JPS6030838B2 - Direction correction method for propelled underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a propulsion method to accurately horizontally and vertically construct structures (about 300 m/m to 1,000 m/m) on small-edge land leveling, where normal workers cannot excavate the face. Furthermore, the present invention relates to a method that allows for remote direction correction.

The gist of this is that a direction correction excavation body 4 with a closed excavation structure is placed stationary underground, the attitude of the excavation body 4 is displayed on the shaft 1 side by a level detector 21, and a remote control system is used. Water (or air) is injected from a plurality of holes provided on each wall surface of the excavation body 4, and the ground is selectively pressed using pressure plates 10 and 12 similarly provided on each wall surface to take up a reaction force or fill a gap. The present invention provides a method for correcting the direction of a propulsion type underground structure in which horizontal and vertical adjustments are forcibly made.

Conventionally, when burying this kind of small-diameter underground structure by propulsion method, the method and device for correcting the direction were to install a small hydraulic pressure in the circumferential gap between the blade shoe (or excavation body) and the leading pipe. A jack is mounted in a bag, and the jack is operated as the propulsion tube row moves forward to change the crowning angle of the blade shoe with respect to the leading tube, thereby changing the axis of the blade shoe and the tube to the designed central axis. is being done a lot.

However, in the case of this method, the direction is corrected as the tube row progresses, so even if the tube axis returns to the designed central axis, the modified portion of the tube row as a whole will leave a meandering part in the tube row. be. Therefore, in the case of sewage pipes, etc., problems such as a decrease in flow velocity are caused, and the underground structure is not suitable. On the other hand, as the tube row advances, the direction is corrected by changing the direction of the blade shoe, so in many cases, when a change in course is discovered, the angle at which the blade shoe is crowned is changed empirically. In addition, when the blade shoe returns to the designed center axis, it is corrected based on the crowning angle of the blade shoe, but since the rear tube row is already meandering, the blade shoe tends to flow along this meandering line (especially (for soft ground). Therefore, it very often returns too far from the design center axis. For this reason, it becomes necessary to correct and change the crowning angle of the blade shoe in the opposite direction again, resulting in an inconvenience that the degree of meandering and the number of meandering locations increase. Furthermore, when used as a sheath tube, it is often impossible to use it.

Therefore, when a change in direction of the excavating body (cutter) or tube axis is discovered, it is desirable to correct the blade shaft at the displaced position without advancing the tube row but in a stationary state.

The present invention was developed in view of such prior art, and is an epoch-making invention that allows for safe and reliable direction correction in the horizontal and vertical directions.One embodiment of the present invention will be described below. Figure 1, Figure 2, Figure 3, Figure 4, Figure 5
6 and 6 and will be described in detail.

Although the method of the present invention can be used regardless of whether the structure is box-shaped or circular, for clarity of explanation, a box-shaped structure will be used for explanation.

Figure 1 is a general longitudinal cross-sectional view, and it is assumed that a row of boxes is being propelled and buried at the design center axis L, using the propulsion method, and the axis L2 of the leading excavation body 4 is deflected downward by an angle of 8 degrees. It means that there is.

In this state, the hydraulic jack 3 installed in the shaft 1 is pressed against the bonito 2.
When the jack 3 is actuated to take a reaction force and push the row of boxes, the thrust of the jack 3 is transmitted only through the contact point 6 between the pipe 5 and the excavation body 4, and the row of boxes moves downward more and more, so when this change in direction is discovered. The progression of the box array is stopped at , and only the excavated body 4 is corrected to the axis L. That is, the pressure plate 12 on the opposite side for direction correction is projected from the wall surface of the excavation body 4 and pressed against the ground, imparting a reaction force to the excavation body 4, and forcing the excavation body 4.
Correct the displacement of axis ○. At this time, as a method of promoting correction, a plurality of holes 24 provided in the wall surface of the excavated body 4 on the side to be corrected are used.
...A gap is formed between the ground and the wall by injecting pressurized water or compressed air. On the other hand, a level detector 21 is installed inside the excavation body 4, and the horizontal and vertical states of the excavation body 4 are displayed remotely on the shaft 1 side. The axis of the excavation body 4 is changed by remotely controlling the jack. Although the area of the pressing plates 10 and 12 relative to each wall surface of the excavation body 4 is relatively small, for example, the area of the pressing plates 10 and 12 is 5 to 10 cm.
Even if the excavated body 4 digs into the ground to a certain extent, the axis of the excavated body 4
If 3c is corrected, the intended purpose will be achieved. In practice, corrections are made in terms of the number/skin of the vehicle's center of gravity displacement.

Note that when the method of the present invention is adopted, the detector 21
For lowering, it is desirable to adopt a method that does not allow soil or water to flow into the hollow chamber 19 in which the hydraulic jacks 13 and 14 are installed. A good effect can be obtained by closing the pipe, disposing a hose or steel pipe 7, and discharging it to the shaft 1 side by vacuum or air pressure.

In the case of using a steel pipe or the like 7, a hinge structure 30 may be provided to connect the slope portion 29 of the excavation body 4 at the terminal entrance. .

First, the excavation body 4 includes pressing plates 10 and 12 (only the upper and lower wall surfaces are shown).

), holes 24..., 26... and level detector 21
is provided, and the digging body 4 is constructed to be the same as the following box 5 or to be relatively short. Further, the connecting portion between the excavating body 4 and the leading box 5 has a structure that can prevent water or earth from flowing in and can be bent. In addition, 22 in the figure
indicates the cable connecting from the shaft 1 side. Regarding the pressing plates 10 and 12, opening windows 9 and 11 are provided on the upper and lower walls of the excavation body 4, and the pressing plates 10 and 12 have an area smaller than that of the windows 9 and 11, respectively. 12, a reaction force support body is provided inside the excavation body 4, and small hydraulic jacks 13 and 14 are interposed.

As a result, the pressure bushes 10 and 12 are projected toward the ground by the operation of the jacks 13 and 14, respectively.

Now, for example, if one of the pressing discs 10, 12 is protruded and pressure water is selectively applied to the ground, the ground will be partially disturbed, and the center of the excavation body 4, L, will be shifted from the axis -, L. obtain.
Furthermore, the pressure bushing plates 10 and 12 can be installed in vertical positions with the same center axis as shown in FIG. It may also be provided. In one example of the former method of vertically coaxially mounting, a hollow support cylinder 15 is constructed so as not to affect the piping 7, and hydraulic jacks 13 and 14 for the bale pressing machines IQ and 12 are fixed below it. At the same time, support arms 16, 16 are firmly installed on the left and right sides of the support cylinder 15 with bolts 17, 17 through the wall of the excavation body 4, and the tip of the piping 7 has a closed end on the slope portion 29. 7-1 is positioned to suck in earth and sand from the face ground 18 and discharge it to the shaft 1 side.

Also, like the latter, the upper and lower compression plates 10-1 and 12-1
One example of a method for installing the jacks 28-1 and 28-2 at different levels in the front and back is to install the stands 28-1 and 28-2 that support the jack reaction force inside the excavation body 4 so as not to affect the installation of the piping etc. 7. It is also possible to use a method in which the pressure acid discs I0-1 and 12-1 are firmly attached via jacks 13-1 and 14-1. Further, a small-diameter pipe 8 is inserted into the hollow 27-2 of the piping 7, and the end 8-1 of the pipe 8 is protruded into the cone-shaped hollow formed by the slope portion 29. Become. This pipe 8 is used to force-feed pressurized water (or air), and the piping 7 is used to force-feed and discharge earth and sand to the shaft 1 side. In the figure, 27-1 is the hollow part of the pipe 8. In addition, the outer surface of the compression plate is provided so as to be the same as the outer wall surface of the excavation body 4 or to form a concave surface of several meters/skin. On the other hand, the excavation body 4 can be made of steel, reinforced concrete, or composite (the outside of the steel pipe or PVC pipe 20 is made of concrete), depending on the diameter of the box, soil conditions at the site, etc.

As described above, the pressure plate device is installed inside the excavation body 4,
Furthermore, as shown in FIG. 6, a plurality of holes 24..., 26... are provided in the wall surface of the excavation body 4 where the pressing plates 10, 12 are located, and the holes 24..., 26... - Pressure water or compressed air is injected toward the ground side to form a gap and change the direction of the excavation body 4.

Piping for the holes 24...0, 26... is led to the shaft 1 side through the excavation body 4 and the box array 5.... As described above, one example of the construction procedure is to read the detection display on the side of the shaft 1 using the detector 21 and detect the direction change state of the excavation body 4.

Next, one pressure plate 10 (or 12) is operated to obtain a ground reaction force, and the holes 26...
(or 24...) A method of more selectively ejecting pressurized water (or compressed air) and thereby displacing the axis of the excavation body 4 is being explored. In the pond example of the construction procedure, while the excavation body 4 is changing direction, the upper and lower pressing plates 10 and 12 are operated simultaneously,
Next, the pressing plate 10 (or 12) on the side to be changed is retracted, and at the same time, the pressing plate 10 (or 12) on the opposite side is further retracted.
2) A method is adopted in which the robot is extended and the direction is easily changed.

At this time, pressurized water (or compressed air) is ejected in the same manner as above. In this manner, while observing the detection display on the side of the shaft 1, the excavation body 4 can be remotely controlled to freely move up and down to change its direction. When this operation is completed and the excavation body 4 is adjusted to the specified axis, excavation of the face, evacuation, and propulsion of the box array are performed in the usual manner.

According to the present invention as described above, the following useful effects can be achieved.

1. Conventionally, the course was corrected as the row of boxes progressed, which resulted in the so-called axis returning too much (too much correction) and the entire row of boxes becoming meandering after completion, but the present invention Now, we set the box array to a stationary state and corrected the excavation body by the specified axis 0' at the position where the direction changed.In other words, we made a complete correction immediately in the ground where the direction changed, so after finishing In this case, the entire box array can be placed on a perfectly defined axis.

2. Since the excavation body is corrected at the point (position) when it changes direction, the following box can easily maintain the prescribed straight (or curved) movement.

That is, since there is no meandering or changing direction, the connections in the box array are safe and secure, and there is no leakage or damage. Conventionally, the course was corrected as the row of boxes progressed, and the multiple connections often created gaps that allowed water or mud to flow into the boxes or damage the end faces. However, according to the present invention, the connection can be expected to be perfectly designed and safe.

3. Since it is remotely controlled, even if it is a small-mouthed structure, it can be freely controlled in straight and curved directions.

4. In addition to being very effective, the device can be easily manufactured, so it can be used for construction projects with low construction costs, and the cost is low.

5 In the case of long-extension construction work that includes straight sections or curved sections (in the vertical and horizontal directions),
According to the present invention, the method of the present invention which can be easily carried out includes:
In addition to what has been described in the first embodiment, it is possible to design and construct, for example, a small-mouthed flea structure within the spirit of the patent law.

[Brief explanation of the drawing]

Figure 1 is a general longitudinal explanatory diagram. FIG. 2 is a longitudinal cross-sectional view of an excavation body 4 showing one embodiment of the present invention. FIG. 3 is an explanatory cross-sectional view of one embodiment as viewed from the arrow 1-1 in FIG. 4 and 5 are cross-sectional explanatory views of other embodiments taken along arrows 1-1 in FIG. FIG. 6 is an explanatory plan view as viewed from the row 0 arrow in FIG. In addition, in the figure, 2 is the bearing wall, 3 is the hydraulic jack for propulsion, 4 is the excavation body, 7 is the piping, 7-1 is the Sekiguchi end, 8
11 is the end, 9 and 11 are closed windows, 10, 12, 10-1
, 12-1 is a pressure welding board, 13, 14, 13-1, 14-1
is a hydraulic jack, 15 is a support cylinder, 16 is a support arm,
17 is nut, 18 is face ground, 19 is hollow, 20-1
, 20-2 is a steel pipe or PVC pipe, 21 is a bell detector, 22 is a cable, 23, 25 are piping, 24, 26 are holes, 27-1, 27-2 are hollow, 28-1, 28-2 29 represents a pedestal, 29 represents a sloped portion, and 30 represents a hinge connection portion. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A direction correction excavation body (■) having a closed excavation structure is kept stationary underground, the attitude of the excavation body (■) is displayed on the shaft 1 side by the level detector 21, and the position of the excavation body (4) is controlled by remote control. Water (or air) is injected from multiple holes provided on each wall, and pressure plates 10 and 12 provided on each wall are used to selectively press the ground to create a reaction force or create a gap. A method for correcting the direction of a propulsion type underground structure, which is characterized by horizontally and vertically adjusting the structure.