JPH0274790A - Curve joint device for concrete pipe in concrete pipe propelling method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a concrete pipe curve joint device used in curve construction using the concrete pipe propulsion method.

(Prior art) In a conventional semi-shield excavator used in the concrete pipe propulsion method for burying concrete pipes underground, the shield body a is divided into a front shield b and a rear shield C, as shown in Fig. 7. In some cases, the space between these shields b and c can be bent freely by a steering cylinder d.

Construction along curves is possible.

The semi-shield excavator as described above is attached to the tip of a concrete pipe e that is propelled underground by a propulsion device (not shown) installed in a one-shot shaft.
Along with the propulsion, the concrete pipe e is propelled while excavating the front face of the concrete pipe e, and the excavated earth and sand is taken into the shield body a and then transported to the concrete pipe e by means of earth and sand conveying means such as a screw conveyor f and a heald conveyor g. It is designed to be carried out from the inside to the rear.

(Problems to be solved by the invention) In the concrete pipe propulsion method using a semi-shield excavator as described above, and the small diameter pipe propulsion method in which a small diameter pipe is propelled underground and buried in a similar manner, During straight construction, each concrete pipe e is connected by a straight joint h, but when performing one curve construction, an opening i occurs at the joint part of concrete pipe e on the outer circumferential side of one curve, as shown in Figure 8. do. As a result, the thrust force is transmitted only on the inner circumferential side of the joint part of the concrete pipe e, so that the surface pressure at this part exceeds the strength of the concrete, causing defects in the concrete pipe e.

In order to improve the above problems, conventional concrete pipe e
If an opening i occurs in the joint part of the joint, press fit a wedge-shaped camber j into the opening i as shown in Fig. 9, insert a turnbuckle k as shown in Fig. 1O, or As shown in the figure, the concrete pipes e are connected by a hinge pin l, and by making each concrete pipe e bendable around the hinge pin l, a driving force is applied only to the inner circumferential side of the concrete upper pipe e. This prevented them from concentrating.

However, since the opening amount between each concrete pipe varies depending on the radius of the curve to be constructed, the conventional method described above requires adjustment work to match the opening amount. In the case of diameter pipes, there was a problem that it was difficult to implement.

This invention was made with the aim of improving the above-mentioned problems, and aims to provide a curved joint for a concrete pipe that is capable of transmitting thrust force evenly around the entire circumference of the concrete pipe, even in small-diameter pipes that cannot be accessed by a single worker. It is something.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides concrete pipe propulsion in which a shield excavator capable of freely controlling the direction is attached to the tip of a concrete pipe to be buried and propelled underground. In the construction method, the connection part of the concrete pipes is connected between a retainer fitted to the end of each concrete pipe, a taper spacer interposed between the tapered surfaces formed on these retainers, and the outer peripheral part of each retainer. By connecting with the curve joint body made of fitted collars, even if an opening occurs at the joint between the concrete on the outer circumferential side of the two curves when constructing nine curves.

The present invention provides a concrete pipe curve joint device for use in a concrete pipe propulsion construction method, in which the taper spacer moves toward the opening side to transmit propulsive force.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 and 2.

In the figure, 11 is the shield body of the semi-shield propulsion machine used in the concrete pipe propulsion method.

Consists of front shield 1a and rear shield 1b.

The space between these can be freely bent by a steering shield 3.

The shield main body l is attached to the tip of a concrete pipe 2 to be buried and propelled underground, and the front shield la has a main body l attached to the tip of a concrete pipe 2 to be buried.

A force 7 head 5 rotated by a cutter head drive motor 4 is provided, and the earth and sand excavated by this head 5 is taken into the shield body 1 and then transferred to a screw conveyor 6, a belt conveyor (not shown), etc. The earth and sand are transported rearward inside the concrete pipe 2 by means of earth and sand conveying means. On the other hand, the connecting portion of the concrete pipe 2 that is propelled into the burial mound is connected by a curved joint main body 10, which is an embodiment of the present invention.

As shown in FIG. 2, the curve joint main body 10 is
It consists of a retainer 11 made of cast iron fitted into the connection part of each concrete pipe 2, a taper spacer 12 made of the same material interposed between these retainers 11, and a collar 13 formed of an iron plate.

The retainer 11 has a cylindrical fitting part 11a having an outer diameter approximately equal to the outer diameter of the concrete pipe 2, and this cylindrical fitting part 11a is connected to a small diameter part 2a formed on the outer periphery of the end of the concrete pipe 2. It is designed to fit into the small diameter part 2a.
A rubber seal ring 14 provided on the outer peripheral surface of the container is pressed against the inner surface of the container to maintain a liquid-tight state.

Further, an annular portion 11b having an inner diameter approximately equal to the inner diameter of the concrete pipe 2 is formed on one end side of the cylindrical fitting portion 11a, and one end surface of the annular portion 11b is in contact with the end surface of the concrete pipe 2. At the same time, a tapered surface 11C having an oblique angle of approximately 456 to 60 degrees is formed on the other end surface. These tapered surfaces 11c are arranged to face each other when the retainer 11 is fitted to each end of the concrete pipes 2 to be connected to each other as shown in FIG. The taper spacer 12 is contacted from the inner circumferential side.

The taper spacer 12 has a tapered surface 12a on its outer periphery that contacts the tapered surface 11a of the retainer 11 at the same time.

A V-shaped recess on the ridgeline? The cross section in which 1112b is formed is approximately in the shape of Mt. Fuji.

A brim-like protrusion 13a protruding from the inner circumferential surface of the collar 13 fits into the groove 12b of the taper spacer 12, so that the collar 13 can be centered.

The collar 13 has a cylindrical shape, and is designed to fit into the recessed part 11 (l) formed on the outer periphery of the annular part 11b of Linina II. The seal ring 14 is pressed against the inner circumferential surface to maintain liquid tightness, and the protrusion 13a is provided in a protruding manner at the center of the inner circumferential surface.

Next, to explain the operation, the concrete pipe 2 with the shield body ■ attached to the tip is propelled underground by a propulsion device (not shown) installed in the starting shaft, and the shield body 1
As the shield is propelled, the cutter head 5 excavates the earth and sand in front, takes it into the shield body 1, and carries it out to the rear.

In addition, the concrete pipes 20 are connected by the above-mentioned curve joint body 10, but during straight construction, the spaces between the concrete pipes 2 may bend and the concrete pipes 2 may meander, so when performing straight construction, the curve joint body 10 As shown, a meandering prevention fitting 15 for fixing the taper spacer 12 at the center position is attached to the inner circumferential surface of the annular portion 11b from the inside of the curved joint body 10 using a fixing device 16. This snake j′:r
The vi clasp J: 415 is, for example, a ring that is divided into upper and lower halves and has a substantially T-shaped cross section, as shown in Fig. 4.
Meandering in all directions can be prevented by preventing movement of the taper spacer 12 by bringing the outer peripheral surface of the protrusion 15a into contact with the entire inner peripheral surface of the taper spacer 12.

To prevent meandering in the vertical direction, as shown in FIG. 17 may be provided. On the other hand, when constructing a curved line, remove the meandering prevention fitting 15 and install the taper spacer z2.
can move along the tapered surface 11c of each retainer 11, and in this state, the concrete pipe 2 is propelled.

The thrust force applied to the concrete pipe 2 is sequentially transmitted to the concrete pipe 2 in front via the retainer 11 and the taper spacer 12 as shown by the arrows in FIG. 6, but each concrete pipe 2 is bent along a curve. Concrete pipe 2
When an opening occurs on the outer circumferential side of the retainer, the taper spacer 12 moves toward the opening side along the tapered surface 11c of the retainer 11 to transmit the propulsive force, as shown in FIG. 6, so that one opening occurs. Also, the driving force is not concentrated only on the inner peripheral side of the concrete pipe 2, but is evenly distributed over the entire circumference of the concrete pipe 2.

Also, at this time, the protrusion 13a of the collar 13 fits into the groove 12b of the taper spacer 12, and the collar 13 is centered at the center of the connection, ensuring that dirt, sewage, etc. do not enter through the opening. It will be possible to prevent this from happening.

As described above, even if an opening occurs on the outer circumferential side of the concrete pipe 2 that is advanced along the curve, the taper spacer 12 moves according to the amount of opening of the two openings and automatically transmits the propulsive force evenly. After burying the concrete pipe 2 along one curve, a finishing robot or the like that can move freely inside the concrete pipe 2 removes the inner circumferential surface of the taper spacer 12 on the one-opening side and buries it between the tapered surfaces 11c of the Tina 11. By filling the void 18 formed in the pipe with mortar or the like, the inner surface of the pipe 1 can be finished flush with the concrete pipe 2.

(Effects of the Invention) As described in detail above, this invention connects the joints of concrete pipes to be buried with curve joints, so that even if openings occur at the joints of concrete pipes during one-curve construction, The taper spacer of the curve joint automatically moves according to the mouth opening amount, allowing the thrust to be transmitted through the taper spacer, so the thrust can be transmitted evenly around the entire circumference of the concrete pipe. It becomes like this.

This eliminates problems such as the propulsion force concentrating only on the inner circumference of the concrete pipe and causing the concrete pipe to break, and eliminates the need for workers to adjust the gap according to the opening amount as in the past. Therefore, it is possible to easily perform curved construction even on small-diameter pipes with an inner diameter of 800 μ or less, which cannot be accessed by two workers.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a cross-sectional view of a semi-shield propulsion machine, and Fig. 2 is an enlarged view of Fig. 1.
．． Figure 3 is a cross-sectional view with the meandering prevention fittings installed, Figure 4
5 and 5 are explanatory diagrams of the meandering prevention metal fitting, FIG. 6 is an explanatory diagram of the function, and FIGS. 7 to 1I are explanatory diagrams of the conventional method. Patent applicant: Komatsu Ltd. (patent attorney) Todai Matsuzawa

Claims (3)

[Claims] (1) In the concrete pipe propulsion method, in which a shield excavator that can freely control the direction is attached to the tip of the concrete pipe to be buried and propelled underground, the connecting part of the concrete pipe is fitted to the end of each concrete pipe. The combined retainers are connected by a curved joint body consisting of a taper spacer interposed between the tapered surfaces formed on these retainers, and a collar fitted between the outer peripheries of each retainer. Curve joint device for concrete pipes in concrete pipe propulsion method. (2) Attach the collar 13 to the ridgeline of the taper spacer 12.
2. The concrete pipe curve joint device according to claim 1, wherein a concave groove 12 is formed into which the protrusion 13a protrudes from the inner circumferential surface of the concrete pipe. (3) The concrete pipe curve joint device according to claim (1), further comprising a meandering prevention fitting 15 for fixing the taper spacer 12 at the center position of the concrete pipe 2 during straight construction.