JPS6133116Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an auxiliary tool used when connecting each propulsion pipe with a connecting steel collar when burying communication cable protection pipes, sewerage pipes, etc. underground using the propulsion method of civil engineering construction. It is something.

Conventionally, the propulsion tubes were connected to each other by connecting the propulsion tube a to the end of the propulsion tube a, which was inserted into a tunnel already excavated by a shield machine or the like, in a shaft d, as shown in Figure 1. It was customary to carry out the process by placing it on a rail e laid in the shaft d and pushing it with a jack f, or by suspending it with a crane and pushing it with a jack f, so the butt was made using a steel collar b for connection. In the case of type joining, it was not possible to finely adjust the center axes of the propulsion tubes, the deviation was large, it was not easy to insert them into the steel collar b, and the work efficiency was poor. In addition, if the propulsion tube is forcibly inserted into the steel collar b with its center axes misaligned, the waterproof rubber ring c attached to the groove at the end of the propulsion tube may come off or peel off, causing water leakage. It was becoming.

In view of the above points, the present invention prevents the waterproof rubber ring attached to the end of the propulsion tube from coming off or twisting when the two propulsion tubes to be connected and the connecting steel collar are fitted together, and The present invention provides an auxiliary tool for connecting a propulsion pipe that can be easily fitted, and will be described in detail below with reference to the drawings.

2 to 6 show embodiments of the present invention,
1' is a vertical support rod with a U-shaped cross section, and 1'' and 1 are open-leg supports each having a U-shaped cross section and integrally connected by L-beams 3 and 4 at the bent parallel portions at the top. Each of these supporting rods 1', 1'', 1
A contact plate 5 for abutting against the inner circumferential surface of the end of the propulsion tube a is fixed to each tip of the propulsion tube a. The vertical support rod 1' and the split support rods 1'', 1 refer to the longitudinal long holes 6 provided in the vertical support rod 1' and the spread support rods 1'',
They are assembled and connected by inserting the assembly pin 8 through the round hole provided in 1. Numeral 9 is a fixing adjusting screw rod, which can be rotated by being fixed to a shaft supported by bearing support plates 11 protruding from both sides of the vertical support rod 1'. It is designed to fit into a cut groove made in the. The supporting rods 1', 1'', 1 assembled and connected by the assembly pins 8 are connected to the propulsion tube a by the respective contact plates 5, 5 at the tips of the split-legged supporting rods 1'', 1.
By tightening the nut 10 screwed onto the adjusting screw rod 9 fitted into the cut groove of the L-shaped steel 3, the L-shaped steel 3 and the open-legged support rod 1'', 1, push up the longitudinal support rod 1',
All the support plates 5 of support rods 1', 1'', 1 are attached to the propulsion tube a.
The end is pressed against the inner circumferential wall. 12 is each support rod 1',
1'', 1, one half of which fits inside each of the U-shaped support rods 1', 1'', 1 and is provided with a pin insertion hole 13, forming a U-shaped support rod. It has a cover plate 15 which has a cross section and has a nut 14 welded to the end face, and the other half has a shape in which only the back plate is extended, and a reinforcing piece 16 is provided in the center of the back plate. The gap retaining plate 12 includes a pin 18 inserted through a pin insertion hole 13 and a long hole 17 provided near the end of each support rod 1', 1'', 1, respectively, and a pin 18 inserted through a pin insertion hole 13 and a long hole 17 provided near the end of each support rod 1', 1'', 1, respectively. The support rods 1', 1'', and 1 are attached and connected by a horizontal plate 19 provided in the gap holding plate 12 and a gap adjustment bolt 20 passed through a nut 14 welded to a hole in the cover plate 15 of the gap holding plate 12. This is a nut welded and fixed to the gap adjustment bolt 20. 22 is a propulsion tube guide plate attached to the support rods 1', 1'', and 1, respectively, and when the propulsion tube a is inserted, its inner peripheral surface is pressed against the plate. Guide it so that it is on the same surface as the contact surface in step 5.

Therefore, when attaching the auxiliary device of the present invention to the propulsion tube a, in advance, the vertical support rod 1', the split-leg support rod 1'',
1 by an assembly pin 8, and fit the fixing adjustment screw 9 into the cut groove of the L-shaped steel 3 from the position shown by the chain line in FIG. Fit the end of the propulsion tube a on the side inserted into the inner circumferential surface of the propulsion tube a, place the stop plate 5 at the tip of the leg support rod 1'', 1 on the inner peripheral surface of the end of the propulsion tube a, and then tighten the fixing adjustment screw rod. Turn the nut 10 of 9 to push up the vertical support rod 1' against the split-legged support rods 1'', 1, and press the abutment plate 5 of the vertical support rod 1' against the inner peripheral surface of the end of the propulsion tube a. , the contact plates 5 of the support rods 1', 1'', 1 are all pressed against the inner peripheral surface of the end of the propulsion tube a.Therefore, the auxiliary tool of the present invention is firmly held at the end of one of the propulsion tubes a. Next, as shown in Figure 4, while suspending the connecting steel collar b with a crane, insert a portion of one end of the collar b to the extent that it does not reach the waterproof rubber ring c fitted into the propulsion pipe a. Then, by turning the gap adjustment bolt 20, the tip position of each gap holding plate 12 protrudes the same distance from the outer periphery of the propulsion tube a, and the steel collar b
The gap between the inner circumferential surface of the propulsion tube a and the outer circumferential surface of the propulsion tube a is made equal over the entire circumference. In such a state, the propulsion tube a to be connected is placed on a rail or suspended by a crane, and is screwed into the steel collar b fitted to the other propulsion tube a using jacks in the same way as shown in Fig. 1. to press against. At this time, the inner circumferential surface of the propulsion tube a on the side to be inserted is inserted along the propulsion tube guide plate 22, and the gap between the outer circumferential surface of each propulsion tube a and the inner circumferential surface of the steel collar is the entire circumference. Since they are equal, the two fit together without the waterproof rubber ring c turning over or shifting. Stop pressing the propulsion tube a just before the central annular projecting wall b _a of the steel collar b comes into contact with the gap retaining plate 12, and then tighten the nut 10 screwed into the fixing adjustment screw rod 9.
is loosened to release the pressure contact of each contact plate 5 with the inner circumferential wall of the propulsion tube a, and the threaded rod 9 is rotated to remove it from the cut groove of the L-shaped steel 3, and the assembly pin 9 is pulled out to support it in the vertical direction. The rod 1' and the open-legged support rods 1'', 1 are separated and removed from the propulsion tube a.Then, the propulsion tube a to be connected can be pushed into the ground with a jack.
Both propulsion tubes are fully connected. The auxiliary tool of the present invention that has been disassembled and taken out may be used in the same manner as described above for the subsequent connection of the propulsion pipe.

Although the above embodiment shows the case where the number of support rods is three, the number of support rods may be greater than three.

As described above, the auxiliary device of the present invention has the tip of each support rod fixed under pressure to one of the propulsion tubes to be connected.
The gap between the inner circumference of the connecting steel collar and the outer circumference of the propulsion tube can be made equal around the entire circumference by adjusting the protrusion length of the gap retaining plate, and the inner peripheral wall of the propulsion tube can be guided by the propulsion tube guide plate. By doing this, when fitting the steel collar and both propulsion tubes to be connected, the waterproof rubber ring can be inserted without coming off or turning over, and the connection of the propulsion tubes becomes extremely easy. Work efficiency can be improved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the propulsion pipe connection in the shaft, Figure 2
The figure is a front view of the embodiment of the present invention showing the state in which the propulsion tube is attached, Figure 3 is an enlarged sectional view of the same main part, Figure 4 is a side cross-section of the same main part, and Figure 5 is a side view of the central part. FIG. 6 is a side view of the gap holding plate. 1', 1'', 1... Support rod, 12... Gap holding plate, 22... Propulsion tube guide plate, a... Propulsion tube, b
...Steel color.

Claims (1)

[Scope of utility model registration request] Three or more support rods are connected at their proximal ends so that they can be assembled and disassembled, and the tips of these support rods are press-contacted to and released from mutually spaced points on the inner wall of the end of the propulsion tube, respectively. A propulsion tube guide plate that guides the inner circumferential wall of the propulsion tube is provided at the tip of each support rod to protrude in the lateral direction, and a gap retaining plate with a half portion protruding in the longitudinal direction from the tip of each support rod is attached to the protrusion length. An auxiliary tool for connecting a propulsion pipe, characterized in that it is attached so that the height can be adjusted.