JPH0735859Y2 - Work base and steel guide wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a steel guide wall used in continuous underground wall construction.

[Conventional technology]

Generally, in continuous underground wall construction, when excavating trenches (meaning deep trenches that have been vertically excavated in the ground), the top soil that is likely to collapse is protected, and the excavation bucket is guided to excavate accurately. A guide wall is installed for this, as is well known as the continuous underground wall construction method, concrete is placed in a trench formed in the ground in bentonite mud water,
It is a method of constructing a continuous wall in the ground. In the old days, it was built as a mountain retaining wall or a water blocking wall,
In recent years, with the progress of technology, the continuous wall constructed from an economical standpoint is often used as a part or the whole of the main body structure as it is.

Usually, the guide wall is constructed by concrete 101 cast on the wall surface of the trench 10 with a predetermined thickness as shown in FIG. Depending on the type of excavator and soil conditions, trench sheets, steel plates, precast concrete, etc. may be used repeatedly. After completion of the underground wall, the guide wall 10
Since 1 is immediately demolished, it is uneconomical to install and remove it, which is very expensive, and there is a problem that vibration and noise are generated during demolishing, which causes pollution problems.

In order to solve the above problems, for example, Japanese Patent Publication No. 1-4176
No. 9 gazette can be easily removed without dismantling,
Moreover, a steel guide wall that can be used for subsequent excavation is disclosed. Here, the steel guide wall will be described with reference to FIGS. 7 and 8. FIG. 7 shows the installation state of the steel guide wall, and FIG. 8 shows a plan view of the steel guide wall.

The steel guide wall 50 is a rectangular ruler plate 51 having a rectangular opening, a pair of wall plates 52 and 52 suspended along the long side of the opening, and a guide wall for the digging groove 55. It is provided with four jacks 53 for fixing. When excavating the trench, excavation is performed in the bucket 54 through the upper opening of the ruler plate 51. When the excavation of one element is completed, the steel guide wall 50 is moved to the next element and the excavation is sequentially performed.

[Problems to be solved by the device]

However, since the steel guide wall has a structure mainly focusing on diversion of the guide wall, for example, when excavating a trench, a heavy equipment for excavation or the like is placed close to or directly. In this case, vertical settlement and horizontal movement are expected due to the effect of the load. Therefore, it is necessary to take additional countermeasures such as strengthening earth retaining work against heavy load or strengthening the ground.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a steel guide wall that can be used as a work platform that enables the diversion of the guide wall and suppresses the subsidence and horizontal movement due to the influence of the load even when the heavy equipment is placed. Especially.

[Means for Solving the Problems]

The above problem is a pair of long boxes mounted along both wall surfaces of a trench formed in the ground, wherein the long boxes are made of steel and are placed. It can be solved by sufficiently reinforcing the load and ensuring that the ground contact area of the bottom of the long box is such that the reaction force of the bottom of the box is within the allowable ground reaction force of the ground. .

[Action]

Since the guide wall in the present invention is formed of a steel material in a long box shape, it can be easily removed and can be diverted.
Further, even if a heavy machine or the like is placed on the steel guide wall, since the load is sufficiently reinforced, the load can be supported. Furthermore, the ground contact area on the bottom of the long box is ensured so that the reaction force on the bottom of the box is within the allowable ground reaction force of the ground, which helps to distribute the load and prevent vertical subsidence. You can
It can function as a work platform. In the case of the conventional inverted L-shaped guide wall, setting is difficult and unstable,
In the case of the guide wall of the present invention, since it is placed directly on the ground as a box body, stability as a work platform is ensured.

Also, in the case of this steel guide wall, since it has a box structure and sufficient cross-sectional rigidity is secured in the longitudinal direction, it does not move horizontally even due to excessive earth pressure due to heavy equipment, etc. It can contribute to the improvement of accuracy.

[Specific configuration of device]

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is an installation state diagram of the steel guide wall of the present invention, 2
FIG. 3 is a cross-sectional view of the steel guide wall of the present invention, FIG. 3 is a view taken along the line III-III in FIG. 2, and FIG. 4 is a view taken along the line IV-IV in FIG.

As shown in FIG. 1, the steel guide wall 1 of the present invention is placed at a position along both wall surfaces of a digging groove 10 formed in the ground prior to trench excavation. The structure of the steel guide wall 1 will be described later in detail, but is basically a box-shaped elongated body, and in terms of dimensions, in the case of this embodiment, the height dimension is used.
The size is 926 mm, the width is 512 mm, and the length is 9,000 mm.

The length dimension of the steel guide wall 1 according to the present invention is
The length is desirably 2 m or more, preferably 5 to 20 m, and is appropriately determined depending on the ground conditions, heavy equipment loading conditions, and the like.

Reference numeral 7 is a lining plate that is horizontally bridged between the steel guide walls 1 and 1. Regarding the trench excavation portion of the lining plate 7,
A lining plate 7 is laid for crossing the work machine and the vehicle at other portions that are removed for excavation but do not hinder the work.

Next, the structure of the steel guide wall 1 will be described in detail.

As shown in FIG. 2, the steel guide wall 1 is composed of an upper beam 2 and a lower beam 3, and a connecting member 4 connecting the upper beam 2 and the lower beam 3, and further includes the connecting member 4 part. An enclosing shroud 5 is attached to form an overall sealed box. In the case of this embodiment, each of the members 2, 3 and 4 is
Basically, all of them are made of H steel, which requires less processing at the time of manufacturing and is economical as the manufacturing cost is low. In the case of this embodiment, H steel is H-250.
The size of x250x9x14 is used.

The upper beam 2 and the lower beam 3 are both made of two H steels arranged in parallel and integrated by welding. As shown in FIG. 3, the connecting members 4, 4, ... Form two sets of H steels in parallel to form a set of connecting members 4, and the beam members 2, 3 are provided at two positions at both ends thereof. The upper beam 2 and the lower beam 3 are connected to each other at a total of four positions, that is, two positions of three division points.

In the steel guide wall 1 of the present invention, since the box body configured as described above is formed, it can be easily removed after the construction is completed and can be diverted sequentially, so that the construction cost can be reduced and the concrete can be reduced. It does not cause pollution problems with removal as in the case of manufacturing.

In addition, in the case of a conventional steel guide wall, it requires skill in installation centering, leveling, and jacking at the time of installation, and both ends of the ruler plate and the tip of the wall plate are evenly distributed over the entire ground. It takes a lot of time to be installed in contact with a good balance, but in the case of the steel guide wall 1 of the present invention, since it is a box-shaped body of one block, the installation is easy and no skill is required.

Further, in recent years, many large-diameter thick continuous walls have been constructed, but in the case of the guide wall 1 of the present invention, it can be arbitrarily coped with by adjusting the distance between the steel guide walls 1, 1.

On the other hand, when the steel guide wall 1 is installed, as shown in FIGS. 3 and 5, two through holes 2a, 2a straddling the web are provided in advance on the upper flange of the H steel of the upper beam 2 and the web. If the through hole 2b is formed at the position, the shackle 6 can be passed through the through holes 2a and 2b at the time of hoisting, as shown in FIG.

On the other hand, when a trench sheet, steel plate or precast concrete is used as the guide wall, one block length in the direction of the trench is the same as that of the trench sheet.
About 250 to 400 mm, 50 for precast concrete
Since it is as short as 0 to 1000 mm, water leaks from seams everywhere cannot be avoided. However, in the case of the guide wall 1 of the present invention, since it is a long box-shaped body, it is possible to completely secure the waterproofness in the member.

If the bearing capacity of the ground to be excavated is small and ground subsidence is expected, the number of H steels forming the lower beam 3 is set to 3 and the contact area with the installation ground is set as shown in FIG. By securing a large amount, the load can be distributed, and by reducing the ground reaction force, ground subsidence can be suppressed.

[Effect of device]

As described above in detail, according to the present invention, not only the function as the guide wall but also the work base can be used.

[Brief description of drawings]

Fig. 1 is an installation state diagram of the steel guide wall, Fig. 2 is a cross-sectional view of the steel guide wall, and Fig. 3 is III-I of Fig. 2.
II line arrow view, FIG. 4 is a IV-IV line arrow view of FIG. 2, FIG. 5 is a detailed view of a main portion of a steel guide wall lifting portion, and FIG. 6 is a steel guide wall Cross-sectional shape modification example, 7th
FIG. 8 and FIG. 8 are views showing a conventional steel guide wall, and FIG. 9 is a view showing a conventional concrete guide wall. 1 ... steel guide wall, 2 ... upper beam, 3 ... lower beam, 4 ... connecting material, 5 ... enclosure

Claims (1)

[Scope of utility model registration request] 1. A pair of long boxes mounted along both wall surfaces of a trench formed in the ground, wherein the long boxes are made of steel and are placed. The work is characterized by being sufficiently reinforced against the load, and the ground contact area on the bottom of the long box is ensured so that the reaction force on the bottom of the box is within the allowable ground reaction force of the ground. A guide wall that doubles as a stand.