JPH057856A - Washing device for concrete placing pipe - Google Patents

Abstract

PURPOSE:To allow the washing of the inside of a tremie pipe without discharging washing water to the front end of the pipe and to allow the repetitive use of a cleaner sponge used for washing. CONSTITUTION:The washing device has a washing pipe 18 which is connected to a concrete press feed pipe 14 side and forcibly feeds the washing water by the discharge pressure of a water pressure feed pump 16, a cleaner sponge 20 which is inserted in the washing pipe 18 to block the inside thereof to the front and rear and is transferred toward the front end side of the tremie pipe 12 through the concrete press feed pipe 14 by the water pressure, and a sponge sensor 22 and valve 24 which are provided on the front end side of the tremie pipe 12. While a magnetic detection type proximity sensor is used for the sensor 22, a magnet 28 which is a body to be detected is embedded in the cleaner sponge 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete casting pipe cleaning apparatus capable of cleaning the inside of a concrete pumping pipe and a tremie pipe by discharging the residual concrete after the finishing work. The inside of the tube can be cleaned without discharging water to the tip of the tremie tube.
Further, the present invention relates to a cleaning device for concrete pouring pipes that can repeatedly use the cleaner sponge used for cleaning.

[0002]

2. Description of the Prior Art If concrete that remains inside a concrete pumping pipe is left standing after the concrete pouring work is completed, it will solidify inside and cannot be reused. It is pumped and the residual concrete is discharged.

Particularly in the case of the underwater concrete construction method, the inside of the tremie pipe for concrete placing is cleaned, but if the washing water is simply poured, the washing water is discharged to the tip portion of the tremie pipe and already poured. Since it is sprayed on the concrete and causes water contamination due to stirring, a sponge is usually inserted in the cleaning pipe, and the front and rear of the pipe are divided into concrete and water by this sponge, and the pipe is moved by water pressure. The excess concrete is discharged to the tip of the tremie pipe and is prevented from being discharged to the outside by moving the tremie pipe to the most distal position and stopping it there.

In order to perform this stop control, a metal detection type proximity sensor is conventionally provided at the tip of the tremie tube, and a shutoff valve is provided at the tip of the proximity sensor, while the object to be detected is inside the cleaner sponge. A body with aluminum foil embedded is used. As shown in FIG. 3, the sponge 1 has an outer cylinder 1a and an inner cylinder 1b fitted therein, and an aluminum foil 2 is sandwiched between the outer cylinder 1a and the inner cylinder 1b.

In this structure, when the sponge 1 passes the proximity sensor, the aluminum foil 2 is detected by the proximity sensor, and the detection output causes the valve to be closed.
Although it stops the water pump, it had the following drawbacks.

[0006]

That is, the metal detection type proximity sensor has a detection limit at a distance of about 10 mm, and if the thickness of the outer cylinder 1a is large, a detection error is likely to occur, which is a practical problem. . Also, since the sponge 1 used for cleaning is compressed back and forth, the aluminum foil 2 embedded inside is crushed and permanently deformed into a compressed state, so it cannot be reused and is disposable. It was uneconomical to prepare a new sponge for each washing.

The present invention has been made to solve the above problems, and an object thereof is to provide a cleaning device for concrete pouring pipes which can reliably detect passage of the cleaner sponge and can reuse the cleaner sponge after cleaning. There is.

[0008]

In order to achieve the above object, the present invention provides a concrete pumping pipe connecting to a concrete pump, which is connected to the concrete pumping pipe side by switching and discharges a water pumping pump. A cleaning pipe that pumps cleaning water by pressure, a cleaner sponge that is inserted into the cleaning pipe and is transferred by water pressure toward the tip side of the tremie pipe connected to the tip of the concrete pumping pipe, and the tip of the tremie pipe In a concrete pouring pipe cleaning apparatus equipped with a sponge sensor that is disposed at a portion to detect passage of the cleaner sponge and a valve that shuts off a flow path by a detection output of the sponge sensor, a magnet is embedded inside the cleaner sponge. In addition, the sponge sensor is a magnetic proximity sensor.

[0009]

With the above construction, the magnetic proximity sensor can reliably detect the passage of the magnetic proximity sensor according to the strength of the magnetic force of the magnet. The crushed sponge recovers from compression, but the magnet embedded inside does not permanently deform.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows the overall construction of a concrete pouring pipe cleaning apparatus according to the present invention. In the figure, a concrete pumping pipe 14 connects between the concrete pump 10 and the tremie pipe 12. At the connecting portion between the concrete pressure-feeding pipe 14 and the concrete pump 10, a cleaning pipe 18 is provided which is connected to the concrete pressure-feeding pipe 14 side by switching and pressure-feeds the cleaning water by the discharge pressure of the water pressure-feeding pump 16. The cleaning pipe 18 is provided with a cleaner sponge 20 that divides the inside into front and rear and is transferred by hydraulic pressure toward the tip side of the tremie pipe 12 through the pressure feeding pipe. Further, a sponge sensor 22 is provided on the tip side of the tremie tube 12, and a normally open pneumatically actuated valve 24 is provided at the tip thereof.

A pin valve 26 is arranged at the tip of the cleaning pipe 18 to prevent the cleaner sponge 20 previously stored in the pin valve 26 from jumping out.

The cleaner sponge 20 is shown in FIG.
As shown in (b), a rubber 30 molded around a magnet 28 as an object to be detected is used as a core, and the periphery thereof is covered with a cylindrical sponge body 32. Further, front and rear surfaces of the sponge body 32 serve as pressure receiving plates. The rubber plate 34 is integrally arranged.

The sponge sensor 22 is a magnetic proximity sensor such as a semiconductor magnetoresistive element, and is located at the tip of the tremie tube 12 and is peeped inside the tremy tube 12 via a watertight fitting 36. As shown in FIG. 1, the signal processing relay circuit 38 is fixed to the outer peripheral portion.
It is connected to the compressor 40 for driving the valve 24 and the pump 16 for water pressure transmission via the.

In the above construction, when the concrete pouring work is completed, the concrete pumping pipe 14 is connected to the cleaning pipe 18, the pin valve 26 is pulled out, and the pump 16 is driven. The cleaner sponge 20 is transferred while being elastically deformed in the front and rear and in the radial direction in the concrete pumping pipe 14 in response to the water pressure, and in response thereto, the cleaner sponge 14 and the tremie pipe 1 are transferred.
The concrete remaining inside 2 is sequentially discharged from the tip of the tremie pipe 12. When the cleaner sponge 20 finally passes through the attachment position of the sponge sensor 22, the sponge sensor 22 detects the magnetism of the magnet 28 embedded inside the cleaner sponge 22, and the detection output drives the signal processing relay circuit 38. , A valve closing signal is sent to the compressor 40 for driving the valve 24, whereby the valve 24 closes the flow path. At the same time, a stop signal is sent to the pump 16, and the pump 16 also stops to remove the back pressure on the cleaner sponge 20.

The cleaner sponge 20 is controlled by the valve 24 according to the timing of passage to the sensor 22.
Is held in contact with the upstream side of the valve 24, so that the upstream side of the valve 24 becomes a space filled with cleaning water, and only some of the concrete remains on the innermost end of the tremie pipe 12 on the downstream side of the valve 24.

After this, the tremie tube 12 is pulled up and the valve 2
When opening 4, the cleaner sponge 20 can be taken out together with the cleaning water. The taken out cleaner sponge 20 is elastically compressed and recovered, and the adhering concrete is washed away, so that the cleaner sponge 20 can be set again inside the cleaning pipe 18 as shown in FIG. 1 for use.

[0017]

As described above in detail with reference to the embodiments, in the concrete pouring pipe cleaning apparatus according to the present invention, the magnetic proximity sensor can detect the passage thereof according to the magnetic force of the magnet. Passage detection of the cleaner sponge becomes more reliable than the one using the detection type proximity sensor. Also, the sponge crushed by the cleaning work will recover compression when taken out, but the magnet embedded inside will not permanently deform and can be reused many times after taken out from the tremie tube, It is economical.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the overall configuration of a concrete pouring pipe cleaning apparatus according to the present invention.

FIG. 2A is a side cross-sectional view showing a relationship between a cleaner sponge and a sponge sensor. (B) is a plane sectional view of the same.

FIG. 3 is a plan sectional view showing a cleaner sponge used in a conventional cleaning device.

[Explanation of symbols]

 10 concrete pump 12 tremie pipe 14 concrete pressure feed pipe 16 water pressure feed pump 18 cleaning pipe 20 cleaner sponge 22 sponge sensor (magnetic proximity sensor) 24 valve 28 magnet

Claims (1)

Claim: What is claimed is: 1. A washing pipe for connecting a concrete pumping pipe to a concrete pump, the washing pipe being connected to the concrete pumping pipe side by switching, and pumping the washing water by the discharge pressure of the water pumping pump. A cleaner sponge that is inserted into the cleaning pipe and is transferred by water pressure toward the tip side of the tremey pipe connected to the tip of the concrete pumping pipe; and the cleaner disposed at the tip of the tremy pipe. In a concrete pouring pipe cleaning apparatus including a sponge sensor that detects passage of a sponge and a valve that blocks a flow path by a detection output of the sponge sensor, a magnet is embedded inside the cleaner sponge, and the sponge sensor is installed. A washing machine for concrete pouring pipes, which is a magnetic proximity sensor.