JPS62248799A - Propulsion molding equipment for concrete pipe - 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 (Field of Industrial Application) The present invention relates to a propulsion forming device for forming concrete pipes and horizontally burying the pipes 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-mentioned construction method, an excessive pressing force is required to push the concrete pipe, making it difficult to bury concrete or the like 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 present invention involves placing ready-mixed concrete at the rear of a horizontally cylindrical propulsion cylinder for horizontal propulsion underground. In order to form a concrete pipe, a cylindrical formwork in which a cylindrical inner frame tube and an outer frame tube are arranged side by side inside and outside is installed concentrically. A feed pipe for pressure-feeding fresh concrete 1- into the cylindrical frame is inserted into the space between the cylinder walls arranged in parallel, and the feed pipe is inserted into the space. The gist of the present invention is a propulsion molding device equipped with a flow path switching member that is driven and controlled to selectively communicate between an inlet opened at the upper end of the frame cylinder and an outlet opened at the upper end of the cylinder wall. It is something to do.

(Function) When burying a concrete pipe, the device of the present invention propels a horizontally cylindrical propulsion tube horizontally underground, and pumps fresh concrete into the cylinder form that moves forward following the propulsion tube. The structure is such that the fresh concrete in the cylindrical form is heated with steam, and the concrete pipe is continuously formed along the track of the movement of the propulsion tube while being buried underground.

(Example) Next, one embodiment 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, a radial cylinder is used to excavate the ground near the opening of the propelling cylinder 1 by rotational movement. A suitable number of cutting blades 2 arranged in a row and rotated by a hydraulic actuator are rotatably supported in a concentric manner, and a water supply pipe is connected to a water supply system on the ground near the center of the inner peripheral surface of the propulsion cylinder 1. 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 ejection rA pipes 5 are protruded and arranged in the direction.

Place fresh concrete on the site where the propulsion tube 1 was moved and replace the propulsion tube 1.
Promoted to create concrete pipes during the promotion of! 11
A cylinder frame 6 connected to the rear of the cylinder frame 6 is fitted to the rear end of the propulsion cylinder 1 so as to be able to move together with the cylinder frame 6, and a cylindrical inner frame cylinder 7 and this inner frame The inner frame tube 7 is connected to the front end of the tube 7 via the connecting plate 9 and is fitted around the front part of the inner frame tube 7.
An outer frame cylinder 8, which has been shortened due to its superiority, is arranged concentrically on the inside and outside, and at the upper end of the inner frame cylinder 7, ready-mixed concrete, which is pumped through the feed pipe 20, is transferred to the upper end of the cylinder form 6. A pair of injection ports 10 and 10 are opened in the front and rear for injection, and a large number of small holes 7a and 7a are provided in the inner frame tube 7 to drain moisture in the fresh concrete, and Inner frame WI
On the back side of the cylindrical form 6, a large number of If 1 are arranged in the circumferential direction in order to fill the entire circumference of the cylindrical form 6 with the fresh concrete injected from the upper end of the cylindrical form 6 by vibration action.
71 vibrators 27-27 are fixed.

The cylindrical walls 12 arranged in parallel inside the cylindrical frame 6 are spaced apart from the inner frame 7 by the front and rear walls 13A, 13A, and the space between them. ! The cylinder wall 12
In order to shorten the hardening time of the fresh concrete filled in the cylindrical form 6, a space 14 formed circumferentially between the cylindrical form 6 and the cylindrical form 6 is connected to an above-ground steam supply device. A steam pipe 15 is inserted, and the steam ejected from the steam pipe 15 fills the space 14 through a large number of ventilation holes 16 penetrated through each partition wall 13B, and the ready-mixed concrete in the cylindrical form 6 is heated. be done. In addition, the cylinder wall 12 is pressed forward by a hydraulic pressure device (not shown) in order to propel the propulsion cylinder 1 forward, and each time the concrete 1/pipe C is formed into a predetermined length, the cylinder wall 12 is pressed forward.
A press cylinder having the same shape as 2 is connected to the rear of the cylinder wall 12.

Thrust 31 In order to correct the propulsion direction of the cylinder 1, an appropriate number of pieces (four in this example) are attached to the rear part of the inner circumferential surface of the thrust cylinder 1 and interposed between the water tank 4 and the cylinder frame 6. ) are arranged at equal intervals in the circumferential direction, with the tips of their respective piston shafts 17 a in contact with the front end surface of the cylinder frame 6 via the balls 18 , and are arranged at equal intervals in the circumferential direction. The light beam 19a of the floodlight 19, which is installed facing backward, is the concrete pipe C.
When the projection beam 19a deviates from the central axis, the direction and amount of the deviation are read by a reader outside the side hole, and the flow adjustment valve of the hydraulic circuit is manually operated to correspond to the direction and amount of deviation of the projection beam 19a. Then, the piston shaft 17a of each hydraulic cylinder 17 is controlled to advance and retreat, thereby correcting the eccentric movement of the propulsion tube 1, so that the propulsion tube 1 can move straight concentrically with the concrete pipe C.

A pair of front and rear flow path switching members 21 and 21 each formed in a hollow disk shape connects the feed pipe 20 to the inlet 10 and the outlet 1.
1 to selectively communicate with one of the cylinders 1 to force feed fresh concrete into the cylinder form 6 while the propulsion cylinder 1 is being propelled, and to feed the fresh concrete into the cylinder form 6 when the propulsion cylinder n1 stops mid-propulsion. In order to stop the operation and wash the inside of the feed pipe 20 with water, an amphoteric inlet 10 and a re-breathing outlet 11 are connected to the upper end of the space 14.
The flow path switching member 21 has a horizontal pipe 22a directly connected to the water supply pipe 20, and a horizontal pipe 22a connected orthogonally to the center of the horizontal pipe 22a. T-shaped branch pipes 22 each having a vertical pipe 22b that selectively communicates with the inlet 10 and the outlet 11 are installed therein, and are horizontally arranged in the center of both flow path switching members 21, respectively. A pinion 2 is attached to the shaft portion 21a.
4 are fitted and meshed with the rack gear 26 attached to the piston shaft of the hydraulic cylinder 25, and the pinion 24 and the shaft portion 21a rotate in forward and reverse directions as the piston shaft of the hydraulic cylinder 25 and the rack gear 26 move forward. Flow path switching member 2
Rotation is controlled in forward and reverse directions within a range of 1800 degrees. and,
During the propulsion of the propulsion tube 1 and tube form 6, the screw shaft and rack gear 26 of the hydraulic cylinder 25 are held in a moving state, and the flow path switching member 21 is connected to the vertical pipe 22 of the branch pipe 22.
b is held in communication with the injection port 10, and the feed pipe 2
The fresh concrete pumped through the tube 1 is fed into the cylindrical form 6 through the branch pipe 22 and the injection port 10.
When the piston shaft of the hydraulic cylinder 25 is stopped, the piston shaft of the hydraulic cylinder 25 is turned off by manual operation of a switching valve (not shown), the flow path switching member 21 is reversed by 180 degrees, and the vertical pipe 22b of the branch pipe 22 is turned off.
is connected to the discharge port 11, and in this state, a switching valve (not shown) is manually operated to force feed water into the feed pipe 20 instead of the ready-mixed concrete, and the ready-mixed concrete in the feed pipe 20 is transferred to the vertical pipes 22b and 22b. The water can be discharged from the discharge port 11 into the cylinder wall 12, and then the water can be discharged from the discharge port 11 to wash the inside of the feed pipe 20 and the branch pipe 22 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.

Now, when burying a concrete pipe, the propelling molded bag @S charged into the vertical hole is pushed in the horizontal direction by a hydraulic device through the cylinder wall 12, and at the same time, the excavation blade 2 is rotationally driven and water is poured from the injection pipe 5. is injected to propel the propulsion tube 1 forward while excavating the ground in front, and the feed pipe 20 and both flow path switching member 21 are fed into the tube form 6 which moves forward following the propulsion tube 1.
The fresh concrete is pumped through the cylinder form 6, and while being filled with the fresh concrete, it is heated by the steam introduced into the space 14, and concrete pipes C are continuously created as the cylinder form 6 moves forward. It can be buried underground while

Therefore, labor and work time can be reduced by eliminating the work of conveying and moving the concrete pipe, and the burying work of concrete 1-I& can be made safer and more rational.

In addition, when the propulsion tube 1 and the excavation blade 2 hit hard ground and stop, the flow path switching member 21 is reversed and the tube formwork 6 is rotated.
At the same time, the pressure feeding of the ready-mixed concrete to the feed pipe 20 is stopped and the feed pipe 2 is stopped.
The inside of the feed pipe 20 can be cleaned by pumping water to the feed pipe 20 and discharging the fresh concrete remaining in the feed pipe 20 from the discharge port 11h1.

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. The propulsion tube 1 can be propelled accurately, and when concrete pipes that have already been formed are placed in conventional construction methods, the sliding resistance between the concrete pipe 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 pouring concrete pipes.

(Effects of the Invention) In other words, the present invention has the following advantages: At the rear of a propulsion tube formed in a horizontally cylindrical shape for horizontal propulsion underground, fresh concrete is poured on the trail of movement of the propulsion tube. In order to form a tube, a cylindrical form in which a cylindrical inner frame and an outer frame are arranged side by side inside and outside is arranged concentrically, and the cylindrical form and the inner side of this cylindrical form are arranged side by side. A feed pipe for pumping fresh concrete into the cylindrical form is inserted into the space between the provided cylinder wall, and the feed pipe is inserted into the space between the inner frame and the upper end of the inner frame cylinder. In order to selectively communicate with the inlet opened at the top of the cylinder wall and the discharge port opened at the upper end of the cylinder wall, a drive is made!
By installing the flow path switching member that can be used in both directions, it has the effect of reducing the labor required for burying the concrete pipe and making the burying work safer and more rational.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional view of the propulsion forming device, Fig. 2 is a cross-sectional view taken along the line Xl-X1 in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line The line enlarged sectional view, FIG. 4, is X3-X3i of FIG. 3! ! FIG. 1... Propulsion tube 6... Cylinder form frame 7... Inner frame Cylinder 8... Outer frame Cylinder 10... Inlet port 11... Outlet port 12... Cylinder wall 20. ...Feeding pipe 21...Flow path switching member

Claims (1)

[Claims] Behind the horizontally cylindrical propulsion tube for horizontal propulsion underground, a cylindrical inner frame tube is placed behind the propulsion tube to form a concrete pipe by pouring ready-mixed concrete into the movement trace of the propulsion tube. A cylindrical form in which a cylindrical frame and an outer frame cylinder are arranged side by side inside and outside are arranged concentrically, and in a space between the cylindrical form and a cylindrical wall arranged in parallel inside the cylindrical form. A feed pipe for pressure-feeding fresh concrete into the cylindrical form is inserted into the space, and an injection port opened at the upper end of the inner frame cylinder and an injection port opened at the upper end of the inner frame cylinder are inserted into the space. 1. A concrete pipe propulsion forming device, characterized in that a flow path switching member that is driven and controlled is installed to selectively communicate with a discharge port opened at an upper end.