JPH061438U - Steel pipe inner surface cleaning device - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure that the inner surface of the steel pipe can be cleaned reliably and efficiently, and even if runout of the rotating shaft occurs, the inner surface of the steel pipe can always be cleaned cleanly. [Structure] On a support shaft 1 attached to a rotary shaft B, four brush attachment arms 2 are pierced through the support shaft so as to be orthogonal to each other, and the brush attachment arms are attached at vertically displaced positions. A cleaning brush 3 is attached to the tip of the brush attachment arm, and each brush attachment arm is fixed to a support shaft 1 by a fixing pin 5 so as to be movable in the length direction of the arm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for cleaning an inner surface of a steel pipe press-fitted into a pile hole when constructing a cast-in-place concrete pile.

[0002]

[Prior art]

 Conventionally, in the construction of cast-in-place concrete piles in which the head of the pile is reinforced with steel pipes, a pile hole was excavated using an excavation method such as the reverse construction method, the steel pipe was pressed into the pile hole, and then concrete was placed. A method of constructing a pile body is known. For example, in the case of the reverse method, excavated soil is discharged together with muddy water outside the pile hole by a suction pump.

[0003]

[Problems to be solved by the device]

 According to the conventional example, there is a problem that muddy water (stabilizing liquid) and excavated earth and sand adhere to the inner surface of the steel pipe, which reduces the adhesion between the steel pipe and the placed concrete.

An object of the present invention is to ensure that the inner surface of a steel pipe can be reliably and efficiently cleaned. The purpose of this invention is to ensure that the inner surface of the steel pipe can always be cleaned cleanly even if runout of the rotating shaft occurs.

[0005]

[Means for Solving the Problems]

 This invention comprises a support shaft, a plurality of brush mounting arms, and a cleaning brush. The support shaft is attachable to the rotary shaft and rotates about the shaft center. The brush mounting arm is mounted on the support shaft in a protruding state by shifting the position in the vertical direction, and a cleaning brush is mounted on the brush mounting arm. The protruding length of each mounting arm with respect to the support shaft can be adjusted. The brush mounting arm includes both a retractable arm and a non-stretchable arm. The expandable and contractible type is equipped with a pressing spring that presses the cleaning brush toward the steel pipe.

[0006]

[Action]

 The cleaning brush cleans the inner surface of the steel pipe as the support shaft rotates. Since the length of the brush mounting arm is adjusted according to the inner diameter of the steel pipe, the cleaning brush contacts the inner surface of the steel pipe at the optimum position.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The device according to the present invention comprises a support shaft 1, a brush mounting arm 2, and a cleaning brush 3.

As shown in FIGS. 1 to 3, the support shaft 1 has a rectangular tube shape, and a rotary shaft, for example, a kerry bar B (FIG. 5) of an earth drill excavator can be inserted therein. The support shaft 1 is detachably fixed to the kelly bar B at the positions of the fixing portions 1b and 1b.

The brush mounting arm 2 is horizontally mounted on the four outer surfaces of the support shaft 1 by vertically shifting the positions, and the cleaning brush 3 for cleaning the inner surface of the steel pipe P is attached to the tip of the brush mounting arm 2. Is attached. The brush mounting arm 2 penetrates the support shaft 1 and cannot be removed by the fixing pin 4 in the bearing pipes 1a, ... Which are fixed to the support shaft at equal intervals in the vertical direction as shown in FIG. Held in. In the illustrated example, the brush mounting arms 2 are arranged in four stages above and below, and there is no gap between the cleaning brushes 3 which are vertically adjacent to each other. Depending on the inner diameter of the steel pipe P, the brush mounting arm 2 can adjust the position of the cleaning brush 3 by adjusting the protruding length from the bearing pipe 1a. Therefore, as shown in FIG. 4, the brush mounting arm 2 is provided with a plurality of position adjusting holes 2c, ... Then, the position of the protruding length of the brush mounting arm 2 is determined by selecting an arbitrary position adjusting hole 2c and inserting the fixing pin 4. A rear end of a rod-shaped movable arm 2a is inserted into the tip of the brush mounting arm 2, and the movable arm is movably connected by a connecting pin 2b. The connecting pin 2b movably penetrates a long hole 2a1 formed in the movable arm portion 2a. The tip of the movable arm portion 2a is connected to the cleaning brush 3 with a screw 6.

A pressing spring 5 is wound around the movable arm portion 2a, and the pressing spring constantly urges the cleaning brush 3 to the steel pipe P side with a spring force. Therefore, when the cleaning brush 3 is applied with a predetermined pressing force or more, the cleaning brush 3 can be retracted against the spring force of the pressing spring 5, and the cleaning brush is protected.

Next, the method of using the pile and the method of using the pile will be described with reference to FIG. According to the inner diameter of the steel pipe P, the fixing pin 4 is loosened, the brush mounting arm 2 is moved in and out of the bearing pipe 1a, the protruding length thereof is adjusted, and the position of the cleaning brush 3 is adjusted. . Therefore, first, for example, by the earth drilling method, the pile hole H is excavated as shown in FIG. 5 (a), and then as shown in FIG. 5 (b), the diameter is equal to or slightly larger than the diameter of the excavated hole. The steel pipe P is press-fitted with a power jack, vibro hammer or kerry bar. After that, the supporting shaft 1 of this apparatus is attached to the lower end of the kelly bar B as shown in FIG. Then, since the cleaning brushes 3 arranged in the vertical direction have no gap between the cleaning brushes vertically adjacent to each other, the cleaning width is wide and the inner surface of the steel pipe P is cleaned efficiently. After cleaning, insert the rebar cage S and the tremie pipe T into the pile hole H as shown in Fig. 6 (d), slime them, and finally, as shown in Fig. 6 (e), inside the pile hole H. Place a concrete on.

When the center run-out of the kelly bar B occurs, the contact between the cleaning brush 3 and the inner surface of the steel pipe P may become insufficient, but the cleaning spring presses the inner surface of the steel pipe by the pressing spring force of the pressing spring 5. Since it is done, the dirt can be surely removed.

[0014]

[Effect of device]

 As described above, according to the present invention, by arranging the cleaning brushes at vertically displaced positions, the cleaning width per one rotation of the support shaft can be widened and efficient cleaning can be performed. Since the protruding length of the brush mounting arm can be adjusted, even if the diameter of the steel pipe changes, it can be handled without replacing the mounting arm, which is economical. Since the brush mounting arm is provided with a pressing spring and is expandable and contractible, the cleaning brush is always pressed against the inner surface of the steel pipe even if the runout of the rotating shaft occurs, so that dirt can be reliably removed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a plan view of FIG.

FIG. 4 is an enlarged sectional view showing a main part of the present invention.

FIG. 5 is a cross-sectional view showing a construction method for a cast-in-place pile.

[Explanation of symbols]

 1 Support Shaft 1a Bearing Pipe 2 Brush Mounting Arm 2a Movable Arm 2b Connecting Pin 2c Position Adjustment Hole 3 Cleaning Brush 5 Pressing Spring B Rotating Shaft (Keriever) P Steel Pipe

Claims (2)

[Scope of utility model registration request] 1. A support shaft that can be mounted on a rotary shaft and that rotates about an axis, and a plurality of brush mounting arms that are mounted on the support shaft in a protruding state by vertically shifting their positions. A cleaning pipe attached to a brush mounting arm, wherein each of the mounting arms is capable of adjusting a protruding length with respect to the support shaft. 2. The steel pipe inner surface cleaning device according to claim 1, wherein the brush mounting arm is a telescopic arm having a pressing spring that presses the cleaning brush toward the steel pipe.