JP2000291372A - Concrete block for inner excavation type shaft construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete block capable of shortening a time needed for integration of upper and lower concrete blocks with each other, assuring the positioning at the time of connection, preventing a play or displacement from occurring at connection positions, and facilitating the production of the concrete blocks. SOLUTION: Six box-shaped joint screw lever mounting fittings 7, guide pipes for knock pin, and an anchor bar 8 are fixed to the inside of a steel band 1 installed at the bottom end of a main body C at equal intervals, joint screw lever inserting holes 9 for the joint screw lever mounting fittings 7 are formed larger than a joint screw lever, a tapered recessed part 9a is provided in the upper part thereof, and a tapered washer 11 is fitted into the joint screw lever inserting hole 9 so as to form a joint tightened with nuts 12. Then, the joint A fixes six joint screw lever mounting nuts 2, two guide pipes for knock pin, and the anchor bar 8 on the inside of the steel band 1 installed at the upper end of the main body C at equal intervals, and screws the anchor screws 6 on the underside of the joint screw lever mounting nuts 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint which is used by being attached to an end of a concrete block for a shaft construction method using a shaft by rotary press-fitting, rocking press-fitting, or plain excavation. The present invention relates to a concrete block attached to an end thereof, which exhibits an excellent effect when performing the above.

[0002]

2. Description of the Related Art When a concrete block for the construction of a shaft is constructed by rotary press-fitting or rocking press-fitting,
1. 1. A method in which steel bands or steel rings or end plates provided at the ends of the upper and lower concrete blocks are connected by welding. 2. A method of embedding an anchor nut (embedded nut) in a concrete block and connecting it with a binding plate, Although they are integrated by a method such as connecting with an adhesive and settled by a rotary press machine or an oscillating press machine, each connecting method has the following problems.

That is, 1. There is a problem that the method of (1) requires time for welding. The method of (2) has a problem that "displacement" or "play" occurs in the upper and lower concrete blocks at the time of rotation or rocking press-fitting, and the plate becomes a resistance at the time of press-fitting. The method has a problem that it takes time until the adhesive is solidified.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to reduce the time required for integrating upper and lower concrete blocks,
Ensuring alignment at the time of connection, "play" at the connection point,
It is an object of the present invention to provide a concrete block having a joint capable of preventing "displacement" and simplifying concrete block production.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is an invention in which a suitable number of steel bands are provided inside a steel band attached to the lower end of a tubular concrete block. The box-shaped joint screw rod mounting bracket, the guide pipe for the knock pin and the anchor are fixed at appropriate intervals, the joint screw rod insertion hole of the joint screw rod mounting bracket is provided one size larger than the joint screw rod, and the tightening nut is used. A tapered recess is provided in the joint, and a tapered washer is fitted in the joint screw rod insertion hole, and a joint tightened with a nut is formed. A steel band attached to the upper end of the tubular concrete block has an appropriate number of joint screws inside. The rod mounting nut, the knock pin guide pipe and the anchor are fixed at appropriate intervals, and the anchor screw is mounted on the concrete embedded side of the joint screw rod mounting nut. A concrete block for formula vertical shaft construction method dug in, characterized in that to constitute a screwed joints to.

According to a second aspect of the present invention, a tapered eccentric washer is used in place of the tapered washer according to the first aspect of the present invention.

[0007]

[Function] A steel band having a joint according to the present invention fixed at both ends of a centrifugal mold is placed, and concrete is injected into the mold and centrifugally molded to form a digging with joints at both ends. The concrete block for the shaft construction method is completed.

[0008] The completed tubular concrete block,
When connecting another tubular concrete block to the top,
The lower cylindrical concrete block has the side with the joint screw rod mounting nut facing up, and the upper cylindrical concrete block has the side with the joint screw rod mounting bracket facing down. Insert the knock pin into the guide pipe for the knock pin of the attached joint, screw the joint screw rod into the joint screw rod mounting nut, and move the upper cylindrical concrete block to be connected to the upper part from the lower cylindrical concrete block upward. At the same time as inserting the knock pin protruding into the guide pipe for the knock pin of the upper cylindrical concrete block, insert the joint screw rod into the joint screw rod insertion hole of the joint screw rod mounting bracket, and attach a rubber seal for waterproofing and a taper. The center of the upper and lower tubular concrete blocks is tightened by tightening the joint screw rod with a nut via a washer. Match, securely integrated, runout of the upper and lower concrete block also with a rotary press fit machine or rocking press fitting machine rotation does not occur is obtained. Further, by making the knock pin longer than the screw rod, the screw part of the joint screw rod is not damaged.

Further, since the joint screw rod insertion hole is provided so as to be slightly larger, even when the upper tubular concrete block is overlapped, even if the mounting position of the buried joint screw rod mounting nut is slightly displaced from a predetermined position, The joint screw rod insertion hole does not become impossible to insert the joint screw rod unlike the case of a normal round hole, and the joint screw rod insertion hole and the joint screw are tightened by the effect of the tapered hole and the tapered washer. The rod is centered, and after tightening, there is no displacement or play in the direction of rotation or swing. Therefore, it is possible to easily cope with an error in the manufacturing accuracy of the joint manufacturing. Since the joints according to the present invention are fixed to the steel band, the joint can be provided only by setting the steel band in the mold, and the cost for manufacturing the joint can be reduced. .

The use of the tapered eccentric washer makes it possible to absorb a manufacturing error of the block.

[0011]

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

FIG. 1 is a vertical cross-sectional view of a concrete block for a hollow shaft construction method according to the present invention, wherein A and B are joints provided vertically and C is a cylindrical concrete block main body. FIG. 2 is a top view of the concrete block main body showing the structure of the joint A, and FIG. 3 is a bottom view of the concrete block main body showing the structure of the joint B. FIG. 4A is an enlarged cross-sectional view of the joints A and B of the connecting portion when the cylindrical concrete block main body C is overlapped, and FIG. 4B is an inner view thereof.

The joint A is provided with joint screw rod mounting nuts 2, 2, 2, 2, 2, 2 as shown in FIG. 2 through a nut base 3 inside the steel band 1, and as shown in FIG. The dowel pin guide pipes 4 and 4 are welded at equal intervals of 6 and 2 respectively, and a joint screw rod 5 is provided above the screw hole 2a of the joint screw rod mounting nut 2 as shown in FIG.
And an anchor screw 6 with a T-hook on the lower side.

The joint B is provided inside a steel band 1 and has a box-shaped joint screw rod mounting bracket 7, 7, 7, 7, 7, as shown in FIG.
The guide rods 7 and 7 and the guide pipes 4 and 4 for knock pins as shown in FIG. 5 are welded at equal intervals of 6 and 2 respectively, and an anchor rod 8 is provided.
Are provided on both sides of each joint screw rod mounting bracket 7, 7, 7, 7, 7, 7.

Each joint screw rod mounting member 7 is provided with a joint screw rod insertion hole 9 having a tapered recess 9a as shown in FIG. 4 (a). The joint screw rod insertion hole 9 is provided one size larger than the joint screw rod 5.

Therefore, as shown in FIG. 4, in order to connect the concrete blocks C and C, when they are stacked, a rubber packing 10 for waterproofing and a tapered washer 11 are inserted between the joint screw rod insertion hole 9 and the nut 12. When the nut 12 is tightened, the tapered washer 11 engages with the tapered recess 9a, so that the joint screw rod 5 is inserted into the tapered joint screw rod insertion hole 9.
It is centered in the center and can be completely tightened.

Further, the joint according to the present invention employs a method in which the joint screw rod 5 shown in FIG. 4 and the knock pin 13 shown in FIG. 5 are connected, and the joint screw rod 5 is subjected to shearing force due to tensile stress or frictional resistance of the contact surface. The stress and the knock pin 13 correspond to the shearing stress, respectively. Since both of them are embedded in the concrete block, they do not become resistance (obstruction) at the time of press-fitting. The concrete block can be pressed into the concrete block without any displacement. 4 and 5, 1
4 is a waterproof rubber ring.

Also, since the joint screw rod mounting nut 2 or the joint screw rod mounting bracket 7 and the knock pin guide pipe 3 are fixed to the steel band 1, the joint can be set only by setting the steel band 1 in the formwork. Since it is possible to manufacture a concrete block with attached parts, it is not necessary to install anchor nuts (embedded nuts) to attach the joints to the formwork as in the past, and it is not necessary to remove the joint bolts to attach the anchor nuts. can do.

The anchor screw to be attached to the lower side of the screw hole 2a of the joint screw rod mounting nut 2 may be an anchor screw 6 'with a J hook shown in FIG. 6, or is limited to these embodiments as long as it has a function of an anchor. Of course not.

In the embodiment shown in FIG. 4, a tapered washer 11 is used. However, in the case of this type of concrete block, a distortion that cannot be centered due to the tapered washer occurs due to its manufacture. Floats and cannot be completely tightened, causing looseness. However, the use of the tapered eccentric washer 11 'shown in FIG.

In the embodiment exemplified above, the box-type joint screw rod fitting of the inside opening type is used, and the joint screw rod is tightened from the inside of the concrete block. Needless to say, the present invention can also be applied to a type in which a joint mounting rod is tightened from the outside of a concrete block using a rod mounting bracket.

[0022]

As described above, the joint according to the present invention is
Suitable for the manufacture of concrete blocks with joints, whose structure is relatively simple and easy to assemble into the formwork. In addition to being easy and reliable to connect at the construction site, it is also required to have a bonding force against shear stress. The present invention can provide a concrete block having a joint sufficiently resistant to rotary press-fitting and swing press-fitting.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a top view of the concrete block main body showing the structure of the joint A according to the embodiment of the present invention.

FIG. 3 is a bottom view of the concrete block main body showing the structure of the joint B according to the embodiment of the present invention.

FIGS. 4A and 4B are enlarged views showing details of a joint screw rod mounting bracket in the embodiment of the present invention, wherein FIG. 4A is a longitudinal sectional view and FIG.

FIG. 5 is an enlarged view showing details of a guide pipe for a knock pin according to the embodiment of the present invention, where (a) is a longitudinal sectional view and (b).
Is an external view.

FIG. 6 is a side view of an anchor screw with a J hook.

FIG. 7 is an enlarged longitudinal sectional view showing an embodiment of the invention described in claim 2.

[Explanation of symbols]

 A Joint B Joint C Concrete block main body 1 Steel band 2 Joint screw rod mounting nut 3 Nut base 4 Dowel pin guide pipe 5 Joint screw rod 6 T-hook anchor screw 7 Joint screw rod mounting bracket 8 Anchor rod 9 Screw rod insertion hole DESCRIPTION OF SYMBOLS 10 Rubber packing for waterproofing 11 Washer with taper 12 Nut 13 Dowel pin 14 Waterproof rubber ring

Claims (2)

[Claims] An appropriate number of box-shaped joint screw rod mounting brackets, knock pin guide pipes and anchors are fixed at appropriate intervals inside a steel band attached to a lower end portion of a cylindrical concrete block, and the joint screw rod is fixed. The joint screw rod insertion hole of the mounting bracket is provided one size larger than the joint screw rod, and a tapered recess is provided on the side where the tightening nut is used. On the inside of the steel band attached to the upper end of the tubular concrete block, an appropriate number of joint screw rod mounting nuts, guide pipes for knock pins and anchors are fixed at appropriate intervals, and the joint screw rod mounting nut is embedded in concrete. A concrete block for a construction method for a middle shaft shaft, comprising a joint having an anchor screw screwed on a side thereof. 2. The concrete block according to claim 1, wherein an eccentric washer with a taper is used as a washer to be fitted into the tapered recess of the joint screw rod insertion hole.