JPH08105205A - Concrete placing device - Google Patents

Abstract

PURPOSE: To maintain such a state that fresh flowing-concrete is filled up to the lower end of a placing pipe. CONSTITUTION: An unenergized part 3 is attached to a placing pipe 2 connected to a guide pipe 1. This unenergized part 3 consists of a first down pipe 11 connected to this placing pipe 2, a second down pipe 12 connected to a flexible pipe 4, and a riser pipe 13 connected to these first and second down pipes 11 and 12 through two connecting pipes 14 and 15. In this constitution, fresh flowing-concrete dropping down via the guide pipe 1 and the placing pipe 2 like is once lifted up by the riser pipe 13 and then it is made to stay there for a while, thereby being forced into a state that it is filled up to a range from top to bottom of the placing pipe 2. In consequence, since the fresh flowing concrete is not freely dropped down inside the placing pipe 2, aggregate consisting of those materials of cement and mortar is not disintegrated al all. Therefore, quality concrete can be placed in a deep shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete placing device used when placing fresh concrete deep underground.

[0002]

2. Description of the Related Art Conventionally, when pouring fresh concrete deep underground, a pouring pipe has been used so as not to scatter the raw concrete or separate the cement material or mortar material from the aggregate. There is.

[0003]

However, in the concrete placing method using the above-mentioned conventional placing pipe,
Although the scattering of green concrete can be prevented, the following problems occur. That is, when the ready-mixed concrete falls in the casting pipe, the falling speed becomes higher as it goes downward. Therefore, when supplying ready-mixed concrete to a sufficiently long casting pipe, even if it is supplied so that its cross section is full at the supply port, it will fall freely below, and eventually cement material, mortar material and aggregate material Because of the separation, it is impossible to place good quality concrete.

Therefore, a rubber tubular portion slightly thinner than the outer diameter of the casting pipe is formed in the middle of the casting pipe, and resistance is given to the fresh concrete falling by the tubular portion to adjust the falling speed. There is also a driving method. However, in this case, there is a problem that the rubber is broken by friction with the falling fresh concrete.

Further, generally, the above-mentioned casting pipes are used by being fixed to the wall surface of the vertical shaft. Therefore, when the area of the bottom of the vertical shaft is large, it is necessary to temporarily release the fixing of the above-mentioned casting pipe and move the driving pipe along the wall surface of the vertical shaft to fix it again, which is extremely convenient. There is a problem of being bad.

SUMMARY OF THE INVENTION An object of the present invention is to provide a concrete placing device which is easy to use while maintaining a state where the raw concrete is filled up to the lower end of the placing pipe to prevent free fall of the fresh concrete. .

[0007]

In order to achieve the above object, a concrete placing apparatus according to a first aspect of the present invention comprises a main pipe which is arranged in a vertical direction and into which fresh concrete is poured from an upper end, and a vertical pipe. And a lower end of the main pipe connected to the lower end of the main pipe by a connecting pipe to elevate the ready-mixed concrete that has descended in the main pipe, and a vertical pipe and the upper end of the pipe. It is characterized in that it is equipped with a descending pipe which is connected to the upper end of the ascending pipe by a connecting pipe and which again descends the ready-mixed concrete that has risen in the ascending pipe.

The invention according to claim 2 is characterized in that, in the concrete placing apparatus according to the invention according to claim 1, both ends of the ascending pipe are detachable from the respective connecting pipes.

According to a third aspect of the present invention, in the concrete placing apparatus according to the first aspect of the present invention, the ascending pipe includes an outer pipe and an inner pipe slidably inserted into the outer pipe. At the same time, it is characterized in that it is provided with an expansion / contraction means for expanding / contracting the ascending pipe by changing the relative positions of the both pipes in the axial direction.

Further, the invention according to claim 4 is the concrete placing apparatus according to any one of claims 1 to 3, wherein the main pipe has a suspending member suspended by a crane. It is characterized by doing.

Further, the invention according to claim 5 is the concrete placing apparatus according to any one of claims 1 to 4, wherein the upper end opening of the main pipe has flexibility. It is characterized in that the open end of a guide pipe into which fresh concrete is press-fitted by a pump car is connected.

[0012]

In the invention according to claim 1, when the fresh concrete is poured from the upper end of the main pipe arranged in the vertical direction,
The direction of the ready-mixed concrete that has descended in the main pipe is changed by the connecting pipe and rises in the ascending pipe. At that time, the speed of the fresh concrete rising in the ascending pipe is reduced by gravity, and the fresh concrete temporarily stays in the main pipe. Then, the ready-mixed concrete that has once risen is changed in direction by the connecting pipe and falls in the descending pipe toward the place where it is to be placed. In this way, the fresh concrete is temporarily retained in the main pipe, whereby the state where the fresh concrete is filled up to the lower end of the main pipe is maintained, and the fresh concrete descends in the main pipe without free fall.

In the invention according to claim 2, the length of the rising pipe can be changed according to the length of the main pipe by preparing pipes of various lengths as the rising pipe. Becomes Then, depending on the hardness of the fresh concrete and the length of the main pipe, the state where the fresh concrete is filled up to the upper end of the rising pipe is maintained.

Further, in the invention according to claim 3, the axial relative positions of the outer pipe and the inner pipe constituting the rising pipe are changed by the expansion / contraction means according to the length of the main pipe, and The length of the rising pipe is changed. In this way, the rising time in the fresh concrete is optimally adjusted, and the state where the fresh concrete is filled up to the lower end of the main pipe is maintained.

Further, in the invention according to claim 4, when moving the driving place, the crane suspending the main pipe is moved and the main pipe is moved together with the ascending pipe and the descending pipe. . In this way, highly concrete pouring is performed.

In the invention according to claim 5, green concrete is press-fitted into the upper end opening of the main pipe by a pump car through a guide pipe. Thus, it is prevented that a vacuum portion is generated in the main pipe due to the disproportion between the length of the main pipe and the length of the rising pipe, or that the length of the rising pipe is too long and the fresh concrete cannot rise by itself. , The state where the concrete is filled up to the lower end of the main pipe is always maintained.

[0017]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a concrete pouring device according to the present embodiment, and FIG. 2 is an explanatory diagram when pouring concrete into a vertical shaft by the concrete pouring device.

As shown in FIG. 2, the concrete placing apparatus in this embodiment has a flexible guide pipe 1 and a vertical shaft 5 connected to the guide pipe 1.
The casting pipe 2 as the main pipe inserted therein, the depressurizing portion 3 provided in the lower portion of the casting pipe 2, and the depressurizing portion 3
The flexible tube 4 is connected to the lower end of the. Then, the upper part of the placing pipe 2 is lifted by the crane vehicle 6, and the placing pipe 2, the depressurizing portion 3, and the flexible pipe 4 are suspended in the vertical shaft 5.

Incidentally, 7 is a concrete mixer truck,
8 is a pump car. The suspending means is not limited to the crane vehicle 6, and a crane that moves on an upright rail may be used.

As shown in FIG. 1, a lowering portion 3 which is a feature of the present invention is attached to the lower end of the placing pipe 2 in the concrete placing device. The depressurizing portion 3 has a first descending pipe 11 connected to the driving pipe 2, a second descending pipe 12 connected to the flexible pipe 4, and both ends of the first descending pipe 11 and the second descending pipe 11. It is composed of a rising pipe 13 connected to the descending pipe 12 by U-shaped connecting pipes 14 and 15. Then, the connection pipe 14 is placed on the pipe pedestal 16, the plate 17 is attached to the upper part of the first descending pipe 11, and the pipe pedestal 16 and the plate 17 respectively have one end of the suspension wires 18 and 19. While the other end is attached to the hanging member 20. Then, the suspension member 20 is suspended by the crane vehicle 6. In this way, the weight of the entire driving pipe 2, the damping portion 3 and the flexible pipe 4 is supported.

At this time, the suspension wires 18 and 19 are
Guide pipe 2 connected to the placing pipe 2 with connecting tools 25, 25, ...
1, 22 or guide tubes 23, 24 are inserted so that the hanging wires 18, 19 do not separate from the driving tube 2. The guide pipes 21, 22, 23 and 24 are not always necessary, and the placing pipe 2 follows the movement of the wires 18 and 19 when the hanging member 20 is moved by the crane vehicle 6. Just do it.

In this way, "ψ" is attached to the lower end of the casting pipe 2.
By providing the character-shaped energy-reducing portion 3, the raw concrete that has fallen in the casting pipe 2 is temporarily held in the rising pipe 13 by lowering the flow velocity. In this way, the fresh concrete is filled up to the upper end of the rising pipe 13 to prevent the fresh concrete from freely falling inside the casting pipe 2.

The stopper 26 is for stopping the flow of the ready-mixed concrete at the time of starting the concrete pouring or moving the pouring pipe 2. In this embodiment, when moving the concrete pouring place, the flow of fresh concrete is once stopped by the stopper 26, and then the hanging member 20 is horizontally moved by the crane vehicle 6. Thus, in addition to the placement pipe 2 being easily moved, by swinging the tip of the flexible pipe 4 connected to the lower end of the second descending pipe 12, even if the bottom area of the vertical shaft 5 is large. It is possible to place fresh concrete uniformly with good mobility.

The ready-mixed concrete poured into the casting pipe 2 does not fall freely due to the friction in the pipe when flowing in the casting pipe 2 and the weight of the fresh concrete in the rising pipe 13. When the length of the installation pipe 2 is long, it is necessary to adjust the weight of green concrete in the rising pipe 13 according to the length of the casting pipe 2. Therefore, in the present embodiment, the ascending pipe 13 of the damping unit 3 is connected to the pipe joints 27, 28.
While the detachable pipe is made detachable, the ascending pipe 13 having various lengths is prepared. In this way, by changing the length of the ascending pipe 13 to the optimum length according to the length of the casting pipe 2, free fall of green concrete is prevented regardless of the depth of the vertical shaft 5, and the cement is cemented. It is possible to place good quality concrete in which the aggregate and the mortar material and the aggregate are not separated.

As described above, by adjusting the length of the ascending pipe 13 to an optimum length according to the length of the casting pipe 2, it is possible to always fill the lower end of the casting pipe 2 with fresh concrete. However, if the length of the rising pipe 13 is less than the optimum length, a vacuum portion will be formed in the driving pipe 2. Further, when the length of the rising pipe 13 is too long, the ready-mixed concrete in the rising pipe 13 cannot be lifted by its own weight. However,
As shown in FIG. 2, the pump pipe 8 guides the guide pipe 1
By press-fitting the fresh concrete to the above, the above-mentioned vacuum part is prevented from occurring, and the fresh concrete rises up to the pipe 13
The inside can be surely raised.

Incidentally, in the above-mentioned embodiment, the energy-reducing portion 3
The rising pipe 13 of FIG. 1 is made detachable and can be replaced with the rising pipes 13 of various lengths.
The length of 3 is changed. However, the method of changing the length of the rising pipe 13 is not limited to this. FIG. 3 is an enlarged view of a rising pipe according to another embodiment. The rising pipe 31 in this embodiment is a double pipe, and the inner pipe 32 is slidably inserted in the outer pipe 33. Then, the length of the rising pipe 31 is changed by sliding the outer pipe 33 up and down by the jack 34 as the expanding and contracting means.

[0027]

As is clear from the above, the concrete pouring device of the invention according to claim 1 connects both lower ends of the main pipe and the rising pipe arranged in the vertical direction by the connecting pipes, while Since both upper ends of the ascending pipe and the descending pipe were connected by the connecting pipes, the ready-mixed concrete descending in the main pipe was once raised in the ascending pipe and then descended in the descending pipe again. It Therefore, the ready-mixed concrete that descends in the main pipe is temporarily stagnated due to the flow velocity decrease due to the weight of the ready-mixed concrete in the ascending pipe, and the state where the ready-mixed concrete is filled up to the lower end of the main pipe can be maintained.

That is, according to the present invention, it is possible to prevent the free fall of the green concrete in the main pipe, prevent the cement material or the mortar material from separating from the aggregate, and pour good quality concrete.

Further, in the concrete placing device of the invention according to claim 2, since the rising pipe is configured such that both ends thereof can be attached to and detached from the respective connecting pipes, a plurality of pipes having different lengths are used as the rising pipe. Once prepared, the length can be changed by exchanging the ascending pipe with any other of the above pipes. Therefore, the length of the ascending pipe can be optimally adjusted according to the length of the main pipe, and the state where the fresh concrete is filled up to the lower end of the main pipe can be maintained regardless of the depth of the shaft.

Further, in the concrete pouring device of the invention according to claim 3, the length of the rising pipe is changed by changing the axial relative positions of the outer pipe and the inner pipe constituting the rising pipe by the expanding and contracting means. Can be changed. Therefore, the length of the ascending pipe can be optimally adjusted according to the length of the main pipe, and the state where the fresh concrete is filled up to the lower end of the main pipe can be maintained regardless of the depth of the shaft.

Further, in the concrete placing device of the invention according to the fourth aspect, since the main pipe is provided with the suspending member suspended by the crane, the main pipe is moved together with the ascending pipe and the descending pipe by the crane. be able to. Therefore, even if the bottom area of the vertical shaft is large, the concrete pouring position can be easily moved, and a concrete pouring device which is easy to use can be realized.

Further, in the concrete pouring device of the invention according to claim 5, the open end of the guide pipe into which the fresh concrete is press-fitted by the pump car is connected to the upper end opening of the main pipe. When the length of the rising pipe is short with respect to the length, it is possible to prevent a vacuum portion from being generated in the main pipe. Furthermore, it is possible to prevent the ready-mixed concrete from being unable to rise due to its own weight due to the long length of the rising pipe.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the concrete pouring device of the present invention.

FIG. 2 is an explanatory view when pouring fresh concrete on a vertical shaft by the concrete pouring device shown in FIG.

FIG. 3 is a diagram showing another example of the rising pipe in FIG.

[Explanation of symbols]

1 ... Guide pipe, 2 ... Placing pipe, 3 ...
De-energizing part, 4 ... Flexible tube, 6 ... Mobile crane, 11 ... First descending pipe, 12
... Second descending pipe, 13,31 ... Ascending pipe, 14,15 ... Connecting pipe, 16 ... Pipe holder, 18,19 ... Suspending wire, 20 ... Suspending member, 26 ... Stopper, 27,28 ...
Pipe joint, 32 ... Inner pipe, 3
3 ... Outer pipe.

Claims (5)

[Claims] 1. A main pipe which is arranged in a vertical direction and into which fresh concrete is poured from an upper end, and a main pipe which is arranged in a vertical direction and whose lower end is connected to a lower end of the main pipe by a connecting pipe, The rising pipe that raises the ready-mixed concrete that has descended in the main pipe is arranged vertically, and the upper end of the rising pipe is connected to the upper end of the rising pipe by a connecting pipe. A concrete pouring device having a descending pipe for descending. 2. The concrete pouring device according to claim 1, wherein both ends of the ascending pipe are detachable from the connecting pipes. 3. The concrete pouring device according to claim 1, wherein the rising pipe includes an outer pipe and an inner pipe slidably inserted into the outer pipe, and the outer pipe and the inner pipe. A concrete pouring device comprising expansion and contraction means for expanding and contracting the ascending pipe by changing the relative position in the axial directions of and. 4. The concrete placing device according to any one of claims 1 to 3, wherein the main pipe has a suspending member suspended by a crane. Placing equipment. 5. The concrete pouring device according to claim 1, wherein the concrete pipe is press-fitted into the upper end opening of the main pipe by a pump car with flexibility. A concrete placing device characterized in that the open ends of the guide pipes are connected.