JP4255076B2 - Difference anchor - Google Patents

Description

  The present invention relates to a differential anchor used when constructing a retaining wall or a partition wall.

  Conventionally, when constructing retaining walls, partition walls, etc., drill a pilot hole in a concrete frame with a drill, insert a differential anchor into this pilot hole, and hit the differential anchor with a hammer, The cotter pin attached to the anchor sleeve attached to the tip is forcibly driven into the anchor sleeve, and the lower part of the anchor sleeve is forcibly expanded by this driving and bites into the inner peripheral surface of the pilot hole. The difference anchor is integrated with the concrete frame. However, since the anchor sleeve is attached to the tip of the differential bar, it is necessary to drill a large pilot hole through which the anchor sleeve can intervene in the concrete frame. Moreover, if a large pilot hole is drilled, the strength of the concrete frame may be reduced.

  Therefore, by providing a hollow plug insertion part having a plurality of split grooves formed at the tip of the differential bar, and expanding the plug insertion part by inserting the plug, the differential bar is fixed to the lower hole. There has been proposed one that attempts to solve the above-mentioned problem by setting the hole diameter to be substantially the same as the difference bar outer diameter (for example, Patent Document 1). However, the processing and molding of the hollow plug insertion portion has a problem that a processing cost is high because a mold is required, and a product price is increased.

Further, in order to make the pilot hole as small as possible, the lower end of the differential bar is divided into one split groove, and a first cotter pin having a wedge portion inserted into the split groove and a wedge groove inserted into the first cotter pin are provided. Although the thing which provided the 2nd cotter pin which has is also proposed (for example, patent documents 2), if the above-mentioned 1st cotter pin is just struck into one split slot formed in the lower end of a difference line, it will be above the difference line. There is a risk that the first cotter pin will be pulled out due to the force of pulling out toward the head, and in order to prevent this, it is necessary to drive the second cotter pin into the first cotter and bend the differential muscle to hold each cotter pin. There are problems that the number of work steps increases, the work time becomes longer, the number of parts increases, and the product price increases.
JP-A-8-91857 Japanese Utility Model Publication No. 6-87432

  The problem to be solved by the present invention is to solve the above-mentioned problems, and to fix a low-profile anchor that is easy to construct and can be securely fixed to the lower hole, is easy to manufacture, has a small number of parts, and is inexpensive. It is to provide.

The differential anchor of the present invention that has solved the above-mentioned problems is provided with three or more forced expansions that are provided by radial cuts in a portion extending from the lower end of the differential bar main body to the required length and partitioned by the vertical cuts. For differential expansion in which an openable locking piece portion is formed, and at least three longitudinal long blade portions that are radially extended corresponding to the above-mentioned vertical cuts are formed at least at the front portion. Each of the above-mentioned vertically long blade pieces of the wedge-shaped driving member is inserted into the front end of the taper-shaped thick-walled portion within the cutting width of the vertical cut of the differential bar. Rutotomoni not follow the guide plate portion, characterized in that obtained by the tapered guide portion to the tip of the part of the front guide plate. The differential bar body used in such an invention is a deformed round steel in which a large number of nodes are arranged at a required interval, and the lowermost node is arranged at the lower part of each locking piece. Preferably, this is the invention of claim 2.

  As described above, the present invention provides three or more forcibly-expandable locking pieces that are provided by radial cuts in a portion extending from the lower end of the differential bar main body to the required length and are partitioned by the vertical cuts. The formed differential streaks, and a wedge-shaped driving member for forced expansion in which at least the three or more vertically long blade pieces radially extending corresponding to the above-described vertical cuts are formed at the front part. Therefore, the pilot hole drilled in the concrete frame can be made approximately the same as the outer diameter of the differential bar, so that the drilling time can be shortened and an inexpensive small-diameter drill can be used. The running cost can be reduced, and since the pilot hole can be made small, there is no possibility that the strength of the concrete frame will be lowered. Moreover, since the radial vertical cut can be easily formed by a rotating grindstone or the like, the production efficiency is high. In addition, since the vertical cut is radial, the lower end of the main body of the difference bar is divided into three or more, the contact surface to the lower hole of the locking piece portion is small, and it can bite deeply into the lower hole. It can be securely fixed to the pilot hole.

Next, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
In FIG. 1, 1 is a difference line. The differential bar main body of the differential bar 1 is made of deformed round steel having a large number of nodes 1a and ribs 1b connecting the nodes 1a. Reference numeral 2 denotes a locking piece that can be forcibly expanded and formed by radially cutting the vertical cuts 3 into the part of the required length below the differential bar 1 from the lower surface. As shown in each figure, the locking piece 2 is formed between the vertical cuts by providing about 3 to 6 vertical cuts having a required length from the lower end of the differential bar main body upward. As shown in FIG. 4, this portion is forcibly expanded in the lower hole 21 drilled in the concrete housing 20 and bites into the lower hole 21. Further, the lowermost node 1a of the deformed round steel bar is arranged at the lower part of the locking piece 2 so that the node 1a contacting the lower hole 21 has a non-slip effect on the lower hole 21 and has a fixing force. It is designed to be enhanced. Of course, the differential bar main body is not limited to the deformed round steel but may be an ordinary round steel.

  Further, as shown in each drawing, the locking piece portion 2 in the illustrated example is cut into a cross shape up to a height of 22 mm from the lower end surface, and is divided into four locking piece portions 2 defined by the radial vertical cuts 3. However, the number of the locking piece portions 2 is preferably 3-6. The reason for this is that the contact area of the locking piece 2 with the lower hole 21 increases as the locking piece 2 becomes smaller. However, when six or more locking pieces 2 are formed, the locking piece 2 This is because the strength is insufficient, and the locking piece 2 is bent without biting into the lower hole 21 when forcibly expanding, and there is a possibility that no fixing force is generated. In addition, in the two locking pieces divided into two by one notch groove, it is difficult to generate a sufficient biting force with respect to the lower hole 21, so the vertical cutting is performed so that there are three or more locking pieces. 3 must be formed radially.

On the other hand, reference numeral 4 denotes a wedge-shaped driving member for forced expansion, which is formed on three or more vertically long blade pieces 4a having at least a tip portion extending radially corresponding to the above-described vertical cuts 3. The longitudinal blade piece 4a of the wedge-shaped driving member 4 has a thin flat plate-shaped tip guide plate portion 5 corresponding to the cut width of the vertical cut 3 of the differential line at the tip of the tapered thick portion. together shall have the tip of the part of these front guide plate as tapered guide portion as shown in FIGS. 1 and 5 can smoothly driving on top which can accurately easily intervention in longitudinal cut 3 It is like that. Then, the wedge-shaped driving member 4 inserts the radially extending tip guide plate portion 5 into the radial vertical cuts 3 so that the wedge-shaped driving members 4 are sandwiched between the vertical cuts 3 as shown in FIG. Thus, it is only necessary to temporarily fix the differential bar 1 and drive it in, so that the workability is improved, and it is possible to prevent the occurrence of defective products due to the wedge-shaped driving member 4 dropping off. It should be noted that the taper-like thick portion does not reach the base end of the wedge-shaped driving member 4 as shown in the figure, and the base portion may be left as a round bar.

  In the illustrated example, the wedge-shaped driving member 4 has a cross-sectional shape with a height of 20 mm and a cross shape that is about 2 mm lower than the depth of the vertical cutting 3, but this is only the height of the wedge-shaped driving member 4. In order to obtain the amount of expansion necessary for generating a predetermined fixing force in this manner, the locking piece 2 is not expanded to the specified amount of expansion unless the is securely driven. It is.

  In the structure as described above, first, a predetermined number of holes 21 for attaching the differential bars 1 to the concrete frame 20 at the position where the partition wall is constructed are drilled. The inner diameter of the lower hole 21 is substantially equal to the outer diameter of the differential bar 1. When the lower hole 21 is drilled, the lower end of the differential bar 1 is inserted into the lower hole 21 so that the locking piece 2 is disposed in the lower hole 21. The wedge-shaped driving member 4 is temporarily fixed to the vertical cut 3. If the lower end of the differential bar 1 is inserted into the lower hole 21 in this way, as shown in FIG. 4, if the upper end of the differential bar 1 is hit with a hammer 30, the vertically long blade portion of the wedge-shaped driving member 4 is used. 4a is driven into the radial vertical cut 3 of the differential bar 1, and when the tap is continued further, the longitudinal wing piece 4a is driven into the radial vertical cut 3 and the locking piece 2 is shown in FIG. As shown in the figure, it is expanded in the outer peripheral direction, so that the locking piece portion 2 bites into the inner peripheral surface of the lower hole 21 via the node 1a formed on the outer surface of the locking piece portion 2, and the differential bar 1 is It will be fixed to the lower hole 21.

  In this way, after the difference bars 1 are erected on the concrete frame 20 at a predetermined interval, the reinforcing bars are assembled with the difference bars 1 as a support, and then a mold is formed around the reinforcing bars to put the concrete. The construction of the partition wall is no different from the conventional method.

It is a partially cutaway perspective view showing a preferred embodiment of the present invention. It is a partially cutaway front view showing a preferred embodiment of the present invention. It is a partially notched front view which shows the state which temporarily fixed the wedge-shaped driving member to the difference line. It is a partially notched front view which shows the use condition in preferable embodiment of this invention. Ru perspective view showing another embodiment of the different wedge hammering member shape of the tip portion.

Explanation of symbols

1 Difference
1a Section 2 Locking piece 3 Radial vertical cut 4 Wedge-shaped driving member
4a Long blade part 5 Tip guide plate
5a Tapered guide part

Claims (2)

The differential bar which provided the vertical cut in the part ranging from the lower end of the differential bar main body to the required length radially, and formed three or more compulsorily expandable locking pieces divided by each vertical cut, and the above-mentioned A wedge-shaped driving member for forced expansion, in which three or more vertically elongated blade pieces radially extending corresponding to the vertical cutting are formed in at least the front portion. each longitudinal wing portion which is one Rutotomoni, of the front guide plate was followed a thin front guide plate portion to be inserted into the notch width of the longitudinal notches of Sasuji the other party of the tapered thick portion A differential anchor having a tapered guide at the tip of the portion.   The differential bar main body is a deformed round steel in which a large number of nodes are arranged at a predetermined interval, and a lowermost node is disposed at a lower part of each locking piece. Difference muscle anchor.

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