JP3044084U - Joint structure of ground improvement rod body - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a joint structure for a ground improvement rod body, which has mechanical strength, reliable transmission of rotational torque, sealability,
Provide a structure that realizes workability and low cost. A joint structure between rod units in a ground improvement rod body, wherein end faces divided into a plurality at an end 32 of a first rod unit and adjacent end faces are in the rod body axial direction. A first claw portion having a convex surface and a concave surface formed at different positions; a second claw portion having a concave surface and a convex surface corresponding to the first claw portion at the end 34 of the second rod unit; And the second
The sealing piece 42 is inserted into the end of the rod unit via the O-ring, and the connecting means for connecting and fixing the first and second rod units.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a long rod body that is inserted into the ground for excavation or injection of ground improvement material in a ground improvement device, and more particularly to a joint structure of rod bodies.

[0002]

[Prior art]

 FIG. 4 is a diagram schematically showing a general ground improvement device 10 and a ground improvement body construction process using the same. The ground improvement device 10 includes a rod body 12 and a control unit 22 that drives and controls rotation and vertical movement of the rod body 12. The rod body 12 has a pipe structure such as a single pipe or a multiple pipe for transferring the ground improvement material, water, air or the like. These pipes contained in the rod body 12 are connected to a supply pipe 20 of various materials via a swivel 18 provided at the upper end of the rod body 12. An opening for discharging or ejecting the ground improvement material is provided near the tip of the rod body 12. In the ground improvement body construction process, for example, after drilling the target ground 60, the rod body 12 is inserted into the drilling hole, and the rod body 12 is rotated while being raised to form a cylindrical ground improvement body 50. . A stirring blade 16 is provided near the tip of the rod body 12 in FIG. 4 so as to project, and these stirring blades 16 rotate with the rotation of the rod body 12 to efficiently stir the ground improvement material and the ground. Thus, the ground improvement body 50 is created.

The rod body 12 is usually a long rod-shaped body as shown in the figure, and its length needs to be appropriately changed according to the construction situation. Usually, a rod body 13 having a desired length is assembled by connecting a necessary number of rod units 13 having a manageable length through a joint portion 14.

Since the entire rod body 12 integrally rotates in the forward and reverse directions and also moves up and down, each joint portion 14 has sufficient mechanical strength and a rotating torque. It is required to have a structure that ensures communication. Since a general screw connection cannot perform reverse rotation, a special joint structure has been used in the past.

FIG. 5A is a sectional view taken along the rod body axis showing an example of a joint structure in a conventional rod body 112. In the conventional joint structure, when the two rod units 13a and 13b are connected, the receiving side joint portion 134 provided at the end of the rod unit 13a and the insertion side joint provided at the end of the rod unit 13b. It is performed by fitting the portion 132. The joint position as seen from the outside is indicated by reference numeral 114. Each of the rod units 13a and 13b has a tube hole 142 for transferring a hardening material or the like, and the tube hole 142 penetrates the entire rod body. The insertion side joint portion 134 has an insertion portion having a hexagonal cross section, while the reception side joint portion 134 has an insertion hole having a corresponding hexagonal cross section. When the two ends are fitted in place, joint pin holes 136a, 136b are formed. As shown in the DD sectional view of FIG. 5B, the joint pin holes 136a and 136b are provided so as to penetrate the pipe wall in a direction perpendicular to the rod body axis. After passing a joint pin (not shown) through these joint pin holes 136a, 136b, the joint pins are fixed by screws using screw holes 138a, 138b provided with taps for fixing screws. As a result, the two rod units are connected and fixed, and it is ensured that rotational torque is transmitted between them. The sealing property is maintained by the O-ring 140 provided on the outer periphery of the insertion side joint portion 132 near the tip thereof. In another example, the cross section may be rectangular, but the other structures are common.

[0006]

[Problems to be solved by the device]

 However, in the above conventional joint structure, since the joint portions of both rod units have a polygonal cross section and are relatively long, a certain dimensional allowance is required in design in order to fit them smoothly. I had to hold it. As a result, there was rattling in the joint after assembly, and the sealability was poor, which could cause leakage. Also, since the insertion length is relatively long, it was necessary to carefully remove it so as not to damage the joint.

Further, since the joint portion having a hexagonal or quadrangular polygonal cross section is precisely processed, the manufacturing cost is high and the repair cost is also high.

Further, as shown in FIG. 5, in the conventional structure, since the position of the joint pin hole that horizontally penetrates the joint portion is determined, the connection angle of both rod units is limited to one. Therefore, it was necessary to be careful to insert it at the correct angle position.

In view of the above problems, an object of the present invention is to provide a joint structure of a rod unit in a rod body of a ground improvement device, which has mechanical strength and reliably transmits a rotating torque. That is.

A further object of the present invention is to provide a structure having a perfect sealing property for preventing leakage of a hardening material in a joint structure of a rod unit.

A further object of the present invention is to provide a joint structure in which the rod unit can be easily attached and detached.

A further object of the present invention is to reduce the manufacturing cost of the joint structure of the rod unit.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, one aspect of the joint structure between the rod units in the ground improvement rod body according to the present invention is that the entire circumference around the rod body axis is divided into a plurality at the end of the first rod unit. A first claw portion having a convex surface and a concave surface so that adjacent end surfaces are at different positions in the axial direction of the rod body, and the first rod portion at the end of the second rod unit. A second claw portion having a concave surface and a convex surface corresponding to the convex surface and the concave surface forming the first claw portion of the rod unit, and the rod body axis at the ends of the first and second rod units. A cylindrical sealing piece that is inserted through an O-ring into each of the cylindrical concave holes that are coaxially provided, and the sealing piece that is inserted in the state where the sealing piece is inserted through the O-ring. Having a rod unit and the second rod unit and coupling means you consolidated fixed.

Another aspect of the joint structure between the rod units in the ground improvement rod body according to the present invention is to equidistant from the rod body axis at each end of the first rod unit and the second rod unit. At the ends of the first and second rod units, a plurality of columnar joint pins are inserted into a space formed by a plurality of columnar recessed holes provided at positions that equally divide the entire circumference. A cylindrical sealing piece to be inserted through an O-ring into a cylindrical concave hole provided coaxially with the rod body axis, and a state in which the plurality of joint pins and the sealing piece are inserted. Connecting means for connecting and fixing the first rod unit and the second rod unit.

[0015]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an example thereof, and FIG. 1 (A) is a schematic sectional view of a joint portion between two rod units 13a and 13b. A joint portion 32 for connecting to an adjacent rod unit is provided at the end of the rod unit 13a. Similarly, the rod unit 13b is also provided with a joint portion 34 at its end. The respective end surfaces of the joint portion 32 and the joint portion 34 are not a uniform plane, but have a plurality of end surfaces at different positions in the axial direction of the rod body. Therefore, the joint positions as seen from the outside are at two positions displaced in the axial direction of the rod as indicated by reference numeral 14. Specifically, the end surface of the joint part 32 is divided into six equal parts around the rod axis as shown in the AA ′ sectional view of FIG. Alternately form a concave surface and a convex surface in the axial direction of the rod body. The concave portions are shaded for clarity. The end surface of the joint portion 32 includes concave surfaces 46a, 46b, 46c and convex surfaces 47a, 47b, 47c. Due to the end faces provided so as to be alternately concave and convex, the end of the joint portion 32 has a claw-like shape for biting. Similarly, the end surface of the joint portion 34 is made to contact the concave surface and the convex surface of the end surface of the joint portion 32, as shown in the BB ′ sectional view of FIG. , Convex surfaces 48a, 48b, 48c and concave surfaces 49a, 49b, 49c are formed.

FIG. 3A is a developed perspective view showing the external appearance of the joint portions at the ends of both rod units in the example of FIG. Adjacent rod units are joined together by engaging the claw portions at their ends.

Returning to FIG. 1, the joint portion of the rod unit in the present invention is provided with a sealing piece 42 for ensuring the sealing property. The sealing piece 42 is a cylindrical component that is installed coaxially with the rod body axis and has a through hole. Both ends of the sealing piece 42 are inserted into each connected rod unit to form a pipe hole for each rod unit. 41 are in communication. A cylindrical concave hole for inserting the sealing piece 42 is formed at the end of each rod unit. The sealing piece 42 is notched at the outer edges of both ends thereof for installing the O-ring 40. The sealing piece 42 is first inserted into the recess after the O-ring 40 is installed. The O-ring 40 maintains the sealing property of the rod body inside the tube.

As described above, the claw portions of both rod units are engaged with each other while the sealing piece 42 is inserted and installed through the O-ring 40, and then the bolt holes 36 formed in the pipe walls of the joint portions 32 and 24 are inserted. , 38 and bolts 52 are fastened with nuts 54, thereby connecting and fixing both rod units. In order to fasten the bolt 52 and the nut 54, a bolt space 37 and a nut space 35 are formed on the outer circumference of the pipe walls of the joint portions 32 and 34. The fastening positions of the bolts and nuts are evenly arranged at a plurality of positions around the rod axis as illustrated. The fastening of the bolt 52 and the nut 54 effectively exerts a force on the O-ring 40, and the O-ring 40 is compressed to exhibit a good sealing property.

FIG. 2 shows another example of the present invention. FIG. 2A is a schematic cross-sectional view of a joint portion between the two rod units 13a and 13b. In FIG. 2, members similar to those of the example shown in FIG. 1 are denoted by the same reference numerals. A joint portion 32 for connecting with an adjacent rod unit is provided at the end of the rod unit 13a. Similarly, the rod unit 13b is also provided with a joint portion 34 at its end. Unlike the example of FIG. 1, in the example of FIG. 2, the end surfaces of the joint portion 32 and the joint portion 34 are uniform planes, and the joint position viewed from the outside is 1 in the rod axial direction as indicated by reference numeral 14. It is a place. In the example of FIG. 2, a cylindrical joint pin 56 is used to connect both rod units. 2B is a cross-sectional view taken along the line CC of FIG. As shown in FIG. 2 (B), there are three joint pins 56 in total, and they are installed at a position equidistant from the rod axis and equally dividing the entire circumference around the rod axis into three. Cylindrical recessed holes for inserting both ends of each joint pin 56 are bored at the ends of both joints 32, 34, and a space formed by the cylindrical recessed holes of both joints 32, 34. Each joint pin 56 is inserted and installed in.

FIG. 3B is a developed perspective view showing the external appearance of the joint portions at the ends of both rod units in the example of FIG.

In the example of FIG. 2 as well, as in the example of FIG. 1, a sealing piece 42 is provided at the joint portion of the rod unit in order to secure the sealing property. The structure and installation state are the same as in the example of FIG. That is, the sealing piece 42 is notched at the outer edges of both ends thereof for installing the O-ring 40. The O-ring 40 maintains the sealing property of the rod body inside the tube.

Further, in the example of FIG. 2 as well, both rod units are assembled through the joint pin 56 with the sealing piece 42 inserted and installed through the O-ring 40, and then the pipes of the joint portions 32 and 24 are joined. Both rod units are connected and fixed by passing the bolt 52 through bolt holes 36 and 38 provided in the wall and fastening with a nut 54. Also in this case, a bolt space 37 and a nut space 35 are bored on the outer circumferences of the pipe walls of the joint portions 32 and 34 for fastening the bolt 52 and the nut 54. As shown in FIG. 2 (B), the fastening positions of the bolts and nuts are evenly arranged at three locations, avoiding the position of the joint pin 56 around the rod axis. By fastening the bolt 52 and the nut 54, a force effectively acts on the O-ring 40, and the O-ring 40 is compressed to exhibit a good sealing property.

In any of the above examples, the fastening means of both rod units is not limited to the combination of the bolt and the nut, but taps may be provided in the bolt holes 36 and 38, for example. Further, in the example of FIG. 1, the claw portion in which the end face is divided into 6 equal parts to form the unevenness is shown as a suitable example, but the end face may be divided into 8 equal parts or non-equal parts to form the claw part. Both are possible. In the example of FIG. 2, the example in which the three joint pins are evenly arranged is a suitable example, but it is also possible to use another number or another arrangement.

[0024]

[Effect of the invention]

 As described above, in the present invention, both rod units are fastened and coupled by interlocking the claw shape formed at the end of the joint portion of the rod unit, or by coupling with a plurality of joint pins. As a result, it is easier to process than the conventional joint with a hexagonal cross section, and manufacturing costs and repair costs are reduced. It is also easy to repair.

Moreover, since the fitting precision can be increased, there is no rattling as in the conventional case, sufficient mechanical strength can be obtained, and the rotational torque can be reliably transmitted.

Further, in the method of the present invention, the coupling angle between the adjacent rod units is not limited to one angle. That is, in the example of FIGS. 1 and 2, three angular positions can be selected every 120 degrees around the rod body axis. Fitting and fastening work are easy and can be removed efficiently.

Further, due to the structure of the sealing piece installed on the rod axis so as to connect both rod units, the force effectively acts on the O-ring interposed between the rod and the joint. The reliable sealing can be done.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view of a joint portion of two rod units according to an embodiment of the present invention. (B) is a cross-sectional view taken along the line AA ′ of (A), and (C).
FIG. 7B is a sectional view taken along line BB ′ in (A).

FIG. 2A is a schematic cross-sectional view of a joint portion of two rod units according to another embodiment of the present invention. (B) is a CC sectional view of (A).

3A and 3B are respectively FIG. 1 and FIG.
FIG. 3 is a schematic exploded perspective view showing the outer appearance of the joint section of each embodiment shown in FIG.

FIG. 4 is a diagram schematically showing a general ground improvement device 10 and a ground improvement body construction process using the same.

FIG. 5A is a sectional view taken along the rod body axis showing an example of a joint structure in a conventional rod body 112. (B) is a DD sectional view of (A).

[Description of sign]

 10 Ground improvement device 12 Rod body 13a, 13b Rod unit 14, 114 Joint position 16 Stirring blade 18 Swivel 20 Supply pipe 22 Drive control part 32 First joint part 34 Second joint part 35 Nut space 36 First bolt hole 37 Bolt space 38 2nd bolt hole 40 O ring 41 Tube hole 42 Sealing piece 46a, 46b, 46c 1st claw part (concave surface) 47a, 47b, 47c 1st claw part (convex surface) 48a, 48b, 48c 2nd claw part (convex surface) 49a, 49b, 49c 2nd claw part (concave surface) 52 bolt 54 nut 56 joint pin 60 ground 62 ground improvement body 132 insertion side joint part 134 receiving side joint part 136a, 136b joint pin hole 138a, 138b screw hole 140 O-ring 41 lumen

Claims (2)

[Utility model registration claims] 1. A joint structure between rod units in a ground improvement rod body configured by connecting a plurality of rod units, wherein the first rod unit has an entire circumference around the rod body axis at an end thereof. A first claw portion having a convex surface and a concave surface so that adjacent end surfaces at different positions with respect to the rod body axial direction are end surfaces divided into a plurality of parts; A second claw portion having a concave surface and a convex surface corresponding to the convex surface and the concave surface forming the first claw portion of the first rod unit, and the rod body at the ends of the first and second rod units. A cylindrical sealing piece inserted through an O-ring into a cylindrical recessed hole provided coaxially with the shaft; and a state in which the sealing piece is inserted through the O-ring. Joint structures in soil improvement rod having a coupling means for connecting and fixing the said first rod unit and the second rod unit at. 2. A joint structure between rod units in a ground improvement rod body configured by connecting a plurality of rod units, each at a terminal end of a first rod unit and a second rod unit. A plurality of cylindrical joint pins to be inserted into a space formed by a plurality of cylindrical recessed holes provided at positions equidistant from the rod body axis and equally dividing the entire circumference, and the first and second joint pins. A cylindrical sealing piece inserted through an O-ring into a cylindrical recessed hole provided coaxially with the rod body axis at the end of the rod unit, and the plurality of joint pins and the sealing piece were inserted. In the state, the first rod unit and the second
Joint structure in the ground improvement rod body having a connecting means for connecting and fixing the rod unit of FIG.