JP3507606B2 - Construction method of sewer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a sewer such as a waterway. 2. Description of the Related Art As a method of forming a conduit such as a water channel, a resin pipe such as a fiber-reinforced resin pipe is fitted inside a segment, and a grout material such as mortar is inserted into a gap between the resin pipe and the segment. Has been known, and a resin pipe is concentrically arranged to form a sewer (for example, Japanese Patent Publication No. 6-13919). Incidentally, resin pipes are easily deformed by external pressure as compared with concrete pipes. Therefore, in order to prevent the resin pipes from being deformed, sufficient care must be taken not to increase the injection pressure of the grout material injected into the gap between the segments and the segments. Need to be injected. Conventionally, as a method of injecting the grout material, a method has been employed in which an injection tube is guided to a gap between a resin tube and a segment through a front partition wall divided into a predetermined length, and the grout material is discharged from the tip. [0004] In the above method, the pressure gauge cannot be attached to the discharge port of the injection pipe due to the presence of the partition wall. The pressure is being measured. Therefore, the pressure loss of the grout material occurs during the transfer from the position of the pressure gauge to the outlet of the injection pipe, and the measured value includes the pressure loss, and the measured value of the insertion pipe of the resin pipe or the like is included. There was a problem that the true external pressure acting on the tube wall was not measured, and thus the injection pressure could not be accurately controlled. The present invention solves the above-mentioned drawbacks of the prior art, and measures the pressure of the grout material to be injected accurately so as not to apply a large external pressure. An object of the present invention is to provide a method of constructing a sewer in which an intubation is not deformed or damaged. [0006] A method of constructing a sewer according to the present invention is a method of constructing a sewer by filling a grout material in a space between an intubation tube arranged in a segment and the segment. In, the gap between the intubation and the segment is divided into a predetermined length, a plurality of inlets are provided at intervals in the intubation located in the area of the separated gap, the innermost portion of the inlet Connect the injection pipe introduced into the intubation to the injection port, inject the grout into the gap while measuring the pressure of the grout with a pressure gauge attached to the tip of the injection pipe, and set the pressure of the grout to a specified value. When the pressure reaches the pressure, the grout material injection is stopped, the injection pipe is replaced with the immediately preceding non-injection side injection port, and the grout material is injected into the gap while measuring the pressure of the grout material in the same manner as described above. Thereafter, if necessary, one by one The grout material is injected from a non-injection injection port immediately before. In the present invention, the back portion and the near side refer to the insertion port side of the injection tube as the front and the tip direction of the injection tube as the back.
Examples of the intubation tube used in the present invention include a fiber-reinforced resin tube, a resin concrete fiber-reinforced resin tube, and the like. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which (a) is a cross-sectional view showing a state at the start of grout material injection, and (b) is a cross-sectional view showing a second grout material injection state. FIG. FIG. 2 is an enlarged cross-sectional view of a grout injection portion. 1 and 2, 1 is a segment, 2 is an insertion tube made of a resin tube such as a resin concrete fiber reinforced resin tube, 3 is an injection tube, and 4 is a partition. The segment 1 is covered by, for example, a shield method, and the inner tube 2 is inserted into the segment 1. Since the intubation tube 2 is a fixed length object, it is inserted into the segment 1 from the left side in the drawing, and is used by being sequentially connected by a conventional method. The inner cannula 2 preferably has a caliber that can be inserted by a person, and usually has a caliber of 800 mm or more. Reference numeral 4 denotes a partition wall which divides a gap between the intubation tube 2 and the segment 1 into a predetermined length.
At intervals of 1 and 1 span. In this embodiment, the insertion port side of the intubation tube 2 and the injection tube 3 is set to the front side, and the distal end direction of the injection tube is set to the back side. A mouth is provided, and the right side is referred to as a back direction. The partition wall 4 shown on the left side of the drawing is referred to as a front partition wall. Reference numeral 5 denotes an injection port for injecting a grout material into the gap between the intubation tube 2 and the segment 1, and is attached to a hole formed in the upper portion of the intubation tube 2 located in the divided gap portion. You. The injection port 5 is provided at two places, that is, at the inner part and at the center of the divided space. A ball valve 6 is connected to the inlet 5, a coupling joint 7 fixed to the tip of the injection pipe 3 is connected to the ball valve 6, and the injection pipe 3 is detachable from the ball valve 6. The coupling joint 7 is provided with a pressure gauge 8. The result of the pressure measurement by the pressure gauge 8 is sent to a grout material injection plant (not shown) via a lead wire 9. Reference numeral 10 denotes an air vent, and an air vent tube 11 is provided upright at the air vent 10. The tip of the air release pipe 11 is close to the wall surface of the segment 1. Next, the procedure for constructing a sewer according to the present invention will be described. A fixed-size intubation tube 2 is sequentially fed from left to right in the drawing into a segment 1 lining by a shield method or the like, connected to each other, and arranged concentrically in the segment 1. The gap between the intubation tube 2 and the segment 1 is separated by partition walls 4,4. In this case, the inlet 5 and the air vent 10
Are prepared in advance, and the injection port 5 is prepared.
The intubation 2 provided with is located at the back and center of the area, and the intubation 2 provided with the air vent 10 is connected so as to be located near the front partition 4. Note that a ball valve 6 may be attached to the inlet 5 and the air vent 10. Then, the injection tube 3 is inserted into the provided intubation tube 2 from left to right in the figure. The coupling joint 7 is inserted into the distal end of the injection pipe 3 as described above, and the injection pipe 3 is connected to the ball valve 6 attached to the injection port 5 at the back by the coupling joint 7. Next, a grouting material injection plant (not shown) is operated, and grouting material G such as mortar is injected from the tip of the injection pipe 3 through the injection port 5 into the partitioned gap. At this time, the ball valve 6 attached to the inlet 5 at the back and the ball valve 6 attached to the air vent 10 are kept open. Further, the pressure of the grout material G is measured by a pressure gauge 8 attached to the tip of the injection pipe 3. As described above, the pressure gauge is provided at the tip of the injection pipe 3, and since the pressure gauge is not separated from the discharge port of the injection pipe as in the related art, the pressure loss is measured while the grout material is transferred through the injection pipe. It is possible to know the true external pressure acting on the tube wall of the intubation without performing. This measured value is sent to the control unit of the grout injection plant by the lead wire 9,
The grouting plant has been shut down. If the grout material G is not completely filled into the gap even if the operation of the grout material injection plant is stopped (if the grout material G starts dropping from the air vent 10, the filling is complete). From the inlet 5 at the back. The ball valve is removed from the injection port 5 and a hole in the tube wall of the intubation tube 2 is closed with a stopper 12. The injection pipe 3 is connected to the injection port 5 at the center, the ball valve 6 is opened, the grout injection plant is operated, and the grout G is injected in the same manner as described above. When the grout material G begins to fall from the air vent 10, the filling is stopped because the filling is sufficient, and the injection pipe 3 is removed from the central injection port 5. And
The injection port 5 and the air vent 10 are removed together with the ball valve, and the holes are plugged and closed. In addition, air vent tube 1
1 may be buried. Thus, the grouting material is injected into the voids in this area. Subsequently, grout material is injected into the gap between the intubation tube 2 and the segment 1 in the left direction in the figure in the same manner as described above, and this process is sequentially repeated. Finally, the injection tube 3 is removed. Thus, a sewer is built. In the illustrated embodiment, two inlets are provided at the back and center of one span. However, three or more inlets can be provided as needed. According to the method for constructing a sewer according to the present invention, the external pressure acting on the pipe wall of the intubation can be accurately known, and when the external pressure becomes unnecessarily high, the grout material is injected. Since the injection is performed from the near side, deformation and destruction of the intubation can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the present invention;
(A) is a cross-sectional view showing a state at the start of grout material injection,
(B) is a sectional view showing a second grouting state of the grout material. FIG. 2 is an enlarged cross-sectional view of a grout material injection portion. [Explanation of Signs] 1 segment 2 intubation tube 3 injection tube 4 partition wall 5 inlet

Claims (1)

(57) [Claims 1] In a method for constructing a sewer by filling a grout material in a gap between the segment and the intubation tube arranged in the segment, the method comprises the steps of: The cavity is divided into predetermined lengths, and a plurality of injection ports are provided at intervals in the intubation located in the area of the divided voids, and introduced into the insertion tube at the innermost injection port of the injection port. The grout material is injected into the gap while measuring the pressure of the grout material with a pressure gauge attached to the tip of the grout material, and when the pressure of the grout material reaches a predetermined pressure, the grout material is connected. Stop the injection, replace the injection tube with the injection port on the side before the non-injection, and inject the grout material into the void while measuring the pressure of the grout material as described above, and thereafter, if necessary, as described above From the injection port on the non-injection side immediately before Construction method Kanmizo characterized by injecting the wood.