JPS609173B2 - Precast underground continuous wall and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground continuous wall made of prefabricated precast concrete slabs and a construction method thereof.

Conventionally, underground continuous walls have been constructed by excavating the ground using the muddy method, inserting reinforcing bars into the excavated grooves, and placing cast-in-place concrete, but this requires special excavation equipment and concrete Special ingenuity and technology are required, such as reinforcing the joints and treating muddy water, and it is difficult to construct reliable underground walls.

Therefore, the inventor had previously proposed a construction method for constructing a continuous underground wall that ensured quality by folding in precast concrete slabs, but this invention was developed to make it more practical, and the patent claims The invention in scope 1 provides for a partition wall to be protruded from a large panel at a required interval,
and consists of a unit plate with a protruding piece provided at the tip of the bulkhead, and a unit plate having a mating hole into which the protruding piece of the unit plate is inserted, and each of the unit plates is inserted with its protruding piece into the gangling hole. It is characterized by a precast underground continuous wall that is assembled and inserted underground, and the invention according to claim 4 has a partition wall projecting laterally from a large panel at a required interval, and a partition wall at the tip of the partition wall. A unit plate provided with a projecting piece and a unit plate having a competing hole that encloses the projecting piece of the unit plate are closely integrated by inserting iron into the matching hole to form an assembled concrete slab, and this assembly is performed. Concrete slabs are inserted underground in parallel to construct a continuous underground wall, excavation is made between the continuous underground walls, and reinforcing bars are installed and reinforced on the mounting anchors provided on the unit plates, and underground beams or floors are installed. It is characterized by the construction method of the precast underground continuous wall that makes up the slab. The details will be explained below with reference to illustrated embodiments. A precast concrete slab 1 that becomes an underground continuous wall is a unit plate A having vertical partition walls 3 projecting from a large panel 2 at the required intervals horizontally, and insert protrusions 4 projecting from the tips of the partition walls at the required intervals vertically. and a unit plate B in which a large panel 5 has iron fitting holes 6 for the insertion protrusions 4 formed at required intervals are produced in a factory, and assembled after being transported to a construction site.

When assembling, adhesive is applied to the projecting piece 4 of the unit plate A, and the projecting piece 4 is inserted into the iron fitting hole 6 of the unit plate B so as to be brought into close contact and integrated. Incidentally, at both ends of the unit plate B, joint fittings 7, 7 are provided which are vertically slidably engaged with the fittings on the unit plates of the adjacent precast concrete slab.

In addition, the lower end of the panel 5 of each unit board A and the lower end of the partition wall 3,
A pointed metal fitting 8 is provided at the lower end of the unit plate B to facilitate erection pressure. Incidentally, the unit plate B can be made longer than the unit plate A as shown in FIG. 6 to facilitate the bonito filling. Further, an anchor fitting 9 for attaching beam reinforcing bars is buried in the middle of the unit plate B. When performing construction on site, first install a guide wall (not shown), check the position of the precast concrete slab 1 to be folded along the guide wall, and adjust the thickness of the precast concrete slab 1 directly under the bulkhead 3 if necessary. Excavate with a screw auger of the same diameter as , and press-fit into the ground using a vibrating press-in machine 10 or the like. Next, the adjacent precast concrete slab 1 is similarly press-fitted into the ground while engaging its joint fittings 7, 7. Next, the adjacent precast concrete slab 1, 1
The space between them is excavated in advance or later with a clew auger 11 to remove earth and sand, a reinforcing bar cage 12 is inserted, and cast-in-place concrete is placed in that part to integrally connect each precast concrete slab 1, 1. If the ground is hard, the trench may be constructed in advance using an excavator before construction, or the muddy method may be used to prevent the trench from collapsing while being lowered, but it is preferable to press the trench directly into the ground. However, it is preferable to drive. By the way, when constructing an underground structure such as an underground railway, the precast concrete slabs 1 and 1 described above are constructed in parallel at the required intervals, the space between the continuous underground walls formed by them is excavated, and the anchor fittings 9 are Reinforcement bars 13 are installed and reinforced, and underground beams 14 or floor slabs 15 are constructed.

This invention consists of the above-mentioned configuration, and it is difficult to control the quality of concrete in conventional continuous underground walls cast in place, and the frame walls of underground structures are constructed on-site inside the continuous underground walls. According to the invention, an underground continuous wall with guaranteed quality can be obtained, so it can be used as a frame of an underground structure as it is.

In addition, since the underground wall is a precast concrete slab that can be assembled, the hollow wall can be easily assembled on site, and it is also easy to manufacture and transport to a factory. Additionally, the lateral joints of the precast concrete slabs can be completely integrated using cast-in-place concrete with reinforcing bars inserted.

Furthermore, the unit plates are equipped with anchor fittings, making it easier to construct underground beams and floor slabs.

[Brief explanation of the drawing]

Figure 1 is a perspective view of each unit plate, Figure 2 is a perspective view of the assembled precast concrete slab, Figure 3 is a perspective view of the construction state, Figure 4 is a plan view, and Figures 5 and 6 are longitudinal sections. Front view, No. 7
The figure is a longitudinal cross-sectional view when an underground beam etc. are provided, and FIG. 8 is a detailed cross-sectional view of the anchor fitting. A, B...Unit plate, 1...Precast concrete IJ-plate, 2...Large panel, 3...Partition wall, 4...Protrusion piece, 5...・Large panel, 6...
...Mating hole, 7...Joint fitting, 8...
・Pointed metal fitting, 9...Anchor metal fitting, 10...
・Vibrating press-fitting machine, 11...Screw auger, 12...Reinforcement cage, 13...Reinforcement bar, 14
...Underground beam, 15...Floor slab. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. A unit plate having a partition wall projecting from a large panel at a required interval and a projecting piece provided at the tip of the partition wall, and a unit plate having a fitting hole into which the projecting piece of the unit plate is fitted. 1. A precast underground continuous wall, characterized in that said unit plates are assembled by inserting their projecting pieces into fitting holes, and then inserted underground. 2. The precast underground continuous wall according to claim 1, wherein a pointed metal fitting is provided at the lower end of each unit plate and partition wall. 3. The precast underground continuous wall according to claim 1, wherein a joint fitting is provided on the connection side edge of the unit plate. 4 A unit plate with a partition wall protruding from a large panel at a required interval laterally, and a projecting piece provided at the tip of the partition wall, and a unit plate having a fitting hole into which the projecting piece of the unit plate is fitted, and the projecting piece is fitted into the unit plate. They were inserted into the joint holes and tightly integrated to form an assembled concrete slab, and the assembled concrete slabs were inserted underground in parallel to construct a continuous underground wall, and the spaces between the underground continuous walls were excavated and installed in unit plates. A method of constructing a precast underground continuous wall, which is characterized by attaching and arranging reinforcing bars to mounting anchors to form underground beams or floor slabs.