JP7656492B2 - Slurry scattering prevention device for slurry pressure transport pipes - Google Patents

Description

The present invention relates to a slurry scattering prevention device for slurry pressure transport pipes, such as a ready-mixed concrete pressure transport pipe that pressure-transports ready-mixed concrete from a concrete pump truck into a specified formwork.

Ready-mixed concrete (referred to as "ready-mixed concrete" in this book) is transported to the building site by an agitator truck, then pumped by a concrete pump truck and poured into the designated formwork. Ready-mixed concrete is generally pumped under high pressure, so the transport pipes used to pump the ready-mixed concrete must be highly durable.

However, ready-mixed concrete contains aggregates such as gravel, which wear away the inner walls of the transport pipes, naturally limiting its durability. Also, blockages in the pipes can cause a temporary rise in internal pressure, which can lead to the pipes bursting. When a transport pipe bursts, the ready-mixed concrete that was being pumped under high pressure gushes out all at once, scattering all over the surrounding area.

Therefore, in the past, measures were taken to prevent the scattering of ready-mixed concrete in the event of a transport pipe rupture by covering the transport pipe with a protective sheet and fixing it at appropriate points, or to protect against the unexpected breakage of the transport pipe by covering the entire transport pipe with a tubular cover as described in Patent Document 1.

Microfilm of Utility Model Application No. 53-5135 (Utility Model Application No. 54-109324)

However, according to the inventors' research, in the event of a transport pipe rupture, there are cases in which the pressure inside the pipe suddenly rises to 5 MPa or more. Therefore, if the transport pipe is simply covered and secured in place with a protective sheet, the sheet may not be able to withstand the pressure in the event of a transport pipe rupture, and the ready-mixed concrete may break through the sheet and splash into the surrounding area.

In this case, it would be possible to use a high-strength sheet material instead of the curing sheet, but high-strength sheet materials are generally expensive, and it is not necessarily easy to find sheet material that can withstand pressures of 5 MPa or more. It would also be possible to wrap the sheet material multiple times or increase its thickness, but this would increase the weight of the entire sheet material, and particularly when it is attached to the transport pipe of a boom-type complete pump vehicle, the weight of the entire boom would increase, which could put strain on the joints and supports and have a negative effect on stability during operation.

On the other hand, if the cover is molded into a tube shape as described in Patent Document 1, it must be molded into a special shape, and when attaching it, the transport pipe must be inserted from the end of the cover, making the work complicated. This is particularly noticeable when attaching it to an existing transport pipe.

Furthermore, the tube-shaped transport pipe cover described in Patent Document 1 has its ends tied tightly with rubber rings or drawstrings, but the middle part is formed to be slightly bulged with some slack. This is to accommodate the ready-mixed concrete that spurts out when the transport pipe bursts, and is very important in preventing the ready-mixed concrete from scattering. However, because it is always loose, it looks bad, gets in the way of work, and flaps around in strong winds. In particular, concrete pump trucks travel on public roads with the cover still attached to the transport pipe to the site, so there is a risk of it being difficult to travel if the truck is blown around by strong winds. Furthermore, there is a risk that the cover will flap around in the wind, causing deterioration due to wear and tear, and shortening the cover's lifespan.

The above problems can occur not only when pumping ready-mixed concrete, but also when pumping slurries such as mortar, cement milk, grout, and muddy water.

The present invention was made to solve such problems, and aims to provide a slurry scattering prevention device for a transport pipe for pumping slurry such as ready-mixed concrete, which has a sheet material that is relatively tightly attached to the transport pipe under normal conditions, giving it a neat appearance, but which can also cushion the impact and prevent the slurry from scattering in the event of a transport pipe rupture.

In order to achieve the above object, the present invention is characterized by the following configuration.
That is, the present invention is a slurry scattering prevention device for a slurry pressure-transporting transport pipe, which is formed by wrapping a sheet material around a slurry pressure-transporting transport pipe to cover it and fixing the sheet material at multiple points along the pipe axis direction with fastening belts,
a first fastening means for forming the fastening belt into a first circular state having a circumferential length longer than the outer circumferential length of the transport pipe, and a second fastening means for forming the fastening belt into a second circular state having a shorter circumferential length by short-circuiting a part of the first fastening means and fastening the first fastening belt,
The sheet material is normally restrained by the second circular fastening belt,
The present invention is characterized in that, when a force of a certain level or more acts in the radial expansion direction on the fastening belt in the second circular state, the fixation by the second fixing means is released and the second circular state expands in diameter to the first circular state.

According to the present invention, the sheet material is wrapped around the transport pipe to cover it, and then attached to the transport pipe by fastening it at multiple points along the pipe axis with fastening belts, so it can be retrofitted to existing transport pipes. In addition, because the present invention wraps the sheet material around the transport pipe and then fastens it at multiple points with fastening belts, the sheet material can be fitted as closely as possible to the transport pipe, giving it a neat appearance. This prevents loose sheet material from interfering with work or flapping about in strong winds.

On the other hand, when the transport pipe bursts, the pressure of the ejected slurry causes the fastening belt to receive a force in the radial direction, and when this force exceeds a certain limit, the fixed state of the second fixing means is released. As a result, the fastening belt, which was in the second circular state with a short circumference, expands in diameter to the first circular state with a longer circumference, and the sheet material, which was wound relatively tightly up until that point, relaxes and expands to the range allowed by the first circular state.

In this way, in the present invention, when the transport pipe bursts, part of the pressure energy at that time is consumed to release the second fixing means, which first alleviates the impact. Then, when the second fixing means is released, the fastening belt expands in diameter to a first annular state with a circumferential length longer than the outer periphery of the transport pipe, which also relaxes the winding of the sheet material, creating room for further expansion. As a result, a space is created between the sheet material and the transport pipe, and the leaked slurry is contained here. This prevents the slurry from scattering.

In the present invention, when a force of a certain amount or more acts on the fastening belt in the second annular state in the radial expansion direction, the fastening by the second fastening means is released and the second annular state expands to the first annular state, and the specific configuration and specific means for releasing the fastening by the second fastening means are not important. For example, when the fastening by the second fastening means is an engagement, the fastening may be configured so that the engagement is released and the fastening is released, or the second fastening means itself may be configured so that the fastening is released by breaking. In addition, this includes not only the case where the fastening is released at the location where the direct operation for fastening has actually been performed, but also the case where the fastening is released at a location other than that location. In other words, it is sufficient that the second annular state cannot be maintained as a whole when the fastening by the second fastening means is released.

In this invention, "restraint" includes not only a tightly bound state, but also a looser binding state. The degree to which the sheet material is restrained by the fastening belt in the second circular state is up to the discretion of the user.

In one preferred embodiment of the present invention, the length from the innermost end to the outermost end of the winding when the sheet material is wound around the transport pipe can be configured to be longer than the circumferential length of the first annular state. For example, if the sheet material is formed in a rectangular shape when developed in a plane, and is wound around the transport pipe with its longitudinal direction aligned with the axial direction of the transport pipe, the length in the short direction perpendicular to the longitudinal direction can be configured to be longer than the circumferential length of the first annular state.

In general, when the second fixing means is released and the fastening belt is expanded to the first annular state, the winding of the sheet material wound around the transport pipe relaxes and expands, but the room for expansion is limited to the extent permitted by the fastening belt in the first annular state. Any further expansion of the sheet material is prevented by the fastening belt in the first annular state. In this way, when the second fixing means is released and the fastening belt is expanded to the first annular state, the winding of the sheet material also relaxes and expands, but in the above configuration, even if the winding is loose, there will be an overlapping portion of the sheet material, and this overlapping portion can prevent the slurry from scattering.

In one preferred embodiment of the present invention, multiple grommets may be provided on one edge of the sheet material. In this case, it is preferable that the grommets are provided on the outermost edge of the winding so that they are located on the outermost surface when the sheet material is wound around the transport pipe, and the fastening belt is inserted through the grommets and then fixed.

If the fastening belt is displaced laterally in the axial direction of the transport pipe due to the impact of the transport pipe bursting, the sheet material wrapped around the transport pipe may loosen or come undone partially, causing the slurry to splash to the outside through the gaps. However, by inserting the fastening belt through the eyelets and fixing it to the sheet material as described above, such lateral displacement of the fastening belt can be prevented.

In one preferred embodiment of the present invention, the sheet material may be a sheet material with a cushion layer having a cushion layer on one side. The sheet material may be wrapped around the transport tube with the cushion layer on the inside.

When configured in this way, the sheet material is wrapped around the transport pipe in a relatively tight fit, and in the event of a transport pipe rupture, the cushion layer is compressed to form a space between the outer sheet material and the transport pipe to accommodate the slurry, making it easier to achieve the two objectives of a neat appearance and shock mitigation in the event of a transport pipe rupture. The cushion layer also provides soundproofing and heat insulation effects.

As described above, according to the present invention, the method and manner of fastening the fastening belt are devised so that part of the pressure energy in the event of a transport pipe rupture is consumed in releasing the second fastening means, while releasing the second fastening means creates a space between the sheet material and the transport pipe to accommodate the slurry, and the synergistic effect of these two prevents the slurry from scattering.

In addition, under normal circumstances, the sheet material covers the transport pipe in a relatively tight fit due to the second fixing means, which prevents loose sheet material from interfering with work or flapping about in strong winds.

Furthermore, the present invention is attached to a transport pipe by wrapping the sheet material around the pipe and fastening it with fastening belts at multiple points along the pipe axis, so it can be retrofitted to existing transport pipes.

FIG. 1 is a perspective view of a ready-mixed concrete scattering prevention device according to an embodiment. FIG. 2A is a plan view of a sheet material used in the above embodiment, and FIG. 2B is a cross-sectional view of the same sheet material. FIG. 4 is a plan view of a fastening belt used in the embodiment. FIG. 2 is an enlarged view of the fastening portion of the fastening belt in FIG. 1; FIG. 5A to 5C are explanatory diagrams showing a procedure for fixing (fastening) the fastening belt in the embodiment.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 is a perspective view of a ready-mixed concrete scattering prevention device 1 according to an embodiment of the present invention, showing a state in which a sheet material 3 is wrapped around a ready-mixed concrete pressure transport pipe 2 to cover the entire transport pipe 2 and fixed at multiple points along the pipe axis direction with fastening belts 5.

<<1>> Transport Pipe There are various types, sizes, and dimensions of transport pipes 2 for pumping ready-mixed concrete in terms of diameter, length, wall thickness, etc., but the transport pipes 2 to which this embodiment is applied are not limited to their types, sizes, and dimensions. In addition, there are two types of transport pipes 2 for pumping ready-mixed concrete: those that are mainly installed on the ground and those that are installed on the boom part of a concrete pump truck, and the ready-mixed concrete scattering prevention device 1 of this embodiment can be applied to either of them. In the following, no distinction is made between the two, and they will be simply referred to as transport pipes.

2(A), the sheet material 3 is a rectangular sheet material in a flat developed state, and has a two-layer structure consisting of an outer sheet material 3a and an inner cushion layer 3b. Oval grommets 4 are provided in a row at regular intervals on the edge of one long side of the sheet material 3.

Of these, the outer sheet material 3a is also formed in a rectangular shape when developed in a plane, and its size and dimensions can vary depending on the dimensions of the transport pipe 2. As an example, it is 700 to 1200 mm long and 2940 mm wide. In this embodiment, the sheet material 3 is wrapped around the transport pipe 2 with its longitudinal direction (direction along the long side) aligned with the axial direction of the transport pipe 2. In addition, the length of the short side (length of the short side), which is perpendicular to the longitudinal direction, is formed to be sufficiently longer than the overall length of the fastening belt 5 (the technical significance of this point will be described later).

The sheet material used for the outer sheet material 3a is preferably one that has excellent weather resistance, heat insulation, and waterproof properties, such as tent material or tent fabric used for tent warehouses and truck hoods, but is not limited thereto. The material of the outer sheet material 3a is not particularly limited, but an example is a synthetic resin reinforced fiber sheet made of a polyester base fabric coated with polyvinyl chloride. Furthermore, the mechanical properties of the outer sheet material 3a are not particularly limited, but a fabric having a tensile strength of 1300N/3cm or more in both the vertical and horizontal directions according to JIS L 1096 A method (strip method), an elongation rate of 20% or more in both the vertical and horizontal directions according to JIS L 1096 A method (strip method), and a tear strength of 80N or more in both the vertical and horizontal directions according to JIS L 1096 A method (single tongue method) is preferable. The thickness of the outer sheet material 3a is also not particularly limited, but an example is 0.4 to 1 mm. It is preferable that the edges around the outer sheet material 3a, particularly the edge on the side where the eyelets 4 are provided, are reinforced by overlapping and sewing the fabric, or other end treatment.

The inner cushion layer 3b is also formed in a rectangular shape when developed in a flat state. There are no particular limitations on the material used, as long as it has cushioning properties, but one example is a foam made of ethylene-propylene rubber. There are no particular limitations on the thickness of the inner cushion layer 3b, but one example is 3 to 5 mm.

The sheet material 3 of this embodiment is formed by integrating the outer sheet material 3a and the inner cushion layer 3b (see FIG. 2(B)). There is no particular limitation on the means for integrating the two. In this embodiment, the inner cushion layer 3b is provided except for the edge portions of each side of the outer sheet material 3a, and the sheet material 3 is thus configured as a sheet material with a cushion layer having the cushion layer 3b on one side.

3, the fastening belt 5 of this embodiment includes a long belt body 6 and a buckle portion 8. The belt body 6 is a high-strength band-shaped body made of synthetic fiber, and the buckle portion 8 is provided at one end of the belt body 6. As will be described later, the fastening belt 5 is fastened after being wrapped around the outer periphery of the transport pipe 2 around which the sheet material 3 is wound, and therefore the fastening belt 5 is formed to be sufficiently longer than the outer periphery of the transport pipe 2.

The belt body 6 has two sets of two holes, for a total of four holes 7a-7d. The purpose and function of these holes 7a-7d will be described later. The number of holes is not limited to four, and multiple holes (more than four holes) may be provided at regular intervals, like a regular trouser waist belt.

The buckle portion 8 comprises a rectangular frame 9 and a hook portion 10 that can slide relative to the frame 9. In this embodiment, both the frame 9 and the hook portion 10 are made of metal. One end of the belt body 6 is folded back so as to embrace one side of the frame 9 inward and then sewn, so that the two are integrated and connected in a manner that allows the buckle portion 8 to swing freely. The hook portion 10 is configured to slide freely inside the frame 9 along the longitudinal direction of the belt body 6. The surface of the hook portion 10 is knurled to prevent slipping.

To fasten this fastening belt 5, the end of the belt body 6 on the side not provided with the buckle portion 8 is brought close to the buckle portion 8 to make the whole into a ring shape, and the end is inserted into the first gap S1 between the frame body 9 and the hook portion 10, and then folded back so as to embrace the hook portion 10 inward, and inserted into the second gap S2 between the frame body 9 and the hook portion 10. This allows the fastening belt 5 to be fixed at any position, and a ring of the desired circumference can be formed (see Figures 3 to 5 for the above).

<4> Fixing the Fastening Belt The circular loop thus formed is used to fasten an object, which is the normal method of using the fastening belt 5. In this embodiment, in addition to the fastening by the buckle portion 8, the following fastening method is also used in combination.

Specifically, after the fastening belt 5 is fixed by the buckle portion 8 as described above (see FIG. 6(A). At this time, the fastening belt 5 is in a circular state C1), as shown in FIG. 6(B), a part of the circular state C1 is short-circuited to form a circular state C2 with a shorter circumference. At this time, the holes 7c and 7d are included in the excess part R that was not included therein. Then, as shown in FIG. 6(C), the excess part R is folded back and superimposed on the outer periphery of the circular state C2 with a shorter circumference. At this time, the positions of the holes 7b, 7c, and 7d are almost aligned. Next, as shown in FIG. 6(D), the cable tie 11 is hung between the holes 7a and the holes 7b, 7c, and 7d and fixed. This prevents the folded back excess part R from returning to its original state, and also maintains the circular state C2 with a shorter circumference than the initial circular state C1 formed when the fastening belt 5 is fixed only by the buckle portion 8.

In other words, in this embodiment, the fastening belt 5 is fixed by the buckle portion 8, a part of the ring C1 is short-circuited to form a circular state C2 with a shorter circumference, and the fastening belt 5 is fixed by the cable tie 11 so as to maintain this state. The circular state C1 formed when fixed by the buckle portion 8 corresponds to the "first circular state" of the present invention, and the circular state C2 with a shorter circumference formed by fixing with the cable tie 11 corresponds to the "second circular state" of the present invention. The buckle portion 8 corresponds to the "first fixing means" of the present invention, and the cable tie 11 corresponds to the "second fixing means" of the present invention.

Furthermore, in this embodiment, when a force is applied to the fastening belt 5 fixed in two stages by the buckle portion 8 and the cable tie 11 in a direction that expands the diameter of the ring C2, at a certain stage, that is, when a certain amount of force or more is applied in the expanding direction, the cable tie 11 breaks before it is fixed by the buckle portion 8.

<<5>> Method of Using the Present Embodiment The ready-mixed concrete scattering prevention device 1 of the present embodiment, the components of which are configured as described above, is used as follows.
First, the sheet material 3 is wound around the transport pipe 2 so as to cover the entire transport pipe 2. The number of times of winding is not particularly limited, but is preferably in the range of more than one turn and less than two turns, and more preferably in the range of one and a half turns to one and three-quarters turns. In this embodiment, the sheet material 3 is wound around the transport pipe 2 about one and a half turns. When winding the sheet material 3, the sheet material 3 is wound around the transport pipe 2 so that the cushion layer 3b is on the inside (transport pipe side). In addition, at that time, the longitudinal direction (direction along the long side) of the sheet material 3 and the axial direction of the transport pipe 2 are aligned, and the sheet material 3 is wound around the transport pipe 2 so that the long side on the side where the eyelets 4 are not provided is the innermost end of the winding. As a result, the eyelets 4 are located at the outermost end (top surface) of the sheet material 3 and aligned along the axial direction of the transport pipe 2.

After wrapping the sheet material 3 around the transport pipe 2 in this manner to cover the entire transport pipe 2, the fastening belt 5 is wrapped around and fixed at multiple locations at regular intervals along the axial direction of the transport pipe 2. At this time, the fastening belt 5 is inserted through the eyelets 4 and then fixed. The interval at which the fastening belt 5 is fixed is not particularly limited, but in this embodiment, it is set to an interval of 50 cm.

As described above, the fastening belt 5 is fixed by the buckle 8, and then a part of the ring C1 is short-circuited to form a shorter ring state C2, and the fastening belt 5 is fixed by the cable tie 11 to maintain this state. To restate this embodiment, the fastening belt 5 is first wrapped around the transport pipe 2 covered with the sheet material 3 to form a first ring state C1 with a circumference sufficiently longer than the outer periphery of the transport pipe 2, and fixed by the buckle 8. Then, a part of the first ring state C1 is short-circuited to form a second ring state C2 with a shorter circumference. At this time, the sheet material 3 is adjusted so that it is bound tightly by the second ring state C2. Then, the cable tie 11 is hung between the hole 7a and the holes 7b, 7c, and 7d and fixed. As a result, the second ring state C2 is maintained, and the sheet material 3 is also fixed in close contact with the transport pipe 2 while still in a wound state (see Figures 4 and 5).

In this manner, normal ready-mixed concrete pumping work is performed using the transport pipe 2 equipped with the ready-mixed concrete scattering prevention device 1 of this embodiment. The ready-mixed concrete scattering prevention device 1 of this embodiment is attached to the transport pipe 2 by wrapping the sheet material 3 around the transport pipe 2 to cover it and fastening it at multiple points along the pipe axis with the fastening belt 5, so it can be attached to an existing transport pipe 2 as a retrofit. In addition, the ready-mixed concrete scattering prevention device 1 of this embodiment wraps the sheet material 3 around the transport pipe 2 and fastens it at multiple points with the fastening belt 5, so the sheet material 3 can be attached as closely as possible to the transport pipe 2 for a neat appearance. This makes it possible to prevent loose sheet material 3 from interfering with work or flapping in strong winds.

On the other hand, when the transport pipe bursts, the pressure of the ejected fresh concrete causes the fastening belt 5 to undergo a force in the radial direction of expansion. If this force exceeds a certain limit, the cable tie 11 breaks, and the fastening belt 5, which was previously in the second circular state C2 with a shorter circumference, expands to the first circular state C1 with a longer circumference. At the same time, the winding of the sheet material 3, which had been restrained until then, loosens, and expands to the range allowed by the first circular state C1. As a result, a space is created between the sheet material 3 and the transport pipe 2, and the fresh concrete that leaks from the transport pipe 2 is contained here. This prevents the fresh concrete from scattering.

In addition, when the cable tie 11 breaks, the pressure of the ready-mixed concrete also acts on the sheet material 3, causing it to swell, allowing workers to easily notice the rupture of the transport pipe 2. Even if the worker is late in noticing, the pressure in the ready-mixed concrete once contained inside the sheet material 3 has decreased, so even if it leaks out, it will be slowly discharged through the gaps in the loosened sheet material and will not be scattered forcefully over a wide area.

Furthermore, in this embodiment, the sheet material 3 is formed so that the length of its short side is sufficiently longer than the overall length of the fastening belt 5, and therefore the length of the short side of the sheet material 3 is longer than the circumference of the first annular state C1. Therefore, even if the winding of the sheet material 3 loosens and expands to the range permitted by the first annular state C1, the winding will not come completely undone, and there will still be an overlapping portion of the sheet material 3. This overlapping portion also prevents the fresh concrete from scattering.

In addition, in this embodiment, the fastening belt 5 is inserted through the eyelets 4 and fixed to the sheet material 3, so that the fastening belt 5 can be prevented from shifting laterally in the axial direction of the transport pipe 2 due to the impact of the transport pipe bursting. As a result, even if the cable tie 11 breaks, the fastening belt 5 in the first annular state C1 can evenly restrain the sheet material 3 in the axial direction, preventing the sheet material 3 from unraveling and opening over a wide area.

In addition, in this embodiment, the sheet material 3 is wrapped around the transport pipe 2 with the cushion layer 3b on the inside, so that the sheet material 3 is wrapped around the transport pipe 2 in as close contact as possible, and in the event of a transport pipe rupture, the cushion layer 3b is compressed to form a space between the outer sheet material 3a and the transport pipe 2 to accommodate the ready-mixed concrete. This makes it easier to achieve the two objectives of a neat appearance and mitigating impacts in the event of a transport pipe rupture. The cushion layer 3b also provides soundproofing and heat insulation effects.

<6> Modifications, etc. Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. In the above embodiment, a cushion layer is provided on the inside of the sheet material, but the sheet material is not limited to a sheet material with a cushion layer. In the above embodiment, the sheet material has a two-layer structure consisting of an outer sheet material and an inner cushion layer, but the sheet material of the present invention is not limited to a two-layer structure. It may have a one-layer structure or a multi-layer structure of three or more layers.

In the above embodiment, the sheet material is provided with grommets, but the provision of grommets is not essential in the present invention. Furthermore, even if grommets are provided, they may be provided on both edges, not just one edge. In the above embodiment, the grommets are formed in an oval shape, but the shape of the grommets is not limited to an oval shape.

In the above embodiment, the sheet material is formed in a rectangular shape, but the shape of the sheet material of the present invention is not limited to a rectangular shape. Also, in the above embodiment, when the sheet material is rectangular, the longitudinal direction (direction along the long side) is aligned with the axial direction of the transport pipe and the sheet material is wrapped around the transport pipe, but the method of wrapping the sheet material is not limited to such a method or aspect, and the sheet material may be wrapped, for example, to form a spiral.

In the above embodiment, the fastening belt is fixed by the buckle portion and the cable tie, but the fastening belt is not limited to this manner. Even if the fastening belt is fixed using a fastener, the type of fastener is not limited to a buckle or cable tie. Furthermore, the fastening using the buckle portion is not limited to that in the above embodiment.

In the above embodiment, the fastening belt is fastened by first fastening the buckle portion to form the first circular state, and then fastening the second circular state by shorting a portion of the first circular state with a cable tie. However, the cable tie may be fastened first, and then the buckle portion may be fastened to form the second circular state. The second circular state in the present invention may be formed by fastening the first fastening means first to form the first circular state, and then fastening the second fastening means by shorting a portion of the first circular state. It does not matter whether the first or second fastening means is fastened first when actually tying the sheet material.

Furthermore, the first and second fixing means of the present invention are not limited to a single fixing means, and may each be made up of multiple fixing means. For example, taking the second fixing means as an example, in the above embodiment, a single cable tie was used as the second fixing means, but instead, multiple fixing means (whether the specific configuration is irrelevant) may be used to maintain the second circular state.

In the above embodiment, the fastening belt is fixed in two stages, by fixing with the buckle part and fixing with a cable tie, but it may be fixed in three or more stages. In this case, there will be three or more corresponding circular states depending on the difference in circumference, and in this case, the one with the shortest circumference (the one closest to the outer circumference of the transport pipe) corresponds to the "second circular state" of the present invention, and the one with a longer circumference, for example the next longest circumference, corresponds to the "first circular state" of the present invention.

In the above embodiment, a transport pipe for pumping ready-mixed concrete (a transport pipe for pumping ready-mixed concrete) has been described as an example, but the present invention can be applied not only to transport pipes for pumping ready-mixed concrete, but also to transport pipes for pumping a wide range of slurries, such as mortar, cement milk, grout, and muddy water.

1. Device to prevent ready-mixed concrete from scattering (device to prevent slurry from scattering)
2 Transport tube 3 Sheet material 3a Outer sheet material 3b Inner cushion layer 4 Grommet 5 Fastening belt 6 Belt body 7a to 7d Hole portion 8 Buckle portion (first fastening means)
9 Frame body 10 Hanging portion 11 Cable tie (second fixing means)
C1 First circular state C2 Second circular state R Excess part S1 First gap S2 Second gap

Claims (4)

A slurry scattering prevention device for a slurry pressure-transporting pipe, the device being formed by wrapping a sheet material around a slurry pressure-transporting pipe to cover the pipe and fastening the sheet material at a plurality of locations along the pipe axis direction with fastening belts,
a first fastening means for forming the fastening belt into a first annular state having a circumferential length longer than the outer circumferential length of the slurry pressure-feeding transport pipe, and a second fastening means for forming the fastening belt into a second annular state having a circumferential length shorter than the first annular state by short-circuiting and fastening a part of the first fastening means,
The sheet material is normally restrained by the second circular fastening belt,
A slurry scattering prevention device in a slurry pressure transport pipe, characterized in that when a force of a certain amount or more is applied in the radial expansion direction to the fastening belt in the second circular state, the fixation by the second fixing means is released and the second circular state expands in diameter to the first circular state. The slurry scattering prevention device for a slurry pressure-transporting transport pipe according to claim 1,
A slurry scattering prevention device for a slurry pressure- transport pipe, characterized in that when the sheet material is wrapped around the slurry pressure-transport pipe, the length of the sheet material along the winding direction from its innermost end to its outermost end is longer than the circumference of the first circular ring state. The slurry scattering prevention device for a slurry pressure-transporting transport pipe according to claim 1 or 2,
A slurry scattering prevention device for a slurry pressure transport pipe, characterized in that when the sheet material is wrapped around the slurry pressure transport pipe, a plurality of grommets are provided on the edge on the outermost end side, and the fastening belt is inserted through the grommets and then fixed. The slurry scattering prevention device for a slurry pressure-transporting transport pipe according to any one of claims 1 to 3,
The device for preventing slurry scattering in a slurry pressure- transport pipe is characterized in that the sheet material is a sheet material with a cushion layer having a cushion layer on one side thereof, and is wrapped around the slurry pressure-transport pipe with the cushion layer facing inside.

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