JP4619838B2 - Joint cutting device and joint construction method using the same - Google Patents

Description

  The present invention relates to a joint cutting device for forming joints to be put in place in order to prevent cracks and the like in pavement such as concrete and asphalt.

  In concrete pavement, joints are applied at predetermined intervals as a cushioning element that absorbs the expansion or contraction to prevent cracking. This joint is in an uncured state during concrete placement, and is constructed using a vibration joint cutter as shown in Non-Patent Document 1. The vibration joint cutting machine is a machine that forms a cut by moving a cutting knife of an iron plate up and down and press-fitting into a concrete construction surface.

“Paving Construction Handbook”, December 4, 2001, first edition, first edition, edited / published by: Japan Road Association, page 279

  It is difficult to measure the joint timing of concrete pavement before hardening depending on the concrete slump, temperature, etc., especially in the case of a vibration joint cutter, after inserting the cutting knife and pulling it out. The edge of the cut joint groove collapses or sags due to the softness of the concrete, and the joint is partially blocked, which makes it difficult to insert the joint material (slate plate or the like). As a result, the work efficiency, flatness, and appearance are affected, such as a lot of reworking with the iron.

  The present invention pays attention to such a problem, and proposes a joint cutting device that makes it easy to insert joint materials by preventing collapse and sagging of joint grooves, and a joint construction method using the joint cutting device.

  The joint cutting device of the present invention has two plate-like blade members having a leading edge as a cutting blade, and the two blade members are V-shaped around the leading end side by hinge members provided on both side ends thereof. Hinged so as to be openable and closable, and an operation member for opening and closing is provided on the rear end side of the blade member, and the blade member is opened in a V-shape with a joint between the leading edges of the blade member. It is characterized by creating a gap through which the material can pass.

  And the joint method for concrete pavement according to the present invention using such a joint cutting device is a step of cutting the joint by press-fitting a closed blade member from the leading edge into the construction surface of the uncured concrete pavement. Opening the press-fitted blade member with an operation member, inserting a joint material between the opened blade members, and leaving the inserted joint material in the joint by passing through a gap between the leading edges. And a step of pulling out the member from the construction surface.

  According to this joint cutting device and joint construction method, while pressing the wall surface of the joint groove with the side surface of the press-fitted blade member, the joint material can be inserted between them, thereby preventing the edge of the groove from collapsing and sagging. A joint material can be inserted into the joint. Further, since the joint material can be inserted through the blade member opened in a V-shape, the work for inserting the joint material is much easier. In addition, it enables manual work that press-fits and opens / closes by holding the operating member in hand, which helps to reduce costs.

  In the joint cutting device of the present invention having such characteristics, a cylindrical member that holds a vibrator that vibrates the blade member is provided at the rear end of the blade member in consideration of making the press-fitting work easier according to circumstances. You can also keep it.

  According to the present invention, since the joint member is inserted while holding the wall surface of the joint groove by the V-shaped blade member that can be opened and closed, it can be slid like a conventional vertically moving cutting knife. The trouble of the joint groove does not occur, and the joint of the joint material can be easily inserted into the joint by preventing the edge of the groove from collapsing and sagging. Further, by inserting the joint material through the blade member opened in a V-shape, the joint material insertion work is much easier, and the workability is greatly improved. Therefore, the hardness of the concrete, that is, the construction timing does not need to be as nervous as before, and a high-quality joint can be constructed efficiently.

  1 to 5 show a preferred embodiment of the present invention. 1 to 3 show the entire joint cutting device, and FIGS. 4 and 5 show an outline of the construction process by enlarging the blade member pressed into the concrete pavement.

  The joint cutting device according to the present embodiment includes two long plate-like blade members 1, a hinge member 2 that hinges the blade member 1 so as to be openable and closable in a V-shape, and opens and closes the blade member 1. And an operation member 3 serving as a handle.

  Each blade member 1 has a long side edge 1a as a cutting blade, and in the case of this example, it is sharply formed so as to be easily press-fitted. A flange 1b is formed by bending the rear end portion on the side opposite to the tip edge 1a into an "L" shape, and an operation in which a bar is bent into a "U" shape on the flange 1b. A member 3 is erected by welding its both ends. Further, a holding cylinder 1c for holding a vibrator (not shown) for applying vibration so as to be easily press-fitted into the concrete is welded in the middle of the flange 1b of one of the blade members 1.

  The hinge member 2 is welded to the end surfaces of both side ends 1d of the blade member 1. The hinge member 2 of this example is formed by pivotally supporting plate members 2a and 2b longer than the side end of the blade member 1 at the tip portion by a hinge shaft 2c, and opens and closes in a V shape. Since the blade member 1 is connected near the rear ends of the plate members 2 a and 2 b, the hinge shaft 2 c is set at a position protruding earlier than the tip edge 1 a of the blade member 1. Therefore, a gap d is formed between the leading edges 1a in a state where the blade member 1 that opens and closes in a V shape according to the hinge member 2 is opened. The gap d is set to a value that allows the joint material M (slate plate or the like) to be inserted into the joint to pass therethrough.

  The joint construction method for performing joint cutting on concrete pavement using the above joint cutting apparatus is as follows.

(1) In the case of this example, a joint cutting device in which the length of the blade member 1 is set more than the construction width is prepared, and the blade member 1 is closed over the entire construction surface width of the uncured concrete pavement C. Then, the leading edge 1a is pushed up. And it press-fits, applying a vibration with the vibrator hold | maintained at the holding cylinder 1c, and cuts a joint.

(2) Operate by holding the operating member 3 from both sides, and open the press-fitted blade member 1 in a V-shape like a “flunger”, and make the wall surface of the joint groove V-shaped by the side surface of the blade member 1. Push out. Then, the joint material M is inserted between the open blade members 1, and the tip portion of the joint member M is slightly sunk into the concrete pavement C through the gap d between the tip edges 1a. It should be almost flush with the upper surface of the pavement C.

(3) The blade member 1 is pulled out from the joint while passing the inserted joint material M through the gap d, and the joint cutting device is removed while leaving the joint material M in the joint. Then, the edge of the joint where the joint material M is inserted is corrected with a trowel and finished.

  According to the joint construction method using this joint cutting device, the joint material M can be inserted while pressing the wall surface of the joint groove with the side surface of the press-fitted blade member 1. Therefore, the joint material M can be easily inserted. Further, the blade member 1 opened in a V shape plays a role like a “funnel” (or a guide plate), and when the joint material M is inserted through the blade member 1, the insertion work is much easier. Further, manual operation for press-fitting / opening / closing by holding the operation member 3 in the hand is possible, which is useful for cost reduction.

The side view of the joint-cutting apparatus which concerns on this invention. The end view which looked at the joint cutting apparatus of FIG. 1 from the side end. FIG. 3 is an end view corresponding to FIG. 2 viewed in a V shape. The end view which expanded the blade member cut into the construction surface and was seen from the side end. FIG. 5 is an end view corresponding to FIG. 4 when the blade member is opened in a V shape and a joint material is inserted.

Explanation of symbols

1 Blade member 1a Front edge 1b Flange (rear end)
1c Holding cylinder 1d Side end 2 Hinge member 2a, b Plate material 2c Hinge shaft 3 Operation member M Joint material

Claims (3)

  There are two plate-like blade members having a leading edge as a cutting blade, and the two blade members are hinged so as to be openable and closable in a V shape with the leading end as an axis by hinge members provided on both side ends thereof. In addition, an operation member for opening / closing operation is provided on the rear end side of the blade member so that a gap through which the joint material can be passed between the front end edges of the blade member in a state where the blade member is opened in a V shape. A joint cutting device characterized by that.   The jointing device according to claim 1, wherein a cylindrical member that holds a vibrator that vibrates the blade member is provided at a rear end of the blade member. A joint construction method for concrete pavement using the joint cutting device according to claim 1 or 2,
On the construction surface of uncured concrete pavement, a process of cutting the joint by pressing the blade member in a closed state from the tip edge;
Opening the press-fitted blade member with the operating member, and inserting a joint material between the opened blade members;
A joint construction method comprising: a step of pulling out the blade member from the construction surface while leaving the inserted joint material in the joint by passing through a gap between the tip edges.

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