JP4365349B2 - Steel connection wall member joint, protective device in the vicinity of the joint, and construction method of underground continuous wall - Google Patents

Description

  The present invention relates to a joint of a steel continuous wall member used for constructing an underground continuous wall, a device for protecting the vicinity of the joint from a fluidized solidified material, and a method for constructing an underground continuous wall using the device.

  There are so-called SMW method, TRD method, CSM method, reinforced concrete underground continuous wall method, steel underground continuous wall method, etc. as methods for building underground continuous walls. There are ones in which a soil cement wall is formed in the groove, and ones in which a solidified fluid such as soil cement or concrete is filled in the excavation groove formed in the ground. In these wall bodies, continuous wall members made of steel materials having an H-shaped cross section are built according to the design. This steel continuous wall member has a joint, and the joint has a hollow inside and a joint formed so as to be inserted into the hollow joint. Steel connecting wall members are connected.

  As described above, in the method of constructing the underground continuous wall by fitting the steel continuous wall members between the joints, the construction process of the underground continuous wall is temporarily suspended depending on the situation at the construction site and the reason for the process. May be suspended or work may be suspended for several days to a long time. In this case, it is difficult to build adjacent steel continuous wall members or connect the joints by solidifying the fluidized solidified material filled in or around the joints of the steel continuous wall members. Or there is a problem that it becomes impossible.

For such a problem, JP 2001-254352 A (Patent Document 1) proposes a joint protection member, and inserts the joint protection member into a hollow joint of a steel continuous wall member. A method for preventing the fluidized solidified material from flowing into the joint and solidifying is described. Furthermore, in the [0020] column of FIG. 1 and FIG. 7, it is mentioned that the solidified material adhering to the vicinity of the outer periphery of the hollow joint is removed with a peeling tool such as a chisel or a wire brush.
JP 2001-254352 A

  According to the apparatus of Patent Document 1, it is possible to prevent the fluidized solidified material from flowing into the hollow joint and solidify, but while cutting the already solidified solidified material such as soil cement or concrete. It is difficult to remove the solidified material up to the hollow portion of the joint without damaging the hollow joint, which is almost impossible in an actual construction site.

  The problem of the present invention is that, even when the fluidized solidified material of the underground continuous wall constructed previously is hardened, it does not damage the joint of the steel continuous wall member that has already been built, and is made of adjacent steel. To provide a joint, a protective device in the vicinity of the joint, and a method for constructing an underground continuous wall that enable the continuous wall member to be built.

In order to solve the above-mentioned problem, in the present invention, the fluidized solidified material in and near the joint of the steel continuous wall member embedded in the fluidized solidified material is formed in order to form an underground continuous wall. Accordingly, a method of constructing underground continuous walls to protect joints and joints near such connection does not become difficult or impossible with joint subsequent steel continuous wall members, like flow of the steel connecting wall member A protection device comprising a step of building in a excavation groove filled with a solidifying material, an insertion shaft portion inserted into the joint, a guide groove forming portion connected to the insertion shaft portion, and an angle regulating member is built. And when the fluidized solidified material has hardened to a predetermined hardness, the protective device is removed to form a cavity in the joint of the steel continuous wall member in the cured fluidized solidified material and communicate with the cavity. A guide groove to be formed and then adjacent Forming a ground excavation groove reaching the guide groove by cutting an end of the hardened fluidized solidified material, and forming an adjacent steel continuous wall member as the cavity. A method for constructing an underground continuous wall, comprising the step of fitting into the guide groove and building in the excavation groove .
The protection device of the present invention is pulled out after the fluidized solidifying material is hardened in the excavation groove filled with the fluidized solidified material, with the insertion shaft portion held in the state of being inserted into the joint of the steel continuous wall member. Therefore, the inside of the joint can be formed in a hollow state without being filled with the fluidized solidifying material. Further, since the guide groove forming portion is continuously provided on the insertion shaft portion, a guide groove communicating with the hollow portion inside the joint is formed in the fluidized solidified material after curing. Therefore, when forming the adjacent underground continuous wall, it is not necessary to cut the end portion of the already solidified fluidized solidified material so as to contact the joint of the steel continuous wall member, so that it reaches the guide groove. Just cut. Adjacent steel continuous wall members may be built along the guide groove by fitting the joint into the hollow portion, and efficient erection work is possible. Furthermore, guide grooves can be formed at a desired angle in the fluidized solidified material after curing by the angle regulating member.

  The protective device of the present invention can be provided with a lifting prevention means for preventing the protective device installed in the joint of the steel continuous wall member from floating in the fluidized solidified material.

The present invention is a method for constructing an underground continuous wall by connecting steel continuous wall members with joints in a fluidized solidified material, wherein the steel continuous wall member is filled with a fluidized solidified material. A step of installing in the groove, a step of providing the protective device according to claim 1 or 2 inside the joint of the steel continuous wall member, and the protective device when the fluidized solidified material has hardened to a predetermined hardness. To form a cavity in the joint of the steel continuous wall member in the hardened fluidized solidified material and to form a guide groove communicating with the cavity, and then to form an adjacent underground continuous wall At the time, a step of cutting an end portion of the hardened fluidized solidified material to form an excavation groove reaching the guide groove in the ground, and fitting an adjacent steel continuous wall member into the cavity and the guide groove Including undergrounding in a ditch How to build a connection wall is provided.
According to the method of the present invention, even when the construction process of the underground continuous wall is interrupted in the middle, the underground continuous wall constructed previously forms a cavity or guide groove in the joint of the steel continuous wall member. Therefore, even when the excavation groove is formed in the ground adjacent to the previous underground continuous wall, there is no damage to the joint of the steel continuous wall member that has already been built. It is possible to build an adjacent steel continuous wall member along the guide groove, and therefore, it is possible to construct the underground continuous wall relatively easily next to the already hardened underground continuous wall.
The step of building the steel continuous wall member in the excavation groove filled with the fluidized solidifying material, and the step of providing the protective device according to claim 1 or 2 inside the joint of the steel continuous wall member Any process may be performed first.

  According to the present invention, even when the previously constructed underground continuous wall is already hardened, it is relatively easy to install the steel continuous wall member for the construction of the underground continuous wall adjacent thereto. It is possible to construct an adjacent underground continuous wall efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a front view of a joint protective device 10 according to the present invention. The joint protective device 10 is a joint of steel continuous wall members embedded in a fluidized solidified material such as soil cement to form an underground continuous wall. It is a device that protects the inside and the vicinity of joints. In other words, in the process of forming the underground continuous wall, when the fluidized solidified material of the underground continuous wall constructed earlier is cured, the steel continuous wall member located at the end of the existing underground continuous wall This device protects the inside and the vicinity of the joint.
In this joint protection device 10, a pair of protection pipes 11 (insertion shaft portions) are connected by an angle regulating member 12, and as shown in FIGS. 2 (a) to 2 (c), in the material axis direction of the protection pipe 11. A guide groove forming plate 13 (guide groove forming portion) is integrally attached. Here, FIG. 2A is a front view of the protection pipe 11, FIG. 2B is a cross-sectional view along the line AA, and FIG. It is a side view when doing.

  Steel joint wall members 50a and 50b to which the joint protection device 10 of the present invention is applied have joints 52a and 52b that can be fitted to both sides of the flange 51 of a steel material having an H-shaped cross section, as shown in FIG. Use things. The joint 52a is formed in a cylindrical shape having a cavity 53 therein and a slit 54 extending in the material axis direction, while the joint 52b is formed in a shape that can be inserted into the cavity 53 and the slit 54 of the joint 52a. Examples of such steel continuous wall members include NS-BOX (GH-R) and (GH-I) manufactured by Nippon Steel Corporation.

Hereinafter, each structure of the joint protection apparatus 10 is demonstrated in detail.
The protective pipe 11 is formed from a tubular body having a diameter as large as possible within a range that can be inserted into and removed from the joint cavity 53 of the steel continuous wall member 50a. The tip 11a is formed in a sharp shape so that it can be easily inserted into the joint cavity 53, and a slit 11b (see FIG. 2B) is formed at the upper end of the protective pipe 11, and the chucking plate 14 is formed in the slit 11b. The attachment portion 14a is fixed by welding. A lifting prevention member 15 is fixed to the chucking plate 14 by a screw or the like, and this lifting prevention member 15 is screwed into a protruding portion 55 (see FIG. 4) projecting from the joint 52a of the steel continuous wall member 50a. It is fixed by etc.

  The guide groove forming plate 13 extends in the direction of the material axis of the entire length of the protective pipe 11. The width W of the guide groove forming plate 13 shown in FIG. 2 (c) may be approximately 100 to 150 mm or more, and the thickness may be equal to or greater than the thickness of the flange 51 of the steel continuous wall member 50a. It is preferable to provide a through hole 13a in the vicinity.

  The angle restricting member 12 is attached to the guide groove forming plate 13 as shown in FIGS. 1 and 4, and the guide groove forming plate 13 is disposed on an extended surface of the flange 51 surface of the steel continuous wall member 50a. As described above, the installation angle of the guide groove forming plate 13 is regulated. As shown in FIG. 5, for example, the angle restricting member 12 can be made of a steel material having an I-shaped cross section having a web 12a and a flange 12b, and a mounting hole 12c formed in the flange 12b. It can be fixed to the through hole 13a of the guide groove forming plate 13 with a bolt 16 or the like.

  Next, the construction method of the underground continuous wall using the joint protection device 10 will be described with reference to FIGS.

In the construction method according to the present invention, the excavation groove is formed and filled with a fluidized solidifying material such as soil cement, or the soil cement wall is formed in the excavation groove by in-situ stirring, and then the steel continuous wall member is formed. When building and building the underground continuous wall, when the work is temporarily interrupted, as shown in FIG. 6A, the guide 52 in FIG. 2 is placed inside the joint 52a of the steel continuous wall member 50a. The protective pipe 11 with the groove forming plate 13 is separately built, and the rising prevention members 15 (see FIG. 1) are respectively provided on the protruding portions 55 (see FIG. 4) projecting from the joint 52a of the steel continuous wall member 50a. Fix it. The work of installing the protective pipe 11 into the joint 52a and the work of fixing by the lifting prevention member 15 are performed either before or after each steel continuous wall member is built in the fluidized solidified material.
Then, on the ground, the pair of guide groove forming plates 13 are connected by the angle regulating member 12. The angle regulating member 12 is fixed to the guide groove forming plate 13 with a bolt 16 or the like. At this time, the angle of the pair of guide groove forming plates 13 is restricted by the angle restricting member 12 and is disposed on the extended surface of the flange 51 surface of the steel continuous wall member 50a as shown in FIG.

  Next, when the fluidized solidifying material 61 such as soil cement is cured, the joint protection device 10 is pulled out from the fluidized solidifying material 61, and as shown in FIG. 6B, the cavity 62 in the joint 52a, A guide groove 63 communicating with the cavity 62 is formed.

  Next, when construction work for the underground continuous wall is resumed and the underground continuous wall is constructed at a position adjacent to the existing underground continuous wall 64, as shown in FIG. 65 is formed. In the excavation process of the excavation groove 65, the end portion 66 of the hardened fluidized solidified material 61 is scraped down to the guide groove 63. Thus, since the guide groove 63 communicating with the cavity 62 is formed in the previous underground continuous wall 64, there is no need to cut into the joint 52a of the steel continuous wall member 50a already built. The adjacent excavation groove can be formed without damaging the joint 52a.

  Next, the solidified material such as soil cement is filled in the excavation groove 65, and a steel continuous wall member 50b is newly installed. In this erection process, the erection operation is performed while fitting the flange 51 and the joint 52b of the steel continuous wall member 50b into the existing guide groove 63 and the joint cavity 62, respectively. Thus, since the underground continuous wall constructed previously is formed with the guide groove 63 and the joint cavity 62, the steel continuous wall member 50b can be built relatively easily. After the construction of the joint between the existing underground continuous wall and the new underground continuous wall is completed, the excavation process, the fluidized solidification material filling process, the steel continuous wall member installation process, etc. are repeated, A medium continuous wall is constructed.

In the construction method of the underground continuous wall according to the present invention, instead of the joint protection device 10 described above, only a conventional protective pipe is installed in the joint 52a inside the joint 52a of the steel continuous wall member 50a. After the hollow portion is formed and the fluidized solidified material is cured, a water jet cutting device may be inserted into the hollow portion, thereby forming the guide groove.
In addition, it is also possible to use a fluid bag 68 having a cross-sectional shape similar to that of the protective pipe 11 with the guide groove forming plate 13. As shown in FIG. 7, the fluid bag 68 has a cylindrical portion 68a and a plate-like portion 68b that are integrally formed. After the fluid bag 68 is inserted into the joint 52a, a fluid such as water or air is introduced into the fluid bag 68. An angle regulating member (not shown) is attached to the upper end of the plate-like portion 68b.

It is a front view of the joint protection device concerning the present invention. (A) is a front view of the protective pipe which comprises a joint protective device, (b) is sectional drawing along the AA line, (c) is a side view when a protective pipe is rotated about 90 degrees. It is a top view for demonstrating the steel continuous wall member which comprises an underground continuous wall. It is a top view of FIG. It is the side view and top view of an angle control member which comprise a joint protection apparatus. (A)-(d) is a top view for demonstrating the construction process of an underground continuous wall. It is sectional drawing which shows other embodiment of a joint protective device.

Explanation of symbols

10 Joint protection device 11 Protection pipe (insertion shaft)
DESCRIPTION OF SYMBOLS 12 Angle control member 13 Guide groove formation plate 15 Lift prevention member 50a Steel connection wall member 50b Steel connection wall member 52a Joint 52b Joint 61 Fluidized solidified material 62 Cavity in joint 63 Guide groove 65 Excavation groove

Claims (2)

The inside of the joint of the steel continuous wall member embedded in the fluidized solidified material in order to form the underground continuous wall and the fluidized solidified material in the vicinity of the joint consolidate, so that the joint of the subsequent steel continuous wall member A construction method of an underground continuous wall that protects the joint and the vicinity of the joint so that the connection of the steel is not difficult or impossible, and the steel continuous wall member is built in the excavation groove filled with the fluidized solidifying material. A step of installing a protective device comprising an insertion shaft portion to be inserted into the joint, a guide groove forming portion and an angle regulating member connected to the insertion shaft portion, and the fluidized solidifying material When the hardness is hardened, the protective device is removed to form a cavity in the joint of the steel continuous wall member in the hardened fluidized solidified material and to form a guide groove communicating with the cavity, and then adjacent When forming the underground continuous wall, Cutting the end of the fluidized solidified material to form a drilling groove reaching the guide groove in the ground, and fitting an adjacent steel connecting wall member into the cavity and the guide groove in the drilling groove A method for constructing an underground continuous wall characterized by comprising a step of erection . In the step of installing the protective device, the lifting prevention member provided on the chucking plate attached to the insertion shaft portion is fixed to the joint of the steel continuous wall member, and the protective device is placed in the fluidized solidified material. The construction method of the underground continuous wall according to claim 1, comprising a step of preventing the surface from floating .

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