JPS6124625Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a top-opened or U-shaped excavator for open shield construction to dig underground, and a precast concrete foundation plate is suspended and set on the bottom of the excavator. This invention relates to a precast concrete foundation plate for the open shield construction method, in which a structure is suspended above and repeatedly set to construct a structure underground.

In the conventional open shield construction method, the underground structure is suspended and set directly on the bottom of the excavator, which causes the underground structure left behind the excavator to settle unevenly, causing uneven settlement of the underground structure. It had some useless flaws.

In addition, when pouring foundation concrete in place using an excavator without a bottom surface, there is a drawback that the construction period becomes longer due to the need for pouring work and time for the concrete to cure. Due to these drawbacks, the open shield construction method, which has superior advantages, was not popularized.
The present invention aims to eliminate the above-mentioned drawbacks.

That is, the basic plate of the present invention is a precast concrete basic plate with grooves provided to prevent it from sliding laterally when a pipe or box is placed on the top surface.
For the end surface joint, a steel plate with bolt holes surrounded by steel material in a box-shaped manner is fixed integrally with the foundation plate using anchor bolts.
It is suspended above the bottom of the open shield excavator and fixed with bolts to the end face of the existing foundation slab, allowing underground structures such as pipes or boxes to be suspended and set. The advantage of this invention is that it prevents uneven settlement of the underground structure on the foundation plate which is left in the ground behind the excavator and is integrally fixed with bolts, and it also prevents the underground structure from settling due to the groove on the foundation plate. This has the advantage of preventing lateral slippage.

In addition, when using an excavator with only side earth retaining materials without a bottom surface, it is possible to omit the casting of a cast-in-place concrete foundation and simply suspend and set the precast concrete foundation plate of this invention, making it easier to pour concrete. It has the advantage of reducing labor and construction time. The present invention will be described below with reference to embodiments and drawings.

The basic version 1 of the present invention uses an excavator 2 with an open top or a U-shape for open shield construction as shown in Figs. 1 and 2. A foundation slab 1 made of precast concrete and having grooves on the upper surface for stable installation of the underground structure 4 is suspended, fixed with bolts to the existing foundation slab 1, and set as one unit, and the ground is placed on top of it. Medium structure 4
is suspended and set, the propulsion jack 3 is operated to advance the excavator 2, the face earth is cultivated with an excavator such as a backhoe on the ground, and the underground structure is backfilled and covered with soil 5 as appropriate. It is used when constructing structures underground. That is, Fig. 4 a, b,
As shown in c, there is a groove 6 on the top surface for installing the underground structure 4.
As shown in FIGS. 5 and 6, the base plate 1 has bolt holes 8 on both end faces, and the base plate 1 side of the bolt holes is made of steel material such as a channel so as to form a cylindrical body 11. This is a foundation slab 1 made of precast concrete in which an enclosed steel plate 7 is fixed to the end face of the foundation with anchor bolts 9, and is integrated with an adjacent foundation slab by using the bolt holes 8 of the steel plate 7 and fixed with bolts 10. It is used.

As is clear from the above explanation, the foundation plate of the present invention is a foundation plate used as a foundation when constructing an underground structure by the open shield method, and has a groove for installing an underground structure on the top surface of the foundation plate. This prevents the underground structure from shifting from side to side on the foundation slabs left in the ground, and also connects and fixes the foundation slabs together with bolts to form a single unit, preventing uneven settlement and making it possible to use cast-in-place concrete foundations. Compared to this, it saves time and labor, and in the case of open shield excavators with a bottom, underground structures were conventionally installed directly on the bottom of the excavator, so the open shield method was not adopted in soft ground. By using the foundation of the present invention, it has the same effect as the foundation for the open-cut method, and has many advantages and effects, such as being able to construct underground structures using the open shield method even on soft ground.

The present invention has been described above with reference to embodiments and drawings, but of course the present invention is not limited to these embodiments and can be modified in various ways without departing from the spirit of the invention. be.

[Brief explanation of the drawing]

Figures 1 and 2 are front views of the foundation board of the present invention in use, Figure 3 is a side view, Figure 4 is a front view of the present invention, Figure 5 is a plan view, and Figure 6 is a side view. It is. 1...Foundation plate, 2...Excavation machine, 3...Propulsion jack, 4...Underground structure, 5...Backfilling and covering soil, 6...
... Groove, 7 ... Steel plate, 8 ... Bolt hole, 9 ... Anchor bolt, 10 ... Bolt, 11 ... Cylindrical body.

Claims (1)

[Scope of utility model registration request] Regarding the foundation plate made of precast concrete that is installed on the bottom of the excavator when constructing underground structures using the open shield method using a type or U-shaped excavator, the foundation plate is In addition to providing grooves for installing medium structures, bolt holes are provided at required positions in the end surface joints, and the base plate side of the bolt holes is surrounded by a steel plate in a box-like shape, and the steel plate is anchor bolted or rebar welded, etc. A foundation plate made of precast concrete used for the open shield construction method that is installed integrally with the foundation.