JP5472878B2 - Labor-saving track lift-up device and lift-up method - Google Patents

Description

  The present invention relates to a lift-up device and a lift-up method for a labor-saving track, and more particularly, a lift-up device for a labor-saving track that includes a filling layer formed on the ground and supports the rail with sleepers provided on the filling layer, and It relates to a lift-up method.

The labor-saving track, which uses ballast (the crushed stone spread under the rail) about 50 cm above the ballast track, cemented with cement, can prevent ballast from coming out. In addition, the labor-saving trajectory has advantages such as less prone to bed deterioration and trajectory deviation than the ballast trajectory in which the sleepers are installed directly on the ballast, and further has the advantage that work such as replenishment of ballast can be reduced. .
However, although trajectory deviation is less likely to occur than the ballast trajectory, most of the ground under the trajectory is N-value self-settled (since it sinks due to the weight of the structure itself) and the soft embankment of the ROHM layer with an N-value of about 5 or less ( Soft ground), and subsidence (dissimilar subsidence) is occurring for each labor-saving track due to the vibration load of the train.
Conventionally, the allowable subsidence amount on the rail surface is about 2cm, and at the part exceeding this allowable subsidence amount, excavation on both sides of the track, inserting jacks, lifting up the entire labor-saving track, The cement-based injecting material is replenished as a filler in the space between the labor-saving track bottoms, and the rail is adjusted to an allowable height after replenishment (Patent Document 1). FIG. 12 is a cross-sectional view showing a process for countermeasures against land subsidence. A ballast portion about 50 cm above the ballast track 1 is consolidated with a cement injecting material to form a filling layer 2 on the filling layer 2. A part of the sleeper 3 is embedded and fixed, and rails 4 a and 4 b are attached thereon to form a labor-saving track 5.
As shown in FIG. 12 (A), when the subsidence amount exceeds the allowable subsidence amount, as shown in FIG. 12 (B), the ballast portions 1a and 1b on both sides of the labor-saving track 5 are excavated, and the excavation part The jacks 6a and 6b are inserted, the entire labor-saving track is lifted up to a predetermined height, and in this state, the cement-based injection material 8 is replenished as a filler in the gap 7 of the track base (see arrow A), and after completion of refilling The rail is adjusted to an allowable height, and finally, as shown in FIG. 12 (C), ballast is buried in the excavated portions on both sides of the track to complete the ground settlement measures.

JP 2007-247356 A

However, in this conventional method, there are three processes: 1) excavation on both sides of the track and jack insertion work, 2) track lift-up and filling material injection, and 3) ballast backfilling and track maintenance work. This is necessary, and there is a problem that ground subsidence measures, particularly lift-up work, become large, and the repair period is prolonged. In addition, since the injection of the filler of the conventional method is not a basic countermeasure for ground subsidence, there is a problem that a large lift-up operation must be performed every time the track exceeds the allowable subsidence amount.
From the above, an object of the present invention is to enable the rail height to be adjusted efficiently without excavation work or ballast backfilling work.
Another object of the present invention is to make it possible to adjust the rail height by lifting the labor-saving track without using a jack.
Another object of the present invention is to make it possible to perform a basic ground settlement countermeasure simultaneously with a ground settlement repair work.

The present invention is a labor-saving track lift-up device and a labor-saving track lift-up method that includes a filling layer formed on the ground and supports rails with sleepers provided on the filling layer.
-Labor-saving track lift-up device The labor-saving track lift-up device of the present invention comprises a plurality of support portions respectively installed on both sides of the labor-saving track, a reaction force support supported above the track by the support portions, A lifting part that is attached to the reaction force mount and is connected to a plurality of bolt members placed on the filling layer of the labor-saving track and pulls up the labor-saving track, and has a lifting force on the lifting portion. The reaction force of the lifting force is received by the support portion via the reaction force mount, and the labor-saving track is pulled up.
-Labor-saving track lift-up method In the labor-saving track lift-up method of the present invention, a plurality of bolt members are placed on the filling layer via sleepers, and a plurality of support portions are provided on both sides of the labor-saving track. Install and support the reaction force pedestal above the track by the support, and attach a lifting part that pulls up the labor-saving track connected to each bolt material to the reaction force pedestal and generates a lifting force in the lifting part Then, the reaction force of the lifting force is received by the support portion through the reaction force mount, and the labor saving track is pulled up.

According to the present invention, a plurality of bolt members are placed on the filling layer via sleepers, and a plurality of support portions are installed on both sides of the labor-saving track. A lifting portion that is connected to each bolt member and pulls up a labor-saving track is attached to the reaction force mount, and a lifting force is generated in the lifting portion, and the reaction force of the lifting force is used for the reaction force. The labor-saving track is lifted by being received by the support portion via a gantry, so there is no need for excavation work or back-filling of the ballast, and the rail is lifted up without using a jack. The height can be adjusted efficiently.
According to the present invention, before and after lifting the labor-saving track, it is possible to easily add a step of placing a perforated steel pipe in the ground through the sleepers and the filling layer, and from the perforated steel pipe, By injecting the injection material into the gap between the ground and the labor-saving track generated by lift-up, it is possible to perform basic ground subsidence countermeasure work simultaneously with the ground subsidence repair work.

It is a block diagram of the lift-up apparatus of the labor saving track | orbit of this invention. It is the top view and side view of a lift-up apparatus. It is an explanatory view of placing bolt material on a labor-saving track. FIG. 3 is an explanatory diagram for placing a perforated steel pipe. It is explanatory drawing which drives the injection pipe combined micropile which is a perforated steel pipe using the drilling machine for micropile installation. It is installation explanatory drawing of a lift-up apparatus. It is explanatory drawing of raising the labor saving track | orbit by a lift-up apparatus. It is ground reinforcement process explanatory drawing. FIG. 9 is a partially enlarged view of FIG. 8. It is a ground repair process explanatory drawing under a labor-saving track. It is sectional drawing after ground restoration under a labor-saving track and ground reinforcement completion. It is sectional drawing which shows the process of the conventional ground subsidence countermeasure.

(A) Labor-saving track lift-up device FIG. 1 is a configuration diagram of a labor-saving track lift-up device according to the present invention.
In FIG. 1, a ballast portion about 50 cm above the ballast track 11 is consolidated with a cement injection material to form a filling layer 12, and a concrete sleeper 13 is embedded and fixed on the filling layer 12. The rails 14a and 14b are attached to the upper part to constitute a labor saving track 15. The ballast track 11 is installed on a roadbed (ground) 16, and the ballast portion 11a excluding the labor saving track 15 forms a water permeable layer.
A plurality of bolt members 17a, 17b, 17c are placed in the filling layer 12 through the sleepers 13, and two holes are formed in the ground 16 through the sleepers 13, the filling layer 12, and the water permeable layer 11a. A steel pipe (injection pipe) 18 is penetrated, and a protective lid 19 is installed at the injection port. Cement-based injecting material is injected into the surrounding area of the perforated steel pipe 18 into the surrounding underground (ground) 16 and the space (not shown) between the labor-saving track 15 and the ground 16 generated by lift-up. A large number of holes 18a are provided. The bolt members 17a to 17c and the perforated steel pipe 18 may be attached in advance, or may be placed when ground subsidence is repaired.

The lift-up device is fixed at appropriate positions of the support portions 21a to 21b installed at two positions on each side of the labor-saving track 15, the reaction force mount 22 supported above the track by the support portions, and the reaction force mount. These are attached to the I-shaped steels 23a to 23c, the lifting PC steel materials 24a to 24c, and the I-shaped steels 23a to 23c, which serve as traction means by attaching a lifting portion to be described later, and the bolt material 17a via the lifting PC steel materials 24a to 24c. To 17c, and includes lifting portions 25a to 25c for lifting the labor saving track 15 by hydraulic pressure.
Each of the support portions 21a and 21b is, for example, a lift jack (kirin jack) having a yield strength of 1000 KN and a mass of 75 Kg, and the reaction force mount 22 is a temporary mountain retaining material H steel. As shown in the plan view and side view of FIGS. 2 (A) and 2 (B), the reaction force mount 22 is bolted on support portions (lift jacks) 21a to 21b installed at four locations around the labor-saving track. It is fixed by a stopper (not shown), and the installation height of the reaction force base 22 can be adjusted by lift jacks 21a to 21b. The I-shaped steels 23a to 23c as traction means are vise fixed on the reaction force base 22 so that the lifting portions 25a to 25c are directly above the bolt members 17a to 17c. The lifting portions 25a to 25c are hydraulic center hole jacks, and are installed on the I-shaped steels 23a to 23c so as to be respectively located above the bolt members 17a to 17c. Further, the lifting portions (hydraulic center hole jacks) 25a to 25c are connected to bolt members 17a to 17c through the lifting PC steel materials 24a to 24c, respectively, and individually connected to a hydraulic unit (not shown), Generates a pulling force. In addition, a screw part is once formed in PC steel materials 24a-24c for raising, and it connects with bolt material 17a-17c through the nut mentioned later by this screw part.
The lift-up device is not normally installed, and is installed around the labor-saving track when lifting the labor-saving track due to ground subsidence.

(B) Ground repairing process In order to perform ground repairing when the ground settlement exceeds the allowable settlement, bolt materials 17a to 17c are first placed. Note that this step is not necessary when the bolt members 17a to 17c are already placed.
The bolt members 17a to 17c are, for example, chemical anchors. As shown in FIG. 3A, (1) a hole is drilled with a hammer drill to a predetermined depth of the filling layer 12 through the sleeper 13, and (2) after drilling, bolts 17a to 17c are driven into the drilled part. At the same time, a connecting nut 17d is installed on the proximal bolt portion of each anchor material. (3) After placing, a protective lid 17e is fitted into the nut 17d. FIG. 3 (B) is a detailed explanatory drawing of the bolt material placing procedure. (1) The filling layer 12 is drilled through the sleepers 13 and the inside of the hole is cleaned. (2) After drilling and cleaning, The fixing material capsule 17f is inserted into the drilling portion, (3) after the capsule is inserted, the bolt material 17a having a screw portion on the hand side is inserted, and the nut 17d is fitted into the screw portion, and (4) finally a protective cover 17e. When lifting the labor-saving track, (5) the protective lid 17e of each bolt member 17a to 17c is removed, and the PC steel members 24a to 24c for lifting (see FIG. 1) are installed on the bolt members 17a to 17c. The bolt members 17a to 17c and the lifting portions 25a to 25c are respectively connected by screwing into 17d.

When the installation of the bolt members 17a to 17c is completed, in order to perform ground subsidence countermeasure work (ground reinforcement work) simultaneously with ground subsidence repair work, as shown in FIG. 12 is pierced through the underground 16. The perforated steel pipe 18 is, for example, an injection pipe combined micropile, and in order to place the injection pipe combined micropile, as shown in FIG. A well-known micropile installation drilling machine 32 is placed on top, and (1) the micropile installation drilling machine 32 penetrates through the sleepers 13, the filling layer 12, and the water permeable layer 11a to the ground 16; 2) After completion of drilling, the micropile 18 combined with an injection tube is inserted, and a protective lid 19 is installed at the injection port. When placing, the injection pipe combined micropile 18 needs to be placed so that at least one hole 18a is located in a gap (not shown) generated by lifting the labor-saving track. Further, a cloth bag (not shown), which will be described later, is placed under the injection pipe combined micropile 18.
When the penetration of the perforated steel pipe (micropile combined with the injection pipe) 18 is completed, the steel mount 31 for drilling machine and the drilling machine 32 for installing micropile are removed, and the lift-up device is set. That is, as shown in FIG. 6, support portions (lift jacks) 21 a to 21 b are installed at four locations on both sides of the labor-saving track 15, and a reaction force base 22 is placed on the support portions and fixed with bolts. Create the platform above the track. Subsequently, I-shaped steels 23a to 23c as traction means are fixed to the reaction force gantry 22 on the reaction force gantry 22, and then the reaction force gantry 22 is supported by the support portions (lift jacks) 21a to 21b. Adjust the installation height.

When the adjustment of the installation height is completed, the protective lid 17e of the bolt members 17a to 17c is removed, and the tip screw portions of the lifting PC steel materials 24a to 24c are screwed into the nut 17d and connected to the bolt members 17a to 17c. Next, at the position directly above the bolt members 17a to 17c, the hydraulic center hole jacks 25a to 25c are visely fixed to the I-shaped steels 23a to 23c, and the other ends of the lifting PC steel materials 24a to 24c are connected to the center hole jacks 25a to 25c. 25c. Moreover, each hydraulic center hole jack 25a-25c is individually connected to a hydraulic unit (not shown).
With the above, the setting of the lift-up device is completed, and the state shown in FIG. 1 is obtained.
In this state, when the lifting force of the labor-saving track is generated from the hydraulic unit to the hydraulic center hole jacks 25a to 25c which are the lifting portions, the reaction force of the lifting force is applied to the support portions 21a and 21b via the reaction force base 22. As shown in FIG. 7, the labor-saving track 15 is pulled up, and a gap 20 is generated between the bottom plate portion and the ground of the labor-saving track 15.

Next, an injection pipe 41 having one end connected to an injection plant (not shown) is connected to a micropile 18 combined with an injection pipe and a high pressure packer 42 for sking trout around the gap 20 as shown in FIG. It is inserted until it is positioned, and a pressure of 3 Mp is applied to the packer 42 to expand it under pressure. FIG. 9 is an enlarged view of a portion A in FIG. 8, and 43 is a cloth packer 43 that covers the micropile 18 combined with an injection tube.
(2) In this state, cement milk (ground improvement grout) is injected from the injection pipe 41. The injected cement milk is discharged from a large number of holes 18a formed in the injection pipe combined micropile 18. As a result, the fabric packer 43 covering the micropile 18 combined with the injection tube is pressurized and expanded in the surrounding ground 16 and the water permeable layer 11a by the discharged cement milk, thereby strengthening and improving the ground. In addition, the inside of the injection pipe combined micropile 18 is also filled with cement milk.
By the cloth packer 43, the escape of cement milk (grouting for ground improvement) to the water permeable layer 11a is prevented, so that limited ground improvement can be achieved, and a more reliable ground reinforcement effect can be obtained. However, the cloth packer 43 is not essential. When there is no cloth packer 43, cement milk is directly injected into the surrounding ground 16 and the water permeable layer 11a of the micropile 18 combined with the injection pipe to strengthen and improve the ground.

  When the injection of the cement milk to the surrounding ground is completed, the packer 42 is contracted and pulled up until the packer 42 is positioned around the middle part of the filling part 12, and then the water pressure 3Mp is applied to the packer 42 and pressurized expansion is performed. To do. In this state, cement milk is injected from the injection pipe 41. The injected cement milk is injected from the hole 18a formed in the injection pipe combined micropile 18 into the gap 20 generated between the bottom and the ground of the labor-saving track 15, and as shown in FIG. 20 is filled. After that, if the packer 42 is pulled up to the mouth, the inside of the micropile 18 combined with the injection tube is filled with cement milk, and the injection device and the lift-up device are removed, the ground restoration under the labor saving orbit and the ground reinforcement are completed. FIG. 11 is a cross-sectional view after the ground restoration under the labor saving orbit and the ground reinforcement completed.

As described above, according to the present invention, since the labor-saving track is pulled up by the lift-up device, excavation work and ballast backfilling work become unnecessary. Further, the rail height can be adjusted efficiently by lifting the labor-saving track. Furthermore, basic ground subsidence countermeasure work (ground reinforcement work) can be performed simultaneously with ground subsidence repair work.
In the above description, the case where the outer side of the perforated steel pipe is covered with the cloth packer has been described, but the cloth packer is not necessarily required.
Further, in the above description, the trajectory in which the ballast about 50 cm above the ballast trajectory is solidified with a cement injection material as a filling layer is described as a labor-saving trajectory, but the labor-saving trajectory is not limited to such a configuration. For example, the width is the same as in the embodiment, and the present invention can be applied to lift-up of a labor-saving track in which a ballast of the entire depth is consolidated with a cement injection material to form a filling layer.

11 Ballast track 12 Filling layer 13 Sleepers 14a, 14b Rail 15 Labor-saving track 16 Roadbed (ground)
17a, 17b, 17c Bolt material 18 Perforated steel pipe 20 Gap part 21a-21b Support part (lift jack)
22 Reaction Force Bases 23a-23c I-Shaped Steels 24a-24c PC Steel Materials 25a-25c for Lifting Lifting Center (Center Hole Jack)

Claims (2)

In a lift-up device for a labor-saving track comprising a filling layer formed on the ground, and supporting a rail by a sleeper provided in the filling layer,
A plurality of support portions installed on both sides of the labor-saving track,
A reaction force support supported above the track by the support,
A lifting portion that is attached to the reaction force gantry and is connected to each of a plurality of bolt members placed on the filling layer of the labor-saving track to raise the labor-saving track,
A pulling force is generated in the pulling portion, and the reaction force of the pulling force is received by the support portion via the reaction force mount to pull up the labor-saving track.
Labor-saving track lift-up device. In a lift-up method of a labor-saving track comprising a filling layer formed on the ground, and supporting rails by sleepers provided in the filling layer,
Placing a plurality of bolt materials on the filling layer through sleepers,
Install multiple supports on both sides of the labor-saving track,
Supporting the reaction force gantry above the track by the support,
Attach a lifting part that is connected to each bolt material to raise the labor-saving orbit to the reaction force mount,
A pulling force is generated in the pulling portion;
The reaction force of the lifting force is received by the support portion via the reaction force mount, and the labor-saving track is lifted.
A lift-up method for a labor-saving orbit characterized by that.

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