JP2750387B2 - Construction method of reverse winding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] [0001] The present invention relates to a reverse winding method in which construction is sequentially advanced to a lower portion while supporting a retaining wall using a permanent structure.
Particularly, the present invention relates to a construction method using an expansion joint having a free structure.

"Conventional technology" As a construction method applied to construction of an underground mall or the like, there has been conventionally known a reverse winding construction method in which a slab or the like is completed while digging, and a digging is further performed. This reverse winding method is used when the surrounding ground is bad, or when the soil is deformed due to digging deeply, which may affect nearby structures. This is a construction method that advances construction to the lower part.

On the other hand, as a structure often used in water treatment facilities such as a water purification plant and a sewage treatment plant, for example, an expansion joint having a free structure as shown in FIG. 5 is known. This expansion joint is generally used to control the temperature,
A connection provided to prevent harmful effects such as expansion, contraction, vibration, and cracks due to earthquakes and differential settlement.
In the example shown in FIG. 5, joints 11 are connected between the slabs 10 and 10, and a water blocking plate 12 is embedded between the slabs 10 so as to be orthogonal to the joints 11. The expansion joint having such a free structure has a structure in which none of the axial force, the moment, and the shearing force is transmitted.

"Problems to be Solved by the Invention" By the way, when using a free-structured expansion joint such as a water-related facility, the above-mentioned reverse winding method is adopted because the load is not distributed to the entire slab. Therefore, after placing concrete, it is necessary to replace the cutting beam support and to replace the load with another cutting beam support, so that a refill beam or the like is required. Therefore, in such a construction method, there is a dissatisfaction that the construction scale is increased, the construction period is lengthened, and the cost is increased.

[Means for Solving the Problems] Therefore, in the construction method of the reverse winding method according to the present invention, as a beam or a floor slab of a permanent structure, outwardly protruding near at least one of the connection ends of the top surface and the bottom surface. A slab having reaction force projections is formed, and a plurality of the slabs are connected by an expansion joint having a free structure. Then, force is transmitted between the reaction force projections of these slabs between slabs such as jacks or concrete. The above problem was solved by arranging a connecting material that enables the above, and removing the connecting material after the construction of the structure was completed.

According to the construction method of the reverse winding method according to the present invention, between the slabs connected by the expansion joint having the free structure,
Since the connecting members that enable transmission of the force between the slabs through the reaction force projections formed on the slabs are provided, these slabs can be applied as supports in the reverse winding method. Further, by removing the connecting material after the construction of the structure is completed, the connection between the slabs again becomes an expansion joint having a free structure.

"Example" Hereinafter, an example of the construction method of the reverse winding method of the present invention will be described with reference to the drawings.

1 to 3 show an example in which the present invention is applied to construction of a water treatment facility such as a water purification plant or a sewage treatment plant.

In this example, first, concrete is poured between the retaining walls 1 and 1 shown in FIG. 1 to form slabs 2 and 2 serving as an upper floor slab after the construction is completed, and a free structure is provided between the slabs 2 and 2. Connect with the expansion joint. Here, as shown in FIG. 2, the slab 2 has reaction force projections 3, 3 protruding outwardly on the top side and the bottom side near the connection end thereof.
3 is formed simultaneously with the slab formation. In addition, the expansion joint having a free structure has a structure in which the expansion joint is connected with a joint material and a waterproof plate is buried in the same manner as the conventional expansion joint shown in FIG.

Next, jacks 4, 4 such as screw jacks and hydraulic jacks are arranged as connecting members between the respective reaction force projections 3, 3,
By expanding these, the reaction force projections 3, 3 are pressed from the inside, whereby the force can be transmitted between the reaction force projections 3, 3 via the jack 4. Then, the slabs 2, 2 can transmit the axial force via the reaction force projections 3,... And the jacks 4, 4, and serve as a support for supporting the retaining walls 1, 1.

Next, construction is advanced sequentially to the lower part of the slabs 2, 2 to complete construction of the structure.

Thereafter, after all the structures are completed, the jacks 4, 4 are removed from between the reaction force projections 3, 3, and the reaction force projections 3 are also removed by grinding or the like as shown in FIG. Then slab
For 2,2, the connection between them again becomes an expansion joint with a free structure.

In such a construction method, the jacks 4 that enable transmission of the force between the slabs 2 and 2 via the reaction force projections 3 and 3 formed on the slabs 2 and 2 are arranged. 2 can be used as a support, whereby a connection body with a free structure expansion joint can be used in the reverse winding method. In addition, by removing the connecting material after the construction of the structure is completed, the connection between the slabs can be made into an expansion joint having a free structure again.

In the above example, the jack 4 is used as the connecting member disposed between the reaction force projections 3, 3. Alternatively, for example, reinforced concrete can be used. In the case of using reinforced concrete, as shown in FIG. 4, a reinforced concrete 5 is arranged between the reaction force projections 3 and 3 and the reaction force projections 3 and 3 are
To be integrated. Then, the slabs 2, 2 join from the expansion joint of the free structure to the expansion joint of the rigid structure, and the force is transmitted between the slabs 2, 2, so that the support in the reverse winding method is similar to the previous example. It will play a role as an engineer. Then, after the construction of the structure is completed, if the reaction force projections 3, 3 and the reinforced concrete 4 are removed, the connection between the slabs 2, 2 is again an expansion joint of a free structure.

[Effect of the Invention] As described above, the construction method of the reverse winding method according to the present invention transmits the force between the slabs through the reaction force projection formed on the slab between the slabs connected by the expansion joint having the free structure. Since the connecting material that can be used is arranged, the reverse winding method can be performed by using these slabs as support, and thus the construction work can be performed more simply than in the past because replacement beams etc. are unnecessary. Accordingly, the construction period can be shortened and the construction cost can be reduced. Also, after the construction of the structure is completed, the connection between the slabs can be made into an expansion joint with a free structure again by simply removing the connecting material, thus suppressing the transmission of force during temporary construction of water treatment facilities etc. It is suitable for the construction of the structure you want. Also, the expansion joint has a pin structure and rigid structure,
It can be used even when it is desired to suppress transmission during temporary installation.

[Brief description of the drawings]

1 to 3 show an example in which the construction method of the reverse winding method of the present invention is applied to construction of a water treatment facility such as a water purification plant or a sewage treatment plant, and FIG. 1 shows a state at the time of construction. 2, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a schematic view showing a state at the time of completion, and FIG. 4 is an enlarged view of a main part showing another example of the construction method of the present invention. FIG. 5 shows a conventional expansion joint having a free structure. 1 ... retaining wall, 2 ... slab, 3 ... reaction force projection, 4 ... jack, 5 ... reinforced concrete.

Claims (1)

(57) [Claims] In a reverse winding method in which construction work is sequentially advanced to a lower portion while supporting a retaining wall using a permanent structure, a top surface and a floor slab of the permanent structure are used as a beam or a floor slab of the permanent structure. Forming a slab provided with reaction force projections protruding outward near at least one connection end of the bottom surface, and connecting a plurality of the slabs with an expansion joint having a free structure, In addition, a connection material that enables transmission of force between slabs such as jacks or concrete is disposed, and after the construction of the structure is completed, the connection material is removed. Method.