JP3281870B2 - Method and apparatus for measuring lateral pressure applied to earth retaining support frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring a lateral pressure applied to an earth retaining and supporting structure which is installed to prevent collapse of a ground during excavation work.

[0002]

2. Description of the Related Art In order to prevent the ground from collapsing due to destruction of the earth retaining support frame when the lateral pressure transmitted to the earth retaining support frame exceeds the proof stress of the earth retaining support frame, the earth pressure is transmitted to the earth retaining support frame. Conventional methods for measuring lateral pressure for constantly monitoring and managing lateral pressure are as follows: (1) Measure the stress change of the retaining wall by a measuring instrument attached to the retaining wall, and convert the stress change of the retaining wall into the lateral pressure. A method and (2) a method of measuring the axial force of the girder using an axial force meter attached to the girder and converting the axial force of the girder into a lateral pressure are used.

[0003]

In the measuring method (1) described above, the measuring instrument is buried in the soil in the initial stage of constructing the retaining wall, so that the measuring method cannot be performed depending on the installation condition. There is a drawback, and the measurement is a method that captures only the stress deformation of a part of the component of the retaining wall to which the measuring device is attached, so it is not possible to accurately capture the actual lateral pressure, and It is a measurement and it is not possible to measure the lateral pressure on the entire retaining structure. Furthermore, there is a problem that a large number of measurement points cannot be provided due to the complexity of the construction method and the cost.

In the measurement method (2) described above, the installation place of the axial dynamometer is at the crossing point of the girder, and the eccentric load is applied, so that accurate lateral pressure cannot be measured. There is a drawback that it is difficult.Besides, the cutting beam is erected in the vertical and horizontal directions, and the crossing part is tightened by metal fittings to form a united state. Therefore, the value displayed by the axial dynamometer is a value limited to the installation location, and is not an actual lateral pressure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for measuring a lateral pressure applied to an earth retaining shoring capable of accurately measuring the actual lateral pressure on the entire earth retaining shoring directly applied to the earth retaining wall. Is to do.

[0006]

According to the present invention, there is provided a measuring method applied to an earth retaining support frame, in which a strain member is interposed between an earth retaining wall of the earth retaining support frame and a bulge connected to a cutting beam. ,
The strain deformation of the strain member is measured by a strain gauge.

The apparatus for measuring lateral pressure applied to an earth retaining support frame according to the present invention mounts a back-filling device between an earth retaining wall of the earth retaining support frame and a bulge connected to a cutting beam, and backfills. The instrument is provided with a strain member adjacent to the retaining wall, and the strain member is provided with a strain gauge for measuring stress deformation.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for measuring a lateral pressure applied to a retaining structure according to the present invention.

An earth retaining support structure for supporting lateral pressure generated during the progress of excavation work is composed of an earth retaining wall 1, an uplift 2, and a cutting beam 3, and is provided between the earth retaining wall 1 and the uplift 2. The backfill device 4 is mounted in the gap.

The back-filling device 4 includes a box-shaped member 5 and a strain member 6.
The box-shaped member 5 is connected to the cutting beam 3 of the earth retaining support frame and is connected to the bulge 2, and the strain member 6.
A rectangular container for the filler A having a rear plate 8 connected to the side plates 9, both side plates 9, 9 and a bottom plate 10;
At the upper end of 9 is an engaging hook 1 to be engaged with the upper end of the belly 2
The rear plate 8 is provided with a notch groove 12 for connecting the strain member 6.

The strain member 6 is made of a metal material having an H-shaped cross section disposed perpendicularly to the retaining wall 1 subjected to stress deformation due to lateral pressure from the retaining wall 1, and a pressing plate 13 pressed against the retaining wall 1. A sliding plate 14 disposed in the box-shaped member 5. The sliding plate 14 can be slid into the box-shaped member 5 by inserting the strain member 6 into a notch groove 12 formed in the box-shaped member 5. Is positioned. A strain gauge 15 for measuring stress deformation is attached to the strain member 6, and the strain gauge 15 is connected via a cord 16 to a data logger device provided outside the earth retaining support frame. The information from the gauge 15 is collected, and the information is calculated and printed.

Engagement hooks 11 and 11 are engaged with the belly 2 connected to the cutting beam 3 of the earth retaining support frame, and the backfilling device 4 is provided.
The sliding plate 14 of the strain member 6 and the entire plate 7 of the box-shaped member 5 are installed in the gap between the wall 2 and the retaining wall 1 and are disposed in the box-shaped member 5 of the backfilling device 4. By inserting a filler A such as sand, earth, etc., the strain member 6 is slid so that the pressing plate 13 of the strain member 6 is pressed against the earth retaining wall 1, and the side pressure generated as the excavation work progresses. The bulge is transmitted from the retaining wall 1 through the strain member 6 of the filling device 4 to the retaining wall 2 and the cutting beam 3, so that the lateral pressure is supported by the entire retaining retaining frame, and all of the lateral pressure applied to the retaining wall 1 is reduced. It is directly absorbed by the strain member 6 arranged adjacent to the retaining wall 1 and perpendicular to the retaining wall 1, the strain member 6 undergoes stress deformation due to lateral pressure, and the stress deformation is measured by a strain gauge 15, and each strain is measured. The measured values from the gauge 15 are collected in a data logger device, calculated and marked. Record, and and manages monitoring lateral pressure loaded on the earth retaining 支保 rack 構全 body.

[0013]

According to the present invention, a strain member is attached between a retaining wall of a retaining retaining frame and a bulge connected to a cutting beam, and a lateral pressure applied to the retaining wall is reduced by a strain applied to the retaining wall adjacent to the retaining wall. Since the member can be directly absorbed, by measuring the stress deformation of the strain member, it is possible to accurately measure the lateral pressure with respect to the entire retaining structure.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus that implements a method of measuring a lateral pressure applied to an earth retaining support frame according to the present invention.

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Earth retaining wall 2 Upset 3 Cut beam 4 Back-filling device 5 Box-shaped member 6 Strain member 7 Front plate 8 Rear plate 9 Side plate 10 Bottom plate 11 Engagement hook 12 Notch groove 13 Press plate 14 Sliding plate 15 Strain gauge 16 codes

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-178517 (JP, A) JP-A-8-260464 (JP, A) JP-A-56-153214 (JP, A) 62649 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 17/04 E02D 17/08 G01L 5/00 G01B 7/16

Claims (2)

(57) [Claims] The present invention is characterized in that a strain member is interposed between a retaining wall of a retaining retaining frame and a bulge, and the stress deformation of the distortion member is measured by a strain gauge. Method of measuring lateral pressure. 2. A backfilling device is mounted between a retaining wall of a retaining retaining frame and a bulge, and the backfilling device is provided with a strain member adjacent to the retaining wall. An apparatus for measuring lateral pressure applied to an earth retaining support frame, comprising a strain gauge for measuring deformation.