JP2005061087A - Feed pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feed pipe in which the broken piece of the feed pipe after a tunnel excavation is removed and recovered easily irrespective of a breaking direction by forming a plurality of notched pores in the peripheral direction at the place of a breaking. <P>SOLUTION: In the feed pipe 1 being used for reinforcing a natural ground by a grouting in the case of the tunnel excavation and forming a section to be broken at the specified place of a pipe body, the notched pores 12 are formed to the section to be broken 14, and a plurality of the pores 12 are formed along the peripheral direction of the peripheral wall of the feed pipe 1. Accordingly, since the feed pipe can be broken at the place of the arbitrary notched pore, the feed pipe can be broken by selecting the direction of the most excellent workability as the bending direction in the case of the breaking. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an injection pipe that is inserted into a natural ground for reinforcement of a face surface or a top end portion when excavating a tunnel.

  For example, in tunnel excavation, a mirror lock bolt may be used to reinforce a soft face. This mirror lock bolt has a hollow structure and is also an injection pipe capable of injecting grout. The ground rock can be consolidated and reinforced by discharging the grout from its tip and penetrating into the natural ground.

  Such mirror lock bolts are driven into the face before excavation to reinforce the natural ground, but as the tunnel excavation proceeds, the mirror lock bolts are exposed one after another from the newly formed face, so this is exposed. The excavation work will proceed while cutting and removing the cut.

  As a material of the mirror lock bolt, for example, FRP, steel pipe, vinyl chloride, glass fiber, or the like is used.

  An example of the case where this mirror lock bolt is installed will be described. First, a bolt insertion hole is drilled in the face of a tunnel to be excavated, and a reinforcing material filling pipe is inserted into this bolt insertion hole.

Next, the reinforcing material filling pipe is pulled out while filling the bolt insertion hole with a reinforcing material such as mortar using the reinforcing material filling pipe. Thereafter, the mirror lock bolt is inserted into the bolt insertion hole filled with mortar. And as tunnel excavation progressed, the mirror lock bolt was exposed from the face, so it was cut off and removed.
JP-A-4-357293

  However, the work of breaking the mirror lock bolt is troublesome because it is processed one by one.

  In addition, conventionally, the cut-in pores are formed on the peripheral wall of the mirror lock bolt. However, since the position is limited, the direction in which the cut can be broken is also limited. As a result, it is difficult to easily break the mirror lock bolt depending on the direction and position of the cut pore. For example, when the cut pore is located on the side in contact with the natural ground, it is difficult to break the mirror lock bolt because it is not possible to secure a space for folding the mirror lock bolt.

  In such a case, extra work such as excavating a natural ground that is in contact with the cut pores to form a predetermined space is required, which hinders speeding up of the tunnel excavation work.

  An object of the present invention has been made to solve the above-described problems, and by providing a plurality of cut pores in the circumferential direction at the break point, the break direction is not limited, and injection after tunnel excavation is performed. It is an object of the present invention to provide an injection pipe that is easy to remove and collect a folded piece of pipe.

  The present invention is configured as follows to solve the above problems. That is, it is used to reinforce natural ground by injecting grout during tunnel excavation, and in the injection pipe in which the cut portion is formed at a predetermined position of the pipe body, a cut pore is formed in the cut portion, The cut pores are provided at a plurality of locations along the circumferential direction of the peripheral wall of the injection pipe.

  In the injection pipe, the part to be cut is formed by a cut pore (slit) provided in a peripheral wall of the pipe body. By providing several places at predetermined intervals in the circumferential direction, the direction in which the pipe is bent and cut is not limited. That is, an arbitrary cut pore can be selected and the injection pipe can be bent at that position to be broken. Therefore, it is possible to break the injection pipe after selecting the direction with the best workability as the bending direction at the time of breaking.

  If the injection pipe is used, when the part of the injection pipe exposed from the inner surface of the tunnel is cut from the broken part by excavation of the tunnel after being inserted into the ground, there is a restriction due to the positional relationship with the ground. Work can be carried out without receiving it.

  In addition, the natural ground of the tunnel includes a face surface or a top end portion.

  Further, the injection pipe may be provided with cut pores that penetrate so that the opening area of the outer peripheral surface of the pipe and the opening area of the inner peripheral surface are substantially the same.

  The cut hole may be formed by cutting a part of a peripheral wall having a predetermined thickness into an arc shape with respect to a substantially circular cross section of the injection pipe. In this case, since the outer wall is largely removed, it is easy to break.

  The cut pores are formed by cutting along a line extending radially from the center or near the center, and the opening area of the outer peripheral surface can be larger than the opening area of the inner peripheral surface.

  The cut pores may be provided at a predetermined interval in the circumferential direction, and a groove that extends in the circumferential direction and forms a thin portion may be formed between the cut pores. In this way, since the bending force at the portion where the cut pores are formed concentrates on the groove, it can be easily cut along the groove.

  As the material of the injection pipe, for example, FRP, steel pipe, vinyl chloride, glass fiber, or the like can be used.

  The position and number of the cut pores are preferably provided at three or four positions on the circumference at equal intervals, but the position and number are not particularly limited. The cut pores can have various forms, and the length, width, and number thereof can be freely set. For example, as in a normal break line (cut line), cut pores may be provided around the injection pipe at a predetermined interval.

  As described above, those in which the strength of the injection pipe is variously set by changing the number and shape of the cut pores according to the strength of the natural ground and other conditions can be appropriately selected and used. In addition, the strength of the injection pipe is greatly affected by how much non-breaking parts that are not provided with cut pores remain, so the number of cut pores and the setting of the length should be changed quantitatively. Thus, the strength setting of the injection pipe can be easily controlled.

  Furthermore, the intensity | strength of a to-be-cut part can also be controlled by changing the process shape at the time of forming an incision pore, such as the extent of cutting of an outer peripheral wall (thickness adjustment) as mentioned above.

  In the injection pipe according to the present invention, when the position of the broken portion is made to correspond to the length of one tunnel dug, the broken positions of the plurality of injection pipes inserted into the ground are formed after the tunnel excavation. It can be made to coincide with the surface of the natural ground, and in this way, the injection pipe is not broken inside the natural ground, so that the natural ground can be prevented from peeling off. Further, in this case, since the folded piece of the injection pipe becomes long, it can be easily recovered.

  According to the present invention, the injection direction is not limited, and an injection pipe that can be quickly broken after tunnel excavation without extra work can be obtained.

  Hereinafter, an injection pipe according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an entire injection pipe 1 according to the present invention. The injection pipe 1 is provided with a connecting screw 11 at one end of a steel pipe body 10 having an appropriate diameter and length, and the peripheral wall of the pipe body 10 is used for injecting a reinforcing material at an appropriate position. A plurality of injection holes 13 are provided. A plurality of cut portions 14 are provided on the outer peripheral surface of the pipe body 10.

  In the present embodiment, as shown in the cross-sectional view of FIG. 2, the cut portion 14 is provided with cut pores 12, and the cut pores 12 are formed at three substantially equal intervals on the circumference. .

  In this case, you may make it set the breaking strength of the to-be-fractured part 14 according to the characteristic of the natural ground into which the injection pipe 1 is inserted. As shown in FIG. 4, the breaking strength of the cut portion 14 can be controlled by changing the width b, depth h, or length L (FIG. 3) of the cut pore 12.

  The cut pores 12 are provided at a predetermined interval in the circumferential direction, and a groove 13 is formed between the cut pores 12 and extends in the circumferential direction to form a thin portion. Since the bending force at the time of cutting is concentrated in the groove 13, the injection pipe 1 is easily cut along the groove 13.

  As shown in FIG. 3, the injection pipe 1 may be provided with cut pores A penetrating so that the opening area of the outer peripheral surface of the pipe and the opening area of the inner peripheral surface are greatly different.

  The cut hole A is formed by cutting a part of the peripheral wall 1a having a predetermined thickness into a circular arc shape with respect to a cross section of the substantially circular injection pipe 1. In this case, since the outer wall is removed in a wide range, the injection pipe 1 can be easily broken.

  The cut pores B and D in FIG. 3 are formed by being cut along a line (indicated by a broken line in the figure) extending radially from the center of the injection pipe 1 or near the center, and the opening area of the outer peripheral surface is internal. It is larger than the opening area of the peripheral surface.

  Further, the cut pore C is provided with a through hole that is cut substantially in parallel so that the opening area of the outer peripheral surface of the injection pipe 1 and the opening area of the inner peripheral surface are substantially the same.

  Usually, it is preferable to provide three or four cut pores at equal intervals on the circumference, but the position and number are not particularly limited.

  As described above, the cut pores 12 can be freely determined within a range in which a predetermined effect is produced. However, since the strength of the part to be cut can be easily controlled by changing its shape and dimensions, the number and shape of the cut pores 12 are changed depending on the strength of the ground and other conditions, and the strength of the injection pipe It is preferable to select and use variously set values.

  Further, in the present embodiment, when the injection pipe 1 is inserted into a natural ground of the tunnel, the broken portion 14 is not broken by the earth pressure received from the natural ground, and the folded portion 14 is broken. In some cases, it is preferable to control the strength so that the surrounding ground is not loosened by the force applied for breaking.

When setting the strength of the cut portion 14, the characteristics of the natural ground are obtained by, for example, measuring earth pressure, and the strength of the cut portion 14 is calculated in accordance with a normal calculation method in consideration of this result. Good.

  By the way, the position where the broken part 14 is provided in the axial direction of the injection pipe 1 is set according to the excavation length of one excavation at the time of tunnel excavation. That is, from the opposite end of the screw 11 of the injection pipe 1, a broken portion 14 is provided for each excavation length of one tunnel excavation (for example, one cycle of a shield machine). When the injection pipe 1 is used as a single item, the connecting screw 11 can be omitted.

  Next, an example of a method for reinforcing a tunnel ground using the above-described injection pipe 1 will be described. The injection pipe 1 is made of steel, and an example in which the injection pipe 1 is applied to a face surface will be described with reference to FIGS.

  Here, the case where the injection pipe 1 is inserted into the natural ground by the push-in method will be described, but the injection pipe 1 of the present invention can also be applied to the case where the injection pipe 1 is inserted into the natural ground by another method such as a pull-in method. it can.

  In this method of reinforcing the face surface, the injection pipe 1 is inserted into the face surface 70a using a punch 31 as shown in FIG. The punching machine 31 is formed as a drifter and is installed on the guide slide 33 so as to be slidable back and forth. A centizer 34 is erected at the tip of the guide slide 33.

  A sleeve 38 is screwed to the rotary shaft 32 of the punching machine 31. The rear end of the rod 41 having screws (not shown) at both ends is screwed to the front end of the sleeve 38. A drill bit 46 is screwed to the tip of the rod 41 as shown in FIG.

  As shown in FIG. 7, the drill bit 46 has a head stem 47, and a protrusion 48 is provided at the base of the head stem 47. Further, the head stem 47 is provided with a rotation pin 49 as shown in FIG. 8, and the head sleeve 50 fitted on the head stem 47 cannot rotate with respect to the head stem 47 and has a predetermined range. It is externally fitted so that it can slide back and forth.

  A pilot bit 53 is provided at the tip of the head sleeve 50. Further, the head sleeve 50 is provided with a diameter expanding bit 51. The diameter-expanding bit 51 protrudes to the side of the head sleeve 50 at a position where the head stem 47 is pushed into the head sleeve 50 as shown in FIG. 7, and the head stem 47 is pulled out from the head sleeve 50 as shown in FIG. It is formed so as to fit in the head sleeve 50 at the position.

  A front blow hole 54 is provided at the center of the tip of the pilot bit 53, and a lateral blow hole 55 facing in a right angle direction and a rear blow hole 56 facing obliquely rearward are provided on a side surface. In addition, the drill bit 46 can omit the diameter expansion bit 51 when the ground is soft. This is because when the natural ground is soft as described above, the diameter of the hole 71 (FIG. 17) drilled at the tip of the pilot bit 53 can be increased by the lateral blow ejected from the lateral blow hole 55.

  As shown in FIG. 9, the pipe insertion tool 65 into which the rod 41 of FIG. 5 is rotatably inserted has the same outer diameter as the outer shape of the injection pipe 1, and its tip is formed in the small diameter portion 66. ing. Thereby, the small diameter part 66 of the pipe insertion tool 65 can be inserted into the rear end of the injection pipe 1. On the contrary, the pipe insertion tool 65 can be fitted to the rear end of the injection pipe 1 by forming the tip of the pipe insertion tool 65 with a large diameter and forming the inner surface thereof in a tapered shape.

  When the drilling machine 31 configured in this way is installed, the sleeve 38 is retracted to the rear end of the guide slide 33 as shown in FIG. Next, as shown in FIG. 11, the rod 41 is inserted into the centizer 34, and the rear portion of the rod 41 is rotatably inserted into the pipe insertion tool 65. Then, as shown in FIG. 12, the rear end of the rod 41 is screwed to the sleeve 38 via the pipe insertion tool 65, and the drill bit 46 is screwed to the tip of the rod 41.

Next, as shown in FIG. 13, with the diameter-enlarged bit 51 housed in the drill bit 46 (FIG. 8), the injection pipe 1 is fitted onto the rod 41, and the rear end of the injection pipe 1 is connected to the pipe insertion tool 65. Are fitted onto the small-diameter portion 66 at the tip of the screw and screwed.
(Steps 1 and 2)
Subsequently, as shown in FIG. 14, the punching machine 31 is disposed at a predetermined drilling position immediately before the face surface 70a. Next, as shown in FIG. 15, the rod 41 and the drill bit 46 (FIG. 14) are rotated while the rod 41 (FIG. 13) and the injection pipe 1 are advanced while the guide slide 33 of the drill 31 is extended. Hole 71 is drilled in natural ground 70.
(Process 3)
In the perforation by the perforation bit 46, as shown in FIG. 16, the slime 72 generated by the perforation by the rotation of the pilot bit 53 is sent backward by a front-facing blow ejected from the front blow hole 54 (FIG. 7). Further, the perforated hole 71 is enlarged by a lateral blow ejected from the lateral blow hole 55 (FIG. 7).

  Furthermore, the hole 71 expanded by the horizontal blow is pierced into the expanded cylindrical shape by the diameter expanding bit 51 (FIG. 7). The slime 72 generated by the previous drilling is sent out to the outside of the hole 71 by the backward blow ejected from the backward blow hole 56.

After the drilling of the hole 71 is completed in this way, as shown in FIG. 16, in order to discharge the slime 72 in the injection pipe 1, the rotation of the rod 41 is not stopped and the drill bit 46 (FIG. 17) is The drilling machine 31 is moved backward until the end reaches the mouth of the hole 71, the rod 41 is extracted, and the slime 72 is discharged.
(Steps 4 and 5)
And as shown in FIG. 17, the rod 41 is completely extracted from the hole 71, and the rod 41 and the pipe insertion tool 65 (FIG. 16) are collect | recovered. At this time, the injection pipe 1 is left behind in the hole 71 at the back of the mouth. Thereby, the drilling of the hole 71 and the installation of the injection pipe 1 for injecting the reinforcing material are completed. Similarly, a plurality of injection pipes 1 are installed on the face surface 70a as shown in FIG.

Here, in order to insert the injection pipe 1 into the ground 70, the injection pipe 1 is drawn into the hole 71 at the same time while the hole 71 is drilled with the drill bit 46 in front of the injection pipe 1. Even if the broken part 14 is provided, the broken part 14 is not broken during insertion.
(Step 6)
When the installation of the injection pipe 1 is completed, for example, cement milk is injected as a reinforcing material into the natural ground 70 through the injection pipe 1 as shown in FIG. Thereby, the injection pipe bolt 90 is formed in the natural ground 70.
(Step 7)
Thereafter, as shown in FIG. 20, the tunnel 85 is excavated by one excavation, and the face surface 70a advances by the excavation length L. Thereby, the part after the first folding part 14 of the injection pipe 1 inserted in the natural ground 70 is exposed from the face surface 70a. Therefore, a predetermined force is applied to the exposed rear end edge of the injection pipe 1 to be cut off from the cut portion 14. The folded piece 1a is considerably larger than the conventional one.

  Next, concrete is sprayed on the wall of the tunnel 85 to form a concrete lining 91. In the same manner, the excavation of the tunnel 85 by one excavation, the breakage of the injection pipe 1 from the cut portion 14 and the formation of the tunnel lining 91 are repeated. When all the injection pipes 1 embedded in the ground 70 are removed, another injection pipe 1 is embedded and the same processing as described above is performed.

  As described above, according to the self-piercing face face stabilization method, since the injection pipe 1 is made of steel, it is not deformed even when subjected to earth pressure of the natural ground 70, so that the natural ground 70 can be prevented from loosening. Moreover, since the strength of the part 14 to be cut of the injection pipe 1 is set so as not to be broken by the earth pressure received from the ground 70 and the ground 70 is not loosened by the force applied at the time of the breaking, It can prevent that the natural ground 70 peels off at the time of a break.

  Further, since all the injection pipes 1 are broken at the same position almost coincident with the face surface 70a and are not broken inside the natural ground 70, the natural ground 70 is not peeled off, thereby the face face 70a. Can be stabilized. In addition, since the folded piece 1a of the injection pipe 1 is relatively long, it can be easily recovered even if it is mixed in the excavation drill, and industrial waste can be prevented from being mixed in the excavation drill.

  The above-described reinforcement of the tunnel ground using the injection pipe 1 can be applied to the top end of the tunnel and other places of the ground.

  This method for reinforcing the top end also has the effects of stabilizing the natural ground and preventing industrial waste from being mixed into the excavation shear, as in the above-described method of reinforcing the face.

The application of the injection pipe 1 of the present invention is not limited to the self-piercing face face stabilization method described above. It can be widely applied as an injection pipe to be inserted into a natural ground for reinforcement of a face face or a top end portion in normal tunnel excavation.

It is a figure which shows the injection pipe of this invention. It is sectional drawing which shows the to-be-cut part of the injection pipe of this invention. It is sectional drawing which shows the variation of the notch pore formed in an injection pipe. It is sectional drawing which shows the magnitude | size of the incision pore of the injection pipe of this invention. It is a figure which shows the punching machine which forms the hole which inserts an injection pipe. It is a figure which shows the rod of a drilling machine. It is a figure which shows the accommodation state of the punch bit of a punch. It is a figure which shows the distraction state of the punch bit of a punch. It is a figure which shows the pipe insertion tool of a drilling machine. It is a figure which shows the installation state of a punch. It is a figure which shows the mounting state of the rod of a drilling machine, and a pipe insertion tool. It is a figure which shows the attachment state of the drill bit of a punch. It is a figure which shows the mounting method of a punch and an injection pipe. It is a figure explaining the process 1 of the self-piercing type face surface stabilization construction method. It is a figure explaining the process 2 of the self-piercing type face surface stabilization construction method. It is a figure explaining the process 3 of the self-piercing type face surface stabilization construction method. It is a figure explaining the process 4 of the self-piercing type face surface stabilization construction method. It is a figure explaining the process 5 of the self-piercing type face surface stabilization construction method. It is a figure explaining the process 6 of the self-piercing type face surface stabilization construction method. It is a figure explaining the process 7 in the self-piercing type face face stabilization method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection pipe 12 Cut hole 14 Fracture part 70 Ground mountain 70a Face face 85 Tunnel

Claims (5)

In the injection pipe that is used to reinforce the natural ground by injecting grout during tunnel excavation, and in which the bent part is formed at a predetermined position of the pipe body,
An injection pipe characterized in that cut pores are formed in the bent portion, and the cut pores are provided at a plurality of locations along the circumferential direction of the peripheral wall of the injection pipe.   The injection pipe according to claim 1, further comprising a cut-in fine hole penetrating so that an opening area of the outer peripheral surface of the pipe and an opening area of the inner peripheral surface are substantially the same.   2. The injection pipe according to claim 1, wherein the cut pore is formed by cutting a part of a peripheral wall having a predetermined thickness into an arc shape with respect to a substantially circular cross section of the injection pipe.   The cut hole is formed by cutting along a line extending radially from the center or near the center, and an opening area of the outer peripheral surface is larger than an opening area of the inner peripheral surface. Injection pipe.   The injection pipe according to any one of claims 1 to 4, wherein the cut pores are provided at a predetermined interval in the circumferential direction, and a groove extending in the circumferential direction is formed between the cut pores.

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