JPH0743158Y2 - Load-bearing body - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load bearing body applied to a removal anchor construction method.

[0002]

2. Description of the Related Art As a conventional removal anchor construction method, as shown schematically in FIG. 7, unbonded PC steel wire a
The steel wire is used to make a U-turn with the load bearing body C arranged at the tip of the anchor trunk body b, and both ends of the steel wire are pulled, tensioned and fixed to form the anchor, and the anchor is no longer required. In some cases, a method of extracting and removing only PC steel wire has been proposed.

After the construction of such a removal anchor construction method, the load bearing body is left in the ground, but the load bearing body is usually relatively long (for example, 30 to 70 cm) in consideration of the fixing property.
Since this is used and made of metal such as cast iron, there is a risk that it will become an underground obstacle after the construction is completed.

Further, when the removal anchor method is applied, the unbonded PC steel wire is fastened with a band to the load bearing body at the U-turn portion, but the PC steel wire tends to spread strongly due to the resilience. Not only is the band fastening operation not easy, but a gap tends to form between the load-bearing body due to the tendency to spread even after the band is fastened, and such a gap causes the infiltration of mortar, cement milk, etc.,
Not preferable.

The present invention has been made for the purpose of eliminating such conventional problems.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a tip head portion and a body portion detachably connected to the head portion, and the tip head portion and the body portion each include an unbonded PC.
A locking groove for U-turning the steel wire to lock the steel wire is provided, and a peripheral groove for band-fastening the PC steel wire locked in the locking groove to the main body portion is provided on the main body portion. The main body is composed of a plurality of split bodies which are separably connected in the lengthwise direction, and the rear end of the rearmost split body has a P
The present invention relates to a load-bearing body, characterized in that a terminal metal object for restraining a C steel wire in a U-turn state is coaxially and detachably connected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show an example of a so-called double-type load-bearing body of the present invention in which an unbonded PC steel wire is U-turned vertically and horizontally. The load-bearing body is made of metal such as cast iron or aluminum casting, or plastic, or the like. There is.

As shown in FIG. 1, the load-bearing body of the present invention comprises a load-bearing body portion 1 and a terminal hardware 2 coaxially connected to the rear end of the load-bearing body portion 1. The terminal hardware 2 is a joint portion. The load-bearing body portion 1 can be separated from the load-bearing body portion 1 by releasing the fitting of the uneven portions 3a and 3b.

The load bearing portion 1 is composed of a tip head portion 4 and a body portion 5, and the tip head portion 4 is provided with uneven portions 6a, 6 of a joint portion 6.
It can be separated from the main body 5 by releasing the fitting of b.

The tip head part 4 is of a bullet type and is composed of a front part 4a and a rear part 4b.
4b can be separated by uncoupling the concavo-convex portions 7a and 7b of the joint portion 7. The convex portion 7b is shown by hatching in FIG.

The main body 5 is elongated in the longitudinal direction and is usually 30
It has a length of about 70 cm and is composed of a plurality of, for example, three divided bodies 5a connected in the length direction. The divided body 5a can be separated from each other by uncoupling the concave and convex portions 8a and 8b of the joint portion 8 from each other.

The load-bearing body 1 is provided with a vertical locking groove 9 that makes a U-turn in the vertical direction and a horizontal locking groove 10 that makes a U-turn in the horizontal direction over the entire length thereof. Two pairs of unbonded PC steel wires a ₁ and a ₂ are locked in the grooves 9 and 10, respectively, at the folded-back portions a ₁₁ and a ₁₂ at the tips.

The vertical locking groove 9 is a vertically curved groove 9a formed vertically over the entire length of the tip head portion 4, and the vertically curved groove 9 is formed.
The upper and lower straight groove 9 extending in the axial direction formed on the upper and lower ends of the main body 5 so as to connect to the upper and lower ends of a.
b and 9b.

On the other hand, the lateral engaging groove 10 is a laterally curved concave groove 1 formed laterally over the entire length of the rear part 1b of the tip head portion 1.
0a, and left and right straight groove 10b, 10b extending in the axial direction formed at both left and right ends of the main body 5 so as to be connected to the upper and lower ends of the lateral curved groove 10a. ing.

The terminal metal fitting 2 is a thick-walled plate having a diameter substantially the same as or larger than that of the main body portion 5, and in the state of being coaxially connected to the main body portion 5, the vertical and horizontal locking grooves 9 are formed. Insertion holes 11 of the unbonded PC steel wire are formed at four positions at 90 ° intervals at positions corresponding to the rear ends of the No. 10 and 10. The divided body 5a has a circumferential groove 12 in the middle portion in the length direction, and the circumferential groove 12 is formed by connecting the unbonded PC steel wire in the vertical and horizontal locking grooves 9 and 10 to the band 14
(Refer to FIG. 1) for fastening, and the uneven shape serves to enhance the fixing property of the load bearing body. In order to improve the fixing property of the load-bearing body, the auxiliary circumferential groove 13 may be formed in the joint portions 3, 6 and 8.

The load-bearing body of the present invention is set on the folded portions a ₁₁ and a ₁₂ of the unbonded PC steel wires a ₁ and a _{2 in} the procedure shown in FIG. 6, for example.

First, as shown by the solid line in FIG.
The AND bond PC steel wire a ₁ on one side is inserted into the insertion holes 11 of the upper and lower groups to make a U-turn, and the folded-back portion a ₁₁ formed by this U-turn is drawn out a long time. Next, the unbonded PC steel wire a ₂ on the other side is inserted into the insertion holes 11 and 11 of the left and right sets of the terminal metal fitting ₂ to make a U-turn, and the folded-back portion a ₂₁ formed by this U-turn is also pulled out for a long time. However, the drawer length is slightly shorter than the previous one. Two pieces of PC steel wires a ₁ and a ₂ are used as one set.

Next, the load-bearing body portion 1 is inserted into the folded-back portion a ₂₁ in the left-right direction with the front part 4a of the tip head portion 4 removed, while pushing apart the PC steel wires of each set against the resilience. Then, the left and right folded-back portions a ₂₁ are locked in the lateral locking grooves 10 at the same time when the terminal metal fitting 2 is contacted by fitting the uneven portions 3a, 3b. When tightened in the direction indicated by the arrow 15 the PC steel wires a ₂ in FIG. 6 in this locked state, the folded portion a ₂₁ horizontal locking groove 10
The terminal is firmly locked in its entire length, and by the restraint force of the terminal metal piece 2, the locked state is stably retained thereafter regardless of the tendency of expansion due to repulsion elasticity.

Then, the front part 4a of the removed head part 4 is attached to the front end of the load-bearing part 1 by fitting the concave-convex parts 7a and 7b in the folded-back part a ₁₁ in the front-rear direction, and the remaining PC is left behind.
When the steel wire a ₁ is tightened in the direction shown by the arrow 16 in FIG. 6,
The folded-back portion a ₁₁ securely locks up to the entire length of the vertical locking groove 9 of the load-bearing body portion, and similarly to the case of the folded-back portion a _{21 described} above, the folded-back portion a ₁₁ receives the restraining force by the terminal metal fitting 2 and thereafter, Holds the locked state in a stable and reliable manner. This state is shown by a virtual line in FIG.

Next, by fastening with the band 14, the load-bearing body 1
On the other hand, the folded-back portions a ₁₁ and a ₂₁ of the PC steel wires a ₁ and a ₂ are firmly fixed, but the folded-back portions a ₁₁ and a ₁₂ are strong when they are inserted into the insertion hole 11 of the terminal hardware 2. Regardless of the impact resilience, since it is restrained in the U-shaped folded state, the fastening operation by the band 14 can be performed easily and safely. Further, since the band 14 is fastened under the restraint condition by the terminal metal fitting 2, the folded portion of the PC steel wire is not generated in the locking grooves 9 and 10 regardless of the strong impact resilience of the PC steel wire. , Can be firmly locked.

PC steel wires a ₁ and a ₂ folded back portions a ₁₁ and a ₂₁
The load-bearing body fixedly set on the PC steel wire a ₁ , a is fixed by being buried in the ground by the construction of the removal anchor method as usual.
After the removal and removal of ₂ , it is left as an embedded object in the ground, but the load-bearing body is not only separable into the tip head part, the main body part and the terminal metal object, but also the main body part is divided into a plurality of parts. Since it can be separated from the body, there is no risk of becoming an underground obstacle.

In the embodiment, the so-called double type in which the PC steel wire is U-turned on the load bearing body at two positions in the vertical direction and the horizontal direction has been described. However, for example, a single type in which the U-turn is made only in the vertical direction, In this case, the lateral locking groove 10 and the insertion hole 11 connected to it are omitted.

[0023]

Since the load-bearing body of the present invention is equipped with the terminal hardware capable of restraining the and-bonded PC steel wire in the U-turn state,
The band tightening work of the U-turn portion of the PC steel wire with respect to the load bearing body is facilitated, and the PC steel wire can be stably and reliably locked in the U-turn locking groove of the load bearing body without generating a gap. Further, the load-bearing body can be separated into the tip head portion, the main body portion and the terminal metal object, and the main body portion can be separated into a plurality of divided bodies, so that the risk of becoming an underground obstacle can be eliminated.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention and a usage state.

FIG. 2 is a front view of a front part of the tip head portion. .

FIG. 3 is a front view of the rear part.

FIG. 4 is a front view of a divided body.

FIG. 5 is a front view of the terminal hardware.

FIG. 6 is a schematic explanatory view of a usage state of the load bearing body of the present invention.

FIG. 7 is an explanatory view of a known removal anchor construction method using a load bearing body.

[Explanation of symbols]

 1 load-bearing body part 2 end hardware 3 joint part 4 tip head part 5 main body part 6 joint part 7 joint part 8 joint part 9 vertical locking groove 10 lateral locking groove 11 insertion hole 12 circumferential groove 13 auxiliary circumferential groove 14 band 15 arrow Mark 16 Arrow

Claims (1)

[Scope of utility model registration request] 1. A tip head portion and a body portion detachably connected to the head portion, wherein an unbonded PC steel wire is U-turned and locked to the tip head portion and the body portion. And a peripheral groove for band-fastening the PC steel wire locked in the locking groove to the main body portion are provided in the main body portion, respectively, and the main body portion is detachably long. It is composed of a plurality of divisions connected in the vertical direction, and at the rear end of the rearmost division, a terminal metal fitting for restraining the PC steel wire in a U-turn state is coaxial and separable. Load-bearing body characterized by being connected.