JPS621354Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an effective lining ring that can be used to accurately and easily maintain the position of the propulsive reaction force of the shield machine or the lining ring during tunnel excavation work using the shield method. This invention relates to a segment-mounted local charging/reaction force holding device.

As is known, shield machines are used to excavate tunnels underground for laying sewerage, water supply, telegraph, electric power, etc. cables, or for constructing underground railroads. In order to excavate by drawing a shield, it is of course necessary to change the direction of the shield machine underground, which has the required length, so the side part of the shield machine must be excavated to make it possible to change the direction of the shield machine. Displacement of the tail of the aircraft is being carried out. However, excavating the required side part of the shield machine at this direction change location (excess digging) naturally creates an excessive space around the shield machine, which affects the stability of the shield machine when it is propelled. Also, since the reaction force during turning acts on the already assembled lining ring, it is difficult to avoid the meandering and pitting phenomenon when the shield machine is propelled, and of course the work efficiency is also lower than when moving straight. There are many problems, such as a decline in performance. However, in the current situation, it is difficult to solve these problems and make the vehicle turn in a normal working condition, and the current situation is that we are struggling to find countermeasures.

In addition, if the excavation geology is a soft rock area or a gravel layer, the cross section excavated by the shield machine will be larger than the outer diameter of the shield machine, so the tail void will naturally be large, so the machine tail If the backfilling material was injected immediately after the assembled lining ring was sent out of the machine, the backfilling material would flow toward the shielding machine, which would unavoidably require a significant amount of backfilling. It will be done late. Therefore, there are problems such as the lining ring meandering or pitting with respect to the axis of the excavated tunnel, or a combination of these, making it difficult to bury the lining ring correctly. .

The present invention solves such problems and eliminates the need for backfilling between the tail void formed as the shield machine excavates, the lining ring assembled in conjunction with the machine tail, and the ground before backfilling is injected. An object of the present invention is to propose a reaction force retaining device by local filling, which allows a lining ring to be easily held in a predetermined position by operation from inside the segment of the lining ring.

The present invention consists of an exterior tube whose proximal end can be removably screwed onto an injection port provided at an appropriate location on a segment that constitutes a lining ring, and a mounting ring fixed inside the rear end of the exterior tube. Therefore, there is an expansion bag storage space consisting of an injection tube and a guide tube whose base is supported and fixed, and a filling material is press-fitted by being placed inside the space and having its open end fixed to the attachment portion of the injection tube or guide tube. an inflatable bag having a volume that sufficiently protrudes outward from the interior portion and expands when inflated; and a shield capable of connecting a filler injection nozzle to the proximal end of the injection pipe via a valve. This is a local filling reaction force retaining device for the lining ring segment in the construction method.

The reaction force retaining device of the present invention is used by attaching one or more to each segment of the lining ring (hereinafter simply referred to as a segment), and the injection pipe is filled with a coagulating material that can provide early strength. By injecting, the internal expansion bag is inflated to protrude to the back side of the segment, and the expanded bag forms a lump locally between the ground and the segment, and the reaction force is generated by this swelling lump. This made it possible for the soil to hold the soil.

The configuration for forming the expansion bag storage space may be a cylindrical space formed by a guide tube whose base is fixed inside the outer tube and the injection tube, or a cylindrical space formed by the injection tube only with the base fixed inside the outer tube. The guide tube is fixed and protrudes concentrically for an appropriate length, and the guide tube is directly connected to and extends from the end of the screwed part of the segment injection port of the outer tube, and a space is formed between the guide tube and the injection tube. You may also do so. The bottom of the bag is housed in the guide cylinder by a protective cap so as not to be exposed from the housing space.

Hereinafter, one embodiment of the device of the present invention will be described in detail with reference to the drawings. In FIG. A screw 1' is cut into the hole and has an appropriate length. Reference numeral 2 denotes a space forming body for accommodating bags, which has a longer dimension than the exterior tube 1, and its base end is fixedly supported by a mounting ring 3 fitted inside the exterior tube 1. It consists of an injection tube 4 and an outer guide tube 5, and a cylindrical bag storage space 6 is formed at an appropriate interval between the injection tube 4 and the guide tube 5. The distal end is slightly longer than the injection tube 4. In addition, this guide tube 5
The injection tube 4 and the injection tube 4 are made of synthetic resin, and cut grooves 5' and 6' for cutting are cut on the outer peripheral surfaces of both in the vicinity of the tip of the outer tube 1, respectively. Reference numeral 7 denotes an inflatable bag, whose open end 7' is engaged with the base end of the guide tube 5 by folding it back an appropriate amount from the inside to the outside;
In this state, the base end of the guide cylinder 5 is fitted and fixed to the mounting ring 3, and the length from the opening end to the bottom is sufficiently longer than the entire length of the space forming body 2 ( For example, the length of the space forming body is approximately twice the length of the space forming body), which is sufficiently larger than the diameter of the bag storage space 6, and the material is sewn from cloth with high tensile strength. . In addition,
The shape of the inflatable bag 7 in the expanded state can be any arbitrary shape such as a cylindrical shape, a conical shape, or a spherical shape. Reference numeral 8 denotes a protective cap for the expansion bag, which prevents the expansion bag 7 housed in the space 6 between the guide tube 5 and the injection tube 4 from popping out when not in use or from being damaged by foreign matter entering from the outside. so that the guide cylinder 5
The guide tube is crimped and locked against the cap or the cap. Reference numeral 9 denotes a filler injection pipe connecting portion to the injection pipe 4, and a thread is provided so that a nipple can be screwed into the connection part.

When using the device of the present invention configured as described above, as shown in FIG. ' parts are screwed together to attach the bag storage space forming body 2 so that the tip end thereof is located inside the mounting opening 11. In this way, the outer tube 1 serves to hold the device attached to the segment 10. A socket 14 equipped with a joint pipe 15 is attached to the proximal connection part 9 of the attachment ring 3 to the injection pipe 4 via a nipple 13, and a nozzle for pressure-feeding the injection material is attached to the tip of the joint pipe 15. During installation, a backfilling material such as cement mortar, which provides early strength, is press-fitted as a filler.

Then, the backfilling material is press-fitted into the interior through the injection pipe 4, first filling the injection port (generally 2).
~3Kg/ ^cm2 ), the protective cap 8 is released from its lock and scattered into the space C on the back of the segment 10, and at the same time, the expansion bag 7 is injected with the injection force of the backfill material D injected into its interior. As a result, the bottom protrudes from the space 6 into the space C between the ground A and the back surface of the segment 10, and bulges out until it comes into contact with the ground A.
At this time, the expansion bag 7 is guided by the inner surface of the guide tube 5 on the outside and the outer surface of the injection tube 4 on the inside, and smoothly expands to the outside of the back surface of the segment 10 by the amount of backfilling material filled, causing no obstruction. When the bag 7 comes into contact with the ground and the amount of backfilling material D is almost filled, the injection is stopped and the backfilling material D solidifies, and this expansion bag 7 Together with the filling material D, it solidifies into a local lump-like shape between the back surface of the segment and the ground A, forming a so-called bulging tension. When filling with this injected backfilling material, residual gas and moisture inside the inflatable bag are released from its weave to the outside, and the backfilling material is quickly filled and the bag expands accordingly. The desired operation can be completed in a short time.

Therefore, when the device of the present invention is used to maintain the propulsion reaction force during curved movement of the shield machine in the shield construction method, one or more mounting holes are provided in the circumferential direction per segment as shown in Fig. 3. By attaching a reaction force holding device to each attachment port 11 of this segment 10, and operating these reaction force holding devices all at once or sequentially as described above, the back surface of the segment 10 and the ground A plurality of expansion bags 7 are filled with backfill injection material between the ground mass A and the segment 10, and the solidified lump B is formed according to the state of the opposing position of the ground mass A and the segment 10, even though the distance between them is uneven. This means that the reaction force can be maintained stably by pushing against the shield ring, and the propulsion reaction force when the shield machine moves in a curve can be directly borne by the lining ring. It was now possible to excavate in stable conditions. After the injection backfilling material filled in the expansion bag 7 has condensed, when removing the outer tube 1 from the threaded portion of the segment 10 with respect to the mounting port 11, the outer tube 1 is rotated in the opposite direction to the threaded portion of the segment 10. At this point, the injection tube 4, the expansion bag 7, and the distal end of the guide tube 5 have already been integrated up to the segment attachment port 11 by solidification of the injection material, so the fixed attachment ring 3 is fixed inside the outer tube 1. When rotating together, the injection tube 4
and the guide tube 5 is cut at the grooves 5' and 6',
The exterior tube 1 and the bag accommodation space forming body 2 directly connected thereto are removed from the segment, and the remaining portion of the bag connected to the proximal opening is the inlet end of the segment opened by removing the exterior tube 1. By cutting with a knife or the like, the part protruding inside the segment of the device can be completely removed and will not interfere with subsequent work.

The above explanation is for the case where the shield machine moves in a curved direction, but the reaction force holding device of the present invention is used for pre-treatment of backfilling of the lining ring after excavation at the excavation work site using the shield method in stable strata such as soft rock strata. As mentioned above, it can be used as a lining ring. In this case, for example, one injection port may be provided per segment, and each segment of one lining ring may be provided with a reaction force holding device. By installing and activating each device in sequence according to the required procedure, or by activating each device all at once, each device forms a corresponding bulge between the back of the segment and the ground. Therefore, the lining ring is maintained aligned with the axis of the excavation hole, and is held in the ground around the entire circumference without meandering or pitting due to the thrust reaction force of the shield machine, thereby preventing interference with the shield machine. This means that backfilling work can be carried out smoothly to the extent that it does not occur.

In short, the device of the present invention is capable of easily forming a local retainer between the segment of the lining ring and the excavated ground from within the ring to maintain the segment in a stable state. The device is not limited to the above-mentioned embodiment, but also includes an exterior tube 1A as shown in FIG.
The end portion of the bag housing space body 2 is made longer than the fixing position of the attachment ring 3, and a check valve 17 having a hinge-shaped valve is installed inside the bag storage space body 2 to prevent backflow. In this case, a thread 16 for connecting an injection nozzle is provided at the rear of the outer pipe 1A where the check valve 17 is attached.

In addition, the bag storage space body is not limited to the above embodiment, but for example, as shown in FIG. The opening end of the inflation bag 7 is fitted and fixed in the annular groove 18, for example, through a locking ring 19 such as a spring ring. The bottom of the bag 7 can be protected by fixing the cap 8 by caulking or the like. Note that the injection pipe 4 may be long as in the embodiment described above (as shown by the two-dot chain line), or may be extended halfway. The attachment ring 3 may be the same as in the previous embodiment, or it may be an extension of the outer pipe, such as a check valve built-in type as shown in FIG.

As mentioned above, the device of the present invention is attached to the injection hole provided in the segment of the lining ring and press-fits the injection backfilling material, thereby causing the inner bag to protrude and expand outside the segment, thereby connecting the segment and the ground. In the space between the peaks, the injected backfill material is locally solidified by the restriction of the expansion bag to form a bump that acts as a tension, and the propulsive reaction force for the shield machine's curved movement is applied to the segment. Even if all of the force is held as when going straight, the component force will be transmitted to the ground through this bump part, and smooth excavation will be possible without any problems.Also, even when going straight, the tail void diameter of the shield machine will When excavating in stable strata that become excessively large, the axial center position of the lining ring can be easily maintained with respect to the ground by forming bumps, thereby preventing meandering and pitting and improving work efficiency. It has many practical advantages, such as its simple structure, easy handling during use, easy manufacture, and low cost. be.

In addition, according to the gist of the present invention, the technical idea is not limited to the above-mentioned embodiments, and any modifications, applications, or diversions derived therefrom are encompassed within the technical scope of the present invention. Needless to say.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially omitted vertical cross-sectional view of the whole, FIG. 2 and FIG.
The figure shows an example of the operating mode, and FIGS. 4 and 5 are longitudinal cross-sectional views of other embodiments of the device. 1, 1A...Exterior tube, 2...Double pipe, 3...Mounting ring body, 4...Injection tube, 6,5A...Guide cylinder, 6...Bag storage space, 7...Inflatable bag, 7 ′...
Opening end, 8...protective cap, 9...connection part,
10... Segment, 11... Mounting port, 14...
Kotoku, 15...Joint pipe, 17...Check valve, A...
...ground, B...bump, C...space, D...backfill material.

Claims (1)

[Scope of utility model registration request] The base is supported and fixed by an exterior tube whose base end can be removably screwed into the injection port provided at the appropriate location of the segment of the lining ring, and a mounting ring fixed inside the rear end of the exterior tube. An inflatable bag storage space consisting of an injection tube and a guide cylinder, which is placed inside the space and whose open end is fixed to the attachment part of the injection tube or guide cylinder, so that when the filling material is inflated by press-fitting, the inner part A cover in a shield construction method, comprising an expansion bag having a volume that sufficiently protrudes to the outside and expands, and configured such that a filler injection nozzle can be connected to the proximal end side of the injection pipe via a valve. Local charging/reaction force retaining device for mechanical ring segments.