JPH0448891B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an excavation device in which a plurality of excavation shafts each having a excavation head attached to the tip thereof are vertically disposed at a required interval, and in particular, The present invention relates to an excavation device used to form a continuous excavation hole group using these plurality of excavation shafts and to construct an underground continuous wall.

[Prior art and its problems] Conventionally, when constructing an underground continuous wall, a drilling device is generally used in which a plurality of drilling shafts each having a drilling head attached to the tip are hung vertically at a required interval. In order to ensure that the drilling holes formed by each drilling shaft form a continuous drilling hole group, a drilling head is attached to the tip of each drilling shaft.
Adjacent excavation shafts are slightly shifted vertically from each other,
The drilling holes drilled by these drilling heads overlap with each other between adjacent drilling shafts.

When constructing an underground continuous wall using such excavation equipment, a group of continuous excavation holes is formed while injecting cement milk etc. with each excavation shaft, and this is repeated. In addition to forming long continuous drill holes, core materials such as H-shaped steel or steel pipes were embedded in appropriate positions of the drill holes.

However, even when the drilling holes formed by the drilling heads attached to the tip of each drilling shaft overlap with each other as described above, as shown in FIG. Since the excavated holes 31 drilled by the method are circular, unexcavation portions 32 remained on both sides of a portion 31a where the excavated holes 31 overlap each other in this excavated hole group 30.

Therefore, the drill hole group 30 formed in this way
When embedding a core material such as H-beam steel in a hole, the core material may come to the position of the excavation hole part 32 of the excavation hole group 30. In this case, the core material is placed against the earth pressure of the excavation part 32 There was a problem in that it had to be pushed in forcefully, which greatly reduced work efficiency.

On the other hand, if the excavation axes are brought closer to each other in order to reduce the remaining portion 32 of the excavation, and the overlapping portion 31a of the excavation holes 31 becomes larger, the excavation hole group 30 excavated at once by this excavation device As the length of the drill hole group 30 becomes shorter, in order to form a long continuous drill hole group 30, the drilling operation has to be repeated many times, resulting in a problem that the workability is significantly reduced.

Furthermore, in forming a long continuous drill hole group 30 by repeating the drilling of continuous drill hole groups 30 as described above, a new drill hole group 30 is created so as to be continuous with the previously drilled drill hole group 30. When attempting to drill a hole, there was a problem in that the drilling axis tends to flow toward the drilled hole group 30 where it has become soft due to being drilled, making it impossible to drill a straight hole.

For this reason, in the past, the
As shown in Japanese Patent Publication No. 63-58977, etc., at least one of the plurality of vertically installed drilling shafts is connected to at least one of the previously drilled drilling hole group 30. It was proposed to form a new drill hole group 30 by inserting it into the hole 31 and thereby guiding the remaining drill shafts.

However, while inserting at least one excavation shaft into the previously excavated borehole 31,
When a new drilling hole group 30 is formed,
The number of newly formed drilling holes 31 is reduced by the number of drilling shafts inserted into the previously dug drilling holes 31,
There was a problem that work efficiency deteriorated significantly.

[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned problems when constructing an underground continuous wall by drilling a continuous group of drilling holes using a plurality of drilling shafts. That is.

That is, in the present invention, when the drilled holes drilled by the drilling head are overlapped by adjacent drilling axes to form a continuous drilled hole group, the drilled holes remaining on both sides of the overlapped portion are Undrilled areas can be easily cut away,
In addition, even when drilling successive drill holes repeatedly to form a long continuous drill hole group, it is possible to drill a new drill hole while inserting the drill shaft into the previously drilled hole as described above. To provide a drilling equipment that can efficiently form long continuous drill hole groups without the drill shaft flowing toward the previously drilled hole side even if the group is not formed.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an excavation device in which a plurality of excavation shafts 10 each having an excavation head 11 attached to the tip thereof are vertically disposed at a required interval. In this case, each of the above-mentioned excavation shafts 10 is rotatably held at a required interval by the holding portion 21 of the connector 20 provided in the direction in which the excavation shafts 10 are lined up, and the excavation shafts 10 are Cutting blades 22 facing upward are attached to both sides of the connecting tool 20 between the holding parts 21 that hold the holding parts 21 and to the side ends of the connecting tool 20, respectively, so as to be able to tilt outward at a predetermined angle.

[Function] In the excavation device configured as described above, the plurality of excavation shafts 10 are gradually lowered while rotating, and the excavation head 11 attached to the tip of each excavation shaft 10 excavates the ground to a required depth. It's starting to dig deeper.

At this time, each of the cutting blades 22 attached to the connecting tool 20 is maintained in an upward position by the earth pressure when digging through the ground, and the cutting blades 22 are kept facing upward.
This prevents any resistance from being added when digging into the ground to the required depth.

Here, the ground is excavated to a required depth by the excavation head 11 attached to the tip of each excavation shaft 10 in this way, and the excavation holes drilled by each excavation shaft 10 are located between adjacent excavation shafts 10. In the case where the drilled holes 31 are overlapped with each other, the drilled hole group thus formed has trench remaining portions 32 on both sides of a portion 31a where the drilled holes 31 overlap, similar to the conventional drilled hole group 30 shown in FIG. remains.

After the excavation head 11 excavates the ground to the required depth, the excavation device is lifted up using a winch or the like and each excavation shaft 10 is raised, and each of the above-mentioned The cutting blades 22 are tilted outward at a required angle due to the earth pressure of earth and sand above them, and as the excavation equipment is pulled up, the cutting blades 22 provided on both sides between the holding parts 21 are tilted outward at a predetermined angle. 31 The excavation holes 32 remaining on both sides of the mutually overlapping portion 31a are cut, and the cutting blades 22 provided at the side ends of the connector 20 are used to cut the excavation holes drilled by the excavation heads 11 on both sides. A protrusion 33 that protrudes laterally from 31
Begins cutting.

In the state where the drilling equipment is pulled up in this way, the portion 3 where the drilling holes 31 overlap each other
The remaining trench portions 32 on both sides of 1a are eliminated, and the protruding portions 3 protrude laterally from the excavated holes 31 on both sides.
A group of boreholes 30 in which 3 holes are drilled can now be obtained.

[Example] Hereinafter, an example of the present invention will be specifically described based on FIGS. 1 to 6.

In the excavation equipment according to this embodiment, as shown in FIG.
1 are attached vertically at a required interval, and the power from the drive device 1 is transferred to a rotation transmission mechanism (not shown) such as a gear provided in the reducer 2. It is transmitted to each of these excavation shafts 10 via the excavation shafts 10, so that the adjacent excavation shafts 10 rotate in opposite directions.

Here, when installing the three excavation shafts 10 vertically on the reducer 2, the length of the excavation shaft 10 at the center is made slightly shorter than the excavation shafts 10 on both sides, and the tip of the central excavation shaft 10 is Installed drilling head 11
are located slightly above the excavation heads 11 attached to the tips of the excavation shafts 10 on both sides, so that the excavation heads 11 do not collide with each other when each excavation shaft 10 rotates.

In addition, these excavation shafts 10 vertically installed on the reducer 2
In this case, a stirring blade 12a and a screw blade 12b are provided at appropriate positions, and the excavated earth and sand are stirred by the stirring blade 12a and the screw blade 12b, and the soil is lifted up.

Each excavation shaft 10 vertically installed in this way is held by the steady rest 3 to suppress the swing of each excavation shaft 10, and also to prevent the swinging of each excavation shaft 10 from occurring at the upper end, lower end, and center of the excavation shaft 10. Connectors 20 extending in the direction in which these excavation shafts 10 are arranged are provided at each location,
Each excavation shaft 1 is
0 is rotatably held, and the respective excavation shafts 10 are connected at a required interval in the direction in which they are arranged, so that the interval in the direction in which the excavation shafts 10 are arranged does not change.

Here, in each of the above-mentioned connectors 20, the holding part 2 has a cylindrical shape corresponding to the interval between the excavation shafts 10.
1 are provided, and each holding portion 21 is configured to rotatably hold the excavation shaft 10.

In addition, in these connectors 20, in order to have the holding parts 21 hold the excavation shafts 10, the couplers 20 are divided into two vertically, and the semi-cylindrical holding parts 21 are combined to hold each excavation shaft 10. At the same time, in the attachment part 23 between the holding parts 21,
The two halves of the connecting tool 20 are connected by a connecting means 24 such as a bolt or a nut.

Here, in this embodiment, as shown in FIGS. 1 to 4, the excavation shaft 10 is held in a coupling 20 provided at the lower end of the excavation shaft 10 near the upper part of the excavation head 11. Holding part 2
Both sides of the attachment part 23 between 1 and this connector 2
Cutting blades 22 facing upward are rotatably attached to both ends of the blade 0 by rotary attachment means 25 such as hinges.

And each cutting blade 2 attached in this way
2 is provided with a stopper part 22a extending downward, and the cutting blade 22 is provided with a stopper part 22a extending downward.
is abutted against the connecting tool 20 to maintain each cutting blade 22 in a state of being inclined outward at a required angle.

Next, a case where excavation is performed using such an excavation device will be described.

When excavating with such an excavation device, first, the driving device 1 is driven, and the power is transmitted to each excavation shaft 10 via the reduction gear 2, so that the adjacent excavation shaft 10 The excavation shafts 10 are rotated in opposite directions.

The excavator is lowered while rotating each excavation shaft 10 in this way, and the ground is excavated by each excavation head 11 provided at the tip of each excavation shaft 10. Add improvers such as cement milk and mortar to the drilling head 1.
The improved agent and the excavated soil are stirred by the stirring blades 12a and screw blades 12b provided on the excavation head 11 and the excavation shaft 10, and the soil is lifted to a predetermined depth. dig. At this time, the excavated hole group 30 drilled by each excavation head 11 has unexcavated portions 32 on both sides of a portion 31a where the excavated holes 31 overlap each other, as in the conventional excavated hole group 30 shown in FIG. remains.

In addition, when excavating in this way, each excavation axis 1
0 is held by the steady rest 3 to suppress the swing, and the connecting tools 20 provided at two locations, the upper end, the lower end, and the center of each excavating shaft 10, allow each excavating shaft 10 to The spacing in the arrangement direction is kept constant.

In addition, each cutting blade 22 attached to a connector 20 provided at the lower end of these excavation shafts 10
The excavation head 11 is maintained in an upward position by the earth pressure when excavating the ground, and no resistance is applied when the excavation head 11 excavates the ground to a required depth.

In this way, the drilling hole group 3 as shown in FIG.
After drilling a hole 0, when this drilling equipment is pulled up with a winch or the like and each drilling shaft 10 is raised, each cutting blade 22 attached to a connector 20 provided at the lower end of these drilling shafts 10 , it falls outward due to the earth pressure of earth and sand above it, and is maintained in a state of being inclined outward at a required angle by the stopper portion 22a.

Here, in a state where each cutting blade 22 is inclined outward at a required angle in this way, each cutting blade 22 provided on both sides of the attachment part 23 between the holding parts 21 is The cutting blades 22 provided at both end portions of the connecting tool 20 are designed to protrude in correspondence with the trench remaining portions 32 in the drill hole group 30, and the cutting blades 22 provided at both end portions of the coupling tool 20 are further protruded from the side end portions of the drill hole group 30. It is designed to protrude laterally.

When the excavation equipment is pulled up with a winch or the like in this state, the cutting blades 2 provided on both sides of the attachment part 23 between the holding parts 21 are removed.
2 cuts the remaining trench portions 32 remaining on both sides of the portion 31a where the excavated holes 31 overlap,
Each of the cutting holes 22 provided at both ends of this connector 20 cuts a protrusion 33 that projects laterally from each of the drilling holes 31 drilled by the drilling heads 11 on both sides. Become.

As a result, as shown in FIG. 5, there is no remaining trench portion 32 on both sides of the overlapping portion of the drill holes 31, and a drill hole group 30 is formed that has protrusions 33 that protrude laterally from the drill holes 31 on both sides. be done.

In addition, when forming a long continuous drilling hole group 30 by repeatedly drilling such a drilling hole group 30, as shown in FIG.
0 flows toward the previously drilled hole group 30, a new drill hole group 30 is drilled at a position slightly away from the previous drill hole group 30, and when the drilling equipment is withdrawn. The cutting blade 22 provided at the side end of the connector 20 cuts the protrusions 33 that protrude laterally from the drilled holes 31 on both sides so that they are continuous with the previously drilled hole group 30.

[Structure of the Invention] As detailed above, in the excavation equipment according to the present invention, the plurality of excavation shafts vertically installed at a required interval are rotated by the holder of the connector provided in the direction in which the axes are arranged. At the same time, upwardly facing cutting blades are attached to both sides between the holding parts of this coupling device and to the side ends of this coupling device so that they can be tilted outward at a required angle, so that each excavation shaft can be held easily. After drilling to the required depth using the drilling head attached to the tip to form a group of drilled holes, the drilling equipment is hoisted up using a winch, etc., and each drilling shaft is raised. Each cutting blade is tilted outward at a required angle due to the earth pressure of the earth and sand above it, and as the excavation equipment rises, the cutting blades provided on both sides between the holding parts move toward each other in the excavation hole. At the same time, the cutting blades provided at the side ends of the coupling tool protrude and cut the parts on the sides so that they are continuous with the above-mentioned excavation hole group. It becomes like this.

As a result, when a plurality of drill hole groups are repeatedly formed using the drilling equipment of the present invention and a large number of continuous drill hole groups are drilled to construct an underground continuous wall, it is difficult to construct an underground continuous wall. , there is a hole left on both sides of the area where the drilled holes overlap, and the core material such as H type steel does not come to the position of the hole left part and becomes difficult to embed. It has become possible to easily embed the core material in any position, significantly improving work efficiency, and making it possible to freely change the pitch of the core material.

In addition, when forming a large number of consecutive drill hole groups, when drilling a new drill hole group so that it is continuous with a previously drilled drill hole group,
To prevent the drilling shafts from flowing toward the previous drilling hole group, each drilling shaft is held at a position a little distance from the previous drilling hole group by the holding part of the connector while drilling a new drilling hole group. At the time of salvage, the protruding part on the side of the new drill hole group is cut by the cutting blade provided at the side end of the coupling tool, and the new drill hole group is continuous with the previous drill hole group. Now I can make it work.

As a result, in the conventional method, at least one drilling shaft is inserted into at least one drilling hole of a previously drilled drilling hole group, and a new drilling hole group is formed while being guided by the other drilling shaft. Compared to the case of
A large number of continuous drilling holes can be drilled efficiently, and the work efficiency when constructing underground continuous walls has been significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of an excavation device according to an embodiment of the present invention, Fig. 2 is a partial front view of the same embodiment, and Fig. 3 is a plan view showing a state in which a cutting blade is attached to a coupling tool in the same embodiment. Fig. 4 is a partial sectional view showing the cutting state of the cutting blade attached to the coupling tool in the same embodiment, and Fig. 5 shows the state of a group of drilling holes drilled by the drilling equipment of the same embodiment. FIG. 6 is a plan view showing a state in which a group of drilling holes are continuously drilled by the drilling rig of the same embodiment, and FIG. It is a top view which shows the state of a hole group. 10...Drilling shaft, 11...Drilling head, 20...
...Connector, 21... Holding part, 22... Cutting blade.

Claims (1)

[Claims] 1. In an excavation device in which a plurality of excavation shafts 10 each having an excavation head 11 attached to the tip thereof are vertically installed at a required interval, the holding portion 21 of the connector 20 provided in the direction in which these excavation shafts 10 are arranged is Therefore, each excavation shaft 10 is rotatably held at a required interval, and both sides of the connector 20 between the holding parts 21 holding the excavation shaft 10 and the side ends of the connector 20 are An excavation device characterized in that the cutting blades 22, each facing upward, are attached so as to be tiltable outward at a predetermined angle.