JP2002013144A - Device for removal of continuous wall core pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for removal of continuous wall core pile capable of assuring a safety in the connection plate 3 bolt removal operation by eliminating such a risk that a soil pressure from an earth 5 side applies to the connection plate 3 and the connection plate 3 may be slid and collapsed by a shearing force to the excavating part 6 side along vertical end faces 1' and 1' when the uppermost staged wide flange shape steel 1 from the next-staged wide flange shape steel of a core pile material formed of a plurality of connection wide flange shape steels 1 suspended into an underground continuous wall 10. SOLUTION: In this removal device for continuous wall core pile, the connection plate 3 coming into contact with both upper and lower outer surfaces of the upper and lower stage flanges 2 and 2 in the same plane as the upper and lower stage wide flange shape steels 1 and 1 allowed to abut on upper and lower end faces 1' and 1', the bolts and nuts 4 and 4' for screwing the upper and lower stage flanges 2 and 2 with the connection plate 3, and upper and lower stage flanges 2 and 2 and the connection plate 3 are screwed into the nuts 4' fixed to the flanges 2 and 2 on the earth 5 side or a female screw hole 20 formed in the connection plate 3 so that the tip male screw part 4 of the bolt 4 having a head part 4a on the flanges 2 and 2 sides on the excavating part 6 side can be detached, the upper and lower stage wide flange shape steels 1 and 1 can be connected detachably, and reinforcement plates 7 and 7 through the upper and lower stage wide flange shape steels 1 and 1 are disposed on both sides of a web 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention perforates a relatively soft ground with an earth auger or the like, raises the earth auger while pouring cement milk into the perforation, and forms a soil cement column by hardening of cement milk and excavated earth and sand. When forming a continuous wall in the ground by lining up, core piles made of H-shaped steel are protruded and buried in the soil cement columns, and H
The present invention relates to a joining / separating device for joining shaped steels and ascending and separating the uppermost H-shaped steel to the ground.

[0002]

2. Description of the Related Art Heretofore, when joining a core pile material of an underground continuous wall, bolts have been joined by wrapping the entire surface of the pile with a joining plate.
In order to disassemble the joint after excavation, the mortar (soil) between the narrow columns must be removed to the ground side and then the joint bolt must be dismantled and removed. It is extremely difficult to remove the joint bolts on the surface and the earth pressure on the ground side is applied, so the construction is not easy, and the H-section steel at the upper part of the joint is pushed out to the excavation space side by the earth pressure on the ground side, which involves danger in work There was a problem.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a core pile made of upper and lower H-section steels which are buried in each column of an underground continuous wall made of soil cement columns and which are suspended and buried. An object of the present invention is to easily operate a joint with the lower H-section steel from the excavation part side to safely separate the joint on the ground side.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a joining plate contacting both outer surfaces of upper and lower flanges in the same plane of an upper and lower H-section steel having upper and lower end surfaces opposed to each other; A bolt and nut for screwing the joining plate and the upper or lower flange and the joining plate are fixed to a ground-side flange or a female screw hole formed in the joining plate. The upper male thread of the bolt having a head is detachably screwed together, and the upper and lower H-sections can be detachably joined. Reinforcing plates extending over the upper and lower H-sections are disposed on both sides of the web. An apparatus for removing a continuous core pile according to the first invention, wherein the reinforcing plate is erected and welded to both edges of both joint plates in contact with upper and lower outer surfaces of a ground side and an excavation section side flange. The reinforcing plate abuts on the inner surface of the ground side flange, and the reinforcing plate and the ground side And the bonding plate flange and ground mountain side short bolt
The removing device for the continuous wall core pile according to the first aspect of the present invention, which is formed so as to be tightened and fixed with a nut. The reinforcing plate is an L-shaped steel, and the removing device for the continuous wall core pile according to the third aspect of the present invention.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 14 and 15, a plurality of vertical holes are excavated on a relatively soft ground by an earth auger in a straight line, and when the earth auger is raised, cement milk is injected and stirred. The cement column is formed, and the underground continuous wall 10 is formed.

On each pillar, a core pile material in which a plurality of H-section steels 1 and 1 are joined in a vertical direction is hung down at the center and fixed by hardening of soil cement.

The upper and lower H-section steels 1 and 1 abut the upper and lower end surfaces 1 ′ and 1 ′ along the vertical center line, and the upper and lower flanges 2 and 2 have an upright surface on the ground 5 side and a digging portion 6. The upper and lower steps are arranged in the same plane in the side upright surface, and the joining plates 3 and 3 are in contact with both outer surfaces of both flanges 2 and 2.

The upper and lower flanges 2, 2 and the joining plates 3, 3 are inserted into bolt holes 9 drilled at positions corresponding to the flanges 2, 2 and the joining plates 3, 3, and a head 7 is formed at the upper stage by a drilling portion 6. The nut 4 ′ is screwed into the tip of the short bolt 4 on the inner surface of the upper flange 2 and tightened. In the lower flange 2, the head 7 is arranged on the side of the excavation part 6 through the bolt holes 9, 9 drilled in the flanges 2, 2 and the bolt holes 9 drilled in the joining plates 3, 3 corresponding to the holes. Long bolt 4
Is inserted into the flange 2 and the bolt hole 9 of the joint plate 3 on the ground 5 side, and the tip 4 ″ of the long bolt 4 is screwed and fastened to the nut 4 ′ welded and fixed to the ground 5 side of the joint plate 3 and fixed. I do.

[0009] A plurality of H-section steels 1, 1 thus joined together.
As shown above, the core pile material 1a is pressed and propelled into the ground along the center line of each pillar 11 and buried in each pillar 11 as shown in FIG.
4. The column type underground continuous wall 10 shown in FIG. 15 can be formed.

One of the underground continuous walls 10 is the ground 5 and the other is the excavation section 6.
As shown in the figure, buried vehicles 12,1
After the burial of No. 3, it is backfilled with earth and sand (see FIG. 13).

Before the backfilling, the uppermost H-section 1 is pulled and separated from the lower H-section 1 to the ground so that the H-section 1 does not protrude or expose to the ground. At this time, as shown in FIG. 1, the male screw part 4 ″ of the long bolt 4, which contacts the nut 4 ′ with the joining plate 3 on the excavation part 6 side, is bolted to the ground 5 side flange 2 and the ground 5 side joining plate 3. The nut 4 ′ can be screwed (separated) from the nut 4 ′ welded and fixed to the ground 5 side bolt hole 9 of the ground side joining plate 3 through the hole 9. )
As shown in the figure, both flanges 2 and 2 and both joining plates 3 and 3, that is, the lower H-section steel 1 are slid and separated from the excavated portion 6 (pull-out separation).
can do. As shown in FIGS. 5 (a) and 5 (b), the upper and lower H-section steels 1 and 1 can be joined together with long bolts 4 to separate any of the upper and lower long bolts 4 or 4.
The upper H-beam 1 is formed as the long bolt 4 as described above, and the long bolt 4 on the upper H-beam 1 is pulled out from the flanges 2 and 2 and the joint plates 3 and 3 toward the excavated portion 6 and separated. be able to.

By turning the head 4a of the long bolt 4 forward and backward with a wrench or other tool 14 (FIG. 5B), the male screw 4 "at the tip can be detached from the fixing nut 4 '.

Reinforcing plates 7, 7 are disposed on both sides of the web 8 over the upper and lower H-section steels 1, 1, and the reinforcing plates 7, 7 are connected to the joining plates 3 on the ground 5 side and the excavation section 6 side. , 3 'are erected and welded to both edges of the upper and lower H-section steels 1 and 1 to strengthen the joint.
The height of the reinforcing plates 7, 7 is the same as that of the two joining plates 3, 3 or FIG.
Can be shortened as shown in FIG.

Further, as shown in FIG. 9 (b), reinforcing plates 7, 7 made of L-shaped steel are applied to both sides of the web 8 on the inner surface of the ground 2 side flange 5 over the upper and lower H-shaped steels 1, 1. In the lower H-section steel 1, the reinforcing plates 7, 7, the ground 5 side flange 2 and the bonding plate 3 on the ground 5 side are connected with short bolts and nuts 4.
4 ′, and in the upper H-section steel 1, the ground 5 side flange 2 is inserted between the joining plate 3 and the reinforcing plate 7, and FIG.
(A) As shown in FIGS. 10 and 11, the female screw 4 'welded to the outer surface of the joining plate 3 passes through the flange 2 on the ground 5 side and the bolt hole 9 formed in the reinforcing plate 7, and the male screw at the tip of the long bolt 4. 4 ", and the other end of the long bolt 4 is disposed outside the excavated portion 6 side joining plate 3 through the excavated portion 6 side flange 2 and the bolted hole 9 formed in the excavated portion 6 side joining plate 3. The bolt head 4a is engaged.

As shown in FIG. 8, a collar 15 (sheath pipe) is interposed between the ground 5 side flange 2 and the excavation section 6 side flange 2, and the long bolt 4 is inserted through the collar 15. The head 7 of the bolt 4 is screwed to the outer surface of the joint 5 on the ground 5 side, and the male screw part 4 ″ is screwed into the female screw hole 4 ′ or the fixing nut 4 ′ of the joint 3 on the ground 5 side. Thus, the sliding of the long bolt 4 toward the excavation portion 6 can be facilitated.

In the figure, reference numeral 16 denotes the surface of the ground, 17 denotes the backfilled earth and sand in the excavated portion 6, 18 denotes an upset, 19 denotes a cut beam,
In FIG. 6 (c), reference numeral 20 denotes a female screw hole formed in the joining plate 3, into which the male screw portion 4 ″ at the tip of the bolt 4 is screwed, and the nut 4 ′ can be omitted.

[0017]

As described above, the present invention is based on the above-mentioned apparatus, so that it is possible to strongly and easily join upper and lower steps of a plurality of steps of H-section steel propelled down into each column of the column-type underground continuous wall. Not only is it possible to easily operate the joint between the uppermost H-section steel and the lower H-section steel from the excavation part side, and easily and easily separate the buried joint part on the ground side, so that the continuous wall Not only can buried upright H-section steel be easily removed from near the ground,
At the time of the removal operation, the reinforcing plate can sufficiently cope with the shearing force applied to the joining plate due to the earth pressure on the ground side, and there is an effect that the joining plate separating operation of the joining portion can be performed safely.

[Brief description of the drawings]

FIG. 1 is a side view showing a core pile material joined / separated state of the present invention.

FIG. 2 is a side view of a separated state of an uppermost H-section steel and a lower H-section steel.

FIG. 3 is a side view of the uppermost H-section steel in a pulled state.

FIG. 4 is a perspective view of each part of a joint.

FIG. 5 (a) is a side view of a joining state at a joining portion using upper and lower bolts. (B) The figure is a side view of the separated state.

FIG. 6A is a perspective view of a joining plate and a reinforcing plate. (B) The figure is a front view of the upper and lower flanges. (C) The figure is a cutaway plan view with the reinforcing plate provided.

FIG. 7 is a side view of a small-width reinforcing plate extending over upper and lower H-section steels.

FIG. 8 is a plan view showing a state where a collar of a bolt is interposed between flanges.

FIG. 9A is a side view of a state in which a reinforcing plate made of L-shaped steel is mounted. The figure (b) is a plan view of the figure (a).

FIG. 10: Upper stage H between the reinforcing plate made of L-shaped steel and the joining plate
It is a side view of the bolt separation state in a section steel.

FIG. 11 is a side view showing a state where an upper H-section steel is separated from between a reinforcing plate and a joining plate made of L-section steel.

FIG. 12 is a longitudinal sectional view showing a state where an excavation space is formed between continuous walls.

FIG. 13 is a cross-sectional plan view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-section steel 1 'Upper / lower end face 2 Flange 3 Joining plate 4, 4' Bolt / Nut 4 "Tip male screw part 4a Head 5 Ground 6 Excavation part 7 Reinforcement plate 8 Web 20 Female screw hole

Claims (4)

[Claims] 1. A joining plate contacting both outer surfaces of upper and lower flanges in the same plane of an upper and lower H-section steel having upper and lower end surfaces opposed to each other, a bolt and nut for screwing the upper and lower flanges and the joining plate together, The upper or lower flange and the joining plate are fixed to the ground-side flange by a nut or a female screw hole formed in the joining plate. And a reinforcing plate extending over the upper and lower H-section steels is disposed on both sides of the web so that the upper and lower H-section steels can be detachably joined. 2. The removing device for a continuous wall core pile according to claim 1, wherein the reinforcing plate is erected and welded to both edges of both joining plates which are in contact with the upper and lower outer surfaces of the ground side and the excavation portion side flanges. 3. The method according to claim 1, wherein the reinforcing plate is abutted against the inner surface of the ground side flange, and the reinforcing plate is fastened and fixed to the ground side flange and the ground side bonding plate with short bolts and nuts. Removal equipment for core piles. 4. The removal device for a continuous wall core pile according to claim 3, wherein the reinforcing plate is an L-shaped steel.