JPS60152720A - Method of improving railroad ground having lower part reinforced by hardener - Google Patents

Abstract

PURPOSE:To reinforce the ground through a way to a deep part thereof without being limited by the height of an aerial line, by a method wherein a hole is bored obliquely toward the ground below the lower part of a railroad subbase course from the side of the subbase course and after a hardener is poured in the hole, improvement of a ground right below the subbase course takes place. CONSTITUTION:A drill for boring is inserted from the side of a railroad subbase course toward the ground below the subbase course, a rapid hardener is poured in the hole so bored by the use of the hollow part of the drill to form a columnar object 12 formed such that a hardener is hardened in the ground of depth. As the earth in the ground right below the subbase course is agitated by the agitating member of an improving device, a soil hardener is mixed to improve the ground to form a hardened soil part 11. Since a hole is bored obliquely from the side of the railroad subbase course, this enables the ground to be reinforced down to a deep part thereof without being limited by the height of an aerial line.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ground improvement method for reinforcing and stabilizing railway ground, particularly weakened railway ground.

(Prior art) In general, a railway road board is constructed by raising ballast 2 on top of the ground ff1l made by heaving up earth and sand, installing sleepers 3 on top of it, and placing the rails on top of the sleepers 3. 4, but due to use over time,
The ground 1 made of the earth and sand absorbs water and becomes soft, and due to the repeated loads of trains passing on the rails, the earth and sand becomes mud and blows out from between the ballasts 2, and the mud mixes in the ballast layer, causing the ballast to deteriorate. This worsens the effectiveness of the roadbed, and also causes deterioration of the roadbed, such as unevenness due to subsidence, which causes vibrations to the train due to track deviation, making it uncomfortable to ride, and even increasing the risk of derailment. .

However, since railway decks are usually used every day, it has been difficult to remove the rails, sleepers, fulcrums, etc. and improve the soil beneath them. Therefore, in order to solve this problem, a patent application
Name of Invention No. 4668 In the invention proposed in the roadbed improvement method, as shown in a conceptual side view in Figure 1, a bogie 5 configured to run on rails 4 is made, and a A frame body 6 is installed, and a rotating rod 8 is inserted into the ground between the sleepers, paralast, and rail by means of a casing drive device 7 attached to the frame body 6.

The rotating rod 8 is installed in a casing 9, and a screw is attached to the base of the casing 9 to prevent the soil solidifying agent from spouting out, and a stirring member is attached to the tip of the casing after the casing is driven. By protruding the rotary rod 8 storing the stirring member 10, expanding the stirring member 10 laterally and rotating it, and ejecting the soil solidifying agent from the stirring member 10, the soil solidifying agent is mixed with the earth and sand. The earth and sand under the roadbed is solidified into a cylindrical shape as shown in Figure 11, and by this, without removing the rails etc.
Construction methods have been proposed to improve the ground underneath.

However, this roadbed improvement method also has the disadvantage that the length of the casing is limited by the height of the overhead wire, etc., so even if the ground has softened deep down, it can only improve the ground up to a certain depth. was there.

(Objective of the Invention) An object of the present invention is to further improve the roadbed improvement method described above, and to provide a method that stabilizes even the deep layers of the ground.

(Structure of the Invention) The present invention strengthens the lower part of the ground by injecting a solidifying agent into holes that are diagonally drilled from the side of the railway road bed toward the ground below the road bed using a drilling mechanism, and strengthens the lower part of the ground directly below the road bed. is the first
This is a railway ground improvement method in which the ground is improved by the roadbed improvement method explained based on the diagram, and the roadbed is improved from the deep layer by combining the two.

(Example) The present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 is a side cross-sectional conceptual diagram showing the process of soil improvement directly below the roadbed according to the present invention. After inserting the rotating rod 8 containing the stirring member 10 inside the casing from directly below the ballast layer to an appropriate depth, the stirring member 10 is inserted in the lateral direction as shown in the figure. The rotary rod 8 is rotated and the soil in the area is stirred by the stirring member 10, and a soil solidifying agent is mixed into the stirred earth and sand to form the soil in the area as shown in FIG. 11. The sea urchin solidifies into a cylindrical shape. Through this process, as shown in the top view of the railway in Figure 2, a cylindrical hard part is formed in the shallow part of the ground by mixing a solidification agent with earth and sand.

Figure 3 is a front cross-sectional conceptual diagram showing the state in which the process of strengthening the deep lower part of the ground has been completed. A suitable number of holes are drilled, a rapid hardening agent is injected into the holes, and an appropriate number of columns 12 containing the hardening agent are diagonally installed at the lower part of the roadbed. Since the polling drill can be inserted while adding parts along the way, it is not restricted by the height of overhead wires, etc., and the ground into which it is inserted can be deepened to reach bedrock if necessary. The hole 14 thus drilled is made by using the hollow part of the poling drill.
Inject rapid hardening agent. Examples of solidifying agents include sodium, potassium, magnesium, aluminum,
A combination of cement and an aqueous solution of inorganic salts such as calcium and iron, Denka-H3-K/Stabilite M30-
Although F and the like may be used, it goes without saying that other solidifying agents may also be used.

As a result of the above, the deep lower part of the ground is
As shown in ..., the columnar objects solidified with the solidifying agent can be arranged diagonally so as to reach the bedrock, if necessary.

In this way, the deep lower part of the ground is solidified and stabilized, and as a ground improvement process directly below the roadbed, a soil solidifying agent is mixed into the earth and sand using the casing and rotating stirring member using the method explained in Figure 1 above. The area is solidified to strengthen and stabilize it.

Thus, when the construction of the present invention is completed, as shown in the front cross-sectional conceptual diagram in FIG. A large number of columnar members in which the solidifying agent installed in the ground improvement process of the present invention has been solidified are arranged diagonally, and on top of them, the mixture of soil and solidifying agent that has been matured in the ground improvement process directly below the roadbed of the present invention is applied to the ballast layer. They will be arranged in a cylindrical shape with the required density all the way to the bottom. Therefore, rainwater and the like are less likely to be absorbed by the roadbed, flow into the side gutters 13, and become less likely to soften the ground again.

(Effects of the Invention) The present invention is a construction method configured as described above, in which the ground immediately below the ballast layer is treated by the ground improvement process immediately below the roadbed of the present invention.
The deep lower part of the roadbed is stabilized by the above-mentioned deep lower ground improvement process until it reaches bedrock if necessary, and the roadbed of the railway track becomes strong, and the disadvantages mentioned at the beginning due to poor roadbed properties etc. can be eliminated.

Furthermore, as mentioned above, the ground improvement work of the present invention can be carried out separately into the ground improvement process immediately below the roadbed and the ground improvement process deep below the ground, so the work can be carried out separately during short periods when trains are not passing, such as at night. It also has the advantage of being able to

In addition, the ground improvement process in the deep lower part of the ground uses a two-pole drill, and even though the polling drill can be used to add parts during the polling process, the work can be done without removing paralast, rails, etc. Accordingly, as mentioned above, it has the advantage of being able to improve the ground even deep down to the bedrock.

Of course, there is no reason why the present invention should be limited to the above-mentioned embodiments, and the order of the deep lower ground improvement process and the ground improvement process directly below the roadbed may be changed as appropriate, and the polling In order to inject the rapid hardening agent into the drilled hole, in addition to using the hollow part of the poling drill as described above, depending on the work, it is necessary to insert another pipe into the hole where the poling drill was pulled out. The rapid hardening agent may be injected by the following methods, and the rapid hardening agent need not be limited to those exemplified above. In addition, the tip of the poling drill is configured to be opened, and it is used as a stirring device, and after drilling in the first half step,
The stirring device is opened, and while coarsely crushing the earth and sand in an area wider than the diameter of the drilled hole, from the tip of the hole to the base,
If the soil solidifying agent and the earth and sand are coarsely mixed in sequence, the intended purpose will be further served.

[Brief explanation of the drawing]

Figure 1 is a conceptual side view of the method of the ground improvement process directly below the roadbed that has been proposed in the past and is used in the present invention; Figure 2 is the top view of the railway track after the process in Figure 1; Figure 3; 1 is a front cross-sectional conceptual diagram of the ground in a state where the above two steps of the present invention have been completed. In the figure: 1... Sediment 8... Rotating rod 9... Casing 10... Stirring member 11. Old... Ground improvement directly below the roadbed of the present invention Earth and sand part solidified by the process 12・12...Column-shaped object where the hardening agent installed by the ground improvement process in the deep lower part of the roadbed of the present invention has solidified

Claims (1)

[Claims] A hardening agent is injected into the hole diagonally drilled from the side of the railway bed toward the lower part of the roadbed using a drilling mechanism to strengthen the deep lower part of the ground, and a casing is inserted into the ground directly below the roadbed. , stirring the ground part with a stirring member provided on a rotating iron protruding from the tip of the casing to eject the soil solidifying agent, and also solidifying the ground above the part where the solidifying agent is injected through the perforation; A railway ground improvement method that injects a solidifying agent deep into the ground to stabilize the ground.