JPH0435590B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a concrete pouring device using a tower crane used in high-rise buildings.

<Prior art> In conventional concrete placing work using a concrete pressure pump, concrete is pumped through a cast iron pipe from the pump to the vicinity of the pouring position, and at the end near the pouring position, a flexible rubber pipe or the like is connected to the cast iron pipe. A concrete hose was connected to the pipe, the pipe opening was moved manually, and concrete was poured.

However, this conventional pouring work requires replacing the hose when the pouring work is over a wide area, and the work efficiency is significantly lower, especially when the amount of pouring is small and wide area is being poured. This was the cause of the decline.

In response to this, an apparatus for automatically distributing concrete to a concrete pouring site has been developed, as shown in Japanese Patent Publication No. 52-14531, for example.

This device has a structure in which a horizontal support boom is supported on an erected structure extending in the vertical direction so as to be able to swing automatically around a vertical axis, and a concrete pressure pipe is installed on the support boom. Ready-mixed concrete can be supplied within the swing range of the support boom.

<Problems to be Solved by the Invention> However, with this structure, the concrete transfer pipe is configured to be flexible via a rotary joint, so the resistance at this joint is large and a large pressure loss is likely to occur. It was.

In other words, when constructing a skyscraper, the lift from a concrete pressure pipe installed on the ground or in the middle of the floor inevitably increases, so this type of pressure loss becomes too large to ignore.

On the other hand, when a flexible concrete hose such as a rubber hose is used, the problem is that it loosens when held under the boom, resulting in a large pressure loss.

This invention was made based on the above background, and aims to reduce flow path resistance, which is a problem when pouring concrete with a flexible concrete hose using a tower crane, and to quickly cast concrete over a wide area. The purpose is to be able to move and supply concrete.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention provides a trolley which holds the discharge end side of a concrete hose so as to be movable up and down, and which is movable along the horizontal boom; a pulley supported so as to be able to run along a weight beam provided on the opposite side of the trolley and around which the intermediate portion of the hose is suspended; and a hose tensioned along the boom depending on the running position of the trolley. The present invention is characterized by comprising a balance weight for removing slack to move the pulley as much as possible.

<<Operation>> Concrete can be placed at any position within the swing range of the horizontal boom by moving the swing trolley of the horizontal boom of the tower crane and raising and lowering the hose. In addition, since the concrete hose is always maintained in a tensioned state regardless of the movement of the trolley, there is little flow path resistance due to slack etc. Therefore, even if the concrete lifting height is large and the casting area is wide, concrete can be transported well.

<<Example>> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a side view showing the overall configuration of a tower crane equipped with a concrete placing device of the present invention.

The tower crane in the figure is equipped with a horizontal boom 2 pivotably disposed on the top of a self-climbing post 1, and a weight beam 3 for balancing gravity with the boom 2 at a position opposite to the horizontal boom 2. A trolley 4 is supported at the bottom of the horizontal boom 2 and is movable along its longitudinal direction. An elevating arm 5 is arranged at the bottom of the trolley 4, and the trolley 4
A hose feeding device 6 is integrally provided on the side of the
The distal end of a concrete hose 7 is supported by this feeding device 6, and while it is held by a plurality of brackets 8 provided on the side of the elevating arm 5, it is attached to a distributor 9 provided at the lower end of the elevating arm 5. Connected.

On the other hand, on the side of the weight beam 3, an elevating drive device 10 for the elevating arm 5 is disposed, and on the lower side of the elevating arm 5, an elevating drive device 10 is disposed, which is movable along the longitudinal direction of the weight beam 3, and the concrete hose 7 is movable on the lower side thereof. A pulley 11 for tensioning around which the middle part is suspended
is provided. The supply end side of the hose 7 is connected to the ground side from the lower part of the pulley 11 through the center of the post 1, and is connected to the concrete pressure pump 13 provided on the ground side, and is connected to the concrete hopper 1.
The fresh concrete in 4 is supplied to the concrete hose 7 side through this pressure pump 13, and is fed to the distributor 9 provided at the tip of the lifting arm 5.
More is discharged.

2 and 3 are diagrams showing the trolley 4 and the coupling relationship between the trolley 4 and the boom 2. FIG.

The boom 2 has a truss structure with a triangular cross section, and has guide rails 15 at both lower edges thereof. A plurality of pairs of guide rollers 16 are provided inside the left and right upper portions of the trolley 4 corresponding to the guide rails 15, respectively, and roll along the upper and lower sides of the guide rails 15.
is provided and supported in a suspended state on the lower edge of the boom 2.

A rack gear 17 is provided on the outer side of each guide rail 15, and a pair of pinions 18, which are supported within the trolley 4, mesh with the side surfaces of each rack gear 17. One pinion 18 is connected to a drive motor 19 for traveling the trolley 4, and the other pinion 18 is connected to a drive motor 19 for traveling the trolley 4.
It is linked to a travel detection device 20 arranged on the upper surface of the other side.

Therefore, the trolley 4 can travel from the base to the tip of the boom 2 by driving the motor 19, and its position is detected by the travel detection device 20.

Further, a guide shaped beam 21 is fixed to the center of the lower surface of the horizontal boom 2 along the longitudinal direction. A plurality of hose trolleys 22 are suspended from this I-shaped beam via guide rollers 23. A support roller 24 that supports the concrete hose 7 is provided at the bottom of the hose trolley 22.
is located. A large number of hose trolleys 22 are arranged on the rear side of the trolley 4,
By suspending and supporting parts of the hose 7, the entire hose 7 is prevented from loosening.

Next, FIGS. 4a and 4b show a more detailed arrangement of the trolley 4 and the lifting arm 5.

In the figure, the elevating arm 5 has a rectangular cross section, and has an intermediate cylinder 26 and an inner cylinder 27 disposed at the tip of a fixed cylinder 25 fixed to the lower end of the trolley 4 so as to be retractable. A pair of pulleys 28 are arranged at the inner bottom of the inner cylinder 27. A wire 30 for telescopic operation, which is suspended from a plurality of pairs of pulleys 29 (see FIGS. 2 and 3) provided on the trolley 4, is supplied to each pulley 28.
The intermediate cylinder 26 and the inner cylinder 27 can be moved into and out of the fixed cylinder 25 by the zero winding and unwinding operations.

Further, this telescopic operation wire 30 is wound up and let out by the operation of the above-mentioned elevating and lowering drive device 10.

6 and 7 show the elevating drive device 10, which is located on the weight beam 3, and is connected to the wire 30 of the elevating arm 5.
a fixed pulley 31 that winds up the end of the fixed pulley 31;
A movable pulley 32 in which the end of the wire 30 is wound several times between the movable pulley 32 and a hydraulic cylinder 33 located on the side of the movable pulley 32 for moving the movable pulley 32 are provided. The tip of the plunger 34 of the hydraulic cylinder 33 is connected to the movable pulley 32.

In addition, each wire 3 is placed near the fixed pulley 31.
Equalizer 3 for balancing tension with respect to 0
5 is placed.

Therefore, the movable pulley 32 moves toward and away from the fixed pulley 31 in accordance with the hydraulic pressure adjustment of the hydraulic cylinder 33, and the wire 30 is wound up and let out accordingly, thereby performing the above-mentioned lifting and lowering fine adjustment work of the lifting arm 5. It is possible to do this.

Note that the lifting arm 5 includes the intermediate cylinder 26.
A support mechanism is also provided to allow the inner tube 27 to expand and contract evenly.

As shown in Fig. 5a and b, this means that the fixed cylinder 2
A fixing bracket 36 provided on the upper outer periphery of 5
A suspension wire 37 with one end suspended is connected to a pulley 38 provided at the upper end of the fixed cylinder 25 and the intermediate cylinder 2.
The inner cylinder 2
It is suspended from a hook part 40 provided on the upper part of 7.

Therefore, when the inner cylinder 27 is lowered by the hoisting and feeding operations of the lifting drive device 10, the intermediate cylinder 26 is also lowered by the same amount, and conversely, the inner cylinder 27 is lowered by the same amount.
When the intermediate cylinder 26 rises, the intermediate cylinder 26 also rises by the same amount, so that it can move in and out of the fixed cylinder 25 just the right amount.

Next, the detailed structure of the above-mentioned hose feeding device 6 will be explained using FIG. 8 and FIG. 9.

In the figure, the feeding device 6 has guide rollers 4 at the top that roll along both sides of the I-shaped beam 21.
A pair of frames 42 provided with 1 and a frame 42
a pair of drive rollers 43 and 44 that sandwich the supplied concrete hose 7; a plurality of pairs of guide rollers 45 that guide the concrete hose 7 in a 90° bent state; and each of the drive rollers 4
A motor 47 for rotationally driving the parts 3 and 44 is provided.

The pinion 48 of the motor 47 is connected to a gear 49 provided coaxially with each drive roller 43, 44.
50 to transmit the rotational power of the motor 47 to each of the drive rollers 43 and 44.

Therefore, the hose 7 is lowered or raised by the forward and reverse rotation of the motor 47. Note that this operation is performed in synchronization with the expansion and contraction state of the elevating arm 5.

Next, the detailed structure of the distributor 9 installed at the tip of the concrete hose 7 is shown in FIGS.
This will be explained using Figure 1.

In the figure, the distributor 9 includes a housing 51 fixed to the lower end of the inner cylinder 27,
A swivel joint 52 is provided at the tip of the concrete hose 7 on one side of the housing 51.
A substantially L-shaped discharge nozzle 53 is connected to the projecting nozzle 53 for relative rotation through the housing 51, and a motor 54 is provided within the housing 51 for driving the projecting nozzle 53 to an appropriate rotation position.

A fan-shaped guide 55 is provided at the bottom of the housing 51, and this guide 55 has a pair of guide rollers 5 provided above the discharge nozzle 53.
6 are connected, and a rack 57 provided at the center of the guide roller 56 is meshed with a pinion 58 provided on the output shaft of the motor 54.

Therefore, the discharge nozzle 53 can direct its discharge tip with a degree of freedom corresponding to the fan-shaped turning angle at the concrete placement position.

Next, the configuration of the weight beam 3 side of the hose 7 will be explained using FIGS. 12 to 14.

In the figure, the middle part of the hose 7 is the aforementioned pulley 11.
is suspended. This pulley 11 is connected to a hose pulley trolley 60 that is suspended so as to be able to run along an I-shaped beam 59 provided at the upper center of the weight beam 3.
It is rotatably supported by the hose 7, and is suspended so that the discharge side of the hose 7 is at the top and the supply side continuous to the ground side is at the bottom.

At the rear end of the hose pulley trolley 60,
A wire 61 for tensioning the hose 7 is connected, and this wire 61 is pulled out to the front side again through a fixed pulley 62 provided at the rear end of the weight beam 3, for example, as shown in FIG. By suspending a balance weight 63 from the lower part of the wire 61, the pulley 11 is always urged toward the backward direction.

Therefore, the concrete hose 7 moves forward and backward depending on the position of the trolley 4, and the concrete hose 7 is always kept under constant tension.

The stroke that the hose pulley 11 can move is set to 1/2 of the travel stroke of the trolley 4 running along the horizontal boom 2.
The extra length of the concrete hose 7 that occurs due to the movement of the hose pulley 11 is absorbed by the movement of the hose pulley 11.

According to the concrete placing device configured as above,
The rotating position of the boom 2, the traveling position of the trolley 4 with respect to the boom 2 (X direction in Fig. 1), and the lifting arm 5
By controlling the lifting position (Y direction in Figure 1) of the distributor 9 and the turning position (Z direction in Figure 1) of the distributor 9, concrete can be poured quickly and accurately at the target position. This is possible.

Moreover, if each of the above parts is detachably attached to a tower crane, it can be used as a concrete pouring device after materials are carried in by the tower crane.

<<Effects>> As described in detail in the examples above, in the present invention, there is no slack at all when a flexible hose is used as the concrete supply method, so there is no pressure drop during concrete transportation.

Therefore, the present invention allows concrete to be efficiently supplied to the intended pouring location when constructing a skyscraper.

Furthermore, according to the present invention, an existing tower crane can be used to equip the concrete placing device, so there is no particular need for a dedicated crane for automatically supplying concrete.

[Brief explanation of drawings]

FIG. 1 is a side view showing the overall configuration of a tower crane equipped with the concrete placing device of the present invention;
Figure 2 is an enlarged side view of the trolley part;
The figure is a sectional view taken along the line A-A in Figure 2, Figures 4a and 4b are side and front half sectional views showing the lifting arm, and Figures 5a and b are explanatory sectional views showing the uniform extension and contraction mechanism of the lifting arm. and a side view, FIG. 6 is a plan view showing the elevating and lowering drive device of the elevating arm, FIG. 7 is the same side view, and FIG.
The figure is a side view of the feeding device, Figure 9 is a front view of the same, and Figure 1 is a side view of the feeding device.
Figure 0 is a plan view showing the detailed structure of the distributor, Figure 11 is a cross-sectional view of the same side, Figure 12 is a side view showing the overall configuration on the weight beam side, and Figure 13 is a concrete hose winding pulley. FIG. 14 is a side view showing the portion, and a sectional view taken along the line B--B in FIG. 13. 1... Post, 2... Horizontal boom, 3... Weight beam, 4... Trolley, 5... Lifting arm,
6... Hose feeding device, 7... Concrete hose, 9... Distributor, 11... Pulley,
13...Concrete pressure pump, 63...Balance weight.

Claims (1)

[Claims] 1. Concrete pouring in which a concrete hose is held by a horizontal boom rotatably placed on the post of a tower crane, and concrete is discharged toward the pouring position through a distributor installed at the tip of the concrete hose. The concrete placing device holds the discharge end side of a concrete hose so as to be able to rise and fall, and also includes a trolley that can run along the horizontal boom and a weight beam provided on the opposite side of the horizontal boom. a pulley that is supported so as to be able to run along the boom and around which the intermediate portion of the hose is suspended; and a slack-removal device that moves the pulley to tension the hose along the boom depending on the running position of the trolley. A concrete placing device characterized by comprising a balance weight.