JP2812888B2 - Connection pin for connecting rod for ground improvement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting rod for a ground improvement method. More specifically, connecting a connecting rod for a ground improvement method in which a subsequent connecting rod is added when the leading rod is advanced to a deep portion of a drilling hole while a ground improving agent or the like is passed through and sprayed from the leading part. The connection pin used for the connection.

[0002]

2. Description of the Related Art Various holes are formed in the ground. Holes are also drilled for ground improvement. Multiple pipes are inserted into the borehole. The head of the multiple tube forms a rotating stirring shaft. The stirring shaft injects a ground improvement agent such as cement milk from an injection hole at the tip. The ground is improved by stirring and mixing the ground constituent and the ground improving agent while stirring the ground constituent using the injection pressure.

As the depth increases, the multiple tubes are pushed. To push forward, add multiple tube rods. The addition of the multiple pipe rods is performed by connecting the front and rear pipes. Thread connections are commonly used as a means of connection. In this case, the rotation direction of the pipe and the rotation direction of the screw tightening are considered.

[0004] A gap is provided between the peripheral surface of the pipe and the borehole. When the pipe peripheral surface is a cylindrical surface, the gap between the peripheral surface of the pipe and the excavation hole tends to be narrow in design. Therefore,
In order to widen the gap, a polygonal tube is used.

[0005]

There is a need for a secure connection of the front and rear tubes when not using a threaded connection. A packing is often provided between the front and rear connections. There is a need for a solid fastening structure connection, including packing fastening.

The present invention has been made based on such a technical background, and achieves the following objects.

[0007]

[0008]

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connecting pin for a connecting rod for a ground improvement method in consideration of an appropriate shape of a connecting and tightening pin for securely tightening the front and rear pipes.

[0011]

Means for Solving the Problems To solve the above-mentioned problems, the following means are adopted.

The connecting pins of the connecting rod for ground improvement method of the present invention are provided at a tubular front rod (1), a tubular rear rod (2), and a rear end of the front rod (1). And a tubular front rod tail end side coupling portion (5) provided with a second coupling peripheral surface (6), and a third coupling peripheral surface (8) provided at the front end of the rear rod (2). And a second connecting pin hole (31) opened in the second coupling peripheral surface (6) and opened in a direction crossing the rod axis. ) And a third connecting pin hole (32) opened on the third coupling peripheral surface (8) and intersecting the rod axis, for connecting a connecting rod for ground improvement method. A connection pin to be used, wherein said second connection pin hole (31) Is inserted into the synthetic hole with a gradient plane intersecting the rod axis is formed out with the third connection pin hole (32) (44) (35), a part-cylindrical outer peripheral surface,
An intersection plane (5) intersecting the rod axis in a non-orthogonal direction
2) and a parallel plane (51) parallel to a direction perpendicular to the rod axis.

[0013]

[0014]

[0015]

[0016]

[0017]

The connecting rod for the ground improvement method of the present invention comprises a connecting pin having a sloping surface in a connecting hole having a sloping surface positioned on each of the front and rear coupling peripheral surfaces provided on the front and rear rods (tubes). Insert. The slope surface intersects the rod axis in a non-perpendicular direction. By inserting the connecting pins, the front and rear pipes are securely connected by the wedge effect, and at the same time, the front and rear pipes are properly tightened. In this way, subsequent tubes are connected one after another.

By this tightening, the packing interposed between the front and rear pipes is properly tightened.

The connecting rod is securely tightened by a parallel surface parallel to a line perpendicular to the rod axis and a cross surface intersecting the rod axis in a non-perpendicular direction.

[0020]

Next, an embodiment of the present invention will be described. FIG. 1 is a front cross-sectional view showing Embodiment 1 of the present invention, and shows in detail a connection relationship between front and rear rods. FIG. 2 shows an entire single rod. The tubular rear rod 2 is connected to the tubular front rod 1. The front rod 1 and the rear rod 2 have exactly the same configuration.

However, the most advanced rod (not shown) is partially different from the subsequent rods 1 and 2. For example, state-of-the-art rods have drilling bits, nozzle mechanisms for ejecting ground improvement agents such as high-pressure fluid cement milk,
Equipped with stirring blades.

The front end of the front rod 1 forms a tubular front rod head end side coupling part 3. The outer peripheral surface of the front rod head end side coupling portion 3 forms a first coupling peripheral surface 4. In this embodiment, the first coupling peripheral surface 4 has an outer peripheral surface. As shown in FIGS. 3, 4, 5, and 6, the cross section of the first coupling peripheral surface 4 is polygonal and hexagonal.

The rear end of the front rod 1 forms a tubular front rod tail end coupling portion 5. The inner peripheral surface of the front rod tail end side coupling portion 5 is shown in FIGS.
As shown in the figure, the second coupling peripheral surface 6 is formed. As shown in FIGS. 3 and 10, the second coupling peripheral surface 6 has a polygonal cross section and a hexagonal shape.

The front end of the rear rod 2 forms a tubular rear rod head end coupling part 7. The outer peripheral surface of the rear rod head end side coupling portion 7 forms a third coupling peripheral surface 8. Third coupling peripheral surface 8
Has an outer peripheral surface. The third coupling peripheral surface 8 has a polygonal cross section as shown in FIGS.
It has a square shape. The rear end of the rear rod 2 forms a tubular rear rod tail end coupling portion 9.

The inner peripheral surface of the rear rod tail end side coupling 9 forms a fourth coupling peripheral surface 10 as shown in FIGS. As shown in FIGS. 3 and 10, the fourth coupling peripheral surface 10 has a polygonal shape and a hexagonal shape. As shown in FIG. 1, the second coupling peripheral surface 6 of the front rod tail end side coupling part 5 and the third coupling peripheral surface 8 of the rear rod head end coupling part 7
The faces are in contact. The outer peripheral surfaces of the front rod tail end side coupling portion 5 and the rear rod tail end side coupling 9 have a substantially square shape as shown in FIGS. The outer peripheral surfaces of the large diameter portions of the front rod head end side coupling part 3 and the rear rod head end side coupling part 7 are substantially square as shown in FIGS.

As shown in FIG. 2, the front rod head end side coupling portion 3 and the front rod tail end side coupling portion 5 are connected by an outer casing 11. The cylindrical inner peripheral surface 12 of the front rod head end side coupling part 3 and the cylindrical inner peripheral surface 1 of the front rod tail end coupling part 5
3, a single cylindrical inner casing 14 is joined. Two annular vibration-proof packings 18 and 19 are provided in an annular space between the outer casing 11 and the inner casing 14. The vibration-proof packings 18 and 19 are provided with packing seats 16 attached to the inner casing 14.
25.

As shown in FIG. 1, the rear rod head end side coupling portion 7 and the rear rod tail end coupling 9 are connected by an outer casing 20. A single cylindrical inner casing 23 is joined to the cylindrical inner peripheral surface 21 of the rear rod head end coupling 7 and the cylindrical inner peripheral surface 22 of the rear rod tail end coupling 9.
Two annular anti-vibration packings 27 and 28 are provided in an annular space between the outer casing 20 and the inner casing 23. The vibration-proof packings 27 and 28 are provided with packing seats 26 and 29 attached to the inner casing 23.
It is supported by.

A first connection pin hole 30 opened in the first coupling peripheral surface 4 and opened in a direction crossing the rod axis.
2, 4, and 5, are provided on the front rod head end side coupling portion 3. As shown in FIGS. As shown in FIGS. 2 and 8, a second connection pin hole 31 opened in the second coupling peripheral surface 6 and opened in a direction intersecting the rod axis is provided with a front rod tail end side coupling portion 5. It is provided in.

A third connection pin hole 32 opened to the third coupling peripheral surface 8 and opened in a direction crossing the rod axis.
Is provided on the rear rod head end side coupling portion 7 (see FIG. 4). A fourth connection pin hole 33 opened in the fourth coupling peripheral surface 10 and opened in a direction crossing the rod axis is provided in the rear rod tail end side coupling 9.

As shown in FIG. 1, the second connection pin hole 31 of the front rod tail end coupling portion 5 and the third connection pin hole 32 of the rear rod head end coupling portion 7 are combined. A hole 35 is formed. As will be described later, the synthetic hole 35 has a slope that intersects the rod axis in a non-orthogonal direction. The synthetic holes 35 are provided at two different positions in the axial direction of the rod and in the circumferential direction of the rod.

As shown in FIG. 1, the rear partial end face 37 of the front rod 1 and the front partial end face 3 of the rear rod 2
A packing 40 for preventing leakage of the chemical solution is provided between the gasket 8 and the gasket 8. The packing 40 includes a second coupling peripheral surface 6 of the front rod tail end side coupling portion 5 and a third coupling peripheral surface 8 of the rear rod head end coupling portion 7.
It is provided in order to prevent intrusion of the chemical solution between the two. The chemical solution is, for example, a ground improving agent, such as cement milk.

As shown in FIGS. 8 and 9, the synthetic hole 35 has a partial cylindrical surface 41 formed in the front rod tail end side coupling portion 5 in a direction perpendicular to the axis. As shown in FIGS. 4, 5, and 6, the synthetic hole 35 includes a slot 42 having a quadrangular cross section formed in the rear-side rod head end side coupling portion 7 in a direction substantially perpendicular to the axis. Two slots 42 are provided at two different positions in the axial direction and the circumferential direction. Slot 42
As shown in FIG. 5, has a perpendicular surface 43 intersecting in a direction perpendicular to the rod axis and a slope surface 44 intersecting in a direction not perpendicular to the rod axis. The slope surface 44 is on the front side with respect to the orthogonal surface 43.

FIGS. 13, 14, 15 and 16 show a composite hole 35.
1 shows a front-side connection pin 50 inserted into the connector. The connection pin 50 has a cylindrical surface 50 a in contact with the inner peripheral surface of the second connection pin hole 31 and the rear rod head end side coupling portion 7.
The flat surface 51 and the slot 4 that are in contact with the third coupling peripheral surface 8
There is provided a slope surface 52 that meshes with the second slope surface 44. The plane 51 and the slope surface 52 have a crossing line 53 crossing at right angles to each other. The cross line 53 overlaps with a cross line where the slope surface 44 and the third coupling peripheral surface 8 cross.

FIGS. 17, 18, 19, and 20 show a rear connection pin 50 inserted into the other synthetic hole 35. FIG. The connecting pin 50 has a groove with a cylindrical surface 50 that is in contact with the inner peripheral surface of the second connecting pin hole 31 and a planar surface 51 that is in contact with the third coupling peripheral surface 8 of the rear rod head end side coupling portion 7. A slope surface 52 that meshes with the slope surface 44 of the hole 42 is provided. The plane 51 and the slope surface 52 have a crossing line 53 crossing at right angles to each other.

The crossing line 53 overlaps a crossing line at which the slope surface 44 and the third coupling peripheral surface 8 cross. The two connecting pins 50 are provided in two synthetic holes 35, 3 from the left and right sides.
5 is inserted. That is, the two connection pins 50, 50 inserted into the two synthetic holes from the left and right sides are mirror image inversion symmetric.

FIG. 9 shows round holes 55 and 56 formed coaxially with the composite hole 35 on the left and right of the composite hole 35 composed of the second connection pin hole 31 and the third connection pin hole 32. I have. The round hole 55 has a smaller diameter than the second connection pin hole 31 and
A screw 57 is cut in the portion. The round hole 56 has substantially the same diameter as the second connection pin hole 31 and has a female screw 58 cut entirely. As shown in FIG. 3, from the left and right of the connection pin 50,
A set bolt 59 is screwed into the screw 57 and
Bolts 60, 61 for tightening the body are screwed.

FIG. 12 shows the locations where quenching is performed on the coupling peripheral surfaces 6 and 10 of the couplings 5 and 9 by chain lines.

Next, the operation and usage of the first embodiment will be described. The head rod not shown is different from the rod shown in FIG. A nozzle for jetting a ground improving agent, a stirring blade, and the like are attached to the leading rod. The rod shown in FIG. 1 is connected to the rear end of the leading rod. For example, the rear part of the front rod is provided with a front rod tail end side coupling part 5 shown in FIG.

A rear rod head that forms the front end of the rear rod 2 on the hexagonal second coupling peripheral surface 6 of the front rod tail end coupling part 5 that forms the rear end of the front rod 1 The rear rod 2 is inserted into the front rod 1 along the third coupling peripheral surface 8 of the end coupling part 7. By this insertion, the composite hole 35 is composed of the second connection pin hole 31 and the third connection pin hole 32 at two places. One connecting pin 50 is provided in one of the two synthetic holes 35.
From the right (or left).

The front end of the connection pin 50 abuts on the bolt 59 as shown in FIG. Double bolt 6 from right
0, 61 are screwed into the female screw 58. By such screwing, the partial cylindrical surface of the connecting pin 50 is guided to the partial cylindrical surface 41 of the synthetic hole 35. Flat surface 51 of connection pin 50
Are guided to the plane of the composite hole 35.

Similarly, the rear connecting pin 50 is inserted into the rear composite hole 35. Sliding between the inclined surface 52 of the connecting pin 50 and the inclined surface 44 of the slot 42 generates a forward-direction tightening force of the front rod 1 with respect to the rear rod 2. This tightening force becomes a bonding force between the front rod 1 and the rear rod 2, and a tightening force of the packing 40 between the front rod 1 and the rear rod 2.

The rearmost rod of the connecting rods connected in this way is gripped and rotated by a commonly used rotary driving machine, and high-pressure cement milk is introduced into the inner casing 14 via a swivel. The liquid and the crushed stone blasted from the leading rod are collected on the ground through a gap between the cylindrical drilling hole and the rectangular outer casing 11.

The high-pressure chemical in the inner casing 14 is prevented from leaking by the tightly packed gasket 40,
There is no leakage between the first coupling peripheral surface 4 and the fourth coupling peripheral surface 10. If the leakage occurs, the attaching and detaching work of the front rod 1 and the rear rod 2 does not work well, causing play and loss of connection integrity after connection.

When the connection is released after the completion of the construction, the bolt 59,
The tightening bolts 60 and 61 are removed, and the connecting pin 50 is pulled out of the synthetic hole 35 by means such as a hammer.

[0045]

[Other Embodiments] The embodiment of the connecting rod for ground improvement method of the present invention is not limited to the above embodiment. For example, the front rod head end side coupling part 3 constituting the front end / rear part of the rod is male / female, but can be inverted. Also, the first connection pin hole 30 formed on the outer peripheral surface is formed.
Can be formed on the inner peripheral surface, and a gradient surface can be provided there.

[0046]

According to the connecting rod for ground improvement method of the present invention, in addition to achieving the object of the present invention, the coaxiality of the front and rear rods at the time of connection is high, and the runout of the entire connecting rod can be prevented. As a result, there is little wear on the joint surface,
In addition, it is possible to further prevent runout.

[Brief description of the drawings]

FIG. 1 is an enlarged front sectional view showing a connecting portion of a connecting rod for ground improvement method according to a first embodiment of the present invention when connecting front and rear rods.

FIG. 2 is a front sectional view showing a single rod of Embodiment 1 of the connecting rod for ground improvement method of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a front sectional view showing a front rod head end coupling section 3 and a rear rod head end coupling section 7;

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a left side view of FIG. 4;

FIG. 7 is a right side view of FIG. 4;

FIG. 8 is a front sectional view of a front rod tail end coupling section 5 and a rear rod tail end coupling 9;

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

FIG. 10 is a right side view of FIG. 8;

FIG. 11 is a left side view of FIG. 8;

FIG. 12 is a front sectional view showing a quenching part.

FIG. 13 is a plan view showing a right connection pin.

FIG. 14 is a front view of FIG. 13;

FIG. 15 is a left side view of FIG. 14;

FIG. 16 is an oblique-axis projection view of FIG. 14;

FIG. 17 is a plan view showing a left connection pin.

FIG. 18 is a front view of FIG. 17;

FIG. 19 is a right side view of FIG. 17;

FIG. 20 is an oblique-axis projection view of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Front rod 2 ... Rear rod 3 ... Front rod head end side coupling part 4 ... First coupling peripheral surface 5 ... Front rod tail end side coupling part 6 ... Second coupling peripheral surface 7 ... Rear rod head end side coupling part 8 ... third coupling peripheral surface 9 ... rear rod tail end side coupling 10 ... fourth coupling peripheral surface 11 ... outer casing 14 ... inner casing 30 ... first connection pin Hole 31: Second connection pin hole 32: Third connection pin hole 33: Fourth connection pin hole 35: Synthetic hole 40: Packing 41: Partial cylindrical surface 42: Slot hole 43: Orthogonal surface 44, 53 Surface 50: Connection pin 52: Flat surface

Claims (1)

(57) [Claims] 1. A tubular front rod (1), a tubular rear rod (2), and a second coupling peripheral surface (6) provided at a rear end of the front rod (1). A tubular rear rod head end coupling comprising a tubular front rod tail end side coupling part (5), and a third coupling peripheral surface (8) provided at the front end of the rear rod (2). Part (7), a second connection pin hole (31) opened in the second coupling peripheral surface (6) and opened in a direction crossing the rod axis.
And a third connecting pin hole (32) opened in the third coupling peripheral surface (8) and intersecting the rod axis.
A connection pin used for connecting a connection rod for a ground improvement method, comprising: the second connection pin hole (31) and the third connection pin hole (32). An intersecting plane (5) inserted into a synthetic hole (35) having a slope surface (44) intersecting with the center and intersecting the partial cylindrical outer peripheral surface in a direction orthogonal to the rod axis.
2) and a connecting pin for a connecting rod for a ground improvement method, comprising a parallel plane (51) parallel to a direction orthogonal to the rod axis.