JP5348197B2 - Synthetic wall structure - Google Patents

Description

  The present invention relates to a composite wall structure including a steel retaining wall and a reinforced concrete wall used for civil engineering and building structures.

  As a method of constructing a composite wall consisting of a steel retaining wall and a reinforced concrete wall constructed by connecting steel sheet piles and steel pipe sheet piles, the steel retaining wall is first placed in the ground, and then the steel soil retaining wall is constructed. A common method is to excavate the inside of the retaining wall and weld a stopper such as a headed stud to the joint surface with the reinforced concrete wall. Has been done.

  FIG. 10 shows a composite earth retaining wall structure described in Patent Document 1, in which a steel earth retaining wall 100 is placed in the ground and the inside of the steel earth retaining wall 100 is excavated, and then the steel earth retaining wall. A plurality of anti-slipping materials 300 and anti-slipping shear reinforcement bars 400 are fixed to 100 by stud welding, and a plurality of force distribution bars are arranged to place concrete, thereby constructing a reinforced concrete wall 200.

  11 (a) and 11 (b) show a method for constructing a synthetic underground wall using a soil cement column wall described in Patent Document 2, and a short threaded bolt 600 is previously placed on the surface of the core material 500 of the retaining wall. After mounting by welding and installing the protective cap 700 on the threaded bolt 600 and constructing the soil cement column wall (FIG. 11A), the soil cement 1000 is removed to the surface of the core material 500, and the protective cap 700 is attached. The joint coupler 800 and the threaded connector 900 are sequentially attached to the threaded bolt 600 to form a slip prevention material, and then the concrete 1100 is placed (FIG. 11B).

Japanese Patent Laid-Open No. 7-310365 JP 7-48846 A

  However, the composite retaining wall structure described in Patent Document 1 shown in FIG. 10 has a plurality of misalignments after the steel retaining wall 100 is placed in the ground and the inside of the steel retaining wall 100 is excavated. The stopper member 300 and the shear-preventing shear reinforcing bar 400 must be fixed by lateral stud welding.

  Lateral stud welding has poor workability and construction quality compared to downward welding due to the fact that the working posture is sideways and the molten metal is biased under the influence of gravity. The “Guideline / Construction site construction edition 1996 revised edition” states that for lateral stud welding, it is preferably limited to studs with a shaft diameter of 16 mm or less.

  Therefore, it is difficult to apply the composite earth retaining wall structure described in Patent Document 1 to a case where the acting force becomes large and a stud having a shaft diameter of 19 mm and a shaft diameter of 22 mm is required. In addition, when the depth increases due to construction of a deep underground wall or the like, the acting force increases further, so there is a case where a stud with a shaft diameter of about 30 mm or more is required in the design. Welding is virtually impossible from the viewpoint of workability.

  In addition, the soil cement column wall described in Patent Document 2 needs to constitute a detent material by the threaded bolt 600, the protective cap 700, the joint coupler 800, and the threaded connector 900, and the number of parts is large, so the work man-hours are large. It takes a lot of work and the work at the site becomes complicated.

  Since these parts are not general-purpose products, the processing and manufacturing costs are high, and the total length of the threaded bolt 600 is relatively long at about 50 mm, so that the threaded bolt is not damaged or deformed. It is necessary to perform excavation carefully, and excavation work takes time. These disadvantages are promoted as the shaft diameter increases, and it is considered that application is difficult from the viewpoint of processing and manufacturing costs, especially when the shaft diameter is about 30 mm or more.

  Therefore, an object of the present invention is to provide a composite wall structure that solves the above problems.

The object of the present invention can be achieved by the following means.
1. A synthetic wall composed of a steel earth retaining wall and a reinforced concrete wall, and a locking bolt with a surface nut having a shaft diameter of 22 to 36 mm, which is inserted through the steel earth retaining wall, includes the surface nut and the steel earth retaining wall. It is screwed between the back nut fixed to the wall, and the bolt hole for temporary bolt used when placing the steel earth retaining wall is inserted and fixed to the steel earth retaining wall. A composite wall structure, wherein the locking bolt with a surface nut functions as a locking between the steel earth retaining wall and the reinforced concrete wall.
2. The composite steel wall according to claim 1, wherein the steel earth retaining wall is composed of a steel sheet pile having a flange portion and a web portion, and the locking bolt with a surface nut is fixed to the web portion of the steel sheet pile. Wall structure.
3. The synthetic wall structure according to 1, wherein the steel earth retaining wall is formed of a steel pipe sheet pile.

According to the present invention, the following effects can be obtained, which are extremely useful industrially.
1. For temporary bolts, permanent bolts, back nuts, front nuts, and washers, for example, commercially available bolt sets can be used, so costs can be reduced and procurement is easy. For example, the '01 Design Data Book Revised 3rd Edition 2003 ”of the Japan Bridge Construction Association includes JIS B 1180, JIS B 1181, JIS B 1256 hex bolts, hex nuts, and washers as shaft diameters of 6 mm to 80 mm. A shaft diameter of 10 mm to a shaft diameter of 36 mm is described as a high-strength bolt, nut, and washer of JIS B 1186.
2. Since the height of the head of the temporary bolt which is the protrusion and the height of the back nut are low, there is almost no resistance when the steel retaining wall is driven into the ground.
3. Further, since the temporary bolt and the back nut are fixed to the steel earth retaining wall, they hardly deform at the time of placing. Furthermore, when excavating the inside of the steel retaining wall, the height of the head of the temporary bolt is small, so that excavation work can be performed quickly.
4). Since the back nut is fixed by welding or the like, the temporary bolt can be replaced with the permanent bolt only by the work from the inside of the steel retaining wall. That is, the bolt construction from one side becomes possible.
5. Moreover, the replacement from the temporary bolt to the permanent bolt can be performed quickly and easily with high accuracy by using, for example, an electric torque wrench.
6). After excavating the inside of the steel retaining wall, it is not necessary to perform side-to-side stud welding with poor workability and construction quality, so a high proof strength can be obtained with a large diameter such as a shaft diameter of 24 mm, a shaft diameter of 30 mm, and a shaft diameter of 36 mm. Can be applied.
7). From the above, the effects of cost reduction, on-site workability and work quality improvement, shortening the work period, and improving the proof stress of the joint between the steel retaining wall and the reinforced concrete wall can be obtained.
8). Furthermore, when a plate member is added to the back surface of the steel retaining wall, when the steel retaining wall is placed in the ground, the rigidity of the steel retaining wall is increased, Deformation and buckling are prevented.
9. In addition, in a composite wall in which a steel retaining wall and a reinforced concrete wall are integrated, the plate member is on the outer edge side, so that it can efficiently resist the acting force such as bending moment due to earth pressure or water pressure. it can.
10. Even if the working force due to earth pressure or water pressure increases as the depth increases or a large force is generated locally at the joint with the slab or foundation, a plate member is installed in the part where the working force is large. This can partially increase the yield strength.

The horizontal sectional view which shows the state by which the temporary volt | bolt and the back surface nut were fixed to the steel retaining wall. The horizontal sectional view showing one embodiment of a synthetic wall. The figure which shows arrangement | positioning of the bolt for permanent installation in the synthetic | combination wall which concerns on one Example of this invention shown in FIG. It shows to an example of the process in the synthetic | combination wall construction method based on this invention shown to FIG. Another embodiment according to the present invention. Another embodiment according to the present invention (when a steel pipe sheet pile is used). Another embodiment according to the present invention. FIG. 8 is a cross-sectional view taken along line AA of FIG. 7 in another embodiment according to the present invention. Another embodiment according to the present invention. Conventional example. Conventional example.

  The present invention relates to a composite wall composed of a steel retaining wall and a reinforced concrete wall, and uses bolts instead of a detent material attached by stud welding in order to fix the reinforced concrete wall to the steel retaining wall. Before and after placing the earth retaining wall into the ground, the short temporary bolt is replaced with a long permanent bolt. Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a horizontal sectional view showing a state in which a temporary bolt and a back nut are fixed to a steel retaining wall. FIG. 2 is a horizontal sectional view showing an embodiment of the composite wall structure according to the present invention. In these drawings, 1 is a steel retaining wall, 11a, 11b, 11c, 11d, and 11e are steel sheet piles constituting one section of the steel retaining wall 1, 2 is a reinforced concrete wall, 3 is a temporary bolt, 3a is The head of the temporary bolt 3, 4 is a back nut, 5 is a washer, 6 is a bolt for permanent installation, 7 is a surface nut, 8 is a fixing portion for fixing the back nut 4 to the steel sheet pile, 9 is a rebar of the reinforced concrete wall 2, 10 concrete, 12 steel sheet pile 11a, 11b, 11c, 11d, the joint portion connecting 11e each other, the inner surface 111 of the inner synthetic wall of steel sheet piles web 112 outside of the synthetic wall of steel sheet pile web The outer surface is shown.

  In the following description, the inside of the steel retaining wall 1 refers to the side facing the reinforced concrete wall 2, and the outside of the steel retaining wall 1 refers to the soil side that is the outside of the steel retaining wall 1. Point to. The inner side of the synthetic wall refers to the inner structure side of the synthetic wall, and the outer side of the synthetic wall refers to the soil side which is the outer side of the synthetic wall. , 11d, and 11e.

Steel earth retaining wall 1, are placed sequentially, steel sheet pile 11a having a flange and a web, 11b, 11c, 11d, are configured in 11e, these steel sheet pile has a web, with respect to reinforced concrete walls, uneven Inverted up and down so that As the steel sheet piles 11a, 11b, 11c, 11d, and 11e having flanges and webs, for example, U-shaped steel sheet piles or hat-shaped steel sheet piles can be used. Here, a U-shaped steel sheet pile will be described as an example.

Before placing the steel sheet piles 11a, 11b, 11c, 11d, and 11e into the ground, the steel sheet pile 11b (11d) that comes in contact with the reinforced concrete wall 2 inside the synthetic wall of the steel sheet pile web. A plurality of bolt holes (not shown in the figure) are processed in the web .

After the temporary bolt 3 is inserted into the bolt hole from the inner surface 111 side of the web , the back nut 4 is screwed on the outer surface 112 side. It is desirable to use the washer 5 so that the temporary bolt 3 does not loosen when the steel sheet pile 11b is driven into the ground.

After the temporary bolt 3 is fastened to the steel sheet pile 11b (11d) between the head 3a and the back surface nut 4, the back surface nut 4 is spot welded to the outer surface 112 of the web that is outside the steel retaining wall 1 or It is fixed at the fixing portion 8 by fillet welding around the entire circumference.

  The length of the temporary bolt 3 is not particularly limited as long as it is not deformed when the steel sheet pile 11b (11d) is driven into the ground and can be fixed by the back nut 4 through the steel retaining wall. For example, when using a bolt set with a shaft diameter of 22 mm, the height of the head of the temporary bolt 3 is as small as about 14 mm and the height of the back nut is as small as about 22 mm. Don't be.

  Moreover, when excavating the inside of the steel retaining wall 1, the height of the head of the temporary bolt 3 is low and the length of the protruding portion is short, so that excavation work can be performed quickly. Even if the temporary bolt 3 is accidentally damaged, the temporary bolt 3 is replaced with the permanent bolt 6 so that no trouble occurs.

  The back nut 4 may be fixed using a fixing member or using a means other than welding, such as an adhesive. It is assumed that the temporary bolt 3 and the back nut 4 are subjected to water stop treatment as necessary. As a water stop treatment method, a method of applying a water stop material, a method of installing a waterproof cap or the like on the back nut 4 and the like are used.

  In the present invention, the steel sheet pile 11e is sequentially placed in order from the steel sheet pile 11a in a state where the temporary bolt 3 and the back nut 4 are attached to the steel sheet piles 11b and 11d to form the steel earth retaining wall 1 in the ground. As the placing method, various methods such as construction using a vibro hammer and press-fitting construction using a hydraulic device can be applied.

  When the steel retaining wall 1 is driven without screwing the temporary bolt 3 to the back nut 4, the rigidity of the steel retaining wall 1 is reduced due to the perforated defect, so that deformation or buckling occurs during the placing. Not only is it likely to occur, but there is a risk that groundwater will permeate through the hole. For this reason, the temporary bolt 3 is screwed to the back nut 4 and, if necessary, the temporary bolt 3 and the back nut 4 are subjected to water stop treatment and then placed.

After placing the steel retaining wall 1 and excavating the inside, the temporary bolt 3 is removed and replaced with a main bolt 6 having a front surface nut 7, and screwed with a front surface nut 7 and a back surface nut 4. In this way, the permanent bolt 6 is fixed to the steel sheet pile 11b (11d). Thereafter, the reinforced concrete wall 2 is constructed by being driven in a substantially straight line so as to be in contact with and parallel to the webs of the steel sheet piles 11b and 11d that are convex on the inside of the steel earth retaining wall.

  FIG. 2 shows a state in which the steel retaining wall 1 and the reinforced concrete wall 2 constructed on the inner side of the steel retaining wall 1 are integrated via the bolts 6 for installation. Since the main installation bolt 6 functions as a slip stopper, the reinforced concrete wall 2 and the steel earth retaining wall 1 are integrated.

  For the main bolt 6 and the surface nut 7, for example, a commercially available bolt set may be used. Also, use a washer if necessary. The shaft diameter of the permanent bolt 6 is the same as that of the temporary bolt 3. The length of the permanent bolt 6 varies depending on the thickness of the reinforced concrete wall 2 and the shaft diameter of the permanent bolt 6. For example, when the thickness of the reinforced concrete wall 2 is 300 mm and the shaft diameter of the permanent bolt 6 is 22 mm. , About 150 mm to 200 mm.

In addition, the arrangement | positioning of the bolt hole processed into the web of the steel sheet piles 11b and 11d shall make the predetermined bolt 6 exhibit the predetermined performance as a slip stopper. In FIG. 3, the example of arrangement | positioning of the volt | bolt 6 for permanent installation with respect to the web surface of the steel sheet piles 11b and 11d is shown.

  According to the present invention, since the back nut 4 is fixed to the steel earth retaining wall 1 by welding or the like, it is possible to perform bolting from one side, and only work from the inside of the steel earth retaining wall 1 is possible. It is possible to remove the bolt 3 and fix the permanent bolt 6.

  The replacement from the temporary bolt 3 to the permanent bolt 6 can be performed quickly and easily with high accuracy by using, for example, an electric torque wrench. FIG. 4 shows an example of steps in the synthetic wall construction method according to the present invention.

FIG. 5 shows a cross-sectional structure of a composite wall according to another embodiment of the present invention. The bolt 6 for permanent installation is attached to each web of the steel sheet piles 11b, 11c, and 11d according to the procedure mentioned above. The permanent bolt 6 attached to the steel sheet pile 11c is preferably long enough to fit in the reinforced concrete wall 2 by 50 mm or more.

  The reinforced concrete wall 2 is constructed by continuously placing concrete along the inner shape of the steel sheet piles 11b, 11c, 11d constituting one section of the steel earth retaining wall 1.

  By placing concrete according to the shape of the steel retaining wall and using a relatively long permanent bolt, the integrity of the steel retaining wall and the reinforced concrete wall will be further increased and the proof stress will be increased. Is possible.

  FIG. 6 shows another embodiment of the present invention, and shows a case where a steel pipe sheet pile 14 is used instead of the steel sheet pile arranged continuously. The bolt 6 for permanent installation is fixed to the part which becomes the reinforced concrete wall 2 side among the pipe walls of the steel pipe sheet pile 14 using the back surface nut 4 and the surface nut 7. FIG. The procedure from the processing of the bolt holes to the fixing of the permanent bolts 6 follows the above-described procedure.

  As the depth of the composite wall increases, the action force due to earth pressure and water pressure increases. In addition, a large force may be locally generated at the joint between the slab and the foundation. It is difficult to change the cross-sectional shape of the conventional steel earth retaining wall in the depth direction.

  In the present invention, it is possible to partially increase the proof stress by installing a plate member in a portion where the acting force is large.

  FIG. 7 is a horizontal cross-sectional view illustrating a structure in which the plate member 13 is attached to the steel retaining wall of the composite wall shown in FIG.

The steel sheet pile 11c to hit設前, the plate member 13 obtained by processing the bolt hole, as the position of the bolt hole and the steel sheet pile 11c web processed bolt holes of match, an outer surface of the steel sheet pile 11c web It arrange | positions at 112 side and lets a temporary volt | bolt pass.

  Next, a back nut is screwed on the back side of the plate member 13, and the back nut is fixed to the plate member 13 by welding or the like. Then, after performing a water stop process to a temporary bolt and a back surface nut part as needed, the steel sheet pile 11c is driven, and after excavating the soil, the temporary bolt is replaced with the permanent bolt 6. Here, it is desirable to replace the temporary bolts with the permanent bolts one by one in consideration of the fact that the plate member 13 shares a part of the stress.

  When a plate member is added to the steel retaining wall, when the steel retaining wall is placed in the ground, the rigidity of the steel retaining wall is increased and deformation or buckling of the steel retaining wall is prevented. Is prevented.

  FIG. 8 is a cross-sectional view taken along the line AA in FIG. The plate member 13 can be installed only in the portion where the acting force is large to partially increase the proof stress. As a result, it is possible to efficiently resist an acting force such as a bending moment due to earth pressure or water pressure, and it is possible to achieve rationalization of the cross section, reduction of steel weight, and cost reduction.

  FIG. 9 shows a structure in which the plate member 13 is attached to a part of the inner wall of the steel pipe sheet pile 14. The mounting position of the plate member 13 is the inner wall surface of the steel pipe sheet pile 14.

  Although the above explanation was made about the case where a steel earth retaining wall is constructed with a U-shaped steel sheet pile and a steel pipe sheet pile, a steel earth retaining wall is formed using a hat-shaped steel sheet pile, a grooved steel sheet pile, and a flat steel sheet pile. Even when constructed, the present invention can be implemented.

DESCRIPTION OF SYMBOLS 1 Steel retaining wall 2 Reinforced concrete wall 3 Temporary bolt 3a Temporary bolt head 4 Back surface nut 5 Washer 6 Main bolt 7 Surface nut 8 Fixing part (welding part)
DESCRIPTION OF SYMBOLS 9 Reinforcement 10 Concrete 11a, 11b, 11c, 11d, 11e Steel sheet pile 12 Joint part 13 Plate member 14 Steel pipe sheet pile 111 Inner surface 112 Outer surface 100 Steel earth retaining wall 200 Reinforced concrete wall 300 Detension material 400 Shear reinforcement reinforcing bar 500 Core Material 600 Thread Bolt 700 Protection Cap 800 Joint Coupler 900 Thread Connector 1000 Soil Cement 1100 Concrete

Claims (3)

A synthetic wall composed of a steel earth retaining wall and a reinforced concrete wall, and a locking bolt with a surface nut having a shaft diameter of 22 to 36 mm, which is inserted through the steel earth retaining wall, includes the surface nut and the steel earth retaining wall. It is screwed between the back nut fixed to the wall, and the bolt hole for temporary bolt used when placing the steel earth retaining wall is inserted and fixed to the steel earth retaining wall. A composite wall structure, wherein the locking bolt with a surface nut functions as a locking between the steel earth retaining wall and the reinforced concrete wall. The said steel earth retaining wall is comprised with the steel sheet pile which has a flange part and a web part, The said bolt for surface locking with a surface nut is being fixed to the web part of the said steel sheet pile. Composite wall structure.   The synthetic wall structure according to claim 1, wherein the steel earth retaining wall is formed of a steel pipe sheet pile.

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