JP5828520B2 - Steel sheet pile joint water stop construction and spill prevention hardware - Google Patents

Description

  The present invention relates to a steel sheet pile joint water stop construction method and an outflow prevention hardware, and in particular, a steel sheet pile that suppresses the flow of ambient water from the joint portion of each adjacent steel sheet pile constituting the cutoff wall into the cutoff working space. The present invention relates to a joint water stop construction method and an outflow prevention hardware used in the construction method.

  For example, when revetment work for a river or construction work for building a bridge pier, etc. in a river, after a part of the river is closed by a cut-off wall as a construction work area, It is common to perform temporary construction by making a construction work section formed in a river into a deadline work space where workers can enter by pumping up the wastewater. In the temporary construction with the construction work section formed in the river as the cut-off work space, preferably using U-shaped or hat-shaped steel sheet piles, these end sections are engaged with each other to form a joint portion. For example, using a vibro hammer, a large number of steel sheet piles are sequentially placed from the water surface to the bottom surface, and these steel sheet piles are continuously arranged so as to surround the construction work section. A continuous cut-off wall is formed so as to have a planar shape of a square or a square (see, for example, Patent Document 1 and Patent Document 2).

  In addition, when pumping up the water inside the construction section that is closed by the cutoff wall, the water around the cutoff wall flows into the inside of the cutoff wall through the gap in the joint of the steel sheet pile due to the water head difference. In order to prevent this, for example, when the water depth in the construction section is deep, a double-cut wall is formed, and filling sand is inserted and filled between them to stop the cut-off wall. A construction method that improves aqueous properties is adopted. On the other hand, by applying a sealing material or the like to the joint portion of the steel sheet pile without using a double cut-off wall, the amount of water leaking into the interior through the gap in the joint portion is suppressed to be reduced. There is a case where a deadline working space in which an operator can enter is held inside the deadline wall by improving wateriness and removing water leakage by pumping up.

JP-A-11-36318 JP 2000-328533 A

  However, according to the conventional technology for improving the water-stopping property of the cutoff wall, the construction method in which the cutoff wall is formed in a double manner requires a large amount of temporary work, and the joint material does not have a double cutoff wall. It is necessary to use a sealing material or the like that is expensive and laborious. For this reason, it is desired to develop a new technique that can easily work using an inexpensive material and can easily improve the water-stopping property of the cutoff wall.

  The present invention is a steel sheet pile joint water-stop method that can easily work with an inexpensive material and can easily improve the water-tightness of the cut-off wall, and an outflow prevention hardware used in the method. The purpose is to provide.

The present invention pumps up the water inside the cut-off wall formed by closing the periphery of the construction section by arranging and arranging a large number of steel sheet piles that are driven from the water surface toward the water bottom surface. wherein when the construction and installation compartment deadlines working space, a joint portion waterproofing method of suppressing sheet piles from the surrounding water from the joint portion of the adjacent sheet pile flows into the deadline work space, the a joint portion so as to surround the outside of the deadline wall, the outflow preventing hardware in water at portions close to the joint portion is placed, the outside of the deadline wall portions adjacent to the joint portion, the outflow preventing hardware The clogging material is introduced into the water surrounded by the water, and the flow of water flowing into the closing work space through the gap of the joint portion due to the water head difference between the closing work space and the water surface outside the cutting wall. Put the clogged and put A steel sheet pile joint water-stop method that suppresses the amount of water leaked into the shut-off work space by causing the gap to be clogged by the clogging material. Thus, the above object is achieved.

  Further, in the steel sheet pile joint waterstop method of the present invention, the clogging material is composed of granular materials, flakes, or filaments having a specific gravity smaller than water, and a weight auxiliary material having a specific gravity larger than water. It is preferable that the mixed state is dispersed and floats in water after being poured into water in a mixed state and settling.

  Furthermore, in the steel sheet pile joint water stop construction method of the present invention, it is preferable that the clogging material is made of sawdust and is poured into water in a state of being mixed with sand or earth as a weight auxiliary material.

  Further, the present invention is an outflow prevention hardware used in the steel sheet pile joint portion waterstop method, which is arranged in the vertical direction along the outer peripheral surface of the steel sheet pile constituting the cutoff wall, from the water bottom A pair of outer additional legs having a length equal to or higher than the height of the steel sheet pile, and a portion opposite to the additional edge of the pair of outer additional legs is provided, In a state where a gap larger than the thickness of the steel sheet pile is maintained between the partition surface plate portion arranged at a distance from the joint portion and the additional edge portion of the pair of outer additional leg portions, A pair of inner additional legs disposed parallel to the outer additional legs, and the pair of inner additional legs and the pair of outer additional legs are connected and integrated at their upper ends. By providing an outflow prevention hardware comprising a connecting joint and a lifting latch provided at the upper end portion, the above object One in which was achieved.

  According to the steel sheet pile joint water stop construction method of the present invention or the outflow prevention hardware used in the construction method, it is possible to easily work using an inexpensive material and to easily improve the water stoppage of the cutoff wall. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view illustrating a cut-off wall to which a steel sheet pile joint waterstop method according to a preferred embodiment of the present invention is applied. It is the A section enlarged plan view of Drawing 1 showing the state where the outflow prevention hardware was installed so that the joint part of a steel sheet pile might be enclosed from the outside. It is a side view of the outflow prevention metal fitting used for the joint part water stop construction method of the steel sheet pile concerning one preferred embodiment of the present invention. It is a perspective view explaining the situation which installs an outflow prevention hardware in the water of the portion which adjoins the joint part of a steel sheet pile. It is a perspective view explaining the situation which installs an outflow prevention hardware in the water of the portion which adjoins the joint part of a steel sheet pile.

  The steel sheet pile joint water stop method according to a preferred embodiment of the present invention is, for example, as shown in FIG. 1, in which a part of the river 20 is cut off by the steel sheet pile 11 as a construction work section 21 for revetment work, for example. After being closed off by the wall 10, workers can enter the construction work section 21 formed in the river 20 by pumping up and removing the internal water while performing support work (not shown). This was adopted when performing temporary work as the deadline work space 22. Moreover, the joint part water stop construction method of this embodiment suppresses that surrounding water flows into the cutoff working space 22 from the clearance gap between the joint parts 12 (refer FIG. 2) of the steel sheet pile 11 simply and cheaply. Thus, by improving the water stoppage of the cutoff wall 10, it is possible to pump up the leaked water that has flowed into the cutoff wall 10 using a small number of pumps, and to easily hold the cutoff working space 22. This was adopted as a still water construction method.

  That is, according to the conventional method for water-stopping the joint portion of the steel sheet pile constituting the cutoff wall, the joint portion water-stop method of the present embodiment is a polyfilm as a simple treatment performed from the side of the cutoff working space, for example. , Camber, water-expandable rubber, waste cloth, etc. are applied to the joint part, the amount of water leakage can be reduced only slightly, a pump for pumping up the leaked water, and a processing facility for processing the pumped water leak This was made in view of the technical problem that it was necessary to increase the capacity of the system and that the work process in the deadline work space was affected. In addition, in order to reliably reduce the amount of water leakage, special work such as diving work and waterproof work is required, so that it was made in view of the technical problem that the construction cost increased. Furthermore, in this embodiment, the flow velocity of the river 20 is as fast as about 2 m / sec, for example, and diving work is difficult, so from the river 20 side outside the cutoff wall 10 to the joint portion 12. In view of the technical problem that it is difficult to work directly.

  And the joint part water stop construction method of the steel sheet pile of this embodiment is formed by closing the circumference | surroundings of the construction construction area 21 by arranging and arranging many steel sheet piles 11 cast | placed from the water surface toward a water bottom face. When pumping up the water inside the deadline wall 10 to make the construction work section 21 a deadline work space 22 where workers can enter, the joint portions 12 of the adjacent steel sheet piles 11 (see FIG. 2) Is a water stop method that suppresses the surrounding water from flowing into the cutoff work space 22, and a clogging material is introduced into the water outside the cutoff wall 10 in the vicinity of the joint portion 12, and the cutoff work space 22. The clogging material is put into the gap of the joint portion 12 by being put on the flow of water flowing into the cutoff work space 22 through the gap of the joint portion 12 due to the water head difference between the water surface and the water surface outside the cutoff wall 10. , The crevice By Tsumeri, so as to suppress the amount of water leakage flowing into the shut-off working space 22.

  Moreover, in this embodiment, as shown in FIG. 2, the joint part 12 of each adjacent steel sheet pile 11 is enclosed from the outer side of the shut-off wall 10, and the outflow prevention metal 13 is in the water of the part adjacent to the joint part 12. The clogging material is thrown into the water surrounded by the outflow prevention hardware 13.

  Further, in the present embodiment, as shown in FIG. 3, the outflow prevention hardware 13 installed in the water in the portion adjacent to the joint portion 12 is vertically extended along the outer peripheral surface of the steel sheet pile 11 constituting the cutoff wall 10. A pair of outer additional legs 14 having a length L equal to or higher than the height from the bottom surface to the upper end of the steel sheet pile 11, and the additional edges of the pair of outer additional legs 14. 14a is provided by connecting a portion on the opposite side to the joint portion 12 of the steel sheet pile 11, and a partitioning face plate portion 15 disposed at an interval, and an additional edge portion 14a of the pair of outer additional leg portions 14. A pair of inner auxiliary legs 16 arranged in parallel with the outer auxiliary legs 14, respectively, in a state in which a gap s larger than the thickness of the steel sheet pile 11 is maintained therebetween, and the pair of inner auxiliary legs A connection for connecting and integrating the pedestal 16 and the pair of outer additional limbs 14 at their upper ends. The engagement portion 17, the upper end engaging lifting provided partial locking portion 18 (see FIGS. 4 and 5) and a.

  In the present embodiment, as shown in FIG. 1, the cutoff wall 10 is provided with a construction work section 21 for carrying out revetment work on one side of the river 20 having a river width of about 15 m, for example, on one side of the river 20. And is formed by forming a part of the river 20 by closing it. That is, for example, a large number of U-shaped steel sheet piles 11 are provided on the side edge portions of the heavy machinery for lifting such as a mobile crane installed on the ground surface of the work yard 23 on the side of the river 20. While the joint portions 12 are formed between the adjacent steel sheet piles 11 by meshing the section portions with each other, the steel plates are sequentially driven from the water surface toward the bottom surface using, for example, a vibro hammer, and these steels are used. By arranging and arranging the sheet piles 11 so as to surround the construction work section 21, the cutoff wall 10 is provided so as to close the construction work section 21 together with, for example, one bank of the river 20.

  Further, in this embodiment, when part of the river 20 is closed by the cutoff wall 10 to form the construction section 21, the water inside the construction section 21 partitioned from the river 20 by the cutoff wall 10 is pumped up. Thus, the construction work section 21 is set as a deadline work space 22 where workers can enter. That is, the deadline that the deadline wall 10 tries to fall to the right side of the construction zone 21 due to a water head difference with the water surface outside the deadline wall 10 that is generated by pumping up the water inside the construction zone 21. This is prevented by a well-known retaining support or the like (not shown) constructed on the inner side of the wall 10, and from the gap of the joint portion 12 of the steel sheet pile 11 due to the water head difference with the water surface outside the cutoff wall 10 By pumping up a larger amount of water than the water flowing into the construction space, it is possible to easily form the deadline work space 22 in the construction work section 21 closed by the deadline wall 10.

  Furthermore, in this embodiment, once the deadline work space 22 is formed in the construction work section 21, it continues to flow into the deadline work space 22 from the gap of the joint portion 12 of the steel sheet pile 11 due to a water head difference with the water surface outside the deadline wall 10. In order to suppress the flow rate of the leaked water, for example, as a simple measure to be performed from the side of the cut-off work space 22, water leakage that flows into the cut-off work space 22 while applying polyfilm, camber, water expansion rubber, waste cloth or the like to the joint portion 12. In order to more reliably and effectively suppress the flow rate, a clogging material is introduced into the water outside the cut-off wall 10 in the vicinity of the joint portion 12 so that the gap between the joint portion 12 of the steel sheet pile 11 is reduced. It is clogged with a clogging material.

  And in this embodiment, since the flow velocity of the river 20 in which the construction section 21 is formed is as fast as, for example, about 2 m / sec, the injected clogging material is in the vicinity of the joint portion 12. In order to prevent outflow from the water outside the cutoff wall 10, the outflow prevention hardware 13 is filled with the clogging material so as to surround the joint portion 12 of the steel sheet pile 11 from the outside of the cutoff wall 10. Prior to this, they are sequentially installed in the water in the vicinity of each joint 12 (see FIGS. 4 and 5).

  Here, in the present embodiment, the outflow prevention hardware 13 shown in FIGS. 2 to 5 is provided by connecting the pair of outer additional legs 14 and the pair of outer additional legs 14 as described above. The partition surface plate portion 15, the pair of inner additional leg portions 16 arranged in parallel with the pair of outer additional leg portions 14, and the inner additional leg portion 16 and the outer additional leg portion 14 are connected and integrated. It consists of a pair of connecting joints 17 and a lifting lock 18.

  In the present embodiment, the pair of outer supplementary leg portions 14 and the partition surface plate portion 15 are welded, for example, to a pair of channel steels 24 having a flat, substantially U-shaped cross section and one side flange portion 24a. The other side flange portions 24a on both sides are made into a pair of outer supplementary leg portions 14 by being joined and integrated in a state of being in close contact with each other, and a pair of channel steels continuously disposed on the same surface. The 24 intermediate plate portions 24b can be easily formed as the partition surface plate portions 15. The pair of channel steels 24 has a length L that is equal to or higher than the height from the bottom of the water to the upper end of the steel sheet pile 11, whereby the pair of outer supplementary leg portions 14 and the partition surface plate portion 15 are also The length L is equal to or higher than the height from the bottom of the water to the upper end of the steel sheet pile 11.

  In the present embodiment, as the upper end portion of the outflow prevention hardware 13, a wire engagement hole is formed as the lifting engagement portion 18 in the upper end portion of the intermediate plate portion 24 b of the pair of channel steels 24 ( (See FIGS. 4 and 5). For example, by engaging the lower end portion of the wire 30 suspended from the lifting heavy machine, for example, via the engagement hardware 31, the outflow prevention hardware 13 is connected to the lifting engagement portion 18 by the joint portion of the steel sheet pile 11. It is possible to easily perform the work of installing on and removing from the cutoff wall 10 so as to surround 12 from the outside (see FIGS. 4 and 5).

  Furthermore, in the present embodiment, a connecting joint 17 made of, for example, angle steel is provided at one end of each of the pair of outer auxiliary leg portions 14 by the other side flange portion 24a of each channel steel 24. Are integrally joined by welding or the like, and are attached so as to protrude to the side opposite to the partition surface plate portion 15 (see FIG. 3). At the overhanging portions of these connecting joints 17, for example, an inner supplementary leg 16 made of angle steel is joined to the supplemental edge 14 a of the outer supplementary leg 14 by integrally joining the upper end by welding or the like. In the state where the gap s slightly larger than the wall thickness of the steel sheet pile 11 is maintained, the outer attachment leg portions 14 are respectively arranged and attached in parallel. The pair of inner supplementary leg portions 16 have a shorter length than the outer supplementary leg portion 14, and one side portion of the angle steel is paired with a pair of channel steels 24 constituting the partition surface plate portion 15. And the other side part is attached in a state of being arranged perpendicularly to these intermediate plate parts 24b (see FIG. 2).

  As shown in FIGS. 4 and 5, the outflow prevention hardware 13 having the above-described configuration is lifted by using, for example, a lifting heavy machine, and the outer additional leg portion 14 and the partition surface plate portion 15 made of a pair of channel steels 24. Are disposed on the outer side (river 20 side) across the cutoff wall 10, and the pair of inner attached legs 16 made of angle steel are provided on the inner side (on the cutoff work space 22 side). By moving the space between the outer additional leg 14 and the pair of inner additional legs 16 downward so as to drop into the back plate 11a of the steel sheet pile 11, the outer additional leg 14 is moved. The attachment edge portion 14a is attached to the outer surface of the back plate 11a, and the inner attachment leg portion 16 is attached to the inner surface of the back plate 11a, and is installed on the cutoff wall 10.

  Moreover, in this embodiment, as shown in FIG. 2, the outflow prevention hardware 13 is arranged in the back side plate 11 a among the steel sheet piles 11 that are continuously arranged and constitute the cutoff wall 10 at each installation location (the cutoff side). Installed so as to straddle the back plate 11a of a pair of steel sheet piles 11 arranged on the outside (river 20 side) adjacent to both sides of the steel sheet pile 11 arranged on the work space 22 side) By doing so, a pair of joint portions 12 between the steel sheet pile 11 with the back plate 11a disposed inside and the pair of steel sheet piles 11 disposed with the back plate 11a on both sides thereof are paired. It attaches in the state enclosed simultaneously from the outer side of the cutoff wall 10 by the outer side additional leg part 14 and the partition surface board part 15. FIG.

  As a result, the flow rate of the river 20 is as high as about 2 m / sec, for example, in the water adjacent to the joint portion 12 outside the cutoff wall 10 surrounded by the outflow prevention hardware 13 at each installation location. Nevertheless, it is possible to maintain a calm state. The clogging material is thrown into the calm water surrounded by the outflow prevention hardware 13 so that the clogging material that has been put in is kept in the water outside the cut-off wall 10 in the vicinity of the joint portion 12 without flowing out. Thus, the clogging material that has been put on the flow of water flowing into the cutoff work space 22 through the gap of the joint portion 12 due to a water head difference between the cutoff work space 22 and the water surface outside the cutoff wall 10 is obtained. It can be smoothly drawn into the gap of the joint portion 12.

  In the present embodiment, the clogging material introduced into the water in the portion adjacent to the joint portion 12 is preferably made of, for example, a granular material, a piece, or a thread having a specific gravity smaller than that of water, and has a specific gravity higher than that of water. After being settled by being poured into water in a state of being mixed with a large weight auxiliary material, a mixture is used in which the mixed state varies and floats in water.

  Moreover, it is particularly preferable to use a material made of sawdust as a clogging material and thrown into water in a state of being mixed with sand or earth as a weight auxiliary material. That is, for example, commercially available sawdust that has been purchased in a bag and is in the form of granules or flakes is unwound on mountain sand, for example, the mixing ratio of sawdust and mountain sand in an apparent volume ratio of 1: The clogging material mixed with the weight auxiliary material can be easily formed by adding about 2 and mixing appropriately. If the amount of mountain sand is insufficient, the sawdust becomes difficult to settle in the water together with the mountain sand. The clogging material obtained by mixing sawdust and mountain sand can be packed in a sandbag and carried in, for example, in the form of a dumpling.

  The clogging material poured into the water outside the cutoff wall 10 adjacent to the joint portion 12 in a state mixed with the weight auxiliary material, for example, from a sandbag, preferably settles down to the bottom of the water at a stretch. While the mixed state is varied and the sawdust and the like are floated, the flow of water flowing into the shutoff work space 22 through the gap of the joint portion 12 due to the water head difference between the shutoff work space 22 and the water surface outside the shutoff wall 10. By putting the sawdust and the like into the gap of the joint portion 12, the gap can be clogged with a clogging material, and the amount of water leaked into the closing work space 22 can be effectively suppressed. Become.

  When the water stop work for the joint portion 12 by putting the clogging material into the water is completed at the installation location of the outflow prevention hardware 13, install the outflow prevention hardware 13 at the other installation location of the cutoff wall 10, etc. For the joint portion 12, the amount of water leaking into the shut-off work space 22 is effectively suppressed over the entire shut-off wall 10 by repeating the work process of throwing the same clogging material into the water. Is possible.

  Therefore, according to the present embodiment, for example, a granular material, a piece, or a thread having a specific gravity smaller than that of water made of sawdust is used as a clogging material, for example, a weight auxiliary material having a larger specific gravity than water made of sand or soil. By using an inexpensive material that is simply mixed with water, the gap between the joint portions 12 of the adjacent steel sheet piles 11 is clogged by a simple operation of simply throwing them into the water, and the water stoppage of the cutoff wall 10 is confirmed. Can be easily improved.

  Further, in this embodiment, when a simple treatment with, for example, polyfilm, camber, water expansion rubber, waste cloth, or the like is performed on the joint portion 12, for example, a water leak of about 600 liters per minute may occur. Leakage of about 30 liters per minute is almost eliminated, and it is possible to reduce the number of pumps and the excavation points of the potyard. In addition, the amount of water leakage to be treated can be reduced, and it is possible to treat water leakage at a low cost with a simple treatment facility, and no special work such as diving or waterproofing is required, making it easy and reliable. It becomes possible to reduce the amount of water leakage.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to install the outflow prevention hardware in the water so that the joint portion is surrounded from the outside of the cutoff wall, and even if the outflow prevention hardware is not installed, the water in the part adjacent to the joint portion is in a calm state Can be held, the present invention can be carried out only by throwing the clogging material into the water in the vicinity of the joint. In addition, the construction work section and the cutoff wall are not necessarily formed in the river, and may be formed in other water areas such as the sea, lake, pond, and swamp. Furthermore, it is not always necessary to attach the outflow prevention hardware in a state of surrounding two joint portions at the same time, and it is also possible to attach the outflow prevention hardware in a state of surrounding one joint portion or three or more joint portions.

DESCRIPTION OF SYMBOLS 10 Cut wall 11 Steel sheet pile 12 Joint part 13 Outflow prevention metal part 14 Outer side attachment leg part 14a Additional edge part 15 Partition surface board part 16 Inner side attachment leg part 17 Connection joint part 18 Lifting latching part 20 River 21 Construction work section 22 Deadline working space 24 Channel steel 24a Side flange 24b Intermediate plate part L More than the height from the bottom of the water to the top of the steel sheet pile s Greater than the thickness of the steel sheet pile

Claims (4)

By constructing a number of steel sheet piles that are driven from the surface of the water toward the bottom of the water, the construction work zone is pumped up by pumping up the water inside the cut-off wall formed around the construction work zone. Is a steel sheet pile joint water-stop method that suppresses the surrounding water from flowing into the cut-off work space from the joint portion of each adjacent steel sheet pile,
Surrounding the joint part from the outside of the cut-off wall, and installing an outflow prevention hardware in the water in the vicinity of the joint part,
A clogging material is poured into the water surrounded by the outflow prevention hardware outside the cutoff wall in a portion adjacent to the joint portion, and due to a water head difference between the cutoff working space and the water surface outside the cutoff wall. The clogging material is pulled by the clogging material by drawing the clogging material that has been introduced into the crevice space of the joint portion and drawing the clogging material into the crevice space of the fitting portion. A steel sheet pile joint water stop method that suppresses the amount of water leaked into the deadline working space. The clogging material is composed of granular materials, flakes, or filaments having a specific gravity smaller than that of water, and is poured into water in a state of being mixed with a weight auxiliary material having a specific gravity greater than that of water, and then submerged. joints waterproofing method of claim 1 Symbol mounting sheet piles mixing status is intended to float only rose in. 3. The steel sheet pile joint water stop method according to claim 2 , wherein the clogging material is made of sawdust and poured into water in a state of being mixed with sand or earth as a weight auxiliary material. It is an outflow prevention hardware used for the joint part water stop construction method of the steel sheet pile according to any one of claims 1 to 3 ,
A pair of outer supplementary leg portions having a length equal to or higher than a height from a water bottom surface to an upper end of the steel sheet pile, which are arranged in a longitudinal direction along an outer peripheral surface of the steel sheet pile constituting the cutoff wall; A partition surface plate portion disposed at a distance from the joint portion, provided by connecting a portion of the pair of outer additional leg portions opposite to the additional edge portion; and the pair of outer additional leg portions. A pair of inner additional leg portions arranged in parallel with the outer additional leg portions, respectively, in a state where a gap larger than the thickness of the steel sheet pile is maintained between An outflow prevention hardware comprising a connecting joint for connecting and integrating the inner auxiliary leg and the pair of outer additional legs at their upper ends, and a lifting lock provided at the upper end.

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