JPH0959988A - Retreat operating method of strut in trench timbering structure of excavated ditch and lever for retreat operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retreat a strut up to a place, where the width of the strut is not a hindrance, without the entering of an operator into a ditch at the time of the retreat of the strut in the trench timbering structure of the excavated ditch. SOLUTION: An extensible strut having two orthogonal shafts on the base end side is bridged between opposed supports and/or waling materials. A section near to the base end of the strut is held from an upper section by a forked member 4 fixed at the lower end of a bar 2, and the strut is rotated horizontally centering around the vertical shaft and brought to an approximately parallel state with the waling material. A bar piece 5 pivotally supported to the lower end section of a bar 2 by a horizontal shaft 6 rotatably in a fixable manner within the range of the point of the centroid and base end of the strut is inserted into a clearance between the strut and the waling material from a lower section, and the front end of the bar piece 5 is caught on the upper side of the waling material. The bar 2 is pulled up as the front end of the bar piece 5 is left as it is caught, and the strut is turned vertically centering around the horizontal shaft and placed on the upper section of the waling material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a method for retracting a girder in a soil retaining structure for a trench excavated for laying a gas pipe, a water / sewer pipe, a buried pipe such as an electric wire / telephone cable. Regarding the lever.

[0002]

2. Description of the Related Art Most of the laying work of buried pipes is usually performed by an open-cutting method. For example, sheet piles are struck on both sides of the trench excavated to the pipe burial depth, the bellows members are horizontally applied along the trenches, and the gap between the bellows members facing each other in the trench is supported by a cutting beam to apply earth pressure. There is a method in which excavation proceeds in the extension direction of the buried pipe while preventing the sheet pile from collapsing. However, this method requires the worker to enter the groove and attach and detach the abdomen and the cut beam to prevent the sheet pile from falling during the laying operation by hanging the buried pipe after excavating the groove. Therefore, there is a problem in ensuring safety. In order to solve such problems and further improve work efficiency, various support materials and groove excavation methods that have made work as mechanical as possible have been developed.

There are various mechanized earth retaining methods, but as a typical one at present, columns are driven at regular intervals along both sides of the excavation groove, and the columns that are opposed to each other in the excavation groove can freely expand and contract. In this method, one panel is fitted between struts on the same side and is supported by an uncut beam, or in the above method, instead of a panel, a bellows member is horizontally provided between struts on the same side. , There is a method of arranging sheet piles along this. A typical construction method using the latter sheet pile is the construction method described in Japanese Patent Laid-Open No. 59-4723. However, when there is an obstacle such as a crossing pipe, this construction method should insert the sheet pile halfway only at that place. Since it is good, it is suitable for construction in urban areas.

FIG. 8 is a view showing a construction method described in Japanese Patent Laid-Open No. 59-4723. Narrow retaining panel 31 that will become a pillar
Are struck in opposite positions of the excavation ditch 30, and expandable and contractable beams 32 are provided at two upper and lower positions between the soil retaining panels 31 which are opposed to each other to maintain the distance between the soil retaining panels 31. On the other hand, a guide panel 33, which is a bellows raising material, is passed between the soil retaining panels 31 on the same side of the excavation groove 30, and a sheet pile 34 is built along the guide panel 33. When the length of the pipe 35 to be buried is longer than the distance between the grooves 30 of the cutting beam 32 in the longitudinal direction, the pipe 35 is slanted until it is inserted under the cutting beam 32, or when it is too long, the cutting is performed. The beam 32 was removed, but it is disclosed in JP-A-59-4.
Japanese Patent No. 723 also describes an improvement means for this. That is, as shown in FIG. 8, since the connecting portion of the cutting beam 32 to the soil retaining panel 31 has a structure that can be rotated by the pin 36, the cutting beam 32 can be rotated and temporarily retracted. Therefore, first, the upper cut beam is rotated and retracted, the pipe 35 is hung above the lower cut beam, the upper cut beam is returned, and then the lower cut beam is rotated and retracted to remove the groove. The pipe 35 is lowered step by step such that the pipe 35 is lowered to the bottom.

[0005]

As described above, Japanese Unexamined Patent Application Publication No.
In the construction method described in Japanese Patent Publication No. 9-4723, when the long pipe is laid, the cutting beam is rotated to be retracted.
In the construction in urban areas, the width of the excavation groove is often limited to the limit, and the thickness (diameter) of the cutting beam may be an obstacle. Also, in terms of cost, it is desirable that the width of the trench be as small as possible. Moreover, it is not efficient and dangerous for the operator to perform the retraction operation of the cutting beam inside the groove, and it becomes impossible to narrow the groove width unless the operator inserts it.

In order to solve the problem that the thickness of the cutting beam interferes, the cutting beam described in Japanese Patent Application No. 7-104596 and the drawings is effective. This is a telescopic beam 20 having two rotating shafts 25 and 26 which are orthogonal to each other as shown in FIG. That is, the girder 20
Is extendable by a water pressure jack 21 etc.
On the second side, a vertical rotation shaft 25 and a horizontal rotation shaft 26 orthogonal to the vertical rotation shaft 25 are provided between the support rod of the earth retaining structure and the hook plate 24 for attaching the cutting beam to the uprising member. Also, tip 2
On the 3rd side, there is a cross beam 20 on the strut or bellows facing each other.
It has a horizontal plate 27 for mounting.

As shown in FIG. 6, such a cutting beam 20 is provided between the column 10 and the column 10 facing each other, and / or
Alternatively, if it is attached between the bellows member 17 and the bellows member 17 facing each other, the sheet pile 18 built in the inner wall of the excavation groove
It is possible to construct a soil retaining structure that keeps the space between.

When it is necessary to evacuate the girder 20 attached to the column 10 or the like to suspend the pipe, the pressing force of the hydraulic jack 21 is first released in the state shown in FIG. As shown in (b), it is horizontally swung about a vertical rotary shaft 25 so as to be in a state substantially parallel to the belly member 17. Next, as shown in FIG. 7C, the horizontal rotary shaft 2
It is turned vertically around the center 6 and placed on the upper part of the belly material 17. As a result, the cutting beams 20 are used to support the columns 10 and
7, and the thickness of the cutting beam 20 does not hinder the work, so that the width of the excavation groove can be reduced accordingly.

However, Japanese Patent Application No. 7-104596 and the drawings also describe specific means for rotating and retracting the beam as described above without an operator entering the excavation trench. Not not.

Therefore, according to the present invention, when the cutting beam is to be retracted in the earth retaining structure of the excavation groove, the operator can work without entering the cutting beam, and the cutting beam is retracted to a position where the thickness of the cutting beam does not interfere. An object of the present invention is to provide a retraction operation method for a cutting beam and a retraction operation lever that can be used.

[0011]

According to the method of retracting a cutting beam of the present invention, a stretchable cutting beam having two orthogonal rotating shafts on the base end side is provided between columns facing each other and / or a bellows raising member. In the retreat operation method of the cutting beam in the earth retaining structure of the excavation groove installed between the two, the bifurcated member fixed to the lower end of the bar sandwiches the vicinity of the base end of the cutting beam from above, and the cutting beam is centered around the vertical rotation axis. Horizontally swivel to make it in a state substantially parallel to the bellows member, and within the range between the center of gravity of the beam and the base end, a bar piece rotatably and fixedly supported by a horizontal shaft on the lower end of the bar member. Insert it from below into the gap between the cut beam and the bellows, hook the tip of the bar piece to the top of the bar, and pull up the bar with the tip of the bar piece hooked, and cut the beam around the horizontal axis of rotation. Soil retention of excavation trench characterized by vertically turning and placing it above the bellows A retreating operation method Setsuhari in coercive structure.

Further, in the lever for retracting operation of the cutting beam of the present invention, an operating handle is provided at the upper end of the bar, a bifurcated member is fixedly provided at the lower end of the bar, and a bar piece is rotated at the lower end of the bar. A lever for retreating a cutting beam in a soil retaining support structure for an excavation groove, which is freely and fixedly supported by a horizontal shaft.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, an evacuation lever for a beam of the present invention is provided with an operating handle 3 at the upper end of a bar 2 and a bifurcated member 4 at the lower end of the bar 2. It is fixed. Although FIG. 1 shows an example in which the bar 2 and the forked member 4 are integrally formed of round steel or the like, the bar 2 and the operating handle 3 are made of a pipe, and the forked member 4 is a round member. It is also possible to manufacture it from steel and add it to the lower end of the bar 2 to fix it. The operator can horizontally rotate the cutting beam by sandwiching the cutting beam with the bifurcated member 4 from above the excavation groove and rotating the operating handle 3. Therefore, the shapes of the operating handle and the bifurcated member are not limited to those shown in the drawings.
Any shape may be used as long as it can be horizontally swung with the sash.

At the lower end of the bar member 2, a bar piece 5 is rotatably and fixedly supported by a horizontal shaft 6. Here, “rotatable and fixable” means that the rod piece 5 can be fixed at an arbitrary angle position with respect to the rod 2 only by its own weight, but if a force is applied, it can be rotated in the forward or reverse direction about the horizontal axis 6 or in a specific direction. It means that it is freely rotatable. This can be realized, for example, by inclining the inner diameter of the shaft hole of the horizontal shaft 6 in the axial direction and supporting the shaft by mounting a spring washer. Further, although not shown, a ratchet mechanism or the like can be adopted. FIG.
In the example shown in (1), the rod piece 5 is made of a member having a circular cross section such as round steel, but it may be made of a flat bar or the like. As will be described later, the rod piece 5 is used for turning the cutting beam in the vertical direction about the horizontal rotation axis and mounting it on the abdomen member.

The method of retracting a girder according to the present invention is a method of removing a girder.
At the stage, evacuate to the same plane as the columns and bellows.

The first stage is a stage in which a pressure beam released from a hydraulic jack, a hydraulic jack, an electric cylinder, etc. is horizontally swiveled so as to be in a state substantially parallel to the bellows raising member. This is as shown in FIG.
The forked member 20 is fixed to the lower end of the bar member 2 and the vicinity of the base end of the cut beam 20 is sandwiched from above, and the operation handle at the upper end of the bar member 2 is rotated so that the cut beam 20 is vertically rotated. It is horizontally swung to the center so as to be in a state substantially parallel to the belly-raising member 17 as shown in FIG. 2 (b).

The second step is a step of vertically turning a gantry in a state substantially parallel to the belly-raising member and placing it on the belly-raising member by vertically turning it about a horizontal axis of rotation. As shown in FIG. 3 (a), the rod piece 5 is inserted from below into the gap between the cut beam 20 in a state substantially parallel to the bellows member 17 and the bellow member 17, and then, as shown in FIG.
It is performed by pulling up the bar as shown in (b).

The second stage will be described in more detail with reference to FIG. 4 which is a sectional view of a portion of the operating lever. FIG. 4A shows a state in which the horizontal beam of the first stage has ended and the cutting beam 20 is in a state substantially parallel to the belly member 17. In this state, as shown in FIG. 4 (b), the bar piece 5 rotatably and fixedly supported by the horizontal shaft 6 on the lower end of the bar material 2 of the operating lever 1 is raised from the lower side with the cutting beam 20. Insert it in the gap with the material 17 and raise the tip of the bar piece 5
Hook above 7. The reason why the insertion position of the bar piece 5 is within the range between the center of gravity and the base end of the cutting beam 20 is that the entire cutting beam 20 cannot be lifted even if it is inserted and pulled up from the center of gravity to the tip side. is there. In this case, since only the self-weight is applied to the bar piece 5, the bar piece 5 is fixed to the horizontal shaft 6 at an angle that makes a square shape with respect to the bar material 2, and the bar girder 2 is attached from below.
It is possible to insert it in the gap between 0 and the bellows raising member 17. In addition, as shown in the figure, the tip portion of the rod piece 5 may be provided with a protrusion 7 so that it can be easily hooked on the upper side of the belly member 17.

Subsequently, as shown in FIG. 4 (c), the rod piece 5
Bar material 2 with the tip of the barb hooked to the upper side of the barging member 17
Is pulled up, and the girder 20 is vertically rotated about the horizontal rotary shaft 26. In this case, since the bar piece 5 is loaded with the weight of the cutting beam 20 in addition to its own weight, as the bar material 2 is pulled up, the bar piece 5 rotates and the angle between the bar material 2 and the bar material 2 greatly expands. It enables the traverse beam 20 to vertically rotate about the rotary shaft 26. Then, as shown in FIG. 4 (d), the cutting beam 20 is placed above the belly member 17, and the second step is completed.

When the work of hanging the pipe or the like is completed and the cut beam is to be installed again between the mutually facing columns and / or between the corrugated members, the cut beam may be moved in the opposite direction. First, the cutting beam is rotated from above the bellows member about a horizontal axis of rotation so as to be substantially parallel to the lateral side of the bellow member. This operation may be performed by pushing the beam into the groove with the lower end of the operating lever of the present invention. Next, sandwich the vicinity of the base end of the truss from above with a bifurcated member, and horizontally swivel around a vertical axis of rotation to attach the tip of the truss to an opposing strut or bellows, and apply a pressing force such as a hydraulic jack. Just hang it.

[0021]

According to the present invention, when the cutting beam in the earth retaining structure of the excavation ditch is retracted, the cutting beam is flush with the support column or the bellows member by an operation from the ground without the operator entering the ditch. It can be evacuated to the inside. Since it is not necessary for an operator to enter the trench and the thickness of the retracted girder does not interfere, the width of the excavation trench can be narrowed accordingly.

[Brief description of drawings]

FIG. 1 is a view showing an example of a lever for retreating operation of a beam of the present invention.

FIG. 2 is a diagram showing a horizontal turning step of the method of retracting a truss of the present invention.

FIG. 3 is a diagram showing a vertical turning step of the method for retracting a beam of the present invention.

FIG. 4 is a cross-sectional view of a portion of an operating lever showing a vertical turning step of the method for retracting and operating a beam of the present invention.

FIG. 5 is a diagram showing an example of a stretchable beam having two orthogonal rotating shafts on the base end side.

FIG. 6 is a diagram showing an example of a soil retaining structure using an expandable and retractable girder having two orthogonal rotation axes on the base end side.

FIG. 7 is a diagram showing a situation in which an expandable and contractable beam having two orthogonal rotation axes on the base end side is rotated and retracted.

FIG. 8 is a diagram showing an example of a conventional earth retaining support structure.

[Explanation of symbols]

 1 Operating Lever 2 Bar Material 3 Operating Handle 4 Bifurcated Member 5 Bar Piece 6 Horizontal Axis 7 Projection Part 10 Strut 14 Raising Supporting Material 17 Belly Raising Material 18 Sheet Pile 19 Joint Strut 20 Cutting Beam 21 Hydraulic Jack 22 Base End 23 Tip 24 Hook plate 25 Vertical rotating shaft 26 Horizontal rotating shaft 27 Horizontal plate 30 Excavation groove 31 Soil retaining panel 32 Cutting beam 33 Guide panel 34 Sheet pile 35 Pipe 36 pin

Front page continuation (72) Inventor Nobuaki Iida 1188-82, Oishimachi, Midori-ku, Chiba-shi, Chiba (72) Inventor Kuniyoshi Takahashi 2-3-6 Otemachi, Chiyoda-ku, Tokyo Shin Nippon Steel Co., Ltd. ( 72) Inventor Tsunehiko Hayashi 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Inventor Koji Yoshigai 2-3-6 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Co., Ltd. In-house (72) Inventor Minji Iimura 1-21-2 Reisen, Hodogaya-ku, Yokohama-shi, Kanagawa

Claims (2)

[Claims] 1. An evacuation of a cutting beam in an earth retaining structure of an excavation groove in which a stretchable cutting beam having two orthogonal rotating shafts on the base end side is installed between columns facing each other and / or between rising members. In the operation method, the vicinity of the base end of the cutting beam is sandwiched from above by a bifurcated member fixed to the lower end of the bar, and the cutting beam is horizontally swiveled about a vertical rotation axis to make it substantially parallel to the abdomen bar. Within the range between the center of gravity of the beam and the base end, a rod piece rotatably and fixedly attached to the lower end portion of the rod member by a horizontal shaft is inserted from below into the gap between the cutting beam and the bellow member and the rod is inserted. Hook the tip of the piece to the upper side of the bellows material, pull up the bar with the tip of the bar piece hooked, vertically rotate the cutting beam around the horizontal axis of rotation and place it above the bellows material. Method of retreating a girder in an earth retaining structure for excavation trenches characterized by. 2. An operating handle is provided at the upper end of the bar, a forked member is fixedly provided at the lower end of the bar, and a bar piece is rotatably and fixedly supported by a horizontal shaft at the lower end of the bar. A lever for retreat of a girder in a soil retaining structure for excavation trenches.