JPS5949368B2 - How to connect to the direct underground track - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for switching and connecting an existing ground track located directly above an end of a new underground track constructed directly below an existing ground or road track.

In recent years, due to deteriorating road conditions at level crossings and noise pollution problems, existing above-ground tracks (hereinafter simply referred to as above-ground tracks) have been
now turns into an underground orbit.

Construction of new underground track (hereinafter simply referred to as underground track)
The parts excluding the connection with the above-ground track could be constructed using conventional techniques such as open-cut construction method and shield construction method without causing any hindrance to train operation on the above-ground track. At connection points, it is difficult to complete the switching work, such as removal of above-ground tracks, roadbed maintenance and track laying at underground connection points, without interfering with train operation, that is, between the last train and the first train. there were.

Conventionally, therefore, switching work has been carried out by making considerable sacrifices by installing a temporary track that is equal to or longer than the length of the connection section on the side of the above-ground track, and allowing trains to operate on this temporary track. It's here.

The present invention solves the above-mentioned drawbacks of the conventional technology and is a method of connecting to an underground track directly below the ground track, which can connect the ground track and the underground track directly below it overnight.

What is shown in FIG. 1 is a side view of a track including a section in which the above-ground track is connected to a direct underground track according to the present invention, and numeral 10 shown in the figure is the existing above-ground track, and the part indicated by 11 is the remaining part of the existing ground track, and section C is:
When the jacking down is applied to the b section, the structure part trajectory decreases along with the Kb section, and the b section is the section where the jacking down is applied.

In section C, the ground track is supported by temporary track girders.
This is a section in which the underground track 19 is provided directly below using an open cut construction method or the like, and then both the track temporary support girder and the surface track 12 on the track temporary support girder are removed at the time of connection.

Section C is a section in which a connection gradient track 19 is laid directly below the removed ground track 12.

Section d is the newly constructed underground track section 1 directly below the surface track 13.
It is 4.

First, we will describe the connection preparation work for the ayb section, which is the descending portion of the connection section.

When the construction girder 30 with sleepers is installed to jack down the ground track 11 in section a + b shown in Fig. 1, the temporary abutment 36 to support the construction girder 30 is installed (see Fig. 2). A thick corner etc. will be laid on both sides of the ground track in sections a and b.

The sleeper-embedded construction girder 30 is, as shown in FIG.
Consisting of sleepers 31 for track temporary support (hereinafter referred to as sleepers) and a main girder 32, both ends of the sleeper 31 are fixed with channel steel 33, the main girder 32 is made of H-shaped steel, and the sleepers are attached to the H-shaped steel of the main girder. A mounting piece 34 for fixing the channel steel 33 is welded in advance.

The sleepers 31 are constructed by digging up the gravel of the ground track 11 and laying them there at predetermined intervals.

The main girder 32 of the sleeper-embedded construction girder 30 constructed as described above is used as a joint structure 38 (see FIG. 6) to form an integral continuous beam in the track direction as shown in FIG. 2.

Next, cast-in-place foundation piles 15 are driven at appropriate intervals along both sides of the ground track outside the main girder 32 (see Figure 2), and if the track is double track, intermediate support piles 15 are placed between the tracks. (
5), trench excavation 39 is performed as shown in FIG. 8, and a cross beam 35 for track temporary support is passed under the main girder 32, and with this cross beam 35, as shown in FIG. The opposing foundation piles 15 and the intermediate support piles 16 are connected and fixed.

(This cross beam 35 is to be removed when the jack gantry 20 described later is assembled.

) ``In this way, after supporting the retractable construction girder 30 on which the above-ground track 11 is mounted by the cross beam 35 for temporary track support, the underground continuous wall 55 (
(see Figure 5), and is used as an earth retaining wall when constructing the connection slope bottom plate part that supports the ground track that is lowered by jacking down.

Once the underground continuous wall 55 is completed, a space is excavated between the opposing underground continuous walls 55 immediately below the jack-down ground track 11 to create a cavity, and then concrete for the connection slope bottom plate portion 56 is poured.

Thereafter, as shown in FIGS. 5 and 6, the jack gantry 20 is assembled on the concrete of the connecting slope bottom plate part 56, facing across the track.

The jack gantry forms a framework with a gantry support 21 and a rod gantry 22, a load equalizer 23 is provided on the rod gantry 22, and a center hole type hydraulic jack 25 is assembled into the hanging gantry 20 with a step rod 24.

When the assembly of the jack gantry 20 is completed in this way,
Cross the construction girder support cross girder 37 to the opposing jack gantry 20
is attached to support the sleeper-embedded construction girder 30.

At this time, the intermediate support piles 16 of the track temporary support cross beams 35 shown in FIG. 5, which were supporting the sleeper-embedded construction girders 30, are removed.

At this time, an intermediate temporary vent 17 may be provided in place of the intermediate support pile to be removed.

(Refer to Figures 5 and 6.) Next, we will talk about Section C (Figure 1, 7), which is the removed ground track section below which the connecting slope track will be laid. As shown in the figure, track temporary support girders 40 for jacking up are provided so that the track 12 in section C can be lifted.

This jack-up track temporary support girder 40 is made up of sleepers 41 and main girders 42, and is supported by track temporary support cross beams 45, similar to the girders provided in the jack-down section.

The foundation piles 15 that support the track temporary support cross beams 45 are cast on site as in the case of section b, and after the foundation piles 15 support the track 12 via the track temporary support girders 40,
In parallel with this, an underground continuous wall 55 is constructed between the mutual foundation piles.

Then, a portion directly below the track 12 is excavated between the opposing underground continuous walls 55, a concrete bottom plate 54 is laid for laying the directly connected slope track 19, and track bed preparation such as laying sleepers is performed on this. A directly connecting gradient track 19 will be installed.

On the other hand, at appropriate positions on the foundation pile 15 and the underground continuous wall 55, there is installed a patented load-up device 28, which is characterized by a basic structure and a jack gantry in a section including a load equalizer 23 and a center-hole hydraulic jack 25, as shown in Fig. 7 (left half). ), and the device 28 and the track temporary support cross beam 45 are connected by a jacking jig 29, so that the track can be jacked up as necessary.

When preparations for jacking down section B and preparations for underground track 19 maintenance and removal of surface track 12 in section C are completed as described above, connection work is carried out as follows.

In section C, which is the construction section, gravel and sleepers are removed so that it can be similar to the jacking down of section B track 13.

In section b of jacking down, first remove the temporary vent 17, and use the center hole type hydraulic jack 25 to lower the retractable construction girder 30, which is supported via the construction girder support cross girder 37.
is jacked down together with the track 11 to a predetermined position as shown in Fig. 6, and after connecting its terminal to the connecting slope track 19 directly below section C, the sleeper-embedding type work is carried out via the support girder 26 or sandle. The girder 30 is temporarily fixed to the jack gantry 20, and then roadbed maintenance such as embankment and crushed stone scattering is carried out between the sleepers 31 and the concrete of the connection slope bottom plate 56, and the jacked-down surface track 13 of section b is converted into an underground track. Let it be the connecting orbit to.

After that, the support girder 26 and the jack gantry 20 are removed, and the work in section b is completed.

On the other hand, the removed ground track 12 in section C, which is supported by the track temporary support cross beam 45 via the track temporary support girder 40, is temporarily raised to the required height by the jacking up device 28, as shown in FIG. 7 (left half). After pushing up the support crossbeam 45, a bogie 52 running on the simple rail 51 on the underground continuous wall 55 is inserted below the pushed up track temporary support crossbeam 45', as shown in FIG.
The above-mentioned track temporary support cross beam 45' on which the C section ground track 12 is placed is placed on the trolley 52 with the sandals 53 etc. mounted (the procedure is shown from the left half to the left half in FIG. 8), and as shown in FIG. The train is removed by appropriate means onto the ground track 13 in section d shown in
+ Pass through the jacked-down track 18 in section b, pass through the directly connecting slope track 19 in section C, and then connect to the underground track 1 in section d.
Ground track 12 in section C, which is an obstacle to entering 4.
is removed, and the connection work between the surface track 10 and the underground track 14 is completed.

As described above, the present invention provides a direct connection gradient track of a required length to be connected to the new underground track 14 among the new tracks that connect the above ground track 10 with the new underground track 14 constructed directly below the existing ground track 13. 19 section is laid directly below the removed ground track 12, and a connecting slope bottom plate part 56 is provided directly below the ground track 11, which is the descending part of the ground track 10 of the new track.
lowering the existing ground track 11, which is the descending portion directly above the connection slope bottom plate part 56, to the connection slope bottom plate part 56 by an appropriate method and connecting it to the connection slope track 19 directly below;
A method for connecting to a direct underground track 14, characterized in that the existing track 12 directly above the direct connection gradient track 19 portion is placed on a bogie and then removed. After supporting the track temporary support sleepers 31 and the construction support cross beams 37 that support the sleepers with jacks on the existing ground track 11 directly above the bottom plate portion 56, a method is adopted in which the tracks are jacked down and lowered, and Railroad sleepers 3 for temporary support for the track are installed on the existing track 12 directly above the connecting gradient track 19.
1 and the track temporary support cross beam 45 that supports the sleeper, he decided to jack it up to only 7 rims, place it on the trolley 52 on the underground continuous wall 55, and then remove it. Therefore, both the above-ground track 10 and the new underground track 1 directly below were completed in one night without requiring any siding land or disrupting train schedules.
4 can be connected.

In addition, the total length of the construction section when implementing the method of connecting to the direct underground track according to the present invention, and the connection slope bottom plate portion 1 within it.
8 and the connecting slope track portion 19 are arranged in length such that the ground track 1
It is determined by taking into account the altitude difference between 0 and the underground orbit 14, the topography, etc.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the above-ground underground track including the connection section to the direct underground track, Figures 2 to 4 are cross-sectional views of the steps of the sleeper-embedding girder construction method, and Figure 5 is the track of the jack-down method. FIG. 6 is a vertical cross-sectional view in the direction perpendicular to the track, FIG.
The figure shows a vertical cross-sectional view of the jacked-up track after removal. 10... Ground track, 11... Jacked down section ground track, 12... Removed section ground track, 13... Ground track directly above underground track, 14... Underground track, 18... Jacked down connection track , 19... Connection track under the removed section, 15... Foundation pile, 16... Intermediate support pile, 1
7... Intermediate plate vent, 18... Connection slope bottom plate part,
19... Directly connecting slope track, 20... Jacket gantry, 21... Gantry support, 22... Rod gantry, 23...
...Load equalizer, 24...step rod,
25... Center hole type hydraulic jack, 26...
Support girder, 27... Jacketing device, 28... Jacketing up jig, 30... Sleeper hugging construction technique, 31...
・Track temporary support sleeper, 32... Main girder, 35... Track temporary support cross beam, 36... Temporary abutment, 37... Construction support cross beam, 3
8... Trench, 40... Track temporary support girder for jacking up, 41... Sleeper, 42... Main girder, 45... Track temporary support cross girder, 51... Rail for construction truck, 52 ... Bogie, 53 ... Sandle, 54 ... Concrete bottom plate for directly connected slope track, 55 ... Underground continuous wall, 56 ...
・Connection slope bottom plate part.

Claims (1)

[Scope of Claims] 1. Of the new track that connects the new underground track constructed directly below the existing ground track and the above-ground track, the required length of the directly connected slope track that is connected to the new underground track is removed and the above-ground track is removed. After installing a connecting slope bottom plate directly below the ground track, which is the descending part of the existing ground track that is connected to the connecting slope track directly below the new track, a descending part directly above the connecting slope bottom plate. The work of lowering the existing ground track onto the connecting slope bottom plate part using an appropriate method and connecting it to the directly below slope track, and the work of placing the existing track directly above the directly below connecting slope track part on a trolley and then removing it. A method for connecting to a direct underground track, characterized by implementing the following. 2. After supporting the track temporary support sleeper and the construction girder support cross girder that supports the sleeper with jacks on the existing ground track of the descending part directly above the connection slope bottom plate part, jack down the existing ground track of the descending part. A method of connecting to the direct underground orbit as described in paragraph 1 above. 3 Removal directly above the directly connected slope track After the existing track is supported with a jack, the track temporary support cross girder supporting the track temporary support sleeper is supported with jacks, and then the track is jacked up slightly and placed on a trolley of underground continuous wall soil. , the connection method to the direct underground track described in paragraph 1, which is then removed.