JPS5835733Y2 - Composite lightweight sheet pile for vibration isolation - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration-proof composite lightweight sheet pile that can bottom out and prevent floating.

Traffic vibrations generated by trains, automobiles, etc., and mechanical vibrations generated by factories, etc., are major causes of pollution along with noise, and they not only directly damage the living environment but also have a negative impact on adjacent buildings.

For this reason, various ground vibration isolation methods have been developed.
For example, a method of digging trenches is known.

Although the hollow grooves exhibit a considerable vibration reduction effect, they are difficult to maintain over a long period of time, and are therefore unsuitable as permanent structures.

Therefore, vibration isolation walls are formed by filling the hollow grooves with porous materials such as urethane foam and polystyrene foam, sandbags, or concrete.

Among these fillers, porous bodies exhibit the best vibration-proofing effect because their properties are similar to those of hollow grooves.

Conventionally, in order to bury this porous material underground, as shown in Fig. 1, earth retaining sheet piles 2 are driven into the ground 1, the area surrounded by the earth retaining sheet piles 2 is excavated, and then the porous material is filled inside. The method is to erect the shaking walls 3, etc., then backfill around the vibration isolation walls 3, and pull out the retaining sheet piles 2.

In this method, construction work such as driving and pulling out the retaining sheet pile 2, digging back and backfilling the area surrounded by the retaining sheet pile is complicated, and the excavation depth is also limited by the excavation machine.

Furthermore, vibration-proof walls are mainly needed in residential areas, where private houses are often densely packed, so it is better to shorten the construction period as much as possible. There are various problems such as the need to cover a wide area.

To solve this problem, it is possible to form a shell of steel sheet piles, etc., use a composite sheet pile that is filled with a porous anti-vibration material inside the shell, and then drive the sheet pile directly into the ground. do it.

However, since this composite sheet pile is filled with a porous material inside, there is a risk that it will easily buckle if it receives unexpected ground resistance when it is driven by directly striking the head of the sheet pile.

In order to avoid this, it is possible to adopt the bottom-pounding method, but the conventional bottom-pounding method is mainly aimed at preventing noise, and involves inserting a hammer or weight into the inside of the steel pipe to directly strike the bottom of the pile from inside. However, since the method is to prevent the impact sound from being diffused to the outside, this bottoming method cannot be used as is for the composite sheet pile.

Furthermore, since the composite sheet pile is filled with a porous vibration-proofing material, even if it can be cast, the specific gravity of the composite sheet pile is small, so if it is left as it is, the composite sheet pile will fall to the ground surface due to the buoyancy of groundwater in the ground. There is a problem with it floating.

The present invention prevents such composite sheet piles from floating and at the same time allows them to be bottomed out using a driving jig. A main body part filled with a vibration-proofing member made of a porous material, and a tip part integral with the main body part, and the tip part has an overhanging part to prevent floating and to which a driving jig for bottoming is applied. It is characterized by having a tapered surface.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in the drawings.

The basic structure of the composite sheet pile 50 according to the present invention is, as shown in FIG. 2, in which a vibration isolating material 20 made of a porous synthetic resin material such as styrofoam is filled inside a shell 21 made of a steel sheet pile or the like. , a rigid tip 22 is provided at its lower end.

The shell body 21 is a part that maintains the rigidity of the composite sheet pile body,
It is formed from sheet piles, such as steel sheet piles, lightweight steel sheet piles, concrete sheet piles, and deck plates.

The porous body used as the vibration isolating material 20 is optimally one having closed cells inside, and for example, a synthetic resin foam such as urethane foam, polystyrene foam, polyvinyl chloride foam, etc. may be used.

Due to the internal closed cells, the vibration isolating material is in a state similar to that of an empty groove, so a great vibration prevention effect can be obtained.

Furthermore, when synthetic resin foams such as expanded polystyrene are used, they have the advantage of having extremely low specific gravity and good waterproof properties.

Therefore, it is easy to transport the composite sheet pile 50 and install it during driving, and even when it is buried underground, there is no risk of groundwater, rain ice, etc. infiltrating into the bubbles, and a stable vibration-proofing effect can be achieved for a long period of time. keep.

To manufacture the main body of the composite sheet pile, as shown in FIG. It can be manufactured extremely easily if it is shaped so that it can be inserted from both sides.

When the composite sheet pile 50 is driven into the ground, the composite sheet pile 50 is compressed by the surrounding soil and receives earth pressure, so the sheet piles on both sides are maintained in a sufficiently joined state even if they are not tightened with bolts or the like in advance. be able to.

A tip portion 22 is integrally provided in the main body portion filled with the vibration isolating material 20.

When the bottoming method is adopted, the tip portion 22 will be a portion directly subjected to impact force, so it is formed of a rigid member so as not to be easily deformed.

For example, the outer shape may be made of a steel plate, the inside may be filled with concrete, or reinforcing ribs may be provided.

Regarding the weight of the tip, the heavier the tip 22 is, the easier it is to drive, except for the inconvenience during transportation.

This tip 22 is tapered to make driving easier.

For example, the tip portion 22 is formed into a triangular prism or pyramid, and is integrally joined to the sheet pile body portion by bolting or welding so that the tapered surface 28 faces downward.

Next, the distal end portion 22 is provided with an overhanging portion 26 that protrudes outward from the main body portion following the tapered surface 28.

The projecting portion 26 serves two roles.

One of them is a function to prevent floating due to digging into the ground.
Next, it functions as a protrusion to which a driving jig for bottoming is applied.

Even after the main body part is driven into the ground, as mentioned above, since the specific gravity of the porous body is small, the composite sheet pile 50 will gradually float due to unexpectedly large buoyancy caused by underground water.

However, when the overhanging portion 26 is provided, the ground bites into the four parts of the overhanging portion 26 due to its shearing force, which provides a large resistance to uplift and effectively prevents the composite sheet pile 50 from uplifting.

The overhanging portion 26 then allows for a bottom-drilling method using a driving jig.

The driving jig may be anything that extends from the projecting portion 26 to above the head of the main body, and for example, a guide sheet pile 60 shown in FIG. 5 may be used.

As shown in the figure, the guide sheet pile 60 is provided with a steel plate 61 surrounding the outer periphery of the composite sheet pile mark, and a flat portion 62 at its upper end that receives a blow from a diesel hammer or a weight 42.

A reinforcing rib 63 is provided on the steel plate 61 along the longitudinal direction.

Note that it is preferable to provide side plates 27 on both side edges of the overhanging portion 26 in order to prevent the guide sheet pile 60 from coming off the overhanging portion 26 to the left and right as driving progresses.

Furthermore, if the side plate 27 is provided with a slot I in the longitudinal direction of the sheet pile, and the reinforcing rib 63 of the guide sheet pile 60 is inserted, it is possible to prevent the guide sheet pile 60 from shifting in the front-rear direction.

Next, when driving the composite sheet pile 50 using the guide sheet pile 60, as shown in FIG.
The composite sheet pile 50 is attached below the diesel hammer or weight 42 of No. 1, and the composite sheet pile 50 is lifted by the rope of the pile driver 41 and inserted inside the guide sheet pile 60 (FIG. 7).

Next, the deisel hammer or weight 42 is activated to strike the head of the guide sheet pile 60, and this striking force is directly transmitted to the tip end 22 of the composite sheet pile 50 via the guide sheet pile 60, and the composite sheet pile 50 is moved to a predetermined depth. (Fig. 8).

Next, after driving the composite sheet pile 50 to a predetermined depth, the tizer hammer or weight 42 is pulled up, the guide sheet pile 60 is pulled out from the ground, and the next operation is started (FIG. 9).

This construction work is repeated and the composite sheet piles 50 are sequentially arranged to construct a driving vibration isolation wall.

In addition, it is preferable to provide joints on both side edges of the composite sheet pile to join the composite sheet piles to each other.

The joint is shaped to engage with the joint of an adjacent composite sheet pile in the ground at the same time as the composite sheet pile is driven, and is formed to protrude laterally from the tip.

As explained above, if the composite sheet pile according to the present invention is used, it can be driven without buckling the main body part, and it is economical, such as saving the time and labor of digging trenches and building it as in the past, and shortening the construction period. The benefits are great.

Furthermore, in the past, concrete was poured on the side or top surface or soil was piled up on the top surface to prevent floating after pouring, but with the composite sheet pile of the present invention, such work is not necessary and the above-mentioned This has the advantage that the overhanging portion itself acts as a resistance to floating.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an example of construction using conventional earth retaining sheet piles;
Fig. 2 is an external perspective view of the composite sheet pile according to the present invention, Fig. 3 is a partial view of the tip of the composite sheet pile according to the present invention, and Fig. 4 is an external perspective view of the main body portion composed of sheet piles with wedge-shaped projections. figure,
FIG. 5 is an external perspective view of the guide sheet pile, and FIGS. 6 to 9 are explanatory views showing the driving procedure using the guide sheet pile. In the drawings, 1 is the ground, 2 is the earth retaining sheet pile, 3 is the vibration isolation wall, 20 is the porous vibration isolation material, 21 is the shell, 21 C is the wedge-shaped projection, 22 is the tip, 26 is the overhanging part, 27 is a side plate, 28 is a tapered surface, 50 is a composite sheet pile, 60 is a guide sheet pile, 61 is a steel plate, 62 is a flat part, 63 is a reinforcing rib,
41 is a pile driver, and 42 is a tessel hammer or weight.

Claims (1)

[Scope of utility model registration request] A shell made of sheet piles has a main body filled with a lightweight porous anti-vibration member, and a tip that is integrated with the main body. A lightweight composite sheet pile for vibration isolation, characterized by having an overhanging part to which a driving jig is applied and a tapered surface.