JP2019094616A - Roadbed improvement method - Google Patents

Abstract

To provide a roadbed improvement method that has good workability and can improve a roadbed of a railroad suitably while enlarging a construction area.SOLUTION: A roadbed improvement method comprises: a ballast removal/existing roadbed exposure step of removing existing ballast and exposing an existing roadbed 5; an existing roadbed excavation step of excavating the roadbed 5 and forming a recess 6 in a construction area; a crushed stone packing step of packing crushed stone 7 in the recess 6 by laying the crushed stone and forming a packed crushed stone layer 13; a grout material packing step of injecting and packing a grout material 16 in the packed crushed stone layer 13; and an inlet and confirmation port exposure formation means installation step of installing, at the grout material packing step, inlet and confirmation port exposure formation means for exposing and forming an inlet 14 in which the grout material 16 is injected and a packing confirmation port 15 for confirming a packing state of the grout material 16 each in the packed crushed stone layer 13.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a roadbed improvement method for improving a railway roadbed.

  Conventionally, replacement methods and cement stabilization methods have been widely used as methods for improving roadbeds.

  The replacement method is a method to replace the soft roadbed with a good quality roadbed material (Railway design etc. Design standard / explanation A group material described in the soil structure, particle size control crushed stone, crusher run etc.) and improve the roadbed rigidity. It is important to fully compact (more than 95% compacting degree) with a compacting machine / compaction machine such as a plate rammer or a typing rammer at the time of replacement work with a high quality base material.

  The cement stabilization method is a method to improve the stiffness of the roadbed by adding and mixing cement to a soft roadbed or particle size control crushed stone and crusher, etc. As with the replacement method, it is sufficient by the compaction machine / rolling machine It is important to In addition, there may be used a material obtained by mixing a high quality roadbed material such as particle size control crushed stone or crusher and cement.

  Thus, the replacement method and the cement stabilization method require sufficient compaction, for example, the improvement of the track base of the railway track where work is required to be performed within the limited time of the first train from the last power, in other words It is rarely used in the field.

  In response to this, the applicant of the present application has conducted research on a grout-filled roadbed base improvement method that can be simply and quickly constructed as a roadbed base improvement method for railways, and a result construction method has been proposed and put to practical use (for example, Non-Patent Document 1).

  In this grout-filled roadbed improvement method, the roadbed in the construction area of the roadbed improvement is excavated and removed, the excavated area is covered with crushed stone such as ballast, and the gap between the crushed crushed stone is filled with grout material to construct a roadbed improved layer Do.

  According to this, by filling the grout material and curing it, it becomes possible to eliminate the need for the compaction operation required in the conventional roadbed improvement method and to construct a uniform rigid layer. In addition, if the generated ballast is used for the crushed stone to be laid, environmental load can be reduced, and if a new ballast (crushed stone) is used, the construction speed can be improved.

Takahisa Nakamura, Naosuke Momoya, Miki Ito, Katsumi Muramoto: "Development of an existing track improvement method using generated ballast", Research Report of Railway General Research Institute, Research Report (RTRI REPORT) Vol. 27, No. 4, April 2013

  On the other hand, in the above-mentioned conventional grout-filled roadbed improvement method, excavating the roadbed, laying the ballast, filling the grout material to construct the roadbed improved layer, and re-establishing the roadbed ballast and sleeper on the constructed roadbed improved layer. A series of installation work needs to be performed within a limited time between, for example, the last power and the last power. Therefore, it is difficult to take a large construction area (construction section), and there is room for improvement in this respect.

  In other words, since the above-described conventional grout-filled roadbed improvement method is suitable for spot-like construction, it has been strongly desired to be able to apply it even if the construction section is 50 m or more, for example.

  In view of the above circumstances, the present invention has an object to provide a roadbed improvement construction method which is excellent in workability and enables a roadbed improvement of a railway to be suitably performed by enlarging a construction area.

  In order to achieve the above object, the present invention provides the following means.

  The roadbed improvement method of the present invention is a method for improving the roadbed of a railway, and the roadbed ballast removing / existing roadbed exposing step for removing the existing roadbed ballast and exposing the existing roadbed and excavating the roadbed The existing roadbed excavating step of forming a recess in the construction area, the crushed stone filling step of filling and filling the crushed stone in the concave portion to form a filled crushed stone layer, and the grout material injecting and filling the filled crushed stone layer with grout material Forming an filling port for injecting the grout material when performing the grouting material filling process, and a filling confirmation port for confirming the filling condition of the grout material in the filling crushed stone layer. The method further comprises the steps of installing an inlet / confirmation port exposure forming means for installing an injection port / confirmation port exposure forming means for exposing.

  In the base course improvement method of the present invention, a crushed stone filled bag body filled with crushed stone in a bag body is used as the injection port and confirmation port exposure forming means, and the crushed stone is spread and filled in the recess and the crushed stone filled bag Preferably, the body is disposed in the recess and the injection port and the filling confirmation port are exposed and formed by removing the crushed stone filling bag body when performing the grout filling process.

  In the base course improvement method of the present invention, in the injection port / confirmation port exposure forming means installation step, the injection port exposure forming means among the injection port / confirmation port exposure forming means is one end of the filled crushed stone layer in plan view. It may be installed in a portion, and the confirmation port exposure forming means among the injection port / confirmation port exposure forming means may be installed at the other end of the filled crushed stone layer in plan view.

  In the roadbed improvement method according to the present invention, a grout injection port and a filling are formed when a roadbed is excavated and removed and a recess formed in a construction area for road improvement is filled with crushed stone such as ballast to form a filled crushed stone layer. By providing the injection port and the confirmation port exposure forming means for forming and exposing the confirmation port, it becomes possible to perform the filling operation of the grout material to the packed crushed stone layer (recess) at any timing.

  In this way, track ballast removal / existing roadbed exposure process, existing roadbed excavation process, crushed stone filling process, injection port / confirmation port exposure forming means installation process, track recovery process, for example, between the last train and the first train The operation can be resumed, and at a later date, the inlet / filling confirmation hole forming step, the grout filling step, and the track ballast laying step can be performed between the last turn and the turn-on to complete the base block improvement work in the construction area.

  Therefore, according to the roadbed improvement method of the present invention, it is not necessary to complete all the steps of construction within a limited time, and all steps can be divided and advanced stepwise, and all steps of construction are limited. Compared with the conventional roadbed improvement method that needs to be performed within a short time, it is possible to set a large construction area. Therefore, it becomes possible to aim at improvement of construction nature, and cost reduction of road base improvement construction.

In the base course improvement method concerning one embodiment of the present invention, it is a figure showing the state where the roadbed ballast was removed and the existing base course was exposed. The roadbed improvement construction method which concerns on one Embodiment of this invention WHEREIN: It is a figure which shows the state which excavated the existing roadbed and formed the recess. The roadbed improvement construction method which concerns on one Embodiment of this invention WHEREIN: It is a figure which shows the state which filled the recess with crushed stone and formed the filled crushed stone layer. The roadbed improvement construction method concerning one embodiment of the present invention is a figure showing the state where a crushed stone was filled in a recess and a crushed stone filled bag body of an injection port and confirmation port exposure formation means was installed in a recess. In the base course improvement construction method concerning one embodiment of the present invention, it is a figure showing the state where a ballast was installed on a filling crushed stone layer and a crushed stone filling bag body of injection port and confirmation port exposure formation means was installed. In the base course improvement method according to one embodiment of the present invention, it is shown that the ballast operation is performed on the packed crushed stone layer and the railway operation is resumed with the crushed stone filled bag body of the inlet / outlet opening forming means installed. FIG. In the base course improvement method according to an embodiment of the present invention, the crushed stone filled bag body of the inlet / confirmation port exposure forming means is removed to form a grout material inlet and a filling confirmation port, and a diagram showing the exposed state. is there. The roadbed improvement construction method concerning one embodiment of the present invention WHEREIN: It is a figure which shows the state which is filling grout material in a filling crushed stone layer and a recess. The roadbed improvement construction method concerning one embodiment of the present invention WHEREIN: It is a figure which shows the state which is filling grout material in a filling crushed stone layer and a recess. The roadbed improvement construction method concerning one embodiment of the present invention WHEREIN: It is a figure which shows the state which is filling grout material in a filling crushed stone layer and a recess. The roadbed improvement construction method concerning one embodiment of the present invention WHEREIN: It is a figure which shows the state which filled the filling crushed stone layer and the recess with the grout material. In the base course improvement method concerning one embodiment of the present invention, it is a figure showing the state where base course improvement was completed. In the base course improvement method concerning one embodiment of the present invention, it is a figure showing the example of change of a pouring opening and confirmation opening exposure formation means. It is a top view of FIG.

  Hereinafter, with reference to FIGS. 1-12, the road-base improvement construction method which concerns on one Embodiment of this invention is demonstrated. Here, this embodiment excavates and removes the roadbed in the construction area of roadbed improvement, lays up crushed stone such as ballast in the excavated area, and fills grout material in the space of the laid crushed stone to construct a roadbed improved layer It relates to the roadbed improvement method for railways.

  Specifically, in the roadbed improvement method of the present embodiment, as shown in FIG. 1, the sleepers 1 and the rails 2 in the construction area (construction section) are temporarily supported using support means as appropriate, and construction machines such as backhoes 3 Temporarily place the existing roadbed ballast 4 outside the construction area. Thereby, the existing roadbed 5 to be improved is exposed (roadbed ballast removal / existing roadbed exposure step).

  Next, as shown in FIG. 2, the roadbed 5 in the construction area exposed by removing the ballast 4 is excavated to a predetermined width (for example 3 m) and a predetermined depth (for example 30 cm) and recessed all over the construction area Station 6 (existing roadbed excavation process).

  Next, as shown in FIG. 3, crushed stones 7 such as, for example, a generated ballast 4 and a new ballast are laid in the recess 6 and filled (crushed stone filling step). At this time, for example, the crushed stone 7 is divided into a plurality of layers (multistage: for example, two layers of 15 cm thick in this embodiment) from the bottom 6a side of the recess 6 and a plate is provided each time the crushed stone 7 of each layer is laid. Firmly compact using a compactor / rolling machine 8 such as a rammer.

  Further, in the roadbed improvement method of the present embodiment, as shown in FIG. 4, when laying the crushed stone 7 in the upper layer in the recess 6, a crushed stone filled bag in which a bag body such as sandbag is filled with crushed stone 7 such as ballast. Place the body 9 in a part of the upper layer, fill the other part with the crushed stone 7 as it is, lay the crushed stone in the upper layer, and carry out rolling pressure (First crushed stone filled bag body laying process / inlet and confirmation port exposure forming means installed Process).

  The crushed stone filling bag 9 is a means for forming an injection port and a confirmation port for forming and exposing a grout material inlet and a grout material filling confirmation port when performing a grout material filling process in a later step.

  In the present embodiment, the crushed stone-filled bag body 9 is laid on both widthwise end portions of the recess 6 and the central portion. In addition, the crushed stone filling bag body 9 in the central part is disposed adjacent to each other in the track direction and is disposed between the side walls 1, and the crushed stone filling bag body 9 on both ends in the width direction is appropriately It arranges at intervals of about 5m-10m. In addition, when filling of the grout material is confirmed to the lower surface position of the crushed stone filling bag body 9 at the time of filling of the grout material described later, ballast (crushed stone) is put into the arrangement portion (injection port and filling confirmation port), and grout again Fill the material. In this way, when the grout material is filled, the grout material can be filled at a position lower than the crushed stone filling position of the recess 6, and the filling can be performed in consideration of the overflow. That is, when it is confirmed that the grout material is filled with the grout material to the lower surface position of the crushed stone filling bag body 9, ballast is charged into the arrangement portion (the inlet and the filling confirmation port) and the grout material is filled again. The grout material can be filled with high accuracy up to the height at which the filling bag 9 is disposed.

  Next, as shown in FIG. 5, a crushed stone filled bag body 10 is stacked above the crushed stone filled bag body 9 laid in the recess 6 as a temporary support and an inlet / outlet opening forming means (second crushed stone filled bag Between the laying of crushed stone bags 11 formed by stacking the crushed stone filled bags 10 for temporary support, and a ballast 12 such as a new ballast etc. Lay down. At the same time, the temporary support state by the support means is released, and the sleeper 1 in the construction area is supported by the newly re-layed ballast 12 for laying. In addition, the rail 2 is connected to the laid sleeper 1 (track recovery process).

  As a result, as shown in FIG. 6, in the construction area, the roadbed becomes thicker by the amount of crushed stone 7 filled in the recess 6, and the operation of the railcar 20 can be resumed (railroad operation restart process). That is, if the work from the removal of the existing ballast described above to the work of laying the ballast anew is performed, for example, from the last power to the power delivery, the operation of the railway vehicle 20 is not hindered by the road improvement work.

  Next, the railway operation is normally performed in the above-mentioned railway track condition, for example, when the final power is cut off and the road improvement work is resumed again, as shown in FIG. And the crushed stone-filled bag body 9 laid in the recess 6 is removed to expose each layer of the filled crushed stone layer 13 in the recess 6. At this time, since the crushed stone filling bags 9 and 10 are filled with crushed stones 7 such as ballast in bags such as sandbags, the broken bags 9 and 10 are removed by manually pulling up the bag portion and holding the bag portion. can do.

  Then, the filled crushed stone layer 13 is exposed at a plurality of locations in the construction area, and the exposed surfaces of the plurality of filled crushed stone layers 13 are used as the inlet 14 for grout material and the filling confirmation port 15 for grout material (inlet / filling confirmation port Formation process).

  Next, as shown in FIGS. 8 and 9, a cement-based grout material (a two-component liquid using a liquid A, a liquid B, and a liquid of suspension type) 16 having a gel time is filled from the injection port 14 The bottom layer of the crushed stone layer 13 is filled. At this time, filling control of the grout material 16 is performed by confirming leakage of the grout material 16 from the filling confirmation opening 15 of the lowermost layer of the filled crushed stone layer 13. In addition, as the cement-based grout material 16, it is preferable to use a grout material having, for example, a gel time of about 2 to 5 minutes (a time until the fluidity of the grout material significantly decreases).

  As shown in FIGS. 10 and 11, after the lowermost layer of the packed crushed stone layer 13 is filled with the grout material 16, the grout material 16 is sequentially injected and filled in the upper layer in the same manner as the lowermost layer. At this time, crushed stone 7 is filled in each layer so as to form the filling confirmation port 15 and the injection port 14 appropriately in the space in the recess 6 formed by removing the crushed stone filled bag body 9 (grout material filled Process).

  Then, after the grouting material 16 is injected and filled in all of the filled crushed stone layer 13, that is, the entire recess 6, to form the base improvement section 17, as shown in FIG. 10 is removed, and a ballast 12 is newly laid on the portion of the crushed stone-filled bag body 10 or the like which has been removed, and is backfilled (roadbed ballast laying step). The crushed stone-filled bag body 10 may be left to form a track bed track.

  Therefore, in the roadbed improvement method of the present embodiment, when the roadbed 5 is excavated and removed and the crushed stone 7 such as a ballast is spread in the recess 6 formed in the installation area of the roadbed improvement to form the filled crushed stone layer 13 Filling the grout material 16 into the crushed crushed stone layer 13 (recess 6) by providing the inlet / confirmation port exposure forming means 9 for forming and exposing the injection port 14 and the filling confirmation port 15 of the grout material 16 Can be performed at any time.

  In this way, track ballast removal / existing roadbed exposure process, existing roadbed excavation process, crushed stone filling process, injection port / confirmation port exposure forming means installation process, track recovery process, for example, between the last train and the first train The operation can be resumed, and at a later date, the inlet / filling confirmation hole forming step, the grout filling step, and the track ballast laying step can be performed between the last turn and the turn-on to complete the base block improvement work in the construction area.

  That is, in the roadbed improvement method of the present embodiment, it is not necessary to complete all the steps of construction within a limited time, and it becomes possible to divide all the steps and proceed stepwise.

  Therefore, according to the roadbed improvement method of the present embodiment, the construction area can be set larger compared to the conventional roadbed improvement method which requires that all the steps of the construction be performed within a limited time, and the workability And cost reduction of road improvement work.

  As mentioned above, although one Embodiment of the road-base improvement construction method which concerns on this invention was described, this invention is not limited to said one embodiment, It can change suitably in the range which does not deviate from the meaning.

  For example, in the present embodiment, the injection port / confirmation port exposure forming means for forming and exposing the injection port 14 and the filling confirmation port 15 of the grout material 16 is the crushed stone filling bags 9 and 10, but There is no need to limit it to For example, as shown in FIG. 13, the crushed stone 7 is placed and filled in the recess 6 in the crushed stone filling process, and the injection pipe 18 and the confirmation pipe 19 as the injection port / confirmation port exposure forming means are recessed 6 The other end side is placed outside and installed while inserting one end side (inlet and confirmation port exposure forming means installation step), the inlet 14 of the grout material 16 by the injection pipe 18 and the confirmation pipe 19, The filling confirmation port 15 may be formed and exposed. In this case, the injection of the grout material 16 and the filling confirmation management can be performed using the injection pipe 18 and the confirmation pipe 19, and it is possible to obtain the same function and effect as the present embodiment.

  FIG. 14 is a plan view of FIG. In the injection port / confirmation port exposure forming means installation step described above, the injection pipe 18 as the injection port exposure forming means is installed at one end of the crushed crushed stone layer 13 in plan view, and the confirmation pipe as the inspection port exposure forming means The end confirmation pipe 191 (a first end confirmation pipe 191a and a second end confirmation pipe 191b) among the parts 19 is installed at the other end of the packed crushed stone layer 13 in plan view. The injection pipe 18 and the end confirmation pipe 191 are disposed on opposite sides of the pair of rails 2. The packed crushed stone layer 13 formed inside the recess 6 extends along the extending direction of the rail 2. The injection pipe 18 is disposed at one end in the width direction of the packed crushed stone layer 13. The end confirmation pipe 191 is disposed at the other end of the packed crushed stone layer 13 in the width direction. The first end confirmation pipe 191 a is disposed at the same position as the injection pipe 18 in the extending direction of the rail 2. The second end confirmation pipe 191 b is disposed at the end of the installation section of the base improvement in the extension direction of the rail 2. In addition to the end portion confirmation pipe 191, an intermediate portion confirmation pipe 192 may be installed. The middle part confirmation tube 192 is disposed, for example, between the pair of rails 2 and between adjacent pairs 1.

The grout material 16 is injected into the packed crushed stone layer 13 from the injection port 14 exposed by the injection pipe 18. Since the injection pipe 18 is disposed at one end of the packed crushed stone layer 13, the grout material 16 is filled from one end of the filled crushed stone layer 13. The grout material 16 flows and spreads in the order of the first area A1 and the second area A2 shown in FIG. Thereafter, the filling of the grout material is confirmed at the filling confirmation port 15 exposed by the end confirmation pipe 191. Since the end confirmation pipe 191 is installed at the other end of the packed crushed stone layer 13, it can be confirmed that the grout material 16 is filled up to the other end of the filled crushed stone layer 13. In addition to the first end confirmation tube 191a, the filling of the grout material 16 is confirmed by the second end confirmation tube 191b disposed at the end of the construction section. Thereby, it can be confirmed that the whole of the packed crushed stone layer 13 is filled with the grout material.
In FIG. 14, the modified example of the embodiment (in the case where the injection pipe 18 and the confirmation pipe 19 are adopted as the injection port / confirmation port exposure forming means) has been described, The same applies to the case where the bag 10 is adopted.

  Further, the arrangement and the number of the inlets 14 and the filling confirmation openings 15 of the grout material 16 may be determined appropriately according to the construction conditions and the like, and it is not necessary to limit as in the present embodiment.

DESCRIPTION OF SYMBOLS 1 sleeper 2 rail 3 construction machine 4 floor ballast 5 base 6 recess 6a bottom 7 crushed stone 8 compacting machine / rolling machine 9 crushed stone filled bag body (inlet / confirmation port exposure forming means)
10 crushed stone filled bag (inlet and confirmation port exposure forming means)
11 Crushed Bag Group 12 Ballast 13 Filled Crushed Bed 14 Inlet 15 Filling Confirmation Port 16 Grout Material 17 Basement Improvement Part 18 Injection Pipe 19 Verification Pipe 191 End Verification Pipe 191a First End Verification Pipe 191b Second End Verification Pipe 192 Intermediate check tube

Claims (3)

It is a construction method to improve the roadbed of the railway,
Road floor ballast removal / existing road base exposure process, which removes existing road base ballast and exposes existing road base,
An existing roadbed excavating step of excavating the roadbed and forming a recess in a construction area;
Crushed stone filling step of laying the crushed stone in the recess and filling it, to form a filled crushed stone layer;
Grouting material filling step of injecting and filling grout material into the packed crushed stone layer;
An injection port for injecting the grout material when performing the grout material filling step and an injection port for forming and exposing a filling confirmation port for confirming the filling condition of the grout material in the filled crushed stone layer -A channel improvement method characterized in that it comprises an injection port and confirmation port exposure forming means installation step of installing a confirmation port exposure forming means. In the roadbed improvement method according to claim 1,
The crushed stone filled bag body in which the crushed body is filled in the bag body is used as the injection port / confirmation port exposure forming means,
The crushed stone is laid and filled in the recess and the crushed stone filled bag is disposed in the recess, and the inlet and the inlet are removed by removing the crushed stone filled bag when performing the grout filling step. A basement improvement method characterized by exposing and forming a filling confirmation opening. In the subgrade improvement method according to claim 1 or 2,
In the injection port / confirmation port exposure forming means installation step,
The injection port exposure forming means of the injection port / confirmation port exposure forming means is disposed at one end of the packed crushed stone layer in plan view,
A channel improvement method characterized in that the confirmation port exposure forming means among the injection port / confirmation port exposure forming means is installed at the other end of the packed crushed stone layer in plan view.

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