JP5524642B2 - Cutting method - Google Patents

Description

  The present invention relates to an open-cut method, and more particularly, to an open-cut method useful in laying underground pipes such as water and sewage pipes and gas pipes and other underground objects.

  When burying pipes such as water and sewage pipes, gas pipes, protective cables for power transmission cables, optical fiber cables for communication, etc. in the ground, excavating grooves from the ground to the ground, laying pipes in the grooves, joining them, In many cases, a so-called open-cut method is used in which a groove is backfilled with a backfilling material after inspection, anticorrosion work, etc. are performed. In this excavation method, first, a road pavement surface is cut into a square with a cutter, and the pavement surface is peeled off. Next, in order to prevent the side wall of the groove to be excavated from collapsing, a steel sheet pile is driven along the side surface of the groove, and an abdomen and a cut beam are arranged at a predetermined interval. In this way, the inside of the sheet pile is excavated to a predetermined depth with a machine. And after carrying in the pipe | tube buried in the excavated groove | channel and performing a series of piping work, the groove | channel is backfilled with backfill soil. In addition, along with this backfilling, the cut beams, upsets, sheet piles, etc. are sequentially removed by a machine. This type of cutting method is described in Patent Document 1 and the like.

Japanese Patent Publication No. 8-199573 (paragraphs 0002 and 0003)

  However, in the conventional open-cut method, when excavating hard ground, compared to excavating relatively soft ground, it takes a lot of time to excavate the groove, the construction period is significantly longer, There is a problem that the cost increases as the construction period becomes longer.

  The present invention solves such a conventional problem, and in this type of excavation method, even when excavating hard ground, the time required for excavation of the groove is greatly increased compared to the conventional excavation method. The purpose is to shorten the construction period and reduce the cost.

To achieve the above object, the present invention is to excavate the ditch in the ground from the surface, after laying underground buried object in the groove, in the open-cut method to return embedding the groove, prior to drilling of the grooves, surface The edge of the excavation surface is cut with a cutter, and this is used as an excavation line. The drilling is performed from the ground surface to the ground by a drill over the entire excavation surface except for the vicinity of the excavation line of the excavation surface. Constructing a plurality of holes for the machine, along the excavation line inside the excavation line of the excavation construction surface, to construct a plurality of holes for the excavation line from the ground surface to the ground by a drill , This is the gist.
In this case, smaller than the diameter of the pores for the diameter of the holes for drilling line Wariiwa machine, it is preferable to drilling at short intervals adjacent pores for a plurality of drilling line with each other.
Further , in this case, each hole is backfilled with a backfill material until the excavation of the groove is started after the construction of the plurality of holes, and when starting or after starting the excavation of the groove, It is preferable to remove the backfill material.

According to the excavation method of the present invention, a plurality of holes are made in the ground for excavating the groove prior to excavating the groove in the ground. Compared with the conventional excavation method, the time required for excavation of the groove can be greatly reduced, the construction period can be shortened, and the cost can be reduced by the shortening of the construction period. it can.
In addition, since multiple holes are drilled over the entire surface of the excavation work as holes for the split rocker, even with hard rock, the split rock can be efficiently performed by the split rocker, and crushing and excavation can be performed quickly. . And, by drilling a plurality of holes for excavation line along the edge of the excavation edge of the excavation work surface, a groove having a predetermined size and shape can be quickly and reliably formed in a predetermined range of the ground. Can be excavated. These points can also contribute to shortening the construction period and reducing costs.
In addition, after constructing a plurality of holes, it is possible to backfill each hole with a backfill material until the start of excavation of the groove, so that there is no problem in traffic on the road, and conventional road surface lining (main cover) Installation of temporary equipment such as construction and temporary lining) is not required, so the entire construction period can be shortened by the amount of time required for this road surface lining, and only the cost required for this road surface lining. The cost can be reduced.

The figure which shows the flow of the cutting method in one embodiment of this invention Schematic plan view showing the construction status of holes by pre-boring work of the same method Schematic vertical cross-sectional view showing the state of hole construction by pre-boring work Schematic plan view showing the construction status of excavation work by this method Schematic plan view showing the construction status of the construction method by the split rock work Schematic plan view showing the construction status by backfilling work of the method

Next, embodiments for carrying out the present invention will be described with reference to the drawings. In this embodiment, an example of the construction of a new water pipe will be described, and the open-cut method according to the present invention will be described.
FIG. 1 shows the flow of the excavation method related to this construction. As shown in FIG. 1, this excavation method includes road cutter construction (step 1), pre-boring work (step 2), excavation and mountain retaining work (step 3), split rock work (step 4), and finishing excavation work (step 5). ), Water pipe piping work (step 6), and backfilling work (step 7).

  First, in the road cutter construction in Step 1, the asphalt pavement surface of the road is cut into a square along the edge of the road excavation construction surface (hereinafter referred to as excavation line) with the cutter.

The next pre-boring operation in step 2 is performed prior to the excavation work of the groove. In this operation, a plurality of holes are constructed from the ground to the rock in the ground for excavating the groove by a hydraulic crawler drill.
FIG. 2 and FIG. 3 show the construction state of the holes. As shown in FIG. 2 and FIG. 3, in this drilling operation, a plurality of holes 10 are made into holes 101 for a rock rock machine, and the excavation work surface is generally except for the vicinity of the excavation lines 2 and 2 on both sides of the excavation work surface 1 on the surface. A plurality of holes 10 are drilled along the excavation lines 2 and 2 inside the excavation lines 2 and 2 on both sides of the excavation work surface 1 as holes 102 for excavation lines. In this case, the holes 101 for the plurality of rock drills are drilled in the excavation work surface 1 in double rows (here, two rows symmetrical in the width direction) at predetermined intervals, and the holes 102 for the plurality of excavation lines are holes 102. The diameter of each of the holes 102 is made smaller than the diameter of the hole 101 for the split rocker, and the holes 102 are drilled at short intervals close to each other in a row along the drilling lines 2 and 2 of the excavation work surface 1. Yes.
Then, until the excavation of the groove after the construction of the holes 10 is started, the holes 10 are backfilled with a backfilling material such as flour, and the holes 10 are restored. It should be noted that the backfill material of these holes 10 is removed when or after the start of the trench excavation.

Subsequently, the process proceeds to excavation and mountain retaining work in step 3. FIG. 4 shows this construction state. As shown in FIG. 4, in this excavation operation, the asphalt pavement surface 3 is first peeled off by back-forcing, and then the soil and the like under the asphalt pavement surface 3 are excavated as primary excavation.
Then, after this primary excavation, the mountain retaining is constructed substantially vertically from the ground surface. That is, a steel sheet pile is driven along the side surface of the groove, and the abdomen and the cut beam are arranged at a predetermined interval. In this way, the inside of this sheet pile is excavated to a predetermined depth with a back fore, in this case to the rock surface.

  Next, the process shifts to the step 4 of rock formation. FIG. 5 shows this construction state. As shown in FIG. 5, in this split rock work, first, the backfill material (pulverized powder) is removed from the hole 10 drilled in the ground, in particular, the hole 101 for the split rock machine, and the bedrock 4 Crushing the rock. In this case, since the rock mass 4 has already been drilled with the hole 101 for the split rocker in step 2, the vicker can be inserted into the immediate hole 101, and the rock mass 4 can be immediately divided.

  Next, the process proceeds to the finishing excavation work in step 5. In this final excavation work, the rock mass is further crushed by a breaker (rock drill), and final excavation is performed.

  Next, the process proceeds to the water pipe piping operation in step 6. In this water pipe piping work, a water pipe buried in a groove excavated in the ground is carried in, and a series of piping work such as positioning, mounting, joining, inspection and coating of the carried water pipe is performed.

  Then, the process proceeds to the backfilling operation in Step 7. FIG. 6 shows this construction state. As shown in FIG. 6, in this backfilling operation, the groove is backfilled using the backfilling material 5, in this case, excavation shear. In this case, first, pile sand is returned into the sheet pile, and then the crushed stone is backfilled as roadbed material. At that time, in a state where the backfilling material 5 is backfilled to a certain height, the cut beams, upsets, sheet piles, and the like are sequentially removed by a machine, and the rest is backfilled. Finally, asphalt pavement is performed to restore the road.

This open-cut method consists of the construction procedures as described above. (1) Workability (2) Construction period (3) Safety (4) Maintenance of buried pipes (5) Environment (6) Economic efficiency Have the advantages.
(1) Workability It is construction by excavation and can be done reliably. In addition, by constructing holes on the excavation work surface, the workability of the corners of the excavation bottom is improved.
(2) Construction period Temporary equipment for the main lining and temporary lining work is not required, and the number of days for rock excavation can be shortened. Therefore, the construction period is short.
(3) Safety It is construction after drilling holes, and since it can be excavated by machine construction, the work of human-powered breakers can be eliminated and safety is high. Since it is excavation work after preliminary destruction, it is difficult for large vibrations to occur and the work time at the same location is short. Since the excavation end is backfilled with excavation shear, there is little risk of collapse.
(4) Conservation of buried pipes Conservation is high because the excavation width does not expand.
(5) Environment Breaker work after drilling, wedge breakage, and crack generation, and no loud noise is generated for a long time. Rock excavation work is completed in a short time.
(6) Economical The construction cost can be kept low because the construction is almost done by machine.

As explained above, in this excavation method, in particular, prior to excavating the groove in the ground, a plurality of holes are constructed in the ground from which the groove is excavated from the surface to the rock, so this is a preliminary fracture of the ground, Excavation can be performed quickly only by machine construction, and compared with the conventional excavation method, the time required for excavation of the groove can be greatly reduced, the construction period can be shortened, and the construction period can be shortened. The cost can be reduced by that amount.
Also, since multiple holes are drilled over the entire surface of the excavation work as holes for the split rock machine, even with hard rock mass, the split rock work can be efficiently performed by the split rock machine, and the crushing and excavation work should be performed reliably and quickly. Can do. And, by drilling a plurality of holes for excavation line along the edge of the excavation edge of the excavation work surface, a groove having a predetermined size and shape can be quickly and reliably formed in a predetermined range of the ground. Can be excavated. These points can also contribute to shortening the construction period and reducing costs.
In addition, after constructing a plurality of holes, it is possible to backfill each hole with a backfill material until the start of excavation of the groove, so that there is no problem in traffic on the road, and conventional road surface lining (main cover) Installation of temporary equipment such as construction and temporary lining) is not required, so the entire construction period can be shortened by the amount of time required for this road surface lining, and only the cost required for this road surface lining. The cost can be reduced.

  In this embodiment, the construction of a new water pipe has been illustrated. However, this excavation method can be used to install water pipes such as water and sewage pipes, gas pipes, power transmission cables, and protective pipes for communication optical fiber cables. It can be applied to various constructions embedded therein, and the same effects as described above can be obtained.

DESCRIPTION OF SYMBOLS 1 Surface excavation construction surface 2 Drilling line 3 Asphalt pavement surface 4 Bedrock 5 Backfill material 10 Hole 101 Hole for split rock machine 102 Hole for drilling line

Claims (3)

In the excavation method of excavating a groove from the ground surface to the ground, laying underground objects in the groove, and then refilling the groove,
Prior to the excavation of the groove, the edge of the excavation work surface on the surface is cut with a cutter, this is used as the excavation line, and the entire excavation work surface except the vicinity of the excavation line is drilled. , Constructing a plurality of holes for the split rocker from the ground surface to the ground, along the excavation line inside the excavation line of the excavation construction surface, by a drill, for the excavation line from the ground surface to the ground Construct multiple holes,
An open-cut method characterized by this. The excavation method according to claim 1, wherein the diameter of the hole for the excavation line is made smaller than the diameter of the hole for the split rocker, and a plurality of holes for the excavation line are formed at short intervals close to each other . After constructing a plurality of holes, each hole is backfilled with a backfill material until the start of excavation of the groove, and when the excavation of the groove starts or after the start, the backfill material is removed from each hole. The cutting method according to claim 1 or 2.

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