JPH0511197B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a propulsion forming apparatus for forming a concrete pipe and burying it horizontally while pouring fresh concrete underground.

(Prior Art) Conventionally, when burying a concrete pipe horizontally in the ground, a driving method has been adopted in which a horizontal hole is drilled and the concrete pipe is forcibly pushed into the horizontal hole.

(Problems to be Solved by the Invention) In the case of the above method, an excessive pressing force is required to push the concrete pipe, making it difficult to bury concrete in hard ground.

SUMMARY OF THE INVENTION An object of the present invention is to provide a propulsion forming device that can avoid the above-mentioned problems and streamline concrete pipe burying work.

(Means for Solving the Problems) The concrete pipe propulsion forming device of the present invention has a cylindrical inner frame tube and an outer frame tube at the rear end of a horizontally cylindrical propulsion tube that is propelled horizontally underground. The cylindrical formwork is co-movably connected with the cylindrical formwork arranged concentrically on the inside and outside with a space for forming a concrete pipe. A feed pipe for feeding fresh concrete into the cylindrical form is inserted into the upper end of the space, and a feed pipe is inserted into the upper end of the cylindrical wall to face an injection port opened at the upper end of the inner frame cylinder. to open the discharge port, the upper end of the space is rotatably driven to one rotation end and the other rotation end reversed by 180 degrees from this rotation end, and the discharge port is closed at the one rotation end; At the other rotation end, a hollow disk-shaped flow path switching member is installed to close the injection port, and when the flow path switching member is rotated to both rotation ends, a flow path switching member is installed in the flow path switching member that closes the injection port. a horizontal pipe that is directly connected to the horizontal pipe; and a horizontal pipe that is orthogonally connected to the center of the horizontal pipe, and when the flow path switching member is rotated to one end of rotation, the inlet and the flow path in the horizontal pipe are connected to each other. and a vertical pipe that communicates the outlet with the flow path in the horizontal pipe when the flow path switching member is reversed to the other rotation end. have

(Function) In the space between the cylinder form that is connected to the rear end of the propulsion cylinder and has an inner frame cylinder and an outer frame cylinder arranged side by side inside and outside, and a cylinder wall installed inside this cylinder form. When feeding fresh concrete into the cylindrical form through a feed pipe inserted through the upper end, a horizontal pipe is connected directly to the feed pipe, and a horizontal pipe is connected perpendicularly to the center of the horizontal pipe. When the flow path switching member installed in the middle of the feed pipe is rotated to one rotation end, the injection pipe opened at the upper end of the inner frame cylinder and the vertical pipe are connected. The flow path in the feed pipe is communicated with the branch pipe, and the discharge port opened at the upper end of the cylindrical wall is closed by the flow path switching member, and the ready-mixed concrete is poured into the cylindrical shape through the injection port. sent into the frame. The flow path switching member
When reversed by 180 degrees, the outlet and the flow path in the feed pipe are communicated with each other by the branch pipe, and the injection port is closed by the flow path switching member, so that fresh concrete and cleaning Water is discharged into the cylinder wall through the outlet and the branch pipe.

(Example) Next, an example of the present invention will be described with reference to the drawings.

In the propulsion forming device S installed to form a concrete pipe and bury it underground while pouring fresh concrete while propulsion in the horizontal direction underground, the propulsion tube 1 is a vertical hole excavated in the vertical direction. It is formed into a horizontal cylindrical shape in order to drill a horizontal hole by propelling it horizontally at the lower end, and near the front end of the inside thereof is used to excavate the ground near the front opening of the propelling cylinder 1 by rotating motion. A suitable number of excavation blades 2 arranged radially and rotationally driven by hydraulic actuators are rotatably supported concentrically, and near the center of the inner circumferential surface of the propulsion cylinder 1 is a water supply pipe connected to a water supply system on the ground. A water tank 4 is provided around the front end surface of the water tank 4 to inject water forward to turn the ground in front of it into mud and to assist the propulsion operation of the propulsion cylinder 1. A large number of injection pipes 5 are protruded and arranged in the direction.

In order to pour fresh concrete into the movement trace of the propulsion tube 1 and create a concrete pipe while the propulsion tube 1 is being propelled, a cylinder form 6 connected to the rear of the propulsion tube 1 is placed at the rear end of the propulsion tube 1. The cylindrical frame 6 is fitted with a cylindrical inner frame 7, which is connected to the front end of the inner frame 7 via a connecting plate 9, and which is connected to the front end of the inner frame 7 via a connecting plate 9. An outer frame tube 8 which is fitted around the front and has a length shorter than the inner frame tube 7 is arranged concentrically with the inside and outside. A pair of injection ports 10, 10 at the front and rear are opened in order to inject the fresh concrete into the upper end of the cylinder form 6, and a large number of injection ports 10, 10 are opened in the inner frame cylinder 7 to discharge moisture in the fresh concrete. Small hole 7a,
7a is installed through the inner frame cylinder 7, and on the back side of the inner frame cylinder 7, a concrete pipe is used to fill the entire circumference of the cylinder form 6 with the ready-mixed concrete poured from the upper end of the cylinder form 6 by vibration action. A large number of electric vibrators 27 to 27 arranged in the circumferential direction are fixed.

A cylinder wall 12 arranged in parallel inside the cylinder frame 6 is integrally connected to the inner frame cylinder 7 via front and rear walls 13A, 13A and a partition wall 13B, and has a cylinder wall 12 at its upper end facing both injection ports 10, respectively. While the discharge ports 11, 11 are opened, a feeding pipe 20 is inserted into the upper end of the space 14 formed circumferentially between the cylindrical wall 12 and the cylindrical form 6. In order to shorten the hardening time of the ready-mixed concrete filled in the cylindrical form 6, a steam pipe 15 connected to an above-ground steam supply device is inserted into the space 14, and the fresh concrete filled in the cylindrical form 6 is blown out from the steam pipe 15. Steam fills the space 14 through a large number of ventilation holes 16 provided through each partition wall 13B, and the fresh concrete in the cylindrical form 6 is heated. Also,
The cylinder wall 12 is pressed forward by a hydraulic pressure device (not shown) in order to propel the propelling cylinder 1 forward, and each time the concrete pipe C is formed to a predetermined length, a pressing cylinder of the same shape as the cylinder wall 12 is pressed forward. Connected to the rear.

To correct the propulsion direction of the propulsion tube 1,
The water tank 4 and the cylindrical frame 6 are attached to the rear inner peripheral surface of the
A suitable number (four in this example) of hydraulic cylinders 17 are interposed between the cylinders 17 and 17, and the tips of their respective piston shafts 17a are brought into contact with the front end surface of the cylindrical frame 6 via the balls 18, respectively. When the light emitting beams 19a of the projectors 19, which are arranged at equal intervals in the circumferential direction and are installed facing backwards with respect to the center of the propulsion tube 1, deviate from the central axis of the concrete pipe C, the deviation direction and The amount of deviation is read by a reader outside the side hole, and the flow rate adjustment valve of the hydraulic circuit is manually operated to control the forward and backward movement of the piston shaft 17a of each hydraulic cylinder 17 in accordance with the direction and amount of deviation of the light beam 19a. By doing so, the eccentric movement of the propulsion tube 1 can be corrected, and the propulsion tube 1 can be made to move straight concentrically with the concrete pipe C.

An inlet 10 and an outlet 1 are provided at the upper end of the space 14.
A pair of front and rear hollow disk-shaped flow path switching members 21, 21 sandwiched between the front and rear parts 1 and a front and rear pair of hydraulic cylinders 25 each having a piston shaft that moves forward and backward in the horizontal direction are installed. A pinion 24 meshing with a rack 26 connected to a piston shaft of a hydraulic cylinder 25 is attached to a shaft portion 21a extending laterally at the center of the member 21.

The flow path switching member 21 is rotationally driven to one rotation end and the other rotation end which is reversed by 180 degrees from this rotation end by the forward and backward movement of the piston shaft of the hydraulic cylinder 25, and at one rotation end, the discharge port is closed. 11 is closed, and the injection port 10 is closed at the other rotation end.

In the flow path switching member 21, when the flow path switching member 21 is inserted into the center of the flow path switching member 21 and rotated to both rotation ends, a feed pipe 20 is inserted into the flow path switching member 21, respectively.
A horizontal pipe 22a is directly connected to the horizontal pipe 22a, and a flow path switching member 2 is connected to the center of the horizontal pipe 22a.
1 is rotated to one end of rotation, the horizontal pipe 22
It stands upright above the horizontal pipe 22a to connect the inlet 10 and the flow path in the horizontal pipe 22a, and when the flow path switching member 21 is rotated to the other end of rotation, it stands upright below the horizontal pipe 22a and the discharge port 11 A T-shaped branch pipe 22 having a vertical pipe 22b communicating with the flow path in the horizontal pipe 22a is installed so as to be rotatable together.

During propulsion of the propulsion tube 1 and tube form 6, the piston shaft of the hydraulic cylinder 25 and the rack gear 26 move, the flow path switching member 21 rotates to one end of rotation, and the inlet 10 is opened via the branch pipe 22. Feeding pipe 20
The discharge port 11 is maintained in a closed state by communicating with the flow path inside, and the fresh concrete pumped through the feed pipe 20 is sent into the cylindrical form 6 through the branch pipe 22 and the injection port 10. When the propulsion tube 1 is stopped, the piston shaft of the hydraulic cylinder 25 is retracted by manual operation of a switching valve (not shown), and the flow path switching member 21 is reversed to the other end of rotation, and the discharge port 11 is connected to the branch pipe. Feed pipe 20 via 22
The injection port 10 is maintained in a closed state by communicating with the flow path inside the feed pipe 20, and when water is fed into the feed pipe 20 instead of fresh concrete in this state, the feed pipe 20
The fresh concrete and water remaining in the pipe are transferred to branch pipe 2.
2 and into the cylinder wall 12 through the discharge port 11, and the inside of the feed pipe 20 and the inside of the branch pipe 22 can be washed with water.

In addition, after the concrete pipe C is buried, the propulsion forming device S can be inserted into a vertical hole drilled in front of the horizontal hole and taken out.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, a cylindrical inner frame tube 7 and an outer frame tube 8 are placed at the rear end of a horizontally cylindrical propulsion tube 1 that is propelled horizontally underground.
The cylindrical forms 6 are co-movably connected to each other, and the cylindrical forms 6 are arranged concentrically in parallel with each other, with the cylindrical forms 6 separated from each other. A feed pipe 20 for feeding fresh concrete into the cylindrical form 6 is inserted, and a discharge port 1 is provided at the upper end of the cylindrical wall 12 opposite to the injection port 10 opened at the upper end of the inner frame 7.
1 is opened, and the upper end in the space 14 is rotatably driven to one rotation end and the other rotation end which is reversed by 180 degrees from this rotation end, and the discharge port 11 is opened at the one rotation end.
A hollow disk-shaped flow path switching member 21 is installed to close the inlet 10 at the other end of rotation, and the flow path switching member 21 is rotated to both ends of rotation. In this state, the horizontal pipe 22a is directly connected to the feed pipe 20, and when the flow path switching member 21 is connected perpendicularly to the center of the horizontal pipe 22a and is rotated to one rotation end, there is an inlet. 10 and the flow path in the horizontal pipe 22a, and when the flow path switching member 21 is reversed to the other rotation end, the vertical pipe 22b communicates the discharge port 11 with the flow path in the horizontal pipe 22a. The branch pipe 22 is installed so that it can rotate together.

Therefore, it is possible to save labor and working time by eliminating the work of conveying and moving the concrete pipe, and there is an effect that the burying work of the concrete pipe can be made safer and more rational.

Furthermore, when the propulsion tube 1 and excavation blade 2 hit the hard ground and stop, the flow path switching member 21 is reversed to stop the pressure feeding of the ready-mixed concrete into the cylindrical form 6, and also to stop the feed of fresh concrete into the feed pipe 20. The inside of the feed pipe 20 can be cleaned by stopping the pressure feeding of the fresh concrete, forcing water to the feed pipe 20, and discharging the fresh concrete remaining in the feed pipe 20 from the discharge port 11.

Since the concrete pipe C is formed while propelling the propulsion tube 1 and the tube form 6, the pressing force for propelling the propulsion tube 1 remains constant even if the length of the formed concrete pipe increases. Propulsion tube 1
When concrete pipes that have already been formed are placed in conventional construction methods, the sliding resistance between the concrete pipes and the ground increases as the number of connected concrete pipes increases. This has the effect of eliminating the problem of increased pressing force required for driving.

(Effects of the Invention) By having the configuration as described above, the present invention can accurately feed fresh concrete into the cylinder, and after pouring the fresh concrete,
When the feeding of ready-mixed concrete to the feeding pipe is stopped, the work of cleaning the inside of the feeding pipe can be simplified and made more efficient.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the thrust forming device, and FIG.
3 is an enlarged sectional view taken along the line X2-X2, and FIG. 4 is a sectional view taken along the line X3-X3 of FIG. 3. 1... Propulsion tube, 6... Cylinder form, 7... Inner frame tube,
8... Outer frame tube, 10... Inlet, 11... Outlet, 12... Cylinder wall, 20... Feeding pipe, 21... Channel switching member.

Claims (1)

[Claims] 1. At the rear end of a horizontally cylindrical propulsion tube that is propelled horizontally underground, a cylindrical inner frame tube and an outer frame tube are separated by a gap for forming a concrete pipe. The cylindrical forms arranged concentrically on the inside and outside are joined together so that they can move together, and fresh concrete is applied to the upper end of the space between the cylindrical form and the cylindrical wall installed inside the cylindrical form. A feed pipe for feeding the inner frame is inserted, a discharge port is opened at the upper end of the cylinder wall opposite to an injection port opened at the upper end of the inner frame cylinder, and a discharge port is opened at the upper end of the inner frame cylinder. A hollow disk-like shape that is rotatably driven between one rotating end and the other rotating end that is reversed by 180 degrees from this rotating end, and which closes the outlet at one rotating end and closes the inlet at the other rotating end. A flow path switching member is installed, and in this flow path switching member there is a horizontal pipe that is directly connected to the feed pipe when the flow path switching member is rotated to both rotation ends, and a horizontal pipe that is directly connected to the feed pipe. The flow path switching member is connected orthogonally to the central portion, and when the flow path switching member is rotated to one rotation end, the inlet and the flow path in the horizontal pipe are communicated, and the flow path switching member rotates to the other rotation end. A concrete pipe propulsion forming apparatus, characterized in that a branch pipe having a vertical pipe that communicates the discharge port and a flow path in the horizontal pipe in a reversed state is installed so as to be rotatable together.