JPH0630953Y2 - Thrust disperser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a thrust dispersing device for a small-diameter soft duct that is propelled and buried underground.

<Prior art> A method of propelling a soft duct in the ground is as follows: a casing that applies a pushing force to the front pipe is attached to the rear end of the front pipe, and the soft duct provided so as to cover the casing is the front pipe. A construction method in which the rear end is tightly connected and towed or partially propelled by direct jacking thrust is used.

Furthermore, recently, as a method of preventing thrust concentration on the soft duct to enable long-distance propulsion, ring-shaped expansion rings are equipped at multiple locations outside each casing,
A thrust dispersing device for feeding gas or liquid to the ring to press the ring to the soft duct and pulling each soft duct covered by each casing by the frictional force action between the expansion ring and the soft duct. Is being developed.

<Problems to be solved by the invention> In the traction and press-fitting methods, which are the thrust transmission means to the soft duct according to the conventional technology, both thrusts increase as the propulsion extension increases, and thrust is applied to the traction part and the press-fit part of the soft duct. Concentration occurs, causing damage to the soft duct.

Also, with the recently adopted expansion ring construction method,
Although it was possible to evenly and uniformly disperse the thrust in each soft duct, the area of the expansion ring inscribed in the soft duct is limited, and the soft duct thrust may increase depending on the soil conditions, resulting in insufficient friction force. In the current situation, thrust is applied directly to some soft ducts.

In addition, since the expansion ring blocks the space between the outside of the casing and the soft duct, it is not possible to see into the front pipe part, making it impossible to carry out propulsion surveying using targets and optics that have been used conventionally, and surveying by electromagnetic induction etc. I have to ask. The survey by the electromagnetic induction method has a problem when the attenuation due to the distance is significant and the construction method that requires the laying accuracy or the depth of the buried pipe becomes large like the sewer system. In addition, the device must be built in the small-diameter head tube, the mechanism is complicated, and the manufacturing cost is high.

At present, the blockage of the space between the outside of the casing and the soft duct also hinders the piping of various piping materials and the wiring of electric cables that operate the direction correcting jacks and the like mounted on the front pipe portion.

<Means and Method for Solving the Problem> The present invention is a mechanism for generating an even frictional force on the entire inner peripheral surface of each soft duct, and a target and various piping materials in the space between the outside of the casing and the soft duct. It is intended to provide a device capable of ensuring the communication hole of the.

As the method, a stretchable material formed in a ring shape is formed by tightly connecting both ends with flange plates fixed to both ends outside the casing to form a pressure chamber, and by supplying gas or liquid from a connecting pipe provided in the flange portion, The elastic material expands and closely contacts and supports almost the entire inner peripheral surface of the soft duct. In this way, by uniformly crimping the elastic material on the substantially entire inner peripheral surface of the soft duct, a large frictional force can be generated with a small pressure, and stable dispersion traction is enabled. Furthermore, since the pressure chamber mechanism by the flange plate described above is provided with a through space that penetrates the pressure chambers from both flange plates and is separated from the surrounding pressure chambers, this through space is used as a target collimation hole or a pipe. If it is used as a communication hole for passing materials,
The target can be used for surveying work and the installation of piping materials without impeding the pressurizing function of the pressure chamber, and the problems in the prior art have been solved.

<Embodiment> An embodiment according to the present invention will be described in detail with reference to FIGS. 1, 2, and 3.

The apparatus according to the present invention comprises a casing 2 having a fixed length in which an auger screw 9 for conveying tip cutting excavated soil to the vertical shaft side is installed, and the outside of the fixed length casing 2 has substantially the same length so as to cover the casing 2. The soft duct 1 is installed. Hollow flange plates 3 are fixed to the casing 2 at both ends outside the fixed length casing 2, and an elastic material 4 formed in an annular shape having substantially the same diameter as the outer diameter of the flange plate 3 is tightly bonded to the flange plates at both ends. The pressure chamber 10 is formed. A connecting pipe 5 for supplying gas or liquid for pressurizing the pressure chamber 10 is provided on the flange plate 3. Further, a target collimation hole 7 is installed through both flange plates 3 above each flange plate 3 so that the target installed in the front pipe part can always be seen during the propulsion. Plural communication holes 8 for passing the piping material and electric cable of the correction jack for correcting the direction of
It is a mechanism installed through. As shown in FIG. 2, the target collimation hole 7 and the communication hole 8 are constituted by a cylindrical through space which penetrates the inside of the pressure chamber 10 from both flange plates 3 and is separated from the surrounding pressure chambers 10. Therefore, the pressure in the pressure chamber 10 does not leak.

A description will be given of one embodiment using this thrust dispersing device.
A front pipe is installed in the vertical shaft, and the above device is installed behind the front pipe. When the installation is completed, gas or liquid is supplied to the pressure chamber 10 from the communication pipe 5, pressurizes the stretchable material 4 and makes close contact with the entire inner peripheral surface of the outer soft duct 1 to support the soft duct 1. Next, the auger screw 9 is rotated to excavate the tip face and convey the excavated soil, and at the same time, the pushing jack thrust is transmitted to the tail end of the casing 2 attached to the leading pipe, and the leading pipe and the casing 2 are grounded. Will be promoted inside. At this time, the outer soft duct 1 is pulled by the frictional force of the elastic member 4 and moves forward together with the casing 2. 1
When the main propulsion is completed, the valve 6 of the connecting pipe 5 is closed, and the first soft duct 1 is held by the compression of the elastic material 4. Then, the second thrust dispersing device is connected and installed, and gas or liquid is supplied to the second and first pressurizing chambers 10 through the connecting pipe 5 in the same manner as described above.
Each soft duct 1 is covered by the elastic member 4 of each casing 2.
The inner surface is crimped and supported by. At this time, the valve 6 of the communication pipe 5 of the first dispersion device is opened. Then, the jack thrust is transmitted to the tail end of the second casing 2 while rotating the auger screw 9 to perform propulsion. In this way, the propulsion is completed while repeating the above work in sequence, and the elastic material 4 is reduced by releasing gas or liquid from the communication pipe 5, and then the leading pipe and the casing 2
And the auger screw 9 is removed, and the propulsion of the soft duct 1 is completed. In this way, one soft duct 1
The mechanism is such that it is pulled by a large frictional force due to the inner contact of the entire inner peripheral surface of the elastic member 4 provided in the single covered casing 2.

A rubber material is used as the elastic material 4, and the thickness, hardness, etc. of the rubber material can be changed according to various conditions such as soil properties and propulsion extension.

<Effect of the Invention> The present invention makes it possible to generate a uniform frictional force on the entire inner peripheral surface of each soft duct by forming a pressure chamber composed of an elastic material and a flange plate outside each casing. Stable towing became possible, and no thrust was applied to the soft duct. Furthermore, by using the pressure chamber mechanism described above, it is possible to install a target collimation hole and a communication hole, and it has become possible to wire optical surveying and piping materials, which have been problems in the prior art.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a thrust dispersing device of the present invention.
FIG. 2 is a vertical cross-sectional explanatory view of a portion AA of FIG. Third
The figure is a longitudinal cross-sectional explanatory view showing the usage of the device. In the figure, 11 is a soft duct joint. Reference numeral 12 represents a casing joint.

Claims (1)

[Scope of utility model registration request] Claims: 1. A casing for imparting a thrust force to the leading end pipe is propelled, and a soft duct provided so as to cover the casing is tightly connected to the leading pipe to pull or partially thrust to directly embed it. In the construction method, a casing consisting of a fixed length containing an auger screw, a flange plate fixed to both ends outside the casing, a pressure chamber formed of an annular elastic material tightly bound at both ends by a plate, and a pressure chamber It is composed of a connecting pipe in which a pipe for supplying gas or liquid for pressurizing is provided in each flange portion, and a through space which is further provided so as to penetrate the pressure chamber from both end flange plates and is separated from the surrounding pressure chambers. By supplying gas or liquid to the pressure chamber, the annular expansion member expands, and the flexible duct provided so as to cover the casing. Thrust dispersion apparatus, characterized in that the annular elastic member is adapted to be crimped to the surface.