Pouring chute and concrete pouring method

Abstract

To provide a placing chute capable of improving workability and reducing cost in placing concrete, and to provide a concrete placing method using the same.SOLUTION: In a cylindrical placing chute 1 guiding fresh concrete C to a concrete placing place, a plurality of cylindrical divided bodies 3, 3, ... are vertically and detachably connected. A height of the cylindrical divided body 3 is set to be a height corresponding to a concrete placing cycle. To an upper end and a lower end of the cylindrical divided body 3, elements 4 engaging with each other are fixed. The cylindrical divided bodies 3 that are vertically arranged are connected by engaging the elements 4 with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a concrete pouring chute and a concrete pouring method. [Background technology]

[0002] When pouring concrete, it is common to keep the height difference from the concrete pouring port of the pouring chute or pouring hose to the pouring position within 1.5 m to prevent deterioration of the quality of the poured concrete (for example, separation of the concrete). Also, when constructing a relatively large concrete structure, the concrete is poured in layers up to 50 cm high. For example, when pouring concrete using a casting hose, pouring of concrete is started with the concrete pouring port (lower end) of the casting hose positioned at a predetermined height (e.g., 1.5 m) from the bottom of the pouring area, and the concrete pouring port is raised as the top surface of the poured concrete rises. When raising the concrete pouring port, the casting hose is cut at a predetermined length (e.g., 50 cm) interval with a cutter or the like according to the height of each layer when the concrete is poured, so that the height position of the concrete pouring port is within 1.5 m from the top surface of the concrete. However, cutting the casting hose by hand is time-consuming. In addition, the cut casting hose cannot be reused and is disposed of. Patent Document 1 also discloses a casting chute made of a cylindrical sheet material, which is attached to the concrete discharge port of a hopper. This casting chute can be divided along the axial direction, and when the casting chute is raised as the top surface of the concrete rises, the casting chute is divided, making it possible to adjust the height from the concrete casting port to the casting location according to the progress of concrete pouring without the need for manual cutting. However, the casting chute of Patent Document 1 may be an obstacle because the divided sheet material accumulates around the concrete discharge port of the hopper. In addition, the casting chute of Patent Document 1 has rollers that guide the divided sheets, but the device around the discharge port of the hopper is large-scale, which may be an obstacle to work and an obstacle to cost reduction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-256767 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to propose a concrete pouring chute that makes it possible to improve workability and reduce costs when pouring concrete, and a concrete pouring method that utilizes this concrete pouring chute. [Means for solving the problem]

[0005] The casting chute of the present invention, which solves the above-mentioned problems, is a cylindrical casting chute for guiding concrete to a concrete casting location, and is made up of a plurality of cylindrical segments connected vertically in a detachable manner. The height of the cylindrical segments is set to a height according to the concrete casting cycle. In addition, elements that mesh with each other are fixed to the upper and lower ends of the cylindrical segments. The device also includes a slider that sequentially meshes the elements from the meshing start end toward the meshing end, and a stopper that is fixed to at least one of the upper end and the lower end of the cylindrical divided body and that stops the slider at the meshing end. The stopper is a band-shaped body with one end fixed to the cylindrical divided body and fasteners fixed to both ends that fit together. The cylindrical divided bodies arranged vertically are By operating the slider The elements are connected by meshing with each other. Furthermore, with the other end of the stopper inserted through the slider, the stopper is bent at the middle portion to engage the fasteners, thereby fixing the slider to the meshing end end. According to this casting chute, since it is configured by detachably connecting cylindrical division bodies having a height according to the concrete casting cycle, by removing the cylindrical division bodies according to the concrete casting cycle, the concrete casting port can be adjusted to a height position according to the progress of concrete casting. Therefore, it is not necessary to cut the casting chute with a cutter or the like, and the labor required for cutting can be omitted, and by reconnecting the removed casting chute, it can be reused as a long casting chute. The cylindrical division bodies are joined together via so-called fasteners that mesh the elements together, so that the cylindrical division bodies can be easily attached and detached. In addition, since the cylindrical division bodies can be removed individually, the excess part of the casting chute can be quickly removed without interfering with the work. Furthermore, if a cylindrical protective body is provided whose upper part is fixed to the inner surface of the cylindrical partition and whose lower end protrudes lower than the element fixed to the lower end of the cylindrical partition, it is possible to prevent cement, fine aggregate, etc. from adhering to the fastener (element) for joining the cylindrical partitions together.

[0006] The concrete pouring method of the present invention includes a pouring step of pouring concrete onto the top surface of an existing concrete layer through a pouring chute, and an adjustment step of adjusting the length of the pouring chute to pour concrete onto the top surface of the existing concrete layer to build a new concrete layer. The pouring chute is formed into a continuous cylinder by connecting a plurality of cylindrical divisions, and in the adjustment step, the distance from the top surface of the poured concrete to the lower end of the pouring chute is adjusted to a predetermined height. The stopper is removed from the slider, and the slider is operated to A portion of the cylindrical divided body is removed to raise the lower end of the concrete pouring chute. According to this concrete pouring method, the height position of the lower end of the concrete pouring chute (concrete pouring opening) can be easily raised by removing the cylindrical divided body according to the progress of the concrete pouring work. In other words, the work of cutting the concrete pouring chute to adjust its length can be eliminated, and the removed cylindrical divided body can be reused for another concrete pouring location. It is preferable that the height of the cylindrical division bodies is the same as the height of the concrete layer, and that one cylindrical division body is removed each time a new concrete layer is laid. Effect of the Invention

[0007] According to the pouring chute and concrete pouring method of the present invention, there is no need for cutting work using a cutter or the like when pouring concrete, which improves workability and makes it possible to reduce costs by using it repeatedly. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front view showing the concrete pouring chute of this embodiment in use. [Diagram 2] FIG. [Diagram 3] FIG. 4 is an enlarged view of a joint between two cylindrical sections. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In this embodiment, a concrete pouring chute 1 used when pouring concrete will be described. Fig. 1 is a diagram showing a concrete pouring situation using the concrete pouring chute 1. The concrete shall be poured in multiple layers (concrete layers C1, C2) of up to 50 cm in height, and dropped so that the height difference (concrete fall height) H1 from the concrete pouring opening 11 at the bottom end of the pouring chute 1 to the pouring position is within 1.5 m (see Figure 1).

[0010] In this embodiment, as shown in Fig. 1, fresh concrete C pumped above a concrete pouring location through a transport pipe 2 is guided to a concrete pouring location A by a pouring chute 1. The pouring chute 1 is cylindrical, with an upper end connected to the transport pipe 2 and a lower end opening toward the concrete pouring location. That is, the lower end of the pouring chute 1 is a concrete pouring opening 11 for pouring fresh concrete C into the concrete pouring location. The concrete pouring chute 1 is composed of a plurality of cylindrical divided bodies 3, 3, ... which are detachably connected to one another in the vertical direction. FIG.

[0011] The length (height) L1 of each cylindrical divided body 3 is 50 cm according to the concrete pouring cycle (height of concrete layers C1, C2). Elements 4 that mesh with each other are fixed to the upper and lower ends of the cylindrical divided body 3, and one of the elements 4 (the element 4 provided at the lower end of the cylindrical divided body 3 in this embodiment) is provided with a slider 5 that sequentially meshes the elements 4 with each other from the meshing start end to the meshing end. Fig. 3 shows the joint between the cylindrical divisions 3. The cylindrical divisions 3 arranged above and below are connected to each other by operating the slider 5 to mesh the elements 4 with each other, as shown in Fig. 3.

[0012] A stopper 6 for fastening the slider 5 to the meshing end is fixed to at least one of the upper end and the lower end of the cylindrical divided body 3 (the lower end in this embodiment). The stopper 6 is shown in FIG. 4. The stopper 6 is a strip-shaped body with one end fixed (for example, sewn or glued) to the outer surface of the cylindrical divided body 3. Fasteners 61, 62 that fit together are fixed to both ends of the stopper 6, and the stopper 6 can be folded in the middle to engage the fastener 62 at the other end with the fastener 61 at one end. The slider 5 of this embodiment is also formed with an annular holding portion 51. When the slider 5 is fixed by the stopper 6, the other end of the stopper 6 is inserted through the holding portion 51, and the fastener 62 at the other end is engaged with the fastener 61 at one end, as shown in FIG. 3.

[0013] As shown in FIG. 2, the cylindrical divided body 3 is provided with a cylindrical protective body 7. The cylindrical protective body 7 is made of a cylindrical sheet material. An upper end 71 of the cylindrical protective body 7 is fixed to the inner surface of the cylindrical divided body 3. A length L2 of the cylindrical protective body 7 is greater than the height from the fixing point of the upper end 71 to the cylindrical divided body 3 to the lower end (element 4) of the cylindrical divided body 3. Therefore, a lower end 72 of the cylindrical protective body 7 protrudes downward from the element 4 fixed to the lower end of the cylindrical divided body 3. In other words, when the cylindrical divided bodies 3 are joined together, the cylindrical protective body 7 covers the inner surface of the joint portion between the cylindrical divided bodies 3 (the meshing portion between the elements 4).

[0014] Next, a concrete pouring method for constructing a concrete structure using the pouring chute 1 will be described. In this embodiment, fresh concrete C is poured onto the top surface of an existing concrete layer C1 to form a new concrete layer C2. The construction of the concrete structure is carried out by repeating a pouring process and an adjustment process.

[0015] In the casting process, fresh concrete C is dropped through a casting chute 1 onto the bottom surface of the construction site of the concrete structure or onto the top surface of an existing concrete layer C1. The fresh concrete C is transported through a transport pipe 2. The transport pipe 2 is connected to a concrete pump (not shown) and transports the fresh concrete C pumped by a complete pump to a predetermined position (above the casting site). The transport pipe 2 of this embodiment is provided with a branch pipe (T-shaped pipe) 21. The branch pipe 21 of this embodiment is branched into a straight section 23 connected to another transport pipe 22 that guides the concrete to another casting site, and a branch section 24 to which the upper end of the casting chute 1 is connected. A valve (not shown) for switching the concrete transported through the transport pipe 2 to the straight section 23 or the branch section 24 may be provided near the branch pipe 21 or the branch pipe 21. The fresh concrete C pumped through the transport pipe 2 is guided to the casting chute 1 by the branch pipe 21, and is dropped into the casting location from the concrete casting opening 11 of the casting chute 1. Once the fresh concrete C has been poured to a predetermined height (i.e., once a new concrete layer C2 has been formed), the pouring of the fresh concrete C into the casting location is stopped by operating the complete pump or valve.

[0016] In the adjustment process, the length of the casting chute 1 is adjusted. That is, the height of the lower end of the casting chute 1 is raised so that the lower end of the casting chute 1 does not come into contact with the poured concrete when pouring concrete in the next cycle. The length of the casting chute 1 is adjusted so that the distance (height H3) from the top surface of the concrete layer C2 to the bottom end of the casting chute 1 (concrete pouring opening 11) is equal to or greater than the height (50 cm) of the concrete layer to be formed in the next cycle. At this time, the distance (height H3) from the top surface of the newly constructed concrete layer C2 to the bottom end of the casting chute 1 (concrete pouring opening 11) is adjusted to within 1.5 m. The length of the concrete pouring chute 1 is adjusted by removing the cylindrical division body 3a provided at the lower end of the concrete pouring chute 1. In this embodiment, since the height of the cylindrical division body 3 and the height of each concrete layer are the same, one cylindrical division body 3 is removed each time a new concrete layer C2 is laminated.

[0017] According to the concrete pouring chute 1 of this embodiment, since it is configured by detachably connecting the cylindrical divided bodies 3 having a height according to the concrete pouring cycle, the height of the concrete pouring opening 11 can be adjusted according to the progress of concrete pouring by removing the cylindrical divided bodies 3 according to the concrete pouring cycle. Therefore, it is not necessary to cut the concrete pouring chute 1 with a cutter or the like, and the labor required for cutting can be saved. In addition, if the removed cylindrical divided bodies 3 are connected again, they can be reused as the concrete pouring chute 1, which is economical. The cylindrical segments 3 are joined together using so-called fasteners that mesh the elements 4 together, making it easy to attach and detach the cylindrical segments 3. In addition, since each cylindrical segment 3 can be removed, the excess portion of the casting chute 1 can be quickly removed without interfering with work. The removed cylindrical segments 3 can be stored in a folded or stacked state in a place that does not interfere with work.

[0018] In addition, the inner surfaces of the joints between the cylindrical segments 3 are covered with the cylindrical protective body 7, which prevents cement, fine aggregate, and other materials contained in the concrete flowing down the pouring chute 1 from adhering to the teeth (fasteners) of the elements 4. In other words, it is possible to prevent cement, etc. from adhering to the teeth of the elements 4 and hardening, causing malfunction of the slider 5. In addition, a stopper 6 is fixed to the tubular section 3 to hold the slider 5, which sequentially meshes the elements 4 with each other from the meshing start end toward the meshing end end, at the meshing end end, thereby preventing the slider 5 from moving when pouring concrete (i.e., the joints between the tubular sections 3 opening and causing the poured concrete to leak out) and the tubular section 3 from falling when pouring concrete. In addition, according to the concrete pouring method of this embodiment, the height position of the lower end of the pouring chute 1 (concrete pouring opening 11) can be easily raised by removing the cylindrical portion 3 according to the progress of the pouring work, resulting in excellent workability.

[0019] Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and each of the above-described components can be appropriately modified without departing from the spirit of the present invention. In the above embodiment, the case where the tubular divided bodies 3 are joined together by a fastener having a slider 5 has been described, but the method of joining the tubular divided bodies 3 together is not limited as long as it is detachable, and may be, for example, a hook-and-loop fastener. In the above embodiment, the height from the concrete pouring opening 11 (lower end) of the pouring chute 1 to the pouring point (top surface of the existing concrete layer C1) is within 1.5 m, but this height may be determined appropriately depending on the applicable specifications, construction conditions, etc. In the above embodiment, the length (height) of the cylindrical divided body 3 is set to 50 cm to match the concrete layer to be constructed, but the length of the cylindrical divided body 3 may be appropriately determined depending on the height of the concrete layer, the height from the pouring port to the pouring height determined in the specifications, etc. The height of the concrete layer is not limited to 50 cm, and may be appropriately determined depending on the specifications applied to the construction, the construction conditions, the shape of the structure to be constructed, etc.

[0020] The number of cylindrical divided bodies 3 to be removed in the adjustment step may be appropriately determined according to the height of the upper surface of the existing concrete layer (the distance between the upper surface of the concrete layer and the lower end of the pouring chute 1). Depending on the height of the concrete layer and the length (height) of the cylindrical divided body 3, the placing step may be performed multiple times and then the adjusting step may be performed once. In the above embodiment, in the adjustment process, the cylindrical divided body 3 provided at the lower end of the casting chute 1 is removed, but it is also possible to remove the cylindrical divided body 3 other than the lower end (for example, the upper end) and reconnect the remaining cylindrical divided bodies 3. [Explanation of symbols]

[0021] 1. Concrete chute 11 Concrete pouring hole 2 Transport pipe 21 Branch pipe 22 Other transport pipelines 23 Straight section 24 Branch 3. Cylindrical division 4. Elements 5. Slider 6 Stopper 61,62 Fastener 7 Cylindrical protection body C. Fresh concrete C1, C2 concrete layers

Claims

1. A cylindrical concrete pouring chute for guiding concrete to a concrete pouring location, A plurality of cylindrical divided bodies are connected vertically in a detachable manner, The height of the cylindrical divided body is set according to a concrete pouring cycle, The cylindrical divided body has upper and lower ends to which elements are fixed so as to mesh with each other, A slider that sequentially meshes the elements with each other from a meshing start end to a meshing end end; a stopper fixed to at least one of the upper end and the lower end of the cylindrical divided body for stopping the slider at the meshing end, the stopper is a band-shaped body having fasteners fixed to both ends thereof, one end of which is fixed to the cylindrical divided body, The cylindrical divided bodies arranged vertically are connected to each other by engaging the elements with each other by operating the slider, This concrete pouring chute is characterized in that, with the other end of the stopper inserted into the slider, the stopper is bent at the middle portion to engage the fasteners, thereby fixing the slider to the meshing terminal end.

2. A cylindrical protective body is provided, the upper part of which is fixed to the inner surface of the cylindrical divided body, The concrete pouring chute according to claim 1, characterized in that the lower end of the cylindrical protective body protrudes downward beyond the element fixed to the lower end of the cylindrical divided body.

3. A method for pouring concrete on an existing concrete layer to form a new concrete layer, comprising: A pouring step of pouring concrete onto an upper surface of an existing concrete layer through the pouring chute according to claim 1 or 2; and an adjustment step of adjusting the length of the concrete pouring chute, The concrete pouring chute is composed of a plurality of cylindrical division bodies connected in the axial direction, This concrete pouring method is characterized in that in the adjustment process, the stopper is removed from the slider and the slider is operated to remove at least one of the cylindrical segments and raise the lower end of the pouring chute so that the distance from the top surface of the poured concrete to the lower end of the pouring chute is a predetermined height.

4. 4. The method for pouring concrete according to claim 3, wherein the height of the cylindrical divided body is the same as the height of the concrete layer, and one cylindrical divided body is removed each time a new concrete layer is laid.

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