CN114593989A - Ballastless track cohesion parameter assembly type measuring device and measuring method thereof - Google Patents
Ballastless track cohesion parameter assembly type measuring device and measuring method thereof Download PDFInfo
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- CN114593989A CN114593989A CN202210500336.9A CN202210500336A CN114593989A CN 114593989 A CN114593989 A CN 114593989A CN 202210500336 A CN202210500336 A CN 202210500336A CN 114593989 A CN114593989 A CN 114593989A
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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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
The invention discloses an assembled measuring device and a measuring method for a ballastless track cohesion parameter, and the assembled measuring device comprises a lifting platform, wherein a vertical push plate device for pushing a test piece is arranged in the center of the lifting platform; the two sides of the lifting platform also comprise a first fixing device lifting platform and a second fixing device lifting platform; the first fixing device lifting platform and the second fixing device lifting platform are respectively provided with a first assembling fixing device and a second assembling fixing device which are used for fixing the test piece. According to the invention, a test piece is leveled by arranging a first fixing device lifting platform and a second fixing device lifting platform, and the test piece is pushed by arranging a vertical push plate device; and a force-displacement relation curve in the normal direction of the interlayer interface can be measured through a data acquisition device, and the normal rigidity, the strength and the fracture energy of the interlayer interface are calculated through a formula according to the corresponding relation curve.
Description
Technical Field
The invention belongs to the technical field of engineering measurement, and particularly relates to an assembled measuring device and a measuring method for a ballastless track cohesion parameter.
Background
The high-speed railway in China has the characteristics of long mileage, wide crossing area, complex operation environment, large transportation capacity and the like. The plate-type ballastless track structure becomes the main structure of the high-speed railway in China with the advantages of high smoothness, less maintainability and the like. The slab ballastless track structure mainly comprises a track slab, a CA mortar layer and a supporting layer. The track slab and the supporting layer are made of reinforced concrete and concrete materials, and the two layers are filled and cured by a CA mortar layer or a self-compacting concrete layer to form a multi-layer heterogeneous material composite sheet structure.
The interface of the ballastless track structure is a connecting surface formed by casting in sequence and is also an interface of materials with different mechanical properties, so that the interface is easy to become a weak part of the slab ballastless track structure. The plate-type ballastless track structure is easy to bond along the weak interface part to fail under the repeated action of temperature load in a daily state and the action of cyclic impact load of a train after service, so that interlayer separation is generated. Under the multi-field coupling effect such as "wet + hot + train", the crack further expands, leads to the train to pat the track board repeatedly or the buckling upwarp appears in vertical plate formula track structure when serious, directly threatens the travelling safety of high-speed train and the comfort level of taking, becomes one of the board-like ballastless track structure operation maintenance urgent need to be solved.
When theoretical calculation is carried out, the interlayer damage of the CRTSII type plate type ballastless track structure can be expressed by adopting a cohesive force unit. Therefore, the cohesion parameter becomes an important index of the mechanical property of the interlayer interface of the ballastless track structure. Measuring the cohesion parameter of an interlayer interface of a CRTSII type slab ballastless track structure, and mainly obtaining the relationship between the interlayer interface force and displacement; at present, for normal cohesion parameters, indirect indoor test methods such as a split-draw test and the like are often adopted; however, the requirement of indoor test equipment is high, the steps are complicated, and the popularization of the test is not facilitated; in addition, the obvious size effect exists in the indoor test result, so that the mechanical parameters of the interface are large, and the structure performance of the ballastless track is difficult to accurately evaluate. Therefore, it is an urgent need to develop an accurate and simple device and method for measuring the cohesion parameter of the interlayer interface of the slab ballastless track structure.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an assembled measuring device for the cohesion parameter of a ballastless track and a measuring method thereof, which solve the problems of large mechanical parameters and complicated steps of the existing indoor measuring device.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
on one hand, the assembled measuring device for the cohesion parameter of the ballastless track comprises a lifting platform, wherein a vertical push plate device for pushing a test piece is arranged in the center of the lifting platform, and a first fixing device lifting platform and a second fixing device lifting platform are arranged on two sides of the lifting platform;
a first assembling and fixing device and a second assembling and fixing device for fixing a test piece are respectively arranged on the first fixing device lifting platform and the second fixing device lifting platform;
the top of the vertical push plate device is provided with a test piece interlayer for avoiding bending of the test piece, and the top of the test piece interlayer is provided with a data acquisition device for acquiring vertical displacement of the test piece.
According to the invention, a test piece is leveled by arranging a first fixing device lifting platform and a second fixing device lifting platform, and the test piece is pushed by arranging a vertical push plate device; the method has the advantages of low equipment requirement, simplicity in operation and normal interface mechanical parameters, can accurately evaluate the structural performance of the ballastless track, can measure a force-displacement relation curve in the normal direction of the interlayer interface through the data acquisition device, and calculates the normal stiffness, strength and fracture energy of the interlayer interface through a formula according to the corresponding relation curve.
Further, the test piece comprises an upper concrete test piece, the two ends of the bottom of the upper concrete test piece are respectively provided with a CA mortar test piece, and the bottoms of the CA mortar test pieces at the two ends are provided with lower concrete test pieces.
Further, a test piece mold is arranged on the lifting platform and comprises a mold lifting platform and two symmetrically arranged lower concrete test piece molds, and the lower concrete test piece molds are used for accommodating lower concrete test pieces; and a CA mortar edge sealing die for placing CA mortar test pieces is arranged at the top of the lower concrete test piece die, and both sides of the CA mortar edge sealing die are respectively provided with a CA mortar edge sealing die grouting hole for injecting CA mortar and a CA mortar edge sealing die exhaust hole for uniformly discharging CA mortar.
Furthermore, a steel pipe penetrates through the lower concrete sample mold, and two ends of the steel pipe penetrate through two sides of the lower concrete sample mold.
Furthermore, the first and second assemblable fixing devices each include a fixing device lower platform on which a plurality of fixing device internal baffles for clamping a lower concrete sample are mounted, and the fixing device internal baffles are matched with the fixing device nuts through a plurality of fixing device screws and fixedly connected with the fixing device external baffles.
Further, the vertical plate pushing device comprises a loading plate, a pressure sensor and a jack, one end of the jack is fixedly connected with the lifting platform, the other end of the jack is sequentially provided with the pressure sensor and the loading plate, the pressure sensor is electrically connected with the automatic data acquisition instrument, and the loading plate is tightly attached to the lower steel plate.
Further, the test piece intermediate layer includes upper portion steel sheet and lower part steel sheet, and the upper portion steel sheet sets up in upper portion concrete test piece top, and the lower part steel sheet sets up in upper portion concrete test piece bottom, and the upper portion steel sheet passes through splint locking bolt and lower part steel sheet fixed connection.
Furthermore, the data acquisition device comprises an automatic data acquisition instrument, a first vertical displacement measuring instrument and a second vertical displacement measuring instrument, the automatic data acquisition instrument is electrically connected with the first vertical displacement measuring instrument and the second vertical displacement measuring instrument respectively, and the first vertical displacement measuring instrument and the second vertical displacement measuring instrument are arranged on the top of the upper steel plate.
On the other hand, the measuring method of the assembled measuring device for the ballastless track cohesion parameter is further provided, and the measuring method specifically comprises the following steps:
s1, placing the lower concrete sample in a lower concrete sample mould, then installing a CA mortar edge sealing mould, and then placing the upper concrete sample; reserving 30mm between the upper concrete test piece and the lower concrete test piece by adjusting the height of the mould lifting platform;
s2, injecting a CA mortar material through the CA mortar edge sealing die grouting hole, and sequentially plugging the CA mortar edge sealing die grouting hole and the CA mortar edge sealing die exhaust hole when the CA mortar is uniformly leaked out of the CA mortar exhaust hole of the CA mortar edge sealing die;
s3, disassembling the test piece die after the CA mortar is formed;
s4, placing an upper steel plate on the upper surface of the upper concrete sample, placing a lower steel plate on the lower surface of the upper concrete sample, and locking the upper steel plate and the lower steel plate through a clamping plate locking bolt;
s5, adjusting the heights of the first fixing device lifting platform and the second fixing device lifting platform, respectively installing a first assembling fixing device and a second assembling fixing device, and respectively assembling the test piece to the first assembling fixing device and the second assembling fixing device; then, the height of the first fixing device lifting platform and the height of the second fixing device lifting platform are adjusted to enable the test piece to be kept horizontal;
s6, adjusting the height of the lifting platform, and sequentially placing a jack, a pressure sensor and a loading plate to enable the loading plate to be tightly attached to the lower steel plate;
s7, adjusting the height of the lifting platform to enable the loading plate to be arranged at the center of the bottom of the lower steel plate and apply vertical jacking force;
s8, debugging the automatic data acquisition instrument to ensure that test data can be automatically acquired and stored;
s9, controlling the loading rate of the jack and keeping the loading rate uniform by controlling the jack to vertically apply thrust until the test piece is damaged;
s10, after the test is finished, the height of the lifting platform is reduced, then the vertical push plate devices are sequentially disassembled, and finally the first assembling and fixing device and the second assembling and fixing device of the test piece on the left side and the right side are disassembled;
and S11, recording the vertical displacement and the vertical jacking force of the left side and the right side of the upper concrete test piece by the automatic data acquisition instrument, thus obtaining a normal force-displacement relation curve of the interlayer interface, and obtaining the normal cohesion force parameter of the interface of the ballastless track slab and the CA mortar layer by calculation.
The invention discloses an assembled measuring device and a measuring method for a ballastless track cohesion parameter, which have the following beneficial effects:
1. according to the invention, a test piece is leveled by arranging a first fixing device lifting platform and a second fixing device lifting platform, and the test piece is pushed by arranging a vertical push plate device; the method has the advantages of low equipment requirement, simplicity in operation and normal interface mechanical parameters, can accurately evaluate the structural performance of the ballastless track, can measure a force-displacement relation curve in the normal direction of the interlayer interface through the data acquisition device, and calculates the normal stiffness, strength and fracture energy of the interlayer interface through a formula according to the corresponding relation curve.
2. The invention is loaded with three layers of test samples and is used for simulating the CRTSII type slab ballastless track structure. Injecting CA mortar between the concrete test piece and the CA mortar edge sealing die through a grouting hole of the CA mortar edge sealing die, and after the CA mortar is uniformly discharged from the exhaust hole 1003, finishing the CA mortar injection; and finally, bonding the top and bottom concrete test pieces by pouring CA mortar to form an integral test piece with a multilayer structure.
Drawings
Fig. 1 is a schematic diagram of a vertical push plate test structure of an assembled measuring device for a ballastless track cohesion parameter.
Fig. 2 is a schematic diagram of an assembling and fixing device of an assembled measuring device for a ballastless track cohesion parameter.
Fig. 3 is a schematic view of an overall test piece mold of an assembled measuring device for a ballastless track cohesion parameter.
Fig. 4 is a schematic view of a test piece interlayer of an assembled measuring device for a ballastless track cohesion parameter.
Wherein, 1, an automatic data acquisition instrument; 101. a vertical displacement measuring instrument; 102. a vertical displacement measuring instrument; 2. a lifting platform; 3. a first fixing device lifting platform; 4. a second fixing device lifting platform; 5. a vertical push plate device; 501. a loading plate of the vertical plate pushing device; 502. a pressure sensor of the vertical push plate device; 503. a jack of the vertical push plate device; 6. a first assemblable fixture; 601. a fixture screw; 602. a fixture nut; 603. a fixture outer barrier; 604. a fixture internal baffle; 605. a fixing device lower platform; 7. a second assemblable fixture; 8. a test piece interlayer; 801. an upper steel plate; 802. the clamping plate locks the bolt; 803. a lower steel plate; 9. a test piece; 901. an upper concrete specimen; 902. CA mortar test piece; 903. a lower concrete specimen; 904. a steel pipe; 10. a test piece mold; 1001. a CA mortar edge sealing die; 1002. a lower concrete sample mold; 1003. CA mortar seals the mold vent hole; 1004. grouting holes of a CA mortar edge sealing die; 1005. and a mould lifting platform.
Detailed Description
The embodiments of the present invention are described so as to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
According to a first embodiment of the present application, referring to fig. 1, the present embodiment provides an assembled measuring device for a ballastless track cohesion parameter, including a lifting platform 2, wherein a vertical push plate device 5 for pushing a test piece 9 is installed at the center of the lifting platform 2; the two sides of the lifting platform 2 also comprise a first fixing device lifting platform 3 and a second fixing device lifting platform 4; the first fixing device lifting platform 3 and the second fixing device lifting platform 4 are respectively provided with a first assembling fixing device 6 and a second assembling fixing device 7 for fixing a test piece 9; the top of the vertical push plate device 5 is provided with a test piece interlayer 8 for avoiding bending of the test piece 9, and the top of the test piece interlayer 8 is provided with a data acquisition device for acquiring the vertical displacement of the test piece 9.
Referring to fig. 3, as a further scheme of the scheme for clamping the test piece 9, the clamping test piece 9 specifically includes an upper concrete piece 901, a CA mortar piece 902 and a lower concrete piece 903; the two ends of the bottom of the upper concrete sample 901 are respectively a CA mortar sample 902, and the bottoms of the CA mortar samples 902 at the two ends are respectively a lower concrete sample 903.
Referring to fig. 2, as a further embodiment of the present invention, the first and second fittable fixing devices 6 and 7 each include a fixing device lower platform 605, a plurality of fixing device inner baffles 604 for clamping the lower concrete specimen 903 are mounted on the fixing device lower platform 605, and the fixing device inner baffles 604 are fixedly connected to the fixing device outer baffles 603 through the cooperation of a plurality of fixing device screws 601 and fixing device nuts 602.
Referring to fig. 1, as a further scheme of the vertical push plate device 5 of the present scheme, the vertical push plate device 5 includes a loading plate 501, a pressure sensor 502 and a jack 503, one end of the jack 503 is fixedly connected to the lifting platform 2, the other end of the jack 503 is sequentially provided with the pressure sensor 502 and the loading plate 501, the pressure sensor 502 is electrically connected to the automatic data acquisition instrument 1, and the loading plate 501 is tightly attached to a lower steel plate 803.
Referring to fig. 1 and 4, as a further scheme of the vertical test piece interlayer 8 of the scheme, the test piece interlayer 8 comprises an upper steel plate 801 and a lower steel plate 803, the upper steel plate 801 is arranged on the top of an upper concrete test piece 901, the lower steel plate 803 is arranged on the bottom of the upper concrete test piece 901, and the upper steel plate 801 is fixedly connected with the lower steel plate 803 through a clamping plate locking bolt 802.
Referring to fig. 1, as a further scheme of the data acquisition device of the present scheme, the data acquisition device includes an automatic data acquisition instrument 1, a first vertical displacement measurement instrument 101 and a second vertical displacement measurement instrument 102, the automatic data acquisition instrument 1 is electrically connected to the first vertical displacement measurement instrument 101 and the second vertical displacement measurement instrument 102, and the first vertical displacement measurement instrument 101 and the second vertical displacement measurement instrument 102 are both disposed on the top of an upper steel plate 801.
According to the second embodiment of the present application, this embodiment is an assembling process of a test piece 9, which specifically includes:
referring to fig. 3, a test piece 9 is assembled in a test piece mold 10, as a further aspect of the test piece mold 10 of the present disclosure, the test piece mold 10 includes a mold lifting platform 1005 and two symmetrically arranged lower concrete test piece molds 1002, and the lower concrete test piece molds 1002 are used for accommodating a lower concrete test piece 903; the top of the lower concrete sample mold 1002 is provided with a CA mortar edge sealing mold 1001 for placing a CA mortar sample 902, and both sides of the CA mortar edge sealing mold 1001 are respectively provided with a CA mortar edge sealing mold grouting hole 1004 for injecting CA mortar and a CA mortar edge sealing mold exhaust hole 1003 for uniformly discharging CA mortar.
In the invention, a steel pipe 904 penetrates through the lower concrete sample mold 1002, and two ends of the steel pipe 904 penetrate through two sides of the lower concrete sample mold 1002.
According to the third embodiment of the application, a measuring method of an assembled measuring device for the cohesion parameter of a ballastless track is provided, which specifically comprises the following steps:
s1, placing the lower concrete sample 903 in the lower concrete sample mold 1002, then installing a CA mortar edge sealing mold 1001, and then placing the upper concrete sample 901; reserving 30mm between the upper concrete test piece 901 and the lower concrete test piece 903 by adjusting the height of the mould lifting platform 1005;
s2, injecting a CA mortar material through the CA mortar edge sealing die grouting hole 1004, and blocking the CA mortar edge sealing die grouting hole 1004 and the CA mortar edge sealing die exhaust hole 1003 when CA mortar is uniformly leaked out of the CA mortar exhaust hole 1003;
s3, disassembling the test piece die 10 after the strength of the CA mortar meets the requirement;
s4, placing an upper steel plate 801 on the upper surface of an upper concrete test piece 901, placing a lower steel plate 803 on the lower surface of the upper concrete test piece 901, and locking the upper steel plate 801 and the lower steel plate 803 through a clamping plate locking bolt 802;
s5, adjusting the height of the lifting platform 2, and sequentially placing a jack 503, a pressure sensor 502 and a loading plate 501 to enable the loading plate 501 to be tightly attached to the lower steel plate 803;
s6, adjusting the heights of the first fixing device lifting platform 3 and the second fixing device lifting platform 4, respectively installing the first assembly fixing device 6 and the second assembly fixing device 7, and respectively assembling the test piece 9 on the first assembly fixing device 6 and the second assembly fixing device 7; then, the height of the first fixing device lifting platform 3 and the height of the second fixing device lifting platform 4 are adjusted to enable the test piece 9 to be kept horizontal;
s7, slowly adjusting the height of the lifting platform 2 to enable the loading plate 501 to be arranged at the center of the bottom of the lower steel plate 803 and apply vertical jacking force;
s8, debugging the automatic data acquisition instrument 1 to ensure that test data can be automatically acquired and stored;
s9, controlling the loading rate of the jack 503 and keeping the loading rate uniform by controlling the jack 503 to vertically apply thrust until the test piece 9 is damaged;
s10, after the test is finished, the height of the lifting platform 2 is reduced, then the vertical push plate devices 5 are sequentially disassembled, and finally the first assembling and fixing devices 6 and the second assembling and fixing devices 7 of the test pieces on the left side and the right side are disassembled;
s11, the automatic data acquisition instrument 1 records vertical displacement and vertical jacking force of the left side and the right side of the upper concrete test piece 901, so that a normal force-displacement relation curve of an interlayer interface is obtained, and normal cohesion parameters, such as normal rigidity, strength and fracture energy, of the interface between the ballastless track plate and the CA mortar layer are obtained through calculation.
While the embodiments of the invention have been described in detail in connection with the accompanying drawings, it is not intended to limit the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (9)
1. The utility model provides a ballastless track cohesion parameter assembled measuring device which characterized in that: the device comprises a lifting platform (2), wherein a vertical push plate device (5) for pushing a test piece (9) is installed in the center of the lifting platform (2), and a first fixing device lifting platform (3) and a second fixing device lifting platform (4) are further arranged on two sides of the lifting platform (2);
a first assembly fixing device (6) and a second assembly fixing device (7) for fixing a test piece (9) are respectively arranged on the first fixing device lifting platform (3) and the second fixing device lifting platform (4);
vertical push pedal device (5) top is provided with test piece intermediate layer (8) that are used for avoiding test piece (9) crooked, the data acquisition device who is used for gathering test piece (9) vertical displacement is installed at test piece intermediate layer (8) top.
2. The ballastless track cohesion parameter assembled measuring device of claim 1, characterized in that: the test piece (9) comprises an upper concrete test piece (901), the two ends of the bottom of the upper concrete test piece (901) are CA mortar test pieces (902), and the bottoms of the CA mortar test pieces (902) at the two ends are lower concrete test pieces (903).
3. The assembled measuring device for the cohesion parameter of the ballastless track of claim 2, wherein: a test piece die (10) is arranged on the lifting platform (2); the test piece mould (10) comprises a mould lifting platform (1005) and two symmetrically arranged lower concrete test piece moulds (1002), wherein the lower concrete test piece moulds (1002) are used for accommodating lower concrete test pieces (903); the top of the lower concrete sample mould (1002) is provided with a CA mortar edge sealing mould (1001) for placing a CA mortar sample (902), and the two sides of the CA mortar edge sealing mould (1001) are respectively provided with a CA mortar edge sealing mould grouting hole (1004) for injecting CA mortar and a CA mortar edge sealing mould exhaust hole (1003) for uniformly discharging CA mortar.
4. The assembled measuring device for the cohesion parameter of the ballastless track of claim 3, wherein: and a steel pipe (904) penetrates through the lower concrete sample mold (1002), and two ends of the steel pipe (904) penetrate through two sides of the lower concrete sample mold (1002).
5. The assembled measuring device for the cohesion parameter of the ballastless track of claim 1, which is characterized in that: the first assembly fixing device (6) and the second assembly fixing device (7) both comprise a fixing device lower platform (605), a plurality of fixing device inner baffles (604) used for clamping a lower concrete test piece (903) are mounted on the fixing device lower platform (605), and the fixing device inner baffles (604) are fixedly connected with a fixing device outer baffle (603) through matching of a plurality of fixing device screws (601) and fixing device nuts (602).
6. The assembled measuring device for the cohesion parameter of the ballastless track of claim 1, which is characterized in that: the vertical plate pushing device (5) comprises a loading plate (501), a pressure sensor (502) and a jack (503), one end of the jack (503) is fixedly connected with the lifting platform (2), the pressure sensor (502) and the loading plate (501) are sequentially arranged at the other end of the jack (503), the pressure sensor (502) is electrically connected with the automatic data acquisition instrument (1), and the loading plate (501) is tightly attached to a lower steel plate (803).
7. The assembled measuring device for the cohesion parameter of the ballastless track of claim 1, which is characterized in that: the test piece interlayer (8) comprises an upper steel plate (801) and a lower steel plate (803), the upper steel plate (801) is arranged at the top of an upper concrete test piece (901), the lower steel plate (803) is arranged at the bottom of the upper concrete test piece (901), and the upper steel plate (801) is fixedly connected with the lower steel plate (803) through a clamping plate locking bolt (802).
8. The assembled measuring device for the cohesion parameter of the ballastless track of claim 1, which is characterized in that: the data acquisition device comprises an automatic data acquisition instrument (1), a first vertical displacement measuring instrument (101) and a second vertical displacement measuring instrument (102), wherein the automatic data acquisition instrument (1) is electrically connected with the first vertical displacement measuring instrument (101) and the second vertical displacement measuring instrument (102) respectively, and the first vertical displacement measuring instrument (101) and the second vertical displacement measuring instrument (102) are arranged at the top of the upper steel plate (801).
9. The method for measuring the assembled measuring device for the cohesion parameter of the ballastless track according to any one of claims 1 to 8, is characterized by comprising the following steps:
s1, placing the lower concrete sample (903) in the lower concrete sample mold (1002), then installing a CA mortar edge sealing mold (1001), and then placing the upper concrete sample (901); reserving 30mm between the upper concrete test piece (901) and the lower concrete test piece (903) by adjusting the height of the mould lifting platform (1005);
s2, injecting CA mortar material through the CA mortar edge sealing die grouting hole (1004), and sequentially plugging the CA mortar edge sealing die grouting hole (1004) and the CA mortar edge sealing die exhaust hole (1003) when CA mortar seeps out of the CA mortar exhaust hole (1003) uniformly;
s3, disassembling the test piece die (10) after the CA mortar is formed;
s4, placing an upper steel plate (801) on the upper surface of an upper concrete test piece (901), placing a lower steel plate (803) on the lower surface of the upper concrete test piece (901), and locking the upper steel plate (801) and the lower steel plate (803) through a clamping plate locking bolt (802);
s5, adjusting the heights of the first fixing device lifting platform (3) and the second fixing device lifting platform (4), respectively installing a first assembly fixing device (6) and a second assembly fixing device (7), and respectively assembling a test piece (9) on the first assembly fixing device (6) and the second assembly fixing device (7); then, the height of the first fixing device lifting platform (3) and the height of the second fixing device lifting platform (4) are adjusted to enable the test piece (9) to be kept horizontal;
s6, adjusting the height of the lifting platform (2), and sequentially placing a jack (503), a pressure sensor (502) and a loading plate (501) to enable the loading plate (501) to be tightly attached to the lower steel plate (803);
s7, adjusting the height of the lifting platform (2), so that the loading plate (501) is arranged at the bottom center position of the lower steel plate (803), and applying vertical jacking force;
s8, debugging the automatic data acquisition instrument (1) to ensure that test data can be automatically acquired and stored;
s9, controlling the loading rate of the jack (503) and keeping the loading rate uniform by controlling the jack (503) to vertically apply thrust until the test piece (9) is damaged;
s10, after the test is finished, the height of the lifting platform (2) is reduced, then the vertical push plate devices (5) are sequentially disassembled, and finally the first assembly fixing devices (6) and the second assembly fixing devices (7) on the left side and the right side are disassembled;
s11, recording vertical displacement and vertical jacking force of the left side and the right side of the upper concrete test piece (901) by the automatic data acquisition instrument (1), thus obtaining a normal force-displacement relation curve of an interlayer interface, and obtaining normal cohesion parameters of the interface of the ballastless track slab and the CA mortar layer through calculation.
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Citations (21)
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