JPS5914513Y2 - Earth retaining device for excavated trenches - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to an earth retaining device used for excavating a trench for burying a main sewer 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 line is placed between them. A construction method in which the sheet piles are connected by a spindle and inserted vertically into the vertical guide spaces of each guide frame, and the soil between the sheet piles that protrudes downward from both guide frames is excavated to allow the sheet piles to settle while excavating a trench. The present applicant had previously proposed an earth retaining device for use therein (Japanese Patent Laid-Open No. 55-16172, Japanese Patent Application No. 53-892).
No. 31).

By the way, when excavating a trench using this type of construction method and equipment, there are various types of ground to excavate the trench from, such as soft sandy ground and hard clay ground. It is necessary to adjust the amount of penetration depending on the soil.

However, it is not easy to measure the amount of penetration of the sheet piles during work, and it is difficult to obtain the optimal amount of penetration depending on the ground.

The present invention was developed in view of the current situation, and its purpose is to provide an earth retaining device for trench excavation that can extremely easily set the amount of penetration of sheet piles into the ground to an optimum value according to the ground. There is something to do.

In this invention, as a means of optimizing the amount of penetration of the sheet pile into the ground depending on the ground, the bottom of the sheet pile is marked with a penetration gauge at least on the inner side, and the root cut and the guide gauge are displayed. A feature is that the amount of penetration is kept at an appropriate value based on the relationship.

Hereinafter, the present invention will be explained based on an illustrative embodiment.

In Figures 1 to 3, reference numeral 1 denotes a pair of sheet pile guide frames disposed opposite to each other on both sides of a trench A to be excavated, and both guide frames 1, 1 are controlled by a spindle 2 as a shear tensioner. Connected in direction.

Each guide frame 1 has an equal upper frame portion 1a and a lower frame portion 1b.
Both ends of both frame parts 1a and lb are integrally connected by vertical pipes 3, 3.

Both ends of the spindle 2 are appropriately connected to the pipe 3.

Each of the frame portions 1a, lb is formed so as to form a rectangular frame in plan view as a whole by the main cross member 42, the cross member 5, and the connecting arm 6 that connects them in the groove width direction.

The spaces between the main horizontal members 4 and the width horizontal members 5 of the upper and lower frame portions 1a and lb are aligned vertically, and these spaces allow the sheet piles P, which will be described in detail later, to be received and held in an upright state. A guide space 7 (FIG. 1) is formed.

The upper and lower frame portions 1a and 1b are also integrated by vertical connecting members 9 adjacent to the outside of the vertical pipe 3.

In the illustrated example, the connecting member 9 is made of C-shaped steel (channel steel with a lip), and the end portion of the main cross member 4 is fixed to the bottom wall of the connecting member 9 by welding or the like.

In the illustrated example, the main cross member 4 and the width cross member 5 are made of pipe material, and on the opposing sides of the main cross member 4 and the width cross member 5, there are additives that reinforce them and serve as guides for the sheet piles P. 10 and 11 are detachably attached.

The sheet pile group P, which is vertically inserted into the sheet pile guide space 7, is a series of double sheet piles whose longitudinal side ends are engaged with each other so as to be relatively slidable vertically, as shown in FIG. ) P,, P2. P3. It is composed of a combination of..., and at least the inner surface of this sheet pile P,
That is, on the surface located inside the groove A, a penetration guide gauge line 1 is provided at a position, for example, about 1 m above the lower end.

As shown in Fig. 2, this penetration guide gauge line 12 corresponds to the penetration depth of the sheet pile P into the ground when excavating a trench, and the corresponding penetration measurement when excavating soft ground. This is indicated by a gauge line 12, and when excavating hard ground, the optimum amount to incorporate is indicated by the gauge line 12.

Further, a plurality of gauge lines corresponding to various types of ground may be displayed simultaneously.

In addition, in FIG. 2 and FIG. 3, 13 is a protector mounted on the upper end edge of the sheet pile P when pushing the sheet pile P downward.

Next, a method of excavating a trench using the trench excavating earth retaining device described above will be described.

First, as shown in the longitudinal section in Figure 5, at the planned excavation location,
A groove A having a predetermined width and a depth that is approximately equal to the height of the guide frame 1, for example.
′ to be excavated.

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 A' as shown in the longitudinal section in the figure.

The distance between the outer surfaces of the guide frame 1.1 when lowered into the groove A' is made slightly smaller than the width of the groove A', and after lowering, the spindle 2 is extended by operating its turnbuckle 2a, and both guide frames 1 and 1 are brought into pressure contact with the groove wall surface.

In this state, the connected steel sheet piles P are inserted into the sheet pile guide spaces 7 of each guide frame 1 from above, and the lower ends are pushed into the soil somewhat as shown in the figure.

Further, in the trench excavation direction, a similar trench A' is dug in the same manner as above, and the newly assembled guide frames 1, 1 are sunk adjacent to the already sunk guide frames 1, 1, so that they are on the same trench wall surface. The flanges 14a, 14a of the connecting member 14 made of H-shaped steel are fitted into the grooves of the connecting fittings 9.9 of the guide frames 1, 1 arranged side by side, and both the guide frames 1, 1 are connected in the longitudinal direction of the groove. go.

The guide frame 1 fitted into the groove A' is connected to the opposing guide frame 1.
The guide frames 1, 1 adjacent to each other on the groove wall surfaces are connected by the connecting member 14 as described above.

Then, when the sheet pile P is inserted into the groove A' and excavation and removal is performed between the guide frames 1 and 1 facing each other, the earth is removed as shown in the vertical cross-sectional view in FIG. As the process progresses, the sheet pile P sinks while remaining upright 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 become the main sewer pipes, are lowered one by one to the bottom of the trench and connected sequentially in the longitudinal direction.

The installation tube is thus gradually extended.

By the way, when excavating this trench, the outer surface of the sheet pile P is covered with soil, so it is necessary to bury the lower end of the sheet pile P in the soil to ensure an appropriate depth of penetration, as shown in Figure 2. .

This amount of penetration needs to be adjusted as appropriate depending on the condition of the ground where the trench is to be excavated.

However, as mentioned above, with the conventional type, it is not easy to secure an appropriate amount of penetration depending on the ground condition.

Therefore, in this embodiment, a penetration guide gauge 12 is provided at a predetermined height position from the lower end of the sheet pile P, and an optimum penetration measurement is ensured using this penetration guide gauge 12 as a reference.

That is, the height position of the penetration guide gauge 12 from the lower end of the sheet pile P is set in accordance with the nature of the ground, and when excavating a trench, the trench is excavated to the position of the penetration guide gauge 12. This ensures the optimum amount of penetration depending on the soil.

For example, when excavating a trench in hard clay ground, the sheet pile P
Since the earth pressure applied to the sheet pile P is smaller than that of soft ground,
The amount of rooting can be reduced accordingly.

In this way, the amount of penetration differs depending on the ground, so it is possible to prepare sheet piles with gauges applied to each ground, but it is also possible to provide all the gauges for various ground on the same sheet pile. .

Alternatively, only a gauge for the softest ground may be provided, and the penetration amount corresponding to that gauge may be set as the maximum value, and this may be used as a guideline to obtain the optimum amount of heaping depending on the ground.

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 frames 1, 1 are extracted, and the groove A is sequentially backfilled.

The extracted guide frames 1, 1 and sheet piles P are used repeatedly as the trench A is dug again, 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 sink as the depth of the groove increases due to excavation, are connected to each other within one guide frame 1, but eventually Since both sheet pile elements P 1 + P 2 stand vertically and can be slidably displaced relative to each other, in the longitudinal direction, any of the sheet pile elements P 1 + P 2
+ P 3 +... is also in a state where it can settle independently.

On the other hand, at a depth of, for example, 1.5 m from the ground surface, there may be water supply or gas service pipes (none of which are shown) that intersect almost horizontally with the direction in which Trench A is being dug. .

These lead-in pipes inevitably prevent the sheet pile P from settling.

When you encounter such an obstacle that cannot be removed, move the sheet pile at that location.P., P2. P
3゜... is prevented from settling by an obstacle, and other sheet piles are falling) P 1. P2. P3.・・・・・・
Only ... is allowed to settle.

In this construction method, similar to the construction method described in JP-A No. 55-16172, when constructing the main body of the sewer to be buried at the deepest position, the sheet pile P is lowered to avoid various pipes located at intermediate depths. For safety, the sheet pile P used as an earth retaining wall is not forced into the trench, but is allowed to settle naturally as the depth of the trench increases. An earth retaining wall can be constructed using the sheet piles P by pushing them lightly through the protector 13.

In addition, when implementing this construction method, the lower spindle 2
If the pair of guide frames 1 and 1 are made to form an eight-figure shape by elongating the guide frame 1 more, the sheet pile P will also expand as it goes downward, and the sheet pile P will be deformed inward by the tonosho that increases as it goes downward. This can prevent the width of the bottom of the groove A from becoming narrower.

Therefore, the penetration guide gauge 12 is provided at a predetermined height position from the lower end of the sheet pile P on the lower inner surface side of the sheet pile P, and the penetration measurement is determined based on this penetration guide gauge 12.
You can easily obtain the optimum rooting depth according to the soil.

Note that any other display means other than lines may be used as the penetration gauge.

As explained above, in this invention, a penetration gauge is provided at the bottom of the sheet pile, and the depth of penetration of the sheet pile is determined based on this gauge. A large amount of penetration can be obtained very easily.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the earth retention device for trench excavation of the present invention, Fig. 2 is a view taken along line II-II in Fig. 1, Fig. 3 is a sectional view taken along line Ill-III in Fig. FIG. 4 is a perspective view of the sheet pile, and FIGS. 5 and 6 are explanatory diagrams showing the construction sequence using the earth retaining device of the present invention. 1... Sheet pile guide frame, 2... Spindle, 7... Sheet pile guide space, 12... Embedding guide gauge, P... Yaita, PI, P2.
P3. ... Sheet pile element, L ... Rooting amount.

Claims (1)

[Scope of utility model registration request] A plurality of sheet piles whose longitudinal side edges are slidably connected to each other, and a pair of guides that have a sheet pile guide space in the vertical direction for receiving and holding these sheet piles in an upright state and facing each other in the groove width direction. In a trench excavation earth retaining device having a frame and a spindle as a cutting tension provided between both guide frames so as to support both guide frames at both ends, there is a guideline for embedding the sheet piles at least on the inner surface side of the lower part of the sheet piles. An earth retaining device for excavation trenches characterized by being provided with a display that serves as a gauge.