JPH0742713B2 - Support structure for structures for soft ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a support structure for a structure constructed on soft ground such as a landfill on the coast.

<Prior art> When constructing a structure on soft ground, conventionally, a support pile is driven into the support layer of the support ground, a foundation is constructed and supported on the support pile, and the structure is constructed on the foundation. Was there.

<Problems to be solved by the invention> However, when subsidence occurs in soft ground, a downward frictional force (negative friction) works, thereby causing the support pile to be melded, and the support pile also causes a large subsidence. This causes differential settlement of the upper structures.

Since differential settlement has harmful effects such as stress concentration in the upper structure, it is necessary to take measures against differential settlement.

Therefore, various measures such as incorporating a jack-up mechanism under the pillars and increasing the rigidity of the building have been considered as measures against this differential settlement, but all of them are economical, easy to install, and perform maintenance afterwards. There was a problem with that, and there was an urgent need to establish alternative construction methods.

The present invention has been made in view of such circumstances, and stably supports a structure constructed on soft ground in a predetermined position regardless of the settlement of the support pile due to negative friction. The purpose is to be able to.

<Means for Solving Problems> The support structure for a structure for soft ground of the present invention has a structure in which a support member is erected on a foundation supported by a support pile and the support thereof is provided in order to achieve such an object. While suspending and supporting the structure through the suspension member to the member, the suspension member,
A suspension position adjusting mechanism for adjusting the suspension position of the structure with respect to the support member is additionally provided.

<Operation> According to the above configuration, the support pile is brought into a state of being absorbed by the frictional force due to the subsidence of the support ground, and when the foundation is subsided due to that, the suspension position adjusting mechanism causes
It is possible to raise the structure with respect to the support member by an amount corresponding to the amount of subsidence of the foundation, and to correct the structure so that it is in a predetermined position with respect to the ground.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

<First Embodiment> FIG. 1 is a schematic overall vertical cross-sectional view of the first embodiment, in which support piles 1, 1 ... Are driven into the support layer of the support ground G, and the support piles 1, 1 ... Foundation 2 is constructed and supported, and Foundation 2
A gate-shaped support frame 3 as a support member is erected and supported on the upper side at a predetermined interval in the horizontal direction.

The bottom 4a of the structure 4 constructed on the soft ground and the support frame 3
A pair of steel rods 5 as suspending members in a state in which the structure 4 is prevented from descending across the respective lateral frame portions 3a.
Are connected to each other, and the structure 4 is suspended and supported by the support frame 3 via the steel rods 5 respectively.

A length adjusting mechanism 6 as a suspending position adjusting mechanism is interposed between the pair of steel rods 5 and 5 in the longitudinal direction, and even if the foundation 2 sinks due to ground subsidence, The height of the structure 4 is raised with respect to the support frame 3 by shortening the height adjusting mechanism 6 and adjusting the hanging position.
It is configured to correct the position of the ground plane with respect to the ground surface and maintain it at a proper position.

As shown in the partially cutaway enlarged view of the main part of FIG. 2, the length adjusting mechanism 6 has a steel rod 5 whose upper end is attached to the support frame 3.
And a threaded portion 7 is formed on the other end side of each steel rod 5 whose lower end side is attached to the structure 4, and the threaded portions 7, 7 respectively
A nut 9 integrally connected to the annular member 8 by welding is screwed into the annular member 8. With this turnbuckle type structure, both steel rods 5, 5 are displaced toward each other by the rotating operation of the annular member 8, and the structure 4 is moved. It is configured so that it can be raised with respect to the support frame 3.

The length adjusting mechanism 6 may be provided at a plurality of positions in the vertical direction so that a large amount of adjustment of the length can be obtained. Further, one steel rod 5 is provided with a drive mechanism such as an electric motor, The drive mechanism and the annular member 8 may be interlocked and connected so that the annular member can be driven and rotated.

<Second Embodiment> FIG. 3 is a schematic overall vertical cross-sectional view of the second embodiment, which is supported on a base 2 constructed in the same manner as the first embodiment, at a predetermined horizontal interval. The support pillars 10 as members are erected and supported, and at the upper ends of the support pillars 10 ...
A moving pulley 12 around which a suspending wire 11 as a suspending member is wound is rotatably mounted.

Support columns 10 ... A winch 13 as a suspension position adjusting mechanism is installed on the foundation 2 corresponding to each, and a suspending wire 11 extended from the winch 13 is a movable pulley 12.
And the tip of the suspending wire 11 is connected to the bottom portion 4a of the structure 4, and even if the foundation 2 sinks due to ground subsidence, the suspending wire 11 is wound by a predetermined amount. By adjusting the hanging position to raise the structure 4 with respect to the support columns 10 ..., the position of the structure 4 with respect to the ground surface is corrected, and the structure 4 can be maintained at an appropriate position. Has been done.

According to the second embodiment, since there is nothing that blocks the upper side of the structure 4, there is an advantage that it can be easily applied to the tall structure 4.

<Effect of the Invention> According to the present invention, the structure is suspended on the support member, and by adjusting the suspension position, regardless of the subsidence of the support pile, it is possible to correct the position for the subsidence. The structure can be stably supported with it maintained at a predetermined position, the subsidence of the structure can be prevented from progressing, and it is possible to prevent the structure from being unexpectedly damaged by receiving a large local stress, and to soft ground. On the other hand, the structure can be constructed well.

Moreover, in addition to adopting the suspension structure and adjusting the position of suspension to correct the subsidence, these components can be installed outside the structure, and a jack-up mechanism is installed below the structure. compared to,
The construction has become simpler, the economy and workability have been improved, and the maintenance has become easier.

[Brief description of drawings]

The drawings show an embodiment of a support structure for a structure for soft ground according to the present invention. FIG. 1 is a schematic overall vertical cross-sectional view of the first embodiment, and FIG. 2 is an essential part of FIG. FIG. 3 is an enlarged partial cutaway view, and FIG. 3 is a schematic overall vertical sectional view of the second embodiment. 1 ... Support pile 2 ... Foundation 3 ... Support frame as support member 4 ... Structure 5 ... Steel rod as suspension member 6 ... Length adjustment mechanism as suspension position adjustment mechanism 10 ... … Supporting pillars as supporting members 11 …… Suspending wires as suspending members 13 …… Winches as suspending position adjusting mechanism

Claims (1)

[Claims] 1. A support member is erected on a foundation supported by a support pile, and a structure is suspended and supported on the support member via a suspending member. A support structure for a structure for soft ground, further comprising a hanging position adjusting mechanism for adjusting a hanging position of the structure.