraulic oil cylinders, low-position hydraulic oil cylinders, long strip-shaped holes, and short strip-shaped holes. The reaction force steel plates, the high load steel plates, and the low load steel plates that are opposite to each other are arranged on the preparation unit bottom plate in sequence from two ends to the middle. The high-position hydraulic oil cylinders and the low-position hydraulic oil cylinders are arranged on the reaction force steel plates. The long strip-shaped holes are formed in the high load steel plates. The short strip-shaped holes are formed in the low load steel plates.
[06] The connecting rods, the fixed steel plates, and the die steel plates are all detachable; there are four deformed steel bars; the anchor plates are pre-buried in the concrete test block; the deformed steel bars and the anchor plates are welded into a whole; the high-position hydraulic oil cylinders and the low-position hydraulic oil cylinders are all HSG80 two-way hydraulic cylinders.
[07] The concrete loading device for simulating a stress state of any point of a tunnel of the present disclosure is used for studying the durability of the subway tunnel lining concrete structure under a coupling action of an actual stress state and the environment. A process of performing a durability test of subway lining concrete under a coupling action of continuous tension-compression load and ion erosion includes five steps of preparation of the test block, installation of the test block, application of stress, ion erosion, and result analysis in total:
[08] first, preparation of the test block: preparing concrete according to the water-cement ratio of the subway lining concrete structure, pouring the concrete 4 between the two die steel plates, removing the vertical plates, the connecting rods, the HUS00213 fixed steel plates, and the die steel plates after the concrete is initially set, and performing standard curing for 28 days to obtain a concrete test block anchored with the deformed steel bars and the anchor plates;
[09] second, installation of the test block: coating all surfaces except for the top surface of the concrete test block by using a waterproof coating; vertically placing the concrete test block on the preparation unit bottom plate; penetrating through the long strip-shaped holes by using upper deformed steel bars, and penetrating through the short strip-shaped holes by using lower deformed steel bars; respectively connecting the upper deformed steel bars to the high-position hydraulic oil cylinders and connecting the lower deformed steel bars to the low-position hydraulic oil cylinders by using clamps and nut components; arranging a water storage tank on the top surface of the concrete test block; coating the top surface outside the water storage tank by using the waterproof coating; pasting strain gages on the side surfaces of the concrete test block;
[10] third, application of stress: providing set tension-compression stress for the concrete test block by the high-position hydraulic oil cylinders and the low-position hydraulic oil cylinders according to the actual stress data of the subway lining, and maintaining the load by the clamps and the nut components;
[11] fourth, ion erosion: removing the concrete test block after the application of the stress in the third step together with the reaction force steel plates, the high load steel plates, the low load steel plates, the high-position hydraulic oil cylinders, and the low-position hydraulic oil cylinders from the preparation unit bottom plate, so that the preparation unit bottom plate is matched with other reaction force steel plates, high load steel plates, low load steel plates, high-position oil cylinders, and low-position oil cylinders to load other concrete test blocks; adding a salt solution with the same content of corrosive ions as that the water in the actual service environment of the subway lining into the water storage tank to corrode the concrete test blocks;
[12] fifth, result analysis: analyzing the diffusion law of the corrosive ions according to the concrete test blocks at different ages to obtain a deterioration law of the subway lining.
[13] Compared with the prior art, actual stress of the subway tunnel lining concrete HUS00213 structure is simulated by adjusting tension-compression force, which accurately reflects the actual stress state of the subway tunnel lining concrete structure. A subway tunnel lining degradation law can be summarized through the laboratory tests, so as to establish a subway tunnel lining concrete structure degradation model to guide the design, construction, and curing of a subway tunnel project. The concrete loading device is simple in structure, and easy and convenient to operate, and has practical significance and popularization prospect.
[14] FIG. 1 is a schematic diagram of a main body structure of a preparation unit of the present disclosure.
[15] FIG. 2 is a three-dimensional diagram of a main body structure of a loading unit of the present disclosure.
[16] FIG. 3 is a main view of a main body structure of the loading unit of the present disclosure.
[17] The present disclosure is further described hereinafter by embodiments in combination with accompanying drawings.
[18] Embodiment 1:
[19] A concrete loading device for simulating a stress state of any point of a tunnel of the present embodiment is formed by matching a preparation unit and a loading unit that are independent of each other. The preparation unit is used for preparing a concrete test block 1, and the loading unit is used for loading the concrete test block 1.
[20] A main body structure of the preparation unit of the present embodiment includes a preparation unit bottom plate 10, vertical plates 11, connecting rods 12, fixed steel plates 13, die steel plates 14, die strip-shaped holes 15, deformed steel bars 16, and anchor plates 17. Two transverse clamping grooves and four longitudinal clamping grooves are formed in the upper surface of the preparation unit bottom plate 10. The 6 vertical plates 11 are arranged in the transverse clamping plates. The vertical plates 11 HUS00213 are fixedly connected through the connecting rods 12. Two fixed steel plates 13 and two die steel plates 14 are arranged in the longitudinal clamping grooves. The fixed steel plates 13 are arranged outside the die steel plates 14. The two die steel plates 14 are opposite to each other. The die strip-shaped holes 15 are formed in the die steel plates
14. One end of each deformed steel bar 16 is in bolted connection with the fixed steel plate 13, and the other end of each deformed steel bar 16 penetrates through the corresponding die strip-shaped hole 15 to extend between the two die steel plates 14 and to be connected to the corresponding anchor plate 17.
[21] A main body structure of the loading unit of the present embodiment includes a preparation unit bottom plate 20, reaction force steel plates 21, high load steel plates 22, low load steel plates 23, high-position hydraulic oil cylinders 24, low-position hydraulic oil cylinders 25, long strip-shaped holes 26, and short strip-shaped holes 27. The reaction force steel plates 21, the high load steel plates 22, and the low load steel plates 23 that are opposite to each other are arranged on the preparation unit bottom plate 20 in sequence from two ends to the middle. The high-position hydraulic oil cylinder 24 and the low-position hydraulic oil cylinders 25 are arranged on the reaction force steel plates
21. The long strip-shaped holes 26 are formed in the high load steel plates 22. The short strip-shaped holes 27 are formed in the low load steel plates 23.
[22] The connecting rods 12, the fixed steel plates 13, and the die steel plates 14 of the present embodiment are all detachable. There are four deformed steel bars 16. The anchor plates 17 are pre-buried in the concrete test block 1. The deformed steel bars 16 and the anchor plates 17 are welded into a whole. The high-position hydraulic oil cylinders 24 and the low-position hydraulic oil cylinders 25 are all HSG80 two-way hydraulic cylinders.
[23] The concrete loading device for simulating a stress state of any point of a tunnel of the embodiment is used for studying the durability of a subway tunnel lining concrete structure under a coupling action of actual stress state and the environment of the subway tunnel lining concrete structure.
[24] A process of performing a durability test of subway lining concrete under a 7 coupling action of a continuous tension-compression load and ion erosion by using the HUS00213 concrete loading device for simulating a stress state of any point of a tunnel of the present embodiment includes five steps of preparation of the test block, installation of the test block, application of stress, ion erosion, and result analysis in total:
[25] 1. Preparation of the test block: concrete is prepared according to the water-cement ratio of the subway lining concrete structure; the concrete is poured between the two die steel plates 14; the vertical plates 11, the connecting rods 12, the fixed steel plates 13, and the die steel plates 14 are removed after the concrete is initially set; the concrete is subjected to standard curing for 28 days to obtain a concrete test block 1 anchored with the deformed steel bars 16 and the anchor plates 17.
[26] 2. Installation of the test block: all surfaces except for the top surface of the concrete test block 1 is coated with a waterproof coating. The concrete test block 1 is vertically placed on the preparation unit bottom plate 20. Upper deformed steel bars 16 penetrate through the long strip-shaped holes 26, and lower deformed steel bars 16 penetrate through the long strip-shaped holes 26 and the short strip-shaped holes 27. The upper deformed steel bars 16 are connected to the high-position hydraulic oil cylinders 24, and the lower deformed steel bars 16 are connected to the low-position hydraulic oil cylinders 25 by using clamps and nut components 2 respectively. A water storage tank 3 is arranged on the top surface of the concrete test block 1. The top surface outside the water storage tank 3 is coated with the waterproof coating. Strain gauges 4 are pasted on the side surfaces (the side surfaces without the deformed steel bars 16) of the concrete test block 1.
[27] 3. Application of stress: set tension-compression stress is provided for the concrete test block 1 by the high-position hydraulic oil cylinders 24 and the low-position hydraulic oil cylinders 25 according to the actual stress data of the subway lining, and the load is maintained by the clamps and the nut components 2.
[28] 4. Ion erosion: the concrete test block 1 after the application of the stress in the third step is removed together with the reaction force steel plates 21, the high load steel plates 22, the low load steel plates 23, the high-position hydraulic oil cylinders 24, and the low-position hydraulic oil cylinders 25 from the preparation unit bottom plate 20, so 8 that the preparation unit bottom plate 20 is matched with other reaction force steel plates HUS00213 21, high load steel plates 22, low load steel plates 23, high-position oil cylinders 24, and low-position oil cylinders 25 to load other concrete test blocks 1. A salt solution with the same content of corrosive ions as that the water in the actual service environment of the subway lining is added into the water storage tank 3 to corrode the concrete test blocks 1.
[29] 5. Result analysis: the diffusion law of the corrosive ions is analyzed according to the concrete test blocks 1 at different ages to obtain a deterioration law of the subway lining.
[30] Embodiment 2:
[31] The high-position hydraulic oil cylinders 24 of the present embodiment provide a tension force, the low-position hydraulic oil cylinders 25 provide a compression force, and the clamps and the nut components 2 ensure the load maintaining.
[32] Embodiment 3:
[33] The high-position hydraulic oil cylinders 24 of the present embodiment provide a compression force, the low-position hydraulic oil cylinders 25 provide a tension force, and the clamps and the nut components 2 ensure the load maintaining.
9
Claims (6)
1. A concrete loading device for simulating a stress state of any point of a tunnel, being formed by matching a preparation unit and a loading unit that are independent of each other, wherein the preparation unit is used for preparing a concrete test block, and the loading unit is used for loading the concrete test block.
2. The concrete loading device for simulating a stress state of any point of a tunnel according to claim 1, wherein a main body structure of the preparation unit comprises a preparation unit bottom plate, vertical plates, connecting rods, fixed steel plates, die steel plates, die strip-shaped holes, deformed steel bars, and anchor plates, two transverse clamping grooves and four longitudinal clamping grooves are formed in the upper surface of the preparation unit bottom plate; the vertical plates are arranged in the transverse clamping plates; the vertical plates are fixedly connected through the connecting rods; two fixed steel plates and two die steel plates are arranged in the longitudinal clamping grooves; the fixed steel plates are arranged outside the die steel plates; the two die steel plates are opposite to each other; the die strip-shaped holes are formed in the die steel plates; one end of each deformed steel bar is in bolted connection with the fixed steel plate, and the other end of each deformed steel bar penetrates through the corresponding die strip-shaped hole to extend between the two die steel plates and to be connected to the corresponding anchor plate.
3. The concrete loading device for simulating a stress state of any point of a tunnel according to claim 1, wherein a main body structure of the loading unit comprises a preparation unit bottom plate, reaction force steel plates, high load steel plates, low load steel plates, high-position hydraulic oil cylinders, low-position hydraulic oil cylinders, long strip-shaped holes, and short strip-shaped holes; the reaction force steel plates, the high load steel plates, and the low load steel plates that are opposite to each other are arranged on the preparation unit bottom plate in sequence from two ends to the middle; the high-position hydraulic oil cylinders and the low-position hydraulic oil cylinders are arranged on the reaction force steel plates; the long strip-shaped holes are formed in the high load steel plates; the short strip-shaped holes are formed in the low load steel 1 plates. LU500213
4. The concrete loading device for simulating a stress state of any point of a tunnel according to claims 2 to 3, wherein the connecting rods, the fixed steel plates, and the die steel plates are all detachable; there are four deformed steel bars; the anchor plates are pre-buried in the concrete test block; the deformed steel bars and the anchor plates are welded into a whole; the high-position hydraulic oil cylinders and the low-position hydraulic oil cylinders are all HSG80 two-way hydraulic cylinders.
5. The concrete loading device for simulating a stress state of any point of a tunnel according to claims 1 to 3, being used for studying the durability of a subway tunnel lining concrete structure under a coupling action of actual stress state and the environment of the subway tunnel lining concrete structure.
6. The concrete loading device for simulating a stress state of any point of a tunnel according to claims 1 to 3, wherein a process of performing a durability test of subway lining concrete under a coupling action of a continuous tension-compression load and ion erosion comprises five steps of preparation of the test block, installation of the test block, application of stress, ion erosion, and result analysis in total: first, preparation of the test block: preparing concrete according to the water-cement ratio of the subway lining concrete structure, pouring the concrete between the two die steel plates, removing the vertical plates, the connecting rods, the fixed steel plates, and the die steel plates after the concrete is initially set, and performing standard curing for 28 days to obtain a concrete test block anchored with the deformed steel bars and the anchor plates; second, installation of the test block: coating all surfaces except for the top surface of the concrete test block by using a waterproof coating; vertically placing the concrete test block on the preparation unit bottom plate, penetrating through the long strip-shaped holes by using upper deformed steel bars, and penetrating through the short strip-shaped holes by using lower deformed steel bars; respectively connecting the upper deformed steel bars to the high-position hydraulic oil cylinders and connecting the lower deformed steel bars to the low-position hydraulic oil cylinders by using clamps and nut components; arranging a water storage tank on the top surface of the 2 concrete test block, coating the top surface outside the water storage tank by using the HUS00213 waterproof coating; pasting strain gauges on the side surfaces of the concrete test block; third, application of stress: providing set tension-compression stress for the concrete test block by the high-position hydraulic oil cylinders and the low-position hydraulic oil cylinders according to the actual stress data of a subway lining, and maintaining the load by the clamps and the nut components; fourth, ion erosion: detaching the concrete test block after the application of the stress in the third step together with the reaction force steel plates, the high load steel plates, the low load steel plates, the high-position hydraulic oil cylinders, and the low-position hydraulic oil cylinders from the preparation unit bottom plate, so that the preparation unit bottom plate is matched with other reaction force steel plates, high load steel plates, low load steel plates, high-position oil cylinders, and low-position oil cylinders to load other concrete test blocks; adding a salt solution with the same content of corrosive ions as that the water in the actual service environment of the subway lining into the water storage tank to corrode the concrete test blocks; fifth, result analysis: analyzing the diffusion law of the corrosive ions according to the concrete test blocks at different ages to obtain a deterioration law of the subway lining.
3
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911345937.1A CN111006998B (en) | 2019-12-24 | 2019-12-24 | Concrete loading device for simulating stress state of any point of tunnel |
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|---|---|
| LU500213B1 true LU500213B1 (en) | 2021-06-28 |
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| LU500213A LU500213B1 (en) | 2019-12-24 | 2020-10-09 | Concrete loading device for simulating stress state of any point of tunnel |
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| CN (1) | CN111006998B (en) |
| LU (1) | LU500213B1 (en) |
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| CN116754468A (en) * | 2023-08-17 | 2023-09-15 | 华侨大学 | Tunnel surrounding rock concrete spouts layer corrosion simulation test device |
| CN118230636A (en) * | 2024-05-23 | 2024-06-21 | 石家庄铁道大学 | Tunnel lining structure model test device capable of pouring primary support |
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- 2020-10-09 WO PCT/CN2020/119925 patent/WO2021129040A1/en active Application Filing
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| Publication number | Publication date |
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| CN111006998B (en) | 2021-06-29 |
| WO2021129040A1 (en) | 2021-07-01 |
| CN111006998A (en) | 2020-04-14 |
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