JP3478708B2 - Split structure of the direction control mechanism for the tip device for pipe propulsion - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small diameter pipe propulsion method for laying cable laying pipes, water and sewer pipes, gas pipes, etc. in the soil without digging, The present invention relates to a divided structure of a direction control mechanism of a tip device for propelling a pipe to be propelled.

[0002]

2. Description of the Related Art FIGS. 6 to 9 are explanatory views of an example of a construction process of pipe laying in a compaction-free soil-free type pipe propulsion tip device by a small diameter pipe propulsion method. FIG. 6 (a) shows a form in which the original pushing device D is installed in the launch stand A, and the pipe propulsion tip device (hereinafter abbreviated as tip device) C is installed thereon, and FIG. Shows a form in which the source pressing jack D1 of the source pressing device D is extended and the tip device C is pressed into the soil.
FIG. 6C shows a form in which the original pushing jack D1 of the original pushing device D is contracted to provide a gap corresponding to the length of the pipe laid in the soil, and FIG. 6D shows the rear of the tip device C. It shows a form in which a pipe E to be laid in the soil is attached to the gap formed in 1. In addition, B in the figure is a standing resistance.

FIGS. 7A to 7D show a pipe E laid in the soil.
It shows the process of sequentially promoting. FIG. 7A shows a state in which the head C1 is extended by the tip jack incorporated in the tip device C to excavate the soil, and thereafter, FIG.
As shown in (b), the source push jack D1 of the source pusher D is extended, and the tip end device C and the pipe E are propelled by the amount by which the head C1 of the tip end device C has dug the soil in the previous stroke. . (This method is called the double propulsion method. In the case of the compaction-free earth-removal method, which has greater resistance during pipe propulsion compared to the excavation and earth-removal method, it is effective to adopt the double-propulsion method as a means to reduce the required thrust. It has been demonstrated that there is.)

FIG. 7C shows a state in which the head C1 of the tip device C is tilted and extended to control the direction.
7 shows a state in which the pipe propulsion construction is advanced while the positional deviation of the propulsion direction in the tip device C is appropriately corrected in such a direction, and FIG. 7D shows the head C1 during the direction control in the tip device C. The state in which the tip pushing device C and the pipe E are propelled into the soil by extending the source pushing jack D1 of the source pushing device D by the amount of the dug in the soil.

8 and 9 show a process in which the tip device C reaches the reaching shaft B and removes the tip device C from the reaching shaft B. The case where the reaching shaft B is smaller than the starting shaft A is illustrated, and the removal method will be described below as an example under the condition that the entire tip device C cannot be removed from the reaching shaft B at one time.

FIG. 8A shows a form in which the tip device C reaches the reaching shaft B, and the divided portion C2 of the front and rear structure of the tip device C is located in the reaching shaft B. 8 (b)
Shows a state in which the front structure CA of the tip device C is removed from the reaching shaft B after the device is divided and separated at the dividing portion C2 position of the tip device C.

In FIG. 9 (a), by extending the original pushing jack D1 of the original pushing device D on the side of the starting shaft A, the rear structure CB of the tip device C remaining in the soil is pushed into the reaching vertical shaft B. 9B, after that, as shown in FIG. 9B, the rear structure CB of the tip device C is separated from the pipe E,
The rear structure CB of the tip device C is removed from the reaching shaft B.

FIG. 5 is a schematic structural diagram including a direction control mechanism of a conventional tip device. Tip jack F in tip device C
There is a built-in directional control mechanism capable of tilting up, down, left, right and straight in five directions. By this direction control mechanism, the tip jack F can be tilted in any direction, and the tip device C is controlled in any direction. Is what you can do.

Next, a conventional direction control mechanism of the tip device will be described with reference to FIG. Tip head C1 of tip device C
The partition H at the rear of the tip jack F that activates
The jack receiver G and the quadrangular pyramid J are integrally connected, and four tilting hydraulic cylinders L are arranged at the positions corresponding to the four surfaces of the quadrangular pyramid J, and the piston rod of this hydraulic cylinder L is arranged. The wedge body K is attached to the tip, and the quadrangular pyramid body J moves up and down, left and right, or straight by sliding the required surface of the wedge body K and the quadrangular pyramid body J by the forward and backward movement of the predetermined wedge body K by the predetermined hydraulic cylinder L. The tip jack C itself is tilted around the spherical seat M as the center of rotation by tilting the tip jack F with respect to the direction to control the direction of the tip device C.

The division position in the structure of the conventional tip device C is the position C2 shown by the broken line in FIG. 5, and the tip device C is divided into the front structure CA and the rear structure CB at this boundary. It has a structure that can be divided. The detailed structure of this portion will be described with reference to FIG. The front structure CA and the rear structure CB of the tip device C are fastened with a cap nut N. Further, the tip jack F is integrally incorporated in the jack receiving tool G, and the jack receiving tool G and the quadrangular pyramid J are sandwiched by the partition wall H which is a part of the front structure CA, and the inner cap nut J1. It is concluded by.

[0011]

The conventional division structure of the tip device C has a problem in the work after division. The problem will be described with reference to FIG. FIG. 4 shows a front structure C at a division position C2 in the division structure of the conventional tip device.
The form which separated A and the back structure CB is shown. After the structures are separated from each other, the directional control mechanism in the tip device C is divided. This separation work is performed by the inner cap nut J1.
When it is rotated in the direction of loosening, the quadrangular pyramid J is separated from the screw connection portion on the quadrangular pyramid J side, and the quadrangular pyramid J is separated from the jack receiver G. In this way, the separation work of the tip device C is completed by separating the front structure CA and the rear structure CB outside the tip device C and then separating the internal direction control mechanism.

The problem of the divided structure of the tip device C is that the quadrangular pyramid J separated from the jack receiver G loses its support and falls off inside the device due to the weight of the quadrangular pyramid J itself (about 60 kg). It was difficult to join the heavy quadrangular pyramid J to the jack receiver G during the joining work which is naturally performed after the dividing work. The state in which the quadrangular pyramid J is dropped is shown by the one-dot chain line J'in FIG.

[0013]

SUMMARY OF THE INVENTION The present invention provides a divided structure for a direction control mechanism of a tip device, which solves the above-mentioned problems, and is characterized by a front structure and an outer structure of the tip device. A partition is provided inside each of the rear structures as a part, and the jack receiver and the quadrangular pyramid that constitute the direction control mechanism in the tip device are engaged between these two partitions.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 relates to a divided structure of a direction control mechanism of a tip device according to the present invention, in which front and rear structures outside the tip device and a direction control mechanism inside the tip device are combined. It is a figure. FIG. 2 is a view showing the divided structure of the direction control mechanism of the tip device of the present invention, in which the front and rear structures outside the tip device and the direction control mechanism inside the tip device are separated. In the drawings, the same reference numerals as those in FIGS. 3 and 4 represent the same parts.

Referring to FIG. 1, the divided structure of the direction control mechanism of the tip device of the present invention will be described. The front structure CA and the rear structure CB, which form the outside of the tip device C, are fastened to each other by a cap nut N. Further, in the direction control mechanism in the tip device C, the tip jack F is integrally incorporated in the jack receiver G, and the jack receiver G is supported by the partition wall H provided inside as a part of the front structure CA. The quadrangular pyramid J is supported by the partition I provided inside as a part of the rear structure CB, and the jack receiver G and the quadrangular pyramid J are engaged with each other at the uneven portion C2.

Next, referring to FIG. 2, a state in which the direction control mechanism of the tip device according to the present invention is divided by the dividing section will be described. When the cap nut N that fastens the front structure CA and the rear structure CB, which are the outer structures of the tip device C, is rotated in the direction of loosening, the screw disengages from the screw connection point on the rear structure CB side, and the front The partial structure CA and the rear structure CB are separated, and the jack receiver G and the quadrangular pyramid J are separated. At this time, the jack receiver G and the quadrangular pyramid J are engaged with each other only by engaging the concave and convex portions C2a and C2b with each other, so that they can be easily separated.

[0017]

As described above, according to the divided structure of the direction control mechanism of the tip device of the present invention, the tip structure and the rear structure constituting the outside of the tip device are separated from each other, and the tip structure is separated. The jack receiver that constitutes the direction control mechanism in the device and the engaging portion of the quadrangular pyramid can also be separated at the same time,
In addition, since each of them is supported by the partition wall which is a part of the structure of the tip device, there is no problem of dropping off after separation, so that the joining work naturally performed after the dividing work can be easily performed.

[Brief description of drawings]

FIG. 1 is a sectional view of a direction control mechanism of a tip device for pipe propulsion according to the present invention.
FIG. 7 is a configuration diagram in which a direction control mechanism in the tip device is combined with the tip device.

FIG. 2 is a sectional view of the direction control mechanism of the tip device for pipe propulsion according to the present invention.
FIG. 3 is a view showing a form in which a direction control mechanism in the tip device is separated.

FIG. 3 is a view showing a division structure of a direction control mechanism of a conventional tip device for pipe propulsion, in which front and rear structures outside the tip device and a direction control mechanism in the tip device are combined.

FIG. 4 is a view showing a divided structure of a direction control mechanism of a conventional tip device for tube propulsion, in which front and rear structures outside the tip device and a direction control mechanism in the tip device are separated.

FIG. 5 is a schematic structural diagram including a direction control mechanism of a conventional tube propulsion tip device.

6 (a) to 6 (d) are explanatory views of an example of a construction process of pipe laying in the tip device for pipe propulsion of the compaction-free and soil-elimination type pipe propulsion by the small diameter pipe propulsion method.

7 (a) to (d) are process diagrams in which pipes laid in the soil are sequentially propelled.

8 (a) and 8 (b) are explanatory views in which the pipe propulsion tip device reaches the reaching shaft and removes the front structure.

9 (a) and 9 (b) are explanatory views for removing the rear structure of the pipe propulsion tip device from the reaching shaft.

[Explanation of symbols]

C tube propulsion tip device CA front structure CB rear structure C1 tip head C2 division F tip jack G jack receiver J square pyramid L hydraulic cylinder K wedge H, I bulkhead N, J1 cap nut M, spherical seat

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Takashi 1 Tayacho, Sakae-ku, Yokohama-shi Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Minoru Tanaka 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nihonhon Telegraph and Telephone Corp. (72) Inventor Tetsuya Asano 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corp. (72) Inventor Junichi Shirakawa 3-18-10 Moto-Asakusa, Taito-ku, Tokyo Inside the Airec Giken Co., Ltd. (72) Inventor Toshio Akiyama 3-18-10 Moto-Asakusa, Taito-ku, Tokyo Inside the Airec Giken Co., Ltd. (56) Reference JP-A-8-326473 (JP, A) Publication 62-34915 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/08 E21D 9/093

Claims (3)

(57) [Claims] 1. A partition wall is provided inside each of a front structure and a rear structure forming an outer side of a tip device for pipe propulsion, and direction control in the tip device is provided between these two partition walls. A divided structure of a tip propulsion device direction control mechanism for pipe propulsion, characterized in that a jack receiver constituting the mechanism is engaged with a quadrangular pyramid. 2. The jack receiver is supported by a partition wall which is a part of the front structure, and the quadrangular pyramid is supported by a partition wall which is a part of the rear structure. 1
The divided structure of the direction control mechanism for the tip device for pipe propulsion described. 3. The divided structure of the tip propulsion device direction control mechanism for pipe propulsion according to claim 1, wherein the jack receiving member and the quadrangular pyramid are engaged with each other in the lengthwise direction at the uneven portion.