JPS6124623Y2 - - Google Patents

Description

[Detailed description of the invention] This invention involves using a top-opened or U-shaped excavator for the open shield method to dig underground, and a precast concrete foundation plate is suspended and set on the bottom of the excavator. This invention relates to a foundation version of precast concrete for use in the open shield construction method, in which a structure is constructed underground by repeatedly suspending and setting the structure thereon.

In the conventional open shield construction method, underground structures are suspended directly onto the bottom of the excavator without providing a foundation, which causes uneven settlement of the underground structures left behind the excavator. There was a drawback that the underground structure was useless.

In addition, when using an excavator without a bottom surface and pouring foundation concrete by pouring in place, there is a disadvantage that the construction period becomes longer due to the need for pouring labor 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.

In other words, the base plate of the present invention is a precast concrete base plate with grooves provided to prevent sideways slipping when a pipe or box is placed on the top surface, and the base plate can be bolted together to integrate the base plate. This is a foundation version in which underground structures such as pipes or boxes can be suspended and set on top of the foundation version, which is suspended and installed on the bottom of the open shield excavator and secured with bolts. The advantage of this invention is that it prevents uneven settlement of the underground structure on the integrated foundation plate left underground behind the excavator, and also prevents lateral displacement of the underground structure by the groove on the foundation plate. There is. In addition, when using an excavator with only side retaining materials without a bottom surface, it is possible to omit the casting of a cast-in-place concrete foundation and simply hang and set the precast concrete foundation plate of this invention, reducing the time and effort required for concrete pouring. This has the advantage of shortening the construction period.

Hereinafter, the present invention will be described 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, and the bottom of the excavator 2 as shown in Fig. 3. A foundation plate 1 made of precast concrete and having grooves on the upper surface for stably installing the underground structure 4 is suspended and set, the underground structure 4 is suspended and set on top of the foundation plate 1, and the propulsion jack is turned on. The open shield operates to advance the excavator 2, remove the face earth and sand to the ground using an excavator such as a backhoe, and repeat the process of backfilling and covering the underground structure with soil 5 to construct an underground structure. This is a foundation plate made of precast concrete used in the construction method, and as shown in Figure 4 a, b, and c, a groove 6 with a concave or curved surface for installing an underground structure 4 is provided on the top surface, and bolt holes are provided at both ends. 8, so that the bolt holes 8 are on the end face side of the foundation plate 1, and the openings of the steel cylinder 7 are opened at the top and bottom surfaces of the foundation plate 1, and the anchor bolts 9 are attached to the foundation. The foundation plate 1 is made of precast concrete and is embedded integrally with the foundation plate 1. The foundation plate 1 of the present invention is suspended above the bottom surface of the excavator 2 for open shield construction, and is attached to the existing foundation plate. 1 and bolts 10 to use as one unit.

As is clear from the above explanation, the foundation slab of the present invention is a foundation slab made of precast concrete used for the foundation when constructing underground structures by the open shield method, and the underground structure is placed on the top surface of the foundation slab. A groove for installation is provided to prevent the underground structure from shifting from side to side on the foundation slab left underground, and by bolting it into one piece, it prevents uneven settlement and cast-in-place concrete. Compared to foundations, the construction period is shortened by eliminating the need for pouring and curing, and in the case of open shield excavators with a bottom, underground structures are conventionally installed directly on the bottom of the excavator, making it easier to use in soft ground. Although the open shield method was not adopted, by using the foundation of this invention, it is possible to construct underground structures using the open shield method even on soft ground, and it has the same effects as foundations using the open cut method. There are advantages and effects.

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, and Figure 5 is a plan view. 1...Foundation plate, 2...Excavation machine, 3...Propulsion jack, 4...Underground structure, 5...Backfilling and covering soil, 6...
...Groove, 7...Steel tube, 8...Bolt hole, 9...Anchor bolt, 10...Bolt.

Claims (1)

[Scope of utility model registration request] Regarding the precast concrete foundation plate installed on the bottom of the excavator when constructing underground structures by the open shield method using a type or U-shaped excavator with an open top, the precast concrete foundation plate is installed on the top surface. In addition to providing a groove for installing an underground structure, a steel tube with bolt holes at the end surface joint is integrally attached to the foundation plate by anchor bolts or reinforcing bar welding, and the opening of the steel tube is connected to the top surface of the foundation. Made of precast concrete used for the open shield construction method, the bolt holes are arranged so that they are on the bottom side and the bolt holes are on the end face of the foundation slab, and adjacent foundation slabs can be bolted together and fixed as one unit. Basic version.