Insulating reinforcement cage of trapezoidal sleeper for high-speed railway

Abstract

The utility model discloses an insulating steel reinforcement framework of a trapezoidal sleeper for a high-speed railway, which is characterized in that longitudinal grounding steel reinforcements are additionally arranged on the basis of prestressed steel strands and are connected with grounding terminals in a welding manner, and a whole grounding network is formed by connecting part of transverse steel reinforcements and the longitudinal grounding steel reinforcements. And insulating heat-shrinkable sleeves or insulating clamps are arranged at the intersections of the steel reinforcement frameworks in the trapezoidal sleeper, and the steel reinforcement frameworks are further fixed by binding insulating binding wires.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-speed railway track structures, mainly solves the insulation problem of a trapezoidal sleeper track and a track circuit, and specifically relates to a steel frame insulation structure of a trapezoidal sleeper laid on a ballastless track of a high-speed railway. Background Art

[0002] At present, domestic high-speed railways use the ZPW-2000 resonant non-insulated track circuit transmission system. The rails are used as signal return lines. The roadbed insulation will greatly reduce the eddy current impedance, reduce the energy loss of the return circuit, and ensure the transmission length of the signal.

[0003] The trapezoidal sleeper is a frame-type prestressed structure, which consists of longitudinal beams, connecting steel pipes, vibration-damping components and buffer components. The mutual inductance between the steel skeleton loop inside the longitudinal beam of the trapezoidal sleeper and the current passing through the rails will affect the transmission length of the resonant non-insulated track circuit. If no insulation treatment is performed, the transmission distance of the track circuit signal will be far from the standard requirements. In order not to affect the transmission of railway signals by the rails, the steel skeleton structure inside the longitudinal beam of the trapezoidal sleeper must have good insulation performance.

[0004] At present, there are two main ways to insulate the steel bars inside the track slab of a high-speed railway. One is to set an insulating card or insulating heat shrink tubing at the intersection of the steel bars, and the other is to use epoxy resin coated steel bars. However, the longitudinal beam of the trapezoidal sleeper is limited by the reinforcement space, and the longitudinal prestressed steel strand is the main force-bearing component. In order to prevent the influence on the prestressed steel strand, the longitudinal prestressed steel strand cannot be connected to the comprehensive grounding system. Therefore, insulation measures can only be set at the transverse steel bar position at the intersection of the longitudinal and transverse steel bars.

[0005] In addition, whether it is the insulating card or the insulating heat shrink tubing, the shrinkage coefficient of the material is quite different from that of the concrete material, and the insulating card or the insulating heat shrink tubing will occupy a larger area of ​​the trapezoidal sleeper longitudinal beam, reducing the bond strength between the steel bar and the concrete. All of the above will have an adverse effect on the durability of the structure; although the use of coated steel bars can avoid the source of cracks, it will lead to a decrease in the bond strength of the concrete, which will also affect the bearing capacity and durability of the concrete structure.

[0006] At present, the vibration-damping track types of high-speed railways are relatively simple. Based on the demand for the development of vibration-damping tracks with trapezoidal sleepers for high-speed railways, how to achieve insulation and grounding of sleepers within the limited reinforcement space is the top priority for the application of trapezoidal sleepers on high-speed railway tracks.

[0007] Based on the above problems, the inventors have conducted in-depth research on the steel skeleton structure and insulation scheme of the trapezoidal sleeper and the structural functions such as insulation grounding. Utility Model Content

[0008] In order to overcome the above-mentioned problems, the inventors have conducted intensive research and designed an insulating steel bar skeleton for trapezoidal sleepers for high-speed railways, in which longitudinal grounding steel bars are added to the prestressed steel strands and welded to the grounding terminals, and an overall grounding network is formed by connecting some transverse steel bars to the longitudinal grounding steel bars. Insulating heat shrink tubing or insulating cards are provided at the intersections of the steel bar skeletons in the trapezoidal sleepers, and the steel bar skeletons are further fixed by tying insulating binding wires, thereby completing the utility model.

[0009] Specifically, the purpose of the utility model is to provide an insulating steel bar skeleton for a trapezoidal sleeper for high-speed railways, the insulating steel bar skeleton comprising a plurality of prestressed steel strands 1 arranged along the length direction of the rail and transverse steel bars 2 arranged perpendicular thereto;

[0010] The insulating steel bar skeleton also includes longitudinal grounding steel bars 3 whose length and arrangement direction are consistent with the prestressed steel strands 1, and the longitudinal grounding steel bars 3 are welded and connected to the grounding terminals 4 located at the ends of the trapezoidal sleeper longitudinal beams;

[0011] In the single-sided longitudinal beam of the trapezoidal sleeper, the multiple prestressed steel strands 1 are arranged into at least two rows, and the longitudinal grounding steel bars 3 are at the same height as the prestressed steel strands 1 located above; in the horizontal direction, the longitudinal grounding steel bars 3 are located on the side close to the inner side, and there is only one prestressed steel strand 1 on the inner side.

[0012] Wherein, the longitudinal grounding steel bar 3 is round steel or galvanized flat steel.

[0013] The diameter of the round steel is above 16 mm and the cross-sectional area is 64 mm 2 above;

[0014] The cross-sectional area of ​​the prestressed steel strand 1 is 6.25πmm 2 Up to 25πmm 2 ;

[0015] When the longitudinal grounding steel bar 3 is a round steel bar, the transverse steel bar 2 in contact with the longitudinal grounding steel bar 3 is welded to the longitudinal grounding steel bar 3 via an L-shaped steel bar 5 .

[0016] When the longitudinal grounding steel bar 3 is a galvanized flat steel, the transverse steel bar 2 in contact with the longitudinal grounding steel bar 3 is a galvanized flat steel, and the longitudinal grounding steel bar 3 and the galvanized flat steel serving as the transverse steel bar 2 are connected by bolts 6 .

[0017] Wherein, the transverse reinforcement 2 is round steel or galvanized flat steel or SFCB reinforcement;

[0018] When the transverse reinforcement 2 is round steel, an insulating heat shrinkable sleeve or an insulating card is provided at the intersection between the transverse reinforcement 2 and the prestressed steel strand 1; and an insulating binding wire 7 is tied outside the insulating heat shrinkable sleeve;

[0019] When the transverse steel bar 2 is a galvanized flat steel, an insulating heat shrink sleeve or an insulating card is provided at the bolt connection between the transverse steel bar 2 and the galvanized flat steel as the longitudinal grounding steel bar 3; and an insulating binding wire 7 is tied outside the insulating heat shrink sleeve;

[0020] When the transverse reinforcement 2 is a SFCB reinforcement, an insulating binding wire 7 is tied at the intersection of the transverse reinforcement 2 and the prestressed steel strand 1 or the longitudinal grounding reinforcement 3 .

[0021] The surface of the grounding terminal 4 is flush with the end surface of the trapezoidal sleeper longitudinal beam.

[0022] The beneficial effects of the utility model include:

[0023] (1) According to the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway provided by the utility model, the trapezoidal sleeper obtained after the concrete pouring is completed has an effect on the rail resistance and rail inductance, which can meet the index requirements of the insulation technology in the high-speed railway;

[0024] (2) According to the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway provided by the utility model, insulation measures are arranged in the insulating steel bar skeleton, and the longitudinal grounding steel bars in the trapezoidal sleeper are connected to the comprehensive grounding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A top view of the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway of the present application is shown when the longitudinal grounding steel bar is round steel;

[0026] Figure 2 A cross-sectional view showing the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway of the present application when the longitudinal grounding steel bar is round steel;

[0027] Figure 3 A top view of a welded joint between longitudinal grounding steel bars and transverse steel bars is shown for an insulating steel bar skeleton of a trapezoidal sleeper for a high-speed railway of the present application when the longitudinal grounding steel bars are round steel bars;

[0028] Figure 4 A side view of a welded joint between longitudinal grounding steel bars and transverse steel bars is shown for an insulating steel bar skeleton of a trapezoidal sleeper for a high-speed railway of the present application when the longitudinal grounding steel bars are round steel bars;

[0029] Figure 5 A top view of the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway of the present application is shown when the longitudinal grounding steel bar is galvanized flat steel;

[0030] Figure 6 A cross-sectional view showing the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway of the present application when the longitudinal grounding steel bar is galvanized flat steel;

[0031] Figure 7 A top view of the bolt joint between the longitudinal grounding steel bars and the transverse steel bars of the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway of the present application is shown when the longitudinal grounding steel bars are galvanized flat steels;

[0032] Figure 8 A side view of a bolt joint between longitudinal grounding steel bars and transverse steel bars is shown when the longitudinal grounding steel bars of the insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway of the present application are galvanized flat steels;

[0033] Fig. 9 A schematic diagram showing the structure of the grounding terminal in the insulating steel reinforcement skeleton of the trapezoidal sleeper for high-speed railway of the present application;

[0034] Fig.10 A schematic diagram showing a system of longitudinal grounding steel bars, transverse steel bars, L-shaped welded steel bars and grounding terminals in an insulating steel bar skeleton of a trapezoidal sleeper for a high-speed railway of the present application;

[0035] Fig.11 A schematic diagram showing the structure of the invention when the transverse steel bar is round steel and an insulating heat shrink sleeve is arranged at the intersection and an insulating binding wire is tied

[0036] Fig.12 A schematic diagram showing the structure of tying insulating tying wires at the intersection when the transverse reinforcement is SFCB reinforcement;

[0037] Fig.13 A schematic structural diagram of the insulating steel bar skeleton end of a trapezoidal sleeper for high-speed railways is shown.

[0038] Description of Reference Numerals

[0039] 1- Prestressed steel strand

[0040] 2- Transverse reinforcement

[0041] 3-Longitudinal ground reinforcement

[0042] 4- Ground terminal

[0043] 5-L type steel bar

[0044] 6-Bolt

[0045] 7-Insulation binding wire DETAILED DESCRIPTION

[0046] The present invention is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more specific.

[0047] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0048] The utility model provides an insulating steel bar skeleton of a trapezoidal sleeper for high-speed railways, such as Figure 1 , Figure 5 and Fig.13 As shown in , the insulating steel bar skeleton includes a plurality of prestressed steel strands 1 arranged along the length direction of the rail and transverse steel bars 2 arranged perpendicular thereto;

[0049] The insulating steel bar skeleton also includes longitudinal grounding steel bars 3 whose length and arrangement direction are consistent with the prestressed steel strands 1, and the longitudinal grounding steel bars 3 are welded and connected to the grounding terminals 4 located at the ends of the trapezoidal sleeper longitudinal beams;

[0050] like Figure 2 and Figure 6 As shown in , in the single-side longitudinal beam of the trapezoidal sleeper, the plurality of prestressed steel strands 1 are arranged into at least two rows, and the longitudinal grounding reinforcement 3 is at the same height as the prestressed steel strand 1 located above; in the horizontal direction, the longitudinal grounding reinforcement 3 is located on the side close to the inner side, and there is only one prestressed steel strand 1 on the inner side, and the inner side is the side adjacent to each other between the two longitudinal beams of the trapezoidal sleeper. In the present application, by setting the longitudinal grounding reinforcement in the above-mentioned specific position, the overall strength of the longitudinal beam of the trapezoidal sleeper can be improved, and the stability and safety of the grounding line can be ensured.

[0051] Preferably in the present application, the prestressed steel strands 1 are provided with 18 strands, 9 strands at the top and 9 strands at the bottom; the transverse steel bars 2 are provided with 46 strands, the density near the connecting steel pipe is relatively large, the density at the edge of the trapezoidal sleeper end is relatively large, and the density at other positions is basically the same.

[0052] In a preferred embodiment, Figure 1 and Figure 5 As shown in , the longitudinal grounding steel bar 3 is round steel or galvanized flat steel.

[0053] Preferably, the diameter of the round steel is greater than 16 mm and the cross-sectional area is 64πmm. 2 above;

[0054] The cross-sectional dimensions of the galvanized flat steel are consistent with those of the round steel.

[0055] The cross-sectional size of the prestressed steel strand is smaller than that of the longitudinal grounding steel bar, and its diameter is generally 5-10 mm; the cross-sectional area of ​​the prestressed steel strand 1 is 6.25πmm2 Up to 25πmm 2 .

[0056] In the present application, the cross-sectional size of the longitudinal grounding steel bar 3 is set so that its cross-sectional size is much larger than the prestressed steel strand 1, so that the resistance on the longitudinal grounding steel bar 3 is much smaller than the resistance on the prestressed steel strand 1, thereby facilitating the current to be concentrated on the longitudinal grounding steel bar 3 and then conducted to the underground.

[0057] Preferably, when the longitudinal grounding steel bar 3 is a round steel bar, the transverse steel bar 2 in contact with the longitudinal grounding steel bar 3 is welded to the longitudinal grounding steel bar 3 through an L-shaped steel bar 5, such as Figure 3 and Figure 4 as shown in .

[0058] Preferably, when the longitudinal grounding steel bar 3 is a galvanized flat steel, the transverse steel bar 2 in contact with the longitudinal grounding steel bar 3 is a galvanized flat steel, and the longitudinal grounding steel bar 3 and the galvanized flat steel as the transverse steel bar 2 are connected by bolts 6, such as Figure 7 and Figure 8 as shown in .

[0059] Preferably in the present application, in order to ensure the welding quality of the grounding steel bars and the size of the steel bar skeleton, a welding jig of the longitudinal grounding steel bars (flat steel) needs to be set up and welded into shape on the jig; before welding the grounding terminal, the position of the grounding terminal needs to be located first, and after the grounding terminal is set up, the longitudinal and transverse steel bars can be laid out.

[0060] After the longitudinal grounding steel bars (flat steel) are welded or bolted to form a grounding system, they are placed in the trapezoidal sleeper production mold and positioned using the grounding terminal nut. The prestressed steel strands are then tensioned to form the steel skeleton structure of the trapezoidal sleeper.

[0061] In a preferred embodiment, the transverse reinforcement 2 is round steel or galvanized flat steel or SFCB reinforcement;

[0062] When the transverse reinforcement 2 is round steel, an insulating heat shrinkable sleeve or an insulating card is provided at the intersection between the transverse reinforcement 2 and the prestressed steel strand 1; and an insulating binding wire 7 is tied outside the insulating heat shrinkable sleeve;

[0063] When the transverse steel bar 2 is a galvanized flat steel, an insulating heat shrink sleeve or an insulating card is provided at the bolt connection between the transverse steel bar 2 and the galvanized flat steel as the longitudinal grounding steel bar 3; and an insulating binding wire 7 is tied outside the insulating heat shrink sleeve;

[0064] When the transverse reinforcement 2 is a SFCB reinforcement, an insulating binding wire 7 is tied at the intersection of the transverse reinforcement 2 and the prestressed steel strand 1 or the longitudinal grounding reinforcement 3 .

[0065] In the present application, the transverse reinforcement 2 in contact with the longitudinal grounding reinforcement 3 can be set as round steel or galvanized flat steel or SFCB reinforcement; the transverse reinforcement 2 not in contact with the longitudinal grounding reinforcement 3 is round steel or SFCB reinforcement.

[0066] In the present application, the SFCB bar refers to a steel-continuous fiber composite reinforcement bar.

[0067] Preferably, the surface of the grounding terminal 4 is flush with the inner end surface of the trapezoidal sleeper longitudinal beam, so as to facilitate connection with the ground wire and meet the requirements of the high-speed railway integrated grounding system.

[0068] In this application, after the trapezoidal sleeper steel frame structure is fixed, the insulation resistance test of the entire steel frame structure is required before concrete pouring. The intersection nodes of all longitudinal and transverse steel bars in the frame system must meet the requirement that the resistance is not less than 2MΩ. For nodes that do not meet the resistance requirements, insulating heat shrink tubing with notches or insulating pads can be used for insulation.

[0069] The inductance deviation of the rail impedance of a single trapezoidal sleeper shall not be greater than ±3%, and the AC resistance deviation shall not be greater than +15%.

[0070] After obtaining the insulating steel skeleton of the trapezoidal sleeper for high-speed railway, concrete is poured to obtain the trapezoidal sleeper. Then the insulation performance test of the trapezoidal sleeper is carried out: the tested trapezoidal sleeper is placed on a solid and flat ground; two rails are placed on the rail-bearing part of the trapezoidal sleeper, and the length of each rail extending out of the track plate at both ends should be the same. The rails are padded with insulating blocks (such as wooden pads) so that the height of the rail bottom from the rail-bearing surface is equal to the height of the fastener assembly, and the track gauge is adjusted to 1435mm±3mm. Use a connecting wire to seal the same end of the two rails by crimping with bolts with a diameter not greater than 10mm; insert the wiring terminal into the circular hole at the other end of the rail. The wiring terminal should be tightly connected to the rail and connected to the tester. Use a bridge tester to measure the inductance and resistance between the lead-out wiring terminals of the two rails. The test frequency is set to 2000Hz, and the measurement is performed 3 times. The arithmetic mean is taken as the test result of the first test. Remove the tested trapezoidal sleeper, place the rail on an insulating object (such as a wooden pad), make the height of the rail bottom from the ground the same as before the trapezoidal sleeper was removed, adjust the track gauge to 1435mm±3mm, and keep the other ends of the two rails sealed. Use the bridge tester again to measure the inductance and resistance between the two rail lead terminals. The test frequency is set at 2000Hz, measure 3 times, and take the arithmetic average as the test result of the second test.

[0071] The specific test results are shown in the table below:

[0072]

[0073]

[0074] The insulation test results of pure rails are shown in the following table:

[0075]

[0076] Through testing, the influence of trapezoidal sleepers on rail resistance and rail inductance was analyzed by taking the average value of three test results at a test frequency of 2000Hz. The deviation of the first scheme of the insulating steel reinforcement skeleton of trapezoidal sleepers for high-speed railways compared with the test values ​​of pure rails was ΔR of 2.90% and ΔH of -0.2%; the deviation of the second scheme compared with the test values ​​of pure rails was ΔR of 4.68% and ΔH of 1.76%; both can meet the insulation technical indicators.

[0077] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. An insulating steel bar skeleton for a trapezoidal sleeper for high-speed railway, characterized in that: The insulating steel bar skeleton comprises a plurality of prestressed steel strands (1) arranged along the length direction of the rail and transverse steel bars (2) arranged perpendicular thereto; The insulating steel bar skeleton also includes longitudinal grounding steel bars (3) whose length and arrangement direction are consistent with those of the prestressed steel strands (1); the longitudinal grounding steel bars (3) are welded to grounding terminals (4) located at the ends of the trapezoidal sleeper longitudinal beams; The cross-sectional area of ​​the prestressed steel strand (1) is 6.25πmm 2 Up to 25πmm 2 ; The longitudinal grounding steel bar (3) is round steel or galvanized flat steel with a cross-sectional area of ​​64πmm 2 above; In the single-sided longitudinal beam of the trapezoidal sleeper, the plurality of prestressed steel strands (1) are arranged into at least two rows, one above the other, and the longitudinal grounding steel bars (3) are at the same height as the prestressed steel strands (1) located above; in the horizontal direction, the longitudinal grounding steel bars (3) are located on a side close to the inner side, and there is only one prestressed steel strand (1) on the inner side.

2. The insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway according to claim 1, characterized in that: When the longitudinal grounding steel bar (3) is a round steel bar, the transverse steel bar (2) in contact with the longitudinal grounding steel bar (3) is welded to the longitudinal grounding steel bar (3) via an L-shaped steel bar (5).

3. The insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway according to claim 1, characterized in that: When the longitudinal grounding steel bar (3) is a galvanized flat steel bar, the transverse steel bar (2) in contact with the longitudinal grounding steel bar (3) is a galvanized flat steel bar, and the longitudinal grounding steel bar (3) and the galvanized flat steel bar serving as the transverse steel bar (2) are connected by bolts (6).

4. The insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway according to claim 1, characterized in that: The transverse steel bars (2) are round steel bars or galvanized flat steel bars or SFCB bars; When the transverse steel bar (2) is round steel, an insulating heat shrinkable sleeve or an insulating card is provided at the intersection between the transverse steel bar (2) and the prestressed steel strand (1); and an insulating binding wire (7) is tied outside the insulating heat shrinkable sleeve; When the transverse steel bar (2) is a galvanized flat steel, an insulating heat shrink sleeve or an insulating card is provided at the bolt connection between the transverse steel bar (2) and the galvanized flat steel as the longitudinal grounding steel bar (3); and an insulating binding wire (7) is tied to the outside of the insulating heat shrink sleeve; When the transverse reinforcement (2) is a SFCB reinforcement, an insulating binding wire (7) is tied at the intersection of the transverse reinforcement (2) and the prestressed steel strand (1) or the longitudinal grounding reinforcement (3).

5. The insulating steel bar skeleton of the trapezoidal sleeper for high-speed railway according to claim 1, characterized in that: The surface of the grounding terminal (4) is flush with the end surface of the trapezoidal sleeper longitudinal beam.

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