JP3729028B2 - Water stop method for joints in steel pipe sheet piles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a water stopping method for a joint portion in a steel pipe sheet pile.
[0002]
[Prior art]
The water stop construction method using steel pipe sheet piles stops water by placing adjacent sheet piles sequentially on both sides of the steel pipe sheet piles via joints integrated along the longitudinal direction thereof. It is a construction method. As shown in FIG. 4, the joint part used for this consists of a joint pipe 2 welded in parallel to both sides of the sheet pile main body 1 and formed with an elongated slit 2a along the longitudinal direction. The joint pipes 2 are engaged with each other in a hook shape in cross section, thereby connecting the sheet piles.
[0003]
In order to ensure the water stoppage of the joint part in this case, conventionally, after the sheet pile is built, the earth and sand clogged in the joint pipe 2 is washed and removed, and then formed into the joint pipe 2 in the engaged state. Insert the elongated bag made of non-woven fabric, etc., into the gap by selecting the large gap part of the gaps a, b, and c, and then filling the bag with mortar, so that the bag adheres inside the pipe The water was stopped.
[0004]
[Problems to be solved by the invention]
However, this water stopping method is troublesome because the internal cleaning is performed before the filling operation. In addition, when the gap between the joints cannot be secured due to the vertical accuracy of the sheet piles, the inside of the joints cannot be cleaned, the efficiency of the air lift at a deep position is reduced, or the bag cannot be cleaned sufficiently, or the bag Due to the limited insertion depth of the mortar, the mortar was not sufficiently filled. For example, in the case shown in the figure, even if it is assumed that the gap “a” is the largest in terms of visual appearance, the lower part may become gradually narrower, so the above-described problems are likely to occur. Therefore, in preparation for such a case, it is essential to ensure water-stopping by injecting a chemical into the ground on the back of the sheet pile, and the problem of incurring cost increases due to the addition of this type of auxiliary method was there.
[0005]
The present invention solves the above problems, and its purpose is to eliminate the need for cleaning for water stopping, and to ensure sufficient water stopping by filling the pipe with a solidified material. The present invention provides a water stopping method for a joint portion of a steel pipe sheet pile that can be secured.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the method of the present invention closes the bottom surface of the joint pipe connected to the steel pipe sheet pile to be built next and is formed in the vertical direction of the joint pipe among the joint pipes provided on both sides of the main body of the steel pipe sheet pile. A member that closes the slit formed is detachably arranged in the joint pipe, and after the steel pipe sheet pile is built, the joint pipe is filled with a delayed solidifying material, and then the closure member is pulled out while the closure member is pulled out. It is characterized by additionally filling a delayed solidifying material in an amount corresponding to the volume of. Therefore, according to the method of the present invention, the solidified material is reliably filled into the joint by only the delayed solidifying material filling operation and the closing member pulling operation as the work for ensuring the water stop after the placing. In addition, when the next steel pipe sheet pile is to be joined, the solidified material is not solidified, so it can be joined while it is penetrating into a fitting pipe that has been filled, and eventually the solidified material will solidify. Thus, the water stoppage of the joint portion is ensured.
[0007]
In this invention, it is simple and preferable that the closing member is a steel pipe. In addition, by providing the head for the closing member so as to be detachable, it is possible to reliably prevent the closing member from being displaced from the mounting position due to the penetration pressure when the sheet pile is driven.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a steel pipe sheet pile 10 to which the method of the present invention is applied. The sheet pile 10 includes a sheet pile main body 12 and left and right joint pipes 14 and 16 which are integrated on both sides of the main body 12 by welding or the like along the longitudinal direction thereof.
[0009]
One of the joint pipes 14 is connected to a steel pipe sheet pile to be built next, and the other joint pipe 16 is connected to a steel pipe sheet pile previously built. Each slit 14a, 16a It is formed at the diagonal position as the center.
[0010]
The bottom opening of one joint pipe 14 is closed by welding the bottom lid 18. On the other hand, the tip of the other joint pipe 16 is formed shorter by the thickness d of the bottom lid 18.
[0011]
A small-diameter pipe 20 as a closing member is inserted into one of the joint pipes 14, and is fixed to the opening position of the slit 14a by a temporary welding 22 to thereby close the slit 14a. The positions of the temporary welding 22 are appropriately spaced along the length direction, and have a sufficient fixing force against the pressure when the main body 12 penetrates into the ground. The small diameter pipe 20 can be pulled out by being easily broken by the pulling force.
[0012]
In addition to this, for example, pin insertion holes 14b and 20a pass through the upper part of the joint pipe 14 and the upper part of the small-diameter pipe 20, and a stopper pin 24 for preventing the joint from rising is inserted into the insertion holes 14b and 20a. The small-diameter pipe 20 is securely fixed at the slit position against the built-in pressure so that the breaking stress is not directly applied to the position of each weld 22.
[0013]
Next, the water stop method of the steel pipe sheet pile 10 of the above structure is demonstrated.
[0014]
First, in a state where the steel pipe sheet pile is built in the same manner as in a normal steel pipe sheet pile method, the slit 14a of one joint pipe 14 is closed by the small-diameter pipe 20, so that the water-stopping property is substantially maintained. , Earth and sand will not invade inside. In this state, as shown in FIG. 3A, the space between the small-diameter pipe 20 and the joint pipe 14 is filled with a delayed solidifying material 26 made of a cement-based material. The solidification time of the solidified material 26 is set in consideration of the continuation cycle of each steel pipe sheet pile 10.
[0015]
Next, the stopper pin 24 is pulled out, and the filling operation of the delayed solidifying material 26 is continued while pulling out the small-diameter pipe 20 using a crane or the like.
[0016]
At the time of drawing, the insertion hole 20a of the small-diameter pipe 20 also serves as a mounting hole for a connection fitting such as a shackle for hooking on a hook block of a crane. As described above, the small-diameter pipe 20 is pulled out from the joint pipe 14 while breaking the welds 22 by forcibly pulling out.
[0017]
As the small-diameter pipe 20 rises, the delayed solidification material 26 wraps around the gap after the pipe and counters the groundwater pressure, so that even in this state, the water stoppage inside the joint pipe 14 is ensured. As shown in FIG. 3B, the joint pipe 14 is filled with the solidified material 26 over the entire vertical direction.
[0018]
Then, before the solidification material 26 starts to solidify, the other side joint pipe 16 in the next steel pipe joint 10 is changed to the one side joint pipe 14 in the previously placed steel pipe joint 10 as shown in FIG. The other joint pipe 16 is inserted into the one joint pipe 14 while pushing the solidified material 26 by being built with the hook-shaped engagement.
[0019]
Since the solidified material 26 is solidified after a lapse of time, the water stoppage at the joint portion is ensured.
[0020]
【The invention's effect】
As is clear from the above explanation, the water stop method for the joint portion of the steel pipe sheet pile according to the present invention does not require cleaning as compared with the conventional water stop method, and moreover, the filler is reliably put inside the pipe. By filling, sufficient water stoppage can be secured. Moreover, since an auxiliary construction method such as chemical injection is unnecessary, the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a steel pipe sheet pile used in the method of the present invention.
FIG. 2 is an exploded perspective view of the steel pipe sheet pile.
FIGS. 3A to 3C are plan views showing a water stopping procedure and a continuation procedure using the steel pipe sheet pile. FIG.
FIG. 4 is a plan view showing a conventional joint structure of steel pipe sheet piles.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Steel pipe sheet pile 12 Sheet pile main body 14 One joint pipe 16 The other joint pipe 14a, 16a Slit 18 Bottom cover 20 Closure member (small diameter pipe)
22 Temporary welding 24 Pin 26 Delayed solidification material

Claims (3)

Of the joint pipes provided on both sides of the main body of the steel pipe sheet pile, a member that closes the bottom surface of the joint pipe connected to the steel pipe sheet pile to be built next and closes the slit formed in the vertical direction of the joint pipe is provided in the joint pipe. Placed in a removable manner,
After erection of the steel pipe sheet pile, the joint pipe is filled with a delayed solidification material,
After that, the water-stopping method for the joint portion in the steel pipe sheet pile is characterized by additionally filling the delayed solidifying material in an amount corresponding to the volume of the closing member while pulling out the closing member. The said blocking member is a steel pipe, The water stop method of the joint part in the steel pipe sheet pile of Claim 1 characterized by the above-mentioned. The method for water-stopping a joint portion in a steel pipe sheet pile according to claim 1, wherein a joint-preventing metal fitting is detachably provided on the head of the closing member.

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