JP3664717B2 - Steel wall and manufacturing method thereof - Google Patents

Description

  The present invention relates to a steel wall suitable for locations where there is a large amount of water such as the sea surface or a water surface waste disposal site, mainly water bottom ground, and requires water shielding, and a method for manufacturing the same.

  Steel sheet piles are often used for earth retaining walls in the construction of underground structures and temporary cut-offs during the construction of harbors and water facilities. The reason for this is that a high-rigidity wall made of a high-quality material such as steel can be constructed within a relatively short construction period, and is relatively excellent in water shielding.

  Naturally, the steel material itself of the steel sheet pile main body does not allow water to pass through completely, but since the gap portion existing in the joint portion allows water to pass through in the fitted state, the gap of the joint portion greatly affects the water impermeability of the steel sheet pile.

  In general, even if the joint part immediately after placing is relatively easy to pass water, with the passage of time, soil particles and the like are clogged with the flow of water, However, if the clogging inside the joint due to soil particles cannot be expected, or in order to further improve the water shielding, it is considered to make the gap inside the joint as small as possible. It is done.

  However, if this gap is too small, there is a problem that the casting resistance at the joint part becomes very large, and the water impermeability and workability are incompatible requirements. It was not possible to make it smaller or larger, and one of the major issues was how to increase the water barrier of the joint.

  For example, when a steel sheet pile wall is used as a water shielding method in a conventional waste disposal site, a predetermined amount of a swellable water stop material is applied to the joint before placing the steel sheet pile, and the water stop material is For example, there is a method of shielding water by utilizing swelling of the liquid.

Further, in Patent Document 1, as a “water blocking wall”, as shown in FIG. 10 , a water blocking wall structure 63 in which joints 62 of a plurality of U-shaped steel sheet piles 61 are integrated by welding is formed. The wall structure 63 is continuously provided in the ground while fitting the joints 64 at the side edges thereof, and the ground improvement 65 is applied around the joints 64 of the water blocking wall structures 63 adjacent to each other. Is described.

In addition, Patent Document 2 discloses a female joint material 73 as one of joints of steel pipe sheet piles 71 as a pair of wing parts 74, as shown in FIG. One of the wings 75 is provided with a skirt 75a extending outward, and a large number of the steel pipe sheet piles 71 are connected to each other by fitting the male joint material 72 and the female joint material 73 together. After forming the sheet pile wall, the ground on one side which is the construction side of the building is excavated to expose the joint portion, and the tip of the hem 75a of the female joint material 73 is connected to the outer surface of the steel pipe main body of the counterpart steel pipe sheet pile 71. Describes a method of fixing watertightly by welding 76.
JP 2001-026925 A JP 07-324329 A Japanese Patent Laid-Open No. 01-168766 Japanese Unexamined Patent Publication No. 01-280122 JP 2000-192446 A JP 2000-192451 A JP 2000-077331 A JP 2000-234330 A JP 2001-214435 A JP 2001-248152 A JP 2002-146772 A

  In the construction of steel walls with steel sheet piles, etc., the method using a swellable water stop material is not only for the environmental safety and durability of the swellable water stop material itself, but also for the steel sheet pile from the time of application and installation. When the time to placing a sheet pile, etc. is long, the water-stopping material swells due to rain, condensation, moisture, etc., and it takes time to place the steel sheet pile, etc. There is a risk of carbonization due to heat, and it becomes necessary to confirm the water blocking properties of the formed impermeable walls.

  In that case, for example, it will be necessary to inspect whether water has flowed out from the waste disposal site to the outside of the impermeable wall, or in areas where the water stoppage is insufficient, In addition to the need for ground improvement, construction costs and construction periods increase, and there is a problem that the feeling of anxiety about leakage cannot be wiped out.

  Moreover, in the case of U-shaped steel sheet piles, etc., the water-stopping material is located on the neutral axis of the cross section of the continuous steel sheet pile wall, so that during the construction, the water-stopping material is repeatedly displaced by shear shear force due to wave external force, There is a risk of damage.

  Moreover, in invention of patent document 1, in addition to selection of the heavy machine and jig | tool corresponding to the weight of the integrated water stop wall structure 63, the water stop by the ground improvement 65 near the coupling 64 of the water stop wall structure 63 is carried out. It is necessary to secure the environment and safety of the material used for the ground improvement 65.

  On the other hand, in the invention described in Patent Document 2, welding is used for the joint portion. However, since it is a water stop for a building, that is, a ground water stop for the ground, unlike a water stop for a waste disposal site or the like, The degree of water-stopping is usually enough to match the drainage facilities provided on the building side, and is different from the one that required higher water-blocking and fail-safe functions as intended by the present invention.

  Further, in the invention described in Patent Document 2, since the female joint material 73 having a special shape is used, the female joint material 73 may be deformed at the time of placing, and is in a wet state or an underwater state due to ground water or the like in the excavation ground. The certainty of the vertical welding of the exposed joint is questionable. Further, these methods cannot use an automatic welder.

  The present invention is intended to solve the problems in the prior art as described above, and forms a space capable of automatic welding of the joint portion, and obtains high water shielding efficiency efficiently and at low cost without impairing workability. It is an object of the present invention to provide a steel wall and a method for manufacturing the same.

The steel wall according to claim 1 of the present application is a steel wall having a double wall structure in which a plurality of steel materials having joints at both ends are connected by the joint and has a closed region on the inside, and all of the joints are The water-stopping profiles covering the joint are continuously welded in the longitudinal direction with no gaps.

  In order to obtain high water-imperviousness at the joint portion of the steel wall, the present invention covers the joint portion of the steel material such as the steel sheet pile with the water-stop shape, and then the steel material and the water-stop shape or the water-stop shape. The sections are welded to each other continuously or without gaps in the longitudinal direction.

  Such joining can be performed by an automatic welding machine or the like by removing earth and sand near the welding position and securing a space where welding is possible.

Claim 2 limited the case where the steel wall according to claim 1 is engaged or welded to the joint vicinity closed region side of the steel material so as to cover the joint. Is.

  The water-stop shape covering the joint may be previously attached to one steel material by welding or the like, or a steel material is provided with a locking portion extending in the longitudinal direction of the steel material, A lip-shaped groove steel or a lip-shaped angle steel may be used, and the lip portion at the end of the water-stopping shape material may be engaged with the locking portion of the steel material.

  A water stop shape attached to a steel material and the other steel material welded, a water stop shape attached to both steel materials, a water stop shape attached to a steel material, The welded portion of the other steel material is welded, the lip portion or flange portion of the water-stopping profile and the welded portion of both steel materials or both steel materials, etc. The object of the present invention can be sufficiently achieved with any steel wall.

  As such a water-stop shape, in addition to the above-mentioned grooved steel with a lip and angle steel with a lip, a cross-sectional shape can be used as long as it can cover a joint part and can be easily attached to a steel wall. Etc., not particularly limited.

  Further, the material for the water stop shape may be other than steel as long as it has appropriate strength and weldability.

  A third aspect of the present invention is the steel wall according to the first or second aspect, wherein the connected steel material is inserted into water and / or the ground.

  A method for producing a steel wall according to claim 4 of the present application is to form a steel wall having a double wall structure having a closed region inside by placing a steel material having joints at both ends while fitting the joints. In the state where the closed region side of the joint is covered with a water-stop shape, earth and sand and / or moisture existing in the closed region are removed, and the water-stop shape and the steel material or the stop material covering the joint are removed. It is characterized by automatically welding the water shape members in the longitudinal direction.

  As a steel material having a joint that forms a steel wall having a double wall structure, there is a so-called box-type steel sheet pile, and a closed region is formed between the inner and outer joints by fitting.

  Also, for box-type steel sheet piles, straight steel sheet pile types, H-shaped steel sheet piles, Z-shaped steel sheet piles, U-shaped steel sheet piles, or cross-sectional shapes are arranged in the same direction. Asymmetric U-shaped steel sheet piles that can be joined together in a straight line, or a combination of steel and H-shaped steel, T-shaped steel, etc. that form a partition wall and a box shape There is no particular limitation as long as it can form a double-walled steel wall having a closed region on the inside and can be fitted with a water-stopping profile in the vicinity of the joint.

In addition, in the method for manufacturing a steel wall according to claim 4, for preventing water from entering a closed region formed on the inner side of the double wall structure or on one side of the steel wall, a water-stopping shape is used as necessary. The water staying in the region surrounded by the material and the steel material is discharged, or the filler is thrown into the region surrounded by the water-stop shape and the steel material.

  As a filler, in addition to a material that absorbs and solidifies moisture such as a grout material, a mortar material, and a polymer water-absorbing material, asphalt, clay, dredged sand, and the like can be used.

Further, regarding the removal of earth and sand and moisture present in the closed region in the method for producing a steel wall according to claim 4 , if it is underwater, it is only necessary to drain it with a pump or the like, but in marshes etc. If necessary, the gap between the water-stop shape covering the joint and the steel is also cleaned.

  As a specific method for removing earth and sand, there is a method in which the ground up to the impermeable layer is excavated with a water jet or an excavator, and drained together with the earth and sand with a sand pump or the like.

  Welding of steel materials such as steel sheet piles and water-stopping profiles covering the joints, or welding of water-stopping profiles, includes the usual automatic welding by attaching a guide for automatic welding to the steel materials with a magnet, for example. It can be done by a method.

In the present invention, the welding speed at which the required thickness and welding length can be ensured can be, for example, around 10 to 20 cm / min for MAG welding using CO ₂ gas as a shielding gas, and about twice this for plasma welding. It is possible to perform welding with almost the same quality for a long time with a simple setting. Therefore, compared with the welding work of a welder, uniform and efficient welding can be performed, and the longer the total weld length, such as a waste disposal site using a steel sheet pile, the greater the effect of reducing welding costs.

  In general, welding by a welder requires a scaffold and a break. Further, regarding welding in the present invention, vertical welding (lateral welding), which is difficult to work compared to downward welding, is called automatic welding. As a result, it is not necessary to secure a large work area as if the welder is working, and since the earth and sand and moisture in the closed area are removed for welding, special equipment and skills for underwater welding are not required. , Can maintain the uniformity of welding quality.

According to a fifth aspect of the present invention, in the method for producing a steel wall according to the fourth aspect , the case where the earth and sand and / or moisture present in the closed region are removed up to the upper part of the water shielding layer is limited.

  For example, when there is a water-impervious layer in the seabed ground of the sea surface waste disposal site, even if the underwater part can be water-blocked, the layer above the water-impervious layer such as a clay layer on the seabed ground will be water-stopped. It may be insufficient.

  In that case, remove the earth and sand, etc. above the water-blocking layer, and also remove part of the water-blocking layer if possible, and insert the water-stopping material covering the joint to the water-blocking layer, and then Filling the region surrounded by the shape and steel, or filling the region surrounded by the water-stop shape and the steel with a pump or the like to discharge the water from the region After preventing intrusion of water into the closed area, the earth and sand and / or moisture present in the closed area are removed, and finally the joint between the steel and water-stop shape in the air or between the water-stop shapes By automatically welding, it is possible to ensure waterproofness even at the seabed.

The invention of the present application uses a closed wall of a steel wall having a double wall structure formed by connecting steel members having joints at both ends, and uses a water-stop shape and steel material and / or water-stop for covering the joint. Welded the sections continuously without gaps in the longitudinal direction by automatic welding, etc., and were able to manufacture steel walls efficiently and inexpensively without interfering with the connection between the joints of steel materials. High reliability can be secured as a water barrier for steel walls.

  The invention of the present application enables complete water shielding of the steel wall by performing continuous welding without gaps in the longitudinal direction on the part that requires water stoppage in the joint part of steel materials such as steel sheet piles. In particular, when a steel material having a flat portion in the vicinity of the joint portion is used, the advantage of the shape is also great.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows, as a flowchart, an example of a construction procedure when a box-type steel sheet pile 1 as shown in FIG. 2 is used as a steel material having a flat portion in the vicinity of the joint and is applied to a seawater area. Work is performed (the same is true for rivers, lakes, etc.).

(1) Depending on the construction capacity of steel sheet pile driving equipment and the number of units used, steel wall A (steel sheet pile double wall) with a double wall structure made of box-type steel sheet piles 1 from any part of steel wall A Is started (FIG. 1a).
Depending on the soil layer structure of the submarine ground, that is, the position, thickness, and properties of the sand layer and clay layer, earth and sand with poor water shielding may be deposited in the double wall above the water shielding layer. The bottom sediment in the heavy wall is excavated, and the sediment and water in that portion are discharged (FIG. 1a ′). At this time, it is not necessary to completely eliminate the water in the double wall closed region B.

(2) Next, the lip portion 7a of the grooved steel with a lip as the water-stopping shape member 7 is connected to the joint 2a of the steel sheet pile 1 so as to cover the joint portion 2 of the box-type steel sheet pile 1 placed in (1). , 2b while being engaged with the locking portion 6 provided in the flat portion 3 in the vicinity of 2b. If necessary, it will be placed in the soil on the seabed (Figure 1a).

(3) After that, in order to prevent water staying in the joint water stop region C surrounded by the water stop shape material 7 and the steel sheet pile 1 from entering the closed region B in the double wall, The water staying in the water region C is always discharged by a pump or the like (FIG. 1c).
Alternatively, for the purpose of preventing water from entering through the joint portion 2 from the outside to the inside of the double wall, the joint water stop region C surrounded by the engaged water stop shape member 7 and the box-type steel sheet pile 1 is used. Filling material such as mortar (Fig. 1c ')
And it confirms that there is no invasion of the water from the joint water stop area | region C to the closed area | region B in a double wall by throwing in a filler. Specifically, the change in the water level in the double wall closed region B may be confirmed.

(4) After that, for each closed region B in the double wall partitioned by the box-type steel sheet pile 1, the seawater (and earth and sand depending on the situation) is drained with a pump or the like (FIG. 1 d)). When the step (3) is adopted, the step (4) may be performed in parallel.

(5) Confirm that there is no entry of water from the outside into each closed region B in the double wall, and the gap between the grooved steel with lip as the water-stop shape 7 and the box-type steel sheet pile 1 Are welded by an automatic welder (FIG. 1e). In FIG. 2 (b), reference numeral 8 indicates the welded portion.

  FIG. 2 shows a case where a box-type steel sheet pile 1 is used as a steel material constituting the steel wall A according to the present invention. The box-type steel sheet pile 1 shown in FIG. 2 is a steel material having a substantially H-shaped cross-section in which two parallel flange portions 1a are connected by a web portion 1b. Each flange portion 1a has joints 2a, It has the form of the linear steel sheet pile 1a which has 2b.

  The adjacent box-type steel sheet piles 1 are made of steel having a double wall structure having a closed space B inside by sequentially connecting the joints 2a and 2b at both ends of the two parallel flange portions 1a while fitting. Wall A is formed.

  In construction in a water area, the closed space B is usually filled with water, and the lower part thereof is in a state of being rooted in the earth and sand of the water bottom ground.

  After that, as shown in the figure, the lip portions 7a at both ends of the lip-shaped grooved steel as the water-stopping shape member 7 are engaged with the engaging portions 6 provided on the flat portion 3 of the flange portion 1a of the steel sheet pile 1, The joints 2a and 2b are engaged with each other.

  Thereafter, the water inside the closed space B is drained with a pump or the like, and the gap between the water-stopping steel material 7 and the steel sheet pile 1 is welded using the closed space B by an automatic welding machine. Realize water shielding.

  If water leaks from the bottom of the water, the soil and sand are removed from the bottom of the water to a predetermined depth by a water jet or excavator, and the water-stopping steel 7 and steel sheet pile 1 that have penetrated into the soil are automatically After welding, backfill the earth and sand at the root.

  FIG. 3 shows an embodiment in which a box-type steel sheet pile in which asymmetric U-type steel sheet piles are doubled is used as a steel material constituting the steel wall according to the present invention.

  The box-type steel sheet pile 11 shown in FIG. 3 has a shape of the joints 2a and 2b at both ends that is asymmetrical, can be coupled linearly with the same cross-sectional shape in the same direction, and is placed in the vicinity of the joint portion 2 at both ends. An asymmetric U-shaped steel sheet pile having a flat portion 3 that is in the same direction as the line and having joints 2a and 2b at both ends formed so that one of the hook-shaped joints 2a and 2b that engage with each other faces inward and the other faces outward Are arranged back to back and integrated by welding.

  By sequentially connecting adjacent box-type steel sheet piles 11 while fitting the joints 2a and 2b at both ends, a steel wall A having a double wall structure having a closed space B inside is formed.

  The discharge of soil and / or water in the closed space B and the automatic welding method are the same as in the embodiment of FIG.

  FIG. 4 shows another embodiment in the case of using a box-type steel sheet pile 12 in which asymmetric U-type steel sheet piles are arranged as a steel material constituting the steel wall A according to the present invention.

  The box-type steel sheet pile 11 in FIG. 3 has two asymmetric U-type steel sheet piles arranged back to back and integrated by welding, whereas the box-type steel sheet pile 12 in FIG. The cross section rigidity is improved by welding and integrating the H-shaped steel as the connecting steel material 4 between the sheet piles.

  That is, by increasing the length of the steel material connecting the asymmetrical U-shaped steel sheet piles, the cross-sectional rigidity can be increased, and by using the H-shaped steel as the connecting steel material 4, the torsional rigidity is increased and the occurrence of welding strain can be reduced. Manufacturing becomes easy.

  FIG. 5 shows another embodiment in the case of using a box-type steel sheet pile 13 in which straight steel sheet piles are doubled as a steel material constituting the steel wall A according to the present invention. A double-claw type straight steel sheet pile and a thick plate-like connecting steel material 4 connecting them are integrated by welding.

  FIG. 6 shows a box-shaped steel sheet pile 14 having a tubular female joint having slits at both ends of a flange portion of a steel material having an H-shaped cross section and a male joint fitted therein as a steel material constituting the steel wall A according to the present invention. An embodiment in the case of using is shown.

  Similarly, FIG. 7 shows a steel sheet pile 15 in which the connecting steel material 4 is integrated by welding between two U-shaped steel sheet piles arranged back to back as a steel material constituting the steel wall A according to the present invention, and a normal U-shaped steel. The embodiment in the case where the joints of the sheet piles 16 are combined is shown.

  2 to 7 described above, a plurality of box-type steel sheet piles can be previously welded on land to form a unit, which can be driven and connected.

FIG. 8 shows an example of the shape of the water-stopping shape member 7 covering the joint portion of the steel material constituting the steel wall A in the present invention . FIG. 8 (a) shows a general shape steel with a lip. 8 (c) shows a lip-shaped channel steel having an outward lip portion 7b, and FIG. 8 (b) shows a specially-shaped lip-shaped shape in which the web portion of the lip-shaped channel steel is chevron. This is the case of wood.

  In addition, although not shown, a circular or semicircular shape can be used.

FIG. 8 (d) shows an example in which angle steels 7a and 7b are welded beforehand in the vicinity of the joints 2a and 2b of the steel materials to be connected to each other as the water stop shape, and the angle steels 7a and 7a, This is a case where the tip ends of 7b overlap and the joint water-stopping region C is formed inside.

  In this case, in the closed region B, complete water shielding is possible by continuously welding the portions where the end portions of the angle steels 7a and 7b as the water-stopping shape are overlapped without any gap in the longitudinal direction. In addition, the water stop sealing material may be interposed separately in the overlapping part of the angle steels 7a and 7b as needed. As the water-stop sealing material, for example, water-stop rubber or water-swellable resin paint can be used.

FIG. 9 shows another example of the asymmetric U-shaped steel sheet pile 21 as a steel material used in the present invention . Both the left and right joints 2a and 2b have double claws composed of an inner claw 31 and an outer claw 32. There is a feature in that.

  Note that the height of the protrusion (corresponding to the inner claw 31 and the outer claw 32) in the figure is the height shown in the figure unless rotation can be restricted and the joints 2a and 2b are not easily separated from each other. Regardless of, it may be lower.

  Further, the position of the flat portion 4 with respect to the joints 2a and 2b is not the lowermost end of the inward joint 2b and the uppermost end of the outward joint 2a as shown in the figure. It is sufficient if there is no position.

It is a flowchart which shows the outline | summary of the manufacturing method of the steel wall which concerns on Claims 4 and 6 of this application. One Embodiment of the steel wall which concerns on Claims 1-3 of this application is shown, (a) is a top view, (b) is an expanded sectional view which shows the detail of the principal part. It is a top view which shows other embodiment of the steel wall which concerns on Claims 1-3 of this application. It is a top view which shows other embodiment of the steel wall which concerns on Claims 1-3 of this application. It is a top view which shows other embodiment of the steel wall which concerns on Claims 1-3 of this application. It is a top view which shows other embodiment of the steel wall which concerns on Claims 1-3 of this application. It is a top view which shows other embodiment of the steel wall which concerns on Claims 1-3 of this application. (a)-(b) is a horizontal sectional view which shows the example of the shape material for water stop used by this invention, and each automatic welding position, respectively. (a) is a top view which shows the other example of the steel sheet pile as steel materials used by this invention, (b) is an enlarged view of the joint part. It is a horizontal sectional view which shows the example of the water stop wall using the conventional U-shaped steel sheet pile. It is a top view which shows the example of the water stop wall using the conventional steel pipe sheet pile.

Explanation of symbols

A ... Steel wall, B ... Closed region, C ... Fitting water stop region,
DESCRIPTION OF SYMBOLS 1 ... Steel sheet pile, 1a ... Flange part, 1b ... Web part, 2 ... Joint part, 2a, 2b ... Joint, 3 ... Flat part, 4 ... Connection steel material, 6 ... Locking part, 7 ... Shape for water stop ( Grooved steel with lip), 7a ... lip portion, 7b ... outward lip portion, 7c, 7d ... profile for water stop (mountain steel), 8 ... welded part, 11, 12, 13, 14 ... steel sheet pile, 15 ... U-shaped steel sheet pile, 21 ... Asymmetric U-shaped steel sheet pile, 31 ... Inner claw, 32 ... Outer claw

Claims (5)

A steel wall having a double wall structure in which a plurality of steel materials having joints at both ends are connected by the joint and has a closed region on the inside, and for all of the joints , a water-stop shape covering the joint , the steel materials, and A steel wall characterized in that the water-stop shapes are continuously welded in the longitudinal direction with no gaps. The steel wall according to claim 1, wherein the water-stop shape is engaged or welded to the joint vicinity closed region side of the steel so as to cover the joint.   The steel wall according to claim 1 or 2, wherein the connected steel materials are penetrated into water and / or the ground.   A steel material having joints at both ends is placed while fitting the joints to form a double-walled steel wall having a closed region inside, and the closed region side of the joint is formed with a water-stop shape. In the covered state, the earth and sand and / or moisture existing in the closed region are removed, and the water-stop shape covering the joint and the steel material or the water-stop shape are automatically welded in the longitudinal direction. A method for manufacturing a steel wall. 4. Symbol placement of the manufacturing method of the steel wall and removing the soil and / or moisture present in the closed region to the top of the water barrier layer.

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