JPS6156390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermediate pushing device for propelling concrete pipes.

In the propulsion method of burying a concrete pipe underground while pressurizing it, if the pipe is long, the pressure from the shaft will not advance the pipe, and a jack for intermediate pushing is used in the middle to combine the pushing force of this jack with the pressure from the shaft. The tube is propelled by pressure. During this period, the jack has been used several hundred times or more, and as a result, there is a risk that earth and sand may enter between the intermediate pushing sleeve 2 and the insertion-side concrete pipe 1' and damage the surface of the insertion-side concrete pipe 1. Due to this friction, the water-stopping rubber ring provided between the intermediate push sleeve and the concrete pipe 1' on the insertion side wears out and becomes useless for water-stopping.

The present invention is a device for perfecting the water-tightness of the intermediate pushing part of such a concrete pipe for propulsion, and in which the circumference of the concrete pipe on the insertion side is covered with a cylindrical iron plate body to increase the strength of the pipe. At the same time, several rubber rings are installed on the surface of the concrete pipe to ensure complete water-stopping properties.Furthermore, through-holes for injecting lubricant are provided in the wall of the concrete pipe, and through these holes, several rubber rings are installed for water-stopping. The purpose of this is to inject and fill the space between the rubber rings with a lubricant to prevent friction between the rubber rings.

An embodiment of the device of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a sectional view of the entire intermediate push device, and FIG. 2 shows an enlarged sectional view of point A in FIG. 1. FIG. 3 shows a cross section of the through hole portion of the concrete pipe 1'. Reference numeral 1 denotes a concrete pipe which has been previously buried, and this concrete pipe 1 is for intermediate pressing, and an intermediate pressing sleeve 2 made of a steel plate is integrally formed at the pipe end on the receiving side. Reference numeral 1' denotes a concrete pipe connected to the concrete pipe 1 for intermediate pressing. This pipe is also a connecting pipe for intermediate pressing, and the insertion part is made large with a step, and this part is covered with a cylindrical iron plate body 8. Then, several water-stop rubber rings 6 are installed at the part of the concrete pipe 1 that comes into contact with the intermediate pressing sleeve 2. This rubber ring is locked by a locking annular steel piece 7 to prevent it from moving due to the operation of the intermediate push jack 3. The annular steel piece 7 may have a circular cross section like the steel plate shown in the figure or a square cross section. As shown in FIGS. 2 and 3, a through hole 5 is formed in the wall of the concrete pipe 1' between the several water stop rubber rings 6. Several through holes 5 are provided as shown in the figure, and the lubricant is injected from the through holes 5 in the direction of the arrows and filled between the several water stop rubber rings 6.

In the figure, reference numeral 3 is a jack for intermediate pushing, and 4 is a stopper wheel, which is provided to prevent damage to the end face of the concrete pipe due to the operation of the jack. Reference numeral 9 denotes a water-stopping expansible material interposed on the concrete surface of the intermediate pushing jack 2 integrally formed with the concrete pipe 1, and prevents water leakage and mud leakage from this part.

Since the intermediate pushing device of the present invention has the above-mentioned structure, the intermediate pushing jack 3 is operated in the propulsion method to press the concrete pipe 1 into the soil one after another. Depending on the length of installation, this may be repeated several hundred times or more, so the intermediate push sleeve 2 and the insertion side of the concrete pipe 1' must be able to withstand the friction, and also take measures to ensure complete leakage of water and mud. As in the invention, a cylindrical iron plate body 8 is provided around the circumference of the concrete pipe 1' on the inlet side.
If a lubricant is injected and filled between the several water-stop rubber rings 6 provided on the surface of the steel plate 8, the surface of the concrete pipe 1' on the insertion side can be covered with rubber rings without damage. It prevents wear and is completely watertight, and conventionally, water leaks from this part.
This will prevent serious accidents such as ground cave-ins caused by mud leakage and allow pipe burying work to proceed smoothly.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of the entire intermediate press device of the present invention, and FIG. 2 is a detailed sectional view of the main part A of the same. FIG. 3 is a cross-sectional view of the lubricant injection hole on the insertion side of the concrete pipe 1'. 1, 1'... Concrete pipe, 2... Sleeve for intermediate push, 3... Jack for middle push, 4... Jack ring, 5... Lubricant injection hole, 6... Water stop rubber ring, 8... Cylindrical Shaped iron plate body.

Claims (1)

[Claims] 1. In an intermediate pushing device that installs a jack 3 for intermediate pushing in the middle of the joint of concrete pipes 1 and 1' and presses it in, a middle pushing sleeve 2 made of a copper plate is integrally buried on the receiving side of the concrete pipe 1, and the intermediate pushing sleeve 2 is inserted. A cylindrical steel plate body 8 is coated around the circumference of the side concrete pipe 1' at the point where it contacts the intermediate push sleeve 2, and several water stop rubber rings 6 are attached to this appropriate device. An annular steel piece 7 for stopping rubber rings is attached to the front and rear of the rubber ring, and a hole 5 for injecting a lubricant is penetrated at an intermediate position between the several water stop rubber rings 6 to form a joint between the concrete pipes 1 and 1'. This is an intermediate pushing device for a concrete pipe for propulsion, in which a jack 3 for intermediate pushing is installed in the middle of the concrete pipe, and a slipping material is injected and filled between the rubber rings 6 from the hole 5.