JPH08277528A - Earth retaining work in excavated ditch and structure thereof - Google Patents

Abstract

PURPOSE: To avoid protrusions in an excavated ditch and prevent landslides of the inside walls, by rotating struts to retract it to a specified position of a waling, when the basal end of strut is supported by a post and a long pipe to be buried is hung down in an earth retaining structure. CONSTITUTION: A strut 3 with two rotary axses is turned to the upper face of a waling 4, while one end thereof is fitted to a post 1. In this case, a removable additional post 5 is joined on the upper end of the post 1 to prevent the post 1 from falling and an auxiliary strut 3A is detachably fixed between oppositely erected posts 5. One end of the strut 3 is supported by the post 1 through a rotary axsis crossing at right angles and the other end thereof is detachably fitted to the post 1 and the strut 3 is contained in the same plane with the post 1 and the waling 4. In this way, when a long size pipe is hung down to bury it in the ground, the width of the excavated ditch 30 is used to the utmost and the safety can be secured by fitting the auxiliary strut 3A.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a gas pipe, a water / sewer pipe,
The present invention relates to a soil retaining method for preventing landslides on the inner wall of an excavation trench when burying a pipe for laying electric wires and telephone cables.

[0002]

2. Description of the Related Art Most pipe laying work is performed by the open-cut method, but as a typical method that has been performed before, sheet piles are struck side by side on the both sides of the excavation groove, and the abdomen uplifting material is installed along this. There is a method of advancing the excavation while preventing the sheet pile from collapsing due to the earth pressure by supporting the abdominal members facing each other in the excavation groove with a crossbeam.
However, this method has a problem in ensuring safety because the worker must enter the groove and attach the abdomen upright and the girder. In order to solve such problems and further improve work efficiency, various earth retaining methods and earth retaining devices have been developed in which work is mechanized as much as possible.

There are various methods for the mechanized earth retaining method as described above, but as a typical one at present, stanchions (a narrow panel shape is also used at regular intervals along both sides of the excavation trench. There is a method of inserting a panel between the struts on the same side and supporting it with a jack between the struts facing each other in the excavation trench, or a belly between the struts on the same side instead of the panel in the above method. There is a method in which the raising members are provided horizontally and the sheet piles are arranged along them to stand up. A typical construction method using the latter sheet pile is Japanese Patent Laid-Open No. 59-4723. In this construction method, when there is an obstacle such as a crossing pipe, the sheet pile may be inserted halfway only at that location. Therefore, it is suitable for construction in urban areas.

FIG. 2 is a diagram showing the construction method disclosed in the above-mentioned Japanese Patent Laid-Open No. 59-4723, in which a narrow width soil retaining panel 3 to be a pillar.
1 is driven into the opposite positions of the excavation ditch 30, and jacks 32 are provided at two upper and lower positions between the soil retaining panels which are opposite to each other so as to maintain the interval therebetween. On the other hand, a guide panel 33 which is a bellows material is passed between the soil retaining panels on the same side of the excavation groove, and a sheet pile 34 is built along the guide panel 33. Further, when the length of the pipe 35 to be buried is longer than the gap in the lengthwise direction of the jack groove, in the past, the pipe was slanted and inserted under the jack from the end, or the jack was removed when it was too long. JP-A-59-4
In the construction method of Japanese Patent No. 723, improvement means for this is also shown. That is, as shown in FIG. 2, since the connecting portion of the jack to the soil retaining panel can be rotated by the pin 36, it can be temporarily retracted. Therefore, first evacuate the upper jack, hang it above the lower jack, return the upper jack, then evacuate the lower jack and lower it to the bottom of the groove. I will go.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method disclosed in Japanese Patent No. 723 employs a method of turning a jack when a long pipe is laid, but in construction in an urban area, the excavation width of a groove is often limited, and the width of the jack is also an obstacle. Sometimes. Also, in terms of cost, it is desirable to make the width of the trench as small as possible. There is no danger of the earth retaining panels or struts facing each other falling down if they are supported by jacks at the two upper and lower positions, but when one of the upper and lower jacks is removed when the pipe is suspended, they fall as a single point support. I have a concern. It is an object of the present invention to provide a soil retaining method for excavation trenches that solves the above problems.

[0006]

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and maintains the distance between the columns that are opposed to each other at regular intervals along the inner wall of the excavation trench and the columns that are opposed to each other. It was placed between the digging groove and the abdomen, and the expandable and retractable girder horizontally installed on the stanchion for this purpose In the earth retaining method, which is supported by a plurality of sheet piles, the base end of the girder is supported by a pillar via two rotating shafts orthogonal to each other, and the tip is detachable from the pillar, and a long pipe embedded in the earth retaining structure is attached. A method of retaining earth retaining in an excavation groove, characterized in that, during hoisting and lowering, a cutting beam is rotated around the two rotation axes that are orthogonal to each other and is retracted to a position along an upper surface or a lower surface of the wadding material. Further, here, the upper end of the pillar is formed into an L shape by a hooking piece extending to the outer side of the excavation groove, and the hooking piece is hooked on the edge of the excavation groove and embedded in the earth retaining structure. When the long pipe is hung down, in retracting the cutting beam, a supplementary cutting beam is added to the upper end of the supporting column to join the supporting columns and to hold an interval between the supporting columns facing each other. To do.

In addition, in the earth retaining structure for carrying out the earth retaining method, the pillar is a groove-shaped member with the flange side facing the inside of the excavation groove, and the upper end is hooked to the edge of the excavation groove. A portion is formed, one or more hooking plates are coupled to the mounting portion of the cutting beam of the strut parallel to the web in the groove of the channel member, and a hook plate is coupled to the base end of the cutting beam. By inserting a hook plate between the hooking plate and the web or between a plurality of hooking plates, and a horizontal plate is coupled to the tip and placed on the hooking plate, the cutting beam is supported by a column,
At the base end of the beam, it is orthogonal to the hook plate 2
Two rotary shafts are provided, and a flare support member having an L-shaped or U-shaped cross section is coupled to the flanges on both sides of the cut beam mounting portion of the column, and the cut beams are connected by the two rotary shafts. The earth retaining support structure for an excavation groove is characterized in that the base end can be rotated to a position along an upper surface or a lower surface of the bellows member with the base end attached to a pillar.

Further, in the cutting beam used for the earth retaining support method in the excavation trench, the hook plate is connected to the base end side of the cutting beam via two orthogonal rotating shafts, and the tip end side in the vertical direction. It is a girder characterized in that a horizontal plate for supporting is connected. Further, in the earth retaining structure of the excavation groove described above, the above-mentioned girder is further arranged in the middle portion between the pillars of the waving material and the pillar.

[0009]

In the earth retaining method for the excavation groove of the present invention, the columns are provided along the inner wall of the excavation groove so as to face each other at regular intervals. Then, the space between the columns is maintained by the expandable and retractable girders that are horizontally installed at two or more positions above and below the columns that face each other. Further, a bellows member is attached between the pillars on the same side of the excavation groove at the same position as the cutting beam, and earth retaining is performed by a plurality of sheet piles arranged between the excavation groove and the bellows member. By using a channel-shaped member, that is, channel-shaped steel or even a channel-shaped aluminum material for the column, the weight can be reduced as much as possible and the cost can be reduced by using a standard product. Further, the pillar is hooked and held by the edge of the excavation groove by a hooked portion having a curved upper end.

When the buried long pipe is hung on the earth retaining structure, the upper beam is first evacuated and hung above the lower beam, and the upper beam is returned to the lower beam. The pipe will be lowered in two steps, such as retracting the beam and lowering it to the bottom of the groove. One end of the beam is supported by the column via two orthogonal rotating shafts, and the other end is It can be rotated and retracted by making it removable from the pillar. By the method of rotating about these two rotation shafts, it is possible to retract to the position along the upper surface or the lower surface of the bellows raising member. In this way, since the girder can be stored in the same plane as the pillar and the bellows, the width of the excavation groove can be maximized when the long pipe buried in the earth retaining structure is suspended.

When the buried pipe is hung down and the upper and lower beams are retracted, the supporting column is supported only at one position in the upper and lower positions, which may cause instability and fall. This is not the case if there are three or more cutting beams on the upper and lower sides, but if there are no particularly deep excavation trenches, two points will be sufficient in terms of strength, and it is uneconomical to provide three or more points. Therefore, in order to evacuate the beams, it is possible to secure safety by connecting the columns by adding them to the upper ends of the columns and detachably installing auxiliary beams to keep the space between the columns facing each other. it can.

The cross beam having two orthogonal rotation axes according to the present invention can be provided not only between the opposing columns as described above, but also in the intermediate portion between the columns of the bellows raising member as required. . That is, when the span between the columns on the same side of the excavation groove is long, a cut beam is provided at an intermediate position to reinforce the strength of the bellows material. Can be evacuated.

[0013]

1 is a perspective view showing an earth retaining structure for excavation trenches according to the present invention. The column 1 is used with the flange side of the channel member facing the inside of the excavation groove 30. The upper part of the pillar is bent in an L shape to form a hook 2. The cross beams 3 are attached to the upper and lower portions of each of the columns, and the bellows members 4 are also attached at this position. Then, a sheet pile 34 is built between the bellows and the excavation groove.

FIG. 3 is a view showing the structure of the mounting portion of the strut 1 and the uprising member in the column 1. A hooking plate 11 parallel to the web 12 is welded into the groove of the groove-shaped member forming the support column, and a gap 13 is formed between the hook plate 11 and the web. A hook plate of a cross beam, which will be described later, is inserted into this gap, but not limited to the one shown in this example, a plurality of hook plates may be attached to form a gap therebetween. In this example, the horizontal base plate 16 covers the upper portion of the hooking plate 11, and such a base plate is not essential in the configuration of the present invention, but such changes can be appropriately made.

Also, in this portion of the support column, the bellows supporting member 1
4 is also welded, and both ends of the abdomen uplifter are placed and supported on this portion. In this example, a square steel pipe is used as the wadding material, but an H-shaped steel or the like is also suitable. Aluminum materials can also be used. In FIG. 3, the bellows support member has a shape similar to an L shape having a protrusion 14A, and widened to support earth pressure from the sheet pile applied to the bellows member on the centerline side of the excavation groove. There is. The abdominal support member is not limited to the shape shown in FIG. 3, but a U-shaped member having a deepened protrusion 14A or a member close thereto can be used. The portion 14B between the flanges on the front surface is not necessary for supporting the bellows member, but forms a box-shaped portion in the groove of the groove-shaped member together with the hooking plate 11 and forms a cut beam together with the hooking plate. Has the effect of supporting. In addition, in FIG.
Reference numeral 5 is a notch for retreating the cutting beam as described later, but this may not be provided in some cases.

A hydraulic jack 21 is provided on the cross beam 3 as shown in FIG. The jack may be bidirectionally operated, or may be unidirectionally operated with a return spring only in the extending direction. Further, not only a hydraulic jack but also a hydraulic jack can be used. Also, a so-called electric cylinder or the like having a similar function can be used. The base end of the jack has two rotating shafts 2 that rotate in the horizontal direction and the vertical direction, respectively, that is, orthogonal to each other.
5 and 26 are provided, and a column mounting member 22 having a hook plate 24 is further coupled via these rotary shafts. Therefore, this hook plate 24 is the hook plate 1 shown in FIG.
The girder can be attached to the column by inserting it between 1 and the web 12. On the other hand, the tip of the jack is a horizontal plate 27.
The column beam is supported by the column by attaching the column mounting member 23 having the above to the hanging plate 11 or the base plate 16.

The cutting beam is constructed by
With the rotating shaft of the book, it is possible to rotate to the upper surface of the wadding member with one end attached to the column. That is, FIG. 5 is a diagram for explaining the operation, and the beam is horizontally rotated from the position shown in FIG. 5A to the position shown in FIG. After that, it can be rotated about an axis parallel to the central axis of the traverse by the horizontal rotation shaft 26 and brought to a position along the uprising member of FIG. 1 and 3, the notch 15 is provided on the flange on one side of the channel steel, but this is to secure a space for the rotation of the above-mentioned beam. However, this notch is not indispensable in the present invention, and is unnecessary, for example, when the vertical beam 15 is located outside the flange of the column 1 when the beam is attached to the column.

The two rotary shafts are not limited to the configurations shown in FIGS. 4 and 5. For example, as shown in FIG. 6, two rotary shafts 28 and 29 that are orthogonal to each other in a horizontal plane are provided and rotated about the rotary shaft 28 parallel to the excavation trench,
Further, it may rotate around a rotation axis 29 orthogonal to the excavation groove. In addition, in the structure shown in FIGS. 4 and 6, the position of the rotary shaft may be changed so as to follow the lower side of the bellows member when the cut beam is retracted. In addition, in the above description, the rotation around the two rotation axes is described as rotating around one axis and then rotating around the other axis. It is also possible to perform them simultaneously.

The above-mentioned cross beam having two orthogonal rotation axes is also arranged in the middle portion between the columns of the bellows member 4 as shown by 3B in FIG. Plays a role of reinforcement when it is large. The above-described structure of the hook plate 24 and the horizontal plate 27 at both ends of the beam can be used as it is when it is attached to the bellows member, and can be retracted to a position along the bellows member by the rotating shaft.

In retracting the beams as described above, in order to prevent the columns from falling down, as shown in FIG. 1, a removable support column 5 is provided at the upper end of the support column 1 and the space between the opposing support columns is set. Attach the auxiliary cutting beam 3A to the. The additional support pillar 5 may be formed by welding the plate 6 so that the groove-shaped member of the support pillar 1 becomes a tubular shape, and inserting it into this. The attachment portion of the auxiliary cutting beam 3A may have a structure in which a hook plate parallel to the web is welded in the groove of the channel member as described above. Therefore, the cut beam 3A may have a hook plate connected to one end and a horizontal plate connected to the other end like the cut beam described above. However, the structure that rotates around the two orthogonal rotation axes described above is not particularly necessary. That is, it is not necessary to evacuate the auxiliary cutting girder because it is only necessary to add the pillars and attach them while suspending the buried pipe above the upper cutting girder.

[0021]

According to the earth retaining method in the excavation trench of the present invention, one end of the cutting beam is supported by the supporting column via two rotating shafts orthogonal to each other, and the other end is made detachable from the supporting beam. Since it can be stored in the same plane as the pillars and bellows, the width of the excavation groove can be maximized when suspending the long pipe buried in the earth retaining structure. Further, the safety can be ensured by adding the buried pipe to the upper end portion of the supporting column and connecting the supporting columns to each other, and by attaching an auxiliary cutting beam between the supporting columns facing each other. Further, since many standard products such as channel steel are used as the constituent members, a low cost and lightweight structure can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an earth retaining structure of the present invention.

FIG. 2 is a perspective view showing an example of a conventional earth retaining structure.

FIG. 3 is a view showing a part of the structure of a pillar in the earth retaining structure of the present invention.

FIG. 4 is a diagram showing an example of a girder in the earth retaining structure of the present invention.

5A to 5C are diagrams showing the retracting operation of the cross beam in FIG. 4, and FIGS. 5A to 5C show an operation sequence.

FIG. 6 is a partial view showing another example of the cross beam in the present invention.

[Explanation of symbols]

 1 Strut 2 Hooking Part 3, 3B Cut Beam 3A Auxiliary Cut Beam 4 Belly Raising Material 5 Additional Strut 6 Plate 11 Hooking Board 12 Web 13 Gap 14 Belly Raising Support Material 15 Cut 16 Base 21 Water Hydraulic Jack 22, 23 Strut Mounting member 24 Hook plate 25, 26, 28, 29 Rotating shaft 27 Horizontal plate 30 Excavation groove 34 Sheet pile 35 Pipe

Front page continuation (72) Inventor Tsunehiko Hayashi 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Inventor Koji Yoshigai 2-6-3 Otemachi, Chiyoda-ku, Tokyo Shin-Nihon (72) Inventor Setsuo Machida 6-11-206 Deki, Kawasaki-ku, Kawasaki-shi, Kanagawa (72) Inventor Noriaki Iida 1188-82 Oishi-cho, Midori-ku, Chiba-shi, Chiba

Claims (6)

[Claims] 1. A support pillar provided along the inner wall of the excavation groove so as to face each other at a constant interval, an extendable and retractable girder horizontally installed on the support pillar to maintain the distance between the opposing support pillars, and the excavation groove. In the earth retaining method, which is supported by the bellows attached between the columns on the same side at the same position as the cutting beam and a plurality of sheet piles arranged between the excavation groove and the bellows, the base end of the cutting beam Is supported by a column via two orthogonal rotating shafts, the tip of which is removable from the column, and when a long pipe embedded in an earth retaining structure is hung, a beam is placed around the two orthogonal rotating shafts. A method for retaining earth retaining in an excavation trench, which is rotated to a position along an upper surface or a lower surface of the bellows raising member. 2. The upper end of the pillar is formed into an L shape by a hooking piece extending to the outside of the excavation groove, and the hooking piece is hooked on the edge of the excavation groove and is also attached to the earth retaining structure. When the embedded long pipe is hung down, when the cut beam is retracted, a supplementary girder for connecting the support columns to the upper end of the support columns and connecting the support columns to each other and holding the interval between the support columns facing each other is connected. The earth retaining method for excavation trenches according to claim 1. 3. Posts provided along the inner wall of the excavation groove so as to face each other at regular intervals, expandable and retractable beams that are horizontally installed on the post to maintain the interval between the opposing posts, and the excavation groove. In the earth retaining structure constituted by the bellows member installed between the pillars on the same side at the same position as the cutting beam and the plurality of sheet piles arranged between the excavation groove and the bellows member, the pillar is a flange. A groove-shaped member having a side facing inward of the excavation groove, and a hooking portion for engaging with an edge portion of the excavation groove is formed at an upper end, and a groove portion of the groove-shaped member is attached to an attachment portion of the cutting beam of the strut. By connecting one or more hook plates in parallel with the web, and by connecting hook plates to the base end of the beam, the hook plates are inserted between the hook plate and the web or between the hook plates. , And the horizontal beam is connected to the tip, and the beam is attached by placing it on the hook plate. Two rotating shafts, which are supported by columns and are orthogonal to the hook plate at the base end of the truss, are provided, and the flanges on both sides of the truss mounting portion of the column have an L-shaped cross section. Alternatively, a U-shaped waving support member is coupled, and the cutting beam can be rotated by the two rotating shafts to a position along the upper surface or the lower surface of the waving material while the base end is attached to the column. An earth retaining structure for excavation trenches, which is characterized in that 4. The earth retaining structure for excavation trenches according to claim 3, wherein a reciprocating support pillar is provided at an upper end of the support pillar, and a truss is detachably attached between the reciprocating support pillars. 5. In a cutting beam used for a soil retaining method in an excavation trench, a hook plate is connected to a base end side of the cutting beam via two rotating shafts orthogonal to each other, and a tip end of the cutting beam is provided in a vertical direction. A girder characterized in that a horizontal plate for supporting is connected. 6. The earth retaining structure for excavation trenches according to claim 3, wherein the beam of claim 5 is further arranged at an intermediate portion between the columns of the bellows member. Earth retaining structure.