JPH0726506U - Connection structure of concrete pressure pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To enable joint work between two concrete pumping pipes to be performed reliably and efficiently by one person without causing displacement. [Structure] A tip portion is inserted into the outer periphery of the open end of the first concrete pressure-feeding pipe 11, and a second flange 14 protruding from the outer periphery of the tip portion is used as the first flange of the first concrete pressure-feeding pipe. The second concrete pressure-feeding pipe 13 which is held by the first concrete pressure-feeding pipe 11 by being brought into contact with the second concrete 12 and has an inner peripheral surface which is uniform with the inner peripheral face of the first concrete pressure-feeding pipe 11 is provided. By mounting the ring-shaped packing 16 on the abutted first flange 12 and second flange 14 so as to cover them from the outside, and covering the packing 16 from the outside by the joint clamp 17, This is the first flange 12 and the second
To be fixed to the flange 14 of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concrete pumping pipe connection structure used to pump fresh concrete from a concrete pump truck or the like to a work site.

[0002]

[Prior art]

 Conventionally, in order to continuously supply ready-mixed concrete to a work site, a method has been generally adopted in which fresh concrete is supplied from a concrete mixer to a hopper of a concrete pump car, and the concrete is pumped to a driving place through a concrete pumping pipe. There is.

In this case, when the fresh concrete is pumped over a long distance, it is necessary to connect and use the concrete pumping pipes. Therefore, the fresh concrete and water do not leak at the connecting part. Such a watertight configuration is adopted.

FIG. 5 is a cross-sectional view showing the connection structure of such a conventional concrete pressure-feeding pipe. According to this, the flange 2 at the end of the first concrete pressure-feeding pipe 1 and the flange 4 of the second concrete pressure-feeding pipe 3 are shown. And a ring-shaped packing 5 having a U-shaped cross section made of rubber or the like is abutted or fitted on the flanges 2 and 4 so as to cover the outsides of the flanges 2 and 4, respectively. The flanges 2 and 4 are connected by a joint clamp 6 so as to apply pressure to the outside.

[0005]

[Problems to be solved by the device]

 However, in such a conventional connection structure for a concrete pressure pipe, the above-mentioned work of abutting the flanges 2 and 4 and attaching the joint clamp 6 requires a pair of concrete pressure pipes to be connected by one operator with both hands. It is necessary to horizontally support the other worker to abut the packing 5 on the outside of the flanges 2 and 4 and to attach the joint clamp 6, and therefore, it is necessary to carry out such a joint work. When a human worker is involved, work efficiency is poor, and since there is no axial alignment at the joints of the flanges 2 and 4, misalignment of these easily occurs, and when concrete or water leaks from this joint. There were problems such as being there.

The present invention has been made by paying attention to the above-mentioned conventional problems, and the joint work of two concrete pressure-feed pipes can be performed by one person surely and efficiently without causing positional displacement. The purpose is to obtain a concrete pumping pipe connection structure that can be implemented in

[0007]

[Means for Solving the Problems]

 The connection structure of the concrete pumping pipe according to the present invention comprises a first concrete pumping pipe having a first flange projecting on the outer periphery near the opening end, and a tip on the outer periphery of the opening end of the first concrete pumping pipe. A second concrete pressure-feeding pipe held by the first concrete pressure-feeding pipe by bringing a second flange projecting on the outer periphery of the tip portion into contact with the first flange. A ring-shaped packing is attached to the abutted first and second flanges so as to cover them from the outside, and the packing is covered from the outside by a joint clamp. It is adapted to be fastened to the flange and the second flange.

[0008]

[Action]

 The connection structure of the concrete pressure-feeding pipe in this invention makes it possible to hold these (integrated) connection by inserting the tip of the second concrete pressure-feeding pipe into the opening end of the first concrete pressure-feeding pipe. Therefore, it is possible for one operator to perform these integration work, and it is easy for the same operator to attach packing to joints of flanges and joint clamps while maintaining the integrated holding state. And enable rapid implementation.

[0009] According to such an integrated holding structure, the fresh concrete and water are sealed at the insertion portions of both concrete pressure feeding pipes, and by these insertions, the positional deviation from the central axis of both concrete pressure feeding pipes is prevented. By ensuring that the sealability and the rigidity and strength of the connection part are ensured by eliminating all occurrences and sealing the flange part by packing.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the connection structure of the concrete pressure feed pipe of the present invention. In the figure, 11 is a first concrete pressure feed pipe such as a straight pipe or a bent pipe made of lightweight steel pipe and the like, near the open end thereof. A first flange 12 is projectingly provided on the outer periphery of the.

Further, 13 is a second concrete pressure-feeding pipe, and a second flange 14 joined to the first flange 12 is projectedly provided on the outer periphery of the tip end portion thereof. Reference numeral 15 denotes a cutout portion formed by expanding the inner circumference of the tip end portion of the second concrete pressure feed pipe 13, and the shape and size of the cutout portion 15 are such that the above-mentioned open end of the first concrete pressure feed pipe 11 ( It is supposed to fit the tip).

Therefore, in this receiving and engaging state, the first concrete pressure-feeding pipe 11 is horizontally supported by the second concrete pressure-feeding pipe 13, and at this time, the opening of the first concrete pressure-feeding pipe 11 is opened. The end face is abutted against the deepest end of the cutout portion in the second concrete pumping pipe 13, and the first flange 2 and the second flange 4 are joined.

Further, 16 is a ring-shaped packing for sealing made of rubber or the like which covers the outside of the joined first flange 2 and the second flange 4, that is, at least the outer peripheral portion and the outer portion, and 17 is It is a joint clamp with a U-shaped cross section that covers the outside of this packing and securely connects and holds both flanges 2 and 4.

As shown in FIGS. 2 and 3, the joint clamp 17 includes high-strength half ring members 19 and 20 pivotally supported by a support shaft 18. Of these, a rotating piece 21 is pivotally supported by a shaft portion 25 at one end of the half ring member 20, and at the end of the rotating piece 21, a base end of a screw rod 23 having a locking nut 22 screwed into its tip portion is attached. It is pivotally supported.

An engaging notch 24 that accommodates the shaft portion of the screw rod 23 and engages the locking nut 22 is provided at one end of the other half ring member 19. The joint clamp 17 is an example applicable to the present invention, and not limited to such shape and size, a well-known one can be arbitrarily applied.

Then, the concrete pumping pipes 11 and 13 having such a configuration are assembled in the following manner. First, insert the opening end of the first concrete pumping pipe 11 into the notch 15 provided in the opening end of the second concrete pumping pipe 13, and hit this opening end against the innermost part of the notch 15. To do.

As a result, the first concrete pressure-feeding pipe 11 and the second concrete pressure-feeding pipe 12 are closely joined at their respective open ends, and the others are coaxially and integrally supported. In other words, such integrated support can be performed by one worker only by inserting the respective open ends of the concrete pumping pipes 11 and 13 into each other as described above.

At this time, the ring-shaped packing 16 is fitted into either end of the first or second concrete pumping pipe, and then the above-mentioned open end is joined, and then the packing is joined. Move to a different position.

In the above case, the outer portions of the flanges 2 and 4 of the concrete pumping pipes 11 and 13 in the integrally supported state, that is, the outer peripheral surface and the side face, and a part of the outer periphery of the ends of the concrete pumping pipes 11 and 13 are fixed. The worker may attach the ring-shaped packing 16 made of rubber or the like so as to cover it. It is optional to use the packing 16 having a cross-sectional shape that matches the shape of the flanges 12 and 14 in advance.

Subsequently, a joint clamp 17 having a U-shaped cross section is attached so as to cover the outside of the packing 16, that is, the outer circumference and side surfaces of the packing 16 and a part of the outer circumference of the ends of the concrete pumping pipes 11 and 13. To do.

Since the joint clamp 17 is divided into two half ring members 19 and 20 which can be opened and closed centering around the support shaft 18 as described above, these are opened to open the outer periphery of the packing 16. To cover it.

Further, subsequently, these half ring members 19 and 20 are closed, and the rotary piece 21 pivotally supported at the end of the half ring member 20 is rotated toward the other half ring member 19 side while the screw rod 23 is rotated. The shaft portion is guided into the engaging cutout portion 24 at the end of the half ring member 19, and the bottom portion of the locking nut 22 is engaged with the engaging cutout portion 24.

As a result, the half ring members 19 and 20 are connected to each other to form a ring shape as a whole, and hold the packing 16 under pressure. In this state, it is considered that the sealing property of the packing 16 is usually insufficient. Therefore, by screwing the locking nut 22 into the screw rod 23, the half ring members 19 and 20 are closed, Tighten the packing 16 so as to obtain a sufficient sealing property. The above-mentioned operator operates the joint clamp.

Thus, the above-mentioned two concrete pumping pipes 11 and 13 can be connected by a single operator by operating them with both hands or one hand, and at the same time, a sufficient watertight effect can be achieved, and this can be easily performed. It can be realized quickly.

FIG. 4 is a cross-sectional view showing a concrete pumping pipe connection structure according to another embodiment of the present invention. In the figure, the first and second concrete pressure-feeding pipes 11 and 13 are the same as those in the embodiment of FIG. 1, but the difference is in the opening of the first concrete pressure-feeding pipe. That is, the first concrete pumping pipe 11 is the same as that in the case of FIG. 1, except that the portion corresponding to the notch on the inner circumference of the tip end of the second concrete pumping pipe is the first concrete pumping pipe. A tubular joint plate 28 having a flange 27 joined to the flange 12 of the pipe 11 at its tip is welded to form the enlarged diameter portion 26 into which the tip of the first concrete pumping pipe 11 is fitted. Especially.

The ring-shaped packing 16 for joining the other flanges, the joint clamp 17, and the joining relationship between them are the same as those in the first embodiment.

[0027]

[Effect of device]

 As described above, according to the present invention, the first concrete pumping pipe having the first flange projecting from the outer periphery near the opening end and the tip portion on the outer periphery of the opening end of the first concrete pumping pipe. A second flange that is inserted and abuts on the outer circumference of the tip is brought into contact with the first flange to be held by the first concrete pumping pipe, and A second concrete pressure-feeding pipe having an inner peripheral surface and a uniform inner peripheral surface is provided, and a ring-shaped packing is provided on the abutted first flange and second flange so as to cover them from the outside. Since it was attached and the packing was covered from the outside by a joint clamp, and this was fastened to the above-mentioned first flange and second flange, the joint work of two concrete pumping pipes was performed by one person. Reliably and quickly, yet the effect that can be economically implemented obtained by.

[Brief description of drawings]

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

FIG. 2 is a side sectional view showing a connection structure in FIG.

FIG. 3 is a perspective view of the joint clamp shown in FIG.

FIG. 4 is a cross-sectional view showing a concrete pressure pipe connection structure according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a connection structure for a conventional concrete pumping pipe.

[Explanation of symbols]

 11 First Concrete 12 First Flange 13 Second Concrete 14 Second Flange 16 Packing 17 Joint Clamp

Claims (1)

[Scope of utility model registration request] 1. A first concrete pumping pipe having a first flange projecting from the outer periphery near the opening end, and a tip portion inserted into the outer periphery of the opening end of the first concrete pumping pipe, and the tip. A second concrete pressure pipe held by the first concrete pressure pipe by abutting a second flange projecting on the outer periphery of the portion to the first flange; And a ring-shaped packing attached to the flange and the second flange so as to cover the flange from the outside, and a joint clamp that covers the packing from the outside and tightens the first flange and the second flange. Connection structure for concrete pumping pipe.