JPH0361807B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a continuous deep foundation construction method.

Conventional technology As is well known, the deep foundation method is a method in which, for example, when constructing a foundation structure, a circular hole of a certain diameter is manually dug in the ground, the hole is dug down while being stopped, and then concrete is poured. This is a method of constructing a desired foundation structure, etc.

A liner plate is often used for this mountain stop, and the liner plate is generally used as a circular unit. Therefore, construction of continuous structures is not possible.

Therefore, these conventional deep foundation construction methods are disadvantageous both in terms of time and economy.

Problems to be Solved by the Present Invention The problem to be solved by the present invention is to be suitable for construction work in mountainous areas where the allowable work space is limited and, for example, it is impossible to bring in large construction machines, and without having the above-mentioned drawbacks. The objective is to provide a deep foundation construction method that allows extremely efficient and continuous construction.

Means for Solving the Problems The continuous deep foundation construction method according to the present invention involves interposing a half ring-shaped plate between its two opposing ends with an intermediate plate serving as a shear member for resisting earth pressure. Continuous excavation is performed using liner plates that are connected together by connecting members provided at the positions where they are joined, and after excavation, the intermediate plates are sequentially dismantled and removed, and a structure is constructed within the formed cavity. It is characterized by

Function The construction method according to the present invention is also applicable to constructing curved structures, and in this case, the liner plate is formed as a curved liner plate by changing the radius of curvature of the half ring shape.

Furthermore, in order that the continuous deep foundation construction method according to the invention can be carried out with advantageous protection against earth pressure, a liner plate constructed as follows, i.e. a connecting intermediate between each of the two half-rings to be connected; In order to bridge and reinforce these sections, it is also possible to use a liner plate reinforced by providing turnbuckles in parallel with an intermediate plate that serves as a shearing material.

By using a liner plate with such a structure, that is, an extremely rigid liner plate, the safety of the liner plate against earth pressure loads and ground collapse is guaranteed, and therefore the safety of the work space is also ensured, making work safer. It is possible to proceed to

Furthermore, in addition to the above, the construction method according to the present invention is extremely effective by changing the thickness of the liner plate used and adding support in order to further ensure safety during construction. It is also possible to carry out the work under favorable earth pressure conditions.

Embodiments Below, embodiments of the liner plate used in the present invention illustrated in the accompanying drawings will be described in detail.

In FIG. 1, reference numeral 1 designates a portion of a liner plate according to the invention. Here, half-ring-shaped plates 2, 3, 4, 5... (the number of plates can be connected even n depending on the length of the construction section) are connected to each end B...M A member 7 (FIG. 3) is provided. With this connecting member 7, each of the above-mentioned ends is connected at position A (FIG. 1) in a combination of B-C, D-E...K-J and M-L,
These ends are connected by interposing an intermediate plate 6 which serves as a strut. This connection is effected by fastening each end of the plate together with the intermediate plate 6 by means of bolts 9, 9', 9'' attached to the profile 8, as shown in FIG.

The embodiment shown in FIG. 1 is a linear liner plate. Each of the plates 2, 3, 4, . . . constituting the liner plate 1 has the same radius of curvature. This liner plate 1 is therefore straight and continuous.

The liner plate according to FIG. 2, designated as a whole by the reference numeral 10, consists of half-annular plates 2', 3', 4'... having different radii of curvature. The succession of these plates therefore has a curved shape, which is useful for excavating curved sections.

As shown in FIG. 4, in places where extremely large earth pressure is expected, the edges of each plate, for example B- A turnbuckle 40 is provided parallel to the intermediate plate 6 between the intermediate plate 6 and the intermediate plate 6. By tensioning the turnbuckles 40, rigidity is imparted to the liner plates 1, 10, and lowering of the liner plates due to earth pressure is avoided.

A construction example of the method according to the present invention will be described below.
FIG. 5 is a diagram showing an example in which the construction method according to the present invention was carried out using the above-mentioned liner plate 1. In this case, Figure 5a is a cross-sectional view of the working area;
Figure b shows a plan view. As shown in this figure, the construction involves continuous excavation of deep foundation piles (reference number 21 for the excavation position), and after excavation, the intermediate plate (cutting material) is dismantled and removed. While backfilling with material) (reference number 20),
This is done by sequentially removing the liner plate 1 from the bottom.

FIG. 6 is a diagram showing an example of construction when constructing an underground dam. In this construction example, first, according to the general construction procedure, excavation is started from the upper surface 33 of the ground, the excavation is continued down until reaching the foundation position 35, and after reaching the foundation position 35, while dismantling and removing the intermediate plate, concrete is poured into the cavity. Concrete structure 36 is constructed by using a concrete structure 36, and other excavation sections are made of impermeable material (e.g. clay).
34, 34' and permeable material (e.g. sandy soil) 3
Backfill with 7.

FIG. 7, like FIG. 6, is an example in which the present invention is applied to foundation construction in dam construction. The work procedure in this construction example is the same as in general. Reference number 2
2 is a dam embankment, 23 is a wall constructed by the construction method according to the present invention, and 24 is a foundation.

The construction method of the present invention is not limited to the above construction example, but is suitable for construction of any linear or curved foundation structure.

Effects The construction method according to the present invention provides the following advantages, for example, when constructing an underground dam: - It is possible to excavate while observing the surrounding ground, and it is relatively easy to deal with geological changes. - Base rock ● Structures (for example, water intakes) can be built inside the mine as necessary. ● Even if cavities are encountered, they can be disposed of easily. ●Since large machinery is not used, there are fewer restrictions due to the topography, and water-stop walls that suit the topography can be built. ●Construction can be carried out without noise or vibration.

Such effects are achieved not only in the above-mentioned construction examples, but also in construction examples according to the invention for other similar structures.

[Brief explanation of drawings]

1 shows linearly connected liner plates used in the method according to the invention, FIG. 2 shows curved liner plates used in the method according to the invention, and FIG. 3 shows a method according to the invention. Fig. 4 shows the connecting portion of each plate constituting the liner plate used in the method according to the present invention, and Fig. 5 shows the liner plate used in the method according to the present invention provided with a reinforcing member.
Figures a and b are diagrams showing a construction example in which embankment construction was performed using a liner plate using the construction method according to the present invention, and Figures 6 to 7 are diagrams showing other construction examples using the construction method according to the present invention. The symbols in the figure are 1... liner plate, 2,
3, 4, 5... Plate, 6... Intermediate plate (cutting material), 7... Joint part, 40... Turnbuckle, 10... Curved liner plate, B to M
...Plate end.

Claims (1)

[Claims] 1 In the continuous deep foundation construction method, an intermediate plate 6 is interposed between the two opposing ends B to M of the half-ring-shaped plates 2, 3...5 as a shearing material to counter earth pressure, and both ends are Continuous excavation is performed using a liner plate that is integrally connected by a connecting member 7 provided at the position where parts B to M are joined (position A), and after excavation, the intermediate plate 6 is sequentially dismantled and removed. A continuous deep foundation construction method characterized by constructing a structure 30 within the formed cavity.