JPH0338086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steel pipe mortar lining device.

[Conventional technology and its problems]

Steel pipes whose inner surfaces are lined with mortar are commonly used as steel pipes for water pipes, seawater transport pipes, etc., which require corrosion resistance and prevention of reduction in flow coefficient.

To obtain this mortar-lined steel pipe, the conventional method is to tilt the steel pipe, pour mortar into it from one end using a bucket, and then rotate the steel pipe around a horizontal axis using turning rollers. The method used was to rotate the steel pipe around its horizontal axis while allowing mortar to flow down into the steel pipe using a conveyor belt.

However, these methods simply store mortar at the inner bottom of the steel pipe and distribute it around the entire circumference by the rotation of the steel pipe, so even if an expert pours it carefully and uniformly, A large thickness deviation occurs in the lining distribution in the direction, and unevenness tends to occur on the finished surface, making it unavoidable that the accuracy of the lining layer decreases. In particular, the latter belt conveyor feeding method allows mechanical feeding compared to the former, but because it uses a belt conveyor that is larger in size and weight, in the case of long steel pipes such as 12 m long, the lining for the pipes is half the length of each pipe. This resulted in batch operations, and there was a problem in that large steps and uneven thickness tended to occur at the joints between the ends of the left and right lining layers.

Furthermore, with the above method, uneven thickness often occurs, so in order to secure the minimum necessary lining thickness, it is necessary to use the amount of mortar that can obtain the maximum thickness, which unnecessarily increases the amount of material used. I was at a disadvantage.

In addition, since mortar is stored at the bottom of the pipe and spread around the entire circumference simply by the rotation of the steel pipe, it takes a long time for the lining to harden to the required thickness, resulting in poor efficiency. In particular, in the latter case, since a belt conveyor with a large width is inserted into a rotating steel pipe, troubles such as deflection or deflection that come into contact with the inner surface of the pipe are likely to occur.To avoid this, the rotation speed of the steel pipe should be slowed down. In the case of long steel pipes, the lining work is done for two minutes as mentioned above, so after lining half the length, the steel pipe's rotation is stopped, and the steel pipe is reversed 180 degrees to restart its rotation and feeding. This was especially true because of the process involved.

1974 Special Publication as a concrete injection device for manufacturing concrete piles and concrete poles
There is a publication No. 7277, which uses an injection tube with a built-in vane conveyor and a hole at the tip of the tube, and this injection tube is fitted into a guide tube and inserted into the formwork. The structure was such that concrete was moved forward by a vane conveyor while the injection pipe was moved by a cart using a guide pipe as a guide, and poured from the tip hole of the injection pipe.
Therefore, the concrete is simply stored at the bottom of the formwork and spread around the entire circumference by the rotation of the formwork, resulting in the same problems as in the prior art.

As a steel pipe mortar lining device, special public service was established in 1977.
-43096 publication is known. This prior art is
The mortar spreader is equipped with a rotary nozzle at the tip of the guide tube that is inserted into the steel pipe, an electric motor that drives the rotary nozzle is installed at the rear of the nozzle, and a pantograph type support mechanism is installed on the motor casing. It was moved using a roller-type drive mechanism installed on the base floor outside.

Then, with the steel pipe stationary, the rollers are driven, the spreader is supported on the inner wall of the steel pipe by a pantograph type support mechanism, and the rotary nozzle is moved in the direction of the pipe axis to spread mortar on the inner wall of the pipe using centrifugal force. The spread mortar was leveled out by rotating the steel pipe.

However, with this prior art, mortar is spread while the steel pipe is stationary, and after the spreading process is completed, the steel pipe must be rotated to level it. It is inevitable that mortar will fall to the bottom, and since steel pipes are not perfectly circular and are usually curved in the axial direction, it is necessary to remove the mortar that has accumulated at the bottom by resisting gravity. However, it is extremely difficult or impossible to form a uniform lining layer with small thickness deviation using only centrifugal force when the steel pipe is uncircular and curved in the axial direction, and the rotational center of the pipe is misaligned. Ta.

Additionally, the prior art required a long guide tube;
Smooth movement is easily hindered by the bending of the steel pipe itself, and long mortar-lined steel pipes are difficult to manufacture, and because the pantograph-type support mechanism slides along the inner circumference of the steel pipe, mortar-lined steel pipes can only be used once. There was a problem that the lining layer could only be formed as thin as 0.5 mm.

[Means for solving problems]

The present invention has been devised to solve the above-mentioned problems, and its purpose is to efficiently manufacture long steel pipes with a small amount of mortar, and with good precision and less uneven thickness. An object of the present invention is to provide a device capable of applying mortar lining.

In order to achieve this object, the present invention provides a means for rotating a steel pipe to be lined, a movable trolley that can freely approach and retreat from the steel pipe, and a support mounted on the movable trolley so that it can move up and down and traverse freely. It consists of an arm that is supported and inserted into the steel pipe, a centrifugal spraying machine that is attached to the tip of the arm and loosely inserted into the steel pipe, and means for force-feeding mortar to the spraying machine, The centrifugal projection type spraying machine is connected between a driving hollow shaft whose rear end is connected to a mortar supply pipe passing through the arm via a universal joint, and an end plate connected to the front end of the driving hollow shaft. An impeller having a circumference divided into a plurality of sections, a cylindrical housing surrounding the outer periphery of a driving hollow shaft via a bearing, and a motor section provided between the cylindrical housing and the driving hollow shaft. It is.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

1 to 7 show an embodiment of the steel pipe mortar lining device according to the present invention, and 1 is a device for rotating the steel pipe A, which is similar to the known device.
A plurality of pairs of turning rollers 19, 19 that horizontally support the steel pipe A, and an arbitrary turning roller 1
9 and 19.

2 is a lining machine that is a feature of the present invention.
This lining machine 2 first starts with a rail 2 attached to a base 21 lower than the steel pipe rotation device 1.
A mobile cart 3 that moves in the pipe length direction along lines 2 and 22.
Specifically, a wheel 23 rolling on a rail,
By driving 23 with a variable speed motor 24, a desired moving speed can be obtained.

A support body 4 is mounted on the movable trolley 3 in the front area. This support body 4 is for supporting a holding arm of a spraying machine, which will be described later, and in the illustrated example, it is slidable in the width direction and height direction of the movable trolley 3.

The mechanism is arbitrary, but as an example, the third
As shown in the figure and FIG.
The skid 26 with erected is attached so that it can be moved horizontally,
A traverse drive mechanism 28 such as an electric screw jack is provided between the skid or vertical guide and the moving carriage 3.

Further, a holding cylinder 29 is arranged between the vertical guides 27, 27, and a pin 291 provided thereon is connected to the vertical guides 27, 27.
27 and extending back and forth from the vertical guides 27 and 27 are respectively supported by elevating drive mechanisms 30 and 31 such as electric screw jacks provided on the skid 26, The front and rear lifting drive mechanisms 30, 31 can be driven synchronously or independently. The independent drive makes it easy to finely adjust the angle of the spray machine 6 and wash it with water.

An arm 5 preferably made of a rectangular tube with its rear end is inserted and fixed into the holding tube 29, and the arm 5 extends toward the steel tube A, and has a short cylindrical centrifugal projection type at the tip. A spraying machine 6 is detachably connected. The arm 5 is made to have a moderately curved shape when it is alone, and to be horizontal when the spray machine 6 is operated. Note that the arm 5 may have a telescoping type or other telescoping structure as necessary.

The spraying machine 6, as shown in FIGS. 6 and 7,
A plurality of circumferences (four in the illustrated one) are formed between the driving hollow shaft 61 and the end plate 63 connected to the front end thereof.
a cylindrical housing 64 that surrounds the outer periphery of the drive hollow shaft 61 via a bearing;
The rear end of the drive hollow shaft 61 is connected to the mortar supply pipe 7 through a universal joint so as to be relatively rotatable, and the motor part 65 is connected to the guide hole of the housing. The fluid supply pipe 8 and the mortar supply pipe 7 are guided rearward through the arm 5, and the mortar supply pipe 7 is connected to a mortar pumping means 9 mounted on a maneuvering truck. It is connected.

The mortar feeding means 9 may be any means as long as it can continuously supply mortar of a desired composition to the spraying machine 6, but in the one shown, it includes a hopper 10 for storing mortar on the movable cart 3, and a hopper 10 for storing mortar on the movable cart 3. A discharge portion of the mortar pump 11 is connected to the mortar supply pipe 7 through a hose 12.

It is preferable to use a mortar pump 11 of a type with a variable discharge rate and low pulsation, such as a squeeze type or a snake tube type.In order to control the amount of mortar supplied in accordance with the mortar lining construction thickness, the hopper 10 is mounted on a mount 100. The arithmetic circuit 14 detects the remaining amount of mortar, the discharge amount, and, if necessary, the instantaneous discharge amount, and displays it digitally on the operation panel 15.
The drive of the mortar pump 11 is controlled.

Although the basic configuration has been described above, the present invention further includes a system in which an automatic operation control system is coupled to operate the mortar pump 11, the movable cart 3, and the spray machine 6 according to a fixed program.

FIG. 8 shows an example of this. Reference numeral 17 denotes a lining condition calculation unit, which is electrically connected to the controller 16 and is configured to calculate pipe length, pipe diameter, lining time, construction layer thickness, pump discharge amount per unit time, The moving speed and number of reciprocations of the movable cart 3 are calculated by inputting the machine discharge amount and the like from the setting device 18, and a signal is sent to the controller 16 to be stored.

The controller 16 includes a fluid supply control unit 66 for the continuously variable speed drive unit 110 of the mortar pump 11, the drive unit 24 of the movable trolley 3, and the motor unit of the spray machine 6.
For example, an electromagnetic flow regulating valve, and if necessary, the traverse drive mechanism 28 and the lifting drive mechanism 30, 31 of the support body 4.
Alternatively, they are further connected to the drive section of the steel pipe rotation device 1 via timers and relays, respectively.

In other drawings, 35 is a weight, 36 is a power supply reel, and 37 is an additive mixing section.

The method of using the present invention will be explained by taking the illustrated embodiment as an example.

The steel pipe A is arranged on the rotation device 1 and rotated by the variable speed drive mechanism 20. On the other hand, mortar mixed at a desired blending ratio and water/cement ratio is put into the hopper 10 of the movable trolley 3. Then, the pipe length, pipe diameter,
The lining time, construction layer thickness, pump discharge amount per unit time, spraying machine discharge amount, etc. are input from the setting device 18 to the lining condition calculating section 17.

This sets the traveling speed and number of reciprocations of the movable trolley 3, and operates the elevating drive mechanisms 30, 31 and the traversing drive mechanism 28 according to the pipe diameter. Lifting drive mechanism 3
0 and 31, the holding cylinder 29 will slide while holding the arm 5 using the elongated hole and the pin as a guide, and if the transverse drive mechanism 28 is activated, the holding cylinder 29
The skid on which is mounted slides in the width direction of the mobile cart 3 via a guide bar. As a result, the sprayer 6 can freely follow changes in the pipe diameter, and the center of the impeller is aligned with the pipe axis. Therefore, it is possible to mortar-line steel pipes from small diameters that are larger than the diameter of the spray machine to large diameter steel pipes with one device.

If automatic operation is selected, a working fluid such as air is sent to the motor section 65 of the sprayer 6 through the fluid supply pipe 8, and the impeller 62 is rotated by the driving hollow shaft 61. When a certain period of time has elapsed by the timer, the mortar pump 11 is operated, and at the same time, the variable speed motor 24 of the movable trolley 3 starts driving, and the spraying machine 6 reaches a predetermined position from the standby position, for example, the end position of the steel pipe A. The mobile cart 3 moves forward to this position, and from this position, the moving cart 3 continues to move forward.

As the movable trolley 3 moves forward, the spraying machine 6 supported at the tip of the arm 5 enters from the end of the rotating steel pipe A, enters from the mortar supply pipe 7 passing through the arm 5, passes through the driving hollow shaft 61, and then moves at high speed. Since the mortar is forced into the rotating impeller 62, the mortar is uniformly distributed and projected on the inner periphery of the steel pipe by centrifugal force, and a mortar lining layer is gradually formed in the lengthwise direction of the pipe. In this way, when the steel pipe A reaches one end, the variable speed motor 24 rotates in reverse, and the movable trolley 3 moves backward. At this time as well, mortar is projected by the sprayer 6 to increase and adjust the thickness of the lining layer B. During this time, the amount of mortar supplied is automatically detected by the load cell 13 and the arithmetic circuit 14, and the movable cart 3 is moved forward and backward a set number of times to correspond to the target lining thickness.

Once the desired lining thickness is reached in this way,
A stop signal is sent from the controller 16 to the mortar pump 11, and the operation is stopped. Next, the fluid supply is stopped, the rotation of the impeller 62 of the spray machine 6 is stopped, and then the movable trolley 3 is retreated to the standby position, and the spray machine 6 is extracted from the steel pipe A together with the arm 5.

This completes one cycle of lining, and after draining and hardening, the steel pipe A is removed from the rotation device 1.
It becomes a product by being wet-cured or steam-cured.

The characteristics of the steel pipe mortar lining according to the present invention are listed below.

It is possible to manufacture high-precision mortar-lined steel pipes with less uneven thickness, excellent strength, and adhesion.

The present invention does not apply mortar to the inner periphery of a reservoir in a rotating steel pipe, but instead rotates an impeller 62 inside the rotating steel pipe to forcefully distribute and project mortar evenly in the circumferential direction. It moves in the axial direction of the pipe, and therefore, appropriate leveling is performed by the synergistic effect of the centrifugal force caused by the rotation of the steel pipe and the centrifugal projection and axial movement of the mortar itself, and the mortar lining in the circumferential and longitudinal directions. There will be less variation in thickness.

The mortar is not simply flowed along the wall surface and adhered to the wall surface, but is sprayed onto the wall surface from a required angle with the pipe axis with strong pressure and adhered to the wall surface with an impact, which allows moisture to drain out easily and allows for close contact with the inner wall surface of the pipe. In addition, since there is no natural adhesion, it is possible to use hardened mortar. Therefore,
It has high strength, less sagging, and a better finished surface.

Mortar-lined steel pipes can be manufactured with high efficiency.

Instead of spreading mortar on the bottom of the steel pipe and moving it upward against gravity one by one to make it adhere to the wall,
Since the mortar is directly sprayed all over the inner surface of the steel pipe, the lining layer grows quickly, and the double centrifugal force as described above causes the mortar to harden very quickly.

Moreover, in the present invention, the arm 5, which is equipped with a centrifugal spraying device 6 at the tip, is supported by the support 4 mounted on the moving cart 3 and moved in the direction of the tube axis, so that the arm length is the same as the length of the steel tube. The spraying machine 6 also has a rear end connected to a drive hollow shaft 61 which is connected to the mortar supply pipe 7 passing through the arm through a universal joint, and a front end of the drive hollow shaft 61. an impeller 62 that divides its circumference into a plurality of sections between the impeller 62 and the end plate 63; a cylindrical housing 64 that surrounds the outer periphery of the drive hollow shaft 61 via a bearing;
This cylindrical housing 64 and the driving hollow shaft 61
Since the arm 5 is equipped with a motor section 65 provided in between, it is lightweight and compact, and the arm 5 can be moved up and down and horizontally by the support 4, so special means such as a guide tube or a pantograph type support mechanism are required. The mortar can be centrifugally projected while smoothly moving in a loosely inserted manner into the steel pipe without the need for the mortar. In other words, there is no fear of contact with the inner wall of the pipe, and the rotation speed of the steel pipe is not restricted.
It is possible to increase the speed to over 1000 rpm. Therefore, even if the steel pipe is long, such as 12 m or more, the entire length can be mortar-lined at once and quickly.

mortar-lined steel pipes can be manufactured at low cost.

In addition to shortening the curing time as described above, the difference between the maximum thickness and the minimum thickness can be reduced by reducing uneven thickness. Therefore, the amount of mortar required for lining can be significantly reduced, and the maintenance and repair work after curing can also be significantly reduced.

Mortar lining thickness can be freely controlled.

Since the present invention uses a method in which an impeller sprayer is moved within a steel pipe, if the discharge amount of the sprayer is kept constant, the lining thickness can be freely set by increasing or decreasing the number of reciprocations of the moving cart within a fixed time. In addition, by simply changing the discharge amount of the sprayer in the direction of the tube axis, the lining thickness can be made tapered or knotted, or only an arbitrary zone can be made locally unlined.

〔Effect of the invention〕

According to the present invention as described above, there is provided a means for rotating the steel pipe to be lined, a movable trolley that can freely approach and retreat from the steel pipe, and a rear portion supported by a support mounted on the movable trolley so that it can move up and down and traverse freely. It consists of an arm inserted into a steel pipe, a centrifugal spraying machine attached to the tip of the arm and loosely inserted into the steel pipe, and a means for force-feeding mortar to the spraying machine, and the centrifugal spraying machine A spraying machine of the type is connected to a driving hollow shaft 61 whose rear end is connected to the mortar supply pipe 7 passing through the arm through a universal joint, and an end plate 63 connected to the front end of the driving hollow shaft 61. an impeller 62 that divides the circumference into a plurality of parts between them; a cylindrical housing 64 that surrounds the outer periphery of the drive hollow shaft 61 via a bearing; and a motor section 65 provided between the cylindrical housing 64 and the drive hollow shaft 61. This allows the steel pipe to rotate on its own axis rather than stand still, and in this state, the centrifugal force spraying machine is kept from coming into contact with the steel pipe while distributing mortar onto the inner wall of the steel pipe using centrifugal force and projecting it in the circumferential direction. It is possible to smoothly reciprocate in the tube axis direction while gradually forming a uniform lining layer.
In particular, an excellent effect can be obtained in that a thick mortar lining layer with little thickness deviation can be formed on a long steel pipe with high efficiency and at low cost.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a steel pipe mortar lining device according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a plan view showing details of FIG. 1.
FIG. 4 is a partially cutaway side view of the same, FIG. 5 is a sectional view taken along the line of FIG. 4, FIG. 6 is a partially cutaway side view of the spraying machine according to the present invention, and FIG. Explanatory diagram showing half of the front and half of the back, No. 8
The figure is an explanatory diagram illustrating a control system used in the present invention. 1... Steel pipe rotation device, 2... Lining machine, 3... Moving trolley, 4... Support body, 5... Arm, 6... Spraying machine,
9... mortar pressure feeding means, 26... skid, 28...
Traverse drive mechanism, 30, 31... Lifting drive mechanism, 29
...Holding tube, 62... Impeller, A... Steel pipe.

Claims (1)

[Claims] 1. A means for rotating the steel pipe to be lined, a movable trolley that can approach and retreat from the steel pipe, and an arm that is inserted into the steel pipe and whose rear part is supported by a support mounted on the movable trolley so that it can move up and down and traverse freely. , a centrifugal projection type spraying machine attached to the tip of the arm and loosely inserted into the steel pipe, and a means for force-feeding mortar to this spraying machine, the centrifugal projection type spraying machine comprising: A driving hollow shaft 61 whose rear end is connected to the mortar supply pipe 7 passing through the arm via a universal joint, and an end plate 63 connected to the front end of the driving hollow shaft 61 have a plurality of circumferences. The partitioning impeller 62 and the driving hollow shaft 61
A cylindrical housing 64 that surrounds the outer periphery of the housing via a bearing.
and a motor section 65 provided between the cylindrical housing 64 and the drive hollow shaft 61.