JPH0469270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of lifting a heavy structure, which has sunk together with a foundation pile due to ground subsidence, by using a jack or the like.

(Prior art) When constructing a heavy structure, the structure is usually constructed by driving a large number of foundation piles into the ground until the tips reach a supporting layer such as bedrock, and then setting a foundation on top of the piles. However, if these foundation piles do not reach the support layer sufficiently, the structure will sink together with the foundation piles due to ground subsidence and continue to descend until the tip of the foundation pile is stable on the support layer. The structure may sink completely, or may settle unevenly and tilt to one side.

In order to restore a structure in such a state to its original state, as shown in Figure 3, excavate the area corresponding to the lower surface of the foundation of the structure 9 to expose the upper part of the foundation pile 8. , remove the upper end of one of the adjacent piles, and push up the structure 9 by inserting a jack 10' between the removed upper surface of the foundation pile or the upper surface of a temporary foundation instead of this and the lower surface of the foundation of the structure. , After achieving the required height, surround the lower part of this foundation with formwork,
Concrete is poured there to fix the whole structure, but in this case, in order to evenly push up the structure, a large number of jacks 10' are operated at the same time, and the structure is pushed up at the same time as the hydraulic cylinder is pushed up. It is necessary to push in appropriate pillow material little by little to prevent it from descending.

However, if the area of the excised upper surface of the foundation pile on which the jack is mounted is small, there is no room for inserting the pillow material, and for this reason, the jack 10' has a threaded section above the hydraulic cylinder 7', as shown in Fig. 4. 1' is generally used, and each time the structure is pushed up little by little via a hydraulic cylinder 7', the screw of the threaded part 1' is rotated to hold the structure from falling. . Once the required height has been reached, the piping from the hydraulic pump connected to each jack is removed, and the lower part of the foundation is surrounded with formwork, filled with concrete, and the entire jack is assembled into one piece. become

(Problems to be Solved by the Invention) However, since the jack 10' used in the above method is mounted on the upper surface of the foundation pile in a narrow space, it is extended upwardly as shown in FIG. Since the height is more than twice the actual height due to the screw part 1' and the screw part 1', the lower surface of the structure should be passed between the foundation piles and excavated to a height where this jack can be used, as shown in Figure 3 above. This is a very time-consuming task, and since there is no excavation cost, the construction costs are high. The jack 10' itself is a one-piece product that cannot be disassembled and weighs 180 to 360 kg, but must be carried by hand, making it extremely difficult to work with the excavation described above. Furthermore, when pouring concrete after the lifting, it is not possible to remove the jacks, so all the jacks are buried in the concrete, which is extremely uneconomical.

(Means for solving the problem) In contrast, the present invention makes the hydraulic cylinder part and the threaded part separate, and if the threaded part is formed into a pedestal surrounding the hydraulic cylinder part, the height of the hydraulic cylinder part can be increased. We focused on the fact that only this pedestal needs to be buried when pouring concrete, and the threaded part of this pedestal can be used to easily hold the structure pushed up by a hydraulic cylinder. It was completed with the focus on the fact that the screw structure could be extremely simple since it only serves to support it so that it does not fall.

(Embodiment of the Invention) FIG. 1 shows a lifting support device 1 used in carrying out the present invention. As is clear from FIG. 1, the entire device has straight pipes 3 erected at each corner of the upper surface of a rectangular lower base plate 2, and screw rods 5 hanging from each corner of the lower surface of a rectangular upper base plate 4. and screw the nuts 6 onto these screw rods 5, respectively, to tighten each screw rod 5.
is formed by inserting it into the straight pipe 3, and by setting each nut 6 at a constant height, the upper and lower base plates 4, 2
The interval between the two can be set to a predetermined height. The upper and lower base plates 4 and 2 are large enough to be stably mounted on the top surface of the foundation pile whose upper end has been cut off, and the intervals between the straight pipes 3 are such that the hydraulic cylinder 7 can be freely inserted and removed. It's summery. Note that when using the device of the present invention, the upper surface of a temporary foundation can also be used as the upper surface of the foundation with its upper end cut off. Of course, this lifting support device may also be used in an upside down state.

Below, the sequence of hoisting and supporting a heavy structure using the apparatus of the present invention will be explained. First, the lower surface of the foundation of the structure is excavated in the same way as in the conventional method, but after excavation, the depth is determined from the upper surface of the foundation pile (or the upper surface of the temporary foundation) with the upper end cut off to the structure. It is sufficient that the height reaching the lower surface of the hydraulic cylinder 7 is a height that allows the lifting support device 1 to be inserted, that is, it may be slightly higher than the height of the hydraulic cylinder 7 when it is shortened. In this way, the lifting support device 1 is positioned between the top surface of the excised foundation pile 8 and the lower surface of the foundation of the structure 9, and the hydraulic cylinder 7 is housed between the base plates 4 and 2.
(Fig. 2A) The hydraulic cylinder 7 is operated via a separately provided hydraulic pump mechanism to push up the foundation of the structure 9 together with the upper base plate 4. In this state, the nut 6 is rotated to remove each straight pipe 3. Press it against the rim of the mouth. (FIG. 2B) The piston of the hydraulic cylinder 7 is lowered and taken out from the lifting support device 1. (Fig. 2C) In this way, the hydraulic cylinder 7 is recovered, and then concrete is poured to integrate the entire structure and the work is completed.

(Effects) As explained above, the present invention provides the lifting support device 1.
Since the work is started with the hydraulic cylinder 7 housed inside, the excavation depth can be approximately half of the conventional depth as described above, and the hoisting support device 1 prevents the elevated structure from descending. For example, screw reinforcing bar can be used as screw rod 5, or straight pipe 3 can be used as screw rod 5.
It can be lifted and supported using a simple iron pipe, and the lightweight upper and lower base plates 4 and 2 can be carried separately, making the work easy. Since columns are placed at each corner of the board and the lower baseplate, it is easy to insert and remove the hydraulic jack between the upper and lower baseplates, and each column is lightweight, and furthermore, concrete can flow easily into heavy structures. There are many advantages in that the support of is also achieved very satisfactorily.

[Brief explanation of the drawing]

1 and 2 show the device of the present invention in use, FIG. 1 is a perspective view of the lifting support device, FIGS. 2A to 2C are front views showing the lifting state, and FIG. A general explanatory diagram shows the state in which the lower part of the structure has been excavated during hoisting work, and FIG. 4 is a front view of a conventionally used jack. 1... Lifting support device, 2... Lower base plate, 3...
Straight pipe, 4...Top plate, 5...Screw rod, 6...Nut, 7...Hydraulic cylinder, 8...Foundation pile, 9...
Structure.

Claims (1)

[Claims] 1 Consists of a rectangular upper and lower base plate, and four telescoping pillars made by inserting a spiral pipe into a straight pipe and screwing a nut into the protruding part, and attaching the pillars to each corner between the upper and lower base plates. A heavy structure hoisting support device characterized in that a hydraulic jack is arranged between the upper and lower base plates so that it can be inserted and taken out.