JP4015876B2 - Underwater concrete placement equipment - Google Patents

Description

[0001]
[Field of Invention]
The present invention relates to a concrete supply device used when placing underwater concrete.
[0002]
[Prior art]
In offshore civil works, when constructing offshore concrete structures, the ones made on land are installed as much as possible, but the concrete supply piping is dropped from the water to the underwater placement position and the underwater concrete is driven. Many have also been established.
[0003]
However, when placing underwater concrete, the concrete is washed away by the surrounding water to cause separation, resulting in a concrete having defects that the cement has flowed out, and the reliability of quality such as strength and density uniformity. Is significantly reduced.
[0004]
For this reason, the separated concrete cannot be used as a strength member, and a lot of useless concrete is generated in the water, which is uneconomical and causes pollution in the water.
[0005]
In order to solve such problems, a trememy method and a concrete pump method have been developed so far. As an example, as shown in FIG. 8, a single-opening fan-shaped gate 102 that can be opened and closed is provided at the tip of a concrete supply pipe 101, and concrete is placed in water by opening and closing the gate.
[0006]
However, in the single-opening fan-shaped gate 102, the concrete discharging direction in the gate 102 is limited to only one direction, so that the spread of the concrete placement is biased, and uniform concrete placement is difficult.
[0007]
Further, since a flow is generated only in one direction, a cavitation phenomenon in which a water flow or a vortex is generated on the lower side of the gate 102 occurs, and a large number of bubbles are generated in the concrete, causing a spot in the concrete density.
[0008]
Further, in the concrete pump method, a large discharge reaction force acts on the tube tip of the supply pipe 101 particularly at the time of discharge, and a force that moves the supply pipe 101 to the side opposite to the concrete discharge direction works.
[0009]
By the way, when placing underwater concrete, as shown in FIG. 5, concrete discharge is first started 20 to 30 cm above the bottom of the water, and as the discharge progresses, the concrete lump grows large, and the discharge starts accordingly. The outlet is always buried in the concrete to prevent the concrete from separating in the water, and the supply pipe is gradually pulled up to place the concrete.
[0010]
At this time, when a reinforced concrete structure having reinforcing bars is constructed in water, as shown in FIG. 5b, reinforcing bar rods in which the reinforcing bars are assembled in a three-dimensional grid are installed at the place where the concrete is placed. It is necessary to place a supply pipe inside.
[0011]
However, in the conventionally used single-opening sector gate 102, a cylinder 103 for opening and closing the gate 102 attached to the tip of the concrete supply pipe 101 is attached to the side surface of the concrete supply pipe 101 via a support member. For this reason, it is difficult to pass through the mesh of the reinforcing rods installed in a three-dimensional lattice, and it is difficult to put the concrete supply pipe 101 into the reinforcing rods installed.
[0012]
Moreover, when constructing a reinforced concrete structure in water, the quality and uniformity of the concrete, such as strength and density, are particularly important, unlike an unreinforced concrete structure in which only the weight of the concrete is a major factor in strength.
[0013]
[Problems to be solved by the invention]
The present invention has been made in view of such conventional problems, and provides a concrete feeding device for placing concrete underwater as a device capable of accurately placing concrete without biasing to an appropriate position. It is aimed.
[0014]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is such that an on-off valve for discharging and stopping concrete is attached to a discharge port provided at a lower end of a supply pipe in a supply device for placing underwater concrete. The means are as follows.
[0015]
1 specific means, below the discharge port provided at the lower end of the concrete supply pipe, the valve body moves in the vertical direction and the ejection stop and the discharge of concrete is provided, the valve body above the side surface of the concrete supply pipe Attach the power source to operate, it connects the animal power source and the valve body by a transfer member, concrete from between the discharge port and the valve body is formed by forming evenly releasable valve body in the entire circumferential direction In the underwater concrete placing device, the valve body is composed of a member composed of a hemispherical part or a truncated cone part and a flange projecting from a base end part of the hemispherical part or the truncated cone part, and is symmetrical with the flange as a center. The underwater concrete is characterized in that a hemispherical part or a truncated cone part is formed also at a position where the two parts are formed, the flanges are joined to each other by the flange, and any hemispherical part or the truncated cone part is disposed on the discharge port side. It is a driving device
[0016]
The specific means 2 is that the place to be placed is connected by sequentially connecting an upper supply pipe, an intermediate supply pipe, a bent supply pipe, a horizontal supply pipe, a bent supply pipe and a vertical lower supply pipe with a concrete supply pipe suspended. It is an underwater concrete placing device characterized in that concrete placement is possible at a construction position that is not at a hanging position at the end of the boom .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
[0018]
【Example】
FIG. 1 is a schematic diagram of an embodiment of the present invention.
The concrete produced on the concrete plant ship S is sent to a concrete transport pipe D supported by a boom B by a concrete pump P. The boom B is extended to the sky above the pouring position in the water, and the concrete supply pipes 11, 1 connected to the concrete transport pipe D are suspended from the tip of the boom B into the water. The water has entered.
[0019]
For example, when placing on the bottom of a water depth of 20 m, the concrete supply pipes 11, 1 consisting of a total length of 25 m of the underwater part 20 m and the upper part of the water 5 m are placed on the reinforcing bar R placed on the bottom and assembled in a three-dimensional lattice shape. Install at the installation position.
Each of the concrete supply pipes 11 and 1 is configured to have a length of 5 m, and is combined with the total length required for the construction by connecting the flanges 12 and 12 formed at both ends of the concrete supply pipe.
[0020]
The embodiment shown in the drawings is an example in which a reinforced concrete structure is constructed, and a three-dimensional lattice-shaped reinforcing bar rod R which is three-dimensionally assembled at a predetermined interval is installed in the water bottom G in advance, and a mold is formed around it. A frame F is provided.
[0021]
2 and 3 are partially cutaway elevational views showing the relationship among a concrete supply pipe, a valve body, a power source and a transmission member in one embodiment, FIG. 2 is a state in which the valve body 2 is opened, and FIG. The state which closed the body 2 is shown.
[0022]
In each figure, a valve body 2 for controlling the discharge of concrete is provided below the discharge port 6 of the concrete supply pipe 1 arranged at the concrete pouring position, and submerged above the concrete supply pipe 1. A cylinder 4 which is a power source for opening and closing the valve body 2 is attached to a position where the valve body 2 is not opened.
[0023]
The valve body 2 and the cylinder 4 are connected by a transmission member made of a steel bar 3 that transmits the acting force of the cylinder 4, and this steel bar 3 is also connected with a predetermined length by an appropriate connecting means. Can be formed.
[0024]
The steel bar 3 has a structure that is supported by being inserted into a hole 13 provided in a flange 12 that connects the concrete supply pipe 1. The steel rod 3 may be supported by the steel rod holding member 14 provided in the supply pipe 1.
[0025]
Moreover, when using the steel rod 3 with high rigidity, it replaces with the hole 13 provided in the above flanges 12, and is a U-shaped notch open | released from the center of the concrete supply pipe 1 toward an outer peripheral direction. It may be provided with a portion, which facilitates assembly and disassembly work.
[0026]
The valve body 2 of the embodiment shown in FIGS. 2 and 3 has a structure in which the upper and lower surfaces 7 form a spherical surface, and the inner peripheral edge of the discharge port 6 and the surface 7 of the valve body 2 are pressed and sealed. The discharge port is opened and closed by moving the valve body 2 up and down by the acting force of the cylinder 4 transmitted through the steel rod 3.
[0027]
When the concrete supply pipe 1 is suspended from the water, as shown in FIG. 3, the discharge port 6 of the concrete supply pipe 1 is closed by the valve body 2 by the operation of the cylinder 4, and then inside the concrete supply pipe 1. Fill with concrete and place it in the placement position.
[0028]
FIG. 4 is a horizontal cross-sectional view showing a state in which the concrete supply pipe 1 is inserted into a three-dimensional lattice-shaped reinforcing bar R installed on the bottom G.
FIG. 5 is an elevational view showing a state in which concrete is placed from the discharge port of the concrete supply pipe 1 disposed in water.
[0029]
As shown in FIG. 5b, a three-dimensional lattice-shaped reinforcing bar rod R is installed at a position where a reinforced concrete structure is constructed, and the discharge port 6 is inserted into the valve body in the grid of the reinforcing rod rod R assembled in the lattice shape. The concrete supply pipe 1 closed at 2 is inserted, and the discharge part 5 is arranged at a position 20 to 30 cm from the bottom G.
[0030]
Next, the cylinder 4 is operated to extend the steel material 3 as a transmission member, thereby opening the valve body 2 of the discharge port 6 and simultaneously operating the pressure feed pump P to start placing concrete.
[0031]
For example, as shown in FIG. 4, when the grid of the reinforcing bar ridge R is a 500 mm square, the maximum diameter of the flange 12 provided in the concrete feeding pipe 1 is set to 250 mm, so that the concrete feeding pipe 1 is connected to the reinforcing bar ridge R. Can be inserted into the mesh
[0032]
As shown in FIG. 5b, the concrete lump grows greatly from the concrete state placed from the concrete supply pipe 1 shown in FIG. 5a, and the discharge part 5 of the concrete supply pipe 1 is always moved accordingly. The concrete supply pipe 1 is gradually lifted upward while being placed while being kept buried in the concrete to prevent the concrete from separating in water.
[0033]
The operation of the supply device of the present invention will be described below with reference to FIGS.
FIG. 3 shows a state in which the valve body 2 provided at the discharge port 6 of the concrete supply pipe 1 is closed. By operating the cylinder 4 and pulling up the valve body 2 upward through the steel rod 3 as a transmission member, the discharge port 6 of the concrete supply pipe 1 and the pressure contact surface (upper surface) of the valve body 2 having a spherical surface. ) 7 is pressed and the concrete discharge is stopped.
[0034]
On the other hand, FIG. 2 shows a state in which the valve body 2 provided at the discharge port 6 of the concrete supply pipe 1 is open. When the cylinder 4 is actuated and the valve body 2 is pushed downward via the steel rod 3 as a transmission member, the discharge port 6 of the concrete supply pipe 1 and the crimping surface 7 of the valve body 2 are separated and the concrete is discharged. Is done.
[0035]
In this way, the valve body 2 is moved up and down with respect to the discharge port 6 of the concrete supply pipe 1 to open and close the discharge port 6. The discharge section 5 is configured as an all-round discharge structure that forms a uniform gap on the entire circumference of 360 degrees. Therefore, the concrete discharged from the discharge unit 5 is discharged evenly around the concrete supply pipe 1.
[0036]
In the above embodiment, the pressure contact surface 7 of the valve body 2 has a spherical shape, and the concrete discharged from the discharge port 6 of the concrete supply pipe is discharged very smoothly along the spherical surface of the valve body 2 to the entire circumference. .
[0037]
Further, since the crimping surface 7 of the valve body 2 is spherical, the displacement of the crimping surface 7, that is, the vertical movement distance of the steel rod 3 as a pair of transmission members is slightly different, and the valve body 2 is slightly inclined and discharged. Even if it contacts the outlet 6, there is no gap, and the valve body 2 has excellent sealing properties.
[0038]
FIG. 6 shows another embodiment of the valve body 2.
(A) is a valve body in which a pair of members each including a flange 22, a cylindrical portion 23, and a hemispherical portion 24 are joined by the flange 22.
(B) is a valve body in which a pair of members each composed of a flange 22 and a frustoconical portion 25 are joined by the flange 22.
(C) is the valve body which joined the member which consists of the flange 22 and the solid cone 26, and the flat disk-shaped member 27. FIG.
(D) is a valve body in which a flange 21 is provided on a solid sphere 28.
[0039]
2 and 3, in the same manner as the valve body shown in FIGS. 2 and 3, concrete is discharged from the discharge port 6 of the concrete supply pipe 1, and is placed so as to spread evenly around the discharge portion in the discharge direction. It can be performed.
[0040]
In particular, the valve element shown in FIGS. 6a and 6d can exhibit excellent sealing performance even when the valve element is slightly inclined, like the valve element shown in FIGS.
Further, in the valve body shown in FIGS. 6a, 6b, and 6d, when the crimping surface 7 is worn, by reversing and reattaching the valve body 2, the opposite surface that is not used is used as the crimping surface 7. Therefore, since one valve body 2 can be reused and the replacement work can be performed in a relatively short time, the construction efficiency is improved.
[0041]
Since the flange 12 is provided at the tip of the concrete supply pipe 1 shown in FIGS. 2, 3, and 6 a, b, it is possible to prevent the discharge port from being deformed when hit by an object. The flange 12 also has a function of guiding and holding a steel rod, which is a transmission member that transmits the operation of the cylinder 4.
[0042]
In the concrete supply pipe shown in FIG. 6c, the outer periphery of the discharge port is formed as a thick portion 15, and an annular ring 16 for guiding and holding the steel rod 3 is integrally provided thereabove.
[0043]
Moreover, the concrete supply pipe shown in FIG. 6d has a discharge port outer periphery formed as a thick portion 15, and a support piece 17 for guiding and holding the steel bar 3 is integrally provided thereabove.
[0044]
If these annular rings 16 and supporting pieces 17 are positioned on the surface of the concrete that gradually rises during concrete placement, the discharge port will always be present in the concrete for a certain length, facilitating the placement situation. Can be grasped.
[0045]
In the present invention, by providing the steel rod 3 that transmits the acting force of the cylinder 4, the cylinder 4 can be installed at a position away from the discharge portion 5 of the concrete supply pipe 1, and the valve body 2 in water can be operated. The amount of concrete discharged can be arbitrarily adjusted by controlling the opening / closing amount of the valve body 2.
[0046]
With such a structure, the cylinder 4 can be installed on the water surface without being submerged, and electrical equipment such as a reed switch for controlling the operation of the cylinder 4 can be easily attached. 4 may be provided in water.
In that case, if the cylinder 4 is provided above the height of the reinforcing bar assembly R installed on the bottom G, the discharge part of the concrete supply pipe 1 can be arranged on the bottom G through the mesh of the reinforcing bar R, There will be no hindrance to placement.
[0047]
In the above-described embodiment, the steel rod 3 is used as the transmission member to transmit the compression force and the tensile force from the cylinder 4 to the valve body. However, a member that transmits only the tensile force such as a wire is used as the transmission member. It can also be used.
In that case, the valve body 2 can be closed by transmitting the tensile force of the cylinder 4 with a wire, or the valve body 2 can be opened with the dead weight of the valve body 2 and the discharge pressure of the concrete by loosening the tensile force of the cylinder 4. .
[0048]
Next, another embodiment of the present invention will be described with reference to FIG.
This embodiment is used when there is some kind of obstacle above the planned placement location, and it cannot be placed with a supply device vertically suspended from the tip of a boom (not shown).
[0049]
An intermediate concrete supply pipe 92 is connected to the upper supply pipe 91 suspended from the boom via a swivel joint 8 so as to be rotatable about the axes of the concrete supply pipes 91 and 92.
[0050]
A horizontal supply pipe 94 that is slightly inclined in the horizontal or concrete flow direction is connected to the lower end of the intermediate supply pipe 92 via a bent supply pipe 93, and the lower end of the intermediate supply pipe 92 is connected to the lower end via a bent supply pipe 95. A vertical lower supply pipe 96 provided with the discharge part 5 is connected to the part.
In addition, since each supply pipe | tube is each made into desired length, what connected the several unit supply pipe | tube can be used.
[0051]
A pair of cylinders 4 is provided on the side surface of the intermediate supply pipe 92, and a wire 31, which is a transmission member that opens and closes the valve body 2 by the operation of the cylinder 4, is attached. Guide pipes 97 are attached to both side surfaces of the bent supply pipes 93 and 95 along the bends, and the wire 31 is inserted into the guide pipe 97.
In addition, as a transmission member, it is also possible to use a steel bar other than the part corresponding to the bending supply pipes 93 and 95.
[0052]
The preferred embodiments have been described above, but the present invention is not limited to them.
Generally known cylinders such as air cylinders and hydraulic cylinders are used as the power source. However, the power source is not limited to the cylinder, and a transmission member such as a steel rod or wire is connected to the valve body. Any device that can move by a distance necessary for opening and closing may be used.
[0053]
In the illustrated example, the valve body 2 is fixed to the end of the steel bar 3 by a pair of nuts so as not to move, but the upper nut is omitted and the valve body is moved upward with respect to the steel bar. You may provide so that it may accept | permit.
[0054]
In the embodiment, the transmission member for transmitting the cylinder operating force is formed by two (a pair) steel bars and wires, but three or four transmission members are arranged at equal intervals around the concrete supply pipe. May be.
[0055]
With such a structure, when stopping the placing of concrete, even if one cylinder or transmission member does not operate, the valve body is operated by the operation of the other two or three transmission members. The discharge port can be closed by raising.
[0056]
【The invention's effect】
As described above, according to the present invention, when placing concrete into water, it is possible to place the concrete so that the discharge direction of the concrete spreads evenly around the discharge portion, so that the density of the placed concrete can be increased. It is possible to construct high-quality underwater concrete structures without spots.
[0057]
In addition, it is possible to place concrete by placing concrete feed pipes at desired positions through the grids of rebar assemblies assembled in a three-dimensional grid, so that the strength and density are stable and the quality is uniform. Concrete construction is possible.
[0058]
Furthermore, since the present invention has a structure in which the valve body is closed by being crimped to the discharge port of the concrete supply pipe by the tensile force of the cylinder, the sealing performance is improved, and concrete leakage and water intrusion can be prevented.
[0059]
In addition, if the contact surface of the valve body that is crimped to the discharge port of the concrete supply pipe is worn, the surface on the opposite side that is not used can be used as the crimping surface by reversing and reattaching the valve body Since one valve element 2 can be reused and replacement work can be performed in a relatively short time, the construction efficiency is improved.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an embodiment of the present invention.
FIG. 2 is a partially broken elevation view showing a state in which a discharge part of the concrete supply pipe of the present invention is opened.
FIG. 3 is a partially broken elevation view showing a state in which the discharge part is closed.
FIG. 4 is a horizontal sectional view showing the relationship between the concrete supply pipe and the reinforcing bar assembly according to the present invention.
FIG. 5 is an elevational view showing a state of placing the underwater concrete of the present invention.
FIG. 6 is a partially broken elevation view of a valve body and a supply pipe showing another embodiment of the present invention.
FIG. 7 is a schematic view showing another embodiment of the present invention.
FIG. 8 is an elevational view showing a conventional discharge unit.
[Explanation of symbols]
S Concrete plant ship P Pressure pump B Boom D Concrete transport pipe G Water bottom R Reinforcing bar F Formwork 1 Supply pipe 11 Supply pipe 2 Valve body 3 Steel rod (Transmission member)
31 Wire (Transmission member)
4 Cylinder (Power source)
5 Discharge Port 6 Discharge Port 7 Crimp Surface 8 Swivel Joint 91-96 Supply Pipe 97 Guide Pipe

Claims (5)

Below the discharge port provided at the lower end of the concrete supply pipe, the valve body moves in the vertical direction and the ejection stop and the discharge of the concrete provided, Installing a power source for actuating the valve body above the side surface of the concrete supply pipe In the underwater concrete placing device formed by connecting the power source and the valve body with a transmission member, and forming the valve body from which the concrete can be evenly discharged from between the discharge port and the valve body , The valve body includes a member composed of a hemispherical part or a truncated cone part and a flange projecting from the base end part of the hemispherical part or the truncated cone part. Alternatively , an underwater concrete placing apparatus , wherein a frustoconical part is formed and the flanges are joined to each other, and any hemisphere or frustoconical part is disposed on the discharge port side . Under the discharge port provided at the lower end of the concrete supply pipe, a valve body that moves up and down to discharge and stop the discharge of concrete is provided, and a power source that operates the valve body is attached to the upper side surface of the concrete supply pipe, In the underwater concrete placing apparatus, wherein the power source and the valve body are connected by a transmission member, and the valve body is formed into a valve body capable of discharging concrete uniformly between the discharge port and the valve body in the entire circumferential direction. The body is composed of a solid sphere and a flange protruding from the center of the solid sphere, and a solid hemisphere is formed at a symmetrical position with the flange as a center. Is disposed on the discharge port side . By connecting the upper supply pipe, the intermediate supply pipe, the bent supply pipe, the horizontal supply pipe, the bent supply pipe, and the vertical lower supply pipe in which the concrete supply pipe is suspended, the place to be placed is not in the hanging position at the tip of the boom. The underwater concrete placement apparatus according to claim 1 or 2 , characterized in that concrete placement at a construction position is possible . 4. The underwater concrete placement according to claim 3 , wherein a pair of cylinders is provided on a side surface of the intermediate supply pipe, and the valve body is opened and closed by connecting the cylinder and the valve body with a transmission member made of a wire. apparatus. A continuous transmission member provided with a pair of cylinders on the side surface of the intermediate supply pipe, and connecting the cylinder and the valve body with a wire at a position to be a bent supply pipe and a steel rod at a position to be another linear supply pipe underwater concreting device according to claim 3, characterized in that formed by connecting the.

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