Pressure feeding device

Abstract

To solve the problem in which it has been difficult to pressure-feed fresh mortar or fresh concrete containing fiber reinforcement by a pump using a pressure pipe.SOLUTION: This invention relates to a pressure feeding method using a pressure feeding system which is arranged downstream of a tapered pipe of a pump for feeding fresh mortar or fresh concrete and which comprises a pipe body and a stirring portion. The pipe body comprises a first connection portion arranged on its upstream side and a second connection portion arranged on its downstream side. The stirring portion is built in the pipe body and comprises a rotational shaft and a pin-shaped stirring branch erected on the rotational shaft, the stirring portion not being present within a pressure feeding pipe. When the fresh mortar or fresh concrete contains reinforcing fibers, an inner diameter of the pipe body is 50 to 250 mm, an outer circumferential diameter of the stirring branch is 3 to 20% of the inner diameter of the pipe body, a distance between the first connection portion and the second connection portion is 30 to 100 mm, and a rotational speed of the rotational shaft is 5 to 30 rpm.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an improvement in a pumping device for ready-mixed mortar and ready-mixed concrete. Here, ready-mixed mortar refers to a fluid mortar material (a composition based on cement, sand, and water) before hardening, and ready-mixed concrete refers to a fluid concrete material (a composition based on cement, sand, water, and aggregate) before hardening. Ready-mixed mortar and ready-mixed concrete may contain reinforcing fibers. [Background technology]

[0002] To prevent cracks from occurring on the surface of concrete structures (such as the underside of a pier), the surface is covered with so-called fiber-reinforced mortar, which is made by mixing reinforcing fibers such as polyamide wire and steel wire into the mortar. Generally, the fluidity of so-called green fiber-reinforced mortar before hardening is low, so it has been applied and layered manually onto the surface of the concrete structure to be repaired. Recently, pumpable fiber-reinforced mortar has been proposed, which can be used to mechanically coat the surface of a concrete structure to be repaired by placing a frame opposite the surface and pouring the raw fiber-reinforced mortar between the surface and the frame. Please refer to Patent Documents 1 and 2 as prior art documents that disclose techniques related to the present invention. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-9378 [Patent Document 2] Japanese Utility Model Application Publication No. 59-124260 Summary of the Invention [Problem to be solved by the invention]

[0004] Such raw fiber reinforced mortar is said to be pumpable using a general-purpose pressure pipe. However, in reality, it is difficult to pump this material using a pressure pipe, and pumping it places a heavy load on the pump. According to the inventors' investigation, this is due to the high viscosity of the green fiber-reinforced mortar.

[0005] The raw fiber-reinforced mortar discharged from the pump is sent to the pressure pipe through a tapered pipe connected to the pump's discharge port. The tapered pipe is a cylindrical member with a large diameter section that can be connected to the pump's discharge port and a small diameter section that can be connected to the pressure pipe, etc., and the diameter gradually decreases from the large diameter section to the small diameter section. The highly viscous raw fiber-reinforced mortar discharged from the pump is compressed as it passes through such a tapered pipe, and the resistance to pumping can become unexpectedly large. This is because the raw fiber-reinforced mortar is gradually compressed in the tapered pipe, forming lumps (areas with abnormally high viscosity). The reason for this is thought to be that when the green fiber-reinforced mortar is gradually compressed in the tapered pipe, the water contained in the green fiber-reinforced mortar separates. Expanding on this, even in the case of ready-mixed mortar (not containing reinforcing fibers) or ready-mixed concrete, there is a risk of water separation occurring in the tapered pipe.

[0006] Furthermore, according to the inventors' investigations, it was extremely difficult to pump raw fiber-reinforced mortar over long distances because, when the pumping distance reached about 50 to 100 m, a lump of fiber-reinforced mortar (a rod-shaped lump) formed in the center of the pumping pipe, and this lump created a large resistance. [Means for solving the problem]

[0007] The present invention has been made to solve the above problems, and its first aspect is defined as follows: A mixing pressure pipe is arranged downstream of the tapered pipe of a pump that sends ready-mixed mortar or ready-mixed concrete, The apparatus comprises a pipe body and a stirring section, The pipe body includes a first connecting portion disposed on the upstream side thereof and a second connecting portion disposed on the downstream side thereof, The agitation pressure pipe has the agitation section built into the pipe body.

[0008] According to the mixing pressure pipe of the first aspect defined in this manner, the ready-mixed mortar or ready-mixed concrete discharged from the pump and passing through the tapered pipe is introduced into the pipe body from the first connection part, where it is mixed in the mixing part. This allows the water that separated from the fresh mortar or fresh concrete when it passed through the tapered pipe to disperse again, and in the case of fiber-reinforced mortar, clumps are broken down and disappear. In other words, the original properties of the fresh mortar or fresh concrete before passing through the tapered pipe are restored.

[0009] The second aspect of the present invention is defined as follows: The agitation pressure-transfer pipe of a first aspect, wherein the agitation section includes a rotating shaft and pin-shaped agitation branches erected on the rotating shaft. According to the mixing pressure-transfer pipe of the second aspect defined as above, the mixing tines erected on the rotating shaft of the mixing section are pin-shaped, so that resistance to the pumped fresh mortar or fresh concrete can be minimized. Furthermore, even if lumps of fiber-reinforced mortar are generated, the use of pin-shaped mixing tines reduces the power required to rotate the mixing section, allowing the motor for the rotating shaft to be made smaller.

[0010] The rotating shaft is rotated by a motor attached to the outside of the pipe body. The rotation speed can be set arbitrarily by the control unit (aspect 8). This ensures the optimal rotation speed, i.e., the optimal mixing state, depending on the characteristics of the object to be pumped. A steel pipe can be used for the rotating shaft. The cross-sectional shape of the rotating shaft is arbitrary, but it is preferable to make it circular, as this reduces resistance in the rotational direction (circumferential direction). The central axis of the rotating shaft is preferably aligned with the central axis of the pipe body (third aspect), in order to achieve uniform stirring within the pipe body.

[0011] The stirring blades are made of steel and may have any cross-sectional shape. The method of fixing the stirring blades to the rotating shaft is also arbitrary, but for example, the ends of the stirring blades may be abutted against the rotating shaft, or the stirring blades may be passed through the rotating shaft and the two may be welded to the circumferential surface of the rotating shaft. The arrangement of the stirring blades in the circumferential direction relative to the rotating shaft is arbitrary. For example, the stirring blades can be arranged on the same cross section of the stirring shaft, or they can be arranged in a spiral on the circumferential surface of the stirring shaft. The circumferential pitch of the stirring blades relative to the rotating shaft (the spacing between the stirring blades when viewed from the axial direction of the rotating shaft) is also arbitrary. For example, they can be arranged at the same pitch, or at different pitches. When arranged at the same pitch, it is preferable that the intervals be between 90 degrees and 180 degrees.

[0012] The pitch of the stirring blades in the axial direction relative to the rotation axis is selected arbitrarily depending on the arrangement density in the circumferential direction, and can be, for example, 3 to 20% of the length of the pipe body. The length of the stirring blade is preferably such that the orbital radius of its tip is 50 to 95% of the inner diameter of the pipe body. By setting the relationship between the two to 95% or less, it is possible to prevent interference with the pipe body while reliably eliminating separation of water contained in the ready-mixed mortar or ready-mixed concrete and eliminating lumps. Furthermore, by setting the relationship between the two to 50% or more, it is possible to reliably prevent the formation of lumps in the ready-mixed mortar or ready-mixed concrete. The stirring tines may all be of the same length, or stirring tines of different lengths may be used.

[0013] The stirring section is preferably detachable from the pipe body, so that the inside of the stirring section can be efficiently washed with water after the pumping operation is completed. The shaft of the stirring unit is rotatably supported (axially supported) by the lids closing both ends of the tube body (fifth aspect). In order to make the stirring unit detachable from the tube body, at least one of the lids at the ends of the tube body is detachable from the tube body.

[0014] If a connection to a tapered tube or pressure pipe is provided on the lid that closes the end of the tube body, the structure that supports the shaft of the stirring section is restricted, which in turn requires a larger diameter for the lid, which in turn increases the diameter of the tube body. Therefore, in this invention, in order to avoid interference with the stirring section, either one, or preferably both, of the connection sections (first connection section and second connection section) with other pipes (tapered pipes or pressure pipes) are provided on the side of the pipe body (fourth aspect). The first and second connection parts are preferably provided at an incline with respect to the side surface of the pipe body. The angle of inclination is not particularly limited, but it is preferable to arrange them so that an included angle of 30 to 80 degrees is formed with respect to the central axis of the pipe body (the pumping direction of mortar). The direction of inclination is along the flow direction of the object to be pumped. In other words, the flow direction of the object to be pumped at the first connection part on the upstream side with respect to the flow direction of the object to be pumped at the pipe body is the same direction via the aforementioned inclination angle, and the flow direction of the object to be pumped at the second connection part on the downstream side is also the same direction as the flow direction of the object to be pumped at the pipe body via the aforementioned inclination angle. The first and second connecting portions are preferably provided at positions as far apart as possible on the pipe body.

[0015] Ready-mixed mortar refers to mortar material before hardening (a composition based on cement, sand, and water). Reinforcing fibers can also be mixed into this mortar material. In this specification, ready-mixed mortar with reinforcing fibers mixed in is referred to as ready-mixed fiber-reinforced mortar. Ready-mixed concrete refers to fluid concrete material before hardening (a composition based on cement, sand, water, and aggregate). Reinforcing fibers can also be mixed into this concrete material. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram showing a pumping system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the agitation pressure pipe according to the embodiment of the present invention. [Figure 3] FIG. 3 is a side view of the same. [Figure 4]FIG. 4 is a partially cutaway plan view of the same. [Figure 5] FIG. 5 is a cross-sectional view of the diffusion pumping pipe. [Figure 6] Figure 6 is a photograph showing the assembled mixing pressure pipe. [Figure 7] Figure 7 is a photograph showing the agitation pressure pipe in a disassembled state. DETAILED DESCRIPTION OF THE INVENTION

[0017] 1 shows a pumping system 1 according to an embodiment. This pumping system 1 is composed of a pump 2, a tapered pipe 3, a first mixing and pumping pipe 4, a first pumping pipe 5, a second mixing and pumping pipe 4a, and a second pumping pipe 6, which are connected in sequence. This pumping system 1 pumps and pumps raw fiber-reinforced mortar to the pouring destination. If the pouring destination is close (for example, the distance from the pump 2 is 50 m or less), the second pumping pipe 6 becomes unnecessary, and the second mixing and pumping pipe 4a between the second pumping pipe 6 and the first pumping pipe 5 also becomes unnecessary. In the pressure-feeding system 1, general-purpose products can be used for the pump 2, tapered pipe 3, first pressure-feeding pipe 5, and second pressure-feeding pipe 6. The first agitation pressure-feeding pipe 4 and the second agitation pressure-feeding pipe 4a may be of the same specifications or may be of different specifications. The agitation speeds in the first agitation pressure-feeding pipe 4 and the second agitation pressure-feeding pipe 4a are controlled independently.

[0018] The first agitation pressure-transfer pipe 4 comprises a pipe body 10 , an agitation unit 30 and an agitation drive unit 60 . The pipe body 10 is made of a cylindrical steel pipe with a circular cross section (see FIG. 5). A first connecting portion 11 is provided on one end of the side surface (circumferential surface) of the pipe main body 10, and a second connecting portion 12 is provided on the other end. The first connection part 11 is arranged on the upstream side in the pumping direction, and the second connection part 12 is arranged on the downstream side.

[0019] The opening diameters of the first connecting part 11 and the second connecting part 12 are standardized, and they are liquid-tightly connected to the small diameter part of the tapered tube 3 and the end of the pressure pipe, respectively, via sealing members such as O-rings and mechanical fasteners such as clamps. The first connecting part 11 and the second connecting part 12 are arranged at an angle with respect to the central axis of the pipe body 10. In this example, the first connecting part 11 is arranged at an angle of 60 degrees with respect to the central axis of the pipe body 10, facing one end side of the pipe body 10 (the left side in the figure, the downstream side in the flow direction of the raw fiber-reinforced mortar), and the second connecting part 12 is also arranged at an angle of 60 degrees with respect to the central axis of the pipe body 10, facing the other end side of the pipe body 10 (the driving part 60 side, the upstream side in the flow direction of the raw fiber-reinforced mortar). The included angles of the first connecting portion 11 and the second connecting portion 12 do not have to be the same. In this example, the first connecting portion 11 and the second connecting portion 12 are arranged at 180-degree intervals in the circumferential direction on the side of the pipe main body 10, but the circumferential intervals on the side of the pipe main body 10 can be designed arbitrarily.

[0020] 2 is a pressure gauge that displays the pressure inside the pipe body 10. Pressure gauges can also be arranged at the first connecting part 11 and the second connecting part 12 to measure the internal pressure. The base end of the tube body 10 is covered with a first lid portion 15 , and the tip side thereof is covered with a second lid portion 16 . O-rings are interposed between each end of the tube body 10 and the first and second lid portions 15 and 16, and they are fastened together by clamps 17 and 18.

[0021] The stirring unit 30 comprises a rotating shaft 31 and stirring blades 33 . The rotating shaft 31 is made of a round steel pipe and is supported by the first lid portion 15 and the second lid portion 16. The central axis of the rotating shaft 31 coincides with the central axis of the pipe body 10. This is to ensure uniform stirring. One end of the rotating shaft 31 penetrates the first lid part 15, and a gear 20 is provided at the penetrated part. A drive gear of a motor 25 (described later) meshes with this gear 20, and the rotational driving force of the motor 25 is transmitted to the rotating shaft 31. The gear 20 and the motor 25 constitute an agitation drive part 60. The rotation speed and other parameters of the motor 25 are controlled by a control unit 70 (see FIG. 6). The control unit 70 includes a power supply unit for the motor 25 and a rotation control unit.

[0022] The stirring blade 33 is a round steel bar that penetrates the rotating shaft 31. The stirring blade 33 is welded to the side of the rotating shaft 31. Because the stirring blades 33 penetrate the rotating shaft 31, when the rotating shaft 31 is viewed from the axial direction, the structure is such that two stirring blades 33 protrude at an interval of 180 degrees (see Figure 5). By having the stirring blades 33 penetrate the rotating shaft 31, high mechanical rigidity is given to the stirring blades 33.

[0023] In this example, the stirring blades 33 are arranged at equal intervals in the axial direction of the rotating shaft 31. The pitch of the stirring blades 33 in the axial direction can be set arbitrarily, but in this example, the axial pitch of the stirring blades 33 is set to 50 mm for a 1000 mm long pipe body 10. The length of the stirring blades 33 is set so that the diameter of the circle drawn by their tips is 120 mm, and the clearance between the tip and the inner diameter of the pipe body 10 is about 10 mm. The stirring blades 33 are made of rod-shaped steel material with a diameter of 9 mm. On the peripheral wall of the pipe body 10, the distance between the center of the first connecting portion 11 and the center of the second connecting portion 12 is 800 mm.

[0024] The tip of the rotating shaft 31 (the right end in the figure) is detachably connected to a bearing 36 provided in the center of the second cover part 16. For example, a key is provided at the tip of the bearing 36 and a key groove is provided on the tip side of the rotating shaft 31, so that the circumferential movement of both is restricted while the axial movement of both is free. The other end of the rotary shaft 31 is also detachably connected to a bearing 35 provided in the center of the first cover part 15. This bearing 35 is connected to the gear 20 and rotates as the gear 20 rotates.

[0025] An example will be described in which the above-mentioned first mixing pressure-transfer pipe 4 is applied to the pressure-transfer system 1 to pump raw fiber-reinforced mortar (Slimcrete (registered trademark)). The components constituting the pressure-transfer system 1 are as follows. The first mixing pressure-transfer pipe 4 and the second mixing pressure-transfer pipe 4a have the same structure. Pump 2 discharge pressure: 10.7Mpa Length of tapered tube 3: 1.5m~2.0m Diameter of the large diameter part of the tapered tube 3: 2.5B (65A) Diameter of the small diameter part: 2B (50A) Rotation speed of the first agitation pressure pipe 4: 5 to 30 rpm Length of first pressure pipe 5: 20 to 100 m Rotation speed of the second agitation pressure pipe 4a: 5 to 30 rpm Length of second pressure pipe 6: 20~60m In this way, the pumping system 1 can mechanically pump and pump the raw fiber reinforced mortar up to 160 m away. In the pressure-feeding system of Fig. 1, either the first agitation pressure-feeding pipe 4 or the second agitation pressure-feeding pipe 4a can be omitted. This can be selected arbitrarily depending on the object to be pumped, the pumping distance, the temperature conditions, etc.

[0026] Expanding on the above example, the pumping method for ready-mixed mortar and ready-mixed concrete can be defined as follows: Tube body A pump, a tapered pipe, an agitation pressure pipe, and a first pressure pipe are sequentially connected in a pressure system, The agitation pressure pipe includes a pipe body and an agitation section, the pipe main body includes a first connection portion connected to an upstream side of a flow to be pumped and a second connection portion connected to a downstream side of the flow, the first connection portion and the second connection portion being attached to a side surface of the pipe main body; The stirring unit includes a rotating shaft that is detachably attached to the pipe main body and a pin-shaped stirring branch that is erected on the rotating shaft. When the pumped object is fresh mortar containing reinforcing fibers, The inner diameter of the pipe body is 50 to 250 mm, The outer diameter of the stirring blade is set to 3 to 20% of the inner diameter of the pipe body, The distance between the first connection portion and the second connection portion is 30 to 100 mm, The rotation speed of the rotating shaft is set to 5 to 30 rpm. A method for pumping ready-mixed mortar and ready-mixed concrete. The following information is disclosed: (1) A mixing pressure pipe is arranged downstream of the tapered pipe of a pump that sends ready-mixed mortar or ready-mixed concrete, The apparatus comprises a pipe body and a stirring section, The pipe body includes a first connecting portion disposed on the upstream side thereof and a second connecting portion disposed on the downstream side thereof, The agitation pressure pipe has the agitation section built into the pipe body. (2) The agitation pressure-transfer pipe according to (1), wherein the agitation section comprises a rotating shaft and pin-shaped agitation branches erected on the rotating shaft. (3) The agitation pressure-transport pipe according to (2), wherein the axis of the rotation shaft coincides with the central axis of the pipe body. (4) The agitation pressure-transfer pipe according to (2), wherein the first connecting portion and / or the second connecting portion are formed on a side surface of the pipe body. (5) The agitation pressure transfer pipe according to (4), wherein a lid at at least one end of the pipe body is detachable from the pipe body, and the shaft of the agitator is rotatably supported by the lid. (6) the first connecting portion and the second connecting portion are attached to a side surface of the pipe body, The agitation pressure transfer pipe according to (2), wherein the agitation section can be detachably inserted from the end side of the pipe body. (7) The agitation pressure transfer pipe according to (6), wherein the first connecting portion and the second connecting portion are arranged at an angle with respect to the central axis of the pipe body. (8) The agitation pressure-transfer pipe according to (1), further comprising a control unit that controls the agitation speed of the agitation unit. (9) An agitation unit used in an agitation pressure pipe, The agitation unit comprises a rotating shaft that is detachably attached to the pipe body of the agitation pressure-transport pipe, and a pin-shaped agitation branch that is erected on the rotating shaft. (10) A pipe body used in an agitation pressure pipe, A pipe body comprising a first connection portion connected to the upstream side and a second connection portion connected to the downstream side, the first connection portion and the second connection portion being attached to the side of the pipe body. (11) A pumping system for ready-mixed mortar or ready-mixed concrete, A pressure-feeding system in which a pump, a tapered pipe, and the first agitation pressure-feeding pipe described in any one of (1) to (8) are connected in this order. (12) A pumping system for ready-mixed mortar or ready-mixed concrete, A pump, a tapered pipe, and the first agitation pressure-transport pipe described in any one of (1) to (8) are connected in this order, A pressure-feeding system in which the upstream end of a first pressure-feeding pipe is connected to the second connection portion of the first agitation pressure-feeding pipe, and the downstream end of the first pressure-feeding pipe is connected to the first connection portion of the second agitation pressure-feeding pipe described in any one of claims 1 to 8. (13) The pumping system according to (12), wherein an upstream end of a second pumping pipe is connected to the second connecting portion of the second agitation pumping pipe. "1" Pumps that send ready-mixed mortar and ready-mixed concrete, a tapered tube connected to the pump; an agitation pressure pipe disposed downstream of the tapered pipe; a pressure pipe disposed downstream of the agitation pressure pipe, The agitation pressure pipe includes a pipe body and an agitation section, The pipe body is provided with a first connection portion disposed on the upstream side thereof for receiving the mortar or the ready-mixed concrete from the tapered pipe, and a second connection portion disposed on the downstream side thereof for sending the ready-mixed mortar or the ready-mixed concrete to the pressure pipe, The stirring unit is built into the pipe body, The stirring unit includes a rotating shaft and a pin-shaped stirring branch provided upright on the rotating shaft, In a pumping system, there is no stirring section in the pumping pipe, A pumping system, wherein the first connection portion and / or the second connection portion are formed on a side surface of the pipe body. "2" Pumps that send ready-mixed mortar and ready-mixed concrete, a tapered tube connected to the pump; an agitation pressure pipe disposed downstream of the tapered pipe; a pressure pipe disposed downstream of the agitation pressure pipe, The agitation pressure pipe includes a pipe body and an agitation section, The pipe body is provided with a first connection portion disposed on the upstream side thereof for receiving the mortar or the ready-mixed concrete from the tapered pipe, and a second connection portion disposed on the downstream side thereof for sending the ready-mixed mortar or the ready-mixed concrete to the pressure pipe, The stirring unit is built into the pipe body, The stirring unit includes a rotating shaft and a pin-shaped stirring branch provided upright on the rotating shaft, In a pumping system, there is no stirring section in the pumping pipe, The pin-shaped stirring blade penetrates the rotating shaft, and the length of the stirring blade is such that the orbital radius of the tip of the stirring blade is 50 to 95% of the inner diameter of the pipe body. "3" Pumps that send ready-mixed mortar and ready-mixed concrete, an agitation pressure pipe disposed downstream of the pump; a pressure pipe disposed downstream of the agitation pressure pipe, The agitation pressure pipe includes a pipe body and an agitation section, The pipe body is provided with a first connection part disposed on the upstream side thereof for receiving the mortar or the ready-mixed concrete from the pump, and a second connection part disposed on the downstream side thereof for delivering the ready-mixed mortar or the ready-mixed concrete to the pressure pipe, The stirring unit is built into the pipe body, In a pumping system, there is no stirring section in the pumping pipe, A pumping system, wherein the first connection portion and / or the second connection portion are formed on a side surface of the pipe body. "4" The pumping system according to [3], wherein the pipe body is further provided with a pressure gauge. "5" The pumping system according to [3], wherein the length of the first pumping pipe is 20 to 100 m. "6" The pumping system described in "3" above, wherein the pin-shaped stirring blade penetrates the rotating shaft, and the length of the stirring blade is such that the orbital radius of its tip is 50 to 95% of the inner diameter of the pipe body. "7" The pumping system according to item 3, wherein a lid at at least one end of the pipe body is detachable from the pipe body, and the shaft of the stirring unit is rotatably supported by the lid. "8" 4. The pumping system according to claim 3, wherein the stirring unit is detachably inserted from an end side of the pipe body. "9" The pumping system according to [3], wherein the first connecting portion and the second connecting portion are arranged at an angle with respect to the central axis of the pipe body. "10" The pumping system according to "3", further comprising a control unit that controls the stirring speed of the stirring unit. "11" Pumps that send ready-mixed mortar and ready-mixed concrete, a mixing pressure pipe; a first pressure pipe disposed between the agitation pressure pipe and the pump; The agitation pressure pipe includes a pipe body and an agitation section, The pipe body includes a first connection portion disposed on the upstream side thereof and connected to the first pressure pipe, and a second connection portion disposed on the downstream side thereof and delivering the ready-mixed mortar or the ready-mixed concrete to a second pressure pipe, The stirring unit is built into the pipe body, In a pumping system, there is no stirring unit in the first pumping pipe and the second pumping pipe, A pumping system, wherein the first connection portion and / or the second connection portion are formed on a side surface of the pipe body. "12" An agitation pressure pipe that is arranged downstream of a pump that sends ready-mixed mortar or ready-mixed concrete, and is connected to a pressure pipe that does not have an agitation section, The apparatus comprises a pipe body and a stirring section, The pipe body is provided with a first connection part disposed on the upstream side thereof for receiving the mortar or the ready-mixed concrete from the pump, and a second connection part disposed on the downstream side thereof for delivering the ready-mixed mortar or the ready-mixed concrete to the pressure pipe, The stirring unit is built into the pipe body, The agitation pressure-transport pipe, wherein the first connecting portion and / or the second connecting portion are formed on a side surface of the pipe body. "13" A mixing pressure pipe arranged downstream of a pump that sends ready-mixed mortar or ready-mixed concrete, The apparatus comprises a pipe body and a stirring section, The pipe body is provided with a first connection part disposed on the upstream side thereof for receiving the mortar or the ready-mixed concrete from the pump, and a second connection part disposed on the downstream side thereof for delivering the ready-mixed mortar or the ready-mixed concrete to the pressure pipe, The stirring unit is built into the pipe body, The stirring unit includes a rotating shaft and a pin-shaped stirring branch provided upright on the rotating shaft, The pin-shaped stirring blades penetrate the rotating shaft, and the length of the stirring blades is such that the orbital radius of the tips of the stirring blades is 50 to 95% of the inner diameter of the pipe body. [Explanation of symbols]

[0027] 1. Pressure system 2 pumps 3 Tapered pipe 4, 4a Mixing pressure pipe 5, 6 Pressure pipe 10 Tube body 11 First connection part 12 Second connection part 15, 16 Lid 20 gears 25 motor 30 Stirring section 31 Rotation axis 33 Mixing branch

Claims

[Claim 1] Pumps that send ready-mixed mortar and ready-mixed concrete, a tapered tube connected to the pump; an agitation pressure pipe disposed downstream of the tapered pipe; a pressure pipe disposed downstream of the agitation pressure pipe, The agitation pressure pipe includes a pipe body and an agitation section, The pipe body is provided with a first connection portion disposed on the upstream side thereof for receiving the mortar or the ready-mixed concrete from the tapered pipe, and a second connection portion disposed on the downstream side thereof for delivering the ready-mixed mortar or the ready-mixed concrete to the pressure pipe, The stirring unit is built into the pipe body, The stirring unit includes a rotating shaft and a pin-shaped stirring branch provided upright on the rotating shaft, A pumping method using a pumping system in which no stirring unit is present in the pumping pipe, When the mortar or the ready-mixed concrete contains reinforcing fibers, The inner diameter of the pipe body is 50 to 250 mm, The outer diameter of the stirring blade is set to 3 to 20% of the inner diameter of the pipe body, The distance between the first connection portion and the second connection portion is set to 30 to 100 mm, The rotation speed of the rotating shaft is set to 5 to 30 rpm. Pressure delivery method.

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