JP3889113B2 - Construction method of solidified water wall - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a construction method for a water blocking solidified wall.
[0002]
[Prior art]
Conventionally, a water blocking wall containing a stress member has been proposed for the purpose of preventing liquefaction during an earthquake. As the construction method of the water blocking wall, there are known an in-situ soil mixing stirring column wall method (SMW method) and an injection material mixing stirring method (TRD method). In this type of construction method, a solidified material is filled in the excavation groove and a stress member is inserted while the strength is not yet developed. A U-shaped steel sheet pile is used as the stress member.
[0003]
[Problems to be solved by the invention]
The above-described water blocking wall has the following problems.
<I> Since the stress member is inserted using a vibro hammer or the like, there remains a problem in the water stoppage of the connecting portion of the stress member.
[0004]
<B> Since a U-shaped steel sheet pile is used for the stress member, the continuity of the stress member is ensured by using a large number of adjusted steel sheet piles when the construction extension becomes long. Therefore, the construction cost is high due to the heavy use of the adjusted steel sheet pile.
[0005]
This invention is made | formed in view of the above point, The place made into the objective is to provide the construction method of the water stop solidified wall which can provide high water stop performance to the connection part of a stress member. Furthermore, the other object of this invention is to provide the construction method of the water stop solidified wall which can be constructed at low cost even if construction extension is long.
[0006]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, partitioning steel plates are arranged on both end sides in the excavation groove, and each partitioning steel plate has joints extending in the vertical direction on both sides and is located on both end sides of the excavation groove. The steel plates are connected with a frame to form an integral structure, and a water-stopping civil engineering sheet is attached to the frame between the partition steel plates, and between the joints of the partition steel plates arranged on both ends in the excavation groove. Provided is a construction method for a water-stopping solidified wall, characterized in that a solid steel sheet pile is disposed and then a solidifying material is filled between partition steel plates in a digging groove.
[0007]
Moreover, the said joint uses the pipe joint which has a slit in an axial direction, The construction method of the water stop solidified wall characterized by the above-mentioned is provided.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings.
<I> Excavation of the preceding element ditch The mud mortar replacement work, etc. will be performed as a countermeasure against the collapse of the ditch wall of the target ground.
Next, as shown in FIG. 1, the groove 1 of the preceding element is excavated by filling with the stabilizing liquid 2.
[0010]
<B> Joint structure The joint structure of the present invention comprises a partitioning steel plate 3, a joint 4, and a frame 5 as shown in FIG.
[0011]
(1) Partition steel plate The partition steel plate 3 is built in the vicinity of both ends of the groove 1 to block the solidified material filled in the preceding element from flowing into the connecting space 11 between the preceding element and the succeeding element. It is.
[0012]
The partition steel plate 3 has a width substantially equal to the width of the groove 1 and a height substantially equal to the depth of the groove 1. In addition, hard rubber may be attached to both side edges of the partitioning steel plate 3 that come into contact with the groove wall surface to improve followability with the groove wall surface to improve the water stop effect.
[0013]
(1) Joint For the joint 4, a pipe having a slit extending over the entire axial length of a tubular body having a circular cross section or a square shape is used. And this joint 4 positions a slit in the other side of the partition steel plate 3, and joins it by welding etc. over the up-down direction of both surfaces of the partition steel plate 3. FIG.
[0014]
In addition, it is good to aim at prevention of the penetration | invasion of the solidification material with which a protection tube 41 is armored in the joint 4 located in the subsequent element side of the partition steel plate 3, ie, the connection space 11, and filling a preceding element. In some cases, a water-stopping adhesive tape is attached to the slit or bottom of the joint 4.
[0015]
(3) As shown in FIG. 1, the frame frame 5 is for connecting the partition steel plates 3 built at both ends of the groove 1 to form an integral structure. For example, an angle steel material or the like is used as the frame 5, thereby connecting the side edge portions of the both partition steel plates 3 in the horizontal or oblique direction so as to be close to the wall surface of the groove 1. Further, a civil engineering sheet 51 for water stopping is attached to the frame 5 so as to stop the entire wall surface of the groove 1 between the partitioning steel plates 3.
[0016]
<C> Built-in Linear Steel Sheet Pile As shown in FIG. 2, the linear steel sheet pile 7 is a flat sheet pile, and may be a commercially available single product or a plurality of pre-engaged ones. When erected, both ends of the linear steel sheet pile 7 are inserted into the slits of the joint 4.
[0017]
The head of the linear steel sheet pile 7 may be deposited in a guide wall or the like using a turnbuckle special fixing jig. Further, if the connecting portion between the linear steel sheet pile 7 and the joint 4 is filled with a swelling water-stopping agent, the water-stopping property can be further increased.
[0018]
<D> Filling the solidified material of the preceding element Before filling the solidified material in the preceding element, as shown in FIG. 2, the crushed stone 6 is filled in the connected spaces 11 at both ends of the groove 1, and the solidified material is in the connected space 11. Make it easy to excavate even if it penetrates into.
[0019]
Next, as shown in FIG. 3, the solidified material 8 is filled between the partition steel plates 3 in the groove 1. As the solidifying material 8, concrete bentonite, cement bentonite or the like is used. These are pumped by a pump car and replaced with the stabilizing liquid 2 in the groove 1.
[0020]
<E> Construction of adjacent preceding element The adjacent preceding element is constructed at a predetermined interval as shown in FIG. 3 by the same method as described above. At this time, the distance L between adjacent preceding elements is subjected to accuracy management using a ruler and ultrasonic measurement.
[0021]
<F> Excavation of Subsequent Element Groove As shown in FIG. 4, the ground between the preceding elements is excavated to provide a groove 12, and the surface of the partition steel plate 3 exposed in the groove 12 is cleaned with a brush or the like. Next, the protective tube 41 is pulled out, and the straight steel sheet pile 71 is connected between the joints 4 by the same method as described above. And as shown in FIG. 5, the solidified material 81 is filled in the groove | channel 12, and the continuous wall body is constructed | assembled. Hereinafter, by repeating the above procedure, it is possible to construct a water-resistant solidified wall having a predetermined length.
[0022]
【The invention's effect】
Since the present invention is as described above, the following effects can be obtained.
<A> Since the linear steel sheet pile is inserted before the solidified material is filled in the excavation groove, it is not necessary to use a vibro hammer or the like, and the water stoppage of the connecting portion can be ensured.
[0023]
<B> Since a linear steel sheet pile is used, it is not necessary to use an adjusted steel sheet pile even if the construction extension becomes long, and the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a process of inserting a joint into a digging groove. FIG. 2 is an explanatory diagram of a process of inserting a linear steel sheet pile. FIG. 3 is an explanatory diagram showing the completion of construction of a preceding element. FIG. Explanatory drawing of the process of inserting a linear steel sheet pile into the excavation groove of FIG.

Claims (2)

Place partitioning steel plates on both ends in the excavation groove,
Each partition steel plate has joints over the upper and lower sides of the both surfaces , and the partition steel plates located at both ends of the excavation groove are connected by a frame to form an integral structure,
A civil engineering sheet is attached to the frame between the partition steel plates ,
After arranging a linear steel sheet pile between the joints of the partition steel plate arranged on both ends in the excavation groove,
It is characterized in that it is constructed by filling solidified material between partition steel plates in the excavation groove,
Construction method of still water solidified wall.   The construction method of the water-stopping solidified wall according to claim 1, wherein a pipe joint having a slit in the axial direction is used as the joint.

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