Slurry scattering prevention device for slurry pressure transport pipes

Abstract

To provide such a neat appearance that normally a sheet material is in close contact with a transport pipe as much as possible, while slurry such as ready-mixed concrete is prevented from scattering by reducing the impact when the transport pipe bursts.SOLUTION: After a sheet material 3 is wrapped around a transport pipe 2 to cover it, the transport pipe 2 is fixed with fastening belts 5 at a plurality of locations spaced apart at regular intervals in the pipe axis direction. Fixing of the fastening belts 5 at this time is performed by a method / mode in which after forming a ring state C1 with a circumference sufficiently longer than the outer circumference of the transport pipe 2 and fixing it with a buckle portion 8, a part of the ring C1 is short-circuited to form a ring state C2 with a shorter circumferential length, and fixed with a binding band 11 so as to maintain this state. When a force is applied to the fastening belt 5 in this state in a direction to expand the diameter of the ring C2, when the fixed limit is exceeded, the binding band 11 breaks before being fixed by the buckle portion 8, and the diameter of the fastening belt 5 expands from the ring state C2 to the ring state C1.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a slurry scattering prevention device in a slurry pressure transport pipe, such as a ready-mixed concrete pressure transport pipe that pressure-transports ready-mixed concrete from a concrete pump truck into a specified formwork. [Background technology]

[0002] Ready-mixed concrete (referred to as "ready-mixed concrete" in this book) delivered to the building / construction site by an agitator truck is 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 for pumping ready-mixed concrete must be highly durable.

[0003] However, ready-mixed concrete contains aggregates such as gravel, which wear away the inner walls of the transport pipes, so there was a natural limit to its durability. Also, blockages in the pipes could cause a temporary rise in internal pressure, which could lead to the pipes bursting. When the pipes burst, the ready-mixed concrete that had been pumped under high pressure would gush out all at once, scattering all over the surrounding area.

[0004] Therefore, in the past, measures were taken to prevent the scattering of ready-mixed concrete in the event of a transport pipe bursting by covering the pipe with a protective sheet and fixing it at appropriate points, or to protect against unexpected breakage of the pipe by covering the entire pipe with a tubular cover as described in Patent Document 1. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Microfilm of Utility Model Application No. 53-5135 (Utility Model Application No. 54-109324) Summary of the Invention [Problem to be solved by the invention]

[0006] 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, simply covering and securing the transport pipe with a protective sheet may not be able to withstand the pressure in the event of a transport pipe rupture, and there is a risk that the ready-mixed concrete will break through the protective sheet and splash into the surrounding area.

[0007] In this case, it is 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 a sheet material that can withstand a pressure of 5 MPa or more. It is also possible to wrap the sheet material multiple times or increase its thickness, but this increases the weight of the entire sheet material, and in particular when it is attached to the transport pipe of a boom-type complete pump vehicle, the weight of the entire boom increases, which may put a strain on the joints and supports and have a negative effect on stability during operation.

[0008] On the other hand, when the cover is molded into a tube shape as described in Patent Document 1, it is necessary to mold it into a special shape, and when attaching it, the transport pipe must be inserted from the end of the cover, which makes the work complicated, especially when it is attached to an existing transport pipe.

[0009] Furthermore, the tube-shaped transport pipe cover described in Patent Document 1 has its ends tied with rubber rings or drawstrings, but the middle part is formed to be slightly bulged in advance with some slack. This is to contain 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, since it is always in a loose state, it looks bad, gets in the way of work, and flap when blown by strong winds. In particular, concrete pump trucks run on general roads with the cover attached to the transport pipe to the site, so there is a risk of it being difficult to run if blown by strong winds. Furthermore, there is a risk that the cover will flap in the wind, causing deterioration due to wear and tear, and shortening the life of the cover.

[0010] 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.

[0011] The present invention has been made to solve such problems, and has an object to provide a slurry scattering prevention device for a transport pipe for pressure-transporting a 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 mitigate the impact in the event of a transport pipe rupture, thereby preventing the slurry from scattering. [Means for solving the problem]

[0012] 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 the pipe and fixing the sheet material at a plurality of points along the pipe axis direction with fastening belts, a first fastening means capable of 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 capable of forming the fastening belt into a second circular state having a shorter circumferential length by short-circuiting and fastening a part of the first fastening means; 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.

[0013] According to the present invention, the sheet material is wrapped around the transport pipe to cover it, and then fastened at multiple locations along the pipe axis with fastening belts to attach it to the transport pipe, so it can be attached to an existing transport pipe as a retrofit. In addition, since the present invention wraps the sheet material around the transport pipe and fastens it at multiple locations with fastening belts, the sheet material can be attached to the transport pipe as closely as possible, giving it a neat appearance. This makes it possible to prevent loose sheet material from interfering with work or flapping in strong winds.

[0014] On the other hand, in the event of a transport pipe rupture, 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 fastening belt is released from the fixed state of the second fastening means. 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.

[0015] 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 circumferential length of the transport pipe, which relaxes the winding of the sheet material and creates room for the diameter to expand. As a result, a space is created between the sheet material and the transport pipe, and the leaked slurry is contained therein. This prevents the slurry from scattering.

[0016] In the present invention, when a force of a certain degree or more acts on the fastening belt in the second circular state in the radial expansion direction, the fastening belt is released from the second fastening means, and the second circular state expands to the first circular state. The specific configuration and specific means for releasing the fastening belt by the second fastening means are not important. For example, when the fastening belt by the second fastening means is engaged, the fastening belt may be configured to be released by disengaging the fastening belt, or the second fastening means may be configured to be fragile so that the fastening belt is released by breaking the fastening belt. In addition, the present invention includes not only the case where the fastening belt is released at the location where the direct operation for fastening is actually performed, but also the case where the fastening belt is released at a location other than the location. In other words, the fastening belt may be configured so that the second circular state cannot be maintained as a whole when the fastening belt by the second fastening means is released.

[0017] In the present invention, "restraint" includes not only a so-called tightly bound state, but also a looser state. The degree to which the sheet material is restrained by the fastening belt in the second circular state is arbitrary.

[0018] 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, when the sheet material is formed in a rectangular shape in a flat developed state, if the sheet material is wound around the transport pipe with its longitudinal direction aligned with the axial direction of the transport pipe, the length in the lateral direction perpendicular to the longitudinal direction can be configured to be longer than the circumferential length of the first annular state.

[0019] In general, when the second fixing means is released and the fastening belt is expanded to the first annular state, the sheet material wound around the transport pipe loosens and expands in diameter, but the room for expansion is limited to the range 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 sheet material also loosens and expands, but in the above-mentioned configuration, even if the sheet material loosens, there is an overlap portion in the sheet material, and this overlap portion can prevent the slurry from scattering.

[0020] In one preferred embodiment of the present invention, a plurality of grommets may be provided on one edge of the sheet material. In this case, the grommets are preferably provided on the outermost edge of the sheet material so as to be 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.

[0021] 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 partially loosen or come undone, 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.

[0022] 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 surface thereof, and may be wrapped around the transport pipe with the cushion layer facing inward.

[0023] In this case, the sheet material is wrapped around the transport pipe in a relatively tight fit, and when the transport pipe bursts, 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 burst. The cushion layer also provides soundproofing and heat insulation effects. Effect of the Invention

[0024] As described above, according to the present invention, by devising a method and manner of fixing the fastening belt, part of the pressure energy in the event of a transport pipe rupture is consumed in releasing the second fixing means, while releasing the second fixing means creates a space between the sheet material and the transport pipe to accommodate the slurry, so that the synergistic effect of both prevents the slurry from scattering.

[0025] 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 work from being hindered by loose sheet material or the sheet material flapping about in strong winds.

[0026] Furthermore, since the present invention is attached to a transport pipe by wrapping the sheet material around the transport pipe and fastening it at multiple points along the axial direction of the pipe with fastening belts, it can be attached to an existing transport pipe as a retrofit. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view of a ready-mixed concrete scattering prevention device according to an embodiment. [Diagram 2] 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. [Diagram 3] FIG. 4 is a plan view of a fastening belt used in the embodiment. [Figure 4] An enlarged view of the fastening portion of the fastening belt in FIG. [Diagram 5] FIG. [Figure 6]5A to 5C are explanatory diagrams showing a procedure for fixing (fastening) the fastening belt in the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0029] FIG. 1 is an oblique 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 secured at multiple points along the pipe axis with fastening belts 5.

[0030] 《1》Transport pipe There are various types, sizes, and dimensions of ready-mixed concrete pressure-transporting transport pipes 2 in terms of diameter, length, wall thickness, etc., but the transport pipes 2 to which this embodiment is applied are not limited to these types, sizes, and dimensions. Also, ready-mixed concrete pressure-transporting transport pipes 2 include 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.

[0031] 2. Sheet material 2(A), the sheet material 3 is rectangular in shape when laid out in a plane, and has a two-layer structure consisting of an outer sheet material 3a and an inner cushion layer 3b. On one long edge of the sheet material 3, oval grommets 4 are provided in a row at regular intervals.

[0032] Among these, the outer sheet material 3a is also formed in a rectangular shape when developed in a plane, and the size and dimensions thereof can be various depending on the size of the transport pipe 2. As an example, the size is 700 to 1200 mm in length and 2940 mm in width. In this embodiment, the sheet material 3 is wrapped around the transport pipe 2 with the longitudinal direction (direction along the long side) of the sheet material 3 aligned with the axial direction of the transport pipe 2. In addition, the length in the short side direction (length of the short side) 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).

[0033] The sheet material used for the outer sheet material 3a is preferably one having 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 the JIS L 1096 A method (strip method), an elongation rate of 20% or more in both the vertical and horizontal directions according to the JIS L 1096 A method (strip method), and a tear strength of 80N or more in both the vertical and horizontal directions according to the JIS L 1096 A method (single tongue method) is preferably used. 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 peripheral edges of the outer sheet material 3a, particularly the edge on the side where the eyelets 4 are provided, are subjected to end treatment such as overlapping and sewing of fabric for reinforcement.

[0034] The inner cushion layer 3b is also formed in a rectangular shape when developed in a plane. The material is not particularly limited as long as it has cushioning properties, and an example is a foam made of ethylene-propylene rubber. The thickness of the inner cushion layer 3b is also not particularly limited, and an example is 3 to 5 mm.

[0035] 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)). The means for integrating the two is not particularly limited. In this embodiment, the inner cushion layer 3b is provided on the outer sheet material 3a except for the edge portions on each side, and the sheet material 3 is thus configured as a sheet material with a cushion layer having the cushion layer 3b on one surface.

[0036] 3. Fastening belt 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 strip 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. Therefore, the fastening belt 5 is formed to be sufficiently longer than the outer periphery of the transport pipe 2.

[0037] The belt body 6 is provided with two sets of two holes, that is, four holes 7a to 7d in total. The purpose and function of the holes 7a to 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 normal trouser waist belt.

[0038] 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, whereby 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 be slidable 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.

[0039] 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 passed through the first gap S1 between the frame body 9 and the hooking portion 10, and then folded back so as to embrace the hooking portion 10 inward, and passed through the second gap S2 between the frame body 9 and the hooking portion 10. In this way, the fastening belt 5 can be fixed at any position, and a ring of the desired circumferential length can be formed (see Figures 3 to 5 for the above).

[0040] 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 fastening by the buckle portion 8, the following type of fastening is also used in combination.

[0041] 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 ring state C1), as shown in FIG. 6(B), a part of the circular ring C1 is short-circuited to form a circular ring 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 ring 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 hole 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 ring state C2 with a shorter circumference than the initial circular ring state C1 formed when the fastening belt 5 is fixed only by the buckle portion 8.

[0042] That is, 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 the fastening belt 5 is 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 the fastening belt 5 by the cable tie 11 corresponds to the "second circular state" of the present invention. The buckle portion 8 corresponds to the "first fastening means" of the present invention, and the cable tie 11 corresponds to the "second fastening means" of the present invention.

[0043] 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 expanding the diameter of the ring C2, at a certain stage, i.e., when a force equal to or greater than a certain level is applied in the expanding direction, the cable tie 11 breaks before it is fixed by the buckle portion 8.

[0044] 5. Method of using the present embodiment The ready-mixed concrete scattering prevention device 1 of this 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 this 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.

[0045] After the sheet material 3 is wrapped around the transport pipe 2 in this manner to cover the entire transport pipe 2, the fastening belts 5 are wound around and fixed at a plurality of locations at regular intervals along the axial direction of the transport pipe 2. At this time, the fastening belts 5 are inserted through the eyelets 4 and then fixed. The intervals at which the fastening belts 5 are fixed are not particularly limited, but are set to 50 cm in this embodiment.

[0046] As described above, the fastening belt 5 is fixed by the buckle portion 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 so as 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 portion 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 the second ring state C2 binds the sheet material 3 tightly. Then, the cable tie 11 is hung between the hole portion 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 Figs. 4 and 5).

[0047] As described above, a normal ready-mixed concrete pumping operation 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 fixing it at multiple points along the pipe axis direction 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 fixes it at multiple points with the fastening belt 5, so the sheet material 3 can be attached to the transport pipe 2 as closely as possible to give it a neat appearance. This makes it possible to prevent the loose sheet material 3 from interfering with the work or flapping in a strong wind.

[0048] On the other hand, when the transport pipe bursts, the fastening belt 5 receives a force in the radial direction due to the pressure of the ejected fresh concrete. When this force exceeds a certain limit, the cable tie 11 breaks, and the fastening belt 5, which was 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 leaking from the transport pipe 2 is contained here. This prevents the fresh concrete from scattering.

[0049] In addition, when the cable tie 11 breaks, the pressure of the ready mixed concrete also acts to cause the sheet material 3 to swell, allowing the worker to easily notice the rupture of the transport pipe 2. Even if the worker is late in noticing, the pressure of the ready mixed concrete once contained inside the sheet material 3 has decreased, so even if it leaks out, it will be discharged slowly through the gaps in the loosened sheet material and will not be scattered forcefully over a wide area.

[0050] Furthermore, in the sheet material 3 of this embodiment, the length of the short side is formed sufficiently longer than the overall length of the fastening belt 5, so 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 allowed by the first annular state C1, the winding does not come completely undone, and there is still an overlapping portion in the sheet material 3. This overlapping portion also prevents the fresh concrete from scattering.

[0051] In addition, in this embodiment, the fastening belt 5 is inserted through the eyelets 4 to be fixed to the sheet material 3, so that it is possible to prevent the fastening belt 5 from shifting laterally in the axial direction of the transport pipe 2 due to the impact caused when the transport pipe bursts. 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.

[0052] Furthermore, in this embodiment, the sheet material 3 is wrapped around the transportation pipe 2 with the cushion layer 3b on the inside, so that the sheet material 3 is wrapped around the transportation pipe 2 in as close contact as possible, and when the transportation pipe bursts, the cushion layer 3b is compressed to form a space for containing ready-mixed concrete between the outer sheet material 3a and the transportation pipe 2. This makes it easier to achieve the two objectives of a neat appearance and shock mitigation when the transportation pipe bursts. The cushion layer 3b also provides soundproofing and heat insulation effects.

[0053] <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 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.

[0054] In the above embodiment, the sheet material is provided with grommets, but the provision of grommets is not essential in the present invention. 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 elliptical shape, but the shape of the grommets is not limited to an elliptical shape.

[0055] 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) of the sheet material is aligned with the axial direction of the transport pipe and the sheet material is wound around the transport pipe, but the method of winding the sheet material is not limited to such a method or aspect, and the sheet material may be wound, for example, to form a spiral.

[0056] 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 a cable tie. Furthermore, the fastening using the buckle portion is not limited to that in the above embodiment.

[0057] In the above embodiment, the fastening belt is fastened in the order of first fastening the buckle portion to form the first circular state, and then the second circular state is formed by short-circuiting a portion of the first circular state and fastening with a cable tie, but 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 first fastening the first fastening means to form the first circular state, then shorting a portion of the first circular state and fastening with the second fastening means, and it does not matter whether the first fastening means or the second fastening means is fastened first when actually fastening the sheet material.

[0058] Furthermore, the first and second fixing means of the present invention are not limited to a single fixing means, and may each be composed of a plurality of fixing means. For example, in the above embodiment, a single cable tie is used as the second fixing means, but instead, the second circular state may be maintained by a plurality of fixing means (the specific configuration of which does not matter).

[0059] In the above embodiment, the fastening belt is fixed in two stages, that is, by the buckle and by the cable tie, but it may be fixed in three or more stages. In this case, there are three or more corresponding circular states depending on the difference in the 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.

[0060] In the above embodiment, a transport pipe for pumping ready-mixed concrete (a transport pipe for pumping ready-mixed concrete) has been used as an example, but the present invention can be similarly 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. [Explanation of symbols]

[0061] 1. Fresh concrete scattering prevention device (slurry scattering prevention device) 2 Transport pipe 3 Sheet material 3a Outer sheet material 3b Inner cushion layer 4 Eyelets 5 Fastening Belt 6 Belt body 7a~7d Hole 8 Buckle portion (first fixing means) 9 Frame 10 Latch part 11 Cable tie (second fixing means) C1 First circular state C2 Second circular state R Surplus part S1 First gap S2 Second gap

Claims

1. A slurry scattering prevention device for a slurry pressure-transporting transport pipe, the device being formed by wrapping a sheet material around a slurry pressure-transporting transport 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 fixing 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 fixing 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 fixing a part of the first fixing 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.

2. 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.

3. 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.

4. 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.

Images