JPS6013086B2 - Construction method of underground continuous wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing an underground continuous wall, and the present invention relates to a method for constructing an underground continuous wall. The present invention relates to a method for constructing a wall that has excellent water resistance and high strength, and in particular has the composite cross-sectional performance of steel panels and concrete and the rigidity of concrete.

In recent underground construction work, construction of cast-in-place underground continuous walls has become increasingly common, and various construction methods have been proposed and put into practical use.

Conventionally, this type of construction method uses assemblies of reinforcing bars, steel frames, etc., assembled on site in order to improve the vibration resistance (seismic resistance) of the structure and increase its rigidity. Not only was it time-consuming and troublesome to create, but it also required an expanded work space due to on-site assembly.

Furthermore, when assemblies such as reinforcing rods were inserted into excavated holes, deformation of the assemblies was unavoidable, resulting in a fatal flaw of poor precision.

Furthermore, regardless of whether an underground continuous wall is used as the main structure of an underground storage warehouse, underground passage, etc., or as an earth retaining wall, the most important thing is to ensure that the wall is completely watertight. Conventional construction methods use assemblies such as reinforcing bars, so there are restrictions on deployment, and the water-stopping properties are poor, especially in the fertilized area. However, this had a negative effect on the durability and seismic resistance of the continuous wall, and in particular was not sufficient to withstand the force of mass cutting caused by Tonosho and others.

In particular, when an underground continuous wall is used as the main body of a building's basement, extremely accurate verticality is required, and a perfect wall with a water-stopping effect is required. ) is required from the perspective of saving materials and suppressing subsidence.

The present invention was devised in view of the above-mentioned technical background, and its important purpose is to provide an underground continuous wall that has complete water-tightness, and also guarantees high vertical accuracy and excellent workability. The purpose is to provide construction and construction methods.

In addition, in the present invention, the steel panel exhibits bending resistance.
A fluid filler that hardens over time, such as concrete, exhibits pressure resistance, and due to mutually complementary functions, it is possible to construct a so-called persistent underground continuous wall with excellent earthquake resistance and pressure resistance in a short period of time and with material loss. The purpose is to provide a method.

Furthermore, the present invention provides a method for constructing an underground continuous wall that can be constructed or constructed near the boundary line with an adjacent existing building and does not affect the existing building even if such construction is performed. The purpose is to

Further objects, advantages, features and usefulness of the present invention will become more apparent from the detailed description below.

In order to better understand the construction method according to the present invention, we will first explain in detail the structure of the panels produced in the factory. Figure 4 Army,
2, as shown in Figure 8, the 8th to 19th map, and Figure 19, the panel is composed of a hollow columnar part 2 and a planar connecting material 3 that connects the columnar part 2 with each other. This panel wing is used together with the formwork as the so-called interior material of the structure.

The hollow columnar part 2 is constructed by joining a pair of equilateral 1-section steel or H-section steel consisting of an equilateral flange 2A and a wave 28 by welding the flanges 2A together, etc., as shown in Figure No. 2. ``As shown in Fig. 9, it may be composed of a pair of scalene heavy steel or H-beam steel.''Also, it may be a circular steel pipe as shown in Fig. 6, or a square steel pipe as shown in Fig. 9. It's okay.

Furthermore, although not particularly shown in the drawings, it may be a so-called composite girder structure in which a pair of channel steels with lips are combined. In the case of a long span, it is made of a steel plate having a planar peak 3A as shown in Figure ★ or as a deck plate as shown in Figure 7 2, but in the case of a long span, it is made of a composite plate as shown in Figure 7 3. It may be made of resin or other plywood.

Therefore, in the most desirable embodiment, both end edges 38 of the connecting village 3 are firmly connected to the flange 2A or the web 28 of the hollow columnar section 2 by means such as welding or fastening, thereby forming at least two or more columnar sections. The panel 1 includes the section 2 and constitutes one unit of the panel 1.

Further, the connecting material 3 may be one in which a so-called arch-shaped curved ridge portion 3A is formed by molding one end of the hollow columnar portion 2, as shown in FIG. 7, an example of which is shown in FIG. In the embodiment, an engaged portion 2C is formed in the hollow columnar portion 2.

At this time, the panel aA at the so-called corner portion has an engaged portion 2C formed on the circumferential side of the hollow columnar portion 2 in a so-called orthogonal arrangement. They are competitively engaged with the engaging portion 2C in a so-called male and female configuration.
Note that the male-female relationship between the engaged portion 2C and the engaging portion 3C may be reversed from the illustrated example, and these may be arranged in the longitudinal direction of the panel ~
In other words, it is formed long in the column length direction of the columnar part 2.
The panels 1 shown in FIG. 9 may be joined together using engagement joints having the structure shown in FIG. 7. Figure 5 竃亨 2,39
4, several examples of the so-called horizontal joint structure 4, in which one unit of panel is joined in the horizontal direction, are illustrated. The joint part turtle A is formed by forming a T-shaped engaging part 48 on the corresponding web 2B and locking the two parts 4A3 and 4A3 and B with each other.

Figure 5 2 shows a male and female engaging part 4A and a turtle 8 on the edge of the flange 2A.
, and both A and 4B are locked to each other. Also"
FIG. 5 3 shows both webs 28? Circular engagement part 4A8 to honey 8
48, and "Fig. 6
A circular engaging portion 4A is formed on one web 2B, and a T-shaped engaging portion 48 is formed on the other web 2B. In addition, Figure 6 Army; 2, 3
Any joint structure 4 illustrated in 74 has a columnar part 2
It is formed in the longitudinal direction of the column, and it is possible to insert and engage one unit of panel brackets therein by sequentially hanging them. 2, a concrete example of a desired joint structure in which panels 1 are joined in the height direction is shown. In FIG. The end plates 6 are fixed by welding or the like, and the end plates 6 are overlapped and joined by bolts 7 or other means such as welding, and the cover plate 8 is attached and joined by bolts 9 or other means such as welding.

It is assumed that the end plate 6 does not close the hollow columnar portion 2 as illustrated in FIG. 61. Figure 18 1,
2, an outward flange 10 is provided on the end face of a columnar part 2 made of a circular steel pipe, and this is connected with bolts 11 or welding, and a cover plate 12 is attached and bolts 13 are attached.
Alternatively, the joint structure 5 shown in FIG. 18 can be used for the hollow columnar part 2 made of a rectangular steel pipe.

The above is the basic configuration of the panel 1 adopted in the present invention,
It is desirable to provide the panel 1 with a protrusion 14, as shown in FIG. 8, for example, in order to increase the adhesion force with the filling material.

This protrusion 14 may share a part of the bolt that joins the joint material 3 to the columnar part 2, but the joint material 3 "flange 2A"
It is also possible to provide a plurality of them at appropriate locations. Furthermore, in order to prevent the filling material from flowing into the panel 1, that is, from flowing into the horizontally adjacent panels, fins 15 are installed as shown in FIG. It is desirable to set it up as follows.

Although the fins 15 are provided on the connecting material 3, they may also be provided on the flange 2A. Also, in the installation process such as inserting or hanging the panel 1, the fins 15 can be used as guides to maintain good verticality. It is also used for maintenance. Therefore, when the fin 15 is used as a vertical guide, it is desirable to use a so-called T-shaped fin in which the portion that contacts the excavation surface 16 is planar. Furthermore, in the present invention, the continuous wall may be required to have a reinforced concrete structure, but this
As shown in FIG. 11, an assembly 17 of reinforcing bars, steel frames, etc. may be installed separately from the panel 1, but as shown in FIGS. Assembly 1
7 is fixed.

That is, the spherical engaging part 18 is integrally fixed to one or both flanges 2A of the hollow columnar part 2, or the engaging part 18 is fixedly provided to the web 2B, while the above-mentioned engaging part 18 is fixedly provided to the web 2B. The spherical engaging portions 19 inserted into the joint portions 18 are fixed together, and the assembly 20 is secured with grid-like or other reinforcement across the engaging portions 19. Therefore, in order to move the adjacent columnar parts 2 to each other, the engaging part 1 of the connecting village 3 is
9 into the joint part 18 of the columnar part 2 from the height direction,
A panel 1 having an assembly 20 on one side is constructed. Note that the male-female relationship between the engaging parts 18 and 19 shown in FIG.
The structure 19 may be the same as the transverse joint structure 4 shown in FIG. Next, the construction procedure of the present invention will be described in detail with reference to FIGS. For example, a clamshell type excavator that can maintain verticality is used to excavate to a pre-calculated depth using a stabilized liquid method.

That is, by using the stabilized liquid method, the vertical excavation hole 22 is formed while preventing the excavation surface 16 from collapsing. The specific example shown in FIG. 1 is a case where the span between the columnar parts 2 is short, and the panel 1 is inserted into the excavated hole 22 by suspending or inserting it into the excavated hole 22. Therefore, the inside of the excavated hole 22 is filled with water. The excavated hole 22 extends beyond the thickness of the pouring part 23 and reaches the hole of the hollow columnar part 2.
After that, the bottom slime is desirably removed and the flange 2A of the columnar part 2 is used as a guide (guiding the fins 15 if necessary) to insert each panel unit. Also, ``When the span between the columnar parts 2 is maximum, the second
Drill hole 22 with a shape corresponding to the panel shape as shown in Figure 0
In addition, when further reducing the amount of excavation personnel, at least the filler placement portion 23 is formed into a so-called continuous band shape to prevent collapse of the excavated surface 16 while maintaining verticality. After excavation, the panel 1 is inserted by driving its columnar part 2 into the unexcavated part. When following the insertion method shown in FIG. 21, the so-called shoe part of the columnar part 2 is used as a tip shoe, and the driving resistance is It is desirable to make it small. After forming an excavation hole 22 with a predetermined thickness and a predetermined depth, panels 1 previously prepared in a factory are joined vertically and horizontally via joint structures 4 and 5, and inserted into the excavation hole 22. A fluid and time-hardening filler 24 is installed for each panel unit, and concrete, crushed stone in some cases,
Industrial waste such as key grooves, metal calendars, artificial aggregates, etc. are preempted.
Thereafter, a fluid filling material 24 that hardens when folded is placed in the placement portion 23 on the back surface of the panel, as required by means of grating cement paste or the like. Although not particularly shown, this casting is carried out by installing a known tremie pipe in the center of each panel, and the filling 24 is placed in a "whole" manner because there is no obstacle to prevent the flow, such as a conventional reinforcing rod. It flows quickly and evenly over the entire length, forming a wall 25 which is filled with no cavities and is highly compressible, and also forms a continuous wall 25 which has good bending performance due to the steel panel i'.
In other words, the steel panel 1' itself becomes a so-called formwork that is highly waterproof. Furthermore, when the continuous wall 25 is made of a reinforced structure, it is also possible to arrange the reinforcement in the assembly 17 as shown in FIG. 11 before placing the filling material, and in the case shown in FIG. Since No. 3 mainly functions as a formwork, it can be made of plastic with good water-stopping properties.

Furthermore, since reinforcing the assembly 7 is relatively troublesome and has poor precision, it is best to use the connecting material 3 with the assembly 20 shown in FIGS. 12 and 14.

When using panel j with this assembly 2Q, the 13th
The configurations shown in FIGS. 1, 2, and 8 can be adopted.

As before, the stabilizing fluid (besotonite fluid) that overflows during the pouring process will be recovered for reuse in the next excavation.

In this way, the underground continuous wall 25 is constructed, but this continuous wall 25 is used as the main body of the underground structure (in any case where the continuous wall 25 is used as a support pile, protection wall, etc. together with the underground structure main body, the panel). The inner surface is excavated one after another while interposing supports such as struts and retaining beams between the two columnar parts.

Furthermore, Fig. 2 192 illustrates an example in which the continuous wall 25 is used as the main wall of the underground structure 26. 2
FIG. 2 shows an example in which the supporting force is expected.

That is, when the supporting capacity is expected, a filler 24 is also driven into the hollow columnar part 2 and used as a pile 27, as shown in FIG. In both cases shown in Fig. 2 1 and 2, it is recommended that the slag of the underground structure be supported with separate support piles 28.Also, in both cases 1 and 2 of Fig. When the continuous wall 25 is used as the main body of the underground structure 26, a so-called negative bending moment acts at a position corresponding to the slag.

That is, as shown in FIG. 16, when the slugs 29 are rigidly connected using the inner surface of the columnar part 2 of the panel 1 to form a rigid frame structure, a negative bending moment acts on the position corresponding to each slug. , it is recommended to deal with this by using elastic composites, interrupted composites, and assemblies 17 or 20 such as reinforcing bars. Further, in the corner portion of the underground structure 26, the male-female joining means 2C, 3C shown in FIG. 10 or the joining means shown in FIG. 17 can be used.

As stated above, the present invention provides the following advantages.

In the present invention, the steel panel 1 is made up of the columnar part 2 and the member 3 that connects the columnar part 2, and the inner surface is entirely surrounded by the surface of the panel. Since the manufactured panel 1 is inserted into the excavated hole 22 maintaining its verticality, there is an advantage that the panel 1 can be inserted accurately without deformation or warping during the insertion process.

In other words, since reinforcing bar keys are conventionally used, this becomes an obstacle to the flow of the filling material, creating cavities in the wall and causing local structural defects.In addition, the reinforcing bar keys are distorted and bent when inserted, resulting in vertical problems. However, in the present invention, water-stopping properties are good and verticality can be maintained, whereas this could not be expected. Furthermore, the present invention allows the steel panels 1 to be easily and accurately connected vertically and horizontally while maintaining high vertical accuracy, which is a significant advantage compared to the conventional method of connecting reinforcing bar dragons.

Furthermore, in the present invention, the casting portion 23 on the back side of the panel
The filling material 24 is cast in this area, but there are no obstacles to prevent the flow of the filling material 24, so there are no localized cavities such as those in reinforcing bars, and the casting capacity of the filling material 24 is small. ``By mutually complementing the compressive force of the filler 24 and the bending force of the panel i, it is possible to construct a very strong continuous wall 25, and the wall thickness is also about 1/2 that of the conventional example. Since the thickness is only 1/3, the underground space can be expanded accordingly.

In addition, the inner surface of the panel 1 is exposed, and the hollow columnar portions 2 can be effectively used as joints with the slugs 29, etc., and the span between the columnar portions 2 can be designed with a high degree of freedom. Moreover, the columnar part 2 can be used as a columnar structure, and since it is handled as a panel 1, it can be transported individually, which not only greatly shortens the construction period, but also saves space because there is no need to assemble it on site. It turns out.

In addition, the continuous wall 25 can be constructed close to the site boundary line, making effective use of the land.
According to the second feature of the assembly 20, in addition to the above-mentioned advantages, the continuous wall 25 can be made into a so-called reinforced structure with higher strength and can withstand bending force, and in any case, the finish can be improved. A continuous wall 25 can be constructed with little variation in accuracy.

[Brief explanation of drawings]

The figures show examples of the present invention, and Fig. 1, 2, and 3 are planar explanatory diagrams explaining the construction order, and Fig. 2, 1 and 2 are explanatory diagrams of two examples of basements constructed using the same construction method. , Fig. 3 is a sectional view taken along line A-A in Fig. 2 2, Fig. 4 1 and 2 are detailed views of the main parts of two examples of steel panels, and Fig. 5 1, 2, 3, and 4 are lateral views of the same panels. Detailed views of the joint parts; Figures 6, 1, 2, and 3 are detailed views of the vertical joints of the same panel; Figure 7, 1, 2, and 3, are details showing three examples of connecting materials as constituent members of the panel. Fig. 8 is an overall plan view showing an example of panel assembly, Fig. 9 is a plan view of a structure using a continuous wall as an example of a short span, and Fig. 1
Figure 0 is a detailed view of the corner part, Figure 11 is a partial view of a continuous wall exemplified as a long span, Figure i2 is a detailed view of an assembly attached to a steel panel, and Figures 13 1, 2, 3 is a plan partial view of a continuous crab using the same, FIG. 14 is a perspective view of a connecting member with an assembly, FIG. 15 is a detailed elevational view of the present invention used as an underground structure, and FIG. 16 is a FIG. 17 is a detailed view of the corner portion of the continuous wall according to the present invention using steel pipe materials, FIG. 20 and 21 are explanatory plan views showing two other examples of excavation according to the present invention. 1...Panel, 2...Hollow columnar part" 3...Connecting material, 16.
... Excavation surface, 21...Construction part 22...Drilling hole, 23...Concrete part, 24...Filling material, 25...Continuous wall. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 4 Figure 5Figure 5Figure 5Figure 5Figure 6Figure 6Figure 8Figure 6Figure 7Figure 7Figure 7Figure 9Figure 11Figure 10Figure 12Figure 13Figure 13 Fig. 13 Fig. 15 Fig. 16 Fig. 18 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 17

Claims (1)

[Scope of Claims] 1. A step of vertically excavating the underground continuous wall construction portion 21 while preventing collapse of the excavated surface 16 and including at least the filler placement portion 23; and at least two or more hollow columnar portions. 2, 2 and a planar connecting material 3 that connects the columnar parts 2, 2 to each other.At least the connecting material 3 of the panel 1 is made to correspond to the filler casting portion 23, and the panel 1 is inserted into the excavation hole 22. a step of inserting; then, the filling part 2
3. A method for constructing an underground continuous wall, comprising the steps of: 3. placing a fluid filler 24 that hardens over time; 2. A step of vertically excavating the underground continuous wall construction portion 21 while preventing the collapse of the excavation surface 16 and including at least the filler placement portion 23; A reinforcing bar assembly 20 is attached to at least the joining material 3 of the panel 1, which is made up of a planar joining material 3 that connects the sections 2 and 2, facing the filling part 23, and the reinforcing bar assembly 20 is inserting the panel 1 into the excavated hole 22 by aligning the panel 20 with the filler placement portion 23;
Thereafter, a step of pouring a fluid filler 30 that hardens over time in the filler placement portion 23; and; a construction method for an underground continuous wall.