JPH0796773B2 - Sheet pile for forming concrete retaining wall and method for forming concrete retaining wall using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) The present invention forms a continuous concrete retaining wall in the soil for the purpose of dam foundation, embankment leakage prevention, collapse prevention, or abutment protection for iron bridges, etc. The present invention aims to provide a sheet pile having a new structure for the purpose of providing a new method for forming a concrete retaining wall using the sheet pile.

(Conventional technology) If a continuous concrete retaining wall is formed in the soil for the purpose of preventing the leakage of water from the embankment, preventing the collapse of the embankment, preventing the collapse of the embankment, or protecting the abutments of iron bridges, etc. The sheet pile of is piled up, and the soil is stopped by making it continuous, and the portion of the soil protected by the sheet pile is dug down,
After forming a space in the soil for forming a retaining wall, concrete was poured into the same place to form a continuous concrete retaining wall.However, in the previous method using this sheet pile, the soil There is a problem that excavation work must be performed, and it has always been a big problem in terms of work efficiency and work safety.

In particular, when working on the embankment itself or inside the embankment, there is a great concern that excavation of soil will lead to the collapse of the embankment, and there is a problem that it cannot be excavated carelessly. If you try to form a retaining wall in the water, even if you surround the abutment with a sheet pile and excavate the surrounding soil while scratching the water, and then concrete is placed in the sheet pile, This involves the complexity of the work of placing concrete after laying a perfect system in balance with the water that enters, and therefore leaking water from the river like around the ceiling river. Even in such areas, it has been difficult to take sufficient measures against water leakage so far, and the reality is that we cannot rely on the reinforcement of the abutment that has become lean over the years. It has been faced.

In order to deal with such an actual situation, the present invention has been earnestly developed and researched for many years, and as a result, finally, a concrete retaining wall forming sheet pile having a novel structure composed as described in detail below. , And a new method for forming a concrete retaining wall using the same is completed, and the details of the construction will be provided below.

(Structure of the Invention) First, the structure of the concrete retaining wall forming sheet pile of the present invention will be explained.

As can be clearly understood from the embodiment representative of the present invention shown in the overall perspective view of FIG. 1, the concrete retaining wall forming sheet pile of the present invention corresponds to the thickness and depth of the retaining wall to be formed. A sheet pile body 1 having a length and a predetermined unit width
The fitting concave groove 2 is formed on one side edge, and the fitting convex strip 3 having the concrete press-fitting hole 4 is formed on the other side edge over the entire vertical length thereof. While forming the shape, the concrete outlet 6 opened downward is formed at a proper position on the upper side of the inclination of the bottom edge 5 formed in the shape of the cutting edge, and the concrete outlet 6 is fitted with the fitting convex strip. Three
It is basically formed by a structure in which it is connected to the lower end of the concrete press-fitting hole 4 formed in 1. and the open surface of the concrete outlet 6 is covered with a driving protection lid 7 which can be opened and closed.

The sheet pile main body 1 is formed of a robust steel plate, and is formed in a hollow rectangular tube shape to secure a predetermined thickness as in the illustrated embodiment, but is not shown.
For forming a curved retaining wall, the entire planar shape can be formed as an arc shape.

The hollow portion 11 may be used to appropriately install a vibrator so as to promote press fitting of the sheet pile. Further, in the case of a sheet pile having the structure having the hollow portion 11, the structure may be such that a partition rib is provided by a reinforcing rib (not shown) to reinforce the member facing the hollow portion. Is.

The fitting groove 2 and the fitting ridge 3 formed on both side edges of the sheet pile body 1 are shown as circular in horizontal cross section in the illustrated embodiment, but are of dovetail cross section. Any cross-sectional structure may be used as long as they can be fitted to each other and hold the connected state. Further, since the angle is changed for each sheet pile to be connected, the side edges may be angled.

The shape of the cutting edge formed on the bottom edge 5 of the sheet pile body 1 is for facilitating press-fitting of the sheet pile into the soil, and as shown in FIG. 2, the side where the fitting groove 2 is formed. It has an inclined side surface from the lower edge of the edge to the lower edge of the side edge where the fitting projection 3 is formed, and in a vertical cross-sectional shape along the side edge, it has a V-shape as shown in the left side view of FIG. It is desirable that the so-called overall shape is formed into a substantially cutting knife shape.

The bottom edge 5 is inclined upward, and in the illustrated embodiment, the portion that is biased toward the fitting protrusion 3 side is connected to the lower end of the concrete press-fitting hole 4 formed in the fitting protrusion 3 and opened downward. The concrete outlet 6 is formed, but if the sheet pile is driven in with this structure, the concrete outlet 6 is formed.
Since dirt and gravel, etc. may become clogged in and the concrete may not be poured smoothly while pulling out the sheet pile, a driving protection cover 7 for protecting the open surface of the concrete outlet 6 is provided in parallel. It is something.

As shown by the broken line in FIG. 2, the driving protection lid 7 has an end edge on the fitting concave groove 2 side formed on the pivoting portion 71 so that the fitting convex strip 3 side can be opened and closed. It

Next, a method for forming a concrete retaining wall using the concrete retaining wall forming sheet pile of the present invention having the above structure will be described according to the steps.

[First Step] First, the first concrete retaining wall forming sheet pile P1 is hung by a crane or the like, and is placed in a substantially vertical state by a known means such as placing or vibration press-fitting, or press-fitting using them together. Drive to the specified depth.

At that time, when the sheet pile main body 1 is formed to be thick and has a structure having a hollow portion 11, a vibrator is appropriately inserted into the hollow portion 11 in order to enhance the driving effect, and the driving is performed by press fitting or other means. To do so.

[Second Step] The lower end of the fitting groove 2 of the second sheet pile P2, which is substantially vertical, is aligned with the fitting projection 3 of the first sheet pile P1 driven in the first step. Of the sheet pile P1 is used as a guide, and the second sheet pile P2 is placed or vibration press-fitted so that they are connected to each other by a known method such as press-fitting or vibration press-fitting. Hit it.

In the same manner, the third, the fourth ... Retaining wall forming sheet piles P3, P4 ... are sequentially connected and driven in the same manner. The sheet piles P1, P2, ... Connected in this manner are shown in the plan view of FIG. 7 and the front view of FIG.

For connecting the second and subsequent sheet piles P2, P3, ... To the first sheet pile P1, the fitting projections 3 of the first sheet pile P1 are used as guides as described above, and the second, third, ... Of the sheet piles P2, P3 ......, the fitting ridges 3, 3 ...... are driven in as guides, and, on the contrary, the sheet piles P1, P2 ...... which have been already driven, respectively.
Of course, it is also possible to use the fitting concave grooves 2, 2 ...

[Third step] After at least the third sheet pile P3 starts to be driven in the second step, the concrete is press-fed through the concrete press-fitting hole 6 while applying vibration to gradually pull out the first sheet pile P1. Pile concrete 8 into the soil from which sheet pile P1 itself has fallen out. This state is shown in FIG.
In the figure, 9 indicates a concrete pumping hose.

In the following, the second and third sheet piles P2, P3, ... are also pulled out in the same manner, and concrete 8 is pumped and placed,
A continuous concrete retaining wall will be formed.

[Fourth step] The sheet piles P1, P2 ... Extracted in the third step are sequentially fed to the sheet pile used in the second step and used as the driving sheet pile.

After that, a continuous concrete retaining wall is formed in the soil by repeating the second and subsequent steps.

(Effects) The concrete retaining wall forming sheet pile of the present invention having the above-described configuration has dimensions corresponding to the thickness and depth of the retaining wall to be formed, and is formed to have a unit width. Therefore, the shape and structure are relatively simple, and it is only necessary to manufacture a large number of the same products, and therefore, it can be provided at a lower cost.

Further, since the bottom edge 5 of the sheet pile is formed into a substantially cut-out knife shape, it is easy to drive the concrete, and the concrete discharge outlet 6 is provided with the driving protection lid 7 on the open surface thereof. The concrete 8 can be pumped from the press-fitting hole 4 without any trouble.

On the other hand, if the side edges of the sheet pile are formed at an angle, not only a straight retaining wall but also a zigzag or non-straight retaining wall can be easily formed. If it is formed in a circular arc shape, it can be used as a retaining wall forming sheet pile for reinforcing abutment.

When a desired retaining wall is formed using this concrete retaining wall forming sheet pile, it requires excavation to form a space for concrete placing, as in the case of forming by simply driving a conventional sheet pile. Therefore, there is no need to treat the remaining soil, which is very advantageous in terms of workability.For example, when forming a retaining wall as a leak stop for a dike, weaken the location during the construction stage. Since it has the characteristic that there is no danger that it will end up, it will be the most suitable sheet pile for the levee leak prevention work around the big city where there is a house immediately on the side of the levee.

On the other hand, the method of forming the retaining wall using this characteristic sheet pile is
Since the same sheet piles P1, P2 ... are driven one after another while driving is performed, there is no risk of misalignment in the forming position, and moreover, one side has already been driven in parallel with the driving of the sheet pile. The concrete is being pumped and placed while pulling out the sheet pile with vibration.
Concrete retaining walls that are continuously cast and formed at locations where the positions of the sheet piles P1, P2 ...
Naturally, it is formed according to the plan, and the vibration at the time of pulling out exerts the compaction effect of concrete pouring, which ensures the realization of a solid retaining wall.

In addition, since the driving of the sheet pile and the driving of the concrete are performed in parallel in this way, the working efficiency is naturally increased, and it can be said that the construction method can sufficiently cope with the leakage stop work in the emergency. The sheet piles P1 and P2 required at that time
The amount of ...... is theoretically at least 3 because the pulled-out sheet piles can be turned one after another into the driving sheet piles.
Since it is possible to form any retaining wall if one sheet pile is prepared, it is possible to form any retaining wall desired with extremely few sheet piles, and it is possible to implement economical construction. is there.

No special construction machine is required for the work of placing the sheet piles P1, P2 ..., and the pile placing machine that has been used up to now can be used as is, or according to the plane section of the sheet piles P1, P2 .... It is possible to easily implement by simply improving and combining appropriate jigs such as head protection jigs.
In this respect as well, it can be an economical construction method.

As described above, the concrete retaining wall forming sheet pile of the present invention and the method of forming a retaining wall using the same are extremely economical and highly safe, and work efficiency is higher than that of the conventional type. It has the excellent feature of being high,
It can be said to be the most suitable for ground protection work and ground strengthening work such as leakage prevention of rivers around the big city that gradually transforms into a ceiling river due to accumulated sediment etc. and reinforcement of abutment part over national roads with heavy traffic.

[Brief description of drawings]

The drawings are based on an embodiment representative of the present invention. FIG. 1 is an overall perspective view of a sheet pile of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a left side view of the same, and FIG. The figure is a right side view, FIG. 5 is a plan view, FIG. 6 is a bottom view, FIG. 7 is a plan view showing a connected state, and FIG. 8 is a front view.
FIG. 9 is a front view showing one aspect in the construction process. 1 ... Sheet pile main body, 11 ... Same hollow part, 2 ... Fitting concave hole, 3
...... Mating recessed line, 4 ...... Concrete press-fitting hole, 5 ...... bottom edge, 6 ...... Concrete spout, 7 …… Driving protection lid, 71 …… Pivoting part, 8 …… Pasting concrete, 9 …
… Concrete pumping hoses, P1, P2 …… The sheet pile of this invention.

Claims (2)

[Claims] Claim: What is claimed is: 1. A sheet pile body having a retaining wall to be formed and a length corresponding to a depth and having a predetermined unit width, one side edge of which has a fitting groove and the other side edge thereof. A fitting convex strip having a concrete press-fitting hole formed over the entire vertical length thereof is formed so that the bottom edge further has a blade edge shape, while the bottom edge formed in the blade edge shape is inclined downwardly at a proper position in the upward direction. An open concrete outlet is formed at the bottom, and the concrete outlet is connected to the lower end of the concrete press-fitting hole formed in the fitting ridge, and the open surface of the concrete outlet is opened with a driving protection lid that can be opened and closed. A sheet pile for forming a concrete retaining wall as if it were covered. 2. A sheet pile body having a thickness and a depth-corresponding length to be formed and having a predetermined unit width, one side edge of which has a fitting groove and the other side edge thereof. A fitting convex strip having a concrete press-fitting hole formed over the entire vertical length thereof is further formed so that the bottom edge has a blade edge shape, and the bottom edge formed in the blade edge shape is inclined at a proper position above and upward. Forms a concrete outlet that is open downward, connects the concrete outlet to the lower end of the concrete press-fitting hole formed on the previous fitting ridge, and protects the open surface of the concrete outlet so that it can be opened and closed. A method for forming a concrete retaining wall, in which a plurality of concrete retaining wall forming sheet piles covered with a lid are prepared and the concrete retaining wall is formed in the soil by repeating the procedure including the following first to fourth steps. [First Step] First, the first concrete retaining wall forming sheet pile is hung by a crane or the like, and placed in a substantially vertical state by a known means such as placing or vibration press-fitting, or press-fitting by using them together. Drive to the depth. [Second Step] The fitting ridge (or fitting) of the second sheet pile, which is substantially vertical to the fitting groove (or fitting ridge) of the first sheet pile driven in the first step. (Concave groove) Align the lower ends and use the fitting concave groove (or fitting ridge) of the first sheet pile as a guide, and place or squeeze into the second sheet pile so that they are connected, or It is driven to a predetermined depth below the ground surface by a known means such as press-fitting in combination with. Hereinafter, similarly, the third,
4th .... Driving while connecting the concrete retaining wall forming sheet piles in sequence. [Third Step] In the second step, after at least the third sheet pile is started to be driven, while applying vibration to gradually pull out the first sheet pile, concrete is pressure-fed by appropriate means through the concrete press-fitting hole, and the first sheet pile is firstly punched. Concrete is placed in the soil from which the sheet pile itself has fallen out. In the same manner, the second and third sheet piles are also drawn out in the same manner by pumping and placing concrete to form a continuous concrete retaining wall. [Fourth Step] The sheet pile extracted in the third step is sequentially fed to the sheet pile used in the second step. After that, a continuous concrete retaining wall is formed in the soil by repeating the second and subsequent steps.