JPS60152718A - Method of improving railroad ground wherein hardener is poured in ground of depth - Google Patents

Abstract

PURPOSE:To improve a ground down to a deep part, by a method wherein a ground is bored down to a deep part between rails and sleepers, and after a hardener is poured in the bore, the upper part of a ground is agitated by an agitating member to inject a soil hardener. CONSTITUTION:With a drill inserting device 12 for boring on a truck 5 actuated, a drill 13 for boring is inserted down to a deep part of a ground between sleepers 3 and rails 4. A rapid hardener is poured in a hole 14 so bored through the use of the hollow part of a drill 14, and this enables a columnar object, which is formed by a hardener hardened to be located in a ground of depth. Further, after a casing 9 is driven onto the columnar part, a rotary rod 8 containing an agitating member 10 is inserted, and with the rotary rod 8 rotated, a soil hardener is mixed as soil is agitated by the agitating member 10, and this improves the ground.

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 bed is constructed by heaping up ballast 2 on top of the ground 1 made by heaping up earth and sand, installing sleepers 3 on top of the ballast, and placing the rails on top of the sleepers 3. However, due to use over time, the ground 1 made of earth and sand absorbs water and becomes soft, and due to the repeated loads of trains passing on the rails, the earth and sand turns into mud and spreads between the ballast 2. Mud ejects from the ground and mixes with the ballast layer, worsening the load distribution effect of the ballast layer, causing deterioration of the roadbed, such as unevenness of the roadbed due to subsidence, and causing vibrations to trains due to track misalignment. This can make the ride uncomfortable and even increase the risk of derailment.

However, since railway decks are used on a daily basis, it is difficult to remove the rails, sleepers, ballast, 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, ballast, and rails 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 spewing out, as will be described later. 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 injects a solidifying agent into the deep part of the ground by drilling holes between railroad tracks, sleepers, etc., and the ground above the part where the solidifying agent is injected is formed according to the conventionally proposed method shown in FIG. This is a railway ground improvement method that improves the roadbed from the deep layer to the shallow layer by improving each type of ground using the described roadbed improvement method and combining the two.

(Embodiments) The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a conceptual side view showing the state in which the first half of the process of the present invention is being carried out. A polling drill insertion device 12 is mounted on the cart 5, and a boring drill 13 is inserted by this device. Similarly to the above, it is inserted between the ballast, rails, sleepers, etc. to a deeper part than the ground to be improved by the invention explained in FIG. 1 above. Since the poling drill can be inserted with additional parts added along the way, it is not restricted by the height of overhead wires, tunnels, etc., and the ground into which it is inserted can be deepened to reach bedrock if necessary. A rapid hardening agent is injected into the hole 14 thus drilled using the hollow part of the poling drill. Examples of the rapid hardening agent include a combination of cement and an aqueous solution of inorganic salts such as sodium, potassium, magnesium, aluminum, calcium, and iron, and Denka H8-K.
- Stabilite M3 (+-F etc. may be used, but it goes without saying that other solidifying agents may also be used.

As a result of the above, the deep part of the ground is
As shown in..., columnar objects solidified with solidifying agent are arranged in a row.
If necessary, it can be placed to reach the bedrock.

After solidifying and stabilizing the deep part of the ground in this way, as a second half of the process of the present invention, the casing and rotation are carried out on the solidifying agent arranged in the rows by the method explained in FIG. 1 above. A soil solidifying agent is mixed into the earth and sand using a stirring member to solidify the area, thereby reinforcing and stabilizing it.

That is, FIG. 3 is a conceptual side cross-sectional view showing the latter half of the process of the present invention. As described above, the casing 9 with the screw for preventing the solidifying agent from spewing out at the base is driven into the space between the rails, sleepers, etc., and the rotary rod 8 with the stirring member 10 housed inside is attached to the tip of the casing.
is inserted up to the vicinity of the top surface of the columnar solidified solidifying agent arranged in a columnar manner in the first half process, and then the stirring portion 10 is expanded laterally as shown in the figure, and the rotating rod 8
While rotating the earth and sand in the area using the stirring member 10, a soil solidifying agent is mixed into the stirred earth and sand to solidify the earth and sand in the area into a columnar shape as shown in FIG. In this latter half of the process, the columnar hard part created by mixing the soil solidification agent into the soil in the shallow layer overlaps the hardened columnar part of the solidification agent installed in the deep layer in the first half of the process. That's why.

When the construction of the present invention is completed, the ground under the railway bed will be as deep as necessary, as shown in Fig. 4 and Fig. 5, respectively. The solidified columnar members of the solidifying agent installed in the first half of the process of the present invention are arranged in a row until reaching the bedrock, and on top of them, the aged soil and soil solidifying agent are placed in the second half of the process of the present invention. The mixture will be arranged in a column to the required density below the ballast layer. Therefore, rainwater and the like are less likely to be absorbed by the roadbed, flow into the side gutters 16, 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 deep part of the ground is stabilized by the first half of the process until it reaches the bedrock, if necessary, and the part immediately below the ballast layer is stabilized according to the present invention. Since the latter half of the process stabilizes the railway track, the roadbed of the railway track becomes strong, and the disadvantages mentioned at the beginning due to poor roadbed properties can be eliminated.

However, in the first half of the process, a poling drill is used,
Since polling drills can be added during polling, there are no restrictions due to the height of overhead wires, the center of gravity of bogies, the height of tunnels, etc., and if necessary, it can be used to drill deep into the ground, even up to the bedrock as described above. It has the advantage of being able to be improved.

Moreover, since the present invention is capable of improving the ground beneath the rails, ballast, etc., without having to remove them, the ground can be improved by short-term work such as at night without stopping the train.

Of course, there is no reason why the present invention should be limited to the above-mentioned embodiments, and in order to inject the quick hardening agent into the hole drilled by poling, it is only necessary to use the hollow part of the poling drill as described above. However, depending on the convenience of the work, a quick hardening agent may be injected into the hole where the poling drill was pulled out using a separate pipe, etc. Also, the quick hardening agent should be limited to those exemplified above. Nor. In addition, the tip of a poling drill is configured to be opened to serve as a stirring device, and after drilling in the first half step, the stirring device is opened to coarsely crush earth and sand in a wider area than the diameter of the drilled hole. However, if the soil solidifying agent and earth and sand are coarsely mixed in order from the tip of the hole toward the base, the intended purpose will be further served.

[Brief explanation of the drawing]

Fig. 1 is a conceptual side view of the conventionally proposed railway bed improvement method; Fig. 2 is a conceptual side view showing the first half of the process of the present invention;
Fig. 3 is a conceptual side cross-sectional view showing the latter half of the process of the present invention, Fig. 4 is a conceptual top view of the railway track in a state where the construction is completed according to the present invention, and Fig. 5 is a conceptual front cross-sectional view of the track. be. In the diagram: 1. Earth and sand 8. Rotating rod 9. Old casing 10. Stirring member
11... Sediment part solidified by the second half process of the present invention 13... Polling drill 14.
... Hole 15.15 ... Column-shaped object in which the quick hardening agent installed in the first half of the process of the present invention has solidified Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] A solidifying agent is injected into the hole drilled deep into the ground between railway tracks, sleepers, etc. using a drilling mechanism, a casing is inserted into the ground above the area where the solidifying agent is injected, and the hole is drilled from the tip of the casing. A stirring member provided on the protruding rotary rond stirs the ground part to eject the soil solidifying agent, and also solidifies the ground above the part where the solidifying agent is injected through the drilling,
A railway ground improvement method that injects a solidifying agent deep into the ground to stabilize the ground.