JPS6319334A - Waling work in sheathing construction - Google Patents

Abstract

PURPOSE:To reduce the bending moment and shearing force of waling by side pressure by applying a reverse reaction by jacks to the central part of waling by using PS steel wire as a reaction which is set on the inside of the waling. CONSTITUTION:Both ends of a PS steel wire 6 are thrust through a receiver 7 and tensely laid on the inside of a waling 2 whose central inside is attached with a base metal 10 having a jack 12 set outwards with a receiving metal 11. The central part of the wire 6 connected to the head of the jack 12 is tensed by the extending operation of the jack 12 in such a way as to permit a reverse reaction to apply to the central part of the waling 2 as a reaction. The reverse reaction to be applied to the waling 2 is selectively set up according to the magnitude of side pressures by earth pressure and water pressure acting on the sheathing wall 1. Shore struts can thus be omitted by widening the supporting span of the waling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for raising the ground in a heaping method used for the purpose of preventing the surrounding ground from collapsing during underground construction.

[Conventional technology]

Currently, there are two types of mountain stop construction methods that are widely used: the horizontal cut method and the PSS Sanno method. Of these, prestressing is introduced into the PSS Sanno construction method using PS steel materials or steel rods,
The support span of the abdominal stand has been widened and the cut beam has been omitted.

[Means for solving problems]

An object of the present invention is to provide a new method for raising the abdomen that can reduce the influence of lateral pressure on the abdomen by simple means, widening the support span of the abdomen and eliminating the need for a cut.

This invention for the above-mentioned purpose is a mountain stop construction method in which a raised wall is provided with a cross member on the inside of a retaining wall, and the corner is reinforced with flint, in which a PS steel wire is stretched inside the raised wall, and
The gist is to provide a jack that tensions the PS steel wire in the horizontal direction in the center of the abdominal lift, and to use the PS steel wire as a reaction force to apply a reverse reaction force to the abdominal lift, thereby reducing the lateral pressure on the abdominal lift. It is something.

〔Example〕

In the figure, 1 is a retaining wall, 2 is a support provided on the inside of the retaining wall 1, and 3 is a flint by a supplementary member installed diagonally horizontally in the corner of the retaining wall 1.

The above-mentioned flint 2 and flint 3 are connected via fixing metal fittings 4 provided at the connecting portions on both sides of the cuffing 2, and the fixing metal fittings 4 are
A receiving member 7 for the PSgI wire 6 is attached within the wall plate 5 on the ventral side.

This receiving member 7 is formed by forming a semicircular half 73 of a metal fitting 72 having an insertion hole 71 in the center.
is housed inside the base metal fitting 8 integrated with the fixing metal fitting 4 with the half part 73 facing outward, and the half part 73 faces the vertical groove 9 of the wall part 5 so as to be freely rotatable in the horizontal direction. It is set in.

Both ends of the PS steel wire 6 are inserted through the receiving member 7 and stretched inside the rib cage 2 . Further, a base metal fitting 10 is attached to the inside of the central portion of the breech 2, and a jack 12 such as a journal jack or a hydraulic jack is attached to the base metal fitting 10, together with a receiving metal fitting 11, facing outward.

The central part of the PS steel wire 6 is not hung on the head 12a of the jack 120, and the extension of the jack 12 tensions the PS steel wire 6 like a string, and acts as a reaction force, causing abdominal tension. A reverse reaction force is applied to the center of 3.

The reverse reaction force generated by the PS steel wire 6 and jack 12 can be arbitrarily set according to the magnitude of lateral pressure due to earth pressure, water pressure, etc. acting on the retaining wall 1, and thereby The bending moment and shear force of 2 are reduced,
The support span of the abdominal stand 2 can be expanded.

Figure 4 is an explanatory diagram of the bending moment. Assuming that the bending moment due to the design side pressure is +M1, the bending moment knee due to the center jack reaction force M2, and the eccentric bending moment knee due to the tension of the PS steel wire M3, the resultant moment is MΦ =M - (M2+M3) M end = M3, and the bending moment applied to the breech 2 becomes small.

〔Effect of the invention〕

As described above, this invention uses the PS steel wire stretched inside the ventricle as a reaction force to apply a reverse reaction force to the central part of the ventricle using jacks, thereby reducing the bending moment and shearing force of the ventricle due to lateral pressure. Because of this, it is possible to widen the support span of the ventricle and omit the cutting burr, thereby reducing the cost of locking and root cutting. In addition, the support span of the uprise can be designed according to the level of lateral pressure and the planar scale of the excavated ground, and a large internal space can be secured, which improves the efficiency of underground construction.

[Brief explanation of the drawing]

The drawing shows one of the methods for raising the belly in the Sanno construction method according to this invention.
Fig. 1 is a schematic plan view of the thread stopper, Fig. 2 is a partially cross-sectional plan view of the PS steel wire binding part, Fig. 3 is a partially cross-sectional plan view of the jacking part, and Fig. 3 is a partially cross-sectional plan view of the jacking part. FIG. 4 is an explanatory diagram of each bending moment. 1... mountain stop wall, 2... belly rise,
3... Flint, 4... Fixing hardware, 6... PSSiM wire, 7... PSS ridge line receiving member, 12... Jacket . Patent applicant: Shimizu Corporation 5/)] Name Figure 4 - Earthen\;

Claims (1)

[Scope of Claims] In a mountain stop construction method in which a raised wall is provided with a horizontal member on the inside of the mountain stop wall and the corner is reinforced with flint, PS is installed inside the raised wall.
At the same time as the steel wire is stretched, a jack is installed in the center of the abdominal extension to tension the PS steel wire in the horizontal direction, and the jack applies a reverse reaction force to the abdominal extension using the PS steel wire as a reaction force, thereby creating lateral pressure on the abdominal extension. This method is characterized by reducing the amount of damage.