JPH0574646B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of excavating a hole in an impermeable wall and an excavating device thereof, and is particularly applicable to the construction of an impermeable wall for underground dams, an impermeable wall for preventing liquefaction, etc. The present invention relates to a suitable method for excavating a hole in an impermeable wall and a device for excavating the same.

[Conventional technology]

When excavating a hole in an impermeable wall in a remote island or mountainous area where the natural water level is low, the water level in the hole cannot be maintained due to severe water loss in the upper layer, so a dry excavation method that does not use water is recommended. Excavation must be carried out by Conventionally, a trench hole is formed by first drilling circular holes (pilot holes) with a circular cross section at predetermined intervals, and then drilling between the holes with a chainsaw cutter and dropping slime from the drilling into one of the holes. do. Then, the slime accumulated in the circular hole is removed using a club hammer or a hanging bucket to form a one-element slot.

Alternatively, according to the underground wall trench construction method described in Japanese Patent Publication No. 59-20820, a pit is excavated in advance at two separate points on the planned line for constructing an underground wall, and pillar materials are erected in the pit. A string-like tension member (chain cutter) having a stone cutting tool is attached to a hanging frame that moves up and down using the pillar material as a guide rail, and the string-like tension member is driven in a substantially horizontal direction by a drive device. A method is disclosed in which a thin-walled excavation hole is excavated between the pits, and the excavated debris is dropped into the pit and then carried out by an appropriate means.

[Problem to be solved by the invention]

However, when excavating a hole in an impermeable wall using the former method, three steps are required: (1) drilling a circular hole, (2) excavating a hole in an impermeable wall, and (3) removing soil, which increases the number of man-hours for excavation. There is a drawback that it does. In addition, since the hole is a single hole, the hole bends, and when adjacent water-shielding wall holes are jointed, there is a problem in construction that the water-shielding wall holes become misaligned and cannot be connected accurately.

Additionally, when excavating to a place where there is water, limestone and other cuttings may float in the water or dissolve, making it impossible to completely remove the soil, and slime may adhere to the stubs, making excavation difficult. be.

In addition, the method described in the latter publication includes (1) drilling a circular hole, (2) installing pillars, (3) drilling a hole in an impermeable wall, and (4) removing earth.
The disadvantage is that the number of man-hours increases. That is, since the impermeable wall hole is excavated by dropping excavated debris into a pre-excavated shaft, it is necessary to pull up the excavator and remove the excavated debris, which is time-consuming. Furthermore,
Since the stone cutting tool has a predetermined directionality, the chain cutter can only be driven in one direction. Therefore, there is a problem that excavation sludge concentrates in one of the shafts, resulting in poor excavation efficiency. Further, even if the driving direction of the chain cutter can be changed, the cutter blade has no directionality and there remains a problem in cutting performance.

The present invention was made in view of the above circumstances, and it is possible to save man-hours and reduce construction costs for construction of impermeable walls, and also allows for excavation and drainage without being affected by the level of water level in the hole. An object of the present invention is to provide a method for excavating holes in an impermeable wall that can precisely join between holes in an impermeable wall made of soil, and an excavation device for the same.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a pair of bucket belts or a pair of wing bits that are each replaceably attached to an excavator body formed in an oblong shape. When the bucket is used, a drilling device equipped with a chain cutter and equipped with a sand pump and a discharge pipe for transporting excavated waste with muddy water is used. The earth and sand are introduced into the bucket through the opening formed in the bucket, and a thin-walled excavation hole is excavated between the circular holes using the chain cutter, and the earth and sand is introduced into the bucket from the upper opening. If there is a lot of groundwater and the cutting dust floats and settles in the bucket and cannot be stored, replace the bucket with a wing bit and remove the sand from the bucket. While continuing to excavate a pair of circular holes with the wing bit using the pump and the drain pipe,
A thin-walled excavation hole is excavated between the circular holes using the chain cutter and the soil is introduced into the circular hole, and the soil in the circular hole is sucked up by the sand pump from the suction port of the earth removal pipe, and the slurry is transported and discharged. It is characterized by excavating an impervious wall hole by laying soil.

[Effect]

According to the present invention, when the groundwater level is low, soil is introduced through the openings formed at the bottom of the buckets 28A, 28B while excavating a pair of circular holes with the buckets 28A, 28B. Then, a thin-walled excavation hole is excavated between the circular holes using chain cutters 26A, 26B, and the soil is introduced into the upper openings of the buckets 28A, 28B to discharge the soil stored in the buckets 28A, 28B. Drill the impermeable wall hole by repeating the soiling process. Therefore, even in locations where it is impossible to maintain the water level in the hole, dry excavation can be performed with a labor-saving soil removal process. In this case, the sand pumps 29A and 29B may be mounted.

In addition, when the excavator main body 22 reaches the groundwater level, the vertical shaft 32 is moved as necessary to increase soil removal efficiency.
Bucket 28A, 2 attached to A, 32B
8B are replaced with wing bits 36A and 36B, and earth removal pipes 38A and 38B connected to sand pumps 29A and 29B are installed to the ground. Then, circular holes are excavated using wing bits 36A and 36B instead of buckets 28A and 28B, and a thin-walled excavated hole is created between the circular holes using a chain cutter 2.
While excavating with 6A and 26B, the earth and sand is led to circular holes at both ends, and the earth is discharged by transporting muddy water through earth discharge pipes 38A and 38B. Therefore, cutting dust can be reliably discharged, and efficient excavation can be performed without slime adhering to the cutter.

Furthermore, when excavating adjacent impermeable wall holes, two buckets should be placed in the round holes of the impermeable wall holes drilled for each pitch.
8A, 28B or wing bit 36A, 36B
is inserted, and new water-shielding wall holes are successively formed using the existing circular holes as guide holes to connect the water-shielding wall holes. This makes it possible to easily obtain well-matched water-shielding wall holes.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the impermeable wall hole excavation method and the excavation apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a case where an impermeable wall construction work is performed using an impermeable wall hole drilling apparatus according to the present invention. In FIG. 1, a crane 10 is placed on the ground surface, and an impermeable wall excavation device 12 is suspended and supported by the crane 10 via a rope 14. The crane 10 is also provided with a cable reel 16 and a guide roller 18 , one end of a cable 20 that supplies power to the excavation rig 12 is wound around the guide roller 18 , and the other end is connected to the water-shielding wall excavation rig 12 . has been done. A baby winch 17 is also arranged to suspend and support the earth discharge pipe (or hose) from the sand pump 29.

FIG. 2 is a front view of the impermeable wall hole drilling device 12 according to the present invention inside the excavation hole, and FIG. 3 is a plan view showing the excavation hole excavated using the impermeable wall drilling device 12 of FIG. 2. be. The impermeable wall excavation device 12 shown in FIG.
The main composition is B.

The excavator main body 22 includes a hanger 21 for hanging,
21 is attached and supported by the crane 10 via hangers 21, 21 so as to be vertically movable. Further, drive sources 24,
24 is provided, and a cable 20 shown in FIG. 1 is connected to the drive sources 24, 24. Furthermore,
Gear mechanisms 30A and 30B are disposed below the left and right drive sources 24 via reducers 23 and 23, and chain cutters 26A and 26B and vertical shafts 3
The driving force is transmitted to 2A and 32B. The vertical shafts 32A and 32B are driven to rotate in opposite directions of arrows A and B by the action of the gear mechanisms 30A and 30B, thereby canceling out the excavation torque during excavation. vertical axis 3
Buckets 28A, 28B shown by two-dot chain lines or wing bits 36A, 36B shown by solid lines are attached to 2A, 32B via flanges 34A, 34B.
can be installed.

The bucket bags 28A, 28B have a cylindrical main body, a bottom lid that can be opened and closed, and a flange (not shown) that is detachable from the flanges 34A, 34B. A cutting cutter (not shown) for excavation is fixed to the bottom cover, and an opening is formed through which earth and sand generated when drilling a circular hole is introduced. Furthermore, an opening is formed in the upper part of the bucket main body, through which the earth and sand excavated by the chain cutters 26A and 26B are introduced from above.

The wing bits 36A, 36B have a cutting cutter fixed to the lower part of the wing-shaped bit body, and are connected to the vertical shafts 32A, 3 through the flanges 34A, 34B.
It can be attached to 2B.

Furthermore, chain cutters 26A and 26B are disposed on the sides of the gear mechanisms 30A and 30B in a cantilevered manner and facing each other along the excavator main body 22. Chain cutters 26A and 26B have cutting blades 31 and 31.
... are fixed symmetrically. The chain cutters 26A and 26B are driven to rotate in opposite directions in the directions of arrows C and D, as shown in FIG.

Furthermore, high-lift sand pumps 29A and 29B are arranged above the drive source 24, and the sand pumps 29
Sand pumps 9A and 29B have a predetermined lift depending on the excavation depth of the impermeable wall hole, etc., and the sand pumps 29A and 29B can also be removed. usually,
Sand pumps 29A, 29B are connected only to installed earth discharge pipes 38A, 38B and cables 20A, 20B. Wing bit 36A, 36
On the side of B is the suction port 3 of the earth discharge pipes 38A and 38B.
9A and 39B are arranged. As a result, when using wing bits 36A and 36B, the earth removal pipe 38
Sediment is transported by muddy water by A and 38B. In addition, the soil discharge pipes (or hoses) 38A and 38B are placed on the mud screen on the ground surface, and after the mud screen separates the muddy water into soil and water,
Circulate water into the hole again.

FIGS. 4a, 4b, and 4c are explanatory diagrams showing the working procedure of the impermeable wall hole excavation method according to the present invention. If the groundwater level is low during excavation, as shown in FIGS. 3 and 4a, a pair of circular holes 40 are excavated using buckets 28A and 28B, and a thin-walled excavated hole 42 is also formed between the circular holes 40. The earth and sand excavated by the chain cutters 26A and 26B are introduced into the buckets 28A and 28B from the upper openings. Once the inside of the bucket is filled with earth and sand, the excavator 12 is
The earth and sand are removed by lifting the container to the ground and opening the bottom covers of the buckets 28A and 28B (dry earth removal method).

In addition, when the buckets 28A and 28B reach the groundwater level and the soil cannot be removed efficiently with the buckets, the buckets 28A and 28B are moved to the wing bits 36A and 3.
6B, replenish water in the borehole to the excavation hole as necessary, and excavate the circular hole 40. At the same time, cut a thin-walled excavation hole 42 between the circular holes 40 using chain cutters 26A, 26.
Excavate at point B and lead the soil to the circular hole 40. Round hole 4
The earth and sand led to 0 are wing bits 36A, 36
Suction port 3 of soil discharge pipe 38A, 38B provided between B and the chain cutter 26A, 26B
Mud water is transported from 9A and 39B. Therefore, the earth and sand generated during excavation is reliably discharged to the ground surface via the soil discharge pipes 38A and 38B (wet soil discharge method).

Next, a method for excavating a hole in an impermeable wall according to the present invention using the excavating apparatus constructed as described above will be explained with reference to FIGS. 4a, b, and c. First of all, the fourth
In figure a, the vertical shaft 32A, 3 of the drilling rig 12
While a pair of circular holes are excavated using buckets 28A and 28B attached to 2B, a thin-walled excavated hole is excavated between the circular holes using chain cutters 26A and 26B. The earth and sand excavated by the chain cutters 26A and 26B are stored in the bucket main body through the upper openings of the buckets 28A and 28B, and the earth and sand excavated by the buckets 28A and 28B are stored in the bucket main body from the lower openings. After the buckets 28A and 28B are filled with earth and sand, the excavator 1 is temporarily removed as shown in Fig. 4b.
2 to the ground by the crane 10, and the bottom covers 31A and 31B (not shown) of the buckets 28A and 28B are opened and the earth is discharged. Therefore, the effort required for soil removal is minimized. In this way, by repeating excavation and soil removal, the bucket was brought down to the groundwater level by 28 minutes.
Excavation is performed using A, 28B and chain cutters 26A, 26B.

Next, after the sand pumps 29A, 29B reach the groundwater table, the buckets 28A, 28B are replaced with wing bits 36A, 36B. Also, cables 20A and 20B for supplying power to the sand pumps 29A and 29B are attached. Furthermore, the earth discharge pipe 38
A, 38B are connected to sand pumps 29A, 29B, one end is placed on the mud screen 46 on the ground, and the other end suction ports 39A, 39B are placed on the side of the wing bits 36A, 36B. Then, as shown in FIG. 4c, the wing bits 36A, 36B
Further excavation is performed to a predetermined depth. During excavation, the earth and sand generated by the chain cutters 26A and 26B are guided into the circular holes and removed through the earth removal pipes 38A and 3.
Mud water is transported from the side suction ports 39A and 39B of 8B. Therefore, reliable soil removal is possible without slime such as limestone floating in water or dissolving. Furthermore, since slime does not adhere to the stub, efficient excavation can be performed.

FIG. 5 is an explanatory diagram showing a case where continuous impermeable wall holes are constructed using the impermeable wall hole drilling apparatus according to the present invention. First, 1 element impermeable wall drilling hole 4
8, 50... are excavated one pitch at a time as shown in Figure 5. Next, the circular hole 48A of the water-shielding wall hole 48,
Bucket 28A, 2 is placed in the circular hole 50A of the water-shielding wall hole 50.
8B or wing bits 36A and 36B are inserted, and while guiding the impermeable wall drilling device 12 through the circular holes 48A and 50A, a thin-walled excavation hole 5 is formed between the circular holes 48A and 50A using chain cutters 26A and 26B.
Drill 2. Therefore, the impermeable wall excavating device 12 is guided by the circular holes 48A, 50A and smoothly guided to a predetermined position, and can accurately join between the impermeable wall holes 48, 50. Thereby, continuous water-shielding wall holes with high consistency can be easily obtained.

〔Effect of the invention〕

As explained above, according to the impermeable wall hole excavation method and its excavation device according to the present invention, when the water level in the hole cannot be maintained when excavating an impermeable wall hole, dry excavation is performed using a bucket. The excavated slime is removed by this method. Therefore, there is no need to drill a pilot hole in advance, and even in a place where the natural water level is low and the ground has a high coefficient of permeability, drilling of the impermeable wall hole can be carried out efficiently.

In addition, when there is too much water in the hole and soil cannot be removed efficiently using a bucket, the bucket is replaced with a wing bit and wet excavation is performed in which mud is transported using a pump. Therefore, the soil can be reliably removed without floating cutting dust, so slime will not adhere to the stubs, and the excavation can be carried out with labor-saving soil removal process.
It is possible to reduce the number of excavation steps.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a case where impermeable wall construction work is performed using the impermeable wall hole drilling apparatus according to the present invention, and Fig. 2 is a schematic diagram showing the impermeable wall hole excavating apparatus according to the present invention during wet operation. A front view inside the excavation hole, FIG. 3 is a plan view showing the excavation hole drilled using the impermeable wall excavation device of FIG. 2, and FIGS. 4 a, b, and c show the impermeable wall hole according to the present invention. FIG. 5 is an explanatory diagram showing the working procedure of the excavation method of FIG. 12...Drilling equipment, 22...Drilling machine body, 24
...Drive source, 26A, 26B...Chain cutter, 28A, 28B...Bucket, 29A, 29
B... Sand pump, 32A, 32B... Vertical shaft, 36A, 36B... Wing bit, 38
A, 38B...Earth removal pipe.

Claims (1)

[Scope of Claims] 1. A pair of bucket belts for dry excavation or a pair of wing bits for wet excavation are each replaceably attached to an excavator body formed in an oblong shape, and the pair of bucket belts or the pair of wings A chain cutter is installed between the bits, and a drilling rig that can be equipped with a sand pump and an earth removal pipe to transport excavated waste with mud is used to carry out the dry excavation process until the depth of the impermeable wall hole reaches the groundwater level. While digging a pair of circular holes with the bucket, earth and sand are introduced from the opening formed at the bottom of the bucket, and at the same time, a thin-walled excavation hole is excavated between the holes with the chain cutter, and the earth and sand are introduced into the hole. An impermeable wall hole is excavated while repeating the process of introducing water into the bucket from the upper opening and discharging the earth and sand in the bucket, and when the depth of the impermeable wall hole reaches the groundwater level, the bucket is replaced with the wet method. While replacing the wing bit with a wing bit for excavation, and using the sand pump and earth removal pipe, while continuing to excavate a pair of circular holes with the wing bit, a thin-walled excavated hole was created between the circular holes with the chain cutter. excavate and guide the soil into the circular hole,
1. A method for excavating an impermeable wall hole, characterized in that the impermeable wall hole is excavated by sucking up the earth and sand in the circular hole from the suction port of the earth discharge pipe by the sand pump, transporting mud, and discharging the earth. 2. An excavator main body formed in a horizontally elongated shape; a drive source mounted on the excavator main body; a sand pump mounted on the excavator main body; and a sand pump disposed on both sides of the excavator main body, and the drive source a pair of vertical shafts rotationally driven by a pair of vertical shafts; a pair of drilling bits provided on the pair of vertical shafts; a pair of chain cutters disposed laterally between the pair of vertical shafts; An impermeable wall hole drilling device characterized by: