JPH01214619A - Construction method for subsurface structure - Google Patents

Abstract

PURPOSE:To assemble a subsurface structure with certainty by supporting an intermediate beam installed in a frame body of a lower beam, with a lifting jack at the time of assembling the structure, and thereby assembling the subsurface structure as adjusting a level of the lower beam. CONSTITUTION:A frame body for a lower beam 4 of a subsurface structure 12 is assembled in advance, and furthermore an intermediate beam 6 is installed in this frame body. Next, a lifting jack 13 is arranged beneath the intermediate beam 6, and leveling takes place after lifting the lower beam 4. Then, a wall panel 7 of the subsurface structure 12 is erected on the lower beam 4, the wall panel 7 is fixed thereto by an upper beam 14, and thus the subsurface structure 12 is assembled. The intermediate beam 6 and the lifting jack 13 both are removed, and the subsurface structure 12 is advanced into an underground space by a press-in jack 16 installed in the circumference of four corners of the subsurface structure 12. With this constitution, the subsurface structure 12 is accurately assembled and simultaneously its leveling can be done easily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a construction method for underground structures such as basements.

BACKGROUND ART Conventionally, as methods for constructing underground structures, there are two methods: excavating the ground and then assembling or constructing the underground structure within the ground, and assembling or installing the underground structure on the ground in advance. There is a method of draining the soil inside the underground structure while moving it into the ground.

Of these, the former method requires diagonal cuts or earth retaining to prevent the ground around the excavation from collapsing, and in the case of diagonal cuts, construction is only possible if the site is large. However, on the other hand, there are disadvantages in that applying earth retaining requires a large number of materials such as vertical sheet piles and requires a large number of man-hours. Another method is to excavate a groove in the ground corresponding only to the vertical wall portion of the underground structure and insert the vertical wall into the groove. This method has the advantage of using narrow ground and not requiring earth retaining, but it requires soil such as clay that will not collapse the groove, and cannot be used on soft ground. Therefore, the method of installing or assembling an underground structure in advance and entering it into the ground is a method suitable for soft ground, and has the advantage of being able to be constructed even on narrow sites without the need for sheet piles or earth retaining. . In this case, the underground structure is assembled on-site on the ground into which it is to be entered, and then the soil inside is drained out as it is entered. The underground structure must be assembled on a horizontal plane because it is difficult to enter the ground at an angle and to rebuild it. Therefore, as described in Japanese Patent Publication No. 60-1458, a large number of sleepers were installed on the ground.
One idea is to assemble an underground structure by attaching a standing wall to the staging after the top end of the sleeper is exposed horizontally and staging is assembled on the sleeper.

Problems to be Solved by the Invention However, as described above, in the method of installing sleepers on the ground and assembling staging on top of the sleepers, in the case of the method of removing the soil below and entering the underground structure, The sleepers can be removed when removing the sleepers, but in the press-in method, where the entire sleeper is first press-fitted before the soil is removed and the soil inside is then discharged, the weight of the underground structure rests on the entire sleeper. Because of this, it is extremely difficult to remove the sleepers.

This invention eliminates such drawbacks and eliminates the need for difficult work such as removing the railroad ties in a press-in construction method in which an underground structure is first press-fitted and then the soil inside is discharged. This is a realization of the construction method for the structure.

Means for Solving the Problems In order to achieve the above object, the construction method of the present invention assembles a frame body of a lower beam (4) constituting a part of an underground structure (12) on the ground, and After attaching one or more intermediate beams (6) inside the body, lifting the entire frame using a lifting jack (13) installed below the intermediate beams (6), and adjusting its level. , characterized in that after the underground vertical wall (7) is fixed to the frame and the underground structure (12) is assembled, the intermediate beam (6) and jack (13) are removed and the structure is allowed to enter underground. It is.

Effects According to the present invention, since the assembly is performed while maintaining the horizontal state using the jack (13), it is possible to prevent the entire assembly from tilting during assembly.

EXAMPLE Hereinafter, the construction method of the present invention will be explained in accordance with the construction order.

First, as shown in FIG. 2, four concrete weight bodies (1), (1), etc. are installed corresponding to a portion of each corner of the underground structure. This weight body (1) may be formed by pouring concrete at the installation location on site. Notches (2) (2) are cut out at right angles along the line.

Next, as shown in FIG. 3, the notch (2) of the weight (1) is
(2) Using ... as a standard, install the rectangular lower beam (4) in a frame shape. As shown in Figure 7, this lower beam (4) is made of H-beam steel installed with its flange in the vertical direction, and the lower end of the H-shaped steel is installed along the lower beam (4). A wedge-shaped entry blade (5) is fixed together by welding or the like. A plurality of intermediate beams (6) (6) are installed inside the lower beam frame (4), and a plurality of lifting jacks (13) are installed below the intermediate beams (6).
(13) and this jack (13) (13
) by placing the intermediate beams (6) (6) on top of the jacks (13) (13) and adjusting the height of the jacks (13) (13).
Adjust the overall level of the lower beam (4) using a jack (
13), a floor plate (17) is installed below it so that it does not sink downward due to the load. As shown in Figure 7,
The middle beam (6) (6) is made of H-beam steel, and its end is connected to the bolt (19) (18), which protrudes from the inner surface of the lower beam (4). ) is removably fixed.

After constructing the lower beam (4) as described above, wall panels (7) (7) made of PC board are placed on the lower beam (4).
..., connect them to each other, fix their lower ends to the lower beam (4), and construct the standing wall (8) (Fig. 5). As shown in Fig. 7, the wall panel (7) At the lower end notch (9), a longitudinal channel-shaped fixed beam (1
0) is buried in advance, and this fixed beam (10) and the web of the lower beam (4) are fixed with bolts (11).

Next, as shown in Fig. 1, the upper beam (14) is attached to the upper end of the standing wall (8), and each wall panel (7) (7)...
・The upper ends are interconnected to form an underground structure (12)
Assemble. Also as shown in Figure 7, the upper beam (14)
The H-shaped steel is installed with its flange facing vertically, and in its web, a fixed beam (lO) is similarly buried in the upper end notch (9) of the wall panel (7).
It is fixed with bolts (11). A bracket (15) is fixed to a portion of each corner of the upper beam (14), and the bracket (15) and the concrete weight body (1) are connected to each other via a press-fitting jack (16).

When the preparation for press-fitting the underground structure (12) is completed as described above, first, the lifting jacks (13) supporting the intermediate beams (6) (6) are operated to lift the underground structure (12). is lowered and the entry blade (5) at the lower end of the lower beam (4) enters the ground to support the entire underground structure (12) by the ground, and then the intermediate beam (6) is removed, Remove the lifting jack (13).

Next, as shown in Fig. 6, press the above press-fitting jack (16).
(16)... and while pulling the bracket (15) side with the press-fitting jack (16), the underground structure (12) is advanced into the ground.

Then, once you have penetrated to a certain point, Talamusiel (
20) etc. to discharge the soil inside the underground structure (12),
Again, use the press-fitting jack (16) to connect the underground structure (12).
) is advanced, the soil inside is discharged, and this process is repeated until the underground structure (12) is advanced to a predetermined position. During this approach, each press-fitting jack (16)
(16) While adjusting the amount of tension according to...
The level of the underground structure (12) is adjusted and managed so that the underground structure (12) always enters in a vertical state.

The intermediate beam (6) can be used by being attached within the upper beam (14) after the underground structure (12) is buried.

Effects of the Invention As described above, according to the present invention, when assembling an underground structure, first, the intermediate beam attached to the frame of the lower beam is supported by a lifting jack, and thereby the overall level is lowered. Adjustments are made to assemble the underground structure, and not only can the assembly of the underground structure be ensured vertically, but these lifting jacks can be easily removed by removing the intermediate beam. Therefore, compared to the conventional case where sleepers are laid under the underground structure, the removal work can be carried out warmly and easily. In addition, when the sleepers are installed in advance, it is very difficult to determine the horizontal level at the top of the sleepers, but according to this invention, the horizontal level can be adjusted extremely easily by adjusting the height of the lifting jack. There is an effect.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the underground structure assembled on the ground, Figures 2 to 5 are perspective views showing the work order from installing weights on the ground to installing wall panels, and Figure 6 7 is a vertical cross-sectional view showing the situation when the underground structure is press-fitted and the soil inside is discharged, and FIG. 7 is a vertical cross-sectional view of the main part of the underground structure. (4)...Lower beam, (6)...Middle beam, (8)
... Standing wall, (12) ... Underground structure, (13)
... Lifting jack. Patent applicant Sekisui House Co., Ltd. Representative Patent Attorney
Hisayuki Tarumoto 714 Figure 7

Claims (1)

[Claims] Assemble the frame of the lower beam constituting a part of the underground structure on the ground, and install one or more intermediate beams inside this frame, and use a lifting jack installed below the intermediate beam to After lifting the entire frame and adjusting its level, the underground vertical wall is fixed to the frame to assemble the underground structure, and then the intermediate beam and jack are removed and the system is moved underground. construction method for underground structures.