JPH1121894A - Mobile type sheathing device, and construction of method avoiding underground obstacle by sheathing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost sheathing device and a construction method of avoiding underground obstacle by the sheathing device, which enable the safe and quick avoidance of obstacles and which are available even though the obstacles lie in deep positions. SOLUTION: A left and a right sheet pile unit 2 are coupled together by a coupling member 4, and a normal operation region W1 for connecting an embedded object W such as pipe is formed under the part behind between the sheet pile units 2, and it is made practicable to move within a groove V using an external driving means, etc. With this mobile type sheathing device 1, a removably mounted or a mobile aux. coupling member 5 is installed in a position under the part ahead between the units 2 and on the horizontal extension line of the region W1, and the normal operation region W1 and an avoid work region W2 leading to outside the forefront of the units 2 are formed in the part under ahead of the units 2 in between by moving the aux. coupling member 5 or any other similar means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile retaining device (hereinafter simply referred to as "retaining device") for protecting the side wall of an excavated trench when burying a buried object such as a pipe, and an underground obstacle caused by the retaining device. It relates to the method of avoiding objects.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 2-274918 discloses a soil retaining device in which a pair of left and right sheet pile units are connected by a connecting member and moves in a trench excavated by a power shovel or the like and an underground obstacle is prevented by the soil retaining device. It is described in the gazette. As shown in FIGS. 7A to 7C, this conventional earth retaining device forms a sheet pile unit 102 by connecting a movable sheet pile 101 on a fixed sheet pile 100, and furthermore, the movable sheet pile 1
The height of the sheet pile unit 102 can be changed by vertically moving 01 with the lifting means 103.

[0003] A method of avoiding an underground obstacle P (existing pipe or the like) using the earth retaining device is firstly described with reference to FIG.
As shown in (a), the movable sheet pile 101 is lowered in front of the underground obstacle P, and the trench V is dug in such a state without damaging the underground obstacle P, and the retaining device is advanced in the groove V. As shown in FIG. 7B, the movable sheet pile 101 is passed under the underground obstacle P, and the movable sheet pile 101 is passed after the soil retaining device completely passes under the underground obstacle P as shown in FIG. 7C. Raise it.

[0004]

However, in the above-described method of avoiding an underground obstacle using the conventional earth retaining device, the movable sheet pile 1 is required.
The section L from the position of FIG. 7 (a) where 01 is lowered to the position of FIG. 7 (c) where the movable sheet pile 101 is raised is a dangerous construction in which there is no soil in the upper half of the groove V. Therefore, this avoidance method is dangerous and cannot be used on the easily collapsed ground. Further, even if the height of the sheet pile unit 102 is reduced to the maximum, the conventional avoidance method cannot be used even when the underground obstacle P is lower than that.

On the other hand, in an earth retaining device having no means for avoiding an underground obstacle as described above (for example, Japanese Patent Publication No. 62-27234), the earth retaining device is to be raised just before the underground obstacle. However, at this time, since the tip of the buried object is in the center of the soil retaining device and cannot be connected any more, it is necessary to surround the soil retaining device with a sheet pile before lifting. Otherwise, when the earth retaining device is pulled up, the groove V may collapse and the buried object in the middle of connection may be buried. Therefore, conventionally, a large number of sheet piles have been erected in front of an underground object to make a reaching pit large enough for the earth retaining device. Of course, creating a pit every time avoiding underground obstacles would not only drastically reduce the benefits of using earth retaining equipment, but also avoiding underground obstacles in construction work in urban areas with many underground obstacles The time loss required to perform the operation becomes prominent, so that the conventional earth retaining device cannot be used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and its object is to firstly avoid an underground obstacle safely and in a short time, and secondly, to make it possible to avoid an underground obstacle at a deep position. Thirdly, it is an object of the present invention to provide a low-cost soil retaining device and a method for avoiding underground obstacles by the soil retaining device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a conventional method for connecting left and right sheet pile units with a connecting member and connecting an embedded object such as a pipe to a lower rear portion between the sheet pile units. In a retaining device which forms a work area and is further moved in a groove by an external driving means or a self-propelled means, the detachable or movable part is mounted on a horizontal extension of the normal work area at a lower front portion between sheet pile units. A free auxiliary connecting member is provided, and by removing or moving the auxiliary connecting member, the normal work area and the avoidance work area communicating with the outside of the tip of the sheet pile unit are formed in the lower front part between the sheet pile units. Provide earth retaining equipment.

By using the earth retaining device, the following method of avoiding an underground obstacle can be realized. Excavate a trench for a buried object using a power shovel or the like so as to cross an underground obstacle. An auxiliary connecting member is attached between the sheet pile units, and the earth retaining device is moved in the groove while the work of connecting the buried object in the normal work area is stopped just before the underground obstacle. The earth pressure acting on the sheet pile unit is greatest at the time of movement and on the front side. However, if an auxiliary connecting member is attached to the lower front part between the sheet pile units, it can sufficiently withstand a large earth pressure. In the stopped state, the auxiliary connecting member is removed or moved from between the sheet pile units to open the avoidance work area of the earth retaining device. Since the earth pressure acting on the sheet pile unit is extremely small in the stopped state in many cases, there is no problem in strength even if the auxiliary connecting member is removed. The next buried object is joined to the buried object in the normal work area so that the buried object finally passes through the avoidance work area. Dig a ditch long enough to hold the retaining device behind an underground obstacle. The retaining device is pulled out of the trench, over the underground obstacle, and lowered into the previously dug trench. The avoidance work area is closed by returning the auxiliary connecting member to the lower front part of the earth retaining device. The buried objects are connected using the normal work area, and the retaining device is advanced while digging a trench.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view of the soil retaining device, FIGS. 2A to 2C are side views of the soil retaining device, and FIGS. 3 to 8 are cross-sectional views illustrating methods 1 and 2 for avoiding an underground obstacle. .

The earth retaining device 1 comprises left and right sheet pile units 2,
It is roughly composed of an earth retaining plate 3 for closing the upper half of the rear surface, a connecting member 4 for connecting the two sheet pile units 2 and an auxiliary connecting member 5. The earth retaining device 1 of the embodiment is of a moving type of towing by an external driving means represented by a power shovel, and a towing part 6 for that purpose is provided substantially at the center of the both sheet pile units 2 or at the connecting member 4.

Each sheet pile unit 2 has a flash panel structure in which a steel frame is sandwiched between two steel plates, and has a so-called bow shape with an oblique tip. The connecting members 4 for stopping the sheet pile units 2 are steel square members, and are fixed to the upper part of the sheet pile unit 2 and four places in front and behind the center. The earth retaining device 1 has a normal work area W1 at a lower rear portion between the sheet pile units 2, and performs an operation of connecting an embedded object X such as a pipe in the normal work area W1.

In the earth retaining device 1 of the present invention, the detachable or movable auxiliary connecting member 5 is disposed at the lower front part between the sheet pile units 2 and on the horizontal extension of the normal work area W1. By removing or moving the connecting member 5, the normal work area W1 and the avoidance work area W2 communicating with the outside of the tip of the sheet pile unit 2 are formed in the lower front part between the sheet pile units 2.

The auxiliary connecting member 5 is, for example, first shown in FIG.
As shown in (a), one end is pivotally attached to the inner side surface of the sheet pile unit 2 with the pin 7 and the other end is locked to the other sheet pile unit 2, and the pin 7 is turned around the pin 7 as shown by the dashed line in FIG. 2 to open the avoidance work area W2.
(B) as shown in (b), mounted vertically movably along the vertical rails 8 provided on the sheet pile unit 2, and lifted up as shown by a dashed line in FIG. Third, as shown in FIG. 2 (c), the work 9 is attached to the sheet pile unit 2 with bolts 9, and the bolt 9 is removed and completely removed from the sheet pile unit 2 as indicated by a dashed line in FIG. Although not shown in the figure, a configuration in which the auxiliary connecting member 5 swings in a swing manner and jumps up can be selected (of course, other configurations are also possible). .

The auxiliary connecting member 5 has a fixed length structure formed of a single steel material and a variable length structure formed by connecting two or more steel materials so as to be expandable and contractible. The auxiliary connecting member 5 having a fixed length structure has an advantage that the structure is simple and the cost can be reduced.
In addition, the auxiliary connecting member 5 having a variable length structure can reduce the length to reduce or cancel the earth pressure when the earth pressure acts and it is difficult to remove and move, thereby simplifying the removal and movement. There are advantages that can be done. The means for changing the length of the auxiliary connecting member 5 having a variable length structure includes, for example, a screw jack structure and a structure using a hydraulic or pneumatic telescopic cylinder.

[0015]

[Avoidance Method 1] Next, an avoidance method 1 of the underground obstacle P using the earth retaining device 1 will be described with reference to FIGS. First, in a place where there is no underground obstacle P such as a pipe, the earth retaining device 1 is installed in a groove V for a buried object that is excavated using a power shovel or the like, and the buried object X is put in the normal work area W1.
Connect the buried object X to the end of the previously buried object X,
At the same time, the operation of digging the groove V in front of the retaining device 1, pulling the retaining device 1 forward with a power shovel, and backfilling the retaining device 1 is repeated.

Next, when there is an underground obstacle P such as a pipe in front of the course, the earth retaining device 1 is stopped immediately before the underground obstacle P as shown in FIG. At this time, the trench V has been dug up to a position beyond the underground obstacle P, and the underground obstacle P is exposed while crossing the trench V. Next, the auxiliary connecting member 5 is removed or moved from between the sheet pile units 2 of the earth retaining device 1 that has been stopped to open the avoidance work area W2. In the stopped state, since the earth pressure applied to the sheet pile unit 2 is small, there is no problem in safety even if the support by the auxiliary connecting member 5 is removed as described above. In addition, in the sense of being thorough according to the situation of the site,
A guide member 10 for a pile may be provided on the inner surface of the sheet pile unit 2 as indicated by a two-dot chain line. Then, the stake 11 is passed through the guide member 10 as necessary, and the stake 11 is
After taking measures against earth pressure by driving into the bottom of
If you remove, higher security can be secured.

Next, the embedded object X in the normal work area W1
Then, the next buried object X is connected so that the tip of the buried object X finally penetrates the avoidance work area W2 as shown in FIG. on the other hand,
In parallel with these operations, a groove V long enough to receive the earth retaining device 1 is dug behind the underground obstacle P. At this time, if the groove V is too deep and there is a risk of collapse, the depth is set to a depth such that the earth retaining device 1 is half-buried or shallower than that.

Next, the earth retaining device 1 using a crane or the like.
Is lifted up and lowered into the previously dug groove V over the underground obstacle P as shown by the dashed line in FIG. When the depth of the groove V is reduced as described above, the soil retaining device 1 is lowered to a target depth while digging the inside of the soil retaining device 1 with a power shovel or the like and breaking the bottom. Then, since the front end of the embedded object X buried first faces the rear end of the earth retaining device 1, the next embedded object X is connected to the embedded object X as shown in FIG. Thereafter, the retaining device 1 is advanced while connecting and burying the buried object X in the above-described manner.

When the underground obstacle P is located at a position where it obstructs the path of the buried object X, the groove V is gently deepened to allow the buried object X to pass under the underground obstacle P. An auxiliary panel (not shown) for retaining formed separately at the upper end of the sheet pile unit 2 may be added to increase the height of the sheet pile unit 2.

[0020]

[Avoidance Method 2] Next, a method 2 for avoiding an underground obstacle P using the earth retaining device 1 will be described with reference to FIGS. This avoidance method 2 is applied when only a shallow short groove V can be dug in front of the earth retaining device 1 due to restrictions such as the condition of the ground and safety standards for construction. First, when there is an underground obstacle P such as a pipe in the front of the course, the retaining device 1 is stopped immediately before the underground obstacle P as shown in FIG. At this time, the groove V is underground obstacle P
Not exceeded. In this state, the underground obstacle P as shown in FIG.
The steel sheet pile 12 is driven before and after. Of course, the sheet pile 12 may be driven in before the soil retaining device 1 reaches. Next, the soil surrounded by the sheet pile 12 is dug by a power shovel or the like to expose the underground obstacle P.
In parallel with this work, the auxiliary connecting member 5 is detached or moved from between the sheet pile units 2 of the earth retaining device 1 so as to avoid the work area W
Release 2 Then, the embedded object X is connected to pass through the avoidance work area W2 so that the tip of the embedded object X reaches the area sandwiched by the sheet piles 12. On the other hand, a groove V which is deep enough to half the earth retaining device 1 is buried behind the sheet pile 12 or shallower than that.
Dig.

Next, the earth retaining device 1 using a crane or the like.
Hoist. At this time, the sand is gradually raised while the sand is put into the earth retaining device 1. Then, the lifted soil retaining device 1 is lowered into the previously dug groove V, and is lowered to a target depth while digging into the soil retaining device 1 and breaking down the bottom. Then, since the rear end of the earth retaining device 1 communicates with the groove V surrounded by the sheet pile 12, the next buried object X is connected, and the groove V of the sheet pile 12 portion is connected.
Is backfilled and the sheet pile 12 is pulled out. Subsequent steps are the same as in the first avoidance method. In this avoidance method 2, the sheet pile 12 is used, but the number thereof is extremely small as compared with the conventional method.

Although the present invention has been described with reference to the embodiment, it is needless to say that the present invention is not limited to the above embodiment. For example, in the embodiment, the number of the auxiliary connection member 5 is one, but a plurality of the auxiliary connection members 5 may be used. Although the embodiment has been described with reference to the application example to the moving type retaining device 1 towed by a power shovel or the like, the present invention can be similarly applied to a self-propelled retaining device provided with propulsion means. Such a self-propelled earth retaining device is disclosed in, for example, the above-mentioned Japanese Patent Laid-Open No. 2-2.
No. 74918 and Japanese Patent Publication No. 62-27234, which divide the sheet pile unit in the front-rear direction.
The sheet pile unit is expanded and contracted by its own propulsion means (for example, a propulsion jack), and is moved forward and backward alternately in the manner of peristaltic movement. The Japanese Patent Publication No. 62-27234 discloses a structure in which left and right sheet pile units are connected to each other with a width increasing / decreasing jack and the earth pressure is adjusted by increasing or decreasing the width between sheet pile units. Also includes such a width increasing / decreasing jack.

The left and right sheet pile units 2 of the embodiment have a single-piece structure. However, as shown in FIG. None, the earth retaining device 1 may be divided into front and rear. By doing so, only the rear half 1R having the normal work area W1 is moved first in the state of FIG.
The latter half 1R in parallel with the work performed in the avoidance work area W2 of F
Can be installed behind the underground obstacle P, and subsequently, the first half 1F can be moved in parallel with the work performed in the second half 1R, so that the loss time for avoiding the underground obstacle P is reduced. Can be reduced to a minimum. Further, if the earth retaining device 1 is divided into the first half 1F and the second half 1R and moved separately, it is possible to lift even with a small crane or the like. Not only increase but also the cost required for the construction can be greatly reduced. Note that the same effect can be obtained even when the earth retaining device 1 is configured to be vertically split and moved separately.

[0024]

As described above, the earth retaining device according to the present invention has the auxiliary connecting member which is detachable or movable on the lower front portion between the sheet pile units and on the horizontal extension of the normal working area. By taking measures to remove or move the work to form the avoidance work area, the avoidance work area is formed as needed in the lower front part between the sheet pile units while having strength enough to withstand the earth pressure during movement. be able to. If the method for avoiding underground obstacles according to the present invention is carried out using the earth retaining device, it is not necessary to work in a dangerous place without earth retaining even when avoiding an underground obstacle. Since it does not pass under the middle obstacle, it can be used even when the underground obstacle is at a deep position, and furthermore, it has excellent effects such as simple construction of the earth retaining device and little additional cost.

Conventionally, in the work of burying a buried object, the advantage of using the earth retaining device as compared with the classical method of driving a sheet pile is well recognized by those skilled in the art. Due to the bottleneck, the earth retaining device is hardly used for construction work in urban areas. However, with the development of the retaining device of the present invention and a method of avoiding underground obstacles by using the retaining device, it is possible to use the retaining device even in an urban area where there are many underground obstacles. The construction period of burial work can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a retaining device.

FIGS. 2A to 2C are side views of the earth retaining device.

FIG. 3 is a cross-sectional view illustrating a method 1 for avoiding an underground obstacle.

FIG. 4 is a cross-sectional view illustrating an underground obstacle avoidance method 1.

FIG. 5 is a cross-sectional view illustrating an underground obstacle avoidance method 1.

FIG. 6 is a cross-sectional view illustrating a method 2 for avoiding an underground obstacle.

FIG. 7 is a cross-sectional view illustrating an underground obstacle avoidance method 2.

FIG. 8 is a cross-sectional view illustrating a method 2 for avoiding an underground obstacle.

FIG. 9 is a cross-sectional view of an avoidance method according to another embodiment.

FIGS. 10A to 10C are cross-sectional views illustrating a conventional avoidance method.

[Explanation of symbols]

 P ... underground obstacle X ... buried object W1 ... normal work area W2 ... avoidance work area V ... groove 1 ... movable earth retaining device 2 ... sheet pile unit 4 ... connecting member 5 ... auxiliary connecting member

Claims (2)

[Claims] An ordinary working area for connecting left and right sheet pile units with a connecting member and connecting a buried object such as a pipe to a lower rear portion between the sheet pile units, and further using external driving means or self-propelling. A movable earth retaining device adapted to move in a groove by means, wherein a detachable or movable auxiliary connecting member is disposed at a lower front part between sheet pile units and on a horizontal extension line of the normal working area, and the auxiliary connecting member is provided. A movable earth retaining device wherein a normal work area and an avoidance work area communicating with the outside of the tip of the sheet pile unit are formed in a lower front part between sheet pile units by removing or moving a member. 2. A method of avoiding underground obstacles by using a mobile earth retaining device, comprising using the mobile earth retaining device according to claim 1 and satisfying the following requirements. Excavate a trench for a buried object using a power shovel or the like so as to cross an underground obstacle. With the auxiliary connecting member attached between the sheet pile units, the movable earth retaining device is moved in the groove and stopped just before the underground obstacle. In the stopped state, the auxiliary connecting member is removed or moved from between the sheet pile units to open the avoidance work area of the movable earth retaining device. The next buried object is joined to the buried object in the normal work area so that the buried object finally passes through the avoidance work area. Dig a ditch long enough to accommodate a mobile retaining device behind an underground obstacle. The mobile earth retaining device is pulled out of the ditch, over the underground obstacle, and lowered into the previously dug ditch. The avoidance work area is closed by returning the auxiliary connecting member to the lower front part of the movable earth retaining device. The buried objects are connected using the normal work area, and the mobile retaining device is advanced while further digging a trench.