JPS6134533B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turning device for concrete earth retaining shoring when underground structures such as shafts and shafts are constructed deep underground.

For example, a continuous underground wall, etc., is constructed by turning the main body of a shaft or shaft in advance, and while excavating the inside of the main body one after another, multiple stages of RC structures are constructed to serve as earth retention shoring along the inside of the main body wall. When constructing, conventionally the ground was used as formwork support.

That is, the ground is excavated to the planned lower end line of the RC structure, and after shaping, a formwork is constructed on the ground.

Therefore, at the bottom of each level of excavation, work such as floor excavation, land leveling, leveling concrete (or dumping formwork), etc. is required, and concrete is poured into formwork above the ground to achieve the specified strength. It is not possible to move on to the next excavation process until a curing period has passed, and during this period the work is suspended, resulting in extremely low efficiency. On the other hand, there is a type of reverse-rolling method in which concrete is poured sequentially from above and the formwork is also suspended from above (Japanese Patent Application Laid-Open No. 57-19420
issue). According to this, the lower part of the formwork can be excavated immediately after concrete is poured without passing through the curing period, and the above-mentioned inconvenience can be solved. However, since this requires support from above the frame, which is continuous from top to bottom, it is suspended in a series from above, and as the frame progresses, the hanging members become longer, and as a result, the construction progresses. As the number of parts increases, the number of parts increases, making handling difficult.

The purpose of the present invention is to eliminate the above-mentioned disadvantages of the conventional example, simplify the work process, eliminate the need for a pause period when moving to the next process, and also move the hanging position of the formwork downward in sequence. By changing the structure, the number of hanging members can be kept to a minimum, and handling is easy and work efficiency can be increased. An object of the present invention is to provide a turning device for concrete earth retaining shoring in underground structures.

According to the present invention, this purpose is to construct a plurality of stages of concrete earth retaining shoring that protrudes inward within the building frame wall, and the bottom form frame material is attached to the upper part of the suspended support via the load receiving material. A side form frame member is rotatably provided at one end of the bottom form frame member, and the lower end of the hanging steel member having lifting and lowering and hanging means that can be attached to and detached from the hanging steel member is attached to the bottom form frame member and the suspension support. This is achieved by penetrating the material from above and suspending the bottom form frame material and the suspension support material along the inside of the frame wall using this hanging steel material.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a partially cutaway plan view showing a first embodiment of the present invention, and Fig. 2 is a vertical cross-sectional side view of the same. A nut 2 is screwed onto the upper end of the hanging steel material as a means for raising, lowering, and latching it to the earth retaining support, and the lower end is fixed to the lower surface of the hanging support material 3 with a nut 4.

A steel bottom formwork 7 is placed on top of the suspension support 3 via a load bearing member 6 made of channel material, fixed by bolting or welding, and furthermore, a steel bottom formwork 7 is placed on one side end of this bottom formwork 7. The lower end of the side formwork 8 is connected with a pin or the like so that it can rotate to some extent.

The overall planar shape of these suspension supports 3, bottom formwork 7, and side formwork 8 should naturally match the planar shape of the concrete earth retaining support to be lathed, and in the example of the drawing, the frame wall 13 is octagonal. Since the inner surface of the support was circular, the hanging support 3 and the bottom form 7 were octagonal on the outside and circular on the inside, and the side form 8 was formed in a circle.

Note that all of these are composed of a set of an appropriate number of division bodies.

Further, a center comb shape 9, which is a hoop material, is provided on the inner surface of the upper part of the side formwork 8 to fix the side formwork 8 in a vertically erected state.

On the other hand, a rectangular hanging frame 10 is provided integrally with the hanging support 3, and the hanging hole 10a formed in the hanging support 10 is inserted into the side formwork 8.
Projects inward from the inside.

In addition, a sleeve pipe 11 to cover the hanging steel material 1 and washers to be used together with the nuts 2 and 4 as necessary are prepared, and an auxiliary formwork 12 is connected to the outside of the bottom formwork 7.

Next, how to use the present invention will be explained.

For example, the frame wall 13 as an earth retaining wall is built in advance by a turning method such as a continuous underground wall, and this frame wall 13
Concrete earth shoring along the inside of 14,1
5 has already been formed, and a shoring 16 is to be formed below the shoring 15.

First, the ground 18 within the frame wall 13 is excavated from directly below the support 15 to directly below the support 16.

The hanging steel 1 is suspended through the through hole formed by the sleeve pipe 11 buried in the shoring 14, 15, and the nut 2 is screwed onto the upper end of the hanging steel 1 protruding from the upper surface of the shoring 14 to hang it. .

At the lower end of the hanging steel material 1, the hanging support material 3, the bottom formwork 7,
The side formwork 8, auxiliary formwork 12, etc. are suspended via nuts 4, reinforcing bars are assembled inside the formwork, and concrete is poured to construct the shoring 16. At this time, a sleeve pipe 11 is set around the hanging steel member 1.

The auxiliary formwork 12 only needs to fill the gap between the frame wall 13 and the bottom formwork 7, and is fixed to the bottom formwork 7 on one side using a simple material such as plywood veneer.

After constructing the shoring 16 in this way, as shown in Fig. 3, the next shoring 1 to be constructed is
Dig the ground 18 to just below point 7. This excavation work can be performed immediately without waiting for the concrete curing period of the shoring 16.

After the curing period has passed, the center comb 9 is loosened to make the side formwork 8 incline a little inward, and the nuts 2 on the shoring 14 are loosened, the hanging steel 1 is lowered and the bottom formwork 7 and the side formwork are loosened. 8 is demolded from the shoring 16.

On the other hand, using a crane or the like, the hanging hole 10a of the hanging frame 10 is
Hold the demolded formwork in the air by suspending it with a wire, remove the nuts 2 from the hanging steel 1, and install the next shoring 1.
Lower the formwork to the construction position in step 7.

In this state, the upper end of the hanging steel 1 passes through the support 14 and drops to the top surface of the support 15, so if the nut 2 is screwed onto this and the wire suspension of the hanging frame 10 is released, the hanging support 1 The upper bottom formwork 7 and side formwork 8 will now be suspended by the shoring 15.

Thereafter, lower-level shoring will be constructed in the same manner. The reason why the formwork was not suspended from the support directly above it, but from support at least two levels above it, was to prevent the waiting period for curing after concrete was poured, but this is not necessarily the case. It's not something you can do.

FIG. 4 is a longitudinal sectional side view showing a second embodiment of the present invention, and the illustrated example shows the case where the formwork is suspended from the shoring directly above. In this case, the sleeve pipe 11 has at least a larger diameter than the nut 2, and an intermediate fixing nut 2' is screwed into the middle of the hanging steel member 1.
Furthermore, an anchor washer 19 having a notch 19a and which can be set from the side of the hanging steel member 1 as shown in FIG. 5 is used for the nuts 2, 2'.

In this embodiment, after loosening the center comb 9 and the side formwork 8, the intermediate fixing nuts 2', which have been set in advance on the hanging steel 1, are lowered to the top of the shoring 16. Insert the anchor washer 19 between the end and the nut 2'. Shoring 15
When the upper nut 2 is loosened and the anchor washer 19 is removed, the suspension fulcrum of the hanging steel member 1 is shifted from the support 15 to the support 16.

Next, loosen the nuts 2' and gradually lower the suspension supports 3, bottom formwork 7, side formwork 8, etc. Once the entire formwork has been lowered to an appropriate position, use the suspension frame 10 to temporarily lower the intermediate suspension nuts. 2' into the sleeve tube 11.

At the same time, lower the upper nut 2 to this position and fix it to the top of the shoring 16. Further, the nut 2 is rotated to set the entire formwork to the construction position of the next supporting structure 17. Other methods are shown in Figures 2 and 3 above.
This is the same as the first embodiment shown in the figure.

When this second embodiment is used, compared to the first embodiment, the intermediate hanging period is shortened by using the hanging frame 10, and the work of changing the hanging steel material 1 can be carried out easily.

Furthermore, the entire formwork is large and heavy, and the hanging frame 10
There may be cases where it is not possible to carry out intermediate suspension using .

In this case, a coupler may be provided in the middle of the hanging steel material 1, and the hanging steel material 1 may be temporarily cut at this portion and the intermediate nut 2' of the second embodiment may be inserted therein to reposition it.

As described above, the present invention is an underground structure construction method in which a frame wall is constructed first, and concrete earth retaining shoring is constructed in multiple stages while sequentially excavating the inside of the frame wall. Hang the formwork for the bottom and side walls from the concrete earth retention shoring, use the formwork to construct the lower concrete earth retention shoring, and in this way, sequentially change the hanging position of the formwork to the lower concrete earth retention shoring. Since we decided to relocate the concrete earth retaining shoring and construct the lower level concrete earth retaining shoring, unlike the conventional case where the ground is directly used as formwork shoring, the concrete earth retaining shoring can be installed without waiting for the concrete curing period after construction. Not only can excavation be started immediately and work can be carried out efficiently, but only short hanging members are required, and the length remains long even when the construction position of the earth retaining shoring is moved to a lower level. Since no damage occurs, handling is easy and construction efficiency can be increased.

In addition, the work such as floor excavation, site leveling, leveling concrete, or waste form work at the bottom end of the excavation of each stage of concrete earth retaining shoring is unnecessary, and construction can be easily performed with a small number of steps.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view of the same, Fig. 3 is a longitudinal sectional side view showing the next step after Fig. 2, and Fig. 4 is a partially cutaway plan view showing an embodiment of the present invention. A vertical side view showing the second embodiment, and FIG. 5 is a plan view of the nut portion. 1... Hanging steel material, 2, 2', 4... Nut, 3...
... Hanging support material, 6 ... Load receiving material, 7 ... Bottom formwork, 8
... Side formwork, 9 ... Center comb shape, 10 ... Hanging frame, 10a ... Hanging hole, 11 ... Sleeve pipe, 12
...Auxiliary formwork, 13...Structure wall, 14, 15, 1
6,17... Concrete earth retaining shoring, 19...
Anchor washer, 19a...notch.

Claims (1)

[Claims] 1. When constructing multiple stages of concrete earth retaining shoring that protrudes inward within the building frame wall, the bottom form frame material is placed on top of the suspension support material via the load bearing material, and one of the bottom form frame materials is A side formwork member is rotatably provided at the side end, a means for lifting and lowering and latching the hanging steel member to the earth retaining shoring is detachably provided at the upper end of the hanging steel member, and the lower end of the hanging steel member is attached to the bottom formwork. A turning device for concrete earth retaining shoring in an underground structure, characterized in that the bottom form frame material and the hanging supports are suspended along the inside of the building frame wall by penetrating the steel material and the hanging supports from above. .