JPS58131227A - Sheathing device for excavating trench - Google Patents

Abstract

PURPOSE:To simplify the structure of a sheathing device by inserting the convexed tip receiver of a brace into the opening of a vertical pipe as a part of paired guide frames facing the widthwise direction of a trench having a sheet pile guiding space in such a way as to support both the guide frames. CONSTITUTION:A sheet pile guiding frame 1 having upper and lower frames 1a and 1b is connected with vertical pipes 3, and a sheet pile P is supported by the frames 1a and 1b made up of a main cross part 4, a subcross part 5, and a connecting arm 6. A brace 2 is inserted into the opening 22 of the pipe 3, a turn buckle 2a is turned, and a tip receiving metal 26 is pressed on the wall face of the pipe 3 to assemble the guide frames 1. The guide frames 11 are brought down into a trench of the same height as the guide frame 1 and pressingly contacted with the face of the trench by operating the turn buckle 2a, the trench is further digged down to A, and the sheet pile P is settled under its own weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earth retaining device mainly used for excavating a trench for burying a sewer main pipe or the like underground.

In order to prevent the noise and vibration that are problems with the conventional construction method of driving steel sheet piles for trench excavation, a pair of guide frames are placed on both sides of the excavated trench and a cut-off is created between them. are connected by a spindle, and the sheet pile is inserted vertically through the vertical guide space of each guide frame.

The present applicant had previously proposed a method of excavating a groove between the sheet piles that protrudes downward from both guide frames and digging a trench while allowing the sheet piles to settle, and an earth retaining device for use therein (Japanese Unexamined Patent Publication No. 55-1
No. 6172, Japanese Patent Application No. 89231/1983).

SUMMARY OF THE INVENTION An object of the present invention is to simplify the structure of the connection between the spindle and the guide frame in the above-mentioned known earth retaining device, and to provide an effective shearing action.

According to the present invention, a vertical pipe is used as a member constituting a part of each guide frame, an 11-inch opening facing the inside of the excavation groove is formed, and each end of the spindle has a convex arc-shaped end surface. The end receiver is provided with a tool, and the end receiver achieves the above purpose by inserting each end of the IB spindle into the interior of the longitudinal pipe through the opening so that the end face of the tool is received by the inner wall surface of the longitudinal pipe. achieved.

The present invention will be described in detail below with reference to one drawing.

In Figures 1 to 3, reference numeral 1 denotes a pair of sheet pile guide frames arranged oppositely on both sides of a trench A to be excavated, and these guide frames 1.1 are disclosed in Japanese Patent Application Laid-Open No. 55-16172. As in the case of the invention according to the above, the grooves are connected in the groove width direction by the spindle 2 as a cutting tension.

As shown in FIG. 4, each sheet pile guide frame 1 has an even upper frame portion 1.
a and a lower frame part 1b, and these upper and lower frame parts 1a,
Both ends of lb are integrally connected by a longitudinal pipe 3.3. Both frames 1m.

1b each has a main cross member 4. The sub-cross members 5 and the connecting arms 6 that connect them in the groove width direction form a rectangular frame in plan view as a whole. Upper and lower frame 1
A, lb main cross members 4 and secondary horizontal sheet pile guide spaces 7 (Fig. 1) are formed.

The sheet piles P inserted in the vertical direction into the sheet pile guide space 7 are a series of double sheet piles whose longitudinal side edges are engaged with each other so as to be relatively slidable vertically, as shown in FIG.
It is composed of a combination of PI, Pt-Ps,...

The upper and lower frame portions 1a and Ib are further integrated by a connecting fitting 9 adjacent to the outside of the vertical pipe 3. In the illustrated example, the connecting fitting 9 is made of C-shaped steel (channel steel with a lip), and the end of the cross member 4 is fixed to the bottom wall of the connecting fitting 9 by welding or the like. In the illustrated example, the main cross member 4 and the secondary cross member 5 are composed of pipes, and the opposing sides of the main cross member 4 and the secondary cross member 5 are supplemented with additives that not only reinforce them but also serve as guides for the sheet piles P. 10 and 11 are fixed respectively.

As is clear from FIG. 7, the additives 10 and 11 have an arcuate cross section. The additives 1o and 11 may be fixed by welding, but preferably by inserting bolts through the cross members 4 and 5, respectively. For this purpose, it is preferable to form holes as shown at 13, 14, and 15 in FIG.

As shown in FIG. 4, the connecting arm 6 includes a main member 6a and a reinforcing and sheet pile guiding additive 6b having a circular arc cross section.

The cover plate 6c is integrally fastened with bolts 16. In order to allow extension of the connecting arm 6, the main material 6& and the supplementary material 6b are separated at the middle. Therefore, as shown in FIG. 5, the main material 6a and the additive material 6b are separated at the middle part, and a spacer plate
7, insert the main material 6 using different holes in the punching plate 6c.
Fasten a and the backing plate 6C with the hole 6, and then tighten the backing plate 6C.
When the spacer plates 17 and 17 are bolted together through their holes 19, 20, the connecting arms 6 are extended.

As shown in FIG. 6, which is a view of the guide frame 1 viewed from the inside of the groove, openings 4 are formed at the top and bottom on the inner surface of each vertical pipe 3. These openings n have a vertically long rectangular shape in the illustrated embodiment. The end of the spindle 2 is inserted into the opening n as will be described later. A small hole B for inserting a bottle is provided directly below each opening n, and a small hole B is also provided in the pipe wall opposite thereto.

In FIGS. 9 and 10, the tip receiver attached to the end of the spindle 2 is shown. This tip holder has a shaft portion 2 with a hole n into which the waterfall portion of the spindle 2 is inserted.
6 m and an enlarged head 26b at the tip thereof, the enlarged head 26b has a vertical dimension larger than a lateral dimension, and its tip surface has a convex arc shape.

An elastic material 26c such as rubber is attached to the surface for cushioning. A tip holder is fixed to the end of the spindle 2 inserted into the hole 4 by inserting a bottle through the through hole.

Insert the end of the spindle 2 into the opening n, and
When the spindle is extended by rotating the turnbuckle 2a (Figs. 1 and 3), which forms part of the It is pressed against the opposing wall surface of the pipe 3 via the elastic material 26c. In addition, after inserting the tool, when the tip holder is inserted into the hole directly below the opening B and the pin hole facing it, the tip holder is prevented from descending by the pin I, and the 8th As shown in the figure, the center number ζ-axis portion 26m of the opening n is located. The vertical dimension of the tip of the tip holder is smaller than the vertical dimension of the opening n, so it is not possible to insert the tip of the tip holder into the opening B with the tip in its normal orientation. Therefore, as shown in Fig. 11, when the tip holder is partially inserted into the opening ρ with the tool facing diagonally downward, and then displaced in the direction shown by arrow passes through the opening.

The tip of the tip is then turned as shown by the imaginary line. Note that the tip receiver may be inserted with the tool facing diagonally upward.

The length of the guide frame 1 in the groove longitudinal direction is the length of the main cross member 4 and the sub cross member 5. For example, as shown in FIG.
It can be expanded by dividing it by 2 and 33. FIG. 12 shows an example of the stretching means for the main crosspiece 4. FIG.

In this example, at the position number of the dividing line support, a short pipe support with an outer diameter dimension that can freely slide on the inner surface of the cross member 4 is inserted into the inside of the cross member 4. Under normal conditions, the cross member 4 is a short pipe. It is fixed by a hole (pol) 35 that passes through them. In order to extend the cross member 4, the bolts are removed, the cross members 4 are separated at the parting line as shown in FIG. 13, and the bolts 35 are inserted into different holes in the short tube arms. The secondary cross member 5 can also be extended using the same principle.

In the embodiment described above, the main cross member 4 is formed thicker than the sub-cross member 5, but the sub-cross member 5 can also be formed thicker. In addition, in the right side of FIG. 2 and FIG. 3, 37 is a protector that is applied to the upper edge of the panel when pushing the sheet pile P downward.

Next, a construction method for excavating a trench using the trench excavation earth retaining device described above will be explained.

First, as shown in a longitudinal cross-sectional view in FIG. 15, a groove A' having a predetermined width and a depth approximately equal to the height of the guide frame is excavated at the planned excavation position. Meanwhile, on the ground.

The guide frames 1, 1 are connected by a total of four spindles 2, two each on the upper and lower sides, and are lowered into the groove as shown in the longitudinal sectional view in the figure. The distance between the outer surfaces of the guide frames 1, 1 when lowered into the groove R is made slightly smaller than the width of the groove, and after lowering, the spindle 2 is extended by operating the turnbuckle 2a, and both guide frames 1 are lowered. , 1 are brought into pressure contact with the groove wall surface. In this state, the connected steel sheet piles P are inserted from above into the sheet pile guide space 7 of each guide frame 1, and the lower ends are pushed into the soil somewhat as shown in the figure.

Further, in the trench excavation direction, a similar groove A' is dug in the same manner as described above, and the newly assembled guide frames 1, 1 are sunk adjacent to the already sunk guide frames 1, 1.

A flange 40 of a connecting member made of H-shaped steel is installed in the groove of the connecting fittings 9, 9 of the guide frames 1, 1 which are arranged along the same groove wall surface.
a and 40a are fitted to connect the two guide frames 1, 1 in the longitudinal direction of the groove.

The guide frame 1 fitted into the groove is connected to the opposing guide frame 1 via the spindle 2, but the guide frames 1, 1 adjacent to each other along the groove wall are connected by the above-mentioned arrangement. They are connected by a material 40.

Then, when the sheet pile P is inserted into the groove and the earth is excavated and removed between the opposing guide frames 1 and 1, the 16th
As shown in the longitudinal cross-sectional view in the figure, as the earth removal progresses, the sheet pile P remains upright and sinks due to its own weight and the auxiliary reduction blade.
Eventually, when the depth of the groove reaches a predetermined value and groove A is obtained,
Buried pipes such as Huyum pipes, which will serve as the main sewer pipes, are lowered to the bottom of the trench one by one and connected one by one.

The installation tube is gradually extended as described above.

After the buried pipe connected at the bottom of the groove A is connected to the adjacent one, the sheet pile P is extracted, the guide frame 1.1 is extracted, and the groove A is sequentially backfilled.

The extracted guide frames and sheet piles P are used repeatedly as the trench A is dug, so a large number of sets are not required.

The sheet piles P, which are inserted into the guide frame 1 as described above and then sink as the depth of the groove increases due to excavation, are connected to each other within one guide frame 1, but eventually are also upright so that they can slide freely relative to each other,
In the longitudinal direction, each sheet pile is in a state where it can sink independently.
There it is.

On the other hand, water supply or gas service pipes (not shown) may exist at a depth of, for example, 1.5 m from the ground surface, intersecting almost horizontally with the direction in which the trench is being dug. These lead-in pipes inevitably impede the settling of the sheet piles.

When such an obstacle that cannot be removed is encountered, the sheet pile at that position is prevented from settling by the obstacle, and only the other sheet piles are allowed to settle. In this construction method,
Same as the construction method described in the above-mentioned Japanese Utility Model Publication No. 55-16172.

When constructing sewerage mains buried at the deepest point, the sheet piles can be sunk to avoid various types of pipes located at intermediate depths, and the sheet piles that serve as earth retaining walls for safety are not forced into the ground. As the depth of #I increases, it will naturally settle, and even if it is necessary to apply external force, it is possible to construct an earth retaining wall using sheet piles by simply pushing it lightly through the protector with an excavator packet, etc. can. In addition, when implementing this construction method, if the lower spindle 2 is extended more so that the guide frames 1, 1 form a wing shape, the sheet pile P will also expand as it goes in the f direction and move downward. This prevents the sheet piles from deforming inward due to the increasing earth pressure and narrowing the width at the bottom of the trench.

The trench excavation earth retaining device according to the present invention used as described above has an opening in the vertical pipe of each guide frame,
The tip bone of the spindle end can be inserted into the opening by inserting a tool so that its convex arc-shaped end surface can be used inside the pipe. Since it can be freely angularly displaced by one degree relative to the wall surface, even if there is some degree of deviation in the position of the guide frame, the spindle will adjust to it and prevent the generation of undue stress.

Note that by making the dimensions of the upper and lower frame portions in the groove longitudinal direction and the groove width direction variable as in the embodiment.

The dimensions of the sheet pile guide space can be adapted to the dimensions of the sheet piles.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the earth retaining device for trench excavation of the present invention. Figure 2 is a view seen in the ■-I line direction of Figure 1, and Figure 3 is a view of Figure 1.
4 is a perspective view of the guide frame, FIG. 5 is a partial perspective view of the connecting arm of the guide frame when it is extended, and FIG. 6 is a front view of the guide frame as seen from inside the groove. Fig. 7 is an enlarged vertical sectional view of the guide frame, Fig. 8 is a diagram showing the relationship between the longitudinal pipe of the guide frame and the tip bone of the spindle, and Fig. 9 is a longitudinal sectional view of the tip bone of the tool. The figures are a plan view of the same, Figure 11 is a diagram showing the procedure for inserting the tip bone into the pipe opening, Figure 12 is a diagram showing the divided part of the guide frame cross member, and Figure 13 is a diagram showing the same in the extended state. , Fig. 14 is a perspective view of the sheet pile, Fig. 15
16 and 16 are explanatory diagrams showing the construction order using the earth retaining device of the present invention. P...Sheet pile-Pi, Pg, p,... Sheet pile element, 1... Guide frame, 2... Spindle, 3...
Vertical pipe, 4... Main horizontal member, 5... Sub-equipment, 6.
... Connecting arm, 6b... Additive, 6e... Backing plate, 7.
...Sheet pile guide space, 9...Connection fittings, 10, 11
...Additional material, 22...Opening, -23, 24...Small hole. ka... tip bone is tool, 26b... enlarged head, 26c...
...Elastic material. I... The distal bone is the tool support member (bishi), 32.33...
・Parting line, ah... short tube.

Claims (1)

[Scope of Claims] 1. A plurality of sheet piles whose longitudinal side edges are slidably connected to each other, and a groove facing in the width direction having a sheet pile guiding space in the vertical direction for receiving and holding these sheet piles in an upright state. It has a pair of guide frames that support both guide frames at both ends, and a spindle as a cutting tension between both guide frames so as to support both guide frames at both ends. An opening is formed on the side facing the vertical pipe, and a tip receiver having a convex arc-shaped end surface is provided at each end of the spindle, and the tip receiver is configured such that the end surface of the tool is received by the inner wall surface of the vertical pipe. An earth retaining device for trench excavation, characterized in that each end of the spindle is inserted into the vertical pipe through the opening. 2. Check the dimensions of the tip holder at each end of the spindle. 2. The earth retaining device for trench excavation according to claim 1, which is larger in one direction than the opening of the vertical pipe. 3. An earth retaining device for trench excavation according to claim 1 or 2, further comprising a member for supporting the tip support of the spindle from below immediately below the opening of the vertical pipe. 4. Claim 1 or 2, comprising means for varying the groove longitudinal dimension of the sheet pile guide space of each guide frame.
Earth retaining device for trench excavation as described in Section 1. 5. The earth retaining device for trench excavation according to claim 1 or 2, further comprising means for varying the dimension in the groove width direction of the sheet pile guide space of each guide frame.