Method for scraping inner surface of hollow concrete pole

Abstract

To provide a scraping method capable of easily and quickly scraping off slag from an inner peripheral surface of a hollow concrete pole and forming the inner peripheral surface into a surface shape suitable for bonding.SOLUTION: The scraping method of the present invention includes: drilling a first work hole in a cylindrical wall of an aboveground exposed portion of a hollow concrete pole and drilling a second work hole below the first work hole; inserting a high-pressure water spray nozzle and a water supply hose capable of supplying water while supporting the nozzle through one of the first work hole and the second work hole; inserting a vacuum hose through the other work hole; chipping an inner peripheral surface of the cylindrical wall with high-pressure water from the nozzle; and sucking up muddy water containing the scraped-off slag with the vacuum hose. Whereby, high-pressure water spray from the nozzle and suction by the vacuum hose can be performed efficiently and in parallel without the use of a special device.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a method of scarifying the inner peripheral surface of a hollow concrete pole as a ground treatment before applying a reinforcement treatment to the hollow concrete pole used as a utility pole or a support pole for a signal.

Background Art

[0002] Conventionally, as a method of reinforcing a hollow concrete pole, as shown in Patent Documents 1 and 2 below, a working hole is drilled in the cylindrical wall of the concrete pole, and a bag-shaped reinforcing material is inserted and fixed into the concrete pole through the working hole, and a filling material is filled into the bag-shaped reinforcing material and cured, thereby reinforcing the hollow concrete pole from the inside. This method is known.

[0003] In these conventional reinforcement methods, it is important that the bag-shaped reinforcing material containing the filling material and the hollow concrete pole are integrated. Therefore, it is necessary to strongly bond the outer peripheral surface of the bag-shaped reinforcing material and the inner peripheral surface of the hollow concrete pole, and it is necessary to bond them in consideration of the weight of the filling material filled in the bag-shaped reinforcing material in particular.

[0004] By the way, in the manufacture of hollow concrete poles, centrifugal molding is generally used. When concrete is poured into a cylindrical formwork and the cylindrical formwork is rotated around its axial direction as the center of rotation, the concrete moves to the side of the cylindrical formwork by centrifugal force, and a hollow concrete pole is formed.

[0005] Therefore, while the outer peripheral surface of the hollow concrete pole is finished as a beautiful smooth surface by the formwork, sludge accumulates on the inner peripheral surface, and the accumulated sludge hardens to form irregular and brittle unevenness.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] Therefore, in the reinforcement work of a hollow concrete pole, due to the sludge generated on the inner peripheral surface of the hollow concrete pole, it may be difficult to adhere the inner peripheral surface to the outer peripheral surface of the bag-shaped reinforcing material, or even if adhered, the bag-shaped reinforcing material may slip off due to the weight of the filling material or the like.

[0008] In addition, Patent Document 2 discloses that the inner peripheral surface of the hollow concrete pole is washed in advance before the maintenance treatment. However, hardened sludge cannot be removed depending on the degree of washing, and the inner peripheral surface of the hollow concrete pole does not have a surface shape suitable for adhesion. MEANS FOR SOLVING THE PROBLEMS

[0009] The present invention provides a kerene method capable of easily and quickly and appropriately scraping the sludge on the inner peripheral surface of a hollow concrete pole to make the inner peripheral surface have a surface shape suitable for adhesion.

[0010] Specifically, a first working hole is drilled in the cylindrical wall of the above-ground exposed portion of the hollow concrete pole, and a second working hole is drilled below the first working hole. A high-pressure water jet nozzle and a water supply hose capable of supplying water while supporting the nozzle are inserted from one of the first working hole and the second working hole, and a vacuum hose is inserted from the other working hole. The sludge on the inner peripheral surface of the cylindrical wall is scraped with the high-pressure water from the nozzle, and the turbid water containing the scraped sludge is sucked in with the vacuum hose. Thus, without using a special device, the high-pressure water jet from the nozzle and the suction by the vacuum hose can be efficiently and simultaneously performed.

[0011] Preferably, the first working hole is drilled obliquely downward with respect to the cylindrical wall, and the second working hole is drilled obliquely upward with respect to the cylindrical wall, so that it becomes easier to guide the nozzle and the water supply hose above or below the inside of the hollow concrete pole. Also, it becomes easier to guide the vacuum hose below the inside of the hollow concrete pole.

[0012] Further, since the injection port of the nozzle is rotatable along the inner peripheral surface of the cylindrical wall, the inner peripheral surface can be appropriately chiseled.

[0013] Also, after sucking muddy water with the vacuum hose, a cementitious material is placed inside the hollow concrete pole and a bottom-lifting process is performed, so that even if the bag-shaped reinforcing material accidentally causes poor adhesion to the inner peripheral surface of the hollow concrete pole during the reinforcement work, slippage can be effectively prevented.

Advantages of the Invention

[0014] According to the method for chiseling the inner peripheral surface of the hollow concrete pole according to the present invention, the inner peripheral surface can be appropriately chiseled to form a surface shape suitable for adhesion.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0016] The optimal embodiment of the scoring method for the inner peripheral surface of a hollow concrete pole according to the present invention (hereinafter simply referred to as the "scoring method") will be described based on FIGS. 1 to 9.

[0017] The scoring method according to the present invention relates to a base treatment for constructing a reinforcing structure in which a bag-shaped reinforcing material 13 is placed in a hollow concrete pole 11 as shown in FIGS. 7 and 8, and a filler 14 such as a cementitious material is filled into the bag-shaped reinforcing material 13 and cured to integrate the hollow concrete pole 11 and the bag-shaped reinforcing material 13.

[0018] Specifically, it is a treatment for appropriately chopping the cured nolo existing on the inner peripheral surface 12a of the hollow concrete pole 11, specifically the inner peripheral surface 12a of the cylindrical wall 12, to make the inner peripheral surface 12a have a surface shape suitable for adhesion to the bag-shaped reinforcing material 13.

[0019] ≪Working Hole Drilling Step≫ In the scoring method according to the present invention, first, a working hole is drilled in the cylindrical wall 12 of the above-ground exposed portion of the hollow concrete pole 11.

[0020] The number of working holes to be drilled may be single, but preferably, as shown in FIG. 1, a pair of working holes with different height levels from the ground GL, that is, while drilling the first working hole h1, a second working hole h2 is drilled below the first working hole h1. This is for efficiently performing the chopping work and the vacuum work as described later. For example, the height t1 of the first working hole h1 from the ground GL is preferably in the range of 100 cm to 150 cm, and the height t2 of the second working hole h2 from the ground GL is preferably around 50 cm. In any case, it is important to drill within the reach of the operator and in a posture that is not strenuous, and to drill based on the required length of the working long hole H described later.

[0021] Preferably, as also shown in FIG. 1 and FIG. 5(a), the upper first working hole h1 is drilled to be inclined downward with respect to the cylinder wall 12, and the lower second working hole h2 is drilled to be inclined upward with respect to the cylinder wall 12. In other words, for the first working hole h1, the opening h1a on the inner peripheral surface 12a side of the cylinder wall is lower than the opening h1b on the outer peripheral surface 12b side of the cylinder wall, and for the second working hole h2, the opening h2a on the inner peripheral surface 12a side of the cylinder wall is higher than the opening h2b on the outer peripheral surface 12b side of the cylinder wall. By configuring the first working hole h1 and the second working hole h2 in this way, it becomes easier to guide the nozzle 1 for high-pressure water injection and the water supply hose 2 for supplying high-pressure water to the upper or lower part inside the hollow concrete pole. Also, the first working hole h1 makes it easier to guide the vacuum hose 3 to the lower part inside the hollow concrete pole.

[0022] ≪Chopping process and suction process≫ As described above, after drilling the first working hole h1 and the second working hole h2, start the chopping work on the inner peripheral surface 12a of the cylinder wall by the nozzle 1 for high-pressure water injection and the supply hose 2 for supplying high-pressure water to the nozzle 1, and the vacuum work of sucking the turbid water W containing the sludge cut off by the chopping work by the vacuum hose 3.

[0023] The nozzle 1 for high-pressure water injection preferably has an injection port rotatable along the inner peripheral surface 12a of the cylindrical wall 12. This is for appropriately planing the inner peripheral surface 12a. That is, as shown in FIGS. 1 to 4, when the nozzle 1 is moved along the axial direction of the pole 11 inside the hollow concrete pole 11, it is sufficient if the injection port rotates horizontally and planing work can be performed along the radius of the inner peripheral surface 12a of the cylindrical wall. As the rotation method of the injection port, any rotation method can be arbitrarily selected according to the implementation as long as it can rotate while injecting high-pressure water, including the rotation method by air, the rotation method by hydraulic pressure, the rotation method by electricity, etc.

[0024] In addition, as for the water supply hose 2, it goes without saying that it is necessary to have a strength and thickness sufficient to supply high-pressure water, but it is also necessary to have a strength that can support the nozzle 1 standing vertically. For example, a known hose for ultra-high pressure water, that is, a hose provided with a plurality of reinforcing layers formed by spirally winding high-tensile steel wires around the outer peripheral surface of a tube through which high-pressure water passes, can be used.

[0025] In addition, as for the vacuum hose 3, of course, it is necessary to have a certain thickness and strength in order to suck and lift the turbid water W containing sludge.

[0026] In the planing work and the vacuum work, as shown in FIG. 1, the nozzle 1 and the water supply hose 2 are inserted through the second working hole h2, and the nozzle 1 is lifted while standing vertically. At this time, since the second working hole h2 is inclined upward, the nozzle 1 and the water supply hose 2 can be smoothly guided upward.

[0027] Next, as shown in FIG. 2, after the nozzle 1 is above the first working hole h1, the vacuum hose 3 is inserted through the first working hole h1, and the turbid water W containing the planed sludge accumulated on the inner bottom surface 11a of the hollow concrete pole 11 is sucked and lifted. After that, the planing work by the nozzle 1 is also performed up to the vicinity of the inner top surface 11b of the hollow concrete pole 11, and at the same time, suction by the vacuum hose 3 is performed. Therefore, the water supply hose 2 and the vacuum hose 3 do not interfere with each other, and there is no work loss and it is efficient.

[0028] Also, when performing a chiseling operation on the lower inner peripheral surface 12a inside the hollow concrete pole 11, as shown in FIG. 3, the nozzle 1 and the water supply hose 2 are inserted through the first working hole h1 to perform the operation. At this time, since the first working hole h1 is inclined downward, the nozzle 1 and the water supply hose 2 can be smoothly guided downward. In addition, the vacuum hose 3 is inserted through the second working hole h2, and the turbid water W containing the chiseled sludge accumulated on the inner bottom surface 11a of the hollow concrete pole 11 is sucked in and pumped up.

[0029] Next, as shown in FIG. 4, after the nozzle 1 is positioned lower than the second working hole h2, in order to avoid damaging the vacuum hose 3 with high-pressure water, the vacuum hose 3 is removed. After the chiseling operation by the nozzle 1 is completed, the vacuum hose 3 is inserted through the first working hole h1 or the second working hole h2 to perform a vacuum operation.

[0030] In the chiseling operation, in order to smoothly reciprocate the nozzle 1 in the vertical direction, in the present invention, it is preferable to use a wheel device 21 as shown in FIG. 9. The wheel device 21 has a configuration in which a pair of wheels 22A and 22B are arranged to rotate in opposite directions to each other, and the pair of wheels 22A and 22B can send out and retract the water supply hose 2 by rotating while holding the water supply hose 2. The wheels 22A and 22B are preferably equipped with rubber tires so as to firmly engage with the water supply hose 2. In FIG. 9, 21a is the base of the wheel device 21, and 21b is the wheel that enables the base 21a to move self-propelled.

[0031] As described above, according to the chiseling method of the present invention, the inner peripheral surface 12a of the cylinder wall 12 is chiseled with high-pressure water from the nozzle 1, and the turbid water W containing the chiseled sludge can be sucked in by the vacuum hose 3, and the chiseling operation and the vacuum operation can be efficiently performed simultaneously in parallel.

[0032] ≪Formation of Working Long Hole≫ The first working hole h1 and the second working hole h2 used for the cutting operation and the vacuum operation can be transformed into working elongated holes for inserting the bag-shaped reinforcing material 13 used for the reinforcement treatment.

[0033] That is, by using the first working hole h1 and the second working hole h2 shown in Fig. 5(a), the working elongated hole H shown in Fig. 5(b) can be formed. The working elongated hole H can be formed simply by cutting vertically between the first working hole h1 and the second working hole h2. Also, due to the fact that the first working hole h1 faces downward and the second working hole h2 faces upward, as shown in Fig. 6, the opening Hb on the outer peripheral surface side of the cylindrical wall 12b becomes an elongated hole that is vertically longer than the opening Ha on the inner peripheral surface side of the cylindrical wall 12a, facilitating the insertion operation of the bag-shaped reinforcing material 13.

[0034] ≪Reinforcement Structure≫ By appropriately treating the inner peripheral surface 12a of the hollow concrete pole 11 according to the keren method according to the present invention, as shown in Fig. 7, the outer peripheral surface of the bag-shaped reinforcing material 13 containing the filling material 14 can be appropriately adhered to the inner peripheral surface 12a of the hollow concrete pole 11, and a reinforcement structure in which the bag-shaped reinforcing material 13 and the hollow concrete pole 11 are integrated can be constructed. Note that 13a in the figure is a balloon for temporarily fixing the bag-shaped reinforcing material 13. As shown in Fig. 7 and Fig. 8 to be described later, it is deflated as shown in the figure at the stage when the reinforcement structure in which the bag-shaped reinforcing material 13 and the hollow concrete pole 11 are integrated is constructed. However, when temporarily fixing the bag-shaped reinforcing material 13 before filling the filling material 14 at a desired position, it can be inflated near the inner top surface 11b of the hollow concrete pole 11 and its outer surface can be pressed against the inner peripheral surface 12a of the cylindrical wall 12.

[0035] In the present invention, after performing the cutting operation by the nozzle 1 and the vacuum operation by the vacuum pump, a cement-based material such as cement mortar is placed inside the hollow concrete pole 11 (inner bottom surface 11a) and raised to form the raised bottom 4, and the bottom-raising process is performed. As shown in FIG. 8, since the bag-shaped reinforcing material 13 can be supported by the raised bottom 4, it is possible to more reliably prevent the bag-shaped reinforcing material 13 from slipping off. Therefore, even if the bag-shaped reinforcing material 13 has poor adhesion to the inner peripheral surface 12a of the hollow concrete pole, it is possible to effectively prevent the slipping off.

Explanation of Signs

[0036] 1... nozzle, 2... water supply hose, 3... vacuum hose, 4... raised bottom, 11... hollow concrete pole, 11a... inner bottom surface, 11b... inner top surface, 12... cylinder wall, 12a... inner peripheral surface of the cylinder wall, 12b... outer peripheral surface of the cylinder wall, 13... bag-shaped reinforcing material, 13a... fixing balloon, 14... filling material, 21... wheel device, 21a... base, 21b... wheel, 22A... wheel, 22B... wheel, GL... ground, h1... first working hole, h1a... opening on the inner peripheral surface side of the cylinder wall, h1b... opening on the outer peripheral surface side of the cylinder wall, h2... second working hole, h2a... opening on the inner peripheral surface side of the cylinder wall, h2b... opening on the outer peripheral surface side of the cylinder wall, H... working elongated hole, Ha... opening on the inner peripheral surface side of the cylinder wall, Hb... opening on the outer peripheral surface side of the cylinder wall, t1... height of the first working hole, t2... height of the second working hole, W... turbid water.

Claims

1. A first working hole is drilled in the cylindrical wall of the above-ground exposed part of the hollow concrete pole, and a second working hole is drilled below the first working hole. A high-pressure water jet nozzle and a water supply hose capable of supplying water while supporting the nozzle are inserted from one of the first working hole and the second working hole, and a vacuum hose is inserted from the other working hole. The sludge on the inner peripheral surface of the above cylindrical wall is chopped with high-pressure water from the above nozzle, and the turbid water containing the chopped sludge is sucked in by the above vacuum hose. A method for removing sludge from the inner peripheral surface of a hollow concrete pole, characterized in that.

2. The first working hole is drilled while being inclined downward with respect to the above cylindrical wall, and the second working hole is drilled while being inclined upward with respect to the above cylindrical wall. A method for removing sludge from the inner peripheral surface of a hollow concrete pole according to Claim 1, characterized in that.

3. The jet outlet of the above nozzle is rotatable along the inner peripheral surface of the above cylindrical wall. A method for removing sludge from the inner peripheral surface of a hollow concrete pole according to Claim 1, characterized in that.

4. After sucking in turbid water with the above vacuum hose, a cement-based material is placed inside the above hollow concrete pole, and a bottom-lifting treatment is performed. A method for removing sludge from the inner peripheral surface of a hollow concrete pole according to Claim 1, characterized in that.

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