JPS60133117A - Method of constructing joint part of continuous underground wall - Google Patents

Abstract

PURPOSE:To shorten the projecting reinforcing bars of preceding construction, by a method wherein, after lapped reinforcing bars are engaged with longitudinal member between a reference steel pile having guide longitudinal member and reinforcing bars, erected in a groove hole in an underground wall part, concerte is poured in a groove hole. CONSTITUTION:After a reference steel pile 1 having a partitioning plate 11 is erected in a reference pile hole A, concrete 4 is placed in the partitioning plate 11, and a filling material 5 such as gravel is charged to the outside of the partitioning plate 11. Thereafter, when a groove hole B in an underground wall part is excavated, the filling material 5 is removed, and thereafter, general reinforcing bars 2 are erected in the groove hole B. An engaging part 31 of a lapped reinforcing bars 3 is engaged with the T-part of a guide longitudinal member 12 of the reference steel pile 1 and is sunk as it is slid. After the lapped reinforcing bars 3 is erected as it is positioned in the reference steel pile 1 and the general part reinforcing bars 2, the concrete 4 is poured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a joint portion of a continuous underground wall.

There is a method of constructing and covering underground walls for temporary earth retaining and water shielding.

This continuous underground wall must ensure the transmission of shear force by sufficiently integrating the various walls at the joints.

For this purpose, a method has been adopted in which the ends of the reinforcing bars of each interior wall are overlapped at the joints of each interior wall.

For example, as shown in Figure 10, the underground wall S constructed in advance
Insert the reinforcing bar t in a wrapping manner around the reinforcing bar S exposed from the end of
This means that the following underground wall will be constructed.

The longer the lap length of both reinforcing bars is, the better the integrity of each wall will be.

However, in reality, if the reinforcing bars S of the preceding underground wall S are left exposed for too long, there is a high possibility that the reinforcing bars S will be damaged when excavating a trench to construct the bottom of the following underground wall. Therefore, there is a limit to the actual lap length.

Also, in the method of first building reference piles laterally and constructing an underground wall between the reference piles as in the embodiment of the present invention, the protruding reinforcing bars of the reference piles and the reinforcing bars of the underground wall are connected for the same reason. It is difficult to extend the lap length sufficiently, and unreinforced concrete sections may be created within the continuous underground wall.

The present invention was made to improve the problems described above, and the protruding reinforcing bars of the previously constructed structure
It is an object of the present invention to provide a method for constructing a joint part of a continuous underground wall that is short enough not to affect the excavation of the underground wall that follows, and that can transmit the shearing force applied to the underground wall. .

That is, in the present invention, between the standard pile steel with the guide vertical member attached to the side surface and the general reinforcing bar installed in the groove of the underground wall part,
Concerning a method for constructing a joint part of a continuous underground wall, which is carried out by fitting the fitting part of the lap reinforcing bar that overlaps the two into the guide vertical member and sinking it, and then pouring concrete into the groove in the underground wall part. It is.

Next, an embodiment of the present invention will be described based on the drawings. The continuous underground wall according to the present invention is constructed by constructing a plurality of reference piles in advance, and then constructing an underground wall between the reference piles. This is a construction method that completes a continuous underground wall.

Here, the standard pile steel 1 is built in the standard pile hole A, the general reinforcing bar 2 is built in the underground wall groove hole B, and the lap reinforcing bar is wrapped around both the standard pile steel 1 and the general reinforcing bar 2. 3 will be explained.

(B) Standard pile steel (Figure 1) The standard pile steel 1 is a vertically long box-shaped member made of two partition plates 11 made of steel plates facing each other and connected near both ends with two cross members. be.

In addition to steel plates, the cross members may also be reinforcing bars as shown in Figure 9.

Furthermore, from the partition plate 11, a cross section T is taken along the longitudinal direction of the partition plate 11.
A letter-shaped guide vertical member 12 is provided to protrude, and a large number of shorter dowel reinforcing bars 13 are provided to protrude from both ends of the guide member 12 in the same direction.

Further, as long as the guide vertical members 12 are sandwiched between the dowel reinforcing bars 13, a plurality of guide vertical members 12 may be provided protrudingly.

(b) - Crotch reinforcing bars A conventional reinforcing bar part is used as the general part reinforcing bar 2.

(C) Wrap reinforcing bar The wrapped reinforcing bar 3 is a vertically elongated reinforcing bar section provided with a fitting part 31 in the longitudinal direction that fits into the guide vertical member 12 having a T-shaped cross section.

Its structure is, for example, as shown in Fig. 2, in which a U-shaped member a is provided with a transverse Hb in which two L-shaped protrusions are protruded from opposite each other, and a plurality of vertical members C are used to store multiple shelves. They are connected in a vertical shape to form a vertical structure.

Then, a fitting part 31 is defined as a vertically continuous space between the cross member and two L-shaped protrusions protruding therefrom, and a lap reinforcing bar 3 is attached to the T-shaped part of the guide vertical member 12. This is the part that slides into place.

The horizontal dimension of the U-shaped member a is the fitting part 31.
is fitted to the guide vertical member 12, - when the crotch reinforcing bar 2 is erected, the wrap length β of the dowel reinforcing bar 13 of the reference pile steel 1 and the lap reinforcing bar 3, - the end of the crotch reinforcing bar 2 and the lap reinforcing bar 3, and the distance m between the dowel reinforcing bar 13 and the end of the general reinforcing bar 2. (Fig. 3) Next, a method of constructing a joint part of a continuous underground wall using each of the above-mentioned members will be explained.

(B) Construction of standard piles A standard pile hole A is excavated using a conventional excavation method, such as using an excavator such as a reverse circulation drill, and partitioned in a direction perpendicular to trench hole B in the underground wall section that will be constructed later. Board 1
The standard pile steel 1 is built into the standard pile hole A so that the concrete pile 4 is located between the partition plates 11 using the conventional method.
A filler material 5 such as gravel is placed outside the partition plate 11. (Figure 4) As described above, the reference pile A part that sandwiches the trench B in the underground wall part is constructed.

(B) Excavation of the underground wall portion (Fig. 5) After the pair of reference piles A are completed, a trench hole B in the underground wall portion is excavated using a conventional method, for example, using an excavator such as a clamshell Barakerato.

At the same time, the filler 5 outside the partition plate 11 is also removed.

At this time, since the guide vertical member 12 protrudes more toward the underground wall than the dowel reinforcing bar 13, the excavator does not touch the dowel reinforcing bar 13 and the dowel reinforcing bar 13 is not damaged.

(c) Setting up lap reinforcing bars The general section reinforcing bars 2 are built in the trench where the excavation of the 8 sections of the underground wall has been completed and the slime treatment has been completed. (Figure 6) Next, standard pile steel 1
Fit the fitting part 31 of the lap reinforcing bar 3 into the 1-shape part of the guide vertical member 12, slide it and sink, and the lap reinforcing bar 3
erect it while positioning it between the standard pile steel 1 and the general reinforcing bar 2. (Fig. 7) The lap reinforcing bars 3 used at this time are those with the necessary wrap length determined by the distance between the end of the crotch reinforcing bars 2 and the dowel reinforcing bars 13 (m in Fig. 3). .

(d) Concrete pouring After the lap reinforcing bars 3 have been erected, concrete 4 is poured in the same manner as before, such as by inserting tremie pipes. (8th
(Figure) Since the method of constructing the joint part of a continuous underground wall of the present invention is as explained above, the following effects can be expected.

(b) Since the lap reinforcing bars wrap around both the standard pile steel and the general reinforcing bars, the dowel reinforcing bars of the standard pile steel can be short, and since the guide vertical members protrude from the dowel reinforcing bars, the following The dowel reinforcing bar will not be damaged by the excavator during excavation.

(b) Since lap reinforcing bars of the required dimensions can be used depending on the spacing between dowel reinforcing bars and general reinforcing bars, there is no unreinforced concrete area between the standard pile and the underground wall, and shear force is reliably transmitted. Ru.

(c) The guide vertical members not only have the function of simply fixing the lap reinforcing bars to the reference pile steel, but also have the function of protecting the dowel reinforcing bars during go-around excavation, and also serve as vertical guides for the excavator and as a guide on the partition plate surface. It is extremely useful as a guide for cleaning tools during cleaning.

[Brief explanation of drawings]

Fig. 1.2: An explanatory diagram of the standard pile steel used in the present invention. Fig. 2: An explanatory diagram of the lap reinforcing bars used in the present invention. Fig. 3. Figures 4 to 8: Explanatory diagram of the construction procedure Figure 9: Explanatory diagram when reinforcing bars are used as cross members Figure 10: Explanatory diagram of conventional joint parts 1: Standard pile steel 2. General section reinforcing bar 3. Niratubu reinforcing bar 4: Concrete 5: Filler 11: Partition plate 12 Ni guide vertical column 13 Nijibel reinforcing bar 31: Fitting part A: Reference pile hole Ba1l hole

Claims (1)

[Claims] A guide vertical member is attached to the side surface of the standard pile steel, and a fitting portion of the lap reinforcing bar that overlaps between the standard pile steel and the general reinforcing bar installed in the groove of the underground wall. A method of constructing a joint part of a continuous underground wall by fitting the guide vertical members and letting it sink, and then pouring concrete into the grooves in the underground wall part.