JP3475211B2 - Excavation soil retaining device - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to city gas, water and sewage,
An earth-cutting support device for a trench to be excavated for burying a main pipe of a telephone line or the like in the ground, in particular, an expandable cutting type that supports a soil retaining panel facing in the groove width direction or a guide rail or a supporting beam for waving a sheet pile. The present invention relates to a soil retaining device that simplifies connection and opening of beams and can secure a large passage width for descending a main pipe.

[0002]

2. Description of the Related Art Conventionally, as a soil retaining device for a trench to be excavated for burying main pipes of city gas, water and sewage, telephone lines, etc. in the ground, guide rails that are erected at predetermined intervals along both sides of the excavation trench. And an earth retaining panel slidably fitted between the guide rails for retaining the excavation groove, and an earth retaining device including a beam to connect and support guides facing each other in the groove width direction,
Further, a soil retaining device consisting of soil retaining panels facing each other in the groove width direction and a cross beam connecting and supporting both left and right ends of the opposing soil retaining panels, and further driving along the inner walls of the excavating trench facing each other. There is a well-known earth retaining device including a dirt retaining sheet pile, an upsetting support beam that presses the soil retaining sheet pile, and a cut beam that connects and supports the upsetting support beams.

Usually, 3-4 cutting beams are provided in the up-down direction with respect to the guide rails or the soil-retaining panel in each of the above-mentioned soil retaining devices. It is also provided at short intervals even in the lengthwise direction of the excavation trench, and is effective for holding earth retaining panels or sheet piles. However, it is extremely inconvenient for laying a buried pipe, particularly for laying a pipe having a relatively large diameter such as a main pipe for city gas or water and sewage and having a length of 10 to several tens of meters. Therefore, as a solution to this problem, the girders are hinged to at least one of the guide rails facing each other so as to be rotatable in the horizontal direction, and the girders are sequentially moved along with the movement of the pipe to be lowered to the embedded setting position. There is an earth retaining device that horizontally rotates a traverse that obstructs the passage to secure a descending passage for the pipe, and immediately returns it to the original state after passing the pipe (as a prior art document, Japanese Utility Model Publication No. 56-51086).
There is a gazette).

By the way, in such a soil retaining device, in one of the excavation grooves between the soil retaining panels which are opposed to each other, from one side, the attachment member and the locking beam main body locking member, and from the other side, the mounting member and the cutting beam main body pivot. Since the attachment member is projected, the passage for lowering the pipe to the burying position is narrow, which makes the pipe laying work troublesome. As the pipe moves and descends, the beam main body that obstructs the passage is sequentially removed from one locking member and horizontally pivoted around the other pivot member to secure the passage for the pipe to pass through the pipe. Immediately afterward, the work to return to the original state and put it in the erected state was done by the worker entering the excavation groove, so there was a problem in safety, moreover, the number of times of attachment and detachment of the cutting beam was large, and the conventional turnbuckle type A spindle, a screw type jack, a hydraulic jack, a pneumatic jack, a hydraulic jack, and the like, a beam main body, its pivotally-attached member, and a locking member are labor-intensive and inefficient.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention improves the cutting beam, facilitates the cutting beam attaching / detaching operation, and allows the cutting beam attaching / detaching operation to be performed mostly on the ground, and rotates the cutting beam. An object of the present invention is to provide a soil retention support device for an excavation groove, which is capable of ensuring a large passage width in the excavation groove for descending a pipe.

[0006]

A soil retaining device for excavation trenches according to the present invention for solving the above-mentioned problems is provided with guide rails which are erected at predetermined intervals along both sides of the excavation trench and adjacent on both sides of the excavation trench. Earth retaining panel equipped with a retaining rail panel slidably fitted between the guide rails and a girder connecting the guide rails facing each other in the groove width direction, or standing up continuously along both sides of the excavation trench. The earth retaining panel provided with the earth retaining panel and the cross beam connecting between the earth retaining panels facing each other in the groove width direction, or the earth retaining sheet pile continuously driven along both sides of the excavation groove, and the earth retaining sheet pile. In a soil retaining device provided with a support beam for urging that presses down and a cross beam that connects between support beams for provoke that are opposed to each other in the groove width direction, the cut beam is composed of an automatically expandable / contractible jack. Bonded to the beam body and one end of the beam body A proximal end connector having a pivotal support portion at its distal end, and a pivotal support portion pin-connected to the pivotal support portion of the proximal end connector is provided on the outside of the tubular portion, and inside the tubular portion, a guide rail, an earth retaining panel, or an abdomen is raised from the outside. Base beam member with a locking member fitted and fixed to the support beam by means of a wedge, and a tip connector having an engaging flange at the tip provided integrally or in pin connection with the other end of the beam body. And a wedge-shaped wedge having an inner end arc shape that holds the engagement flange of the tip connector from both left and right sides.
A locking member that includes two engaging plates for biasing the springs that are symmetrically provided with recesses having engaging inclined surfaces and that prevents the guide rail, the soil retaining panel, or the uprising support beam from coming off from the outside. Is configured by a tip beam support that is fitted and fixed with a wedge,
The engagement flanges at the tip of the tip connector are locked to the outer sides of two spring-biased engagement plates that are retained from the left and right sides .
It is engaged against the spring by pushing the release lever from the ground into the concave part with the wedge engaging inclined surface
It is characterized in that the plate is retracted to the outside on both the left and right sides to release it.

In the earth retaining device for excavation trenches described above, a base end connecting member connected to one end of the main body of the girder and a locking member for preventing the guide rail, the earth retaining panel, or the uprising support beam from coming off. With the base end beam support which is inserted into the cylinder and fixed by wedges, the pins are connected by two pivots, and when the pipe is laid at the bottom of the excavation trench, one pin of one pivot is pulled out and the other The beam main body may be rotated by the pivot portion. Further, in the soil retaining device for excavation trenches, the base end coupling tool coupled to one end of the cutting beam main body and the guide member or the retaining member for retaining the soil retaining panel or the uplifting support beam are provided as a tubular portion. It may be pin-joined with a single pivotal support to the base-end beam support that is fitted in and fixed by wedges.

[0008]

The earth retaining device for excavation trenches of the present invention configured as described above has the guide rails standing up along both sides of the excavation trench or the left and right end portions of the soil retaining panels at the required level in the vertical direction. Longitudinal holes that have been drilled or mounting holes that are drilled in the support beams for raising and lowering the ups and downs of the soil retaining sheet piles that face each other, and the locking members and tips that are fixed by wedges to the base-end beam receivers, respectively. A locking member for fixing a wedge to the cut beam receiving member is fitted, and the locking member is rotated by 90 degrees to prevent it from slipping out, and the wedge is driven further deeply to attach the locking member to the guide rail, the earth retaining panel, or the support beam for raising the belly, respectively. Tighten tightly on the inner surface. Then a tip engaging flange of the tip connector provided at the other end to couple the other end of Setsuhari body pivot portion of the proximal Setsuhari receiving fixture, left and right sides
From the inner side to the circular arc shape with a wedge engaging inclined surface toward the outer side
The parts are locked by two spring-biased engagement plates provided symmetrically to prevent the parts from coming off. After that, the traverse main body is actuated and extended to hold the guide rail, the earth retaining panel or the earth retaining sheet pile in a predetermined groove width.

When laying a pipe such as a sewer pipe, the girder main body
Align the engaging flanges at the tips of the
To the outside of the two spring-loaded engagement plates that are stopped
The release latch is placed in the recess that has symmetrical wedge engagement slopes.
Push the bar from the ground and engage the plate against the spring.
Back to the left and right both sides , unfasten the engagement flange to automatically shorten the cutting beam main body, and to connect the one end of the cutting beam main body with the pivotal support portion and the proximal cutting end of the proximal end connector. The traverse main body is pivoted about a pin connecting with the pivot of the beam receiver to form a passage for lowering the pipe.

The passage for descending the pipe thus formed is located in the excavation groove between the soil retaining panels or the sheet piles for soil retaining facing each other, and the base end connecting member and the base end connection of the main member of the rotating girder which is rotated from one side. The tool and the tip cutting beam receiver project from the other, but the base end cutting beam receiver and the tip cutting beam receiver are tightened and tightly attached to the guide rail or the earth retaining panel or the support beam for waving, and the The amount of protrusion is very small, and the width of the base end connector of the beam main body is also small, and the amount of protrusion is small, so that it is significantly wider than the passage for lowering the pipe in the conventional earth retaining device. Further, in the earth retaining device for excavation trench of the present invention, the cutting beam main body can be attached / detached on the ground without the worker entering the excavation trench, and the cutting beam main body can be automatically expanded / contracted. Therefore, workability and safety are improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the earth retaining device of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a guide rail standing upright on both sides of the excavation groove A at a required interval, and 2 is an earth retaining panel slidably fitted between the adjacent guide rails 1 and 1 on both sides of the excavation groove A. is there. That is, the guide rail 1 is formed with lip-shaped guide grooves 1a on both sides in the longitudinal direction of the excavation groove A.
Are formed, and the side edges of the soil retaining panel 2 are slidably fitted in the guide grooves 1a in the vertical direction. Reference numeral 3 is a girder that connects the guide rails 1 and 1 facing each other in the groove width direction of the excavation groove A.

As shown in FIG. 2, the cutting beam 3 is a cutting beam main body 4 composed of a hydraulic jack which can be expanded and contracted and is urged by a built-in spring in a shortening direction, and a pin 5 at one end of the cutting beam main body 4. The tubular portion 6 is coupled to the tubular portion 6 at the outer ends of the tubular portion 6, and the base end connector 9 having two pivotally supporting portions 8 at the ends of the left and right sides of the groove plate 7 as shown in FIG. Pivot portions 11 that are connected to the pivot portions 8 of the connector 9 by the pins 10 are provided on the inner surface of the plate 12 on both left and right outer sides of the tubular portion 13,
2, a base end shed beam receiver 16 having a locking member 15 fitted into the tubular portion 13 from the outer surface side and stopped by a wedge 14 from above, and a pin 17 at the other end of the shed beam main body 4 as shown in FIG. And a cylindrical tip connector 21 having a notch 20 provided vertically on the outer circumference of a large-diameter tube portion 18 ′ having an engaging flange 19 at the tip thereof, and the tip connector. A cylindrical portion 22 into which a large-diameter cylindrical portion 18 ′ of 21 is fitted is provided on the inner surface of the plate 23, and is biased by a leaf spring 24 that holds the engaging flanges 19 on both the left and right outer sides of the cylindrical portion 22. A tip cutting beam receiver 28 having an engaging plate 25 and an engaging member 27 which is fitted into the tubular portion 22 from the outer surface side of the plate 23 and fixed by a wedge 26 from above.
It is composed of and.

As shown in FIG. 5, the engaging plates 25 urged by the plate springs 24 are spring boxes 2 provided on the left and right sides of the inner surface of the plate 23 of the tip beam receiver 28.
It is provided in each of 9. That is, in the spring boxes 29 on both the left and right sides, the engagement plates 25 each having an inner end arcuate shape and having an inclined surface 31 inclined in the arcuate edge 30 at the arcuate edge 30 are slidably provided in the left-right direction, A pin 32 is inserted in the middle of each engaging plate 25, and a recess 33 in the middle of the arc-shaped plate spring 24 is engaged with the pin 32, so that the plate spring 2
4 urge the engaging plates 25 in opposite directions.
A concave portion 35 having a wedge engaging inclined surface 34 is symmetrically provided on the outer side of the two engaging plates 25, and a leaf lever 2 is formed by pushing a release lever 36 shown in FIG.
4, the engaging plate 25 is retracted, the engaging flange 19 at the tip of the tubular portion 18 'is released, and the cut beam main body 4 is urged by a spring incorporated therein to be shortened.

2 and 3 are provided on the outer surfaces of the plate 12 of the base end beam receiver 16 and the plate 23 of the tip end beam receiver 28.
As shown in FIG. 7, cushioning members 37 are attached to the four sides of the locking members 15 and 27, respectively, and the outsides of the beams 12 and 23 are outwardly bent so that the beams 3 can be alternately tilted in the groove width direction. Plates 38 projecting in the shape of are respectively provided.

The earth retaining device for excavation trenches of the embodiment thus constructed has a required level of the guide rails 1, 1 which are opposed to each other and are erected along both sides of the excavation trench A as shown in FIG. T-shaped hooks 15a of the locking member 15 of the base end beam receiving member 16 and the locking member 27 of the tip cutting beam receiving member 28 of the cutting beam 3 shown in FIGS. , 27a are fitted and rotated by 90 degrees to prevent them from coming off, and then the wedges 14 and 26 are driven deeper as shown in FIG.
Tighten 5 and 27 to the inner surface of the guide rails 1 and 1 so that they are in close contact. Next, the pivotal support parts 11 on both left and right sides of the base end beam support 16
In addition, as shown in FIG.
4 is engaged with the tube portion 22 of the tip beam member receiver 28, which is connected to the other end by actuating the beam body 4 and for engaging the tip thereof. The engaging plate 25 urged by the leaf spring 24 by the flange 19 is pushed open to the outside to get over it, and then the engaging flange 19 is locked by the engaging plate 25 to prevent it from coming off. After that, the girder main body 4 is actuated and extended to hold the guide rails 1, 1 and thus the soil retaining panels 2, 2 in a predetermined groove width as shown in FIG.

When laying a pipe such as a sewer pipe, as shown in FIG. 6, an engaging plate 25 urged by a plate spring 24 shown in FIG. When it is slid outwardly and the engagement flange 19 at the tip of the tip connector 21 is released, the beam main body 4 is shortened by a spring installed as shown in FIG. The tip connector 21 is released when it is disengaged from the receiver 28. Next, the pin 10 is pulled out from one of the left and right sides of the proximal end coupling tool 9 connected to one end of the truss main body 4, the left side of the left side of the proximal truss support 16 in FIG. 6 side. The connection with the pivot 11 is released. Then, the pin 10 connecting the right pivot portion 8 of the proximal end connector 9 of the truss main body 4 and the right pivot portion 11 of the proximal truss receiver 16 is mainly shown in FIG.
And, as shown in FIG. 7, the beam main body 4 is rotated 90 degrees in the horizontal direction to form a passage for lowering the pipe.

The passage for descending the pipe thus formed is located in the excavation groove A between the soil retaining panels 2 and 2 which face each other, and the base end beam support 16 and the beam main body rotated 90 degrees horizontally from one side. Although the tip end beam support 28 projects from the base end connector 9 of 4 and the other end, the base end beam support 16 and the tip end beam support 28 are tightened and closely attached to the inner surfaces of the guide rails 1, 1. However, since only the cylindrical portions 13 and 22 are projected, the amount of projection is very small, and the base end connector 9 of the beam main body 4 is also narrow in width and the amount of projection is small. It is significantly wider than the passage through which the tube in the support device descends. In comparison with the case where the groove width of the excavation groove A is actually 1 m, in the conventional soil retaining device, the passage for lowering the pipe is 70 cm at maximum.
However, in the soil retaining device of this embodiment, the passage through which the pipe descends was about 85 cm. Therefore, when a pipe having an outer diameter of 60 cm is lowered, the pipe can be smoothly lowered with a margin without colliding the pipe with the base end connector 9 and the tip beam support 28, and the work efficiency is improved. .

Further, in the above-described embodiment, the cutting beam main body 4 can be attached and detached on the ground without the worker entering the excavation groove A, and the cutting beam main body 4 can be automatically expanded and contracted. Therefore, workability and safety are improved. In the above embodiment, the tip connecting member 21 is attached to the pin 17 at the other end of the beam main body 4.
8, the tip connecting tool 21 having the engaging flange 19 that is retained by the engaging plate 25 biased by the leaf spring 24 is provided at the other end of the beam main body 4 as shown in FIG. It may be provided integrally. The engaging plate 25 biased by the plate spring 24 is arranged in a spring box 29 'fixedly provided on the front surface of the cylindrical portion 22 on the inner surface of the plate 23 of the tip-cut beam receiver 28, as shown in FIG. A circular hole 29a into which the tip connector 21 at the other end of the beam main body 4 is fitted may be provided on the front surface of the spring box 29 '. According to this modification, the circular hole 2
9a is fitted with the tip connecting tool 21 at the other end of the beam main body 4, and the engaging plate 25 urged by the leaf spring 24 by the engaging flange 19 at the tip thereof is pushed outward to get over,
The engagement flange 19 is locked by the engagement plate 25 and is prevented from coming off. Further, in the above embodiment, the base end connector 9 and the base end beam receiver 16 which are connected to one end of the main beam body 4 by the pin 5 are connected by two pivot portions, that is, the base end connection. The two pivotal support portions 8 on the left and right ends of the grooved plate 7 of the tool 9 and the two pivotal support portions 11 on the inner left and right sides of the inner surface of the plate 12 of the base end truss receiver 16 are joined together by the pins 10. But
The proximal end connecting tool 9 and the proximal end beam receiving tool 16 may be connected by one pivotal support as shown in FIGS. 9 and 10, respectively.

In FIG. 9, a pivotal support portion 40, which is U-shaped when viewed from the side, is provided at the front end of the tubular portion 6 of the base end connector 9 connected to one end of the beam main body 4 with a pin 5. A long hole 41 is provided in the longitudinal direction of the truss main body 4 at the center of both upper and lower sides, and on the other hand, a cylindrical pivotal support portion 42 is concentrically provided on the front surface of the rectangular tubular portion 13 of the base end truss receiver 16. A pin hole 43 is penetratingly formed in the vertical direction of the pivotal support portion 42, and the pivotal support portion 40 of the proximal end connecting tool 9 is formed.
Is fitted to the pivotal support portion 42 of the base end beam receiving tool 16, the long hole 41 and the pin hole 43 are aligned, and the pin 44 is inserted and prevented from coming into contact with the base end connecting beam 9 to attach the base end connecting beam 9 to the base end cutting beam receiver. It is connected to the tool 16.
In the case of this embodiment, after laying a pipe such as a sewer pipe at the bottom of the excavation groove, after removing the tip connector 21 of the girder main body 4 from the tip girder receiver 28 as shown in FIG. , Beam main body 4
Is pulled toward the tip truss receiver 28, that is, in the direction of the arrow X in FIG. 9, and the proximal end connector 9 is moved along the pin 44 through the long hole 41, and then the proximal end connector 9 is centered around the pin 44. The traverse main body 4 is horizontally rotated 90 degrees leftward or rightward as shown by the two-dot chain line to form a passage for lowering the pipe.

FIG. 10 shows a base end connector 9 at one end of the beam main body 4.
A U-shaped pivotal support portion 45 is provided at the front end of the cylindrical portion 6 of the above, and a long hole 46 is provided in the longitudinal direction of the cut beam main body 4 at the center of both left and right sides of this pivotal support portion 45, while the base end cut beam is provided. A columnar pivotal support portion 42 is concentrically provided on the front surface of the rectangular tubular portion 13 of the receiver 16, and a pin hole 47 is formed in the lateral direction of the pivotal support portion 42 so as to penetrate therethrough. The support 43 is used as a base end beam support 16
The base end connector 9 is fitted to the pivotal support portion 42, the long hole 46 and the pin hole 47 are combined, and the pin 48 is inserted and prevented from coming into contact therewith, so that the proximal end connector 9 is connected to the proximal end beam receiver 16. In this example,
When a pipe such as a sewer pipe is laid at the bottom of the excavation groove, the tip connecting member 21 of the cutting beam main body 4 is detached from the tip cutting beam receiving member 28 and released as shown in FIG. Beam support 28
After pulling the side end, that is, the direction of the arrow X in FIG. 10, to move the proximal end connector 9 along the pin 48 through the elongated hole 46,
The girder main body 4 is pivoted upward or downward 90 degrees vertically as shown by the double-dashed line via the proximal end connector 9 around 8 to form a passage for lowering the pipe. In this way, when the proximal end connecting tool 9 and the proximal end beam supporting tool 16 are connected by one pivotal support, FIG.
When a pipe such as a sewer pipe is laid at the bottom of the excavation groove as in the above-mentioned embodiment shown in FIG. 1, the pin 1 of one of the two pivot parts is
Since the work of extracting 0 is unnecessary, the pipe laying work is further simplified.

[0021]

As described above, according to the earth retaining support device for excavation grooves of the present invention, the guide rails or the earth retaining panels of the inner wall of the grooving groove or the supporting beams for raising the earth retaining sheet pile are connected to each other. The work of removing and attaching the cutting beam becomes easy, and most of the work of removing the cutting beam can be performed on the ground. Moreover, since the cutting beam can be automatically shortened and rotated, the pipe can be rotated. When laying on the bottom of the trench, the work of forming the passage through which the pipe descends can be performed efficiently and safely. Also, when the cutting beam is rotated to form a passage for lowering the pipe, the amount of protrusion of the connecting member of the cutting beam body into the excavation groove is very small. Without colliding the pipe with the connecting member of the main body of the beam.
It can be lowered smoothly with a margin, and the efficiency of pipe laying work is improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a soil retaining device of the present invention.

FIG. 2 is a perspective view showing an example of a girder in the earth retaining device of the present invention.

FIG. 3 is an exploded perspective view of a base end of the beam of FIG.

FIG. 4 is a perspective view of a tip end side of the beam of FIG.

FIG. 5 is an exploded perspective view of FIG.

FIG. 6 is a perspective view showing a state in which the beam main body of FIG. 2 is horizontally rotated by 90 degrees to form a passage for lowering a pipe.

FIG. 7 is a plan view of FIG.

8 is a perspective view showing another example of the tip end side of the beam of FIG.

FIG. 9 is a perspective view showing another example of the base end side of the beam of FIG.

FIG. 10 is a perspective view showing still another example of the base end side of the beam of FIG.

[Explanation of symbols]

A excavation trench 1 Guide rail 2 Dodome panel 3 beams 4 Girder main body 8 pivotal branches 9 Proximity connector 10 pin 11 pivotal branch 13 Tube 14 Wedge 15 Locking member 16 Base end beam receiver 19 Engaging flange 21 Tip connector 24 leaf spring 25 Engagement plate 26 Wedge 27 Locking member 28 Tip-cut beam receiver 36 Release lever 40 pivotal branch 42 pivotal branch 44 pin 45 pivot 48 pins

Continuation of the front page (56) References Kaikaihei 6-87433 (JP, U) Kaikaihei 1-84340 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 17 / 08

Claims (3)

(57) [Claims] 1. A guide rail standing upright at a required interval along both sides of the excavation groove, and an earth retaining panel slidably fitted between adjacent guide rails on both sides of the excavation groove, facing each other in the groove width direction. An earth retaining device provided with a girder for connecting the guide rails, or an earth retaining panel continuously standing along both sides of the excavation groove, and a connecting girder connecting the earth retaining panels facing each other in the groove width direction. Soil retention support device, or a soil retaining sheet pile that is continuously driven along both sides of the excavation trench, and a support beam for raising the soil retaining sheet pile.
In a soil retaining device device comprising a sill beam connecting between the upright support beams that face each other in the groove width direction, the sill beam is a sill beam main body formed of an automatically expandable and contractible jack, and one end of the sill beam main body. A proximal end connector having a pivotal support portion at the distal end and a pivotal support portion pin-coupled to the pivotal support portion of the proximal end connector is provided on the outside of the tubular portion, and a guide rail or a soil retaining panel or belly is provided inside the tubular portion from the outside. A base end girder receiver in which a locking member for preventing the slipping-off from the raising support beam is fitted and fixed by a wedge, and a tip having an engaging flange at the tip provided integrally or in pin connection with the other end of the girder main body. A connecting member and a concave portion having an inner end arc shape that holds the engaging flange of the tip connecting member from both left and right sides and having a wedge engaging inclined surface toward the outer side are symmetrically provided.
A tip-cutting beam receiver having a spring-biased engagement plate and a locking member that is fitted and fixed to the guide rail, the earth retaining panel, or the abutment supporting beam from the outside to prevent it from slipping off. By pushing the release lever from the ground into the concave portion having the wedge engaging inclined surface symmetrically provided on the outer side of the two spring-biased engaging plates that hold the engaging flanges at the tip of the connecting tool from both left and right sides. An earth retaining device for excavation grooves, characterized in that the engaging plate is retreated to the left and right outer sides against the spring to release it. 2. The earth retaining device for excavation trenches according to claim 1, wherein a base end connecting member connected to one end of the cutting wedge body and a retainer for retaining the guide rail, the earth retaining panel, or the support beam for uplifting. When the pipe is laid at the bottom of the excavation groove, the pin of one pivotal support is pulled out when the stopper member is inserted into the cylindrical part and fixed by wedge-locking with the proximal end wedge receiver. The earth retaining device for excavation trench, wherein the beam main body is rotated by the other pivotal support. 3. The earth retaining device for excavation trenches according to claim 1 , wherein the proximal end connecting member connected to one end of the beam main body and the guide rail, the earth retaining panel, or the support beam for waving are prevented from coming off. An earth retaining device for excavation trenches, characterized in that a locking member is fitted to a cylindrical portion and fixed to a wedge and fixed to a base end beam support by pin connection with one pivotal supporting portion.