JP4116730B2 - Tunnel long end receiving method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Prior to excavation work, the present invention is designed to place a long receiving member consisting of a long steel pipe, etc., sequentially around the tunnel cross section in front of the face, to prevent loosening and settlement of the natural ground. This is related to a long-point receiving method for tunnels. More specifically, for example, the present invention relates to a tunnel long tip receiving method that improves construction safety while combining a 10 to 20 m long receiving member and a 2 to 4 m short injection tubular member.
[0002]
[Prior art]
Conventionally, as this type of long tip receiving method, a large number of long receiving members, such as long steel pipes, are placed around the tunnel cross section, and the inner hollow portion of the long receiving member is placed. A tunnel excavation method in which excavation work is carried out while reinforcing a natural ground by injecting a curable filler through the reinforced material and hardening the periphery is widely known. As a method for placing the long member for receiving the tip, there is known a method in which the long member for receiving is placed to a predetermined depth while being drilled by a perforating bit attached to the tip. In this case, an appropriate number of tubular members may be added as necessary to use as a long member for receiving the desired length. And, when the operation of placing the front receiving long member on the ground is completed, for example, the perforating bit is reduced and taken out together with the perforating rod through the inner hollow portion of the front receiving long member, Thereafter, a method is generally employed in which a curable filler is injected from the tip portion to the periphery through the inner hollow portion of the long member for receiving. Further, a mouth injection tube is installed in a gap portion between the mouth portion of the long end receiving member and a hole wall around the mouth portion, and a curable filler is injected from the mouth portion. That is, the injection of the curable filler to the periphery of the long member for receiving is dependent on the geology of the ground, but the injection from the tip portion is performed through the inner hollow portion of the long member for receiving. The injection from the mouth part is performed through the mouth injection pipe.
[0003]
[Problems to be solved by the invention]
However, since the long member for receiving is as long as 10 to 20 m, for example, even if the filler is injected from both the front end and the mouth, it is technically possible to inject the intermediate part accurately. Not easy. For this reason, there may be a portion in the intermediate portion that is not sufficiently reinforced by the filler. Moreover, depending on the geology of the natural ground, the hole wall formed by the drilling of the drilling bit may collapse, and it may be difficult to insert the mouth injection tube into the mouth portion of the long member for receiving. In such a case, the insufficiently injected portion of the filler further spreads from the middle part to the mouth part of the long member for receiving, and has a serious problem in the ground reinforcement necessary for ensuring the safety of construction. It will be.
[0004]
The present invention has been made in view of the conventional circumstances as described above, and while maintaining the advantages of the long tip receiving method implemented using a long tip receiving long member, the tip receiving long length is achieved. An object of the present invention is to provide a long tunnel tip receiving method that can accurately perform ground reinforcement around a member and can improve the safety of construction.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention sequentially places a long receiving member having a self-drilling bit at the end at the periphery of the tunnel cross section at appropriate intervals prior to tunnel excavation work, to strengthen the periphery of the tunnel cross section by the elongated member, successively pouring the infusion tubular member of short to reach near the periphery of the destination BEARING long member of the punching設済, via infusion necessity tubular member The technical means of carrying out the excavation work while injecting and reinforcing a curable filler around the front receiving long member was adopted. By adopting this technical means, according to the present invention, it is necessary to reinforce the periphery of the long member for receiving , while adopting the advantage that the ground can be effectively strengthened over a wide range of the long member for receiving. Since a method of injecting a filler by injecting a short injection tubular member into the portion, it is possible to accurately inject a curable filler into a necessary portion over the entire length of the long member for receiving. The construction safety is improved because the periphery of the tunnel cross section is reinforced accurately. Further, when the long member for receiving the receiver is placed around the tunnel cross section, a curable filler is injected from the tip portion through the inner hollow portion of the long member for receiving, or the receiving member Install a mouth injection tube around the mouth of the long member and inject a curable filler from the mouth through the mouth injection tube. Thus, it is also possible to apply the above-described method of injecting a filling material by placing an injection tubular member.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be widely applied as long as it is a construction method using a long receiving member having a self-drilling bit at the tip. As the specific form of the self-piercing bit, various types of bits can be applied, and a type that is attached to the tip of the long member for receiving itself and is driven to rotate through the tubular member is also possible. It may be of the type that is attached to the tip of a perforating rod inserted through the inner hollow part of the long member for receiving and is rotationally driven through the rod. Moreover, the type which collect | recovers the bits for self-piercing | punching may be sufficient, and the type which is left unfilled may be sufficient. Further, with respect to how the infusion of a curable filler to the peripheral of the preceding BEARING elongated member, may be adopted a method that is injected through the front Symbol injection tubular member in respect of all of the filler, which will be described later As in the embodiment, the filler is injected from the tip portion through the inner hollow portion of the long member for receiving, or the filler is injected from the mouth portion through the mouth injection tube. However, it is also possible to employ a technique in which an injection tubular member is provided to replenish the filler in a portion where the filler is likely to be insufficient. As for the injection of the curable filler carried out through the inner hollow portion of the long member for receiving, the curable filler may be injected using the inner hollow portion itself as a flow path, As in the embodiments described later, the injection tube may be inserted into the inner hollow portion and injected through the injection tube. Further, as the curable filler, it is possible to use a cement-based material or a resin-based material having good permeability such as urethane. Furthermore, an appropriate number of the above-mentioned long members for receiving can be used as needed. Also, specific structure and pouring positions of the injection tubular member of the short length, with respect to such striking設方method is not particularly limited, possible injection of curable filler for the periphery of the destination BEARING elongated member Any form is acceptable.
[0007]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view illustrating a state in which a long member for receiving is used for a long receiving method for a tunnel according to the present invention. In the figure, reference numeral 1 denotes a long member for receiving, and in this embodiment, the filler is injected from the tip through the inner hollow portion of the long member 1 for receiving as described later. Yes, but not necessarily. The pre-receiving elongate member 1 is configured to extend its entire length by connecting an appropriate number of tubular members using the connecting member 2. A self-drilling bit 3 of an appropriate type is screwed to the distal end portion of the long receiving member 1 of this embodiment through a male screw formed on the outer peripheral surface of the long receiving member 1 as shown in the figure. Has been. Further, an injection tube support member 4 is mounted on the inner side of the distal end of the long member 1 for receiving, and one end portion of the injection tube 5 of the filler is inserted into a support hole formed in the axial center portion. Thus, the self-drilling bit 3 can be supported in a state where it is communicated with the passage 6 formed in the self-drilling bit 3. The injection tube 5 may be set in advance in the inner hollow portion of the long member 1 for receiving prior to placing the long member 1 for receiving in front of the natural ground 7 as described above. It may be set after placing. Further, if the tapered portion for guiding the end of the injection tube 5 to the support hole is formed on the end surface portion of the injection tube support member 4 as shown in the figure, the setting operation of the injection tube 5 can be simplified.
[0008]
Thus, in the case where the long member 1 for receiving the receiver is driven against the natural ground 7, in this embodiment, it is rotated to the self-drilling bit 3 at the tip via the long member 1 for receiving itself. Placing it to the desired depth while drilling itself with force and striking force. Then, when the operation of placing the long member 1 for receiving on the ground 7 is completed, the operation is shifted to the filling material injection operation. In this embodiment, the filling material is injected through the injection pipe 5 and the passage 6 formed in the self-drilling bit 3, and the mouth portion of the elongate receiving member 1 and the hole wall 8. It is carried out through the mouth injection tube 9 installed in the gap portion. By this injection operation, a curable filler is injected through the passage 6 from the front end portion of the self-piercing bit 3 or the periphery to the vicinity of the front end portion of the long member 1 for receiving. The injected filler penetrates into and cures the gap between the long member 1 for receiving and the hole wall 8 and the surrounding natural ground 7 and strengthens the surrounding ground. Similarly, the filler injected through the mouth injecting tube 9 penetrates into the gap between the mouth portion of the elongate receiving member 1 and the hole wall 8 and the surrounding natural ground 7 and hardens. Will strengthen the ground. However, as described above, since the long member 1 for receiving is as long as, for example, 10 to 20 m, even if the filling material is injected from both the tip and the mouth, It is not technically easy to accurately inject the middle portion, and there may be a portion where the filler does not sufficiently spread. Further, depending on the geology of the natural ground, the hole wall 8 formed by the drilling of the drilling bit 3 may collapse, and the mouth injection tube 9 cannot be installed, and the portion where the filling material is not sufficiently injected. May spread to the mouth of the long member 1 for receiving.
[0009]
Next, features of the present invention will be described. 2 to 4 are construction explanatory views schematically showing one cycle of the work cycle when the long member 1 for receiving is used. FIG. 2 shows the midway of the excavation work. The cutting face portion 10 advances to the vicinity of the tip of the pre-receiving long member 1a previously placed, and the next pre-receiving long member 1b is newly hit. It shows a construction state in which a curable filler is injected. In the figure, 11 is the filler injected last time, 12 is the filler at the tip injected through the inner hollow part of the previously-received long member 1b, and 13 is also injected this time. In addition, each of the fillers injected through the mouth injection pipe (not shown) installed at the mouth portion of the long member 1b for receiving the tip is shown. The front receiving elongate member 1b placed this time is in a state where both side portions are supported by the filler 13 at the mouth portion and the filler 12 at the tip portion, but the filler does not reach the intermediate portion. There is a part, and the reinforcement of the ground in that part is not sufficient. The long receiving member 1b is placed in an inclined state so that the front is slightly upward as shown.
[0010]
FIG. 3 shows a construction state in which the excavation work has advanced to the intermediate face 14. In this case, in the process of proceeding from the construction state of FIG. 2 to the construction state of FIG. 3, as shown in FIG. 3, according to the progress state of the excavation work, the tip placed at this time located in front of the face portion 14. A short injection tubular member 15 is driven to reach the vicinity of an intermediate portion or the like where the filler of the receiving long member 1b is insufficient, and the filler is inserted through the injection tubular member 15. A construction method is adopted in which the excavation work is carried out while reinforcing the ground by injecting 16. In the figure, 17 is a support work made of steel or the like.
[0011]
Furthermore, as for the lack of easy part filling material before Symbol destination BEARING long member 1b will repeat the reinforcing work of injecting the filling material 19 to Da設a short infusion tubular member 18, eventually the The filler 12 injected from the tip of the long member 1b for receiving is approached, and the surrounding ground is accurately strengthened over the entire length of the long member 1b for receiving. When the excavation work proceeds in this way and the face portion 20 advances to the vicinity of the distal end portion of the long member 1b for receiving as shown in FIG. 4, the construction state similar to that in FIG. 2 is reached. That is, the work cycle according to the present invention is completed. Then, similarly to the above, a new next receiving long member 1c is driven and the above operation is repeated, so that the tunnel excavation work is sequentially advanced. In addition, when the hole wall 8 tends to collapse due to the geology of the natural ground 7, the injection of the filler from the mouth portion may be omitted. Further, as described above, by omitting the injecting of the filling material from the tip portion of the above BEARING elongated member 1 and the mouth portion, to adopt a technique of injecting a filler material through a dedicated et Note needful tubular member It is also possible.
[0012]
【The invention's effect】
According to the long tip receiving method of the tunnel according to the present invention, while maintaining the advantage that the ground can be effectively strengthened over a wide range of the long tip receiving method using the long member for receiving, the tip thereof Since a method of injecting a filler by injecting a short injection tubular member around a portion that needs reinforcement around the receiving long member is necessary over the entire length of the receiving long member. Since the curable filler can be accurately injected into the portion and the periphery of the tunnel cross section is reliably reinforced, the construction safety is greatly improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view exemplifying a placing state of a long member for receiving used in a long receiving method for a tunnel according to the present invention.
FIG. 2 is a construction explanatory diagram illustrating an outline of a work cycle when the long member for receiving is used.
FIG. 3 is a construction explanatory diagram illustrating the outline of the work cycle.
FIG. 4 is a construction explanatory diagram illustrating the outline of the work cycle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Long member for receiving, 2 ... Connecting member, 3 ... Self-drilling bit, 4 ... Injection pipe support member, 5 ... Injection pipe, 6 ... Passage, 7 ... Ground, 8 ... Hole wall, 9 ... Mouth Injection pipe, 10 ... face part, 11-13 ... filler, 14 ... face part, 15 ... injection tubular member, 16 ... filler, 17 ... support, 18 ... injection tubular member, 19 ... filler, 20 ... face face

Claims (3)

Prior to tunnel excavation work, a long receiving member having a self-drilling bit at the tip is sequentially placed around the tunnel cross section at appropriate intervals, and the peripheral portion of the tunnel cross section is reinforced by the long receiving member. with, successively pouring the infusion tubular member of short to reach near the periphery of the destination BEARING long member of the punching設済, curability around the destination BEARING elongate member through the infusion necessity tubular member A tunnel long tip receiving method characterized by carrying out excavation work while injecting and reinforcing the filler.   The curable filler is injected from a tip portion through an inner hollow portion of the long member for receiving when the long member for receiving is placed around a tunnel cross section. Tunnel long-end receiving method.   When placing the front receiving elongate member around the tunnel cross section, a mouth injection tube is installed around the mouth portion of the front receiving elongate member, and curable from the mouth portion through the mouth injection tube. The tunnel long tip receiving method according to claim 1 or 2, wherein a filler is injected.

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