JPH07180356A - Pipe connecting device for feeding concrete under pressure - Google Patents

Abstract

PURPOSE:To provide a pipe connecting device for feeding concrete under pressure wherein, when a concrete is forced into a form, the surface of the concrete which is forced into the form is made flat and smooth and cost can be reduced and operation efficiency can be improved. CONSTITUTION:A connecting device comprises a closing pipe 10 wherein a closing member 14 for closing a pressure feed port 2 of a form 1 is slidably provided and a connecting pipe 21 for connecting a pressure feed pipe 27. The pipe 10 is connected to the port 2 and the pipe 21 is obliquely connected to the side end of the form 1 of the pipe 10. A push-out bolt 18 for pusing out the member 14 is screw-threadedly engaged with the bottom 12 of a closing pipe 19. And a pin valve 25 is provided in the pipe 21 to open/close the internal passage of the pipe 21. And after concrete is fed under pressure from the pipe 21, the member 14 is pushed out to close the port 2, whereby irregularities are prevented from being formed on the surface of the concrete at the port 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete press-fitting pipe connecting device for connecting a press-fitting port and a concrete press-fitting pipe when press-fitting concrete into the formwork through a press-fitting port provided in the formwork. Regarding

[0002]

2. Description of the Related Art Generally, there is known a method of press-fitting concrete into a space surrounded by a mold rather than simply placing the concrete in the mold from above. In the above-mentioned construction method, a press-fitting port for press-fitting concrete is provided in the formwork, a concrete press-fitting pipe such as a pump car for press-fitting concrete is connected to the press-fitting port, and concrete is press-fitted from the press-fitting port. ing.

A connecting pipe for connecting the concrete press-fitting pipe has been attached to the pressurizing port. Then, the connecting pipe is provided with an opening / closing device for opening and closing the concrete inflow path in the connecting pipe, and after completion of the concrete press fitting, the opening / closing device is closed so that the concrete press fitting pipe can be removed. Was becoming. That is, except when pouring concrete from above the formwork, it was necessary to use the above-mentioned connecting pipe when placing concrete into the formwork by applying pressure from the side or bottom surface of the formwork. .

[0004]

By the way, when the concrete press-fitting pipe is connected through the connecting pipe having the opening / closing device as described above, after the concrete is placed, the opening / closing device is opened from the form of the connecting pipe. Until the concrete will remain. If this is left as it is, the concrete will harden in the connecting pipe and a protruding part will be formed at the position of the pressure inlet of the form of the concrete structure constructed in the form, so remove the concrete in the connecting pipe. Work is required.

In the above removing work, when the concrete is hardened to some extent after pouring the concrete and there is no possibility of flowing out from the pressure inlet, the opening / closing device of the connecting pipe is opened to remove the concrete in the connecting pipe. It was a complicated thing. Further, even if the removing work is performed, the surface of the press-fitting portion of the concrete structure in the form becomes rough, so that further repair work is required. Several proposals have been made for such a problem, but there are problems in workability and cost.

For example, as described above, in order to prevent concrete from remaining inside the connecting pipe in a state where the inside of the connecting pipe and the inside of the form communicate with each other, the inner surface of the form is substantially flush with the inner surface of the form at the position of the pressurizing port of the form. There is a shutter provided so that it can be opened and closed freely. With such a configuration, the projecting portion is not formed at the position of the pressure inlet in the concrete structure constructed in the mold. However, it is necessary to construct a shutter flush with the inner surface of the formwork, which complicates the structure of the connection pipe, and requires processing on the formwork side other than the above pressure inlets. There were problems such as deterioration of workability and increase of cost when mounting on the.

Further, the connecting pipe is generally attached at a right angle to the form, and when concrete is press-fitted through the connecting pipe, the pressure of the form is changed depending on the degree of fluidity of the concrete. There is a case where a large lateral pressure is generated around the inlet, and it was necessary to reinforce the periphery of the inlet of the mold.

The present invention has been made in view of the above circumstances, and it is easily attached to a mold, and a projecting portion is formed on a concrete structure inside the mold at the press-fitting portion of the mold by a simple operation. It is an object of the present invention to provide a concrete press fitting pipe connecting device capable of preventing the formation of a rough surface.

[0009]

According to a first aspect of the present invention, there is provided a concrete press-fitting pipe connecting device for connecting a concrete press-fitting pipe to a concrete pouring formwork provided with a pressurizing port. And a connecting pipe connected to a side surface of the closing pipe, and the closing pipe has a tip end communicating with the inside of the forming frame. In addition, a closing member capable of closing the pressure inlet is slidably disposed therein, and further, the closing pipe is provided with a pressing means for pressing the closing member toward the pressure inlet, and the connection is made. The pipe is connected at its tip to the inside of the closed pipe and is connected to it, and at the rear end thereof is connected to the concrete press-fitting pipe, and the connection pipe is opened and closed to open and close the flow path in the connection pipe. Means that means are provided And the solutions to problems.

A concrete press fitting pipe connecting device according to a second aspect of the present invention is characterized in that:
Fixing means for fixing the closing member in the state of closing the pressure inlet was provided, and the connecting portion of the closing pipe provided with the fixing means to the form, the pressing means, and the opening / closing means were provided. The fact that the parts are detachable is the means for solving the above problems.

According to a third aspect of the present invention, there is provided a concrete press-fitting pipe connecting device in which the connecting pipe is obliquely arranged with respect to the formwork, and the concrete flowing through the connecting pipe to reach the formwork is flown. The means for solving the above-mentioned problem was to make it inclined with respect to the formwork.

[0012]

According to the structure of the first aspect of the present invention, the closing pipe having the closing member is connected to the press-fitting inlet of the form, and the connecting pipe connected to the concrete press-fitting pipe is connected to the closing pipe. Connected, after press-fitting concrete into the formwork from the connection pipe side, the opening and closing means is closed, by pressing the closing member to the pressure inlet by the pressing means, to close the pressure inlet, It is possible to prevent a protrusion from being formed at the press-fitting portion in the concrete structure in the mold.

According to the second aspect of the present invention, since the closing member can be fixed by the fixing means in the state where the pressurizing port is closed at the joint portion of the closing pipe with the frame, In this state, the parts other than the connecting part of the closing pipe with the form, the closing member, and the fixing means are unnecessary,
If the connection part with the form of the closed pipe and the other part are made detachable, the other part can be diverted to the next concrete press-fitting work, and when performing the concrete press-fitting work continuously, It is not necessary to prepare a large number of portions other than the connecting portion of the closing pipe with the frame, the closing member, and the fixing means.

According to the third aspect of the present invention, the inflow direction of the concrete flowing in from the pressure inlet of the mold can be inclined with respect to the mold. It is possible to prevent a large lateral pressure from being applied to the surroundings.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete press fitting pipe connecting device according to an embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are drawings showing a concrete press-fitting pipe connecting device of this embodiment. As shown in FIG. 1, the concrete press-fitting pipe connecting device of this embodiment is to be attached to a press-fitting port 2 of a built-in mold 1, and the press-fitting port 2
The basic configuration is a closed pipe 10 that is attached substantially at right angles to the mold 1 and a connection pipe 21 that is integrally attached to the side face of the closed pipe 10 on the mold 1 side.

The closed pipe 10 has a cylindrical fixed portion 11 fixed to the mold 1 and a bottomed cylindrical bottom which is connected to the end of the fixed portion 11 on the opposite side of the mold 1. The shape is divided into two parts. The fixed portion 11 and the bottom portion 12 are detachably connected via the flanges 11a and 12a. The fixing portion 11 of the closing pipe 10 is provided with a screw hole portion 13 having a screw hole projecting to the outer surface side on the side surface near the end portion on the mold frame 1 side, and the screw hole portion 13 has a closing member to be described later. A fixing bolt 15 as a fixing means for fixing 14 is screwed.

At the end of the fixed portion 11 of the closing tube 10 on the form 1 side, a plate-like flange portion 16 extending around the fixed portion 11 for fixing the fixed portion 11 to the form 1 is provided. Is provided. The bottom portion 12 of the closing tube 10 has a bottom plate 17
A screw hole is formed in the center of the closing member 1.
A push-out bolt 18 is screwed as a pressing means for pressing 4 to the press-in port 2 side.

A cylindrical closing member 14 is disposed inside the closing pipe 10 so as to be slidable in the closing pipe 11 along the axial direction. The diameter of the closing member 14 is formed to be substantially the same as the inner diameter of the closing tube 10. A rubber ring 19 is attached to the outer surface of the tip of the closing member 14 so that the outer surface of the tip of the closing member 14 and the inner surface of the closing tube 11 are in close contact with each other. At, the space inside the closed tube 10 is divided. Further, at the rear end of the closing member 14, the closing pipe 10 is provided.
The grips 20 and 20 are attached so that the closing member 14 inserted into the fixing portion 11 can be easily taken out.

The connecting pipe 21 includes a branch pipe 22 integrally attached to the mold 1 on the side surface of the fixed portion 11 of the closing pipe 10 on the mold 1 side and a pin valve 25 as an opening / closing means. The opening / closing tube 23 and the measuring tube 24 having a pressure measuring device (not shown) are connected to each other. The branch pipe 22 of the connection pipe 21 is integrated with the fixed portion 11 of the closed pipe 10, and the fixed portion 11
And the branch pipe 12 form a y-shaped pipe. The open / close pipe 23 is provided with a pin valve 25 having a shutter (not shown) driven by a rack 25a and a pinion 25b. The reference numeral 25c is a guide piece for guiding the shutter.

The branch pipe 22 and the opening / closing pipe 23 are detachably connected via the flanges 22a and 23a. A pressure measuring device (not shown) is arranged inside the measuring pipe 24, and the pressure of the concrete press-fitted into the mold 1 can be measured by the meter 26. The opening / closing tube 23 and the measuring tube 24 are detachably connected via the flanges 23a and 24a.
A concrete press-fitting pipe 27 extending from a pump car (not shown) for press-fitting concrete is detachably connected to the measuring pipe 24 via flanges 24a and 27a.

Next, a method of press-fitting concrete into the mold 1 using the concrete press-fitting pipe connecting device having the above-described structure will be described. First, the mold 1 having the press-fitting hole 2 is built in, and the branch pipe 22 of the connection pipe 21 is built.
The fixed portion 11 of the closed pipe 10 that is integrally connected to form a y-shape is connected to the portion of the pressurizing port 2 of the mold 1 through the flange portion 16. At this time, the pressure inlet 2 and the tip of the fixed portion 1 are
The concrete is connected so that it will not leak out.

Next, the periphery of the built-in mold 1 is compacted by a compaction member (not shown). Then, the closing member 14 is inserted into the fixed portion 11. At this time, the tip of the fixing bolt 15 screwed into the screw hole 13 of the fixing portion is prevented from protruding into the fixing portion 11. Next, the bottom portion 12 is connected to the rear end portion of the fixed portion 11. The bottom 12
The screw 18 is screwed in advance.

Next, the closing member 14 is pushed backward to
Make sure that the opening of the end of the branch pipe 22 is not blocked.
The push bolt 18 is also moved backward. Next, the opening / closing pipe 23 is connected to the branch pipe 22, and the measuring pipe 24 is connected to the opening / closing pipe 23. In this state, the concrete press-fitting pipe 27 of the pump car (not shown) is connected to the measuring pipe.

In this state, the concrete press fitting pipe connecting apparatus of this embodiment is in the state shown in FIG. next,
The pin valve 25 of the open / close pipe 23 is opened, concrete is pumped from the pump car, and the concrete is press-fitted into the mold 1 through the concrete press-fitting pipe connecting device. At the stage where the formwork 1 is fully filled with concrete,
The pumping of concrete by the pump car is stopped and the pin valve 25 is closed.

Next, the push-out bolt 18 is rotated by a ratchet spanner or the like so as to extend into the closing pipe 10, so that the closing member 14 is slid toward the pressure inlet 2. Then, as shown in FIG. 2, when the front surface of the closing member 14 and the inner surface of the mold 1 are substantially flush with each other, the rotation of the pushing bolt 18 is completed.

As described above, the closing member 14 in the closing pipe 10
By pushing forward, the concrete remaining in the closed pipe 10 is filled in the formwork 1 and the forward movement is stopped when the front surface of the closing member 14 is flush with the inner surface of the formwork 1. Thus, the front surface of the closing member 14 becomes a part of the mold 1, and it is possible to prevent concrete from projecting or roughening the surface at the pressurizing port 2 of the mold 1.

Next, with the front surface of the closing member 14 flush with the inner surface of the mold 1, the fixing bolt 15 screwed into the screw hole portion 13 of the fixing portion 11 of the closing pipe 10 is rotated. The tip is extended into the fixing portion 11, and the fixing bolt 15 presses the closing member 14 in the radial direction. The closing member 14 pressed by the fixing bolt 15 is
Since the pressurizing port 2 of the above is fixed in a closed state, at this time, the closing member 14 is supported by the pushing bolt 18,
It is not necessary to close the opening / closing tube 23 with the pin valve 25.

Next, the concrete press-fitting pipe 27 extending from the pump car is removed from the measuring pipe 24, and the measuring pipe 24 is sequentially removed from the open / close pipe 23 and the open / close pipe 23 is removed from the branch pipe 22. Also, the closed tube 1
The bottom portion 12 of 0 is removed together with the push bolt 18 from the fixed portion 11.

The on-off pipe 23, the measuring pipe 24, and the bottom 12 that have been removed are washed with water to remove the concrete. On the other hand, in the mold 1, the concrete in the mold 1 is cured while the pressurizing port 2 is closed by the closing member 14, and as described above, the inner surface of the mold 1 and the closing member 14 are closed. By arranging the front surface of the same to be flush, it is possible to prevent unevenness due to the pressure inlet 2 from being formed on the surface of the hardened concrete.

On the surface of the hardened concrete,
There is a possibility that a slight unevenness corresponding to the shape of the pressure inlet 2 may be formed at the position of the pressure inlet 2, but even if the unevenness is formed, it is slight and can be ignored or repaired. It can be easily repaired as a thing. Further, there is a formwork built in separately from the formwork 1, and when the concrete is continuously press-fitted, the on-off pipe 23, the measurement pipe 24, and the bottom 12 which have been removed are removed.
If a plurality of portions in which the fixing portion 11 and the branch pipe 22 are integrally joined in a y-shape are prepared, the concrete press-fitting work can be continuously performed.

Then, when the concrete is hardened,
The closing member 14 is pulled out from the fixing portion 11 of the closing pipe 10, and the fixing portion 11 of the closing pipe 10 is integrally formed.
And the branch pipe 22 of the connection pipe 21 are removed from the formwork 1.
At this time, since the outer surface of the closing member 14 is in close contact with the inner surface of the fixing portion 11 by the rubber ring 19, it is difficult to pull out the upper closing member 14 from the fixing portion 11. As described above, since the grips 20, 20 are provided at the rear end portion of the closing member 14, the closing member 1
4 can be pulled out easily.

As described above, according to the concrete press-fitting pipe connecting device of the present embodiment, the connecting pipe 21 for press-fitting concrete, the closing pipe 10 for closing the press-fitting port 2 after the concrete press-fitting, and the closing member. 14 is integrally assembled, and in the work from the press-fitting of concrete to the closing of the press-in, it is not necessary to attach or detach members, and the pin valve 25 is simply closed. It suffices to simply push the closing member 14 to close the pressure inlet 2. That is,
It is possible to easily block the portion of the press-fitting port 2 after the press-fitting of concrete to prevent unevenness due to the press-fitting on the concrete surface.

According to the concrete press fitting pipe connecting apparatus of this embodiment, the closing member 1 is simply formed by forming the pressurizing port 2 on the side of the mold 1 without the need to process the mold 1 in particular.
By adjusting the front surface of No. 4 so as to be flush with the inner surface of the mold 1, it is possible to prevent the unevenness due to the pressure inlet 2 from being formed on the surface of the hardened concrete.

As described above, after fixing the closing member 14 to the fixing portion 11 of the closing pipe 10 with the fixing bolt 15 in the state where the pressure inlet 2 is closed by the closing member 14, the opening / closing pipe 23 and the measuring pipe 24, the bottom 12 of the closure tube 10 and the push-out bolt 18 are unnecessary, and it is not necessary to connect them to the formwork 1 during curing of the press-fitted concrete. Therefore, the opening / closing pipe 23, the measuring pipe 24,
The bottom portion 12 of the closing pipe 10 and the push-out bolt 18 can be removed and can be diverted to press-fitting concrete into another form, and the equipment cost of press-fitting concrete can be reduced.

Further, the connection pipe 21 connected to the concrete press-fitting pipe 27 is arranged in a state of being inclined with respect to the formwork 1, and the press-fitting direction of the concrete is set in the formwork 1.
It is designed to lean against. Therefore, the lateral pressure applied around the pressurizing port 2 of the mold 1 can be reduced, and excessive reinforcement around the pressurizing port 2 of the mold 1 is not required.

Further, in the case of a connecting pipe perpendicular to the form 1,
Conventionally, in order to reduce the lateral pressure applied around the pressure inlet 2 of the mold 1, there is a case where a blowout port protruding into the mold 1 is used, but in the concrete press fitting pipe connection device of this embodiment, as described above. Since the lateral pressure applied around the pressurizing port 2 can be reduced, it is possible to prevent foreign matters such as the blowing port from remaining inside the concrete without the need for the blowing port.

In the above embodiment, the pushing bolt 18 is used as the pressing means for the closing member 14, but the power of the hydraulic cylinder or the like may be used. In addition, the closing member 14
In order to make the front surface of the same flush with the inner surface of the mold 1, a stopper or the like may be provided on the pressing means such as the push-out bolt 18 so that the positioning can be easily performed. Further, although the pin valve 25 is used as the opening / closing means in the above embodiment, other opening / closing means may be used.

[0038]

As described in detail above, according to the connection pipe for press-fitting concrete according to claim 1 of the present invention, the connection pipe for press-fitting concrete and the press-in port for closing the press-fitting port after press-fitting concrete are closed. The closing pipe and the closing member are integrally assembled, and in the work from the press-fitting of concrete to the closing of the pressure inlet, the work of attaching and removing the member is not required, and the opening / closing means is simply closed. At the same time, it is possible to prevent the portion of the pressure inlet from being closed after the concrete is pressed in by a simple operation of pushing out the closing member to close the pressure inlet, thereby preventing the concrete surface from being uneven due to the pressure inlet.

Further, according to the concrete press-fitting pipe connecting device of the present invention, only by forming the pressure inlet on the mold side, the front surface of the closing member is formed on the inner surface of the mold without processing the mold side in particular. By adjusting so as to be flush with the surface of the hardened concrete, it is possible to prevent the unevenness due to the pressure inlet from being formed on the surface of the hardened concrete. In other words, it is not necessary to provide a dedicated formwork or the like, and it is possible to prevent unevenness in the position of the pressure inlet on the concrete surface without increasing the equipment cost for press-fitting the concrete.

According to the concrete press fitting pipe connecting device of the second aspect, the opening / closing means and the pressing means are not required after the closing member is fixed by the fixing means in a state where the pressure inlet is closed by the closing member. Since the opening and closing means and the pressing means are detachable during curing of the concrete press-fitted into the formwork, it can be diverted to the press-fitting of concrete into another formwork. The equipment cost can be reduced.

According to the concrete press-fitting pipe connecting device of the third aspect, the side pressure applied around the press-fitting port of the form can be reduced by inclining the press-fitting direction of the concrete with respect to the form. The equipment cost can be reduced without requiring excessive reinforcement around the pressurizing port of the mold.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a concrete press fitting pipe connection device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the press-fitting inlet of the form is closed in the concrete press-fitting pipe connecting device of the above-described embodiment.

FIG. 3 is a cross-sectional view showing a state in which an unnecessary portion is removed during concrete curing in the concrete press-fitting blade pipe connecting device of the above embodiment.

[Explanation of symbols]

 1 Formwork 2 Pressurizing Port 10 Closing Pipe 14 Closing Member 18 Extruding Bolt (Pressing Means) 21 Connection Piping 25 Pin Valve (Opening / Closing Means) 27 Concrete Press-fitting Piping

Claims (3)

[Claims] 1. A concrete press-fitting pipe connecting device for connecting a concrete press-fitting pipe to the press-fitting port by providing a press-fitting port in the concrete pouring formwork, which is connected to the press-fitting port of the formwork. The closing pipe is provided with a connecting pipe connected to a side surface of the closing pipe, and the closing pipe has its tip end communicated with the inside of the mold and can close the pressure inlet therein. A closing member is slidably arranged, and further, the closing pipe is provided with a pressing means for pressing the closing member toward the pressure inlet side, and the connecting pipe has a tip end communicating with the inside of the closing pipe. For concrete press-fitting, which is connected and at the rear end thereof is connected to the concrete press-fitting pipe, and the connection pipe is provided with an opening / closing means for opening and closing a flow path in the connection pipe. Pipe connection device. 2. A fixing means for fixing the closing member in a state in which the pressure inlet is closed, is provided at a connection portion of the closing pipe with the mold, and the closing pipe is provided with the fixing means. The pipe connecting device for concrete press-fitting according to claim 1, wherein a connecting portion with the mold and a portion provided with the pressing means and the opening / closing means are detachable. 3. The connecting pipe is arranged obliquely with respect to the form, and the flow of concrete flowing through the connecting pipe and reaching the form is inclined with respect to the form. The pipe connection device for concrete press-fitting according to claim 1 or 2.