Concrete placing device and concrete pump method

Abstract

To provide a concrete placing device capable of suppressing concrete remaining at a boom tip from falling and flowing out from a discharge port of a tip hose when a boom device is moved, and a concrete pump construction method using the concrete placing device.SOLUTION: Since a flat part 17 of a hose part 15 of a tip hose 11 is pinched by a pair of arms 31, 31 formed by overlapping leaf springs, concrete remaining at the tip of a boom when a boom device 1 moves can be blocked by pinching parts (pressurizing parts 32, 32) of the pair of arms 31, 31, and the concrete falling from the tip of the boom can be prevented from flowing out from a discharge port 18 of the tip hose 11.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a concrete pouring device and a concrete pumping method using the concrete pouring device. [Background technology]

[0002] Patent Document 1 discloses an abrasion-resistant hose 10 that is connected to the tip of a boom 21 of a concrete pump vehicle 20 via a docking hose 30. This abrasion-resistant hose 10 (hereinafter referred to as the "tip hose") is formed in a flattened cylindrical shape except for one side portion that is fixed to a connecting fitting 12, and the braking effect that applies the brakes to the concrete falling inside the tip hose can suppress separation of aggregate when the concrete falls. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6315327 [Patent Document 2] Registered Utility Model No. 3220209 Summary of the Invention [Problem to be solved by the invention]

[0004] In the concrete pump method, concrete remaining at the boom tip (docking hose, tapered pipe, etc.) may fall when the boom device moves, and the fallen concrete may flow out from the outlet of the tip hose. For example, when applied to underwater casting, there is a risk that the concrete flowing out from the tip hose may contaminate the water, or that the concrete flowing out from the tip hose may fall onto already cast concrete, degrading the quality of the concrete.

[0005] Therefore, Patent Document 2 discloses a concrete pouring device equipped with a discharge valve that opens and closes a concrete discharge port provided at the end of a pressure pipe. However, the concrete pouring device described in Patent Document 2 has a discharge valve at the end of the discharge port, which may make it difficult to insert into a narrow formwork.

[0006] The present invention aims to provide a concrete pouring device that can prevent concrete remaining at the tip of the boom from falling and flowing out of the discharge outlet of the tip hose when the boom device moves, and a concrete pump construction method using the concrete pouring device. [Means for solving the problem]

[0007] The concrete pouring device of the present invention is a concrete pouring device used in a concrete pump construction method, and comprises a tip hose connected to the tip of a boom, and a restraining means for preventing concrete remaining at the tip of the boom from falling and flowing out of the outlet of the tip hose, wherein the tip hose has a hose portion having a layer made of an elastic material, and a cylindrical connecting fitting for connecting to the boom tip, and the restraining means has a pair of arms that are arranged symmetrically with respect to a uniaxial plane of the connecting fitting, one end of which is fixed to the connecting fitting and the other end of which cooperates to clamp the hose portion. The concrete pumping method of the present invention is characterized in that concrete is poured into water using the concrete pouring device. Effect of the Invention

[0008] According to the present invention, it is possible to provide a concrete pouring device that can prevent concrete remaining at the tip of the boom from falling and flowing out of the outlet of the tip hose when the boom device moves, and a concrete pump construction method using the concrete pouring device. [Brief description of the drawings]

[0009] [Figure 1]FIG. 2 is an explanatory diagram of the present embodiment, showing the tip of a boom. [Diagram 2] FIG. 2 is an explanatory diagram of the present embodiment, showing a front view of a tip hose. [Diagram 3] FIG. 2 is an explanatory diagram of the present embodiment, showing a cross-sectional view of a hose portion of a tip hose. [Figure 4] This is an explanatory diagram of this embodiment, and is a conceptual diagram showing the tip of a boom to which the concrete pouring device is attached. [Diagram 5] FIG. 2 is an explanatory diagram of the present embodiment, showing a front view of the restraining device. [Figure 6] FIG. 2 is an explanatory diagram of the present embodiment, showing a side view of the restraining device. [Figure 7] FIG. 2 is an explanatory diagram of the present embodiment, showing a plan view of the restraining device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will now be described with reference to the accompanying drawings. Here, a concrete pouring device 10 used in the concrete pumping method, in particular a concrete pouring device 10 used when pouring concrete using a vehicle equipped with a concrete pressure pump and a boom device 1, will be described. Note that the concrete pressure pump, boom device 1, and vehicle are assumed to be existing ones, and detailed description thereof will be omitted. The vehicle may also be a work ship equipped with a concrete pressure pump and a boom device 1.

[0011] As shown in Fig. 1, a concrete pouring device 10 has a tip hose 11 that is connected to a boom transport pipe 2 of a boom device 1 of a concrete pump vehicle (not shown) via a docking hose 3 and a tapered pipe 4. As shown in Fig. 2 or 3, the tip hose 11 has a connecting fitting 12 that is connected to the tip of the tapered pipe 4 (the end opposite to the end connected to the docking hose 3) using a joint (not shown), and a hose portion 15 that is formed in a flattened cylindrical shape except for a nearby portion 16 (see Fig. 4) that is within a certain distance from the connecting fitting 12.

[0012] As shown in Fig. 2, the connecting fitting 12 has a male threaded portion 19 (bamboo shoot portion) that is inserted into one end 15A (the end opposite the discharge port 18) of the hose portion 15, and a cylindrical sleeve 13 that is provided on the outer periphery of the male threaded portion 19. The one end 15A of the hose portion 15 is clamped between the sleeve 13 of the connecting fitting 12 and the male threaded portion 19, thereby preventing the hose portion 15 from coming loose from the connecting fitting 12. A steel pipe ("STKM13A" in this embodiment) is used for the sleeve 13. Furthermore, a Flat Chute (registered trademark) having a layer portion of rubber (elastic material) is used for the tip hose 11.

[0013] The concrete pouring device 10 has a restraining device 20 (restoring means, see FIG. 4) that restrains concrete remaining at the boom tip, more specifically, concrete remaining in the docking hose 3, tapered pipe 4, and the vicinity 16 of the tip hose 15, from falling and flowing out of the discharge port 18 of the tip hose 11 when the boom device 1 moves. As shown in FIGS. 5 to 7, the restraining device 20 has a pair of bolts 22, 22 (fully threaded bolts) that are joined (welded) to the sleeve 13 of the connecting fitting 12 and protrude radially outward from the sleeve 13, and a pair of arms 31, 31 provided on the outside of the mounting ring 21.

[0014] Here, the restraining device 20 is formed symmetrically in Figures 5 and 7. In other words, the restraining device 10 is formed symmetrically with respect to an axial plane S (see Figure 5) that includes a center line C (see Figure 5) of the sleeve 13 of the connecting fitting 12. Also, the up-down direction in Figures 5 and 6 will be referred to as the up-down direction for convenience.

[0015] 5 to 7, the arm 31 is formed by stacking a plurality of (three in this embodiment) band-shaped leaf springs (reference numbers omitted). The arm 31 has a fixed portion 33, the upper end of which is fixed to the mounting ring 21 by a bolt 22 and a nut 23, and an arm portion 35 that extends obliquely downward from the lower end of the fixed portion 33 while gradually approaching the axial plane S. In other words, the arm 31 is divided into the fixed portion 33 and the arm portion 35 by a bent portion 37 as a boundary.

[0016] The restraining device 20 is formed so that the lower end of the arm 31 on the left side (one side) in Fig. 5 comes into contact with the lower end of the arm 31 on the right side (the other side) in Fig. 5. The arm 31 is formed so that the tip 39 of the inner leaf spring is longer than the other leaf springs (the outer leaf spring and the middle leaf spring), and the tip 39 is formed in an R shape that opens outward. The pressure section 32 at the lower end (other end) of the arm 31 comes into contact with the flat section 17 of the hose section 15 of the tip hose 11 below the adjacent section 16 over the entire width direction of the arm 31 (the "left-right direction" in Fig. 6) when the restraining device 20 is attached to the sleeve 13 of the connecting fitting 12 of the tip hose 11 (see Fig. 4).

[0017] The restraining device 20 is configured such that the pressure portions 32, 32 of the pair of arms 31, 31 press against each other, thereby clamping the flat portion 17 of the hose portion 15 by the pressure portions 32, 32 of the pair of arms 31, 31. The clamping pressure by the pressure portions 32, 32 of the pair of arms 31, 31 can be adjusted by changing the number of leaf springs constituting each arm 31, 31. The bolt 22 is inserted from the inside of the arm 31 into a bolt insertion hole 34 formed in the fixing portion 33. A nut 23 is screwed onto the bolt 22 inserted into the bolt insertion hole 34 via a washer 24. The arm 31 is fixed to the outside of the sleeve 13 of the connecting fitting 12 by tightening the nut 23 screwed onto the bolt 22.

[0018] Next, the operation of the concrete pouring device 10 will be described. Here, the concrete pump method, more specifically, the procedure for pouring concrete into water using the above-mentioned concrete pouring device 10, will be described. First, the boom device 1 with the concrete pouring device 10 attached to the boom tip is operated to position the tip hose 11 at a pouring position in the water. At this time, since the hose portion 15 of the tip hose 11 is lightweight, a weight may be attached near the discharge port 18 (see FIG. 1) of the hose portion 15 to prevent the hose portion 15 from floating (floating up) in the water.

[0019] Next, the output of the concrete pump (not shown), i.e., the flow rate of concrete (fresh concrete), is adjusted so that the flat, cylindrical hose section 15 pulsates, and concrete pouring is started. By adjusting the flow rate of concrete so that the hose section 15 pulsates in this way, a braking effect can be obtained that applies the brakes to the concrete falling inside the hose section 15, and it is possible to suppress aggregate separation in the concrete, in which the cement base and aggregate separate.

[0020] On the other hand, the clamping pressure (spring constant) of the pair of arms 31, 31 of the restraining device 21 (restraint means), i.e., the number of leaf springs that make up the arms 31, 31, is adjusted so as not to impede the pulsation of the hose section 15 caused by the concrete being pumped, and so as to enable the boom tip (in this embodiment, "the docking hose 3, the tapered tube 4, the connection between the tapered tube 4 and the tip hose 11", etc.) that falls when the boom device 1 moves to be retained in the vicinity 16 of the hose section 15.

[0021] After a predetermined amount of concrete has been poured, the boom device 1 is operated to pull out the tip hose 11 from the poured concrete.

[0022] Here, in a conventional concrete pouring device that is not equipped with a restraining device 20 (restoring means), concrete (fresh concrete) remaining at the tip of the boom falls when the boom device 1 moves, and if the fallen concrete flows out from the outlet 18 of the tip hose 11, there is a risk that the spilled concrete will contaminate the water or fall on concrete that has already been poured in the water, reducing the quality of the concrete.

[0023] In contrast, in this embodiment, the flat portion 17 of the hose section 15 of the tip hose 11 is clamped by a pair of arms 31, 31 formed by stacking leaf springs, so that the clamping portions (pressure sections 32, 32) of the pair of arms 31, 31 can prevent concrete remaining at the tip of the boom from falling when the boom device 1 moves, and the fallen concrete is retained within the hose section 15 between the pair of arms 31, 31.In other words, the fallen concrete can be prevented from passing through the pressure sections 32 of the pair of arms 31, 31 and flowing downward (downstream).

[0024] According to this embodiment, it is possible to prevent concrete that has fallen from the tip of the boom from flowing out of the outlet 18 of the tip hose 11, thereby preventing the spilled concrete from contaminating the water or falling onto concrete that has already been poured in the water, thereby reducing the quality of the concrete.

[0025] In addition, in this embodiment, the hose portion 15 uses the flat, cylindrical tip hose 11 except for the adjacent portion 16, so that the amount of water that enters the hose portion 15 from the tip thereof during pouring underwater can be minimized. This makes it possible to prevent concrete from falling into the water that has entered the hose portion 15 and separation of aggregates caused by the flow of cement paste, thereby ensuring the quality of the poured concrete.

[0026] In addition, in this embodiment, the tip of the tip hose 11 is not provided with a valve for opening and closing the concrete discharge port, so that the tip hose 11 can be inserted into a narrow formwork to pour concrete.

[0027] The embodiment is not limited to the above-described form, and can be configured as follows, for example. In the above-described embodiment, the concrete pouring device 10 is applied to underwater pouring of concrete, but it can also be applied to air pouring. In addition, in the above-described embodiment, each arm 31, 31 is fixed to the sleeve 13 of the connecting fitting 12 by one bolt 22 and one nut 23, but each arm 31, 31 may be fixed to the sleeve 13 by multiple (e.g., "two") bolts 22 and nuts 23. Furthermore, the arms 31, 31 can be connected by a chain or the like to prevent the arms 31, 31 from rotating relative to the sleeve 13. [Explanation of symbols]

[0028] 10 concrete pouring device, 11 hose tip, 12 connecting fitting, 15 hose part, 18 discharge port, 20 restraining device (restraining means), 31 arm

Claims

1. A concrete pouring device used in a concrete pump construction method, A tip hose connected to a tip of the boom, and a suppression means for suppressing concrete remaining at the tip of the boom from falling and flowing out from a discharge port of the tip hose, The tip hose has a hose portion having a layer made of an elastic material and a cylindrical connecting fitting for connecting to the tip of the boom, The concrete pouring device is characterized in that the restraining means is arranged symmetrically with respect to a uniaxial plane of the connecting fitting, and has a pair of arms, one end of which is fixed to the connecting fitting and the other end of which cooperates to clamp the hose portion.

2. 2. The concrete pouring device according to claim 1, A concrete pouring device, characterized in that the arm is composed of a single leaf spring or multiple stacked leaf springs.

3. The concrete pouring device according to claim 1 or 2, A concrete pouring device, characterized in that the hose portion has a flattened cross-section.

4. 2. The concrete pouring device according to claim 1, the connecting fitting includes a male threaded portion that is inserted into one end of the hose portion, and a sleeve that is provided on an outer periphery of the male threaded portion and that clamps the hose portion between the male threaded portion and the sleeve, A concrete pouring device characterized in that the restraining means has a bolt protruding from the outer periphery of the sleeve and fixing the arm.

5. A concrete pumping method, comprising the steps of: pouring concrete into water using the concrete pouring device according to claim 1.

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