JPH08218636A - Block releasing device in concrete placing pipe and block release method in concrete placing pipe - Google Patents

Abstract

PURPOSE: To provide a block releasing device including a chuck device and a shock receiving arm which are carried on a frame for suspending a concrete placing pipe that is dropped by opening the chuck device so as to receive a shock in order to efficiently remove blocking in the pipe. CONSTITUTION: A concrete placing pipe 20 is clamped by chucks 40, 41 coupled to a pair of stoppers 50, 51 which are arranged to be horizontally slidable by means of a link mechanism and a rack and pinion mechanism or a cam mechanism, and is suspended. In order to remove blocking of concrete in the pipe 20, the chucks 40, 41 are opened by manipulating a slide actuating part 53 so as to drop the suspended pipe 20 under the deadweight thereof. Then, a sling 21 provide to the pipe 20 impinges upon a shock receiving part 311 of a shock receiving arm 31 set on a suspended frame 30 so as to apply a shock to the pipe 2. Accordingly, the shock applied to the pipe 2 held in a planted condition allow the concrete in the pipe 2 to be released from the blocking condition. Thereby it is possible to efficiently place concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blockage releasing device in a concrete casting pipe and a blockage releasing method in a concrete casting pipe for releasing blockage in a tremie pipe (hereinafter referred to as "placing pipe").

[0002]

2. Description of the Related Art When constructing a continuous underground wall or cast-in-place pile, concrete is placed using a placing pipe. When concrete is clogged in the casting pipe, the casting pipe is moved up and down by about 0.5 to 3.0 m in a suspended state to release the clogging. When clogging cannot be cleared by this method, the casting pipe is pulled up once to clear the clogging on the ground.

[0003]

Problems to be Solved by the Invention The above-mentioned method for clearing the blockage of concrete has the following problems. <A> It is often the case that the blockage of concrete cannot be cleared simply by moving the casting pipe up and down. <B> When the casting pipe is moved up and down, the liquid level of the concrete cannot be clearly grasped. Therefore, if the lower end of the casting pipe is accidentally pulled out above the top of the concrete, the water blocking property of the concrete structure may deteriorate. A cold joint is formed. <C> If the casting pipe is repeatedly moved up and down, slime is likely to be generated at the top of the concrete due to the kneading with the stabilizer.
The slime generated at the top of the concrete adheres to the reinforcing material such as the rebar cage to form a water channel, which is one of the causes of a decrease in the water stoppage of the concrete structure. <D> In the method of lifting the casting pipe to the ground to clear the blockage, concrete is placed with a time lag. for that reason,
There is a difference in hardening between the concrete poured earlier,
Cold joints are formed by depositing poor quality concrete or slime located on the top of the concrete that was cast earlier.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to avoid the deterioration of the quality of a concrete structure and simply and reliably eliminate the clogging of concrete. It is to provide a technique for releasing blockage in a concrete placing pipe.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a device for releasing closed concrete in a concrete placing pipe, and a suspending platform which is hung up and down by a crane. It is characterized by comprising chuck means capable of holding and releasing the head of the pipe, and a receiving arm which is provided below the suspension frame and which gives an impact force by colliding with the head of the falling casting pipe. It is a blockage release device in a concrete pouring pipe. Further, in the above-mentioned device, a pair of sandwiching members that are rotatably mounted on a horizontal axis and a pair of stoppers that are horizontally slidably arranged on the upper surface of each sandwiching member are provided on the suspension frame as chucking means. The blockage release device in the concrete pouring pipe. Further, in the above-mentioned device, the blockage releasing device in the concrete placing pipe is characterized in that it is configured to be horizontally slidable via a link mechanism between the pair of stoppers. Further, in the above-mentioned device, the blockage releasing device in the concrete pouring pipe is characterized in that it is horizontally slidable via a rack and pinion mechanism between a pair of stoppers. Further, in the above-mentioned device, the blockage releasing device in the concrete placing pipe is characterized in that it is horizontally slidable via a cam mechanism between the pair of stoppers. In a device for releasing closed concrete in a concrete placing pipe, a suspension platform that is hung up and down freely by a crane and a pair that is equipped on the suspension platform and that can clamp and release the head of the placing pipe by horizontal slide. Concrete placing, which comprises chucking means composed of a holding body and a receiving arm which is provided below the suspension frame and which gives an impact force by colliding with the head of a falling casting pipe. It is a device for releasing blockage in a pipe. In the above-mentioned device,
It is a blockage releasing device in a concrete pouring pipe, characterized in that a pair of holding bodies are horizontally slidable via a link mechanism. Further, in the above-described device, the blockage releasing device in the concrete pouring pipe is characterized in that the pair of holding bodies are horizontally slidable via a rack and pinion mechanism. In addition, in the above-mentioned device, the blockage releasing device in the concrete pouring pipe is characterized in that the pair of holding bodies are configured to be horizontally slidable via a cam mechanism. In the method for releasing blockage in a concrete placing pipe, any one of the above-mentioned blockage releasing devices is used, the blockage releasing device is lowered to the upper part of the placing pipe, and the placing pipe is clamped by a chuck means to release the blockage. The head of the placing pipe is pulled up by a crane while being clamped by the chuck means of the device, the chuck means is released, the placing pipe is dropped by its own weight, and the impact is imparted by colliding with the striker arm. A method for releasing blockage in a concrete placing pipe.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. <B> Closure release device FIG. 1 shows a side view of the blockage release device 10, and FIG. 2 shows an explanatory view thereof. The blockage release device 10 is a device for applying an impact to the driving pipe 20, and includes a suspension base 30 suspended by a crane (not shown) and a head of the mounting pipe 20 mounted on the suspension base 30. Chuck means for releasably clamping and suspension stand 30
And a receiving arm 31 that extends downward and impacts the head of the driving pipe 20 as a basic component.

<B> Suspension pedestal As shown in FIG. 1, the suspension pedestal 30 includes a frame body 3 in two upper and lower stages.
2 and 33, the upper frame 32 is a suspension member 3 such as a wire.
It is hung from a crane or the like (not shown) via 4.
At this time, the connecting portion of the upper frame 32 with the crane,
Any known connection can be used.

<C> Receiving Arm As shown in FIGS. 1 and 2, the lower frame 33 of the suspension frame 30.
In order to prevent the head of the driving pipe 20 from passing through and to apply an impact force to the head of the driving pipe 20 that has fallen, the receiving arm 31 faces downward. It has been extended. At the lower end of the receiving arm 31, a receiving portion 311 is formed which collides when the driving pipe 20 falls by its own weight. At this time, the receiving unit 311
Has a size such that the head, which is the large-diameter portion of the driving pipe, is inserted, but the hanging jig 21 attached to the head of the driving pipe 20 is not inserted.

<D> Chuck Means As shown in FIGS. 2 to 4, the clamping bodies 40 and 41 which are the chucking means for clamping and releasing the driving pipe 20 have horizontal shafts on the lower frame 33 of the suspension frame 30. Is rotatably attached to the center, and is provided with a holding portion 401 for holding the driving pipe 20.
411. Since the pair of holding bodies 40, 41 restrain the rotation of the driving pipe 20 due to its own weight when the driving pipe 20 is clamped, the pair of horizontal slide bodies 50, 51 as stopper means are located at the respective rear ends. To do. Horizontal slide body 5
Spring members 52 and 52 are interposed between the ends of the clamp members 40 and 41 so as to urge the clamp members 40 and 41 in the direction in which the rotation of the clamp members 40 and 41 is restricted. At one end of the horizontal slide body 50, a slide operation portion 53 is axially attached to the support member 35 of the suspension frame 30, and a horizontal movement force is applied to the horizontal slide body 50 by this operation.

A pair of transmission bodies 54, 54 are connected to both ends of the horizontal slide body 50, and extend in the direction opposite to the operating portion 53. The open ends of the transmission bodies 54, 54 are rotatably attached to the respective one ends of the plates 551, 551 of the link part 55. Plate 5 of link part 55
The central portions 51 and 551 are pivotally mounted so as to be rotatable about fixing pins 552 and 552 fixed to the suspension frame 30 at their central portions. Further, the open ends of the plates 551 and 551 are superposed on each other and pivotally attached to the end of the transmission body 56 so as to be rotatable. The transmission body 56 has a horizontal slide body 5 at the other end.
It is connected to 1.

<E> Operation of Chuck Means The case where the clamping of the driving pipe 20 is released will be described with reference to FIGS. First, in order to release the holding bodies 40, 41 holding the driving pipe 20, the horizontal slide bodies 50, 51 of the chuck means are slid. Horizontal slide body 5
The slides 0 and 51 slide the connecting horizontal slide body 50 in a direction to release the restraint of the rotation of the holding body 40 by rotating the operating portion 53 connected to the horizontal slide body 50. Then, the transmission bodies 54, 54 extended from the horizontal slide body 50 also slide in the same direction at the same time, and the plates 551, 551 of the link portion 55 are rotated. The plates 551 and 551 of the link part 55 are fixed pins 55.
Since it rotates about 2,552, the transmission body 56 connected to the overlapping portion is pushed out in the direction opposite to the transmission bodies 54,54. Since the transmission body 56 is connected to the horizontal slide body 51, the horizontal slide body 51 also slides in the direction in which the constraint of the rotation of the holding body 41 is released. By the above operation, the restraint of the sandwiching bodies 40 and 41 can be released, and the driving pipe 20 can be dropped. The placing pipe 20 can be restrained by performing an operation opposite to the above-mentioned operation.

<F> Mechanism in place of link part In addition to the chuck means adopting the link part as described above, it is also conceivable to adopt an indexing mechanism by a combination of a rope and a sheave. In this case, as shown in FIG. 5, the horizontal slide body 50 and the horizontal slide body 51 are connected to each other by a plurality of sheaves 6.
0, 60 and ropes 61, 61 are connected. That is, the sheaves 60, 6 in which the ropes 61, 61 extending from both ends of the horizontal slide body 50 are attached to one side of the suspension frame at the opposite position.
0 is connected to the horizontal slide body 51 via each. Accordingly, the rope 62 connected to the other end of the horizontal slide body 51 is pulled through the sheave 63, so that each horizontal slide body 5
It is possible to slide 0, 51 in the direction of releasing the rotation of the pair of holding bodies. The slide of the holding body in the direction of restraining the rotation is performed by the spring members 52, 52 mounted between the horizontal slide bodies 50, 51.

[0013]

Next, the method for releasing the blockage of the driving pipe of the present invention will be described. <A> Set of blockage releasing device When placing the concrete by placing the lower end of the casting pipe 20 lower than the top of the cast concrete, blockage occurs in the casting pipe 20. If the concrete is placed, suspend the concrete placing work, attach the hanging jig 21 to the placing pipe 20 which is still built in the groove hole, etc., and lower the blockage releasing device 10 suspended from above with a crane or the like. To install.

<B> Lifting of the placing pipe The head of the placing pipe 20 to which the hanging jig 21 is attached by the pair of holding bodies 40 and 41 axially attached to the suspension frame 30 which constitutes the blockage releasing device 10. By clamping the vicinity and restraining the rotation of the sandwiching bodies 40, 41 by the horizontal slide bodies 50, 51 which are stopper means, the closing pipe 10 and the casting pipe 2 together with a crane or the like.
Raise 0. At this time, the driving pipe 20 is pulled up to a height of about 0.5 m to 1.5 m from its original position.

<C> Applying Impact to the Placing Pipe When the placing pipe 20 is pulled up to the above-mentioned height, the rotation restraint of the holding bodies 40 and 41 by the stopper means is released. To release the restraint of the holding bodies 40 and 41 by the stopper means, the horizontal slide body 50 is slid in the releasing direction by pulling up and rotating the operating portion 53 connected to the horizontal slide body 50. The link bodies 55 at the ends of the transfer bodies 54, 54 that have received this movement cause the other horizontal slide body 51 to slide in the release direction to release the restraint of the holding bodies 40, 41.

The holding bodies 40, 41 released from the restraint by the stopper means rotate due to the weight of the driving pipe 20 and release the holding of the driving pipe 20. As a result, the casting pipe 20
Falls and collides with a receiving arm 31 extending below the suspension frame 30. The impact force generated by this collision is the driving pipe 2
It is transmitted to the concrete block that blocks the inside of 0.
As described above, the pulling up of the casting pipe 20 is repeated several times to give an impact force to the casting pipe 20, and the clogging of the concrete that has blocked the inside of the casting pipe 20 is efficiently eliminated. When the blockage of the casting pipe 20 is released, the blockage release device 10 is removed with the casting pipe 20 still installed, and the concrete placing work is restarted.

[0017]

[Embodiment 2] In the above embodiment, the case where the pair of sandwiching members are rotatably supported has been described, but the pair of sandwiching members may be horizontally slidable. In this embodiment, in order to horizontally slide the pair of holding bodies, for example, a link mechanism 70 (FIG. 6), a rack and pinion mechanism 80 (FIG. 7), a cam mechanism 90 (FIG. 8), etc. may be adopted. . That is, when one of the holding bodies 42 is released or pulled in the holding direction of the driving pipe and slid, the above-mentioned respective mechanisms cause
The other holding body 43 can also be provided with a sliding function of releasing the driving pipe or moving in the holding direction. In this case as well, since the holding body also functions as a stopper, the stopper means for the holding body, such as the horizontal slide body disclosed in the above-described embodiment, is not necessary.

[0018]

Since the present invention is as described above, the following effects can be obtained. <B> Since the striking force can be directly applied to the casting pipe, the concrete clogged in the casting pipe can be efficiently removed. <B> Impact can be applied to the casting pipe with the casting pipe still installed. Therefore, it is not necessary to pull the striking pipe to the ground and wind it up as in the conventional case, and it is possible to avoid the problem of the cold joint of the final concrete structure and the problem of deterioration of water stopping performance. <C> Since the blockage releasing device can be lifted using a crane or the like on site, the configuration of the blockage releasing device is simple.

[Brief description of drawings]

FIG. 1 is a side view of a blockage releasing device according to a first embodiment.

FIG. 2 is an explanatory diagram of a blockage releasing device according to the first embodiment.

FIG. 3 is an exploded view of the stopper means

FIG. 4 is an operation diagram of a link portion of the blockage releasing device.

FIG. 5 is an explanatory view of a stopper using a sheave.

FIG. 6 is an explanatory diagram of another embodiment employing a link mechanism.

FIG. 7 is an explanatory diagram of another embodiment employing a rack and pinion mechanism.

FIG. 8 is an explanatory diagram of another embodiment employing a cam mechanism.

Claims (10)

[Claims] 1. A device for releasing closed concrete in a concrete pouring pipe, wherein a suspension platform that is hung up and down freely by a crane and equipped on the suspension platform so that the head of the casting pipe can be clamped and released. A chucking means, and a striker arm that is provided below the suspension base and that gives a shock force by colliding with the head of the falling casting pipe. Release of blockage in the concrete casting pipe. apparatus. 2. The suspension frame according to claim 1, wherein a pair of sandwiching members rotatably mounted about a horizontal axis are provided as chucking means, and a pair of stoppers horizontally slidably arranged on the upper surface of each sandwiching body. It is equipped with
Blockage release device in concrete placing pipe. 3. The blockage releasing device in a concrete placing pipe according to claim 2, wherein the device is horizontally slidable between a pair of stoppers via a link mechanism. 4. A blockage releasing device in a concrete pouring pipe according to claim 2, wherein the device is horizontally slidable between a pair of stoppers via a rack and pinion mechanism. 5. The blockage releasing device in a concrete pouring pipe according to claim 2, wherein the device is horizontally slidable via a cam mechanism between a pair of stoppers. 6. A device for releasing closed concrete in a concrete pouring pipe, wherein a hanging platform that is vertically hung by a crane, and a head mounted on the hanging platform are clamped by a horizontal slide. And a chucking unit composed of a pair of releasable clamps, and a striker arm provided below the suspension base and giving an impact force by colliding with the head of the falling casting pipe. A device for removing blockages in concrete pouring pipes. 7. The blockage release device in a concrete pouring pipe according to claim 6, wherein the pair of holding bodies are horizontally slidable via a link mechanism. 8. The blockage releasing device in a concrete pouring pipe according to claim 6, wherein the pair of holding bodies are horizontally slidable via a rack and pinion mechanism. 9. The blockage releasing device in a concrete placing pipe according to claim 6, wherein the pair of sandwiching members are horizontally slidable via a cam mechanism. 10. A method for releasing blockage in a concrete casting pipe, wherein the blockage releasing device according to any one of claims 1 to 9 is used, and the blockage releasing device is lowered to an upper portion of the casting pipe, and is driven by a chuck means. The installation pipe is clamped, and the head of the casting pipe is pulled up by a crane while being clamped by the chuck means of the blockage release device, and the chucking device is released to drop the casting pipe by its own weight and collide with the receiving arm. A method for releasing blockage in a concrete placing pipe, which is characterized by applying an impact.