JPS5921831A - Reverse placement work - Google Patents

Abstract

PURPOSE:To raise the efficiency and safety of construction work by a method in which the height of a raft floated on mud water is adjusted by varying the amount of mud water to a given height, and a mud-water excavator is set below the raft and operated. CONSTITUTION:A sheathing wall 1 and plural reversely placed pillars 2 are constructed under the ground E, and the ground F is excavated to a depth that a mud-water excavator 10 can reach by an excavator (not illustrated). Mud water 12 is charged through a hose 11 into the inside of the sheathing wall 1 and float a raft 13 on the mud water. Under the condition, the ground F is further excavated by the mud-water excavator 10, the height of the raft 13 is adjusted by the amount of the mud water 12, and cut beams 5, floor and ceilings 8, and side walls 9 are constructed on the raft 13 by workers M to complete a given structure. The needs for complicated temporary scaffolds can be eliminated, the working efficiency can be raised, and the safety of the work can also be raised because the mud-water excavator 10 is located away from workers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverse construction method for constructing a building underground or from underground to above ground, and particularly to a reverse construction method that facilitates work and improves safety.

The conventional reverse pouring method will be explained based on FIGS. 1 and 2.

According to the conventional construction method, as shown in FIG. 1, first, a retaining wall 1 and a plurality of reverse pillars 2 located inside the retaining wall 1 are constructed underground E. The retaining wall will be constructed using the same method as the known construction method for underground continuous walls. In addition, the reverse column 2 is generally made of H-shaped steel, etc., and the lower end has a via 3.
Fixed by

Next, the ground F inside the retaining wall 1 is dug using an excavator 4 such as a pack hoe or a yun r, and at the same time, the work of constructing the struts 5 between the reverse pillars 2 is proceeded from the side close to the ground. Generally, even on the ground, parallel columns 6 are added to the reverse columns 2, and normal beams 7 are erected between the columns 6 to proceed with the construction of the above-ground portion of the building.

The general method for making the sill 5 is to erect a steel frame (not shown), such as a type steel, between the reverse-strength columns 2, wrap reinforcing bars around the steel frame, and construct a formwork around it to form concrete. A method of pouring is used.

The struts 5 also function to support the earthen wall placed on the retaining wall 1.

Next, as shown in FIG. 2, while further excavation is carried out by the excavator 4, a floor/ceiling material 8, side walls 9, etc. are constructed of concrete etc. around the strut 5 near the ground.
Repeat the same work towards the underground side to complete the required structure. In addition, as the side wall 9, the retaining wall 1
There are cases where it is made separate from the wall 1, and cases where the retaining wall 1 is used as is. Further, as a method of supporting the earthen wall on the retaining wall 1, there is also a method of using an anchor or the like (not shown) in addition to the strut 5. After the construction is completed, the excavator 4, etc. is pulled up through the damaged hole.

However, according to the conventional reverse construction method described above, the worker M who constructs the struts 5 etc. has to work in parallel with the person working near the excavator 4, which increases the risk of danger. be. In addition, since the height of the five struts under construction from the excavated ground Fl will be higher, so-called temporary construction work will be required to construct appropriate work platforms and scaffolding, making the work difficult.

The present invention was made to solve these conventional problems, and an object of the present invention is to provide a reverse pouring method that is highly safe and significantly improves work efficiency.

The gist of the present invention is a step of constructing a retaining wall and a reverse pillar located inside the retaining wall in the ground, a step of digging the ground inside the retaining wall to a depth that a mud excavation machine can enter, A step of injecting muddy water into the inside of the retaining wall, a step of floating the raft on the muddy water inside the retaining wall, and a step of adjusting the amount of muddy water while excavating the muddy water with the muddy water excavation machine to increase the height after the above-mentioned height. The method includes the steps of lowering the raft one after another and constructing an inverse structure inside the retaining wall above the raft.

Hereinafter, the present invention will be explained with reference to examples shown in FIGS. 3 and 4. Incidentally, the same reference numerals are used in the explanation for the same parts as in the prior art.

In the construction method of this embodiment, as shown in FIG. 3, first, a retaining wall 1 and a plurality of reverse pillars 2 located inside the retaining wall 1 are constructed underground E using a method similar to the conventional method. .

Next, an excavator 4 such as a backhoe (see Figures 1 and 2) is placed on the ground, and the ground F inside the retaining wall 1 is dug to a depth that is approximately the same as the depth of one basement floor into which the mud excavator 10 can fit. Dig down to ).

Next, muddy water 12 is poured from the hose 11 onto the inside/side of the retaining wall 1.
is injected into the muddy water 12, and a raft 13 serving as a scaffold for work is floated on top of the muddy water 12.

In this state, the muddy water excavation of the ground F is carried out by the muddy water excavation machine 10, and the height of the raft 13 is adjusted according to the amount of muddy water 12. On the raft 13, the worker M performs the work of constructing the above-mentioned inverted structure of the struts 5 and the like. In addition, the muddy water excavator 1
The earth and sand excavated by 0 is sent to pump 1 via hose 14.
5 and sent to the sand settling tank 16. The sand settling tank 1
The muddy water separated from the earth and sand in step 6 is injected onto the ground F through the hose 11. Further, the earth and sand separated from the muddy water in the sand settling tank 16 is sent to a water separator 17, from where it is taken to a predetermined location and disposed of. Construction work for pillars 6, beams 7, etc. is being carried out on ground 2.Next, as shown in Figure 4, muddy excavation of ground F is proceeding, and at the same time, construction work is being carried out around struts 5 in the same way as before. The floor/ceiling material 8, side walls 9, etc., are constructed to complete the desired building.

After the construction is completed, the mud excavation machine 10 is pulled up through an elevator, stairs, a damaged hole, etc., and the raft 13 is disassembled and pulled up.

The muddy water excavation machine 10 can be moved by installing a direction changing rail or a lift on the underside of the raft 13, or by being loaded onto a vehicle such as an underwater bulldozer, or can be moved on the ground or on the raft 13 by a remote control device. It can also be controlled remotely from above. In this way, since the mud water excavation machine 10 does not require direct operation by a worker, unmanned construction methods are possible, especially for excavation work that tends to be delayed.
It is possible to work day and night, making it easier to level the work with the framework construction work.

As explained above, according to the present invention, the height of the raft floating on muddy water can be easily adjusted to the optimal height and used as a work platform, eliminating the need for complicated temporary scaffolding as in the past. This has the advantage of improving efficiency. Another advantage is that the mud drilling machine is located below the raft, completely away from the workers and workers, which increases safety. Furthermore, since muddy water excavation is carried out, there is also the advantage that vibration-free and noise-free construction methods are possible.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional explanatory diagrams showing the steps of the conventional reverse pouring method, respectively, and FIGS. 3 and 4 are cross-sectional explanatory diagrams showing the steps of the reverse pouring method according to an embodiment of the present invention, respectively. be. 1... Mountain retaining wall 2... Reverse pillar 5...
Stray beam (reverse-build frame) 8...Floor and ceiling material (reverse-build frame)
9... Side wall (reverse hammered frame) 10... Mud water excavation machine 1
2...Muddy water 13...Raft E...Underground
F...Ground. Patent applicant Mitsui Construction Co., Ltd. Figure 3 Figure 4 Procedural amendment February 8, 1980 Director of the Patent Office Kazuo Wakasugi 1, Indication of case Patent application No. 131548-1982 2,
Title of the invention: Reverse pouring method 3, relationship with the amended case Patent applicant: Mitsui, 3-10-1 Iwamoto-cho, Chiyoda-ku, Tokyo
Construction Representative Director and President Town Co., Ltd. 1) Ryoji 4, Agent Kimraya Otsuka Hill 6, 1-18-19 Shinbashi, Minato-ku, Tokyo
0- on floor 1, 2, 3, 4

Claims (2)

[Claims] (1) A step of constructing a retaining wall and a reverse pillar located inside the retaining wall in the ground, a step of digging the ground inside the retaining wall to a depth that a mud excavation machine can enter, and a step of constructing the retaining wall. The process of injecting muddy water into the inside of the wall,
A step of floating the raft on the muddy water inside the retaining wall, and adjusting the amount of muddy water while excavating muddy water with the muddy water excavation machine to sequentially lower the height above the raft and inside the retaining wall. A reverse construction method comprising the steps of constructing a reverse concrete structure. (2) The reverse drilling method according to claim 1, wherein the muddy water excavation machine is operated by a remote control device.