JPH032419A - Pedestal capable of level control - Google Patents

Abstract

PURPOSE:To make it possible to repair the unflatness of a building easily by fixing the bases of PC steel wires passing through hanging frames to be fitted to the outside of a column to a stand, and joining a cylindrical body to be buried under the foundation with the hanging frames. CONSTITUTION:A floor beam 2 is fixed lengthwise to the base of a steel framed column 1, and a stand 9 is bolted to the base end of the column 1. Hanging frames 6 are fitted to the outside of the column 1, and the bases of PC steel wires passing through the frames 6 are fixed to the stand 9 with nuts 10. The column 1 and the frames 6 are lowered to insert the stand 9 to the inside of a cylindrical body 4 to be buried under the foundation 3, and after the cylindrical body 4 and the frames 6 are fixed to the foundation 3 with anchor bolts 5 and nuts, tension couplers 13 are screwed and loaded to the sleeves 10a of the tops of the steel wires 7. In addition, when the level control of the pedestal is made, the couplers 13 are screwed in so that they are brought into contact with the ends of the frames 6 after the column 1 is lifted together with the stand 9 by a jack to raise the couplers 13 together with the steel wires 7.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a means for correcting the unevenness of unevenly settled buildings, and is particularly effective for foundation-type buildings that are prone to large settlements.
This invention relates to level-adjustable column bases that can correct unevenness caused by uneven settlement of buildings.

(Prior Art) Conventionally, when building a building on soft ground such as a reclaimed land, piles have been driven to support the foundation.

When using such support piles, it is necessary to consider negative friction, and when the support layer is deep, the proportion of the pile work in the construction cost increases, and for buildings with piles, due to surrounding ground subsidence, It became necessary to adjust the level of the building and surrounding ground.

Therefore, when constructing a building on soft ground, an alternative construction method is a foundation construction method (floating) that balances the weight of the building and the weight of soil removed.

This construction method reduces costs because there are no piles, but uneven settlement of the ground tends to cause unevenness in the surrounding ground and buildings.

In such cases, the building's foundation beams and base are made to have sufficient rigidity to counteract ground subsidence, but if the building becomes too large to follow, it becomes impossible to keep up with the subsidence, and it is necessary to correct the subsidence.

Conventionally, there is a method of jacking up the steel column as an adjustment method. This is done by installing a guide shaft (anchor bolt or column) on the foundation in advance to guide the steel column vertically.
In response to uneven settlement, the pillars were jacked up using this as an axis, and mortar was filled underneath. The horizontal force was supported by the guide shaft.

(Problem to be Solved by the Invention) However, in such a device that resists horizontal force using a guide shaft and fills with mortar after jacking up, it takes time and effort to fill the mortar and harden it, and it is difficult to install it on site. In the case of jacking up a building, expensive equipment such as welding a bracket to a steel column was required, which resulted in high construction costs and a long construction period.

The present invention was made in view of the above circumstances, and its purpose is to take full advantage of the advantage of the floating construction method, which is the reduction in construction costs, and to easily repair the unevenness of buildings that have sunk unevenly at low cost and in a short period of time. It is possible to provide level-adjustable column bases.

(Means for Solving the Problems) In order to achieve the above object, the column base of the present invention consists of a cylindrical body embedded and fixed in the foundation through anchor bolts, and a base end of the column placed on a pedestal. One end of the prestressing steel material, etc. is erected and fixed at its outer end, and the frame is fitted into the cylindrical body so as to be movable up and down. A hanging frame is fixed to the anchor bolt by penetrating it upward, and a sleeve at the other end of the PC steel material, etc., which is erected at the outer end of the mount and passes through the hanging frame, is screwed and locked to the hanging frame. The other end of the sleeve can be pulled by a center hole jack or the like.

(Function) When adjusting the level of the column base according to the present invention, a jack is installed on the hanging frame, and when the sleeve is pulled by this jack, the reaction force is transmitted from the hanging frame to the foundation through the cylinder, and the building is damaged. Lift up. At this time, the pedestal provided at the base end of the column slides upward inside the cylindrical body embedded in the foundation. Therefore, the sleeve at the other end (upper side) of the PC steel material etc. rises while being pulled upward within the hanging frame by a jack. Next, tighten the nut that locks the upper end of the PC steel material, etc. to the hanging frame so that it engages with the hanging frame, and then remove the jack.

The suspension frame is fitted externally to the base of the column, and together with the pedestal fitted into the cylinder in the foundation, the suspension frame and PC steel materials support the pedestal while resisting horizontal forces. Stops receiving the load.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 shows a plan view, and floor beams 2 are fixed vertically and horizontally to the base of a cylindrical steel column 1, and below them are anchor bolts 5 that fix a cylinder 4 embedded in a foundation 3. It is suspended and supported by a fixed hanging frame 6 using PC steel material 7 or the like. The structural details are shown in FIG. 2 from the direction of the arrows ``--'' in FIG. 1 and will be explained.

A bottomed cylindrical body 4 is buried in the foundation 3, and a horizontal collar 8 is formed on its upper edge, and the anchor bolt 5 projects upward from the foundation 3 through this collar 8. A hanging frame 6 is fixedly connected at the top.

A frame 9 that fits into the cylinder 4 is bolted to the base end of the steel column 1. The frame 9 is larger than the diameter of the steel column 1, and has a size such that its outer end protrudes horizontally toward the outer periphery of the steel column 1. Naturally, this pedestal 9 has a diameter large enough to be slidable in the vertical direction.

A sleeve 10 at the lower end, through which a PC steel material 7 is passed vertically, is fixed to the bottom of the pedestal 9 with a nut. The lower part of the PC steel material 7 is attached to the pedestal 9 and the sleeve 10
The top of the suspension frame 6 is fixed in place vertically and extends straight upwards, while the upper part of the suspension frame 6 is ring-shaped, and this ring-shaped part is attached to the steel column 1. The top of the PC steel material 7 penetrates the suspension frame 6 and projects upward while being lowered together with the steel column 1 while being fitted, and when the steel column 1 and the suspension frame 6 are lowered downward, the frame 9
is fitted into the cylindrical body 4. In addition, the lower part of the hanging frame 6 has a cylindrical shape with the same inner diameter as the inner diameter of the cylinder body 4, and the lower end part spreads horizontally toward the outer circumference to form a flange 12 to which a rib 11 is welded. Pass the top of the anchor bolt 5 through the flange 12 so as to align it with the collar 8 on the upper edge of the cylinder 4 on the side of the foundation 3. Then, screw the nut into the top of the anchor bolt 5 to remove the cylinder. 4 and a hanging frame 6 are integrally and firmly fixed to the foundation 3 with anchor bolts 5.

Thereafter, the tension coupler 13 is screwed onto the sleeve 10a at the top of the PC steel material 7. As shown in FIG. 2, the cylinder body 4 and the hanging frame 6 constitute a guide cylinder in which the pedestal 9 is vertically slidable. In other words, a piston called a pedestal 9 is fixed to a piston rod called a steel column 1 inside a cylinder composed of a cylinder body 4 and a hanging frame 6, and when adjusting the level of the column base, the hanging frame 6 is fixed. A center hole jack 14 is interposed on the upper end surface, and when the jack 14 lifts up the PC steel material 7, the steel column 1 rises integrally with the frame 9, and accordingly, the PCY4 material 7 material 7 It protrudes and rises above the upper end surface of the frame 6.

Then, the tension coupler 13 rises vertically together with the PC steel material 7, so the tension coupler 13 can be screwed into contact with the upper end of the hanging frame 6, and then the jack 14 can be removed.

A frame 15 is naturally interposed between the center hole jack 14 and the upper end surface of the hanging frame 6.

Therefore, it is sufficient to use the jack 14 to lift up the floor to an appropriate height so that the floor surface becomes horizontal. When lowering the floor surface downwards, the tension coupler 13 can be turned in the loosening direction.

(Effects) As explained in detail above, the level-adjustable column base of the present invention has the same horizontal resisting force regardless of the level of the column base via the fixed anchor bolt.

A hanging frame that is fitted externally to a pillar and fixed to an anchor bolt through a PCFV4 material, etc., and the top of a PC steel material, etc., which is erected at the outer end of the frame and penetrated through this hanging frame, is screwed into the hanging frame. Since it is equipped with a nut that engages and locks, the part of the hanging frame that contacts the column holds down the outer periphery of the column against the horizontal force that the base of the column receives, and the hanging frame applies a reliable horizontal counterforce to the anchor bolt. Communicating. When adjusting the level, once the building has been jacked up using a jack, the jacking up work is completed by tightening the nut in the direction of the hanging rod.Since it does not involve filling with mortar, etc., it can be used to prevent uneven settlement on soft ground. The level adjustment work can be completed easily and quickly. Furthermore, since the column base is suspended by a hanging frame, by combining it with a horizontal force processing mechanism, it can be used as a general suspension structure for column bases on the ground, and also for special construction methods such as seismic isolation. It is.

In other words, if the dimensions of the frame are configured to allow some movement of the column in the lateral direction relative to the cylindrical body, and if the foundation and the building are connected with seismic isolation bearings or dampers that can resist horizontal forces, the damper It is possible to obtain a seismic isolation structure that does not require the vertical load of the building to be directly borne by the seismic isolation bearings.

Furthermore, since it is suspended using PC steel, etc., most of the work is done at the floor level using center hole jacks, etc., and there is no need to work under the floor.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a column base according to the present invention when viewed from above, and FIG. 2 is a cross-sectional view taken from the direction of the arrow ``--'' in FIG. 2... Floor Beam 4... Tube Body 6... Hanging frame 8... Tsuba 10... Sleeve 12... Flange coupler 15...・Frame... Steel column 3... Foundation 5... Anchor bolt 7... PC steel wire 9... Frame 11...・Rib 13...Tension 14...Jack

Claims (1)

[Claims] A cylindrical body embedded and fixed in the foundation through anchor bolts,
The base end of the column is placed on the pedestal so that both of them are integrated, and one end of a PC steel material is erected and fixed on the outer end of the pedestal. At the same time, the PC
A hanging frame is fixed to the anchor bolt by passing the other end of the steel material vertically upward, and a sleeve at the other end of the PC steel material, etc., which is erected at the outer end of the frame and passes through the hanging frame, is suspended. A level-adjustable column base that is equipped with a nut that is screwed into the frame and that allows the other end of the sleeve to be pulled with a center hole jack or the like.