JPH04161696A - Propellent body device for jacking method - Google Patents

Abstract

PURPOSE:To improve the efficiency of execution by connecting propellent bodies for forcing a propellent head into the ground with two bendable connections and providing an elastic seal material in one connection and a means for changing over the bent and straight state of the propellent body in the other connection. CONSTITUTION:Propellent bodies B consisting of a plurality of pipe bodies 2 for forcing a propellent head for laying a buried pipe or the like in the ground are connected with two bendable connections J. While an elastic deformable seal member 10 is interposed in one connection, a change-over means K for changing over the bendable and unbending state is provided in the other connection. When the propellent bodies B are bent, a gap therebetween is blocked from the intrusion of earth, sand, etc., and the propellent body B in the straight propulsion is prevented from bending, so that the efficiency of execution can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a propellant device used in a propulsion method.

[Conventional technology]

Such a propellant device is used not only when propelling the propellant in a straight line through the soil, but also when propelling the propellant in a curved manner through the soil. Therefore, as a propellant device that can be used when propelling a propellant in a curved manner in the ground, there is one that is provided with a plurality of connecting portions in which adjacent propellant bodies are connected in a flexible manner.

Specifically, in order to make the connecting portion between adjacent propellant bodies bendable, there is a structure in which a gap is provided between opposing end faces of both propellant bodies to allow the bending.

However, while the above-mentioned gap is an effective space for securing the above-mentioned bending during the construction of the propulsion method in which the propellant is propelled in a curved manner in the soil, it is easy for foreign objects such as earth and sand to enter there and become clogged. If a blockage occurs, the space becomes an inconvenient space that makes the bending difficult.

Therefore, the present inventors press-fit an elastically deformable seal member between the opposing end surfaces of the two adjacent propellant bodies,
We have previously developed a propellant device with a simple structure that enables the bending due to the elastic deformability of the sealing member, and prevents the intrusion of foreign substances such as earth and sand by the presence of the sealing member, thereby avoiding the above-mentioned inconvenience. .

[Problem to be solved by the invention]

However, even in the above-mentioned propellant device developed by the present inventors, there are problems that should be improved as described below.

That is, when the propellant device is wound up and stored on a winding drum, the structure of the connecting portion is not sufficiently bent, and the propellant device cannot be rolled up and stored in a compact manner. There are some problems that need to be improved. Therefore, it is possible to increase the number of bendable connecting parts, but if the number is simply increased, smooth propulsion will not be possible when the propellant is propelled linearly in the soil. A problem will arise.

The present invention has been made in view of the above circumstances, and it is possible to avoid the problem of the above-mentioned inconvenience by preventing foreign matter such as earth and sand from entering into the gap, and to wind the propellant on the winding drum. The purpose of the present invention is to provide a propellant device with a simple structure that can be rolled up and stored compactly when stored, and can also be smoothly propelled even when the propellant is propelled linearly in the ground. It is said that

[Means to solve the problem]

A characteristic configuration of the propellant device for a propulsion method according to the present invention is such that a part of the plurality of connecting portions is formed by press-fitting an elastically deformable sealing member between opposing end surfaces of both the mutually adjacent propellant bodies. one connecting portion, and the remaining portions of the plurality of connecting portions are switched between a first state in which a bent posture of the connecting portion is allowed and a second state in which the bent posture is prohibited and maintained in a straight posture. The second connecting portion includes a means, and its functions and effects are as follows.

[For production]

In such a propulsion device for a propulsion construction method, the presence of an elastically deformable sealing member press-fitted between the opposing end surfaces of the two propellants in the first connecting portion prevents the intrusion of foreign substances such as earth and sand. .

Furthermore, when it is desired to bend the propellant device appropriately in order to propel the propellant in a curved manner in the soil or to compactly wind and store the propellant on a winding drum, the first connecting portion The elastic deformability of the elastically deformable sealing member provided therein allows the connecting portion to bend, and in the second connecting portion, the switching means allows the connecting portion to be bent. By switching to the first state in which the connecting portion is bent, the propellant device can be bent appropriately at any of the connecting portions.

Furthermore, when it is desired to propel the propelling body linearly in the soil, the switching means is used in the second connecting part to switch the connecting part to a second state in which the connecting part is held in a linear posture. This prevents the propellant from bending and allows the propellant to move smoothly in a straight line through the soil.

〔Effect of the invention〕

Therefore, according to the propellant device of the present invention, it is possible to prevent the intrusion of foreign matter such as earth and sand into the gap in the first connecting portion, thereby avoiding the problem of the above-mentioned inconvenience, and to attach the propellant to the winding drum. Even when the propellant is rolled up and stored, it can be rolled up and stored compactly, and furthermore, even when the propellant is propelled linearly in the ground, smooth propulsion is possible. Moreover, in the propellant device of the present invention, a portion of the connecting portion has a structure in which the sealing member is press-fitted into the gap, resulting in a simple structure.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

A plurality of propellants (B) constituting the propellant device according to the present invention
As shown in FIG. 5, the propulsion head (1) and a plurality of propulsion tubes (2) are composed of any combination, which are connected in advance via a connecting portion (J).

Such a propelling body (B) is propelled into the ground by a propulsion device, and the propulsion device is configured as described in detail below.

That is, in order to hold and press the propulsion pipe (2) in the construction pit (5) and propel the propulsion head (1) connected to its tip into the soil, the propulsion pipe (2).・Propulsion head that pushes into the soil (1) Propulsion suppression device (3)
At the same time, a guide member (4) is provided for guiding the plurality of propulsion pipes (2) into the soil while keeping their axes aligned substantially in a straight line near the point where the plurality of propulsion pipes (2) are to be penetrated into the soil. It is being Further, a winding drum (6) for winding and storing the propulsion tubes (2) is provided outside the upper part of the construction pit (5). In addition, (14) in the figure is the construction pit (5)
(15) in the figure is a support jack that supports the side wall of the winding drum (B) from the inside so that it does not collapse. 17) is a guide roller that guides the

The propulsion head (1) includes a head main body (IA) with a small diameter of, for example, 50 to 70 mm, and a propellant axis (P) (propulsion It consists of an excavation part (IB) attached to the tip side so as to be rotatable around the head axis (P).

The excavation part (IB) receives earth pressure as the propulsion head (1) is propelled into the soil, and is configured to bias the propulsion direction of the propulsion head (1) in the direction in which the upper pressure is received. The pressure receiving surface (F) is formed as an inclined surface near the axis (P) on the distal end side. When the propulsion head (1) is made to advance straight, the excavation portion (IB) is rotated relative to the head body (IA) while being propelled;
When turning, it is propelled with the pressure receiving surface (F) facing the opposite side to the side to be turned, and due to the earth pressure that the pressure receiving surface (F) receives, the direction of propulsion of the propulsion head (1) is directed to the pressure receiving surface (
F) will now be directed to the opposite side.

A connecting portion (J) that bendably connects adjacent ones of the plurality of propellants (B), that is, a connecting portion (J) that bendably connects the propulsion head (1) and the propulsion tube (2). The connecting portion (J) and the connecting portion (J) that bendably connects adjacent propulsion tubes (2) are configured as detailed below (see Figs. 1 to 4). reference).

That is, in the connection part (J), the rear (Figs. 1 to 4)
In the figure, the left side corresponds to the rear).
The joint member (12) is screwed and fixed, and its propellant (
A fitting receiving part for receiving the joint member (12) so as to be able to swing freely in a direction perpendicular to the propellant core (P), on the end (B,) of the propellant body (B) adjacent to the front of the propellant body (B). (13) is formed. The joint member (12) is provided in a posture along the longitudinal direction of the propelling body (B), and is attached to a shaft portion (12a) formed at the rear part.
) and a spherical joint part (12b) formed at the front part thereof. The shaft portion (12a) is screwed and fixed to the front portion of the rear propulsion body (B), and the spherical joint portion (12a) is screwed and fixed to the front portion of the rear propulsion body (B).
2b) is swingably fitted into a fitting receiving part (13) provided at the rear of the front propelling body (B).

Some of the plurality of connecting parts (J) are shown in FIGS. 1 and 2 (
As shown in A) and (B), a first connecting portion formed by press-fitting an elastically deformable sealing member (10) between opposing end surfaces of the drawing advancing bodies (B) and (B) that are adjacent to each other; (J,
). The first connecting portion (J1) can take the bent position shown in FIG. 2(A) due to the elastic deformability of the sealing member (10). Furthermore, the presence of the seal member (10) prevents foreign matter such as earth and sand from entering.

In addition, the remaining parts of the plurality of connecting parts (J) are shown in FIGS. 1 and 3.
As shown in FIGS. 4 and 4, a switching means (K) is provided for switching between a first state in which the connecting portion (J) is allowed to be in a bent position and a second state in which the bent position is prohibited and maintained in a straight position. The second connecting portion (J2) includes a second connecting portion (J2).

Specifically, the switching means (K) is a ring-shaped member having a tension part (8a) that comes into contact with the end (B, ) of the forward propelling body (B) to realize the second state. A stopper (8) is provided. In addition, in the present embodiment, the tension portion (8a) is in the second state when the rear propulsion body (8a) is in the second state.
It also comes into contact with the end (B2) of B).

The rear end surface of the stopper (8) is uneven, and the portion corresponding to the convex portion is wide to form the tension portion (8a). The stopper (8) is provided with a bush (21) that functions as a slide member and a slide bearing on the outer surface of the joint mounting portion (B4).
), and the presence of the bushing (21) allows for smooth sliding in the direction of the propellant axis (P) and rotation around the propellant axis (P). It has become. The bush (21) is made of a slide bearing made of, for example, sintered alloy or Teflon. Further, a space (S) that allows the tension portion (8a) of the stopper (8) to retreat from the end (B1) is located at the front end (B2) of the rear propelling body (B). It is formed.

According to such a stopper (8), it is possible to prevent the propellant core (P
) by appropriately rotating the strut portion (8a) around the adjacent propelling body (B), and the end portion (B, ) of (B).

(B2) Both propellant bodies (B), (B
) by tensioning the connecting part (J) so that it does not take a bent position, the second state is achieved, while rotating it again as appropriate around the propellant core (P) and then tightening the tension part. (8a) into the space (S), the connecting portion (J) of both the propelling bodies (B) and (B)
By enabling the person to assume a bent posture, the first
It is possible to realize the state.

Further, at the end (B2) of the rear propelling body (B) where the space (S) is provided, a covering part (B8) is formed to cover the space (S). More specifically, the end (B2) of the rear propulsion body (B) has an inner diameter larger than the outer diameter of the stopper (8) toward the front thereof, and an outer diameter that is larger than the outer diameter of the propulsion body main body. A ring-shaped sheathing part (B3) approximately equal in outer diameter extends from the propellant body, and the sheathing part (B3) extends from the propellant body.
B2) surrounds the space (S) and covers it from the outside. The covering portion (B3) extends from the propellant body to the extent that it also covers the end surface of the rear propellant (B) where the end (B2) contacts the stopper (8) in the second state. It has been extended. In addition, its covering part (B3
) and the stopper (8) are interposed with an annular seal member (22), and the seal member (
22) prevents the intrusion of earth and sand.

When the connecting portion (J) of the propellant (B) is configured in this way, the space (S) is covered at the end (B2) of the propellant (B) where the space (S) is provided. Since the covering part (l) is formed, the existence of the covering part (B,) causes the space part (S,
) will now be shielded. Therefore, foreign matter such as earth and sand is prevented from entering from the outside in that part.

In addition, in this embodiment, the covering portion (B,) is attached to the end portion (B2) of the rear propelling body (B) in the second state.
Since it extends from the propeller body to the extent that it also covers the abutting end surface that comes into contact with the object, the abutting end surface in the second state is shielded from the outside, and foreign matter such as earth and sand cannot enter from the outside in that part. This will prevent you from doing so.

[Another example]

As shown in FIG. 6, the switching means (K) has a contact portion (18a) that comes into contact with the end (B1) of the forward propelling body (B) to realize the second state. An embodiment consisting of a nut-shaped stopper (18) is also conceivable. Note that the switching between the second state and the first state in the abutting portion (18a) is performed at the end (B2) of the rear propelling body (B).
This is done by adjusting the amount of engagement between a threaded part formed on the outer periphery and a threaded part formed on the inner periphery of the stopper (18) that is threaded therewith.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 to 5 show an embodiment of a propellant device for a propulsion construction method according to the present invention, and FIG. 1 is a longitudinal sectional view showing both a first connecting portion and a second connecting portion of the propellant device. , Figure 2 (A),
(B) is a vertical cross-sectional view showing the first connecting portion of the propellant device divided into a first state and a second state, and FIG. Fig. 4 is an exploded perspective view showing the main parts;
FIG. 5 is a side view showing the entire propulsion device including the above-mentioned propulsion device, and FIG. 6 is a longitudinal sectional view showing another embodiment of the propulsion device for the propulsion method according to the present invention. (10)... Seal member, (B)...
Propellant, (K)...Switching means, (J)...
...Connection part, (J1)...First connection part, (J
2)...Second connecting part.

Claims (1)

[Scope of Claims] A propulsion device for a propulsion construction method, comprising a plurality of connecting portions (J) in which adjacent propellants (B) and (B) are connected in a flexible manner, the plurality of connecting portions ( A first connecting portion (J) is formed by press-fitting an elastically deformable sealing member (10) between opposing end surfaces of the mutually adjacent propelling bodies (B).
__1), and the remaining portions of the plurality of connecting portions (J) are maintained in a first state in which a bent posture of the connecting portions (J) is allowed and in a second state in which the bent posture is prohibited and held in a straight posture. a second coupling part (K) comprising switching means (K) for switching between
J_2) A propulsion device for propulsion construction method.