JP2000054384A - Detent device for strut support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detent device for a strut support, by which the reduction of the binding power of the strut support is prevented while the slipping-off of the strut support can be obviated even when vibrations are applied to a coupling device for the strut support. SOLUTION: In a coupling device, which is installed to the strut support 20 in a cut and cover tunneling method, etc., and in which a connector with a retaining section and a rotary metal fitting 23 is inserted to a fixture for an earth retaining panel 41, the retaining section is brought into press-contact with the fixture by turning the rotary metal fitting 23 and the strut support 20 is coupled with the earth retaining panel 41, a detent tool 63 is mounted movably on the rotary metal fitting 23. When the strut support 20 is connected to the earth retaining panel 41 at that time, the detent tool 63 is moved, and the rotary metal fitting 23 is fixed to the earth retaining panel 41 under the state of a detent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for connecting a retaining panel with a girder support in an open-cutting method or the like, and more particularly, to a retaining panel even when vibrations are applied to the retaining panel and the girder support. And a detent device for the girder support for securely holding the connection of the girder support.

[0002]

2. Description of the Related Art In an open-cutting method or the like, as shown in FIG. 16, two earth retaining panels 1 connected at a predetermined interval by a cutting beam support 2 provided with a connecting member 4 having a rotating bracket, for example, a cotter 3. Is installed at the excavation site. That is, a T-shaped connecting member 4 is attached to the cutting beam support 1 by bulging the locking portion 5, and the connecting member 4 is attached to the retaining panel 1.
After being inserted into the hole of the mounting bracket and rotated by about 90 degrees to be connected in a retaining state, the cotter 3 (wedge), which is also used as a rotating bracket, is driven into the cutting beam support 2 to firmly join the two. I have.

However, since the cotter 3 is gradually loosened due to vibration during construction, there is a problem that the coupling force between the retaining panel 1 and the girder support 2 becomes gradually weaker.
In order to solve this, check the looseness of the cotter 3 periodically during construction, and if it is loosened,
I was typing. Therefore, this check was troublesome.

[0004] Furthermore, when this loosening progresses,
There has also been a problem that the connecting tool 4 is displaced and the cutting beam support 2 comes off.

[0005] In Japanese Patent Application No. 10-141698, the applicant has developed a connecting device for a girder support without using a wedge (cotter). In this connecting device, the connecting member of the girder support is inserted into the hole of the mounting device of the earth retaining panel, and is rotated by about 30 degrees, whereby the locking portion is temporarily fixed. After the both ends of the girder support have been temporarily fastened to the retaining panel, turning the connector about 60 degrees further ensures that the girder support is securely fixed to the retaining panel.

[0006]

In the above-described connecting device for a girder support, since the end of the girder support can be temporarily fixed and the position of the other end does not deviate even if it is temporarily fixed, both ends of the girder support are temporarily fixed. Since it can be connected in the stopped state, there are advantages such as extremely easy assembling. Therefore, many advantages are exhibited in the construction work for assembling heavy parts such as a digging method. However, it has not been enough to prevent the girder support from being displaced or coming off when vibration is applied to the retaining panel and the girder support.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the coupling force of a girder support from decreasing even when vibration is applied to a connecting device for the girder support. Another object of the present invention is to provide a detent device for a girder support that can prevent the girder support from coming off.

[0008]

According to the first aspect of the present invention, reference numerals used in the embodiments are used to describe the invention.
And the connecting member 25 having the rotating metal member 23 to the earth retaining panel 4.
In the connecting device 50 that inserts into the first mounting fixture 43 and turns the rotary fitting 23 to press the locking portion 25 b against the mounting fixture 43 to connect the cutting beam support 20 to the earth retaining panel 41, the connecting device 50 rotates around the rotary fitting 23. The stopper 63 is provided movably,
When the cutting beam support 20 is connected to the earth retaining panel 41, the rotation stopper 23 is moved to fix the rotating metal member 23 to the earth retaining panel 41 in a state of preventing rotation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an open-cutting method or the like, as shown in FIG.
Are connected by a connecting device 50, and earth retaining panels 41, 41 held at predetermined intervals are installed at the excavation site.

First, the girder support 20, the retaining panel 41 and the connecting device 50 will be described, and then the detent device 60 according to the first embodiment of the present invention will be described.

5 and 6, the cutting beam support 20 comprises an outer pipe 21 and an inner pipe 22 fitted to the outer pipe 21 and movable in the axial direction. A rotating fitting 23 is attached to an end of the outer pipe 21, and a buffer member 24 is attached to a side surface of the rotating fitting 23. The rotating fitting 23 is formed with an operation portion 23b that extends from the base portion 23a corresponding to the outer pipe 21 to one side.

As shown in FIG. 7, the connecting member 25 includes a shaft portion 25a and a rectangular locking portion 25b protruding outward on both ends at one end of the shaft portion 25a, and has a T-shape as a whole. ing. The other end of the shaft portion 25a (not shown) penetrates the cushioning member 24 and is fixed to the rotating bracket 23.
The side surface of the locking portion 25b on the buffer member 24 side has a mountain shape having a high center and retreating toward both sides.

The inner pipe 22 is also connected to the outer pipe 2.
The rotating bracket 23, the cushioning member 24, and the connecting tool 25 are attached to the end opposite to 1.

At the end of the outer pipe 21, a rotating fitting 23 is provided.
, A base 26 is mounted, and a pair of bevel gears 27 is mounted inside the base 26. The handle-side gear 28 constituting the bevel gear 27 is rotated by a handle 29 inserted into the outer pipe 21, and the screw-side gear 30 driven by the handle-side gear 28 is rotatably supported on the base 26. Is fixed to the rotating shaft 31.

A screw 32 is formed on the rotating shaft 31, and a nut 33 screwed to the screw 32 is attached to the inner pipe 22. When the handle 29 is rotated, the handle-side gear 28 and the screw-side gear 30 are rotated, and the inner pipe 22 is moved right and left via a nut 33 screwed into the screw 32, whereby the cutting beam support 20 is The length can be adjusted. The base 26 and the nut 33
And a thrust bearing 34 is interposed between them.

In FIG. 8, a vertical beam 42 is attached to both sides of a retaining panel 41, and a plurality of U beams are provided here.
A letter-shaped attachment 43 is attached.

Next, referring to FIG. 9 and FIG.
3 will be described. The insertion hole 44 has a shape corresponding to the locking portion 25b of the connecting tool 25, and a circular guide portion 45 is provided so as to surround the insertion hole 44. On the inner side of the guide portion 45, a thin temporary fixing portion 46 is formed continuously in the circumferential direction to the insertion hole 44, and a thick tightening portion is provided at an intermediate position therebetween so as to be sandwiched by the temporary fixing portion 46. 47 are formed. A groove 48 is formed at the center of the fastening portion 47. An inclined surface is formed on a side surface of the fastening portion 47. The connecting device 25 is configured by the connecting tool 25 attached to the cutting beam support 20 and the mounting tool 43 attached to the retaining panel 41.

The earth retaining panel 41 is formed by the connecting device 50.
When the cutting beam support 20 is connected to the cutting beam support 20, the operating portion 23b of the rotating bracket 23 of the cutting beam support 20 is horizontally held, and the locking portion 25b is inserted into the insertion hole 44 of the fixture 43. FIG.
See 1 (a)}. The outer peripheral portion of the locking portion 25b is
{See FIG. 11 (b)}. Then, when the operating part 23b of the rotating metal fitting 23 is rotated by about 30 degrees (see FIG. 12A), the locking part 25b moves onto the temporary fixing part 46, and the cutting beam support 20 is attached to the earth retaining panel 41. Temporarily fixed (see FIG. 12B).

Further, when the operating portion 23b of the rotating bracket 23 is rotated by about 60 degrees {see FIG.
b rides on the tightening portion 47 along the inclined surface, and its tip is locked in the groove portion 48 (see FIGS. 13B and 13C). The cushioning member 24 is strongly compressed, so that the girder support 20 is securely fixed to the retaining panel 41. In this case, the operation part 23b of the rotating bracket 23 is located directly below.

Next, the detent device 60 will be described with reference to FIGS.
This will be described with reference to FIGS. It should be noted that illustration and description of the same parts as those described above are omitted. As shown in FIG. 7, both sides of the base 23a are bent so that the turning bracket 23 has folded pieces 61, 61 parallel to the long axis direction.
Are formed. Further, a through hole is formed substantially at the center of the folded pieces 61 on both sides, and a fixing nut 62 is fixed to the inside of the through hole by welding.

As shown in FIG. 3, the rotation stopper 63 has a U-shape as a whole by folding both sides 63a.
A long hole 64 is formed at the center. As shown in FIGS. 1 and 2, the rotation stopper 63 is attached to the rotating bracket 23 so that both sides 63 a straddle the folded piece 61, and is moved in the direction of arrow A and the direction opposite to arrow A. , Slot 64
Is fixed by screwing a screw 65 inserted into the fixing nut 62. A screw 65 is provided at the end of the slot 64.
A counterbore 66 corresponding to is formed.

The tip of the rotation stopper 63 is always flush with the tip of the rotating bracket 23, for example, the folded piece 61 (FIG. 2).
), When moved in the direction of arrow A, the tip protrudes toward the retaining panel 41, and the tip is the vertical beam 4 of the retaining panel 41.
Opposite to 2.

Next, the operation of the above configuration will be described.
First, before connecting the girder support 20 to the earth retaining panel 41, the operation part 23b of the rotating bracket 23 is held horizontally. In this case, since the rotation stopper 63 is flush with the folded piece 61 of the rotating metal 23 (see FIG. 2), there is no hindrance to the operation of the rotating metal 23.

When the cutting beam support 20 is connected to the retaining panel 41, the operating portion 23 b of the rotating bracket 23 is turned right below, and the folded piece 61 is parallel to the side surface of the vertical beam 42 of the retaining panel 41. (See FIG. 1). Next, rotation stopper 6
3 is moved in the direction of arrow A, and the tip becomes a retaining panel 41.
Protruding to the side, the detent 63 opposes the vertical beam 42 at a slight interval. Then, the screw 65 is fixed to the fixing nut 62.
And the rotation stopper 63 is fixed to the rotation fitting 23. Since the counterbore 66 is provided on the tightening surface of the screw 65, the tightening state is stable.

Here, the cutting beam support 20, that is, the rotating fitting 2
If the angle of 3 is slightly deviated, the detent 63 collides with the retaining panel 41 to prevent further deviation.

In the above embodiment, the detent 6
3 is opposed to one side surface (the right side shown in FIG. 1) of the vertical beam 42, but is not limited thereto, and may be opposed to the other side surface (the left side shown in FIG. 1) of the vertical beam 42.

According to the first embodiment, the following effects can be obtained. (1) Since the rotation stopper 63 is provided so as to be movable with respect to the rotating bracket 23, it is always flush with the surface of the rotating bracket 23, and there is no hindrance to the operation of the rotating bracket 23. (2) When the girder support 20 is connected to the retaining panel 41, the detent 63 is moved to move the retaining panel 4.
Since the vertical beam 42 is opposed to the first vertical beam 42 at a small interval, even if the angle of the cutting beam support 20, that is, the rotation bracket 23 is slightly deviated, the detent 63 collides with the earth retaining panel 41, and further deviation is caused. Is prevented.

FIG. 14 shows a detent device 70 according to a second embodiment of the present invention. The difference from the first embodiment is that both end portions of the folded piece 61 of the rotating bracket 23 project sideways. The engaging portion 71. A so-called spring pin 72 is provided substantially at the center of the folded piece 61. The spring pin 72 is normally urged outward by a spring so as to be movable outward, and always protrudes. When pressed from the outside, the spring pin 72 retracts to the surface of the folded piece 61.

The anti-rotation member 73 is formed in a plate shape.
It is set to 4. The rotation stopper 73 is engaged with the insertion part 74 in the engagement part 71 and moves in the direction of the arrow, and engages the hole 75 with the spring pin 72 to be fixed to the rotating bracket 23.

At this time, the insertion portion 74 faces the vertical beam 42 of the retaining panel 41 at a slight interval, and
Is fixed to the retaining panel 41 in a detented state.

In the second embodiment, a spring pin 72 is provided on the folded piece 61 and a hole 75 is formed in the rotation stopper 73.
Was formed, but a spring pin 72 was provided on the rotation stopper 73,
The spring pin 72 may be engaged with a hole formed in the folded piece 61.

FIG. 15 shows a detent device according to a third embodiment of the present invention. The difference from the first embodiment is that the detent device 81 is U-shaped, and Folded piece 6
1 is inserted between the shock absorber 24 and the cushioning member 24. The rotation stopper 81 is fixed by engaging a concave portion 82 formed on one surface portion 81 a with the buffer member 24. At this time, the surface portion 81a of the rotation stopper 81 is fixed to the earth retaining panel 41.
Facing the vertical beam 42 at a slight interval,
3 is fixed to the earth retaining panel 41 so as not to rotate.

The second and third embodiments also have the same effects as the first embodiment.

[0034]

According to the first aspect of the present invention, a connecting tool attached to a cutting beam support in an open-cutting method or the like and provided with a locking portion and a rotating metal fitting is inserted into a mounting tool of a retaining panel, and the rotating metal fitting is mounted. In the connecting device for connecting the cut beam support to the retaining panel by pressing the locking portion against the mounting tool by turning the locking device, a rotation stopper is movably provided on the rotating metal fitting, and the cut beam support is provided. When connected to the retaining panel, the detent is moved to fix the rotating bracket in a detented state relative to the retaining panel, so that even when vibration is applied, There is an effect that the coupling force between the support and the retaining panel is not loosened, so that it is possible to prevent the cutting beam support from being shifted or coming off.

[Brief description of the drawings]

FIG. 1 is a perspective view of a detent device according to a first embodiment of the present invention in a detent state.

FIG. 2 is a perspective view in a state where a rotating bracket is being operated.

FIG. 3 is a perspective view of a rotation stopper.

FIG. 4 is a perspective view in which earth retaining panels are connected by cutting beam supports.

FIG. 5 is a longitudinal sectional front view of a cutting beam support.

FIG. 6 is a cross-sectional plan view of a cutting beam support.

FIG. 7 is a perspective view of an end of a cutting beam support.

FIG. 8 is a front view of the retaining panel.

FIG. 9 is a perspective view of a fixture.

FIGS. 10A and 10B are cross-sectional views taken along each break line in FIG. 9; FIG. 10A is a cross-sectional view taken along a line a; FIG. 10B is a cross-sectional view taken along a b line; (D) is a cutaway development view along the d-line.

11A and 11B are diagrams showing a first step of connecting the retaining panel with a cutting beam support, wherein FIG. 11A is a front view, and FIG.
Is a partially cutaway side view.

FIGS. 12A and 12B are views showing a second step, in which FIG. 12A is a front view, and FIG. 12B is a cross-sectional view along line b.

FIGS. 13A and 13B are diagrams showing a third step, wherein FIG. 13A is a front view, FIG. 13B is a cross-sectional view along line b, and FIG. 13C is a cross-sectional view along line c.

FIG. 14 is a perspective view of a detent device according to a second embodiment of the present invention in a detent condition.

FIG. 15 is a perspective view of a detent device according to a third embodiment of the present invention in a detent state.

FIG. 16 is a perspective view showing a state in which a girder support is connected to a retaining panel in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Cut beam support 23 Rotating bracket 23a base 23b operation part 25 Connecting part 25a shaft part 25b locking part 41 Soil retaining panel 43 Mounting part 50 Connecting device 60 Detent device 61 Folded piece 62 Fixing nut 63 Detent member 64 Long hole 65 Screw 70 Detent device 72 Spring pin 73 Detent device 80 Detent device 81 Detent device

Claims (1)

[Claims] 1. A fastening device attached to a girder support in an open-cutting method or the like, which is provided with a locking portion and a rotating metal fitting, is inserted into a mounting tool of a retaining panel, and the rotating metal fitting is turned to form the locking portion. A connection device that presses against the mounting fixture to connect the girder support to the retaining panel, wherein a rotation stopper is movably provided on the rotating bracket, and the girder support is coupled to the retaining panel. The detent device of the girder support, wherein the detent device is moved to fix the rotation fitting to the retaining panel in a detented state.