JPH03262833A - Construction of underground floor - Google Patents

Abstract

PURPOSE:To shorten a term of work by lifting-down PC floor slabs, divided at the middle part, to a given floor to be force-added in a landslide prevention direction with a jack interposed between adjoining floor slabs, to be pressed- attached, and building an outer wall on the landslide prevention wall side of the floor slabs. CONSTITUTION:PC floor slab plates 4, previously divided at the middle part and irregular parts are provided on the outer side end part on a landslide prevention wall 1 side, are manufactured by the required number for an underground floor. Excavation is made to first underground floor, and the PC floor slab plates 4 are supported with hanging members 6 to be lifted down to the excavated ground 3' of the first underground floor. Then a jack 10 is interposed between the faced end parts of the adjoining floor slab plates 4 to be actuated, and the floor slabs 4 are horizontally force-added to the landslide prevention wall 1 side to be laterally pushed to press-attach the outer side ends of the floor slabs 4 for also using as struts. After that wall vertical reinforcements are inserted in recessed parts provided on the landslide prevention wall 1 side end parts of the floor slabs 4, and the floor slabs and outer walls 13 are integratedly built. This permits cost saving.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing a basement floor using a reverse construction method.

(Conventional technology) When constructing a basement floor, - For boat fishing, a retaining wall is constructed, piles are driven, and the floor is constructed by repeatedly excavating the retaining wall, constructing struts, and raising the floor. Excavation will be carried out to the bottom floor, and reinforcement and concrete will be placed for the frame from the bottom floor.

In addition, in the conventional reverse pouring method, the retaining walls are constructed, the structural pillars are erected, the column bases are poured, the first basement floor is excavated, the first floor floor beams are constructed, and then the first floor beams are constructed. After repeated excavation, cut beams, and erection, the excavation was carried out all the way to the floor, and reinforcement for the frame was laid out and concrete was poured from the lowest floor.

(Problems to be Solved by the Invention) In all of the above-mentioned conventional construction methods, there are ultimately unnecessary components such as struts and erecting.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to eliminate the need for temporary struts and erecting, and to quickly install floor slabs on each floor. The object of the present invention is to provide a construction method for constructing an underground floor that can shorten the construction period, save labor, and ensure safety by allowing the floor to be used as a work floor and a work passage.

(Means for Solving the Problems) In order to achieve the above object, according to the basement floor construction method according to the present invention, a PC floor slab that is divided in the middle part and has an uneven part at the end on the retaining wall side. lift down to the designated floor,
A jack is interposed between adjacent slabs of the same floor, and the jack is used to press each of the floor slabs horizontally in the direction of the retaining wall between the retainers. An outer wall is constructed on the uneven surface of each floor slab.

(Function) According to the present invention, as described above, a PC floor slab that is divided in the middle part and provided with an uneven part at the end located on the retaining wall side is manufactured in advance, and the progress of root cutting is After the same floor slabs are lifted down to a predetermined basement floor, jacks are interposed between the two adjacent bottom slabs, and by operating the jacks, each of the floor slabs is opposed to the same floor slab. By pressing horizontally in the direction of the retaining wall to press each floor slab to the retaining wall, each floor slab can also serve as a strut, and contact the retaining wall in each floor slab. By constructing an outer wall on the uneven surface provided at the end, the outer wall and each of the floor slabs are integrated (Embodiment) The present invention will be described below with reference to the illustrated embodiment.

As shown in Figure 1, retaining walls (1) and structural pillars (2) are constructed, primary excavation is carried out, and odor is detected on the excavated ground (3).
Fabricate PC floor slabs (4) for the required number of basement floors.

Each of the floor slabs (4) is divided in the middle, and an uneven part (4a) (4a i) is provided at the outer end on the side of the retaining wall, and a loose hole (4b) is bored in the vertical direction. It is anchored to the beam (5) and supported by a hanging member (6) inserted through the loose hole (4b).

In the figure, (7) is a column, (8) is a column reinforcement, and (9) is a floor slab.

Next, excavation was carried out to the first basement floor, and the PC floor slab (
4) is lifted down to the excavated ground (3') on the first basement floor, a jack (10) is inserted between the opposite ends of the adjacent PC floor slabs (4) for the first basement floor, and the jack (10) is 10) to push each floor slab horizontally towards the retaining wall (1), and push the outer edge of each floor slab (4) towards the retaining wall (1). The PC floor slab (4) on the first basement floor also serves as a cross beam.(See Figure 2 and Figures 5 to 7) Next, as shown in Figure 3, the PC floor slab (4) on the basement floor is crimped. The above-ground floor frame (11) is constructed, excavation is carried out to the second basement floor, and the PC floor slab (4) is lifted down to a predetermined level (3'l) of the second basement floor.

In addition, when constructing the outer wall (13), the floor slab (4)
The wall vertical reinforcement (14) is inserted into the recess (4a) provided at the end of the floor slab (4) on the side of the crest to integrate the same floor slab (4) and the outer wall (13). (See Figures 8 and 9) Also, underground 1: Slab reinforcement (15) between BPC floor slabs (4)
Reinforcement is arranged and concrete (16) is poured, and after the poured concrete (16) hardens, the jack (10) is removed.

Similarly to the first basement floor, on the second basement floor, the jacks (10) interposed between the PC floor slabs (4) are operated to press the PC floor slabs (4) to the retaining walls (1). It can also be used as a strut.

Next, as shown in Fig. 4, excavation was carried out to the third basement floor, and the foundation plate (17) and foundation beam (1 day) were constructed on the excavated ground (3'), and the PC floor slab for the third basement floor (4) was constructed. The building will be lowered to the third floor underground and stored on the foundation.

In addition, although the above example shows an example in which the foundation plate is constructed using a conventional construction method, the foundation plate may be made of PC, or the third floor basement slab may be pressurized by inserting jacks. Although we have given an example of a case in which walls are constructed from the upper floor, there are also cases in which only slabs are constructed at all levels and columns and walls are constructed from the lower floor.

(Effects of the Invention) According to the present invention, as described above, a PC floor slab that is divided in the middle and has uneven parts at the end on the retaining wall side is lifted down to a predetermined floor, and the adjacent floor slabs are A jack is interposed in between, and the jack horizontally cooperates with each of the floor slabs in the direction of the retaining wall, so that the PC floor slabs are crimped and supported between the retaining walls, so that the PC floor slab can also serve as a strut. By doing so, there is no need for temporary struts or erecting, and work floor passages can be obtained quickly, resulting in significant labor savings, shortening the construction period, and reducing construction costs! ! ! i can be reduced and safety can be ensured.

Further, the retaining wall side of the PC floor slab is formed into an uneven surface,
By constructing an outer wall on the same plane, the outer wall and the PC
Some are integrated with the floor slab.

[Brief explanation of drawings]

Figures 1 to 4 are longitudinal sectional views showing one implementation process of the basement floor construction method according to the present invention, Figure 5 is a cross-sectional plan view showing the construction status according to the present invention, and Figure 6 is a PC floor slab. 1 is a cross-sectional plan view showing the state in which the PC floor slab and the outer wall are crimped to the retaining wall, FIG. 7 is a cross-sectional view taken along the arrow XX in FIG. 6, and FIG. Figure 9 shows the direction of arrow Y- in Figure 8.
There is a diagram Y. (1)--Retaining wall, (3) (3'l (3') (3''1--Excavation ground, (4)-PC floor slab (4a)...Concavity, (
4a')...Protrusion, (4b)...Loose hole, (6)--hanging material, (10)--
Jyatsuki.

Claims (1)

[Claims] In the method of constructing a basement floor, a PC floor slab that is divided in the middle and has uneven parts at the end on the side of the retaining wall is lifted down to a predetermined floor, and a jack is interposed between adjacent slabs of the same floor, After each of the floor slabs is pressed horizontally in the direction of the retaining wall by the jack, an outer wall is constructed on the uneven surface of each of the floor slabs on the side that contacts the retaining wall. Underground floor construction method.