Flexible hose and its restraint

Abstract

To provide a flexible hose and a restraint tool for the same capable of suppressing material separation by reducing the flow velocity of concrete flowing through a hollow of the flexible hose and eliminating the risk of breakage of constituent members due to collision of concrete.SOLUTION: Provided is a flexible hose 50 having a hose body 31 with a hollow 34 connected to a pumping pipe 17 of a concrete pump truck 10. A protrusion 44 is interposed between an outer surface 32 of the hose body 31 and a restraint tool 40 arranged around the outer surface 32. Due to tightening by the restraint tool 40, the protrusion 44 presses a part of the hose body 31 and the part protrudes into the hollow 34 to form a protrusion 35.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a flexible hose and a restraint therefor. [Background technology]

[0002] Conventionally, when pumping concrete from a high place to a low place at a construction site, concrete is pumped through a pumping pipe (or transport pipe) supported by a concrete pump truck, with interconnected arms rotating and turning.

[0003] Here, a method for pumping concrete from a high place to a low place using a concrete pump truck will be described with reference to Figure 1. The concrete pump truck 10 shown as an example in Figure 1 comprises a vehicle body 11, a first arm 12 attached to the vehicle body 11 so as to be rotatable in both the horizontal and vertical directions, a second arm 13 attached to the first arm 12 so as to be rotatable, and a third arm 14 attached to the second arm 13 so as to be rotatable, with pressure pipes 15, 16, and 17 supported on each arm, and the pressure pipes 15, 16, and 17 connected to each other so as to be rotatable while communicating with each other.

[0004] A flexible hose 20 is attached to the tip of the front pressure pipe 17, and concrete is poured into the designated pouring location through the nozzle 21 of the flexible hose 20. There are various types of concrete pump trucks, and there are many variations in the number and length of pressure pipes.

[0005] As shown in Figure 1, the concrete pumped through each pumping pipe 15, 16, 17 falls freely inside the flexible hose 20. However, during this free fall, there is a problem that the concrete is prone to separation due to differences in the particle size of the aggregate, differences in the specific gravity of water and cement, differences in the falling speed, and collisions with the inner surface of the flexible hose.

[0006] Patent Document 1 proposes a device for preventing separation of concrete chutes. This device is constructed by sequentially connecting multiple intermediate hoppers, each with a similarly flexible hose attached to its lower part, below an upper hopper equipped with a flexible hose of a predetermined length. One or more elastic tongues are attached inside the intermediate hoppers, and the free ends of the elastic tongues are arranged so that they resiliently face the center and face each other on the left and right. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 59-65165 Summary of the Invention [Problem to be solved by the invention]

[0008] According to the concrete chute separation prevention device described in Patent Document 1, concrete can be prevented from separating into concrete materials by colliding with elastic tongues that protrude toward the center of the intermediate hopper as the concrete falls freely. However, the weight of the freely falling concrete repeatedly loads the elastic tongues attached to the inside of the intermediate hopper, making the elastic tongues prone to damage, and increasing the frequency of replacement and maintenance of the elastic tongues is unavoidable.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a flexible hose and a restraining device for the same that can reduce the flow rate of concrete flowing through the hollow of the flexible hose, thereby suppressing material separation and eliminating the risk of damage to component parts due to collision with concrete. [Means for solving the problem]

[0010] In order to achieve the above object, one aspect of the flexible hose according to the present invention is as follows: A flexible hose connected to a pressure pipe of a concrete pump vehicle, the hose having a hollow hose body, a protrusion is interposed between the outer surface of the hose body and a restraining device disposed around the outer surface, When the restraining device is tightened, the protrusion presses against a part of the hose body, causing the part to protrude into the hollow, thereby forming a protrusion.

[0011] According to this aspect, for example, multiple protrusions are interposed between the outer surface of the hose body and the restraining device disposed around it, and when the multiple protrusions press against a portion of the hose body due to tightening by the restraining device, the cross section of that portion is narrowed compared to the general portion, and protrusions are formed on the inner surface of the hollow of the hose body pressed against the protrusions, so that the flow rate of the concrete can be reduced without providing a member for reducing the flow rate of the concrete inside the hollow of the hose body. Therefore, the small cross-sectional area formed in the hollow of the hose body and the multiple protrusions reduce the flow rate of the concrete and suppress material separation, while preventing the protrusions from being damaged due to collision with the concrete.

[0012] The hose body is a flexible hose made of resin such as vinyl chloride or rubber, and the restraining member and protrusions can be made of metal, hard resin, elastic material, or the like.

[0013] Because the hose is flexible, when the restraining device presses against the protrusions on the outside of the hose body, protrusions of a shape similar to the shape of the protrusions are easily formed on the hollow inner surface of the hose body.Then, when the restraining device is installed around the outer periphery of the hose body while pressing against the protrusions, the protrusions formed on the hollow inner surface of the hose body are held in place.

[0014] The length of the flexible hose is set depending on the conditions at the construction site, etc., but the arrangement of the restraining device on the outer surface of the hose body can take various forms, such as a form in which the restraining device is provided over the entire length of the hose body (a restraining device having a length that is the entire length or nearly the entire length of the flexible hose), a form in which multiple restraining devices are provided intermittently in the longitudinal direction of the hose body, a form in which the restraining device is provided on the upstream side of the hose body, or a form in which the restraining device is provided on the downstream side of the hose body.

[0015] For example, in a configuration in which a restraining device is provided along the entire length of the hose body, numerous protrusions are provided in the hollow along the entire length of the hose body, so that the flow rate of the concrete pressurized into the flexible hose is reduced throughout the entire area where it flows through the flexible hose, resulting in extremely high material separation properties.

[0016] On the other hand, in a configuration in which multiple restraining devices are provided intermittently along the longitudinal direction of the hose body, the length of the restraining devices can be reduced to, for example, 1 / 2 or 1 / 3 compared to restraining devices that run the entire length, and this can reduce the flow rate of concrete over the entire flexible hose while reducing the material cost required for the restraining devices, making this a preferable configuration from the standpoints of both material separability and economy.

[0017] In addition, in a configuration in which the restraining device is provided on the upstream side of the hose body, the flow rate of the concrete pumped into the flexible hose is reduced on the upstream side (the initial velocity of the concrete in the flexible hose is reduced) before the concrete is circulated downstream, thereby reducing the flow rate of the concrete as much as possible and preventing the concrete from separating. Furthermore, since the restraining device is provided only on the upstream side of the flexible hose, the material cost required for the restraining device can be further reduced.

[0018] Furthermore, in a configuration in which the restraining device is provided downstream of the hose body, the flow rate of the concrete flowing through the hollow of the flexible hose is reduced downstream, thereby preventing the concrete from separating. Also, since the restraining device is provided only downstream of the flexible hose, the material cost required for the restraining device can be further reduced.

[0019] In this specification, the concrete pumped by a concrete pump truck includes not only ordinary concrete, high-fluidity concrete, high-early-strength concrete, etc., but also mortar, etc., and is considered to include all cementitious materials. In addition to being used in a vertical configuration to pump concrete, flexible hoses can also be used in a horizontal configuration to pump concrete, a vertically oblique configuration to pump concrete, or a vertically and horizontally configured configuration to pump concrete.

[0020] Another aspect of the flexible hose according to the present invention is The restraining device is characterized in that the protrusions are provided on a clamping surface that clamps the hose body.

[0021] According to this aspect, by providing the protrusions on the clamping surface of the restraining device that clamps the hose body, for example, it is possible to prevent the multiple protrusions from coming apart, and since the protrusions can be manufactured as a single unit during manufacturing of the restraining device, the manufacturability of the restraining device including the protrusions is improved. Here, the restraining device and the protrusions may be molded as a single unit, or the protrusions may be fixed to the clamping surface of the restraining device by adhesive or the like.

[0022] Another aspect of the flexible hose according to the present invention is The hose is characterized in that the protrusions are provided on the outer surface of the hose body.

[0023] According to this aspect, by providing the protrusions on the outer surface of the hose body, it is possible to prevent the plurality of protrusions from coming apart, for example, by fixing the protrusions to the outer surface of the hose body by adhesive or by wrapping a band with the protrusions around the outer surface of the hose body.

[0024] In another aspect of the flexible hose according to the present invention, The restraining device is characterized in that the clamping force is adjustable.

[0025] According to this aspect, because the clamping force of the restraining device is adjustable, the shape and dimensions of the protrusions formed on the hollow inner surface of the hose body can be adjusted while adjusting the clamping force depending on the materials of both the hose body and the protrusion, and the dimensions of the hollow cross section of the hose body (the cross section narrowed by the restraining device) can be adjusted.

[0026] In another aspect of the flexible hose according to the present invention, The protrusions may be in the form of a continuous spiral or a plurality of spirals separated from one another.

[0027] According to this aspect, the protrusions have a continuous spiral shape or multiple spiral shapes that are separated from each other, so that the flow rate of concrete can be reduced while flowing along the spiral protrusions formed on the hollow inner surface of the hose body.

[0028] Another aspect of the flexible hose according to the present invention is In the region where the hose body is fastened by the restraining device, the density of the protrusions is relatively higher on the downstream side in the direction of concrete flow than on the upstream side.

[0029] According to this aspect, for example, when a long restraining device is applied, the density of the protrusions on the downstream side of the restraining device in the direction of concrete flow is relatively higher than that on the upstream side, so that the increased flow rate of the concrete can be reduced by the relatively high density protrusions on the downstream side.

[0030] Another aspect of the flexible hose according to the present invention is In the region where the hose body is fastened by the restraining device, the density of the protrusions is relatively higher on the upstream side in the direction of concrete flow than on the downstream side.

[0031] According to this aspect, for example, when a long restraining device is applied, the density of the protrusions on the upstream side of the restraining device in the direction of concrete flow is relatively higher than that on the downstream side, so that the flow rate of the concrete can be reduced on the upstream side and the subsequent flow rate can be suppressed.

[0032] Furthermore, one aspect of the flexible hose restraint device according to the present invention is A restraining device that is connected to a pressure pipe of a concrete pump vehicle and is attached to an outer surface of a hose body having a hollow to tighten the outer surface, a protrusion is provided on a clamping surface of the restraint device that clamps the hose body, When the restraining device is tightened, the protrusion presses a part of the flexible hose, causing the part to protrude into the hollow.

[0033] According to this aspect, by providing protrusions on the clamping surface that clamps the hose body, when the outer surface of the hose body is clamped, protrusions that reduce the flow rate of concrete can be formed on the hollow inner surface.

[0034] In another aspect of the restraining device for a flexible hose according to the present invention, The protrusions may be in the form of a continuous spiral or a plurality of spirals separated from one another.

[0035] According to this aspect, the protrusions have a continuous spiral shape or multiple spiral shapes that are separated from each other, so that the flow rate of concrete can be reduced while flowing along the spiral protrusions formed on the hollow inner surface of the hose body.

[0036] In another aspect of the restraining device for a flexible hose according to the present invention, The present invention is characterized in that, when the hose body is fastened by the restraining device, the protrusions are provided on the fastening surface so that the density of the protrusions is relatively higher on the downstream side of the concrete flow direction than on the upstream side.

[0037] According to this aspect, for example, when a long restraining device is applied, the density of the protrusions on the downstream side of the restraining device in the direction of concrete flow is relatively higher than that on the upstream side, so that the increased flow rate of the concrete can be reduced by the relatively high density protrusions.

[0038] In another aspect of the restraining device for a flexible hose according to the present invention, The present invention is characterized in that, when the hose body is fastened by the restraining device, the protrusions are provided on the fastening surface so that the density of the protrusions is relatively higher on the upstream side of the concrete flow direction than on the downstream side.

[0039] According to this aspect, for example, when a long restraining device is applied, the density of the protrusions on the upstream side of the restraining device in the direction of concrete flow is relatively higher than that on the downstream side, so that the flow rate of the concrete can be reduced on the upstream side and the subsequent flow rate can be suppressed. [Effects of the Invention]

[0040] As can be understood from the above explanation, the flexible hose and restraining device thereof of the present invention can reduce the flow rate of concrete flowing through the hollow of the flexible hose, thereby suppressing material separation, and can provide a flexible hose and restraining device thereof that does not pose a risk of damage to component parts due to collision with concrete. [Brief explanation of the drawings]

[0041] [Figure 1] FIG. 1 is a diagram illustrating a method for pumping concrete from a high place to a low place using a concrete pump truck. [Figure 2] FIG. 2 is a diagram showing the flexible hose according to the first embodiment together with the restraining device according to the first embodiment, in a state before assembly. [Figure 3] 1 is a side view showing an assembled state of a flexible hose according to a first embodiment. FIG. [Figure 4] 1 is a longitudinal cross-sectional view of a flexible hose according to a first embodiment in an assembled state. [Figure 5] FIG. 10 is a diagram showing a restraint device according to a second embodiment. [Figure 6] FIG. 10 is a diagram showing a restraint device according to a third embodiment. [Figure 7] FIG. 10 is a diagram showing a restraint device according to a fourth embodiment. [Figure 8] FIG. 10 is a diagram showing a restraint device according to a fifth embodiment. [Figure 9] FIG. 10 is a view showing an assembled state of a flexible hose according to a second embodiment. [Figure 10] FIG. 10 is a view showing an assembled state of a flexible hose according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0042] Hereinafter, examples of flexible hoses and restraining devices therefor according to each embodiment will be described with reference to the accompanying drawings. Note that in this specification and the drawings, substantially identical components will be designated by the same reference numerals, and redundant explanations may be omitted.

[0043] [Flexible hose and restraint according to the embodiment] An example of a flexible hose according to each embodiment and a restraining device according to each embodiment will be described with reference to Figures 2 to 10. Here, Figure 2 is a diagram showing the flexible hose according to the first embodiment together with the restraining device according to the first embodiment, showing a state before assembly, Figure 3 is a side view showing the flexible hose according to the first embodiment in an assembled state, and Figure 4 is a vertical cross-sectional view of the flexible hose according to the first embodiment in an assembled state.

[0044] The flexible hose 50 of the first embodiment is a hose that is connected to the front pressure pipe 17 of the concrete pump truck 10 shown in Figure 1 and is used to transport concrete from a high place to a low place, or to transport concrete horizontally in addition to from a high place to a low place.

[0045] The flexible hose 50 has a hose body 31 with a length that is appropriately set according to the construction conditions at the site, and a restraining device 40 that is installed on the outer surface 32 of the hose body 31 at an appropriate location on the hose body 31.

[0046] The hose body 31 is a flexible hose made of a resin such as vinyl chloride or rubber. If repeated use is not required and a new flexible hose is used each time concrete is poured, it is preferable to use a hose such as SunnyHose (registered trademark), which is widely available and has as low a production cost as possible.

[0047] On the other hand, the restraint device 40 according to the first embodiment has two half restraint devices 41 that are U-shaped in plan view, and a number of dot-shaped protrusions 44 are provided on the fastening surface 43 of each half restraint device 41.

[0048] The half-split restraint device 41 has a half-body 42 formed from metal or resin (hard resin, soft resin), etc., and a plurality of dot-shaped protrusions 44 provided on a fastening surface 43 of the half-body 42. Here, the half-body 42 and the protrusions 44 may be molded integrally, or the dot-shaped protrusions 44 may be connected to the half-body 42 by adhesion or welding.

[0049] The numerous dot-shaped protrusions 44 in the illustrated example are provided on the inner surface of the half-split restraining tool 41 with a uniform or approximately uniform density (the number of protrusions 44 within a single area).

[0050] The two half restraint devices 41 sandwich the hose body 31 with the protrusions 44 abutting against the outer surface 32 of the hose body 31, and are connected to each other to form the restraint device 40. Here, the two half restraint devices 41 can be connected in various ways, such as by gluing or welding, by being united with a band (not shown), by being united with a fastener such as a clip, or by forming one end of the two half restraint devices 41 so that they can rotate relative to each other with a hinge (not shown) and by fitting the other ends of the half restraint devices to the hose body 31 by engaging an engaging protrusion with an engaging recess.

[0051] Furthermore, the restraining device may be formed from two halves as shown in the illustration, or may be a one-piece restraining device. For example, a rubber sleeve, which is an annular elastic body, can be cited as one example. Another example is a sheet with an adhesive layer on one side, such as Gummed Tape (registered trademark), which is wrapped around the hose body. Yet another example is a sheet that can be adhered by intermolecular forces or electrostatic bonds, such as Saran Wrap (registered trademark). Among these, Gummed Tape and Saran Wrap are used when protrusions are provided on the outer surface of the hose body.

[0052] In the example shown in Figure 2, restraining devices 40 are provided in the X1 and X2 directions on the upstream and downstream sides of the hose body 31 in the direction in which concrete flows downward. By installing the two restraining devices 40 on the upstream and downstream sides, a flexible hose 50 shown in Figure 3 is formed.

[0053] As shown in the longitudinal cross section of Figure 4, restraining device 40 arranged around outer surface 32 of hose body 31 has many protrusions 44, and when restraining device 40 is tightened, multiple protrusions 44 press against a part of hose body 31, causing the cross section of this tightened part to be smaller than the general part (the cross section is tightened to a diameter φ2 smaller than the diameter φ1 of the general part).

[0054] Furthermore, protrusions 35 are formed on the inner surface 33 of the hollow 34 of the hose body 31 that is pressed by the protrusions 44. With this configuration, the flow rate of concrete can be reduced by pressure loss or the like without providing a member for reducing the flow rate of concrete on the inner surface 33 of the hollow 34 of the hose body 31.

[0055] Furthermore, because the hose body 31 is constricted by the restraining device 40, the transition region 33a, where the cross section changes from the inner diameter φ1 to the inner diameter φ2, changes smoothly, for example, in a curved shape, so that the flowing concrete flows smoothly through this transition region 33a and is sent to the small cross section region with inner diameter φ2, and then to the general section with inner diameter φ1. As a result, in this transition region where the cross section changes, the concrete does not separate into materials, and the flow rate is smoothly reduced due to the pressure loss caused by the change in cross section.

[0056] As described above, the flow rate of the concrete can be reduced and material separation can be suppressed by the pressure loss and the like caused by the small cross-sectional area formed in the hollow 34 of the hose body 31 and the multiple protrusions 35. Furthermore, since the protrusions 35 provided on the inner surface 33 of the hose body 31 are not directly attached to the inner surface 33, even if concrete collides with the protrusions 35, there is no risk of the protrusions 35 being damaged by the collision.

[0057] Next, an example of a restraint device according to another embodiment will be described with reference to Figures 5 to 8. Here, in the description of Figures 5 to 7, a half restraint device of the restraint device of each embodiment will be shown and described.

[0058] 5 has a half restraint 41A having a half body 42 and a plurality of mutually separated spiral protrusions 45 provided on a fastening surface 43 of the half body 42, and is formed by connecting two half restraints 41A. Here, a continuous spiral protrusion may be provided instead of the mutually separated spiral protrusions.

[0059] In this way, since the protrusions 45 have multiple spiral shapes, the flow rate of the concrete can be reduced while flowing along the spiral protrusions formed on the inner surface 33 of the hollow 34 of the hose body 31.

[0060] 6, a restraining device 40B according to a third embodiment includes a half body 42 and a half restraining device 41B having a plurality of dot-shaped protrusions 44 provided on a fastening surface 43 of the half body 42, and is formed by connecting two half restraining devices 41B. The restraining device 40B is, for example, a long restraining device in the direction in which the concrete flows, and on the fastening surface 43 of the half restraining device 41B, the density of the protrusions 44 is relatively higher on the upstream side in the direction in which the concrete flows than on the downstream side.

[0061] In this way, the relatively high density of the protrusions 44 on the upstream side makes it possible to suppress the flow rate of the concrete before it increases, thereby suppressing the flow rate of the concrete on the downstream side and preventing separation of the concrete materials.

[0062] 7, a restraining device 40C according to a fourth embodiment includes a half body 42 and a half restraining device 41C having a plurality of dot-shaped protrusions 44 provided on a fastening surface 43 of the half body 42, and is formed by connecting two half restraining devices 41C. Like restraining device 40B, restraining device 40C is a long restraining device, for example, in the direction in which the concrete flows. However, unlike restraining device 40B, the density of the protrusions 44 on the fastening surface 43 of half restraining device 41C is relatively higher on the downstream side in the direction in which the concrete flows than on the upstream side.

[0063] In this way, because the density of the protrusions 44 on the downstream side is relatively high, the increased flow rate of the concrete can be reduced by the protrusions 35 formed by the relatively high density protrusions 44 on the downstream side, making it possible to prevent separation of the concrete materials.

[0064] 8 shows a restraint device 40D according to a fifth embodiment, in which a pair of half restraint devices 41D, each having half bodies 42A and 42B of different widths, are fitted together and have a tightening band 46 disposed around their outer peripheries. A plurality of dot-shaped protrusions 44 are provided on the tightening surface 43 of each of the half bodies 42A and 42B.

[0065] The hose body 31 is disposed inside the pair of half restraints 41D, and by changing the fit of the pair of half restraints 41D, it is possible to adjust the clamping force applied to the hose body 31. Once the clamping force has been adjusted as desired and protrusions 35 of the desired shape and dimensions have been formed on the inner surface 33 of the hose body 31, the hook-and-loop fasteners 47 of the clamping band 46 can be fixed, thereby maintaining the clamped state provided by the clamping band 46.

[0066] Next, an example of a flexible hose according to another embodiment will be described with reference to FIGS.

[0067] The flexible hose 50A shown in FIG. 9 has a configuration in which a restraining device 40B (40C) is provided over substantially the entire length of the hose main body 31.

[0068] In such long restraining devices 40B and 40C, by changing the density of the protrusions 44 on the upstream and downstream sides, it is possible to effectively suppress the flow rate of the concrete and prevent the resulting separation of the concrete materials.

[0069] On the other hand, a flexible hose 50B shown in FIG. 10 has restraining devices 40 intermittently provided on a hose main body 31. As shown in FIG.

[0070] In this way, by providing a plurality of restraining devices 40 intermittently, the concrete flow rate can be reduced before it increases, and by repeating this process, it is possible to effectively suppress the concrete flow rate and prevent the resulting segregation of concrete materials. Also, as is clear from a comparison with the flexible hose 50A shown in Fig. 9, the amount (volume) of restraining devices used can be about half to two-thirds of that used with the flexible hose 50A, which reduces the material cost of the restraining devices, making this an economically excellent form in addition to being effective in suppressing the segregation of concrete materials.

[0071] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0072] 10: Concrete pump truck 11: Body 12: First arm 13: Second arm 14: Third arm 15, 16, 17: Pressure pipe 20: Flexible hose 21:Tip tip 31: Hose body 32: Exterior 33: Inner self 34:Hollow 35: Protrusion 40,40A,40B,40C,40D:Restraint 41,41A,41B,41C,41D: Half restraint 42, 42A, 42B: Half body 43: Clamping surface 44: Protrusion (dot-shaped protrusion) 45: Protrusion (spiral protrusion) 46: Tightening band 47: Velcro 50: Flexible hose

Claims

1. A flexible hose connected to a pressure pipe of a concrete pump vehicle, the hose having a hollow hose body, a protrusion is interposed between the outer surface of the hose body and a restraining device disposed around the outer surface, A flexible hose characterized in that, when tightened by the restraining device, the protrusion presses against a portion of the hose body, causing the portion to protrude into the hollow, thereby forming a protrusion that reduces the flow rate of concrete flowing through the hollow.

2. 2. The flexible hose according to claim 1, wherein the protrusions are provided on a clamping surface of the restraining device that clamps the hose body.

3. 3. The flexible hose according to claim 1, wherein the clamping force of the restraining device is adjustable.

4. A flexible hose connected to a pressure pipe of a concrete pump vehicle, the hose having a hollow hose body, A protrusion is provided on the outer surface of the hose body, and a restraining device is disposed around the outer surface, A flexible hose, characterized in that, when tightened by the restraining device, the protrusion presses a part of the hose body, causing the part to protrude into the hollow, thereby forming a protrusion.

5. A flexible hose connected to a pressure pipe of a concrete pump vehicle, the hose having a hollow hose body, a protrusion is interposed between the outer surface of the hose body and a restraining device disposed around the outer surface, When the restraining device is tightened, the protrusion presses a part of the hose body, causing the part to protrude into the hollow and form a protrusion, A flexible hose, wherein the protrusions are in the form of a continuous spiral or a plurality of spirals separated from one another.

6. A flexible hose connected to a pressure pipe of a concrete pump vehicle, the hose having a hollow hose body, a protrusion is interposed between the outer surface of the hose body and a restraining device disposed around the outer surface, When the restraining device is tightened, the protrusion presses a part of the hose body, causing the part to protrude into the hollow and form a protrusion, A flexible hose characterized in that, in the region where the hose body is tightened by the restraining device, the density of the protrusions is relatively higher on the downstream side in the direction of concrete flow than on the upstream side.

7. A flexible hose connected to a pressure pipe of a concrete pump vehicle, the hose having a hollow hose body, a protrusion is interposed between the outer surface of the hose body and a restraining device disposed around the outer surface, When the restraining device is tightened, the protrusion presses a part of the hose body, causing the part to protrude into the hollow and form a protrusion, A flexible hose characterized in that, in the region where the hose body is tightened by the restraining device, the density of the protrusions is relatively higher on the upstream side in the direction of concrete flow than on the downstream side.

8. A restraining device that is connected to a pressure pipe of a concrete pump vehicle and is attached to an outer surface of a hose body having a hollow to tighten the outer surface, a protrusion is provided on a clamping surface of the restraint device that clamps the hose body, A restraining device for a flexible hose, characterized in that, when tightened by the restraining device, the protrusion presses against a part of the hose body, causing the part to protrude into the hollow, thereby forming a protrusion that reduces the flow rate of concrete flowing through the hollow.

9. A restraining device that is connected to a pressure pipe of a concrete pump vehicle and is attached to an outer surface of a hose body having a hollow to tighten the outer surface, a protrusion is provided on a clamping surface of the restraint device that clamps the hose body, When the restraining device is tightened, the protrusion presses a portion of the hose body, causing the portion to protrude into the hollow. A restraining device for a flexible hose, characterized in that the protrusion has a continuous spiral shape or a plurality of spiral shapes separated from each other.

10. A restraining device that is connected to a pressure pipe of a concrete pump vehicle and is attached to an outer surface of a hose body having a hollow to tighten the outer surface, a protrusion is provided on a clamping surface of the restraint device that clamps the hose body, When the restraining device is tightened, the protrusion presses a portion of the hose body, causing the portion to protrude into the hollow. A flexible hose restraint device characterized in that, when the hose body is tightened by the restraint device, the protrusions are provided on the tightening surface so that the density of the protrusions is relatively higher on the downstream side of the concrete flow direction than on the upstream side.

11. A restraining device that is connected to a pressure pipe of a concrete pump vehicle and is attached to an outer surface of a hose body having a hollow to tighten the outer surface, a protrusion is provided on a clamping surface of the restraint device that clamps the hose body, When the restraining device is tightened, the protrusion presses a portion of the hose body, causing the portion to protrude into the hollow. A flexible hose restraint device characterized in that, when the restraint device is tightening the hose body, the protrusions are provided on the tightening surface so that the density of the protrusions is relatively higher on the upstream side of the concrete flow direction than on the downstream side.

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