JPS5910443B2 - Underground wall construction method and underground excavation equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention provides an underground wall construction method for forming an underground wall in a circular, rectangular, etc. shape by continuously erecting steel pipe sheet piles underground, and a method for implementing this method. Regarding underground drilling equipment.

In the conventional underground wall construction method, a hole with an inner diameter that is wider than the outer diameter of the steel pipe is drilled in advance, and a steel pipe with a guide member that extends around the circumference is erected. Insert it eccentrically to the center of the hole.

Next, using a drilling device that has a connecting member that can engage with the guide member, a hole for construction that is thicker than the diameter of the steel pipe is excavated while being guided by the guide member for the steel pipe, and the steel pipe is inserted while being guided by the guide member. In particular, this method involves continuously connecting steel pipe sheet piles to form an underground wall.

However, with this conventional underground wall construction method, the amount of excavation required to insert the steel pipe is greater than the amount originally required, and the portion with a margin for the construction hole does not come into contact with the steel pipe.
It has the disadvantage that it is unstable and the inner wall of the construction hole may collapse.

In addition, in the conventional underground wall construction method, first, multiple small-diameter joint holes are drilled at regular intervals, and then a construction hole that partially overlaps and communicates with the first joint hole is drilled. ,
The steel pipe sheet pile with the first guide member is inserted so that the main body is housed in the erection hole and the guide member is housed in the joint hole.

Next, an excavator having a connecting member that can be engaged with the guide member is guided by the guide member of the first steel pipe sheet pile, and a second joint hole that partially overlaps and communicates with the first and second joint holes is guided by the guide member of the first steel pipe sheet pile. A construction hole is excavated, and the second steel pipe sheet pile is guided by the connecting member to the guide member of the first steel pipe sheet pile and inserted into the second construction hole.

Hereinafter, a similar method will be used to connect steel pipe sheet piles to form an underground wall.

However, in this second conventional underground wall construction method, the drilling of the joint hole and the drilling of the erection hole are divided into two stages, so the underground wall is not formed in a straight line. It also has the disadvantage of poor workability.

The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art.The purpose of the present invention is to efficiently excavate a construction hole that matches the outer diameter of a steel pipe, and to efficiently drill a construction hole that matches the outer diameter of a steel pipe, and to An object of the present invention is to provide an intermediate wall construction method and an underground excavation device.

In order to achieve the above object, one aspect of the present invention is to provide a drive source that is separate and independent from the drive source of a main drill bit for drilling a hole for steel pipe erection, and that is connected to the hole for steel pipe erection. Using an underground drilling device, a sub-drill bit for drilling partially overlapping and communicating joint holes can be removably attached to the side of the underground drilling device.
A steel pipe installation hole and a joint hole that partially overlaps and communicates with the hole are simultaneously excavated, and then steel pipe sheet piles are installed in the steel pipe installation hole and the joint hole.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of an underground wall construction method and an underground excavation apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

First, an embodiment of an underground excavation device for implementing the underground wall construction method according to the present invention will be described.

As shown in FIG. 1, a pair of motors 2A serving as a driving source are installed in a casing 1 constituting the main body of the underground excavation equipment.

2B is installed.

The motors 2A and 2B are connected to the center shaft 3 by a gear mechanism (not shown) inside the casing 1, and rotate a reverse drill bit 30 at the tip of the center shaft 3.

Furthermore, the center shaft 3 is connected to a pair of large diameter main drill bits 4A via a gear mechanism which will be described later.

It is designed to give one rotation force to 4B.

The main drill bits 4A and 4B are used to drill holes for installing steel pipes, and by rotating them in opposite directions, the reaction torques generated in the main drill bits 4A and 4B are canceled out.

In Fig. 1, only a pair of main drill bits) 4A and 4B are shown, but the invention is not limited to this, and as long as the main drill bits are composed of an even number, the rotation of the opposing drill bits is By making the directions opposite to each other, it is possible to cancel out the reaction torque occurring in the main drill bit.

A small diameter sub-drill pit) 5A is installed on the side of casing 1.
, 5B is installed, and this sub-drill pit) 5
A and 5B each have a motor 6A as a dedicated rotational drive source.
, 6B will be installed.

The sub drill bits 5A, 5B and the motors 6A, 6B are the bit units 10A, 10B with #1. These bit units) IOA and IOB are detachably attached to the side of the casing 1 by screw fastening means or the like.

As described later, bit units 10A and 10B
can be removed and a connecting member described later can be attached.

In this way, since the bit units 10A and 10B are constructed separately from the casing 1, there is no risk of mud or the like entering the gear transmission mechanism inside the casing 1 when they are attached or detached.

In addition, the main drill bits 4A, 4B and the sub drill bits 5A, 5B are used so that when drilling, the steel pipe installation hole and the joint hole partially overlap and communicate with each other, as shown in Fig. 1. Deploy.

Further, as shown in FIG. 2, a guide 7 is fixed to the side surface of the casing 1 to make contact with the steel pipe installation hole to maintain the vertical accuracy of the steel pipe installation hole during excavation.

3 and 4 show a gear transmission mechanism 8 for providing rotational drive from the center shaft 3 to the main drill bits 4A, 4B, and a gear transmission mechanism 8 for drilling the main drill bits 4A, 4B. It shows a structure for changing the distance between the shafts according to the change in the hole diameter.

A gear transmission mechanism 8 for transmitting the rotational force from the center shaft 3 to the main drill pin 4A on the upper left side of Fig. 3 is composed of two gears 8A and 8B as idlers. Apply a rotational force in the counterclockwise direction on the top of Figure 3.

On the other hand, the gear transmission mechanism 8 for applying rotational force to the main drill bit 4B on the upper right side of FIG. Gives rotational force in the direction.

Since the rotation directions of the main drill bits 4A and 4B are opposite to each other, the main drill bits 4A and 4B are
The respective counterclockwise torques generated at B cancel each other out.

In addition, in order to change the distance between the axes of the main drill bits 4A and 4B in accordance with the change in drilling hole diameter, first the blocks 11A, 11B, 1
Remove 2A and 12B to shorten the distance between the shafts.

Next, move the gear 8A to the position shown in FIG.
Instead, it is possible to use a small-diameter gear 8D and change the distance between the axes of the main drill bits 4A and 4B.

An embodiment of the underground wall construction method according to the present invention will be carried out as follows using the embodiment of the underground excavation apparatus according to the present invention configured as described above.

First, the underground excavation equipment shown in FIG. 1 was used.

As shown in FIG. 5, the first steel pipe installation holes 41A, 4
1B and joint hole 31.51A.

Excavate 51B.

In this case, the steel pipe erection holes 41A and 41B are drilled with main drill bits 4A and 4B, the joint hole 31 is drilled with reverse drill bit 30, and the joint holes 51A and 51B are drilled with sub drill bits 5A and 5B, respectively.

Note that the bit units IOA and 10B can be installed at any position on the side of the casing 1 as described above, so as shown in FIG. Can be installed and excavated.

It is not possible to install the sub drill bit 5B in an eccentric position off the center line.

In particular, it is necessary to form a corner part of an underground wall. 1 To form an underground wall on a normal straight line, as shown in Figs. Attach bits 5A and 5B and excavate.

Next, the first steel pipe sheet pile 100A is inserted into the first steel pipe erection holes 41A, 41B and the joint holes 31, 51A, 51B.
, 100B are inserted into the steel pipe sheet piles 100A and 100B,
As shown in FIG. 5, the connecting member 110 of the male joint and the corresponding guide member 111 of the female joint extend in the axial direction on their peripheral surfaces.
Insert 0A into erection hole 41A, and first insert 100 steel pipe sheet piles.
The connecting member 110 of B is engaged with and guided by the guide member 111 of the steel pipe sheet pile 100A that has already been inserted, and the connecting member 110 of B is guided through the erection hole 41B.
Insert into.

Next, one bit unit 10A of the underground excavation equipment shown in FIG. 1 is removed, and as shown in FIGS. 5 and 6, the guide member 1 extending on the circumferential surface of the steel pipe sheet pile 100B is removed.
A connecting member 120 of a male joint that can be engaged with 11 is attached.

Then, using this underground excavation device, the connecting member 120 of the underground excavation device is engaged with the guide member 111 of the steel pipe sheet pile 100B, and the second steel pipe erection holes 42A, 42B and joint hole 32.52B are excavated. .

In this case, since the underground excavation device excavates while being guided by the guide member 111 of the steel pipe sheet pile 100B, the vertical precision of the construction holes 42A, 42B and the joint hole 32.52B can be maintained.

Next, a second steel pipe sheet pile (not shown) is inserted into the second erection holes 42A, 42B and the joint hole 32° 52B.

Then, the inserted second steel pipe sheet pile guide member guides the underground excavation equipment to excavate a third steel pipe erection hole and a joint hole, and insert the third steel pipe sheet pile.

Thereafter, the steel pipe sheet piles are connected in the same manner to form an underground wall.

In FIGS. 7 and 8, a so-called unrestrained revolving drilling device 9 includes sub-drill pits) 5A, 5B and motors 6A, 6B.
A bit unit 10A consisting of.

10B is another embodiment of the underground excavation equipment according to the present invention, in which the 10B is detachably attached.

The unrestrained revolving drilling equipment 9 has a transfer device connected to a motor mounted on the main body of the drilling equipment, a revolving casing is rotatably attached to the main body, and a plurality of main drill bits 91 are mechanically attached to the revolving casing. The main drill bit 91 is arranged so as to maintain a balanced position, and the main drill bit 91 is rotated from the transmission device through a transmission member that rotates coaxially with the revolving casing, and the revolving casing is interlocked with the transmission device to rotate the main drill bit 91. The casing is caused to revolve by reaction in a direction opposite to the direction of rotation, and the transmission torque of the transmission member and the braking torque of the revolving casing are made substantially equal (Japanese Patent Publication No. 51-1720
(See No. 1).

In this second embodiment, unlike the embodiment shown in FIG. 1, the holes for installing steel pipes are drilled one by one.
The joint hole is drilled at the same time as the steel pipe installation hole, similar to the embodiment shown in FIG.

Further, the inner diameter of the steel pipe installation hole is sized to match the steel pipe outer diameter, and the vertical accuracy between the steel pipe installation hole and the joint hole can be maintained.

As explained above, according to the underground wall construction method and underground excavation device according to the present invention, it is possible to simultaneously excavate the erection hole and the joint hole that match the steel pipe diameter.
Unlike the conventional example, the vertical accuracy of the installed steel pipe is not disturbed and the inner wall of the pile hole does not collapse.

Furthermore, since the steel pipe installation hole and the joint hole are excavated at the same time, there are advantages in that the accuracy of the straightness of the underground wall is improved and the workability is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of an underground excavation device according to the present invention;
FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. Figure 3 is a sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a cross-sectional view of the
In the embodiment of the underground drilling equipment shown in the figure, a sectional view corresponding to FIG. 3 for explaining the case where the distance between the axes of the main drill bit is changed, and FIG. FIG. 6 is a cross-sectional view for explaining an embodiment, FIG. 6 is a front view for explaining an embodiment of the underground wall construction method according to the present invention, and FIG. 7 is a diagram showing another underground excavation apparatus according to the present invention. The front view of the embodiment, FIG. 8, is a sectional view taken along the line ■-■ in FIG. 7. 2A, 2B...Motor % 4A, 4B...Main drill bit, 5A, 5B...Sub drill bit,
6A. 6B...Motor, 8...Gear transmission mechanism, 10A, I
OB...bit unit, 41A, 41B...first
Holes for installing steel pipes, 42A, 42B...Second holes for installing steel pipes, 51A, 51B...Joint holes, 100
A. 100B... First steel pipe sheet pile, 110... Connection member for steel pipe sheet pile, 111... Guide member for steel pipe sheet pile, 120
...Connecting member attached to underground excavation equipment.

Claims (1)

[Scope of Claims] 1. In an underground wall construction method in which steel pipe sheet piles are continuously erected underground, one or more steel pipe erecting holes and one or more holes that partially overlap and communicate with the steel pipe erecting holes. First, the steel pipe sheet piles are drilled into the steel pipe installation holes and joint holes, and the next steel pipe installation holes and joint holes are drilled using the installed steel pipe sheet piles as guide members. An underground wall construction method characterized by: An underground drilling equipment having a main drill bit for drilling 21 or more holes for steel pipe installation, which is equipped with an independent drive source that is separate from the drive source for the main drill bit, and is connected to the hole for installing steel pipes. A sub-drill bit for drilling partially overlapping and communicating joint holes is removably attached to any position on the side of the underground drilling equipment body, and a connecting member with the steel pipe sheet pile is attached to the side of the underground drilling equipment body. An underground excavation device characterized in that it can be installed.