JP4136762B2 - Method for transporting long hollow pipe into side tunnel and method for laying piping in side tunnel using the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for laying a pipeline for protecting gas or liquid in a horizontal pit tunnel continuous to the lower part of a shaft, a protective tube for electric cable, etc. (hereinafter referred to as “hollow tube”). In particular, when the shaft is deep and the horizontal tunnel is long, the method of safely transporting the long hollow tube into the horizontal tunnel and the efficiency and low cost of using the transport method are low. The present invention relates to a tunnel laying method.
[0002]
[Prior art]
Conventionally, when a hollow pipe is laid in a horizontal tunnel that extends in a substantially horizontal direction from the bottom (near the bottom) of a substantially vertical shaft, such as a common groove, a hollow tube shorter than the diameter of the shaft Is generally lowered to the bottom of the shaft and then each hollow tube is transported to a predetermined position in the side tunnel and sequentially welded. However, in the method in which a new hollow pipe is always transported to the forefront of the completed pipe laid in this way, and it is sequentially welded and extended, the welding work site must also move sequentially to the back of the side tunnel. Therefore, when the horizontal tunnel becomes long, there is a problem that the efficiency of pipe laying work is lowered.
[0003]
Therefore, in Japanese Patent No. 2754281 (Patent Document 1), a long pipe manufacturing space is provided in a part of a horizontal tunnel that extends from the starting shaft, and a centering temporary assembly device or welding installed in the long pipe manufacturing space is provided. By using the equipment, inspection equipment, and smoke exhausting equipment, a plurality of hollow pipes lowered from the starting shaft are welded together to form a long hollow pipe (unfinished pipe), and then the horizontal pipe is transported by the transport device. An in-tunnel piping method has been proposed in which the inside of a tunnel is moved and connected to a long pipe (completed pipe) that has been previously piped.
[0004]
[Patent Document 1]
Japanese Patent No. 2754281 (page 1-2, Fig. 1-2)
[0005]
[Problems to be solved by the invention]
According to the tunnel piping method, the base end portion of the horizontal tunnel connected to the starting shaft is used as a work space for manufacturing a long tube, and the hollow tubes lowered from the starting shaft are sequentially elongated. Since piping is laid, it is possible to efficiently eliminate welding fumes by concentrating on the long pipe manufacturing space, and there is an advantage that welding piping work can be performed efficiently without deteriorating the work environment. The hollow tube carried in from the shaft is the same as the conventional shaft with the maximum diameter (horizontal section maximum length) or less, and since it was carried down in a horizontal state, it was inevitably welded. The number of work could not be reduced.
[0006]
In order to reduce the number of welding operations, it is sufficient to use the longest hollow tube possible. However, increasing the maximum diameter of the shaft is rather expensive. If a long hollow tube is lowered and carried in a vertical state so as to drop into the shaft, the hollow tube is placed in the horizontal state at the bottom of the shaft and is again fed into the horizontal tunnel. A slinging work is required and is complicated.
[0007]
Further, in the tunnel piping method, the welded and connected hollow pipe (completed pipe) pushes the rear end portion located on the starting shaft side with a battery-driven transfer device or the front end portion located on the reaching shaft side However, work space tends to be short because new hollow tubes are sequentially lowered and carried on the rear end side, and when the front end side is pulled, There is a drawback in that it is difficult to cooperate with other operations such as a hollow tube carrying-in operation and a welding connection operation, and as a result, the safety of the operation is impaired.
[0008]
In view of the difficulty of such conventional hollow tube carrying-in work and piping laying work, the present invention is a long hollow tube horizontal tunnel with improved safety while further reducing the work man-hours and increasing efficiency. It is an object to provide an inward carrying method and a pipe laying method in a horizontal tunnel.
[0009]
[Means for Solving the Problems]
In order to solve the desired problem, in the method for carrying in the long hollow tube according to the present invention in the horizontal tunnel, a guide wire is stretched in the vertical direction on the side wall surface of the starting shaft opposite to the opening of the horizontal tunnel. On the other hand, a retractable carriage that is movable from near the lower end of the guide wire into the side tunnel is disposed, and an upper pipe hanger and a lower pipe hanger are temporarily fixed to both ends of the long hollow pipe, respectively. With the hanging wire connected to the hanging tool, the long hollow tube is lowered vertically into the starting shaft, and after the upper pipe hanging device is connected to the guide wire, the long hollow tube is further lowered to the lower piping. The long hollow tube was placed horizontally by moving the hoisting tool into the side tunnel while being connected to the pulling carriage. It was lowered along the guide wire while allowing the adoption of a longer hollow tube that is not restricted by the maximum diameter of the starting shaft by hanging and carrying it in a state of standing vertically into the starting shaft. Later, a pull-in cart facilitated the change of direction in the horizontal direction.
[0010]
The lead-in cart is preferably arranged on a temporary track laid from the bottom of the shaft to the inside of the horizontal tunnel, and is configured to be moved manually or electrically on the temporary track. In order to prevent the fall accident by dropping the long hollow tube in a stable state, the upper and lower pipe suspensions are temporarily fixed to both ends of the long hollow tube. The lower wire is connected to the upper pipe hanger and the lower pipe hanger so as to extend along the outer side of the long hollow pipe or to be inserted inside the long hollow pipe. On the other hand, the guide wire and the upper pipe hanger may be connected loosely by a snap hook or the like.
[0011]
In order to efficiently lay down the long hollow pipe that has been carried down near the entrance of the side pit tunnel as described above, the pipe laying method in the side pit tunnel according to the present invention is Guide rollers are temporarily installed on the frames provided at multiple locations at predetermined intervals in the tunnel, and a winch wire is installed from a temporary winch provided near the starting dredging pit with the temporary pipe feed fixed installation installed in the middle of the horizontal tunnel as a turning point. A first step in which a plurality of long hollow tubes carried from the starting shaft are connected by welding and then moved from the welding work site to the ultimate shaft and temporarily placed, and the temporarily placed unfinished pipe Installed on the guide roller at a predetermined position of the frame and contacted with the last end of the finished pipe that has already been welded and connected by welding, and then using the winch wire to move the finished pipe to the final shaft Only the second step of delivered was be performed in parallel.
[0012]
The frame provided in the horizontal tunnel is for distributing a plurality of pipes and holding them in a shelf shape, and is arranged at a plurality of locations at predetermined intervals so that the laid pipes do not bend. By temporarily installing a guide roller at each hollow tube placement position in this frame, a completed pipe that has already been welded and connected, or a new incomplete pipe that is welded and connected to the end of the finished pipe The work of sending in the direction of the reaching shaft becomes easy. It is advisable to temporarily attach a sharp cap such as a conical shape at the most advanced portion of each finished pipe to be sent out so that it can be smoothly placed on the guide roller of the next reaching structure. .
[0013]
The winch wire is a temporary installation that is located near the starting dredging shaft with some space to avoid the inside of the narrow horizontal tunnel, with the temporary pipe delivery fixed stand installed in the middle of the horizontal tunnel as a turning point. The winding operation is performed by the winch. The temporary pipe delivery fixed stand is arranged in order from the entrance of the horizontal tunnel toward the arrival shaft, a welding work place for connecting a plurality of long hollow tubes in advance, and the welded unfinished pipe It is set in the completed pipe part that goes beyond the temporary work place and the connection work place where a new unfinished pipe is welded to the end of the finished pipe, and further enters the inner side of the horizontal tunnel. For example, a winch wire is connected to the front end of the unfinished pipe transferred from the temporary storage site, and the foremost end of the unfinished pipe is brought into contact with the rear end of the finished pipe already arranged at a predetermined position of the frame. Next, welded connection is made by winding up the winch wire stretched up to the temporary winch provided at the bottom of the starting dredging pit with the temporary piping delivery fixing stand arranged on the more forward side (near the reaching dredging pit) of the completed pipe as the turning point Completed pipes can be sent out together with unfinished pipes that perform work.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a portion from a shaft to a horizontal shaft tunnel, and shows a state in which a long hollow tube is lowered into the shaft. 2 and 3 are enlarged schematic perspective views of the vicinity of the pull-in carriage disposed at the bottom of the shaft in FIG. These figures give an overview of the submarine tunnel construction in which the horizontal tunnel B is connected horizontally to the lower part of the start shaft A excavated vertically from the ground surface. It is assumed that an arrival shaft (not shown) similar to the starting shaft is constructed after passing through a horizontal shaft tunnel B having a diameter of about 12 meters at 35 m and a length of several hundred meters. The method of carrying a long hollow pipe into a horizontal tunnel according to the present invention is as long as possible in the horizontal tunnel B when a plurality of lines of pipes are laid in the horizontal tunnel B represented by such an example. The hollow tube 5 can be safely carried in, and when laying work is performed in parallel from both of the two shafts, both shafts become starting shafts.
[0015]
As shown in FIG. 1, an upper temporary stage 1 is extended to the ground surface opening A2 of the starting shaft A, while a bottom A1 of the starting shaft A constructed one step lower than the opening of the horizontal tunnel B. The lower temporary stage 3 is installed in the upper and lower temporary stages 1, 3 so that the vertical shaft is spaced apart at regular intervals along the starting shaft side wall surface A3 facing the opening of the horizontal tunnel B. A guide wire 2 is stretched parallel to the direction. In addition, the upper temporary stage 1 is devised so that a fence higher than the ground surface is formed near the center of the starting shaft A and functions as a fall-preventing fence, and the starting shaft A where the upper temporary stage 1 is not provided. A fall prevention fence A22 is separately provided around the opening A2.
[0016]
In the vicinity of the lower end of the guide wire 2, a retractable carriage 4 that can move into the horizontal tunnel B is disposed. As shown in FIGS. 2 and 3, the pull-in cart 4 of this example is manually slid along two parallel temporary tracks 41 laid from the vicinity of the lower end of the guide wire 2 into the horizontal tunnel B. Although it moves, it is good also as a drive trolley | bogie provided with power sources, such as a battery. Two support columns 42 and 42 are erected on the upper surface of the pull-in carriage, and a connecting member 44 is pivotally supported on a rotating shaft 43 spanned between the support columns 42 and 42.
[0017]
Returning to FIG. 1, the long hollow tube 5 is suspended and lowered into the start shaft A by the crane CR. When the suspension is lowered, the lower pipe suspension 51 is attached to one end side of the long hollow tube 5, while the upper pipe suspension 52 is attached to the other end side of the long hollow tube 5. . The lower pipe hanger 51 and the upper pipe hanger 52 are temporarily fixed to the long hollow pipe 5 using fixing bolts 521 or the like. In this example, the hanger wire CR1 from the crane CR is used as the upper pipe. Since the through hole 522 formed in the hanging tool 52 is inserted into the long hollow tube 5 and the tip of the hanging wire CR1 is connected and fixed to the lower pipe hanging tool 51, it is suspended by the crane CR. Even when lowered, the long hollow tube 5 maintains the vertical state. For the connection and fixation between the tip of the suspension wire CR1 and the lower pipe suspension 51, a method of inserting a pin into the annular portion at the tip of the suspension wire CR1 is suitable for the convenience of subsequent removal.
[0018]
Further, in order to stably perform the hanging down operation of the long hollow tube 5, the upper pipe suspension 52 and the guide wire 2 are connected using a snap hook 523 or the like. Since the snap hook 523 is loosely fitted to the guide wire 2, the upper pipe suspension 52, that is, the upper end portion of the long hollow tube 5 is not separated from the guide wire 2, and is long along the guide wire 2. That is, the hollow tube 5 descends vertically stably.
[0019]
When the long hollow tube 5 suspended and lowered by the crane CR one by one reaches the bottom A1 of the starting shaft A (the lower temporary stage 3 in this example), the connecting portion 511 extending from the lower pipe suspension 51 is provided. Is connected to the connecting member 44 in the pull-in cart 4 (see FIG. 2). After the connection between the two, the long hollow tube 5 is continuously lowered, and the pull-in cart 4 is moved in the direction of the side tunnel B with assistance from an operator as necessary.
[0020]
FIG. 3 shows a state in which the pulling carriage 4 is moved in the direction of the horizontal tunnel B from the state where the lower pipe suspension 51 and the pulling carriage 4 shown in FIG. 2 are connected. As shown, the long hollow tube 5 gradually falls down to 5a-5b-5c as the retracting carriage 4 moves. During this time, the upper pipe suspension 52 is connected to the guide wire 2, so that the long hollow tube 5 is finally placed in parallel with the temporary tracks 41, 41 of the retracting carriage 4, that is, in a horizontal state. It will be. The connection between the pull-in carriage 4 and the lower pipe hanger 51 is released, and both the lower pipe hanger 51 and the upper pipe hanger 52 are detached from the long hollow tube 5, and the suspended wire is drawn from the long hollow tube 5. When CR1 is removed, the work of moving down the long hollow tube 5 is completed.
[0021]
The long hollow tube 5 placed in a horizontal state by the above-described work is composed of a roller conveyor (not shown) arranged in parallel on both sides of the temporary tracks 41 and 41 of the pull-in carriage 4 and a horizontal tunnel. It will be transferred into the horizontal tunnel B by the hanger trolley disposed on the upper surface of B. Before the long hollow tube 5 is placed horizontally, for the convenience of rolling work placed on a roller conveyor or hanging work by a hanger trolley, as shown in FIG. After passing, a suitable number of pipe cradles 45 may be bridged over the temporary tracks 41, 41 as appropriate. By setting the upper surface of the pipe cradle 45 to be the same height as the upper surface of the roller conveyor, the long hollow tube 5 placed on the pipe cradle 45 can be very easily placed on the roller conveyor. It is possible to move to.
[0022]
The long hollow tube 5 carried into the side tunnel B as described above is welded in advance at a plurality of positions in a welding work place provided near the entrance of the side tunnel B. FIG. 4 is a vertical cross-sectional view of a portion from the entrance of the horizontal tunnel B to the temporary storage place for the unfinished pipe through the welding work place, and the direction in which the pull-in carriage 4 at the left end is seen is the start shaft A side. Within the horizontal tunnel B, frames L1 to L9 are provided in a cross-sectional direction at a plurality of locations at predetermined intervals. FIG. 5 is a front view showing an example of each of the frames L1 to L9 as seen in the length direction of the horizontal tunnel B. Both the right and left sides of the circular horizontal tunnel B cross section through the passage B1 in the center portion In this case, the pipes are laid on each shelf portion.
[0023]
FIG. 5 shows a state in which a guide roller G is temporarily installed between each pipe and the shelf portion. The guide roller G is preferably a bobbin-shaped one in which two left and right ridges are erected in accordance with the width of the pipe on the roller portion, and each of the racks L1 to L9 is provided with a substantially C-shaped clip. Used by fastening and fixing.
[0024]
Now, referring back to FIG. 4, in the horizontal pit tunnel B of this example, the five frames from the first frame L1 to the fifth frame L5 are temporarily set from the start shaft A side to secure each work place. The hanger trolley H is temporarily installed on the ceiling surface in the horizontal tunnel B from the third frame L3 to the fifth frame L5. Below the hanger trolley H is secured as an efficient welding work place in which a turning roller TR is disposed at an appropriate position. In this welding work place, two long hollow tubes 5 lowered and carried from the starting shaft A are provided. The state where it is weld-connected one by one is shown. Thus, the number of the long hollow tubes 5 to be welded in advance is not limited to two as in this example, but may be determined by the length that can be secured as a welding work place, the number of workers, and the like.
[0025]
The two long hollow pipes 5 welded to each other are suspended by the hanger trolley H as unfinished pipes 50, and each unfinished pipe is set as a temporary storage area from the sixth frame L6 to the frame L9 located on the arrival shaft side. The completed piping 50 is temporarily placed on the shelf position where the piping is scheduled to be laid. At this time, in order to facilitate the delivery of the unfinished pipe 50 temporarily placed at each shelf position, a guide roller is temporarily installed on each shelf as shown in FIG.
[0026]
The temporarily placed unfinished pipe 50 is sequentially sent in the direction of the reaching shaft and welded to form a finished pipe 500. FIG. 6 is also a vertical cross-sectional view of the horizontal tunnel B, and shows the area up to the connection work site after the ninth frame L9 following FIG. In FIG. 6, the completed pipe 500 is laid in three stages in the vertical direction on the left shaft side of the shaft in FIG. 6, and the temporary pipe is sent between the 15th frame L15 and the 16th frame L16 on which the completed pipe 500 is placed. A fixed base 7 is installed. A winch wire 61 is stretched between the temporary pipe sending fixed base 7 and a temporary winch 6 (see FIG. 1) provided near the lower end of the guide wire 2 in the starting shaft A. The front end of 61 is turned back to the starting shaft A side again via a plurality of pulleys K2, K4, etc. in the temporary pipe delivery fixed stand 7, and the vicinity of the final end of the completed pipe 500 (until the unfinished pipe 50 until just before welding connection). Yes, it is connected to the newly completed pipe 500). A connection point between the tip of the winch wire 61 and the completed pipe 500 is shown as a Y point in FIG. Note that the point X in FIG. 6 is a welded portion between the rearmost end of the completed pipe 500 and the incomplete pipe 50 (however, the incomplete pipe 50 becomes a part of the completed pipe 500 by this welding connection). .
[0027]
FIG. 7 is a schematic perspective view showing an arrangement state of the winch wire 61 connected from the temporary winch 6 to the unfinished pipe 50 through the temporary pipe sending and fixing base 7. In the illustrated example, a load meter 62 is provided on the winch wire 61 between the temporary winch 6 and the temporary pipe delivery fixing stand 7, and the tip of the winch wire 61 is not yet connected via a total of four pulleys K1 to K4. The state where it is connected to the completed pipe 50 at the point Y is shown. The unfinished pipe 50 and the finished pipe 500 are both placed on the guide rollers G temporarily installed on the shelves of the frames L14, L15, and L16, and the tip of the unfinished pipe 50 hits the end of the finished pipe 500. It will be welded at point X in contact. When the winch wire 61 is wound up by the temporary winch 6 after the welding connection, the completed pipe 500 together with the unfinished pipe 50 is sent to the reaching shaft side.
[0028]
As described above, the first step of temporarily placing the unfinished pipe 50 in which a plurality of long hollow tubes 5 carried from the starting shaft A are welded and connected to the arrival shaft side from the welding work place is temporarily placed. A second pipe 50 is installed on a guide roller G at a predetermined position of the frame L, brought into contact with the rearmost end of the finished pipe 500 and welded, and then sent to the final shaft using the winch wire 61. Since the process can be performed in parallel, if the parallel processing of the first process and the second process is a day work, the work location is limited to the start shaft A in the horizontal tunnel. Work efficiently.
[0029]
【The invention's effect】
In the method for carrying a long hollow tube into a horizontal shaft tunnel according to the present invention, the inside of the starting shaft is set in a vertical state and suspended and lowered, so that it is not restricted by the maximum diameter of the shaft. Since it becomes possible to carry in the empty pipe, it is possible to reduce the number of welding connection work steps to be performed later in the horizontal tunnel and to reduce the construction cost. In addition, since the long hollow tube is lowered along the guide wire, it does not come into contact with structures such as starting shafts, and the horizontal direction can be continuously extended from the suspended lowering work by using the retracting carriage. Since it can be converted, it is not necessary to hang again on the long hollow tube in the vertical state, and it can be transferred into the side tunnel very efficiently and safely.
[0030]
In the horizontal tunnel tunnel laying method according to the present invention, the welding work site, temporary storage site, and connection work site are concentrated in the vicinity of the entrance in the horizontal shaft tunnel, which improves work efficiency and improves utility, safety and environmental equipment. Simplification can be achieved. In addition, the direction of the pulling of the winch wire extending from the winch temporarily installed in the welding workshop was changed by a temporary pipe delivery fixed stand provided in the middle of the horizontal tunnel, and then connected to the unfinished pipe. Since it is possible to contact and adjust the delivery work reliably and quickly, it can contribute to safety work, and the overall length of the winch wire can be kept short, which is economical.
[0031]
Further, since the guide roller is disposed on the shelf of the frame, the friction coefficient at the time of sending out the finished pipe or the like is reduced, so that the winch can be downsized, the winch wire can be reduced in diameter, and the pipe can be prevented from buckling.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a portion from a shaft to a horizontal tunnel.
2 is an enlarged schematic perspective view of the vicinity of a pull-in carriage disposed at the bottom of the shaft in FIG. 1. FIG.
FIG. 3 is a schematic perspective view showing a state in which the retracting carriage is moved in the direction of the side tunnel in FIG. 2;
FIG. 4 is a longitudinal sectional view of a portion from an entrance of a horizontal tunnel through a welding work site to a temporary storage place for unfinished piping.
FIG. 5 is a front view showing a state in which an example of each frame is viewed in the length direction of the horizontal tunnel.
FIG. 6 is a longitudinal sectional view of a horizontal tunnel B illustrating the area up to the connection work site after the ninth frame following FIG. 5;
FIG. 7 is a schematic perspective view showing an arrangement state of a winch wire connected from a temporary winch through a temporary pipe sending and fixing base to a newly completed pipe.
[Explanation of symbols]
A Starting shaft B Horizontal shaft tunnel CR1 Suspension wire 1 Upper temporary stage 2 Guide wire 3 Lower temporary stage 4 Pull-in carriage 5 Long hollow pipe 6 Temporary winch 7 Temporary pipe delivery fixed stand 51 Lower pipe suspension 52 Upper pipe suspension

Claims (2)

In this method, the long hollow tube is lowered into the horizontal tunnel connected to the lower part of the starting shaft, and a guide wire is vertically stretched on the side surface of the starting shaft opposite to the opening of the horizontal shaft tunnel, A retractable carriage that is movable from the vicinity of the lower end of the guide wire into the horizontal tunnel is disposed, and an upper pipe hanger and a lower pipe hanger are temporarily fixed to both ends of the long hollow pipe, respectively. With the suspension wire connected to the vertical hollow pipe, the long hollow pipe is vertically lowered into the starting shaft, the upper pipe suspension is connected to the guide wire, and then the long hollow pipe is further lowered to lower the pipe suspension. The long hollow tube is horizontally placed by moving the tube into the horizontal shaft tunnel while being connected to the pull-in carriage, and the method for carrying the long hollow tube into the horizontal shaft tunnel. A guide roller is temporarily installed on a frame provided at a plurality of locations at a predetermined interval in the horizontal tunnel, and a winch wire is provided from a temporary winch provided near the starting dredging shaft with a temporary pipe feed fixed installation installed in the middle of the horizontal tunnel as a turning point. A first step in which a plurality of long hollow pipes carried from the starting shaft are welded together and then moved from the welding work site to the ultimate shaft and temporarily placed, and temporarily placed unfinished piping Is installed on a guide roller at a predetermined position of the frame, brought into contact with the rearmost end of the finished pipe and welded, and then the second step of sending the finished pipe toward the reaching shaft using the winch wire; The method for laying piping in a horizontal shaft tunnel using the method for carrying in a horizontal tunnel of a long hollow tube according to claim 1, wherein the method is carried out in parallel.

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