JPS598802A - Concrete paved slab track structure on soil foundation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete paved slab track structure on an earth roadbed for saving labor in maintenance of railway tracks.

Conventionally, labor-saving tracks developed for the purpose of laying on earth roadbeds include slab track RA type on earth roadbed, paved track, packed bed track, elastic sleeper track with bed, and bed frame type on earth road bed. There are tracks, filled-paved tracks, etc.

However, these tracks have poor running safety on high-speed railways,
They all have advantages and disadvantages in terms of subsidence characteristics, durability, economic efficiency, noise, vibration, maintenance, etc., and it is difficult to say that they are necessarily sufficient.

For example, the disadvantages include: (1) Since most of the above-mentioned tracks use asphalt threading material as the paving material or injection material, these materials have high temperature sensitivity and require consideration in terms of durability.

(j) Tracks with sleeper threads that use a trackbed tend to sink more than slab-based tracks, and even if a certain amount of maintenance is required, it is expected that the trackbed itself will sink, which reduces running safety. This requires further consideration.

(3) There are many tracks that have not yet been put into practical use due to economic efficiency, noise and vibration countermeasures.

The present invention aims to compensate for these shortcomings.
Embodiments of the present invention will be described in detail below with reference to the drawings.

Figures 1 (&), (b), and (Q) show a plan view, a vertical cross-sectional view, and a cross-sectional view of a concrete pavement slab track structure on an earth road base according to the present invention. 10
A reinforced roadbed g consisting of a granular crushed stone layer, a slag layer, a cement stabilization layer, an asphalt intermediate layer, or a combination thereof, which is often used in road pavement, is formed through the reinforcement roadbed g. A reinforced concrete pavement 3 having protrusions or t' that are particularly required in railway slab tracks is formed at regular intervals, and a precast concrete track-slab J is installed at a predetermined position on the pavement s, and the track slab 3 and A filler material q such as resin, cement asphalt or a mixture thereof is injected into the gaps of the concrete pavement j and allowed to solidify;
This structure supports the rail 1 on the track slab 3 via a rail fastening device.

In addition, for waterproofing and drainage purposes, the surface layer of the crushed stone top layer // that adjoins the concrete pavement is asphalt pavement 7.2, and the surface drainage is through drainage ditches /J, and holes are provided to collect water from the lower sand layer. Bury Huum's canal//l.

One of the advantages of the present invention is that, as the track slab 3, an already developed standard slab track that is commonly used on rigid roadbeds such as on elevated bridges, bridges, or inside tunnels can be consistently used.

That is, as shown in FIG. 1, track slabs 3 having a length of about 3ffi are installed sequentially in the longitudinal direction, and full-length protrusions 6 or semicircular protrusions 6' are installed at intervals of about 3 m to prevent them from moving in the horizontal direction. is placed.

Regarding the length of reinforced concrete pavement, tIO ~ 10
In addition to providing an expansion joint 7 every 0 m, a structure in which a contraction joint DA is provided every S-10 m is preferable, and Fig. 1 shows t.

This is an example in which contraction joints are provided every m. The thickness of the reinforced concrete pavement is SO~J0arn, and the width is different for Shinkansen and conventional lines, but it is 2.1~3. It may be about θm.

Furthermore, unlike roads, horizontal loads are applied to reinforced concrete pavements via rails, so there is a risk that the pavement may slide. To counter this, a frictional force between the reinforced roadbed and the reinforced roadbed is usually used, but if necessary, a key y can be provided on the underside of the pavement. FIG. 1(b) shows an example in which a key 6' is provided.

A static load test, a wheel axle drop test, and a dynamic load test were conducted on the concrete pavement on the earth road base constructed according to the present invention, and the following results were obtained.

The shape and dimensions of this pavement are length/Am x width 3. ttI
m×thickness 30111, the ground coefficient is r,, −,7~&
kg f/am”.

(1) In the static load test, the lateral displacement of each part of the track was 3.3% for the wheel load LTF. λ~7. Lambda plate, pavement roadbed
It was -0.04I to 0.0com.

(g) In the wheel axle drop test, the drop height was 20 mm and the track spring coefficient at the center (intermediate) section of the track slab was A J-
G,? tf/am, the damping coefficient is g 7~/JJk
gf-s/cm.

(3) In the dynamic load test, as a result of a repeated impact test of a total of 1 gal (corresponding to 0θ000 tons of core), the cumulative subsidence of the roadbed when the ground coefficient 'hs is approximately 3 kgf/am' was found. There was no cumulative subsidence of approximately nm+, K, ll, and ahgr/c-, and there were no abnormalities with the track other than that it performed better than other labor-saving tracks on earth roadbeds. -Yeah.

There wasn't.

From the above measurement results, the concrete pavement slab track on the earth road base constructed according to the present invention has a high load dispersion effect from the viewpoint of settlement characteristics because it is a reinforced concrete slab formed on a zero-reinforced road base. It has the advantage of less settling than other types of track, and from a durability standpoint, since it is made of concrete pavement, it has sufficient strength, is less sensitive to temperature than asphalt-based materials, and generally has a long service life. The results of the static load test and wheelset drop test confirmed that the track value was close to the measured value of conventional slab track yarn, and that there were no particular problems as a track.

In addition, concrete pavement is generally said to be 20 to 30% more expensive than asphalt pavement from an economical point of view for roads, but the overall cost considering the pavement's service life (first J2 project cost (10) maintenance and repair costs; (1) expenses and other expenses)
When considered from this point of view, it cannot necessarily be said that the building is in ruins. Also,
Although it may not be advantageous from the standpoint of noise and vibration, the track bounce coefficient is quite small due to the soft ground, and it is also possible to use anti-vibration slab tracks if necessary. Furthermore, from a maintenance perspective, slab tracks have already been constructed in large quantities and their effectiveness has been confirmed, and the slab tracks themselves are characterized by being relatively easy to repair.

Taking all of the above into account, it is believed that the concrete pavement slab track on an earth road bed according to the present invention is more useful than the conventional labor-saving track on an earth road bed.

[Brief explanation of the drawing]

Figure 1 (&) is a plan view of the concrete pavement slab track structure on earth roadbed according to the present invention, and Figure 1 (b) is Figure 1 (a).
A-A cross-sectional view of Figure 1 (0) is B-B of Figure 1 (a)
FIG. l...rail, co...rail tlllfN device, 3
...Precast concrete track slab, concrete...
Luminous layer, S-/Reinforced concrete pavement a, 4/
...Protrusion, 7.7'-...Joint, 1g...Reinforced roadbed, 9...Earth roadbed, lo...Sand layer, //--Crushed stone light layer, 1.2...Asphalt Pavement, 13...Drainage ditch, /lI-/Perforated pipe designated agent Megi National Railway President's Office Legal Affairs Department Sekiba Taishu

Claims (1)

[Claims] In railway tracks, a reinforced roadbed consisting of a granular crushed stone layer, a slurry layer, a cement stabilization layer, an asphalt intermediate layer, or a combination thereof, with a sand layer interposed on the earth roadbed. A reinforced concrete pavement with protrusions is formed on the reinforced roadbed, a precast concrete track slab is attached at a predetermined position M on the pavement, and a resin, cement asphalt, or a mixture thereof is applied to the gap between the track slab and the reinforced concrete pavement. A concrete pavement slab track structure on an earth roadbed, characterized in that a filler material such as the above is injected and fixed, and a rail is supported on the track slab via a rail fastening device.