JPH0434280A - Method for removing underground buried object - Google Patents

Abstract

PURPOSE:To eliminate a controversial point of correlation to superficies of the cut-and- cover method by constructing a shaft by enveloping a buried object, pressing in a lead pipe and a propulsive pipe equal to or larger than the buried object along it, destruction-removing the buried object in the vicinity of the lead pipe and thereafter drawing out the propulsive pipe and the lead pipe to a shaft side while filling solidifying agent. CONSTITUTION:A shaft 2 is constructed by enveloping a buried pipe 1 to remove it in the inside of the shaft 2, and next, a lead pipe 7 and a propulsive pipe 8 in size equal to or larger than the buried pipe 1 are concentrically set up with the buried pipe 1. The buried pipe 1 is destructed in the vicinity of the lead pipe 7, while pressing in the lead pipe 7 and the propulsive pipe 8 by a propulsive jack 9 along the buried pipe 1, and successively removed, and a partition 10 is mounted in the front part of the lead pipe 7 after completion of removal. The propulsive pipe 8 and the lead pipe 7 are drawn out to a side of the shaft 2 while injection charging a charge part 16, after the buried pipe is removed, with a solidifying agent by an injection pump 15 from an injection hole 13 provided in the partition 10. By the above method of construction, insufficiency of destructive strength by a rock auger and a controversial point to superficies of the cut-and-cover method are eliminated.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method of removing buried objects such as pipes that have already been buried underground using a tunnel construction method, and then creating a structure that has the same strength as the surrounding ground. The present invention relates to a method for removing underground objects or obstacles by injecting a filler having the following properties.

<Conventional Technology> When newly installing a large-scale underground structure such as a subway under a road, existing structures (buried objects, foundation piles, etc.) may become a major obstacle.

Conventionally, there are the following methods of removal in such cases.

(I) A method of destroying underground objects using a rock auger.

In this method, a rock auger attached to a pile driver is used to drill a hole from the ground, and the auger head is used to destroy the buried material.

(n) A method of removing buried objects using the open-cut method.

Drive earth retaining piles on both sides of the buried object, and expose and destroy the buried object while sequentially installing earth retaining shoring from the top.

This method involves backfilling with high-quality soil after removal and pulling out the earth retaining piles.

<Problem to be solved by the invention> In the conventional removal method, the former method of destroying buried objects is easy, but when the removal method is circular or continuous, the auger head does not work effectively. Otherwise, the perforation becomes milky and cannot be destroyed reliably.

Furthermore, there is a problem in that it is difficult to destroy concrete or reinforced concrete due to the insufficiency of the auger head.

On the other hand, the latter open-cut method is also a common method, but its adoption has become difficult in recent years for the following reasons.

(b) Those using the shield method or propulsion method have a deep top cover.

(b) It is undesirable in areas with heavy traffic as it will cause traffic congestion.

(c) Cannot be adopted if a river or railway crosses the area.

(iv) If there are buried objects close to the property line, it will be necessary to lease the land, or if the retaining piles used in the open-cut construction method remain, it will be necessary to purchase the surface rights.

(e) Cannot be adopted if there are important buried objects that cannot be relocated.

The present invention has been made in order to solve the problems of the conventional construction method, and aims to provide a new removal method in which underground objects are removed using the tunnel construction method and then replaced between the ground and mountains. This is the purpose.

(Means for Solving the Problems) In order to solve the above problems, the method for removing underground objects according to the present invention is to construct a vertical shaft so as to enclose the underground objects, and to construct a shaft that is equivalent to or similar to the underground objects. After pushing the larger leading pipe and propulsion pipe along the buried object and destroying or pushing out the buried object near the leading pipe and removing the buried object one by one, a bulkhead is attached to the front or rear of the leading pipe, and an injection hole is installed in this. The system is characterized in that the propulsion pipe and the leading pipe are sequentially pulled out toward the shaft side and removed while injecting the filler material through the injection pump.

(Operation) In the present invention, first, a vertical shaft is constructed to enclose a buried object, and the buried object inside this shaft is removed. Then, a leading pipe and a propulsion pipe that are equal to or larger than the buried object are installed concentrically with the buried object, and a propulsion jack is used to use the reaction force provided on the side wall of the shaft as a reaction force to move the leading pipe and propulsion pipe to the buried object. While pushing along the pipe, destroy or push out the buried objects near the lead pipe and remove them one by one.

After removing the buried objects in this way, attach a bulkhead to the front or rear of the lead pipe, make an injection hole in it, connect the injection pipe, and inject a filler such as a solidifying agent through an injection pump. ,
While adjusting the injection pressure, injection amount, and withdrawal amount to prevent the ground from collapsing, the propulsion pipe and leading pipe are sequentially pulled out toward the shaft side.
At the same time, the area where the buried objects were removed is backfilled with filler material.

<Embodiments> Examples of the present invention will be described below with reference to FIGS. 1 to 5, and other embodiments will be described with reference to FIGS. 6 to 12.

First, as shown in Figure 1, a vertical shaft 2 is constructed so as to enclose the existing buried pipe 1 buried underground, the buried pipe 1 inside is removed, and a back wall is placed on the side wall of the vertical shaft 2. A reaction force body 3 such as concrete is provided. Next, FIGS. 2 and 5.
As shown in Fig. 6, a cutting edge 4 that is equal to or larger than the buried pipe 1, a skin plate 5. A leading pipe 7 and a propulsion pipe 8 composed of reinforcing ribs 6 are installed concentrically with the buried pipe 1, and the leading pipe 7 is moved by a propulsion jack 9 using the reaction force body 3 as a reaction force.
Then, while pushing the propulsion pipe 8 along the buried pipe 1 in the direction of the arrow in FIG. 1, the buried pipe 1 is destroyed or pushed out near the leading pipe 7 and removed one by one.

In this way, after completing the removal target section of the buried pipe 1 which is unnecessary and has become an obstacle, a partition wall 10 is attached to the front or rear part of the leading pipe 7, as shown in FIG.

As shown in FIG. 5, the partition wall 10 is made of a steel plate 11 and an H steel material 12, and is constructed with injection holes 13 provided at appropriate locations.

An injection pipe 14 is connected to the injection hole 13 of this partition wall 10, and an injection pump 15 is further connected to the injection pipe 14, and a solidifying agent, such as portland cement, clay, water, or a retarder, is added to the injection pipe 14.
A mixture of liquid and liquid b made of water glass is injected and filled as a filler into the filling portion 16 after the buried pipe is removed.

This filling material is injected while adjusting the injection pressure, injection amount, and withdrawal amount of the propulsion pipe 8 so as to prevent the ground 17 from collapsing.
The propulsion pipe 8 and the leading pipe 7 are sequentially pulled out toward the shaft 2 side, and the propulsion pipe 8 and the leading pipe 7 are removed and replaced with filler material after removal.

The propulsion tube 8 can be pulled out using a propulsion jack used for propulsion, an intermediate jack, a winch, etc., but the pulling force can be applied by appropriately applying the filler injection pressure.

On the other hand, as another example, as shown in FIG. There is a method of removing the reaction force body 3 and further installing a reaction force body 3 on the side wall of the shaft 2. That is, as shown in Fig. 2 and Fig. 5.6, the cutting edge 4. is equal to or larger than the buried pipe l. Skin plate 5.
A leading pipe 7 composed of reinforcing ribs 6 and a propulsion pipe 8 are installed concentrically with the buried pipe 1, and using the reaction force body 3 as a reaction force, the leading pipe 7 and the propulsion pipe 8 are buried using a propulsion jack 9. While pushing along the tube 1 in the direction of the arrow shown in FIG. 1, insert the leading tube 7.
Buried pipes 1 are destroyed or pushed out in the vicinity and vertical shafts 2' are sequentially removed and pushed forward.

After completing the removal of buried pipe 1 in this way, the eighth
．． A bulkhead 18 shown in FIG. 9 is installed, and a bulkhead 10' is attached to the rear of the rearmost propulsion tube 8. The partition wall 10° is constructed of a steel plate 11 and an H steel material 12, with injection holes 13 provided at appropriate locations, similar to that explained with reference to FIG. An injection pipe 14 is connected to the injection hole 13 at 10° of this partition wall, and an injection pump 15 is further connected to the injection pipe 14, and a solidifying agent such as portland cement, clay, water, and a liquid consisting of a retarding agent is added.
A mixture of liquid B made of water glass is used as a filler and is injected into the filling portion 16 after the buried pipe is removed. This injection and filling of the filler material is carried out while adjusting the injection pressure, injection amount, and amount of withdrawal of the propulsion tube 8 so as not to cause collapse of the ground 17, while sequentially pulling out the propulsion tube 8 at a 2° angle from the shaft. Propulsion tube 8
At the same time as the removal, replacement with filler material will be carried out.

In yet another embodiment, as shown in FIG. 11, if there is an obstacle l'', a single launch shaft 2 is constructed, and a propulsion jack 9 is used to move the obstacle 1° using the reaction force 3. After removing the obstacle l'', attach the bulkhead 10 to the front or rear part of the leading pipe 7, and fill the filling part 1 with the same filling material as described above.
6 is injected and filled, the propulsion pipe 8 is removed to the shaft 2 side.

Furthermore, since this method allows obstacles to be removed in advance, it will also pave the way for the adoption of sealed shields.

<Effects of the Invention> As explained above, according to the present invention, the following great effects can be achieved.

■Since buried objects can be removed using the tunnel construction method, there will be no hindrance to road traffic, etc.

■Also, since it is a tunnel construction method, construction can be carried out right up to the property line. Therefore, there will be no problem of land lease or surface rights, and there will be no aggravation of feelings among roadside residents.

■Since the propulsion method is used, the propulsion pipe can be pulled out after removing the buried pipe or obstacles.

■Since the propulsion tube is pulled out while injecting filler, the ground does not collapse.

■The injection pressure of the filler can be used to pull the propulsion tube, making it easy to pull out the propulsion tube.

■The propulsion pipe can be freely removed to either the starting shaft side or the destination shaft side.

■In addition to buried pipes, it is also possible to remove obstacles such as foundation piles.

■After removing obstacles, auxiliary works such as ground improvement methods and underground water level lowering methods can be performed using the propulsion pipe as a working pit.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the method for removing underground objects according to the present invention, Fig. 2 is a sectional view taken along the line A and -A in Fig. 1, and Fig. 3 is a side view showing the method for removing underground objects according to the present invention. A side view showing the state in which the propulsion tube is pulled out; FIG. 4 is a sectional view taken along the line B-B in FIG. 3; Figure 5 is a cross-sectional view showing the structure of the leading pipe and bulkhead, Figure 6 is a cross-sectional view taken along the line C--C in Figure 5, and Figure 7 is a method for removing underground objects using multiple vertical shafts. 8 is an explanatory diagram of the main part of FIG. 7, FIG. 9 is a diagram illustrating the partition of the shaft, and FIG. 10 is a sectional view taken along the line D-D in FIG. 9. FIG. 11 is a diagram showing another method of removing obstacles. FIG. 12 is an explanatory diagram of the main part of FIG. 11. l... Buried pipe, 2.2'-... Vertical shaft. 3...Reaction force body, 4...Blade mouth. 5...Skin plate, 6...Reinforcement rib. 7... Leading pipe, 8... Propulsion pipe. 9... Propulsion jack, 10.10'... Bulkhead. 11... Steel plate, 12... H steel material, 13-... Injection hole. 14--Infusion tube, 15--Infusion pump. 16... Filling part, 17-... Earth, 18...
・Shaft bulkhead. 19...Shaft earth retaining wall, 20-...Caulking.

Claims (1)

[Claims] A vertical shaft is constructed to enclose the underground object, and a leading pipe and a propulsion pipe that are equal to or larger than the buried object are pushed along the buried object, and the buried object is destroyed or pushed out near the leading pipe to remove the buried object. After removing them one by one, attach a bulkhead to the front or rear of the leading pipe, make an injection hole in it, connect the injection pipe, and sequentially move the propulsion pipe and leading pipe to the shaft side while injecting filler through the injection pump. A method for removing underground objects characterized by pulling them out and removing them.