JPS5927024A - Construction of continuous underground wall - Google Patents

Abstract

PURPOSE:To smoothly finish up the wall of an on-site RC continuous underground wall by a method in which an iron bar cage whose inside is attached with a precast concrete slab for set iron bar reinforcement is inserted into a trench and then concrete is placed into the cage. CONSTITUTION:A 5-6cm thick precast concrete slab 9 for set iron bar reinforcement is integrally attached to the inside face of an iron bar cage 8 inserted. The iron bar cage 8 is inserted into the trench, and concrete 1 is placed between the precast concrete slab 9 and the trench wall 5, whereupon an RC continuous underground wall having a given smooth face is constructed. Since the surface of the underground wall is smooth, the underground wall can be utilized as it is as formwork material having improved function and also as base material for outside water-proofing work.

Description

[Detailed description of the invention] This invention relates to a construction method for continuous underground walls.

The wall surface of a continuous underground wall of cast-in-place RO is uneven due to the adhesion of earth and sand to the surface from the soil layer and the collapse of the trench wall.

For this reason, it is necessary to clean and fold the walls when constructing the frame or waterproofing the groundwork.

In addition, the current situation is that waterproofing work requires work such as applying a second mortar base coat.

That is, as shown in Figure 1A, the wall surface of the cast-in-place RO continuous underground wall 1 usually has unevenness 2 due to the adhesion of earth and sand, collapse of the trench wall, etc.

If things continue as they are, it will interfere with the construction of the exterior wall structure on the basement floor and the exterior waterproofing groundwork, so two and three scaffolds will be erected.

Worker 4 must clean and clean the wall surface and smooth it as shown on the four sides.

Note that 5 in Figure 2 indicates the back soil layer.

When carrying out waterproofing work on a wall surface, the current situation is that a mortar base coat 6 is required as shown in Figure 1, and an outer waterproof layer 7 is applied on top of this.

As a result, the burden of work such as removing temporary scaffolding increased.

The construction period will be extended and the cost will be excessive.

Therefore, as a means to omit the troublesome smoothing correction work that would increase the price, there is a construction technique that inserts a precast concrete slab, which is the trench wall itself, into the continuous wall trench, but it is a 2-heavy object and has a depth of 10 mm. ? It is only a technology that supports FL level,
It has the disadvantage that it cannot be adapted to depths beyond that level.

This invention was considered a failure due to price reasons.

It is not limited by the groove depth, and without the need for wall surface modification work, it can finish the wall surface of cast-in-place RO continuous walls smoothly, improve its function as a formwork material, and use it as a base for external waterproofing work. Its feature is that a precast concrete plate reinforced with prefabricated thin walls is taken from the inner surface of the rebar cage and inserted into the groove.

Details of this will be explained below based on the drawings.

That is, FIG. 2A shows the reinforcing bar cage 8 inserted into the groove according to the present invention, and there are two holes on the inner surface of the root cutting side.

For example, a precast concrete slab 9 with a thin wall of about 5 to 6 crn reinforced with prefabricated reinforcing steel is installed integrally, but in terms of weight, it is not very bulky, like the precast concrete slab that is the trench wall itself described in BA. It won't be.

This special reinforcing bar cage 8 is inserted into the groove, concrete is poured, and the completed product is shown in the two-piece drawing, and the smooth surface of the precast concrete slab 9 is exposed when the roots are cut.

However, with only simple manual cutting such as washing off the adhesion,
It can be used as it is for the construction of the exterior wall of the basement floor, and if waterproofing work is to be carried out, the outer waterproofing layer 7 can be used immediately as shown in the figure.
All you have to do is

As mentioned above, according to the present invention, an RO continuous underground wall with a predetermined smooth surface can be constructed by constructing an inserted reinforcing bar cage with a weight sufficient to allow it to be lifted and by pouring concrete. That's what it is.

Very suitable.

2 The advantages of the construction method of the present invention compared to the conventional construction method are as follows.

Quality: Improved frame accuracy due to improved wall surface accuracy.Complete waterproof foundation due to improved wall surface accuracy.Construction compatible with deep continuous walls.Cost: 30% compared to conventional methods.DOWIJ Construction period: 20-30% compared to conventional methods. shortening of

[Brief explanation of drawings]

Figure 1 A, 4, and C are construction procedure diagrams using conventional construction methods. Figures 2A and 2C are construction procedure diagrams of the construction method of the present invention. 8... Inserted reinforcing bar basket 9... Precast frame for reinforcing assembled reinforcing bars (REIT version Zutsu IAI) = 108

Claims (1)

[Claims] A continuous underground wall construction method characterized by attaching a precast concrete plate reinforced with thin prefabricated reinforcing bars to the inner surface of inserted reinforcing bars, inserting them into a groove, and pouring concrete.