JP2006176989A - Long-sized forepoling construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-sized forepoling construction method capable of easily and surely inserting a resin pipe into the natural ground, even when a pipe of the final end part is formed of the resin pipe. <P>SOLUTION: Before driving a long-sized steel pipe 12, after integrally driving a steel pipe 52 and a guide pipe 11 in a cutting face surface of the natural ground 50 by putting the resin guide pipe 11 such as a vinyl chloride pipe having a diameter larger than a diameter of the steel pipe 12 on the outside of the jacking assisting steel pipe 52, the steel pipe 52 is recovered, and the steel pipe 12 is inserted into the guide pipe 11, and while drilling a hole in the natural ground 50 in front of a cutting face, the steel pipe 12 is driven in the natural ground 50, and a push-cutting hole-drilling dummy pipe 16 is also connected to a rear end part of the steel pipe 12. After driving the rear end part of the steel pipe 12 up to coming to the vicinity of a tip part of the guide pipe 11, an injection double packer 30 is inserted into the steel pipe 12, and a ground solidifying agent is injected, and the surrounding natural ground 50 of the steel pipe 12 is reinforced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long tip receiving method in which a plurality of long steel pipes are placed in a natural ground in front of a face before tunnel excavation, and an injection material is injected from the steel pipe into the natural ground to reinforce the natural ground It is.

In general, when a tunnel is dug into a soft ground, a ground receiving work for reinforcing a natural ground ahead of the face is performed prior to tunnel excavation. As an example of a natural ground tip receiving method, there is an injection type long tip receiving method. As shown in FIG. 6 (a), this method uses an excavator 60 such as a drill jumbo generally used for tunnel excavation in a natural ground 50 in front of the face, and an elevation angle of about 5 degrees from the back of the support 51. A plurality of steel pipes 52 are connected while being driven, an injection pipe (not shown) is inserted into the steel pipe 52, a ground solidifying agent is injected into the natural ground 50, and the natural ground 50 is reinforced. 6 (b), the long steel pipe 53 is placed in a necessary reinforcing range (for example, an elevation angle θ is 120 degrees) along the top face of the face, and then the long steel pipe 53 is The steel pipe 53 is filled with a filler and reinforced.
When the long steel pipe 53 is driven, as shown in FIG. 7 (a), a drilling rod 13 having a drilling diameter expanding bit 13a at the tip is inserted into the steel pipe 52. Then, the other end side of the drilling rod 13 is connected to a rock drill 61 mounted on the guide cell 62 of the excavator 60, and the steel pipe 52 is inserted into the ground 50 while drilling the ground 50. Insert into. At this time, as the steel pipe 52, a steel pipe 53 having a length of about 3 m is sequentially added and a long steel pipe 53 is driven. Moreover, in order to extend and construct the support work 51, since it is necessary to remove the lower part from the support work 51 of the said steel pipe 52, in order to make removal work easy, in FIG.7 (b). As shown, the tube at the rearmost end of the long steel pipe 53 is replaced with a steel pipe 52, which is a resin-made pipe 54 such as a vinyl chloride pipe (see Patent Documents 1 and 2, for example).
JP 2000-186490 A JP 2003-155888 A

  However, when the pipe at the rearmost end is a resin pipe 54, the resin pipe 54 has insufficient strength as compared with the steel pipe 52. There was a possibility that the long steel pipe 53 could not be propelled. Therefore, it is conceivable to insert the resin pipe 54 into the natural ground 50 while pulling the long steel pipe 53 from the distal end side. In this case, the long steel pipe 53 is inserted into the distal end portion of the long steel pipe 53. The workability was poor because it was necessary to arrange a jig or the like for towing or to provide a towing means.

  The present invention has been made in view of the conventional problems, and even when the rearmost end tube is a resin tube, the resin tube can be easily and reliably inserted into the ground. The object is to provide a long tip receiving method.

In the invention according to claim 1 of the present application, prior to excavation of a tunnel, a drilling rod having a drilling bit at the distal end and connected to a rock drill is inserted inside the steel pipe. In the long tip receiving method in which the steel pipe is placed while drilling the ground in front of the face, and then the ground solidifying agent is injected into the surrounding ground from the inside of the steel pipe, Prior to installation, a guide pipe made of a resin having a diameter larger than that of the steel pipe is placed, a steel pipe is inserted into the guide pipe, a natural ground is drilled, and the steel pipe is inserted into the natural ground while being added. Then, a dummy pipe is connected to the rear end of the steel pipe, and the steel pipe is inserted into the guide pipe until the rear end of the steel pipe reaches a predetermined position in the guide pipe while pushing the steel pipe with the dummy pipe. After that, collect the drilling rod and dummy tube, and Characterized in that from the inside of the steel pipe so as to inject the soil solidifying agent around the natural ground.
According to a second aspect of the present invention, in the long tip receiving method according to the first aspect, the guide tube is placed on the outer side of the propulsion-assisting steel pipe, and the steel pipe and the guide pipe are integrally driven into a natural ground. After that, the steel pipe is collected.
The invention according to claim 3 is the long tip receiving method according to claim 1 or claim 2, wherein the steel pipe is a long steel pipe, and the guide cell on which the rock drill is mounted, There is provided a slide mechanism for sliding while supporting the long steel pipe, means for expanding and contracting the distance between the support part of the long steel pipe and the guide cell, and a mechanism for moving the guide cell up and down, and sliding the long steel pipe After the long steel pipe is inserted into the guide pipe, the guide cell is raised while reducing the distance between the support portion of the long steel pipe and the guide cell, and the drilling rod disposed in the long steel pipe And the rock drill are connected, and the long steel pipe is driven.
The invention according to claim 4 is the long tip receiving method according to claims 1 to 3, wherein the injection is applied to the connecting portion between the long steel pipe and the dummy pipe before the ground solidifying agent is injected. A double packer is inserted, and a ground solidifying agent is injected into a connection portion between the steel pipe and the dummy pipe.

According to the present invention, in the long tip receiving method, a guide pipe made of a resin having a diameter larger than the diameter of the steel pipe is placed prior to placing the long steel pipe, and the long steel pipe is placed in the guide pipe. After inserting the steel pipe into the natural ground while drilling the natural ground, connect a dummy pipe to the rear end of the steel pipe, and push the long steel pipe with the dummy pipe to the rear of the steel pipe. Insert until the end is in a predetermined position in the guide tube, preferably near the tip of the guide tube, and then collect the drilling rod and dummy tube, and from the inside of the steel tube Since the ground solidifying agent is injected into the natural ground, there is no need to propel the above-mentioned cast steel pipe with a resin pipe when driving a guide pipe which is a resin pipe as in the past. For example, after drilling a natural ground in advance, insert the above guide tube or propel If the guide pipe is put on the outside of the auxiliary steel pipe, the steel pipe and the guide pipe are driven into the ground, and then the propulsion auxiliary steel pipe is recovered, the Since the applied impact can be greatly reduced, the resin pipe connected to the rear end of the steel pipe can be surely inserted into the ground.
At this time, while making the said steel pipe into a long steel pipe, the distance of the support mechanism of the said long steel pipe, and a guide cell to slide while supporting the said long steel pipe on the guide cell in which a rock drill is mounted And a mechanism for moving the guide cell up and down, and after sliding the long steel pipe and inserting the long steel pipe into the guide pipe, the support part of the long steel pipe and the guide cell If the guide cell is raised while the distance is shortened, the drilling rod arranged in the long steel pipe is connected to the rock drill, and the long steel pipe is driven, the ready-made cutting By simply remodeling the hole device, a long steel pipe can be easily placed.
In addition, before the ground solidifying agent is injected, a double packer for injection is inserted into the connecting portion between the long steel pipe and the dummy tube, and the ground solidifying agent is injected into the connecting portion between the steel pipe and the dummy tube. By this, since the gap between the long steel pipe and the guide pipe can be closed in advance, it is possible to prevent intrusion of earth and sand and water from the gap between the long steel pipe and the guide pipe after the dummy pipe is collected.

Hereinafter, the best mode of the present invention will be described.
1 (a) to 1 (e) are schematic diagrams showing an outline of the work procedure of the long tip receiving method according to the best mode of the present invention. In this example, a long steel pipe is added while propelling the steel pipe. Instead, the case where a single long steel pipe is driven will be described.
First, as shown in FIG. 1 (a), a conventional steel pipe having a diameter larger than that of the long steel pipe 12 and a length of about 3 m is provided prior to the casting of the long steel pipe 12. The guide tube 11 having the same length is driven at an elevation angle of about 5 degrees from the back surface of the support work 51 at the position closest to the face of the natural ground 50, and a long steel tube 12 is driven using the guide tube 11 as a guide. . At this time, the entire guide tube 11 has already been driven so that the guide tube 11 is not exposed to the portion of the natural ground 50 that has not been reinforced by the long steel tube 12 already driven. It is preferable to drive into a location located on the lower side of the long steel pipe 12 (the support work 51 side).
In this example, a resin pipe such as a vinyl chloride pipe is used as the guide pipe 11. As shown in FIG. 2 (a), the same steel pipe as that normally used is used as a propulsion auxiliary steel pipe (hereinafter referred to as an auxiliary steel pipe) 52, and the guide pipe 11 is provided outside the auxiliary steel pipe 52. In addition, the auxiliary steel pipe 52 is provided with a diameter expanding bit 13a for drilling at the tip, and the base end 13b is connected to the output shaft 21a of the rock drill 21 of the drilling device 20 via the coupling 14. The rock drilling machine 13 is inserted along the guide cell 22 and the auxiliary steel pipe 52 and the guide pipe 11 are connected to each other while drilling the ground 50 in front of the face. Promote together. At this time, it is preferable to attach a shift stopper 15 with a seismic isolation device so that the hit of the rock drill 21 is not directly transmitted to the guide tube 11. Thereby, since the impact applied to the guide tube 11 can be greatly reduced, the resin guide tube 11 can be reliably inserted into the ground.
After the guide tube 11 has been placed, the slip stopper 15 is removed to recover the auxiliary steel tube 52, and the diameter of the expanded bit 13a is reduced to recover the drilling rod 13. Thereby, the resin-made guide pipe | tube 11 can be driven in the natural ground 50 ahead of a face. Note that after the guide tube 11 is placed, mouth caulking is performed with sprayed concrete to prevent the guide tube 11 from being pulled out.
Next, as shown in FIG. 1B, a long steel pipe 12 having a length of 9 m (the length is shortened in the figure) is inserted into the guide pipe 11. Specifically, as shown in FIGS. 2B and 2C, a gripping portion 23n that grips the long steel pipe 12 is mounted on a guide cell 22 on which a rock drill 21 of the drilling device 20 is mounted and slid. , 24n, and slide centerers 23, 24, which are attached to the guide cell 22 and include elevating means 23m, 24m that extend and contract the distance between the gripping portions 23n, 24n and the guide cell 22, along the guide cell 22. The holding member 25 is also installed on the upper surface of the rock drill 21 and the long steel pipe 12 is attached to the upper portion of the rock drill 21 by the slide centerers 23 and 24 and the holding member 25. Then, the rear slide centerr 24 is slid forward (face side), and the long steel pipe 12 is inserted into the guide pipe 11. At this time, a drilling rod 13 extended in advance is inserted into the inserted long steel pipe 12, and a coupling 14 for connecting to the rock drill 21 is connected to the rear end of the long steel pipe 12. Install it.

After insertion of the long steel pipe 12, as shown in FIG. 1 (c), while drilling the natural ground 50 in front of the face with the diameter expansion bit of a drilling rod (not shown) in the long steel pipe 12, the above-mentioned The long steel pipe 12 is driven into the natural ground 50. Specifically, as shown in FIG. 3A, after the rock drill 21 is slid forward and moved to the vicinity of the coupling 14, the guide cell 22 is raised by the guide cell lifting means 26. At the same time, the lifting means 23m and 24m are operated to reduce the distance between the gripping portions 23n and 24n of the slide centerers 23 and 24 and the guide cell 22, and the center of the rock drill 21 and the center of the long steel pipe 12, that is, After the heights of the output shaft 21a of the rock drill 21 and the connecting portion of the coupling 14 are matched, the position of the rock drill 21 is adjusted, and the rock drill 21 and the coupling 14 are adjusted. And connect.
During the above operation, the speed at which the distance between the gripping portions 23n, 24n and the guide cell 22 is reduced is synchronized with the rising speed of the guide cell 22 so that no excessive force is applied to the long steel pipe 12. There is a need to. Thereby, the said long steel pipe 12 and the rock drill 21 can be reliably connected, with the insertion angle of the long steel pipe 12 maintained.
Thereafter, as shown in FIG. 3B, the long steel pipe 12 is driven into the natural ground 50 by sliding the rock drill 21 forward while operating the rock drill 21.
At this stage, most of the long steel pipe 12 is inserted into the ground 50 in front of the face, but about 3 m at the rear is in the guide pipe 11. Therefore, in this example, as shown in FIG. 1 (d), a dummy tube 16 for a cut hole is connected to the rear end portion of the long steel tube 12, and the rear end portion of the long steel tube 12 is connected to the guide. The long steel pipe 12 is inserted into the guide pipe 11 and driven until it reaches a predetermined position in the pipe 11. In this example, in order to effectively use the long steel pipe 12, the rear end portion of the long steel pipe 12 is inserted until it comes close to the front end portion of the guide pipe 11.

That is, as shown in FIG. 4 (a), after removing the coupling 14 and sliding the rock drill 21 backward, the drilling rod 13 is extended and the rear end of the long steel pipe 12 is extended. The dummy tube 16 is connected to the above. And after connecting the rear-end part of the said dummy pipe 16 and the output shaft 21a of the rock drill 21 by the said coupling 14, as shown in FIG.4 (b), driving the rock drill 21 forward. The long steel pipe 12 is further inserted into the ground 50 in front of the face. Thereby, the rear end part of the long steel pipe 12 can be inserted into the ground 50 until it comes close to the front end part of the guide pipe 11. The coupling 14 may be omitted, and the long steel pipe 12 may be inserted in a state where the rear end portion of the dummy pipe 16 and the output shaft 21a of the rock drill 21 are in contact with each other.
Next, as shown in FIG.1 (e), the double packer 30 for injection | pouring is inserted in the said long steel pipe 12, and a ground solidification agent is inject | poured. 5 (a) to 5 (c) are diagrams showing details of the injection method of this example. First, an injection double packer 30 is installed at the connection portion between the long steel pipe 12 and the dummy pipe 16, and the above connection is made. After injecting the ground solidifying agent into the part, the gap between the long steel pipe 12 and the guide pipe 11 is closed in advance, and the treatment to prevent the intrusion of earth and sand from the gap between the long steel pipe 12 and the guide pipe 11, The double packer 30 is moved into the long steel pipe 12 and solidified into a ground 50 around the long steel pipe 12 from the injection hole 12h with a check valve provided in advance on the side surface of the long steel pipe 12. An earth agent 50 is injected to reinforce the natural ground 50.
Thereafter, the double packer 30 and the dummy pipe 16 are collected, and a filler is injected into the long steel pipe 12 using a vinyl chloride pipe 17 for filling the steel pipe. Finally, the guide tube 11 placed at a position corresponding to the lower part is removed from a support not shown in the figure by cutting or the like to construct the next support. Since the guide tube 11 is a resin tube such as a vinyl chloride tube, the removal operation can be easily performed.

Thus, according to this best mode, prior to placing the long steel pipe 12, the resin guide pipe 11 such as a vinyl chloride pipe having a diameter larger than the diameter of the long steel pipe 12 is provided. The guide tube 11 is put on the outside of the steel tube 52 for propulsion assistance, and the steel tube 52 and the guide tube 11 are integrally driven into the face of the ground 50, and then the auxiliary steel tube 52 is recovered, and the guide tube 11, the long steel pipe 12 is inserted into the ground 11, and the above-mentioned long steel pipe 12 is driven into the natural ground 50 while drilling the ground 50 in front of the face, and further pushed into the rear end of the long steel pipe 12. A dummy pipe 16 for drilling is connected and the rear end portion of the long steel pipe 12 is driven until it comes close to the tip end portion of the guide pipe 11, and then the double packer for injection is inserted into the long steel pipe 12. 30 is inserted and ground solidifying agent is injected, and the natural ground 50 around the long steel pipe 12 is Since so as to strongly, since it greatly reduces the impact applied to the guide tube, it is possible to insert the resin guide tube 11 connected to the rear end portion of the elongated steel pipe 12 to ensure that the earth Yamauchi. Further, even a single long steel pipe 12 can be placed with high accuracy. Moreover, since the connection work of the steel pipe can be omitted, the work efficiency is greatly improved.
Further, when the long steel pipe 12 is inserted into the guide pipe 11, the guide cell 22 is provided with elevating means 23 m and 24 m for expanding and contracting the distance between the gripping portions 23 n and 24 n for holding the long steel pipe 12 and the guide cell 22. The attached slide centerers 23 and 24 are attached, and the long steel pipe 12 is inserted into the guide pipe 11 while being supported on the top of the rock drilling machine 21. After the insertion, the gripping portions 23n and 24n and the guide cell 22 are inserted. The guide cell 22 is raised while reducing the distance between the long steel pipe 12 and the rock drill 21 and the long steel pipe 12 is driven. The long steel pipe 12 can be easily driven only by remodeling.

In the above-mentioned best mode, when the resin guide tube 11 is driven, the guide tube 11 is placed outside the auxiliary steel tube 52, and the auxiliary steel tube 52 and the guide tube 11 are integrated into the ground 50. However, if the method of driving with less impact applied to the resin-made guide tube 11 such as inserting the guide tube 11 after drilling a natural ground in advance, other methods may be used. A method may be used.
In the above example, the slide centerers 23 and 24 are attached to the guide cell 22 of the hole drilling device 20 when the long steel pipe 12 is inserted and placed, but two types of hole drilling devices are prepared, If a ready-made drilling device is used for driving the guide tube 11 and a drilling device in which the slide center risers 23 and 24 are attached in advance is used for inserting and driving the long steel tube 12, work efficiency can be improved. Further improvement can be achieved.
In the above example, the case where the long steel pipe 12 having a length of about 9 m is inserted into the ground has been described. However, the present invention can also be applied to a case where a normal steel pipe is added to form a long steel pipe. Needless to say. However, if the long steel pipe 12 is used as in this example, the structure of the steel pipe is simplified because the steel pipe is not added, and therefore, it is possible to manufacture the steel pipe at a low cost since it does not require processing effort. Since there is an advantage, it is preferable to use the long steel pipe 12.
Further, even when one long steel pipe 12 is used, the length is not limited to the above length, and is appropriately set depending on the size of the tunnel, the stroke length of the drilling device 20 to be used, and the like. The

  As described above, according to the present invention, even when the rearmost end tube is a resin tube, the resin tube can be easily and surely inserted into the ground, so that workability is improved. As well as the construction period can be shortened.

It is a schematic diagram which shows the outline | summary of the work procedure of the elongate tip receiving method concerning the best form of this invention. It is a figure which shows the casting method of the long steel pipe which concerns on this best form. It is a figure which shows the casting method of the long steel pipe which concerns on this best form. It is a figure which shows the casting method of the long steel pipe which concerns on this best form. It is a figure which shows the injection | pouring method of the chemical | medical agent which concerns on this best form. It is a figure which shows the outline | summary of the conventional long tip receiving method. It is a figure which shows the conventional casting method of a long steel pipe.

Explanation of symbols

11 guide pipe, 12 long steel pipe, 12h injection hole with check valve, 13 drilling rod,
13a Expanding bit, 13b Base end of drilling rod, 14 Coupling,
15 Displacement stopper, 16 Dummy pipe for punching hole,
20 drilling device, 21 rock drill, 21a output shaft, 22 guide cell,
23, 24 Slide Centrizer, 23m, 24m Lifting means,
23n, 24n Slide centerer gripping part, 25 holding member,
30 Double packer, 50 Ground, 51 Supporting work, 52 Steel pipe for propulsion assistance.

Claims (4)

  Prior to excavation of the tunnel, a drilling rod with a drilling bit at the tip and a base end connected to a rock drill is inserted inside the steel pipe to drill the ground in front of the face. However, in the long tip receiving method of injecting a ground solidifying agent into the surrounding ground from the inside of the steel pipe, after the steel pipe is placed, prior to the placing of the steel pipe, from the diameter of the steel pipe After inserting a steel pipe into the guide pipe, drilling the ground and inserting the steel pipe into the ground while adding the steel pipe, the rear end of the steel pipe A dummy pipe is connected to the part, and while pushing the steel pipe with the dummy pipe, the steel pipe is inserted into the guide pipe until the rear end of the steel pipe comes to a predetermined position in the guide pipe. Collect the drilling rod and dummy tube, and surround them from the inside of the steel tube. Elongate destination 受工 method being characterized in that so as to inject the soil solidifying agent to the natural ground.   The steel pipe is collected after the guide pipe is covered on the outside of the steel pipe for auxiliary propulsion, and the steel pipe and the guide pipe are driven into a natural ground integrally. Long tip receiving method.   The steel pipe is a long steel pipe, and the distance between the slide mechanism that slides while supporting the long steel pipe on the guide cell on which the rock drilling machine is mounted, and the distance between the support part of the long steel pipe and the guide cell is expanded and contracted. And a mechanism for moving the guide cell up and down, and after sliding the long steel pipe and inserting the long steel pipe into the guide pipe, the distance between the support part of the long steel pipe and the guide cell is increased. The guide cell is raised while being contracted to connect a drilling rod and a rock drill disposed in the long steel pipe, and the long steel pipe is driven. The long tip receiving method according to claim 1 or claim 2.   Before injecting the ground solidifying agent, a double packer for injection is inserted into the connecting portion between the long steel pipe and the dummy tube, and the ground solidifying agent is injected into the connecting portion between the steel pipe and the dummy tube. The long tip receiving method according to any one of claims 1 to 3, wherein:

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