JPS62111022A - Expandible placing tube device for concrete placement - Google Patents

Abstract

PURPOSE:To eliminate the needs for the cutting and shortening operation of placing tube by providing an outer placing tube through a water-sealing device to the lower part of an inner placing tube in a freely sliding manner. CONSTITUTION:Ready-mixed concrete is released from the lower end of an outer placing tube 2 through an inner placing tube 1 from a hose 10 to form a concrete-placed portion 40. When the surface of the concrete rises and the discharge port of the outer tube 2 is buried, the wire rope 6 of a winder 3 is wound up to pull up the outer tube 2 through a water-sealing device 20 for the outer tube 2 and a pulley 7 connected to the outer tube 2.

Description

[Detailed description of the invention] [Industrial field of application J] The present invention relates to ready-mixed concrete 1 for constructing civil engineering and architectural structures.
- This invention relates to a highly efficient telescoping pouring pipe device for concrete pouring that prevents deterioration of the quality of concrete, especially when pouring is carried out under water.

[Technical weight and conventional technology] In the conventional concrete pouring pipe method, the amount of rise of the pouring surface during pouring is constant (approximately 3rrLF1 degree) in order to allow the fresh concrete to pass through the pouring pipe smoothly. When the height is reached, the pouring is temporarily stopped and a part of the poured pipe (approximately 3 m) is cut off, the pipe is replaced, and concrete I is poured again. This method is repeated to install the suspension.

Also, depending on the type of concrete to be poured, bamboo-shaped,
This is a method of raising the pouring pipe discharge port by finely finely and further following the upper back of the pouring surface, and as it is pulled up, the connecting part that transports and supplies concrete to the pouring pipe and the concrete is also raised at the same time. Because of the upward movement of 1', a support mechanism is required that can movably hold the equipment for conveyance and supply. One of the causes of quality deterioration of poured concrete is that the interruption of pouring creates voids inside the pouring pipe, which causes water or air to enter the concrete during the next pouring. It can be separated by

Replacing the pouring pipe requires temporarily stopping concrete pouring, and replacing the pipe is not easy, especially when the conveyor supply connection is located at a high position.In addition to being time-consuming, the work is difficult. It also comes with danger.

However, it has been desired to develop a device that eliminates the need to replace the cast pipe, which is a predisposing factor to these problems.

[Object of the invention] The purpose of the present invention is to provide a device that eliminates the above-mentioned conventional problems, and has an expandable structure for the concrete 1 to the pouring pipe, so that the discharge along the upper back of the concrete pouring surface can be expanded and contracted. Even if the outlet is raised, there is no need to top-up the entire pouring pipe, and by eliminating the need to raise it, construction eliminates the need for pipe replacement such as cutting of the pouring pipe and interruption of pouring. The purpose is to provide a device that performs the following steps.

[Structure of the Invention] According to the telescopic pouring device for concrete pouring of the present invention,
A pedestal placed above the pouring section, a pouring pipe support device attached to the pedestal, an inner pouring tube held by the pouring tube support device, and a water sealing device below the inner pouring tube. (The outer tube for casting iQ, the pulley installed on the top of the outer tube for pouring, and the hoisting machine placed on the pedestal to wind up the wire rope passed around the pulley) It consists of:

[Preferred Embodiment] In carrying out the present invention, the above-mentioned pouring device is provided with a bracket i- provided at the lower end of the outer pouring pipe and an interface detection switch suspended from the bracket. It is preferable to add means for sending a hoisting signal to the hoisting machine when the detection switch detects the top surface of the poured concrete. By doing so, the device can be automatically controlled.

[Operations and Effects of the Invention] As described above, the present invention has a structure in which the pouring pipe itself can expand and contract, so the discharge port is raised by following the rise of the pouring part and shortening the total length of the pouring pipe, thereby increasing the height of the pipe. There is no need to interrupt pouring as there is no need for replacement.

It is also possible to select at any time either the conventional method of raising at fixed intervals or the method of raising at constant follow-up.

Furthermore, since the casting pipe itself shrinks, the connecting portion serving as the supply port from the concrete conveying pipe to the casting pipe can always be kept at a constant position, making it easier to support the conveying pipe. Furthermore, when raising the discharge port as the pouring surface rises due to pouring fresh concrete, there is no need to change pipes, and continuous pouring can be performed without interrupting concrete I placement. By having the opening that supplies the pipe at a fixed position, it prevents the quality of poured concrete from deteriorating, increases the amount of poured concrete per hour, and greatly reduces labor costs, making it possible to reduce the amount of fresh concrete that can be poured by humans. It has the effect of realizing high-quality, low-cost, and safe pouring work.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

The telescopic pouring pipe device of the present invention can be constructed in the sea, lakes, rivers, and land! If the ready-mixed concrete is to be poured into a structure under water, transporting the concrete to the pouring site by agitator trucks, pumps, cranes, or other means will ensure the efficiency and quality of the ready-mixed concrete. This is a device that allows the concrete to be dropped and conveyed to the pouring section without falling. As an example of construction, we will use a pump to transport the ready-mixed concrete in a construction project in which ready-mixed concrete is poured into the seabed below sea level and launched as the bottom slab of a bridge foundation constructed in the ocean.
Examples are shown in FIGS.

In Figure 1, a pedestal 4 is mounted on a pedestal 9 installed on the ground.
but! The hoisting machine 3 is mounted on the frame 4.

- On this pedestal 4, a pouring pipe support device 30 is also arranged,
The inner pouring pipe 1 is suspended from this pouring tube support device.

The upper end of the inner pipe 1 for pouring is connected to a concrete pump (not shown) via a hose 10 for pouring, and the lower end of the inner pipe for pouring is connected to a concrete pump (not shown) via an outer pipe water sealing device 20. tube 2
is communicated with. The details of this outer tube water sealing device 20 are shown in FIGS. 2 and 3. A pair of pulleys 7 are attached to the outside of the outer tube water sealing device 20, and one pulley m7 is attached to the outside of the outer tube water sealing device 20. The wound wire rope 76 passes through the upper pulley 8 and the other pulley 7, and passes through the upper rope guide roller 5.
It is adapted to be wound up by a winding machine 3 via the winding machine 3.

Outer tube water seal! 20 has a seal packing 24 and a seal ring 2b that are in contact with the outer wall surface of the inner pipe 1 for pouring, a seal presser 22 that holds the seal packing 24, and a flange joint that also serves as the seal housing 21. It has a structure that is connected to an off-site pipe 2.

On the other hand, an inner pipe water sealing device 12 is provided at the lower end of the inner pipe for pouring 1, as shown in FIG.

The inner tube water sealing device 12 is composed of a seal housing 12a that holds a seal packing 12b that is in contact with the inner wall surface of the outer pouring tube 2. Next, the pressure inside the pouring pipe M30
The structure is shown in FIG. 5, in which the inner pipe 1 for pouring is held between a fixed block 32 and a movable block 31. Both blocks 31 and 32 are always urged in the open direction by a coil spring 36, and the movable block 31 is connected to a fastening frame 34 by a bolt 33. A journal jack 35 is provided between the fastening frame 34 and the fixed block 32, and the jack 35 is operated to grip and release the inner pouring pipe 1.

Since the basic structure of the apparatus of the present invention is constructed as described above, ready-mixed concrete is sent from the hose 10 through the inner pipe for pouring to the outer pipe and discharged from the lower end. A concrete placement section 40 shown in the figure is formed.

As pouring continues, fresh concrete 1 is deposited on the bottom and the surface rises. Due to this rise, the discharge port of the pouring pipe is buried, and when the depth of burying increases, the pressure inside the pouring pipe increases, making it impossible for concrete to pass through, so the discharge port must be raised to reduce the depth. As an upper limit, a hoisting machine 3 is attached to a pedestal 4, and a wire row 1
6, the outer pipe for pouring 2 is pulled up via a pulley 7 attached to the outer pipe water sealing device 20 connected to the outer pipe for pouring 2, and the discharge port is raised. At this time, the inner pipe for pouring 1
is fixed by the pouring tube support device 30, and only the outer pouring tube 2 rises. A water sealing device 12 is provided between the inner tube and the outer tube.
．． 20 is provided, water inside the pouring pipe and outside water are completely cut off, and even if the outer pouring pipe 2 is slid to clean the discharge port, there is no risk of water entering the ready-mixed concrete passing through the pouring pipe. There is no contamination of external water and there is no risk of quality loss. Moreover, since this upper limit work can be carried out even while pouring the ready-mixed concrete 1 to 1, there is no need to interrupt pouring.

In order to make the behavior of the outer pouring pipe 2 smooth when raising it, as shown in Fig. 2, two pulleys 7 are arranged symmetrically and four wire ropes 6 are hung so that the front, back, left and right balance is maintained. It has a shape that allows it to be lifted, and the structure is such that it does not sag when rising.

Next, an embodiment of a device that uses the basic structure of the present invention to automatically wind up an outer pipe for pouring concrete by detecting the rise of the concrete pouring surface will be described.

Figures 6 and 7 are side views showing the discharge part of the pouring pipe in an example of pouring ready-mixed concrete on the ground below the water level. The purpose of this article is to describe a method for raising the discharge port.

In the case of normal ready-mixed concrete, as shown in Figure 6, the discharge 1 of the pouring pipe is always at the concrete pouring section 4, which has already been poured.
Pour the concrete with it buried under 0. Furthermore, depending on the type of fresh concrete, as shown in FIG. 7, there are pouring methods in which the outlet of the pouring pipe must be above the concrete pouring surface 40. In the case of the method shown in Fig. 6, the embedment depth B shown in the figure is determined based on the concrete properties, but if the embedment depth becomes greater than 8 during pouring, the smoothness of the fresh concrete flowing down inside the pouring pipe may deteriorate. It becomes impossible to pass.

Therefore, when the burial depth of the discharge port reaches the value B, in order to circumscribe the discharge port, move the pouring pipe upward to the extent that the discharge port is buried in the already poured ready-mixed concrete. must be lifted. In the case of method 7 shown in Fig. 7, the outlet of the pouring pipe must always be above the already poured ready-mixed concrete, and the interval between them must be as short as possible. Due to pouring, the pouring pipe must be lifted to raise the discharge port according to the upper limit of the same plane.

Both FIG. 6 and FIG. 7 show a situation in which a concrete surface interface detection switch 14 is installed in order to automatically lift the pouring pipe in conjunction with the rise of the fresh concrete pouring surface. The overall structure of both is based on the structure shown in Figures 1 to 5, and an interface detection switch 14 is attached to the outer pouring pipe 2, which detects the fresh concrete pouring surface and outputs the detection signal. The method is such that the hoisting 113 mounted on the pedestal 4 is operated and hoisted up the outer pouring pipe 2 to raise the discharge port. The interface detection switch 14 has a diode glass tube filled with mercury inside, and depending on the overall posture of the switch, the mercury in the glass tube can cause the current to flow between the two electrodes.
It operates on the principle of "blocking" the switch, and changes the overall weight of the switch depending on the specific gravity of the liquid being detected. When using the switch in the present invention,
Adjust the weight to be heavier than the specific gravity of water or seawater, but lighter than the fresh concrete, and stand it vertically until the fresh concrete comes into contact with it, and as the fresh concrete comes into contact with it, it floats to the same surface and falls over. The method is to detect the fresh concrete surface by activating a switch.

The details of FIGS. 6 and 7 will be explained below.

A bracket 16 and a chain 1 are attached to the outer surface of the outer pipe 2 for pouring.
A telescopic pouring system equipped with a fresh concrete surface detection section consisting of a signal cable 15 that suspends an interface detection switch 14 through a cable 7 and transmits "pass" and "no" signals from the switch to the hoisting machine 3 on the upper part. As shown in Fig. 6, when fresh concrete is poured continuously from the discharge part of the outer pouring tube 2, the pouring surface rises, passes the surface shown in (A), and then continues (
It reaches the plane shown in (b). The interface detection switch 14 hangs vertically until the pouring surface reaches the surface shown in (b), but when the pouring surface approaches the surface shown in (b) and comes into contact with the bottom of the switch, the switch itself is suspended. When the switch is in a state where it is floating above the construction surface and the concrete surface is at the position shown in (b), the switch is laid down on its side, and the change in energization inside the switch becomes a signal and is transmitted to the upper part through the signal cable 15. Upon receiving this signal, the hoist 3 is operated, and the outer pipe 2 for pouring is moved to the buried depth B as shown in the figure.
Raise by a smaller distance.

In FIG. 7, the equipment is the same as that explained in FIG. 6, but it is an example of a pouring method in which the concrete discharge port is placed above the pouring surface. The pouring surface is raised by the ready-mixed concrete discharged from the outer pouring pipe 2, and this rise activates the interface detection switch 14, which receives the activation signal and operates the hoisting machine 3 to raise the pouring surface. Raise 2.

In this case, the Rffi on the pouring pipe is such that the fresh concrete discharge port is above the pouring surface, and in order to minimize the distance, winding is performed in stages every few centimeters.

Regardless of the placing method shown in FIG. 6 or FIG. 7, the apparatus of the present invention allows concrete to be placed without interrupting concrete placement.

[Summary] As described above, the present invention is particularly applicable to an apparatus for placing ready-mixed concrete under water, in which the pouring pipe has an expandable structure consisting of an inner pipe and an outer pipe, and as concrete I to pouring rises. Since the pouring pipe is made to shrink, there is no need to cut down the pouring pipe, and high-quality structures can be built by continuous concrete pouring. Furthermore, since the rise of the concrete pouring surface is automatically detected and the outer pouring tube is raised by remote control, the outlet of the pouring tube can always be controlled to the optimum height.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of the telescoping type gastric tube device of the present invention, Fig. 2 is a view taken from the mark A in Fig. 1, and Figs. 3 and 4 respectively show the telescoping mechanism. 5th cross-sectional view of the structure of
The figures are plan views of the structure that supports the pouring pipe, Figures 6 and 7.
Each figure shows an application means based on the present invention. 1... Inner pipe for pouring 2... Outer pipe for pouring 3... Winding machine 4... Frame 5... Lobe guide row 5
6... Wire rope 7... Pulley 8... Pulley
9... pedestal 10... installation hose 20...
Outer pipe water sealing device 21... Seal housing 22.
・Seal holder 23 ・・・Seal holder bolt 2
4...Seal packing 25...Seal ring
26... Connection bolt nut 12... Inner pipe water sealing device 12a... Seal housing 12b.
... Seal packing 30 ... Casting pipe support device
31...Movable block 32...Fixed block 3
3... Tightening bolt nut 34... Tightening frame 35... φ journal jack 36... Coil spring 14... Interface detection switch 15...
・Signal cable 16...Bracket 17...
・Link chain Fig. 2 Fig. 6 Bottom ground - Fig. 7 Yum crystal q4 Tayu g

Claims (1)

[Claims] In a pouring pipe device for pouring fresh concrete,
A pedestal placed above the pouring section, a pouring pipe support device attached to the pedestal, an inner pouring tube held by the pouring tube support device, and a water sealing device below the inner pouring tube. The outer pouring pipe is slidably inserted through the outer pouring pipe, the pulley provided on the upper part of the outer pouring pipe, and the hoisting machine placed on the frame to wind up the wire rope that is passed around the pulley. A telescopic pouring device for concrete pouring, which is characterized by: