CN107246992B - Counterforce device for roadbed flat plate load test and field test method - Google Patents
Counterforce device for roadbed flat plate load test and field test method Download PDFInfo
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- CN107246992B CN107246992B CN201710318152.XA CN201710318152A CN107246992B CN 107246992 B CN107246992 B CN 107246992B CN 201710318152 A CN201710318152 A CN 201710318152A CN 107246992 B CN107246992 B CN 107246992B
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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
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2203/00—Devices for working the railway-superstructure
- E01B2203/16—Guiding or measuring means, e.g. for alignment, canting, stepwise propagation
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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
Abstract
The invention relates to a counterforce device for a roadbed slab load test and a field test method, wherein the counterforce device comprises a pair of screw rod supporting mechanisms which are respectively fixedly connected with steel rails on two sides and a counterforce beam arranged between the two screw rod supporting mechanisms, and the bottom surface of the counterforce beam is contacted with a counterforce rod and provides counterforce for the counterforce rod; the field test method comprises the following steps: firstly, an optimal measuring point position scheme is determined, the device is connected with a steel rail after reaching a measuring point, then the height of the reaction beam is adjusted to be in contact with the top of the reaction rod, and the reaction beam is pre-pressurized to test the state of the reaction beam before detection begins, and then a test can be carried out. Compared with the prior art, the invention can adapt to the construction process of an AHM800R-CH type roadbed processing vehicle, and solves the problem of roadbed K30The detection faces two problems of insufficient operation space and difficulty in erecting the reaction device, the reaction device is high in erecting and transferring speed, the influence on construction is small, and zero interference on roadbed replacement operation can be realized.
Description
Technical Field
The invention belongs to the technical field of railway roadbed detection, and relates to a counterforce device for a roadbed slab load test and a field test method.
Background
The roadbed diseases can affect the transport capacity and the order of the railway, so that the existing railway of the ballast railway needs to regularly treat the damaged roadbed to ensure the continuous normal operation of the train. The conventional ballast railway roadbed is basically repaired by manpower, the mode is low in operation efficiency, the quality is not easy to control, the mode is limited by a construction skylight and an operation field, and the foundation bed replacement thickness is generally about 0.3 m. With the rapid development of railway construction in China, the traditional damaged roadbed treatment technology is difficult to meet the requirements of railway damaged roadbed treatment under heavy load and rapid strategy. In order to realize high efficiency and high quality of railway damaged roadbed treatment and accumulate practical experience for using large maintenance machinery later, China introduces an AHM800R-CH type roadbed treatment vehicle developed by Plasser & Theurer company of Austria in 2009, the roadbed treatment vehicle integrates multiple functions of ballast recovery, gravel backfilling, compaction and the like, can recover face ballast while cleaning out original ballast stones of a ballast bed, and the recovered old ballast is mixed with sand, stone powder and the like after being crushed, and is recycled and compacted to form a new roadbed protective layer. The method has the advantages that the standardized construction not only improves the efficiency and the quality of roadbed renovation, enables the replacement and filling thickness of the foundation bed to reach 0.5m, but also obviously reduces the material supply, transportation and other costs. At present, the AHM800R-CH type roadbed processing vehicle is successfully popularized and applied to ballast circuit foundation bed treatment in typical geological climate condition areas such as Shanghai, Nanning, Chengdu, Kunming, Harbin railway administration districts and the like. Therefore, the roadbed treatment vehicle with high reliability and integration is used for treating roadbed diseases, and is a development trend of maintenance of future work.
The method is important for checking the rationality of physical and mechanical parameters of backfill materials and construction parameters of a roadbed processing vehicle, ensuring the quality of a backfill foundation bed and detecting a roadbed. For a long time, the existing line roadbed detection method is difficult to obtain the roadbed deformation index, along with the high speed and heavy load of railways, the deformation control of the railway roadbed is more and more strict, and the foundation coefficient K is gradually changed by the engineering and academic circles30The method is introduced into the existing line roadbed detection, and the roadbed regulation and treatment effect is evaluated through a roadbed flat plate load test. However, the steel rails and the sleepers are always positioned right above the foundation bed in the whole process of the roadbed processing vehicle replacement construction, and the ballast discharging vehicle operates immediately after the ballast discharging vehicle, so that the foundation coefficient K is caused30The detection of (2) has two problems of insufficient working space and difficulty in erecting a reaction force device. By taking an Yimin-Alshan section roadbed processing vehicle construction project in the district of the Harbin railway administration as an example, a construction process for replacing and filling a foundation bed by using a roadbed processing vehicle is shown in figure 1, and the roadbed processing vehicle sequentially comprises a waste ballast conveying and recycling I, an old ballast crushing II, a small-excavation face ballast III, a large-excavation bottom ballast IV, an aggregate return construction and compaction V and a new aggregate conveying VI from front to back, wherein the ballast VII is returned to the roadbed processing vehicle at a certain distance from the rear of the roadbed processing vehicle. Wherein the interval between the aggregate return building and compaction V and the new aggregate conveying VI isA section A, wherein the first section A is a suspended section of the sleeper behind the vehicle-mounted compaction equipment; a second section B is arranged between the roadbed processing vehicle and the ballast unloading vehicle, and the second section B is an unfilled ballast section. It can be seen that only the first section a and the second section B have the test conditions. However, if the conventional roadbed slab load test is adopted to determine K30The detection work carried out in the first section A has a large influence on the operation of the roadbed processing vehicle, and the detection work carried out in the second section B has a large influence on the operation of the ballast discharging vehicle. In addition, in order to adapt to the operation characteristics of the roadbed at the roadbed processing vehicle, K30The detection operation should also be as simple and fast as possible.
At present, there is an existing roadbed K30When the detection method is directly applied to roadbed quality detection of the first section A and the second section B, due to the problems of insufficient field operation space, difficulty in erecting a counterforce device and the like, detection usually consumes a long time, and normal operation interference on a roadbed processing vehicle and a ballast discharging vehicle is large. Meanwhile, the erection of the reaction frame (such as a ground anchor reaction frame) can even cause a certain damage to the roadbed. Therefore, the traditional field test method cannot adapt to the efficient operation process of the roadbed processing vehicle.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the ballast unloading vehicle which can adapt to the operation characteristics of a roadbed processing vehicle and a ballast unloading vehicle and improve K30The reaction device for the roadbed slab load test has the advantages of detection efficiency and capability of better matching with the construction process of a roadbed processing vehicle, and the field test method.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a reaction device for dull and stereotyped load test of road bed, this reaction device utilizes the dead weight of a pair of rail and the sleeper that links to each other with the rail is fixed to provide the counter-force for the reaction rod among the dull and stereotyped load appearance, the device include a pair of screw rod supporting mechanism and the reaction roof beam of setting between two screw rod supporting mechanism with both sides rail fixed connection respectively, the bottom surface and the reaction rod of this reaction roof beam contact to provide the counter-force for the reaction rod. The reaction beam is fixedly connected with the steel rail through two symmetrical screw rod supporting mechanisms so as to provide reaction force for the reaction rod by using the self weight of the steel rail and the sleeper.
And the bottom surface of the counter-force beam is provided with a counter-force rod limiting groove matched with the top of the counter-force rod. The top card of reaction pole is established at the reaction pole spacing inslot to realize the spacing of reaction pole on reaction beam length direction through the reaction pole spacing groove, effectively reduce loading in-process K30The transverse movement of the counter-force rod in the flat plate load meter is convenient to ensure that the counter-force rod is stably contacted with the counter-force beam when a roadbed flat plate load test is carried out, and the safety of the counter-force applying process is improved.
A plurality of counter-force rod limiting grooves are uniformly formed in the bottom surface of the counter-force beam along the length direction of the counter-force beam, and the counter-force rod limiting grooves are located between the two screw rod supporting mechanisms. The plurality of reaction rod limiting grooves on the bottom surface of the reaction beam are convenient for the reaction rods to move in a certain range along the length direction of the reaction beam. According to actual test needs, the position of the reaction rod in the length direction of the reaction beam is adjusted, and the reaction rod is stably contacted with the reaction beam through the corresponding reaction rod limiting groove to realize K at different positions30And (6) detecting.
The screw supporting mechanism comprises a top plate and a bottom plate which are arranged in parallel one above the other and are respectively connected with the top end and the bottom end of the steel rail, and screws which penetrate through the top plate and the bottom plate and are respectively fixedly connected with the top plate and the bottom plate, and the counter-force beam is fixedly connected with the screws. The steel rail is tightly clamped between the top plate and the bottom plate, and the top plate, the bottom plate and the reaction beam are fixedly connected together through the screw rods.
Preferably, the reaction beam is perpendicular to the screw.
As a preferable technical scheme, the screw is a hollow screw.
The two sides of the counter-force beam are both provided with screw rods, counter-force beam bolts are arranged between the screw rods on the two sides, and the counter-force beam bolts are fixedly connected with the counter-force beam. The counter-force beam bolt is matched with the counter-force beam nut for use, the counter-force beam bolt penetrates through the two screw rods and the counter-force beam simultaneously, and the counter-force beam is tightly clamped in the middle through the two symmetrical screw rods so as to ensure the stability of the counter-force beam.
Preferably, the reaction beam is an i-shaped reaction beam.
The screw rod is evenly provided with a plurality of connecting holes along the axial direction of the screw rod, the counter-force beam is arranged between the two screw rods along the axial direction of the screw rod in a moving way and is fixedly connected with the screw rod through counter-force beam bolts and the connecting holes. The counter-force beam is provided with a counter-force beam screw hole, the position of the counter-force beam between the two screws is adjusted along the axial direction of the screws, namely the counter-force beam is adjusted to the required height, then the counter-force beam bolt simultaneously penetrates through the connecting hole and the counter-force beam screw hole, and the counter-force beam and the screws are tightly fixed together by utilizing the counter-force beam nut. The height adjustment is realized by the up-and-down movement of the reaction beam so as to adapt to different field conditions.
The two sides of the steel rail are both provided with screw rods, and the counter-force beam is fixedly connected with the two screw rods. Through the multi-point fixation, the balance and the stability of the device are ensured.
The both sides of rail all are equipped with the screw rod, and the both sides of counter-force roof beam all are equipped with the screw rod simultaneously, are equipped with four screw rods in every screw rod supporting mechanism promptly, and the ascending screw rod of fore-and-aft direction presss from both sides the counter-force roof beam in the centre, and the ascending screw rod of left and right sides presss from both sides the rail in the centre, makes the device have sufficient fastness and stability.
The screw rod is provided with a top plate nut and a bottom plate bolt, and the top plate and the bottom plate are both positioned between the top plate nut and the bottom plate bolt and are fixedly connected with the screw rod through the top plate nut and the bottom plate bolt respectively. The top plate nut and the bottom plate bolt respectively limit the top plate, the steel rail and the bottom plate in the vertical direction from the upper part and the lower part.
As the preferred technical scheme, the screw rod is further provided with a bottom plate nut, and the bottom plate nut is connected with the top surface of the bottom plate, so that the stability of the bottom plate is ensured.
The bottom plate is provided with a steel rail limiting groove matched with the bottom of the steel rail. The bottom of the steel rail is clamped in the steel rail limiting groove, so that the bottom plate can be better attached to the bottom surface of the steel rail and limit the steel rail.
Different bottom plates can be replaced according to actual requirements so as to adapt to the steel rails of different types.
A field test method for carrying out roadbed slab load test by adopting the counterforce device specifically comprises the following steps:
(1) determining an optimal measuring point position scheme by combining measuring point arrangement requirements of a roadbed flat plate load test and operation arrangement of a roadbed processing vehicle;
(2) assembling the counter-force beam, the screw and the top plate together and placing the counter-force beam, the screw and the top plate at a preset position on the steel rail;
(3) assembling the bottom plate on the screw rod, then adjusting the height of the reaction beam to enable the bottom surface of the reaction beam to be in contact with the top of the reaction rod, and fixedly connecting the reaction beam and the screw rod together;
(4) pre-pressurizing to test the working state of the counterforce device, and then carrying out a roadbed slab load test;
(5) after the test of the measuring point is finished, the bottom plate is dismantled, and the device is moved to the next measuring point;
(6) and (5) repeating the steps (3) to (5) until the test of all the test points is completed.
When the AHM800R-CH type roadbed processing vehicle is used for construction, two positions are provided for conveniently erecting the counter-force device and developing a roadbed K30And (3) detection: the first section is a suspended section of the sleeper behind the vehicle-mounted compaction equipment, and the second section is an unfilled ballast section between the roadbed processing vehicle and the ballast unloading vehicle. In the first section, K30The detection has the advantages that the backfill and compaction quality of the foundation bed can be reflected immediately, so that backfill and compaction parameters can be adjusted most quickly, and the influence of parameter mismatching on the quality of the roadbed is reduced to the maximum extent. In the second section K30The detection has the advantages that the operation space is larger, and the normal operation of the roadbed processing vehicle is not influenced.
In the step (1), the measuring points are selected according to the following steps: when the construction is started, detecting in the first section; and after the parameters are proved to be reasonable, the detection in the second section is taken as the main point, and the sampling inspection can be carried out in the first section after the construction is carried out for a certain distance. Wherein K in the first section30Detection, namely determining the suspension of the roadbed processing vehicle during the dispatching and maintenance of the old ballast recovery vehicle and the new material supply vehicle according to the operation procedures of the roadbed processing vehicle, such as excavation speed, backfill speed, maintenance plan and the likePosition, in combination with K30According to the detected measuring point arrangement requirement, a measuring point position scheme with the minimum influence on roadbed filling and ballast refilling operation is formulated; k in the second section30Detection, namely scheduling and ballast unloading vehicle operation arrangement according to the new material supply vehicle and combining K30And (5) making a measuring point position scheme with minimum influence on roadbed filling and ballast refilling operation according to the detected measuring point arrangement requirement.
In the step (2), the reaction beam, the screw and the top plate are assembled together before testing, so that rapid transfer and device erection are facilitated.
In the step (3), a bottom plate matched with the type of the steel rail is selected and symmetrically installed at the bottoms of the two steel rails so as to fix the counter-force beam, and K can be simultaneously erected in the period30A flat plate load cell.
In step (4), at K30Before the detection is started, the loading system pre-applies 20kPa pressure to test the working state of the counterforce device, removes the pre-applied pressure when abnormal conditions exist, adjusts the height of a flat plate load meter and the height of the counterforce beam, repeats the pre-loading process until the pre-loading response of the device is normal, and then performs the roadbed flat plate load test.
According to K30The flat plate load test is standard in operation, graded loading is carried out, and test results are recorded; quick calculation of foundation coefficient K30And comparing the target value with the target value to provide quantitative reference for adjustment of physical and mechanical parameters of the filler and construction parameters of the roadbed processing vehicle.
In the step (5), after the test of one test point is completed, the device can be moved to the next test point for testing only by dismounting and mounting the bottom plate.
The detection results of different positions can be obtained by repeating the steps.
Compared with the prior art, the invention has the following characteristics:
1) the reaction device occupies small space after being disassembled, has high erection and transfer speed during testing, can adapt to the construction process of an AHM800R-CH type roadbed processing vehicle, and reduces K as much as possible30Detecting the influence of operation on construction; meanwhile, the invention provides a method for using the counterforce device to realize the operation of the roadbed processing vehicle and the ballast unloading vehicleRoadbed K30The field test method solves the problem of the traditional foundation coefficient K by matching the counterforce device with the field test method30The two problems of insufficient operation space and difficult erection of the counterforce device faced by detection are solved, and the K in the construction process of the roadbed treatment vehicle is improved30Speed of detection, reduced K30Detecting an impact on the operation of the road-based processing vehicle;
2) the counter-force device provides counter-force for the counter-force rod in the flat-plate load meter by utilizing the self-weight of the pair of steel rails and the sleeper fixedly connected with the steel rails, so that not only is the space saved, but also the damage of the existing counter-force devices such as a ground anchor counter-force frame and the like to the roadbed is avoided, and the safety is good;
3) when K is30When the detection scheme is formulated and considered in the operation process of the roadbed processing vehicle, namely K30When the detection scheme is matched with the operation procedures of the roadbed processing vehicle, zero interference of roadbed filling and replacing operation can be realized.
Drawings
FIG. 1 is a construction flow chart of changing and filling a foundation bed of an AHM800R-CH type roadbed processing vehicle;
FIG. 2 is a schematic front view showing a reaction force device according to embodiment 1;
FIG. 3 is a schematic left side view showing the structure of a reaction force device in accordance with embodiment 1;
FIG. 4 is a schematic bottom view of the reaction beam in example 1;
FIG. 5 is a schematic top view showing the screw supporting mechanism according to embodiment 1;
FIG. 6 is a schematic flow chart of a field test method in example 1;
the notation in the figure is:
the method comprises the following steps of 1-counter-force beam, 2-connecting hole, 3-counter-force beam bolt, 4-screw rod, 5-top plate, 6-top plate nut, 7-bottom plate, 8-steel rail, 9-bottom plate bolt, 10-counter-force rod limiting groove, I-waste ballast conveying and recycling, II-old ballast crushing, III-small excavation face ballast, IV-large excavation bottom ballast, V-aggregate reclamation and compaction, VI-new aggregate conveying, VII-ballast unloading vehicle reclamation ballast, A-first section and B-second section.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
as shown in fig. 2 and 3, the reaction force device for roadbed slab load test uses the self weight of a pair of rails 8 and sleepers fixedly connected with the rails 8 to provide reaction force for a reaction force rod in a slab load meter, the device comprises a pair of screw rod supporting mechanisms fixedly connected with the rails 8 on two sides respectively and a reaction force beam 1 arranged between the screw rod supporting mechanisms, and the bottom surface of the reaction force beam 1 is in contact with the reaction force rod and provides reaction force for the reaction force rod.
As shown in fig. 4, three reaction rod limiting grooves 10 adapted to the top of the reaction rod are uniformly formed in the bottom surface of the reaction beam 1 along the length direction of the reaction beam 1, and the reaction rod limiting grooves 10 are located between the two screw support mechanisms.
The screw supporting mechanism comprises a top plate 5 and a bottom plate 7 which are arranged in parallel one above the other and are respectively connected with the top end and the bottom end of the steel rail 8, and a screw 4 which penetrates through the top plate 5 and the bottom plate 7 and is respectively fixedly connected with the top plate 5 and the bottom plate 7, and the counter-force beam 1 is fixedly connected with the screw 4.
As shown in fig. 5, each screw support mechanism is provided with four screws 4, the screws 4 are provided on both sides of the reaction beam 1, and a reaction beam bolt 3 is provided between the screws 4 on both sides and is fixedly connected to the reaction beam 1 through the reaction beam bolt 3. Four connecting holes 2 are uniformly formed in the screw rod 4 along the axial direction of the screw rod 4, the counter-force beam 1 is arranged between the two screw rods 4 along the axial direction of the screw rod 4 and is fixedly connected with the screw rod 4 through the counter-force beam bolt 3 and the connecting holes 2. Both sides of the steel rail 8 are provided with screw rods 4, and the counter-force beam 1 is fixedly connected with the two screw rods 4. Be equipped with roof nut 6 and bottom plate bolt 9 on the screw rod 4, roof 5 and bottom plate 7 all are located between roof nut 6 and bottom plate bolt 9 to respectively through roof nut 6, bottom plate bolt 9 and screw rod 4 fixed connection. The bottom plate 7 is provided with a steel rail limiting groove matched with the bottom of the steel rail 8.
A field test method for carrying out a roadbed slab load test by adopting the counterforce device specifically comprises the following steps:
(1) determining an optimal measuring point position scheme by combining measuring point arrangement requirements of a roadbed flat plate load test and operation arrangement of a roadbed processing vehicle, wherein the specific flow is shown in FIG. 6;
(2) assembling the counter-force beam 1, the screw rod 4 and the top plate 5 together and placing the counter-force beam, the screw rod and the top plate at a preset position on the steel rail 8;
(3) assembling a bottom plate 7 on a screw rod 4, then adjusting the height of the reaction beam 1 to enable the bottom surface of the reaction beam 1 to be in contact with the top of a reaction rod, and fixedly connecting the reaction beam 1 and the screw rod 4 together;
(4) pre-pressurizing to test the working state of the counterforce device, and then carrying out a roadbed slab load test;
(5) after the test of the measuring point is finished, the bottom plate 7 is dismantled, and the device is moved to the next measuring point;
(6) and (5) repeating the steps (3) to (5) until the test of all the test points is completed.
Example 2:
in this embodiment, two reaction rod limiting grooves 10 adapted to the top of the reaction rod are uniformly formed in the bottom surface of the reaction beam 1 along the length direction of the reaction beam 1, and two connecting holes 2 are uniformly formed in the screw rod 4 along the axial direction of the screw rod 4, as in embodiment 1.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (3)
1. A counterforce device for roadbed slab load test, which utilizes the deadweight of a pair of rails (8) and sleepers fixedly connected with the rails (8) to provide counterforce for a counterforce rod in a slab load instrument, is characterized in that the device comprises a pair of screw rod supporting mechanisms fixedly connected with the rails (8) on two sides respectively and a counterforce beam (1) arranged between the two screw rod supporting mechanisms, wherein the bottom surface of the counterforce beam (1) is contacted with the counterforce rod and provides counterforce for the counterforce rod;
the screw supporting mechanism comprises a top plate (5) and a bottom plate (7) which are arranged in parallel up and down and are respectively connected with the top end and the bottom end of the steel rail (8), and screws (4) which simultaneously penetrate through the top plate (5) and the bottom plate (7) and are respectively fixedly connected with the top plate (5) and the bottom plate (7), and the counter-force beam (1) is fixedly connected with the screws (4);
the bottom surface of the reaction beam (1) is provided with a reaction rod limiting groove (10) matched with the top of the reaction rod;
both sides of the counter-force beam (1) are provided with screw rods (4), a counter-force beam bolt (3) is arranged between the screw rods (4) at both sides, and the counter-force beam is fixedly connected with the counter-force beam (1) through the counter-force beam bolt (3);
the screw (4) is uniformly provided with a plurality of connecting holes (2) along the axial direction of the screw (4), the counter-force beam (1) is arranged between the two screws (4) along the axial direction of the screw (4) in a moving way and is fixedly connected with the screw (4) through the counter-force beam bolt (3) and the connecting holes (2);
both sides of the steel rail (8) are provided with screw rods (4), and the counter-force beam (1) is fixedly connected with both screw rods (4);
the screw rod (4) is provided with a top plate nut (6) and a bottom plate bolt (9), and the top plate (5) and the bottom plate (7) are both positioned between the top plate nut (6) and the bottom plate bolt (9) and are fixedly connected with the screw rod (4) through the top plate nut (6) and the bottom plate bolt (9) respectively;
the bottom plate (7) is provided with a steel rail limiting groove matched with the bottom of the steel rail (8).
2. The counterforce device for the roadbed slab load test according to claim 1, characterized in that a plurality of counterforce rod limiting grooves (10) are evenly arranged on the bottom surface of the counterforce beam (1) along the length direction of the counterforce beam (1), and the counterforce rod limiting grooves (10) are positioned between the two screw rod supporting mechanisms.
3. A field test method for roadbed slab load test by using the counterforce device of any one of claims 1 to 2, characterized in that the method specifically comprises the following steps:
(1) determining an optimal measuring point position scheme by combining measuring point arrangement requirements of a roadbed flat plate load test and operation arrangement of a roadbed processing vehicle;
(2) assembling a counter-force beam (1), a screw rod (4) and a top plate (5) together and placing the counter-force beam, the screw rod and the top plate at a preset position on a steel rail (8);
(3) assembling a bottom plate (7) on a screw rod (4), then adjusting the height of a reaction beam (1), enabling the bottom surface of the reaction beam (1) to be in contact with the top of a reaction rod, and fixedly connecting the reaction beam (1) and the screw rod (4) together;
(4) pre-pressurizing to test the working state of the counterforce device, and then carrying out a roadbed slab load test;
(5) after the test of the measuring point is finished, the bottom plate (7) is dismantled, and the device is moved to the next measuring point;
(6) and (5) repeating the steps (3) to (5) until the test of all the test points is completed.
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| CN109267559B (en) * | 2018-11-06 | 2023-10-03 | 中铁六局集团有限公司 | Railway roadbed detection device |
| CN109932245A (en) * | 2019-04-18 | 2019-06-25 | 天津铁路信号有限责任公司 | A kind of rail pressure testing platform |
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