JPH01165819A - Construction of steel sheet pile wall - Google Patents

Abstract

PURPOSE:To construct a steel sheet pile wall in precise and less-expensive manner, by using a plurality of guide piles equipped with steel-sheet-pile claws, without employing guide frames composed of guide piles and guide beams. CONSTITUTION:First of all, a plurality of guide piles 1, sufficiently longer than steel sheet pile 2 and having steel-sheet-pile calws 1a along the axial direction, are prepared. On the normal line of placing of these steel sheet piles 2, the guide piles 1 are driven into the ground 15 at intervals of integer-fold of the width of the steel sheet pile 2, leaving a prescribed length protruding above the ground surface. The steel sheet piles 2 are driven in thereafter, having them engaged to the claws 1a of the guide pile. With this method, guide piles for temporarily-placed guide frames will not be required to be prepared separately as conventionally done so, and time and labor for installing and removing them can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of constructing a steel sheet pile wall used for seawalls, embankments, erosion control dams, etc.

[Conventional technology]

Worked on laying steel sheet piles used for seawalls, embankments, etc. In this case, a guide frame arranged along the normal line of pouring is usually used.

As shown in Figure 12, the guide frame usually has a conductor 1 made of H steel columns.
4 are driven at predetermined intervals, and guide beams 13 such as channel steel are fixed to the conductive resistors 14 in one or two stages horizontally in the normal direction of the sheet piles. There are two ways to drive steel sheet piles: one is to drive the steel sheet piles one by one from one side along the guide frame that has been assembled in this way, and the other is to drive the steel sheet piles after a certain section has been erected continuously. It is known as a folding screen.

In the case of single driving, the nails of the sheet pile are driven only on one side, so the driving resistance becomes unbalanced, and it is inevitable that the steel sheet pile will tilt in the normal direction. Therefore, in order to correct the inclination before it becomes too large, measures have been taken to appropriately insert irregularly shaped sheet piles formed at an inverted angle.

Folding screen driving was devised as a method to prevent tilting as much as possible when driving steel sheet piles, and in this method, the first
As shown in Figure 2, 10 to 20 steel sheet piles 2 are piled in succession, and after driving 2 to 3 sheets on both sides to a specified depth in advance, the middle steel sheet piles are divided into 2 to 3 steps. It is something that you type in.

[Problem that the invention seeks to solve]

In the case of folding screen driving, it is possible to drive with relatively high accuracy compared to single driving, but because the rigidity of the steel sheet piles on both sides that serve as guides is weak, the steel sheet piles tend to twist and tilt as they are driven, making it difficult to achieve sufficient accuracy. It is difficult to secure this, especially when trying to obtain a closed cross section such as a circle or square 1 surrounded by a steel sheet pile wall by joining the starting and ending ends of a steel sheet pile wall, it is necessary to use irregularly shaped sheet piles. I didn't get it.

In addition, when driving the steel sheet piles, a separate conduction resistance of 14° was applied.

This invention solves the problems of the conventional method by making the conductor function as a part of the steel sheet pile wall.

To provide an accurate and economical construction method for steel sheet pile walls.

[Means for solving problems]

The present invention involves preparing a plurality of guide piles that are sufficiently longer than the length of the steel sheet piles and having steel sheet pile claws attached along the axial direction, and placing the inner claws of the adjacent guide piles on the driving normal of the steel sheet pile wall in advance. After arranging the guide piles so that the spacing is an integral multiple of the width of the steel sheet piles, they are driven into the ground leaving a predetermined ground surface height, and then a large number of steel sheet piles are erected by fitting into the claws of the guide piles. This method of constructing a steel sheet pile wall is characterized by successively driving the steel sheet piles in multiple steps to a predetermined depth.

〔Example〕

1 to 11 are drawings showing embodiments of the present invention.

FIG. 1 is a drawing showing an example of constructing a rectangular steel sheet pile wall enclosure, in which a plurality of guide piles 1 are arranged in a predetermined direction in the steel sheet pile driving direction. The steel sheet piles are driven at intervals of , and the steel sheet piles are driven along the positions indicated by dotted lines.

Figure 2 shows guide piles, and Figure 3 shows various examples of steel sheet piles. Guide pile 1 is made of steel pipes ((a), (b)
(Fig.), H-shaped steel (Fig. (C)), channel steel (Fig. (d)), etc. are used, and the claws 1a that fit with the steel sheet piles 2 to be driven along the longitudinal direction are moved in the driving direction of the steel sheet piles. Weld.

In other words, in the part where the driving normal of the steel sheet pile 2 is a straight line, for example, the second
The claws 1a are made to protrude in the direction of θ=180@ on both sides of the guide pile 1 shown in FIG. 2(a), and the claws 1a are made to protrude at an angle of θ=90° shown in FIG. 2(b) at a part of the corner.

Steel pipes, H-shaped steel, channel steel, etc. used for guide pile 1 are as follows:
If a steel sheet pile with a too small cross-sectional shape is used, it may deform when the steel sheet pile 2 is driven.
0m or more, 250φ or more for steel pipes, 250φ or more for H-beam steel
50 x 250 or more, 250 x 12S for channel steel
It is preferable to use the above.

In addition, the length of the guide plate 1 is such that, with the tip penetrating the steel sheet pile driving depth, the protrusion height from the ground surface is sufficient to accurately guide and drive the steel sheet pile 2 and to stabilize it after construction. The length is required, and it is desirable that the length be approximately 1.5 times or more the length of the poured steel sheet pile 2.

Figures 4 to 7 show a spacing holding frame 3 used when driving guide piles in places where the driving normal line of steel sheet piles 2 is straight, and can be used as a guide frame during erection and subsequent driving of steel sheet piles. It also has the following functions.

This spacing frame 3 is manufactured by combining H-shaped steel, etc., and one side of the frame 3 has upper and lower cross beams 4 as shown in FIG.
．． 5 and the left, right, and central vertical members 6 form a rectangular frame, and diagonal members 7 are provided at the center and part of the lower corners of the upper cross beam 4 for reinforcement. A pair of frames configured in this manner are arranged at a distance necessary for erecting the steel sheet piles 2 and guide piles l, and are arranged with connecting members 8 at the four corners as shown in FIGS. 6 and 7. It is fixed with bolts and nuts.

In between the left and right vertical members 6, a guide claw 10 is attached parallel to the vertical members 6 toward the center of the frame at the center of the frame interval with a spacer 9 interposed therebetween. This claw lO is designed to fit into the claw 1a provided on the side surface of the guide pile 1 and drive the guide pile 1 while vertically guiding it at predetermined intervals, so that the guide pile 1 does not tilt. It needs to be the same length. Note that this claw lO is bolted to the spacer 9 and is detachable.

The spacing between the guide claws 10 provided on the left and right vertical members 6 of the spacing frame 3! , In order to erect and drive steel sheet piles 2 continuously between guide piles 1, it is necessary to accurately determine the inner claw interval 2 of guide piles 1 to be an integral multiple (n) of the sheet pile width B. There is.

For this purpose, ffi,=nB+2Nb shall be.

Here 2. is the interval between the claws 1a provided on both sides of the guide pile 1. Steel sheet pile 2 to be driven between two guide piles 1
The number of lines, that is, the value of n, is usually preferably about 5 to 30.

A spacer 11 for erecting steel sheet piles is attached to the inside of the upper cross beam 4 of the spacing frame 3.

This is to ensure that the steel sheet piles are held in position accurately when the steel sheet piles 2 are erected because the frame spacing is too wide.

FIGS. 8 to 10 show a spacing holding frame 3a for driving guide piles in a part of the corner shown in FIG. 1. At a part of the corner, the claws 1a of one guide pile 1 are attached at an angle of θ=90', so the guide claws 10 provided on the spacing frame 3a also need to match the direction of the guide pile 1.

That is, as shown in FIG. 10, a spacer 9 is provided on the side surface of the vertical member 6, and the pawl is mounted in such a position that it fits into the pawl 1a of the guide pile 1.

The other structure is the spacing frame 3 used for the straight section.
It is similar to

A method of constructing a steel sheet pile wall using the above-mentioned apparatus will be explained with reference to FIGS. 11(a) to (6).

In Fig. 11(a), first level the ground surface horizontally, install the spacing frame 3 of the guide pile l at a predetermined position, and then use the claws 1a provided on the side of the guide pile 1 with the first grain, which will be the starting point. , while fitting into the claws 10 of the frame 3,
Drive the steel sheet pile to a depth close to the driving depth, and then insert the nail 1a of the guide pile 1 with the second grain into the nail 1a on the opposite side of the spacing frame 3.
Drive to the specified temperature while mating.

Alternatively, after driving the guide pile 1 with the first grain to a predetermined depth, insert one claw 10 of the spacing frame 3 into the guide pile 1.
After the guide pile 1 with the second grain is fitted into the other claw 1a of the spacing frame 3 and installed, the guide pile 1 with the second grain may be fitted into the other claw 1a of the spacing frame 3 and driven.

In this embodiment, the guide pile 1 is approximately 2 times the length of the steel sheet pile 2.
Since it is twice as long, its ground surface height is approximately the same as that of the steel sheet pile, and the steel sheet pile 2 can be sufficiently stabilized by guiding and driving the steel sheet pile. The ground surface height will depend on the construction site conditions, but it should be approximately 2 or more of the height of the steel sheet piles.

In addition, 15 in the figure is the ground on which construction will be carried out.

Next, one steel sheet pile 2 is erected between the two guide piles l shown in FIG. Construction is carried out by fitting the nails of the sheet piles together.

Since the interval l between the inner claws 1a of the two guide piles 1 is accurately maintained by the interval holding frame 3 at several times the steel sheet pile width B as described above, the last steel sheet pile 2 is also kept close to the other guide pile. The nails can be smoothly fitted into the nails 1a and the already built steel sheet pile nails and can be built.

It is also used as a guide frame for 2.

Next, as shown in FIGS. 11(C) and (d), the continuously erected steel sheet piles 2 are driven in one after another. When driving the ball, divide it into several times to reach a predetermined depth.

When all the steel sheet piles 2 are driven to a certain extent and their self-supporting state is ensured, the spacing maintaining frame 3 is removed as shown in Fig. 11(d).
Remove. When removing the spacing frame 3, if the fit with the guide pile pawl 1a is tight, it can be easily removed by loosening the mounting bolt of the pawl 10 on the frame 3 side.

When the driving of the steel sheet pile 2 between the first and second wood guide piles 1 is completed, the first wood guide pile 1 is cut at the steel sheet pile driving height as shown in FIG. 11(e). In this case, the cut guide pile 1 can be used as a material for guide piles from the 3rd grain onward.Next, the nails are fitted to the second guide pile 1 that has already been driven in, and the next spacing maintaining frame 3 is installed. Then, fit and drive the claw of the third guide pile 1.

Next, as shown in FIGS. 11(f) and (6), steel sheet piles 2 are erected between the second and third guide piles 1 in the same manner as described above, and subsequently driven.

Thereafter, the guide piles 1 are similarly driven at predetermined intervals using the spacing frame 3, including a part of the corner, and the steel sheet piles 2 are erected and driven in sequence.

Construct steel sheet pile walls.

Note that a plurality of guide piles l may be driven in advance at predetermined intervals in the spacing frame 3, and then the steel sheet piles 2 may be erected and driven between any guide piles 1. In this case, the steel sheet piles If the guide pile 2 is to stand on its own after being erected, the guide frame is not required.If it cannot stand on its own, use the spacing maintenance frame 3 as a guide frame, or attach a cross beam to the top of the guide pile 1 and use it as a temporary guide frame. good.

〔Effect of the invention〕

As explained above, according to the construction method of the present invention, there is no need to separately provide a conductor for the temporary guide frame as in the past, and the cost of materials and the construction cost for removing the construction W can be reduced, which is economically advantageous. It is. In addition, the nails fit into the guide piles that have been caulked and driven, and the driving is done in several stages after erecting a large number of steel sheet piles, so that the steel sheet piles do not fall down during driving, and the deformed steel sheet piles can be driven. There is no need to insert or modify it. Furthermore, since the inner pawl spacing between adjacent guide piles is driven in such a way that it is an integral multiple of the steel sheet pile width, the steel sheet piles inserted between the guide piles have the effect of being able to fit the pawls with a standard width. This is particularly advantageous when building closed walls surrounded by steel sheet pile walls.

[Brief explanation of the drawing]

1 to 11 are drawings showing embodiments of the present invention,
Figure 1 is a side view showing an example of building a rectangular steel sheet pile wall enclosure, Figures 2 (a), (b), (C), and (d) are cross-sectional views showing various examples of guide piles. , Figures 3 (a) and (b) are cross-sectional views showing examples of steel sheet piles, Figure 4 is a plan view of the spacing frame, Figure 5 is a front view taken along the line B-B in Figure 4, and Figure 6 The figure is a front view taken along the line C-C in Fig. 4, Fig. 7 is a detailed view of the guide claw part in Fig. 4, Fig. 8 is a plan view of the spacing frame used for a part of the corner, and Fig. 9 is the 8th Figure 10 is a detailed view of the guide claw in Figure 8, Figure 11 (a)
-(6) are explanatory diagrams of the construction procedure for constructing a steel sheet pile wall, and FIG. 12 is a side view showing the conventional method of driving steel sheet piles (folding screen driving). ■...Guide pile, 1a...Guide pile claw, 2
...Steel sheet pile, 3.3a...Spacing maintenance frame, 4.
・・Upper horizontal beam, 5・Lower horizontal beam, 6・Vertical beam, 7・
... diagonal material, 8 ... connection material, 9 ... spacer, 10
... Guide claw, 11 ... Spacer for construction, 13
...Guiding beam, 14...Guiding beam, 15...Ground agent, patent attorney Masanobu Akisawa, 1 person, 7i1 drawing (Q), 2nd drawing, 3rd piece, 4th figure, 7r6, 78th figure, 9th drawing on the left Figure 10 Soup Figure 11

Claims (1)

[Claims] Prepare multiple guide piles that are sufficiently longer than the length of the steel sheet pile and have steel sheet pile claws attached along the axial direction. After arranging the guide pile so that it is an integral multiple of the width, it is driven into the ground leaving a predetermined ground surface height, and then a large number of steel sheet piles are erected by fitting into the claws of the guide pile, and then continued until the predetermined depth is reached. A method of constructing steel sheet pile walls that is characterized by driving steel sheet piles in multiple steps.