JP6688263B2 - Temporary cutoff method, temporary cutoff structure, support work, support work unit - Google Patents

Description

  The present invention relates to a temporary shutoff method for a water area, a temporary shutoff structure, and a supporting work and a supporting work unit used therefor.

  When constructing a structure such as a bridge pier in the water area, a temporary cut-off body such as a steel pipe sheet pile is laid in the shape of a well to cut off the water area, and the ground inside is excavated to a predetermined depth and dried up, then the structure May be built. A supporting work is installed inside the temporary cutoff body to resist the water pressure of the surroundings (see, for example, Patent Documents 1-3).

  In this case, the upper-stage support work is installed while lowering the water level inside the temporary shutoff body, then the ground level is excavated to a predetermined depth while keeping the water level constant, and then the remaining support work is sequentially performed while lowering the water level. Supporting work is often installed by the procedure of installation.

  FIG. 23 (a) is a diagram showing an outline of the support work 100, and FIG. 23 (b) is a view of FIG. 23 (a) seen from above. 23 (a) and 23 (b) show a state in which the installation of all the supporting works 100 has been completed.

  In the example of FIG. 23, the supporting works 100 are arranged in a plurality of upper and lower stages inside the water area 3 which is closed by the steel pipe sheet pile 4 in a tubular shape, and the upper and lower supporting works 100 are intermediate piles in which the lower end portion is embedded in the ground 2 at the bottom of the water. Supported by 110. The flat surface of the support work 100 has a shape in which the uprising members 101 are arranged along the inner circumference of the well made of the steel pipe sheet pile 4, and the cutting beams 102 are provided between the uprising members 101 at the opposite positions. The cutting beams 102 are provided in a grid pattern in the vertical and horizontal directions, and a firing 103 is provided at a connecting portion between the cutting beams 102 and the uprising 101.

JP 4-155010 A Patent No. 2949341 Patent No. 3051321

  However, in such a structure of the supporting structure 100, since the spacing between the beams 102 is small and there is no large opening, it is easy to interfere with other work. For example, when a structure is constructed, long rebars cannot be carried in, and short rebars are often connected by joints. In addition, it is necessary to limit the length of materials such as single pipes used for formwork when placing concrete. Further, in other work such as excavation, the cutting beam 102, the fire hammer 103, etc. become a hindrance, and the work efficiency is deteriorated.

  Further, the interference between the intermediate pile 110, the cutting beam 102, etc. and the reinforcing bar of the structure is apt to occur, and at such a place, a hole is made in the steel material of the intermediate pile 110, the cutting beam 102, etc. to pass the reinforcing bar, or the reinforcing bar is cut. It is necessary to reinforce the openings, but in either case, it may cause a defect in the structure such as insufficient concrete filling. Further, at a place where the intermediate pile 110 penetrates the structure, it is necessary to take measures such as unboxing the structure. Although cross-section repair will be performed at this point later, it may be a weak point in durability performance.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a temporary deadline method and the like that contribute to the improvement of the workability at the time of constructing a structure in a water area and the quality of the structure.

A first aspect of the present invention for solving the above-mentioned problems includes a step of closing a water area by a closed region formed by a temporary cutoff body, and a step of installing a support work inside the temporary cutoff body. said central portion being arranged annularly along the inner periphery of the provisional deadline body has an opening, and have a truss structure in the plane, Matsume portion is provided between said temporary deadline body and the shoring is the inter-packed portion is perforated and precast blocks arranged on an outer peripheral portion of the shoring, the said precast blocks provided on the surface of the provisional deadline side, and a bag to be filled with a filler This is a temporary deadline method.
It is desirable that the bag body be inflated so as to be in close contact with the shape of the temporary cutoff body by filling the bag body with the filling material after the support work is installed.

  According to the present invention, since the supporting work has a truss structure in a plane to enhance rigidity, it is possible to provide a large opening at a construction site of the structure in the center of the inside of the temporary cutoff body, and the interference between the structure and the supporting work is eliminated. . In addition, it is possible to insert long rebars and large formwork etc. from the large opening, the size restriction of input materials is small, and the work environment is greatly improved by using the large opening. Can be achieved. As a result, the workability at the time of constructing the structure and the quality of the structure are improved, and the construction period is shortened.

It is desirable that the supporting works are installed in a plurality of upper and lower stages. Further, it is preferable that at least two stages of the support work are connected vertically by a truss structure.
By installing a plurality of supports vertically inside the temporary shutoff body, it is possible to resist a large water pressure. Also, by connecting the upper and lower supports with a truss structure, the rigidity is increased, and the above-mentioned intermediate piles are unnecessary, and the interference between the structure and the intermediate piles does not occur, so the workability of the structure is improved and the structure The quality is improved and durability can be easily secured.

It is desirable to lower the support unit in which at least two stages of the support work are connected vertically by a truss structure, and to install the support unit inside the temporary cutoff body.
Even if the number of support work installation steps is large, by installing the support work units that have been assembled on the ground in advance, the number of on-site work processes can be reduced and the construction period can be shortened. You can

In addition, a supporting unit having a truss structure above or below the supporting structure is lowered and installed inside the temporary cutoff body, and then another supporting structure is attached to the truss structure of the supporting unit. Installation is also desirable.
Also in this case, by using the support work unitized, the effect of shortening the construction period can be obtained.

It is also preferable that the supporting work is used as an annular shape by joining a part of flat surfaces.
As described above, by using the support work, which is divided into small pieces on the plane, by joining the support work at the site, the burden of carrying the support work can be reduced.

It is preferable to construct the bottom plate at the bottom of the excavation after underwater excavation of the ground inside the temporary cutoff body while leaving the guide frame when the temporary cutoff body is placed on the ground.
By performing the underwater excavation before the water level inside the temporary shutoff body is lowered, deformation of the temporary shutoff body at the time of excavation can be suppressed and large-scale reinforcement is not necessary. Therefore, it is easy to realize a large opening during excavation by using the guide frame at the time of placing the temporary cutoff body for reinforcement work, the risk of damage to the reinforcement work due to contact with the excavator is reduced, and underwater excavation becomes difficult. There is no place to be improved, and work efficiency during excavation is improved. Further, after the bottom plate is constructed, deformation can be suppressed by holding the temporary closed body between the guide frame and the bottom plate, and the risk that the temporary closed body is greatly deformed due to variations in the physical properties of the ground is reduced.

It is preferable that a partition is formed inside the temporary block, the ground inside the temporary block is excavated, and then a predetermined position of the partition is cut to remove the upper portion.
The provision of the partition enhances the stability of the temporary cutoff body. Further, since the partition wall is cut after excavation, not before excavation of the ground, there is no risk of damaging the head of the partition wall after excavation, and the partition wall can be preferably used as a foundation of a structure. In addition, it is easy to remove because it is not necessary to pull out the partition wall from the soil.

A second aspect of the present invention includes a temporary shut-off body that forms a closed region and shuts off a water area, and a support work installed inside the temporary shut-off body, wherein the support work is an inner circumference of the temporary shut-off body. along the central portion disposed annularly has an opening, and a truss structure possess in plan, Matsume portion is provided between said temporary deadline body and the shoring, the inter-packed portion, the A precast block arranged on the outer peripheral portion of the support work, and a bag body provided on the surface of the precast block on the side of the temporary cutoff body, and by filling the bag body with a filler, the bag body is temporary deadline structures characterized by Rukoto not inflated so as to be in close contact with the shape of the provisional deadline body.
It is desirable that the supporting works are installed in a plurality of upper and lower stages. Further, it is preferable that at least two stages of the support work are connected vertically by a truss structure.

The third invention is a shoring used for temporary deadline structure Shimekiri' the water by closed area by the temporary shut-off member, the plane has become central portion an opening in annular, and have a truss structure in a plane the shoring outer periphery precast blocks are arranged in the a shoring the bag for filling the filling material in front, characterized in Rukoto provided in the precast block.

A fourth invention is a supporting unit in which a truss structure is provided above or below the supporting work of the third invention.
Further, it is desirable that at least two stages of the support work are connected vertically by a truss structure.

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a temporary deadline method, etc. that contributes to the workability in constructing a structure in a water area and the quality of the structure.

Figure explaining the deadline of water area 3 Diagram for explaining excavation of the ground 2 Diagram showing truss support 1 and support unit 10 Diagram explaining the installation of truss support 1 The figure explaining installation of truss support work 1 and construction of bridge piers 74 etc. Diagram explaining the construction of piers 74, etc. The figure which shows the temporary deadline structure 20 '. The figure which shows the support work unit 10 ' The figure explaining the installation procedure of the support work in 2nd Embodiment. The figure which shows the attachment part of the support material 7, and the support material receiving part 4a. The figure explaining the installation method of the bracket 8 '. Figure explaining the packing method Diagram showing truss support 1a and support unit 10a The figure explaining the installation procedure of the support work in 3rd Embodiment. The figure explaining the installation procedure of the support work in 3rd Embodiment. The figure explaining the installation procedure of the support work in 4th Embodiment. The figure explaining the installation procedure of the support work in 4th Embodiment. The figure explaining the installation procedure of the support work in 5th Embodiment. The figure explaining the installation procedure of the support work in 5th Embodiment. The figure explaining the installation procedure of the support work in 6th Embodiment. The figure explaining the installation procedure of the support work in 6th Embodiment. Diagram showing positioning of truss support 1 The figure which shows the outline of the support work 100

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, the procedure of the temporary shutoff method according to the first embodiment of the present invention will be described. In the present embodiment, first, as shown in FIG. 1 (a), a steel pipe sheet pile 4 which is a temporary shut-off body is driven into the ground 2 at the bottom of the water to form a closed area in a plane, and the water area 3 to be constructed is closed. . The steel pipe sheet pile 4 is provided in the shape of a well as shown in FIG. FIG. 1B is a view of FIG. 1A viewed from above.

  In this example, inside the well (closed region) formed by the steel pipe sheet pile 4, the steel pipe sheet pile 5 is cast on the ground 2 at the bottom of the water to form a partition wall. The steel pipe sheet piles 5 are arranged in a row so as to connect a pair of opposing sides of the well pipe formed by the steel pipe sheet piles 4. If necessary, in the predetermined vertical section of the steel pipe sheet piles 4 and 5 (for example, the section from the top slab concrete to the vicinity of the pavement layer, which will be described later, or the lower end portions of the steel pipe sheet piles 4 and 5), rebar is placed in the steel pipe and the concrete It is also possible to reinforce by filling with. Although not shown, adjacent steel pipe sheet piles 4 and 5 are connected to each other by a joint, and the joint portion of the steel pipe sheet pile 4 forming the well is subjected to a water stop treatment.

  The steel pipe sheet piles 4 and 5 are placed using the guide frame 6. The guide frame 6 includes an outer frame 6a arranged along the outer circumference of the well pipe made of the steel pipe sheet pile 4, and two inner frames 6b arranged along both sides of the inner circumference of the well pipe made of the steel pipe sheet pile 4 and the partition wall made of the steel pipe sheet pile 5. Composed of. A diagonal member 61 is arranged at the corner of each inner frame 6b. After driving the steel pipe sheet piles 4 and 5, the guide frame 6 is attached to the tops of the steel pipe sheet piles 4 and 5.

  After that, as shown in FIG. 2 (a), the ground 2 inside the well with the steel pipe sheet pile 4 is underwater excavated to a predetermined depth while maintaining the water level, and a paving stone layer 71 and a bottom concrete 72 are constructed at the bottom of the excavation. Underwater excavation is carried out by installing an excavator such as a grab on a crane of a dredger (not shown). The steel pipe sheet pile 5 is cut at a position (predetermined position) corresponding to the upper surface of the bottom concrete 72 after excavating the ground 2 and placing the bottom concrete 72, and the upper portion is removed.

  In the present embodiment, excavation of the ground 2 is performed with the guide frame 6 left, and after the excavation, the inner frame 6b is removed so as not to hinder the installation of the support work described later. Thereby, when excavating the ground 2, the guide frame 6 is made to function as a reinforcement work for suppressing deformation of the steel pipe sheet pile 4 against traveling waves and the like generated by a ship traveling around. After constructing the bottom concrete 72 and removing the inner frame 6b, the steel pipe sheet pile 4 is held by the outer frame 6a and the bottom concrete 72, and deformation of the steel pipe sheet pile 4 or the like is suppressed.

  Further, in order to install a support work described later, a first stage bracket 8 (which means the number of stages when counted from below; the same applies hereinafter) is formed. The bracket 8 is made of a steel material, and as shown in FIG. 2B, a bracket body 82 having a substantially U-shape is attached to a linear bracket receiving member 81 joined to the steel pipe sheet pile 4 by underwater welding or the like. By attaching using (not shown), a substantially right triangle shape is formed. A bracket receiving material 81 is previously attached to the formation position of the bracket 8 of the second stage described later.

  After this, the supporting work is installed. In this embodiment, the truss supporting work 1 shown in FIG. 3A is used as the supporting work. The truss support 1 has a substantially square V-shaped annular plane, and has a large-area opening 15 in the center. The flat surface of the truss support 1 has a truss structure in which a plurality of vertical members 11 and horizontal members 12 are combined in a lattice shape and diagonal members 14 are provided in the lattice. The diagonal members 14 are also provided at the four corners of the opening 15.

  In this embodiment, as shown in FIG. 3 (b), a supporting unit 10 in which the truss supporting members 1 are combined in two upper and lower stages is assembled and manufactured in advance on the ground or on the water. The upper and lower two-stage truss support works 1 are connected by a truss structure including a plurality of vertical members 16 and diagonal members 17. The diagonal members 17 are arranged in a substantially X shape between the adjacent vertical members 16. Steel materials such as H-section steel are used for the vertical member 16 and the diagonal member 17, and for the vertical member 11, the horizontal member 12, and the diagonal member 14 described above.

  The support unit 10 is carried into the site, hung down from above by a crane (not shown) of a hoist ship, and lowered, and installed on the first stage bracket 8 as shown in FIG. 4 (a). As shown in FIG. 4 (b), the steel pipe sheet piles 4 are annularly arranged along the inner circumference of the well. FIG. 4B is a view of FIG. 4A viewed from above. Further, the truss support 1 and the steel pipe sheet pile 4 are packed (not shown) with concrete or mortar. Although omitted in the following description, the above-mentioned padding is performed at the time of installing each truss support (supporting unit) described later.

  Next, as shown in FIG. 5A, the bracket 8 of the second stage is formed above the supporting and supporting unit 10. As described above, the bracket receiving member 81 is previously attached to this position, and the bracket 8 is formed by attaching the bracket main body 82 to the bracket receiving member 81.

  After this, as shown in FIG. 5B, the supporting and supporting unit 10 is installed on the second stage bracket 8 in the same procedure as described above. As a result, a temporary shut-off structure 20 is formed in which the upper and lower four-tier truss support works 1 are installed in two units inside the well made of the steel pipe sheet pile 4. In the example shown in the figure, the truss support 1 at the lower stage of each support unit 10 is placed on and supported by the bracket 8, but the bracket 8 is placed at a position corresponding to the truss support 1 at the upper stage of each support unit 10. It may be provided and further supported by the bracket 8.

  After forming the temporary deadline structure 20 in this manner, the construction of the structure is started. In this embodiment, a bridge pier is constructed as a structure on top concrete. Therefore, as shown in FIG. 5C, the steel pipe sheet pile 4 drains the inside of the well to dry it up, and the top concrete 73 made of reinforced concrete is constructed on the bottom concrete 72.

  Then, in the opening 15 of the truss support 1 (see FIG. 3A), a pier 74 made of reinforced concrete is constructed on the top slab concrete 73 as shown in FIG. 5D. The support work unit 10 is removed according to the progress of the work. FIG. 5 (d) shows a state after removing the lower support unit 10. After this, as shown in FIG. 6A, water is injected into the steel pipe sheet pile 4, and the supporting and supporting unit 10 and the outer frame 6a are all removed.

  After that, the steel pipe sheet pile 4 is backfilled with earth and sand to remove the steel pipe sheet pile 4. The steel pipe sheet pile 4 can be used as a pier foundation together with the steel pipe sheet pile 5 by cutting the steel pipe sheet pile 4 at a position corresponding to the upper surface of the top slab concrete and removing only the upper portion thereof. This state is shown in FIG.

  As described above, in the present embodiment, the rigidity is increased by using the truss supporter 1 having a truss structure in a plane as the supporter, and the steel pipe sheet pile 4 is used to construct a structure such as a pier 74 at the center of the inside of the well. A large opening can be provided, and the interference between the structure and the truss support 1 is eliminated. In addition, it is possible to insert long rebars and large formwork etc. from the large opening, the size restriction of input materials is small, and the work environment is greatly improved by using the large opening. Can be achieved. As a result, the workability at the time of constructing the structure of the water area 3 and the quality of the structure are improved, and the construction period is shortened.

  Further, in the present embodiment, by installing the truss support 1 in a plurality of upper and lower stages inside the well with the steel pipe sheet pile 4, it is possible to resist a large water pressure. In addition, by connecting the upper and lower two-tier truss support structure 1 by the truss structure, the rigidity is increased, and the intermediate pile as described above is not required, and the interference between the structure such as the pier 74 and the top slab concrete 73 and the intermediate pile. Does not happen. As a result, the workability of the structure is improved, the quality of the structure such as the concrete filling property is improved, and the durability can be easily secured.

  Further, in the present embodiment, the support unit 10 in which the truss support 1 is connected in the vertical direction in advance by the truss structure is lowered and installed inside the well by the steel pipe sheet pile 4. Therefore, even if the truss support work 1 has a large number of installation stages, the support work unit 10 assembled in advance on the ground or the like is collectively installed, thereby omitting the underwater joining work and reducing the on-site work man-hours to shorten the on-site construction period. It can be shortened. In addition, the risk of accidents due to work in high places and up / down work can be reduced.

  Furthermore, in the present embodiment, by performing underwater excavation before the water level inside the well pipe is lowered by the steel pipe sheet pile 4, deformation of the steel pipe sheet pile 4 at the time of excavation can be suppressed, and large-scale reinforcement is not necessary. Therefore, the guide frame 6 at the time of placing the steel pipe sheet piles 4 and 5 is used for the reinforcement work, and it is easy to realize a large opening at the time of excavation, and the risk of damage to the reinforcement work due to contact with the excavator is reduced. The work efficiency at the time of excavation is improved because there is no place where it becomes difficult. Further, after the bottom concrete 72 is constructed, the steel pipe sheet pile 4 can be restrained from being deformed by holding the steel pipe sheet pile 4 by the outer frame 6a of the guide frame 6 and the bottom concrete 72, and the deformation of the steel pipe sheet pile 4 becomes large due to the variation of the ground physical properties. The risk is also reduced.

  Further, in the present embodiment, by providing the partition with the steel pipe sheet pile 5, the stability of the well pipe by the steel pipe sheet pile 4 is enhanced, and the steel pipe sheet pile 5 is cut after excavation, not before excavation of the ground 2. There is no fear of damaging the head during excavation, and the steel pipe sheet pile 5 can be suitably used as a foundation for structures such as piers 74. Further, since it is not necessary to pull out the steel pipe sheet pile 5 from the soil, the steel pipe sheet pile 5 can be easily removed, and it is possible to reduce the specifications of the hoist ship when the steel pipe sheet pile 5 is lifted by a crane or the like.

  However, the present invention is not limited to this. For example, in the present embodiment, the dry-up is performed after the truss support 1 is installed, but the water level may be lowered before all the truss support 1 are installed. For example, it is possible in some cases to install the truss supporter 1 sequentially from the top every time the water level is lowered to a predetermined depth. Further, in the present embodiment, the ground 2 is excavated with the guide frame 6 left, but it is also possible to remove either or both of the outer frame 6a and the inner frame 6b of the guide frame 6 before excavation. Further, in some cases, excavation of the ground 2 may be omitted.

  Further, in the present embodiment, the upper and lower truss support works 1 are connected to each other by the truss structure of the vertical member 16 and the diagonal member 17 for use in the construction, and the upper and lower four-stage truss support works 1 are installed. There is no limit. For example, as shown in the temporary shut-off structure 20 'of FIG. 7, it is possible to install each of the plurality of stages of truss supporters 1 independently without connecting them. In this example, the truss support 1 of each stage is sequentially hung individually, and the truss support 1 is supported at the installation position of the truss support 1 of each stage by the bracket 8 formed as described above. Furthermore, the number of steps of the truss support work 1 can also be set to any number of steps of 1 or 2.

  Further, the steel pipe sheet pile 4 only needs to form a closed region in a plane, and is not limited to the well pipe that closes the water area 3. For example, the water area 3 may be closed in a cylindrical shape. In this case, the plane of the truss support work may be a substantially circular annular plane. Further, instead of the steel pipe sheet pile 4, a steel sheet pile or other member may be used as a temporary cutoff body.

  Hereinafter, another example of the present invention will be described as second to sixth embodiments. Each embodiment will be described about different points from the embodiments described above, and similar points will be denoted by the same reference numerals in the drawings and the like, and description thereof will be omitted. Further, the configurations described in the respective embodiments including the first embodiment can be used in combination as necessary.

[Second Embodiment]
As a second embodiment, a temporary deadline method for further reducing the underwater work at the time of installing the support work will be described. In the present embodiment, as shown in FIG. 8, the upper and lower truss supports 1 are connected by the truss structure in which the horizontal members 18 are provided above and below the vertical members 16 and the diagonal members 17, and are used as a supporting unit 10 '. A steel material such as an H-shaped steel is used as the horizontal member 18. The plane of the horizontal member 18 has a rectangular frame shape.

  In the present embodiment, as shown in FIG. 9 (a), the support unit 10 'is suspended from a crane or the like (not shown) of a hoist ship with the rod-shaped support member 7 attached to the support unit 10'. Lower and lower. The support member 7 is made of a full-threaded steel rod, and is arranged so as to incline toward the inside as it goes downward. When the supporting unit 10 'is lowered, a guide (not shown) for positioning on the plane of the supporting unit 10' is also attached to the steel pipe sheet pile 4 and used.

  FIGS. 10A and 10B are views showing the mounting portion of the support member 7. FIG. 10 (a) is a view showing a cross section orthogonal to the longitudinal direction of the vertical member 11 (see FIG. 3 (a)) on the outer peripheral portion of the truss support 1 at the upper part of the support / support unit 10 ', and FIG. 4] is a view showing a cross section in the longitudinal direction of the vertical member 11. 10A is a cross section taken along line BB of FIG. 10B, and FIG. 10B is a cross section taken along line AA of FIG. 10A.

  As shown in the figure, in this embodiment, the support member 7 is a horizontal truss structure that connects the vertical member 11 on the outer periphery of the upper truss support 1 of the support unit 10 'and the upper and lower truss support 1 to each other. It is attached to the material 18.

  The supporting member 7 is passed through the web of the vertical member 11 (H-shaped steel) and the holes (not shown) of the washers 111 provided on the upper and lower sides of the web, and on the lower surface of the lower washer 111 and the upper surface of the upper washer 111. The nut 112 is tightened.

  The lower end of the support member 7 projects downward from the vertical member 11 and is passed through the web of the horizontal member 18 (H-shaped steel) and the holes (not shown) of the washers 181 provided above and below the web, and The nut 182 is tightened on the lower surface of the washer 181 and the upper surface of the upper washer 181. The lower surfaces of the lower washers 111 and 181 of the vertical member 11 and the horizontal member 18 and the upper surfaces of the upper washers 111 and 181 of the vertical member 11 and the horizontal member 18 are inclined surfaces orthogonal to the inclination of the support member 7.

  10 (a) and 10 (b) show an attaching portion in which the supporting member 7 is attached to the vertical member 11 on the outer peripheral portion of the truss support 1 but the horizontal member 12 (see FIG. With respect to (a)), the support member 7 is attached with the same configuration. Further, in the vertical member 11, the horizontal member 12, and the horizontal member 18, a rib for reinforcement (not shown) for connecting both flanges of the H-section steel and the web may be provided near the mounting portion of the support member 7, if necessary. Is provided.

  In the present embodiment, a plurality of steel rods as the support member 7 are sequentially added by a coupler (not shown) or the like, and the supporting unit 10 'is lowered to a predetermined position as shown in FIG. 9B. The position (height) of the supporting and supporting unit 10 'can be ascertained by the measuring tape (not shown) attached to the supporting and supporting unit 10', the length and the number of added steel rods, and the like.

  When the supporting and supporting unit 10 ′ is arranged at a predetermined position, the upper end portion of the support material 7 is held by the support material receiving portion 4 a provided on the upper end of the steel pipe sheet pile 4. FIG. 10 (c) is a view showing this support material receiving portion 4a. As shown in FIG. 10C, the support material receiving portion 4a includes a passing steel material 41, a height adjusting material 42, a center hole jack 43, and the like.

  The passing steel material 41 is an H-shaped steel bridged between the adjacent steel pipe sheet piles 4, and in the portions corresponding to the steel pipe sheet piles 4, notches 412 are provided in the upper and lower flanges. The upper end portion of the support member 7 is arranged between the adjacent steel pipe sheet piles 4 and is passed through the cutout portion 412.

  A washer 413 is arranged on the upper flange of the passing steel material 41 so as to straddle the notch 412. The washer 413 is fixed on the flange by a slip stopper (not shown) or the like. The upper surface of the washer 413 is an inclined surface orthogonal to the inclination of the support member 7, and a pedestal 414 for installing the center hole jack 43 is provided on the upper surface. The passing steel material 41 is also provided with reinforcing ribs (not shown) for connecting both flanges of the H-shaped steel and the web, if necessary.

  The height adjusting member 42 is for adjusting the height of the passing steel member 41, and is attached to the side surface of the upper end portion of the steel pipe sheet pile 4. Channel height steel or the like is used for the height adjusting member 42, and is provided so as to support the lower flange of the passing steel member 41.

  The center hole jack 43 holds the support member 7 and adjusts the tension of the support member 10 'in order to suspend and support the support unit 10'. The upper end of the support member 7 is passed through the washer 413, the pedestal 414, and the hole (not shown) of the center hole jack 43, and is fastened to the plate 431 on the upper surface of the jack with the nut 432.

  In the present embodiment, the supporting unit 10 'is supported by the support member 7 from a plurality of locations (for example, about 20 locations). The tension of the support members 7 at this time is appropriately controlled so as not to exceed the control value, and finally adjusted so that all the support members 7 have the same tension.

  After the support unit 10 'is installed in this manner, the bracket 8'is installed above the support unit 10' as shown in FIG. 9C.

  FIG. 11 shows a method of installing the bracket 8 '. In this embodiment, as shown in FIG. 11 (a), the bracket receiving member 81a is a long one made of channel steel or the like, and a bracket main body 82 similar to the above is joined to the lower end thereof in the air by welding or the like. Has been done. The bracket receiving member 81a is temporarily supported by a hook portion 83 such as a hook provided on the upper end of the steel pipe sheet pile 4.

  This bracket 8'is suspended by a wire (not shown) or the like and lowered along the steel pipe sheet pile 4, the bracket main body 82 is arranged at a predetermined position as shown in FIG. 11 (b), and the bracket receiving material 81a is placed on the water. The steel pipe sheet pile 4 is welded and fixed at the welded portion 84. When the bracket 8'is lowered, the height of the upper end of the bracket receiving material 81a is measured in advance to grasp the position (height) of the bracket main body 82 from the measured value and the member length of the bracket receiving material 81a. You can do the work.

  After the bracket 8'is thus installed, the new supporting unit 10 'is hung and lowered similarly to the above, and is placed on the bracket 8' (bracket body 82) as shown in FIG. 9 (d). . For safety reasons, it is possible to form a bracket similar to the bracket 8 at a position for supporting the uppermost truss support structure 1.

  In the present embodiment, finally, the space between the truss support 1 of each stage and the steel pipe sheet pile 4 is packed. Except for the truss support work 1 at the uppermost stage, in this embodiment, the packing is performed in water. FIG. 12A is a diagram showing a padding method in water. In this embodiment, as shown in the left diagram of FIG. 12A, a precast block 31 is hooked with a hook 32 and arranged on the flange surface of the vertical member 11 on the outer peripheral portion of the truss support 1. The precast block 31 is arranged across the flange surface of the vertical member 11 and the flange surface of the horizontal member 18, and a bag body 34 having an opening at the top is provided on the front surface thereof. As shown in the right figure, when the filling material 33 such as mortar or concrete is filled into the bag body 34, the bag body 34 swells so as to be in close contact with the shape (cylindrical shape) of the steel pipe sheet pile 4.

  As a result, as shown in FIG. 12B, the space between the vertical member 11 (and the above-described horizontal member 18) on the outer peripheral portion of the truss support 1 and the steel pipe sheet pile 4 is narrowed. The transverse members 12 on the outer peripheral portion of the truss support 1 are also stuffed by the same method, and a plurality of such stuffed portions are provided between the truss support 1 and the well pipe made of the steel pipe sheet pile 4.

  As described above, a temporary shut-off structure 20 ″ (see FIG. 9 (d)) is formed in which the upper and lower four-stage truss supporters 1 are annularly arranged along the inner circumference of the well by the steel pipe sheet pile 4. The work procedure before and after the installation is the same as that of the first embodiment, and the same effect as that of the first embodiment can be obtained in this embodiment as well. By using it, there is an advantage that the burden of underwater work can be further reduced.

  Note that the filling method is not limited to the example of FIG. 12, and for example, a form is installed between the vertical member 11 or the horizontal member 12 and the steel pipe sheet pile 4 on the outer periphery of the truss support 1 in water to fill the filling material. Alternatively, a bag similar to the bag 34 may be attached to the vertical member 11 or the horizontal member 12 and the bag may be filled with the filling material. However, the former method requires that the formwork be installed in water and has low workability, and the latter method may cause the bag body to hang down when filling the filling material and may not be able to be filled successfully, and the above method does not solve these problems. It is advantageous in reducing it.

[Third Embodiment]
In the third embodiment, as shown in FIG. 13 (a), a pair of truss supporters 1a obtained by dividing the truss supporter 1 in half in a plane is used, and parts of these planes are joined in a step described later. , Which is a substantially square-shaped annular plane.

  As shown in FIG. 13 (b), each truss support 1a has a truss structure composed of a vertical member 16 and a diagonal member 17 attached to the upper portion thereof to form a pair of support units 10a. The support unit 10a is assembled and manufactured in advance on the ground or on the water, and is carried to the site for use.

  14 and 15 are views for explaining the installation procedure of the support work in the third embodiment. In this embodiment, at the time of installation of shoring, as shown in FIG. 14 (a), first, a work barge 9 is arranged on the water and the pair of shoring units 10a are assembled to form a weld or bolt. To join them in the air to form a substantially square V-shaped annular flat surface similar to that of the first embodiment. A temporary bracket 8a is provided on the top of the steel pipe sheet pile 4, and the supporting unit 10a is installed thereon. The bracket 8a can be installed by hooking it on the top of the steel pipe sheet pile 4 with a hooking portion (not shown).

  Further, the first stage bracket 8 is formed in the same manner as in the first embodiment, and a bracket receiving material 81 (see FIG. 2B) is preliminarily attached to the formation positions of the second to fourth stage brackets 8 described later. Keep it.

  The supporting unit 10a is hung by a wire using a hanging mechanism (not shown) such as a winch provided on the top of the steel pipe sheet pile 4, and is placed on the first bracket 8 as shown in FIG. 14 (b). To install. When suspending the supporting unit 10a, the temporary bracket 8a is temporarily moved to a position that does not hinder the suspending, and after the supporting unit 10a is suspended, it is returned to the original position.

  After that, as shown in FIG. 14C, a pair of supporting and supporting units 10a are grounded and joined in the same manner as described above on the ship 9. Further, the bracket 8 of the second stage is formed in the same manner as in the first embodiment.

  The support work unit 10a, which has been grounded, is hung by the same procedure as above, and is installed on the bracket 8 of the second stage as shown in FIG. 14 (d). Then, the truss support 1a (another support) of the support unit 10a is attached to the upper end of the vertical member 16 of the lower support unit 10a by welding or bolting in water.

  Thereafter, the supporting and supporting unit 10a is erected by the same procedure and is installed on the bracket 8 of the third stage as shown in FIG. 15 (a), and the above-mentioned joining is performed in the same manner. Finally, as shown in FIG. 15 (b), the truss support 1a is air-bonded to the upper end of the vertical member 16 of the uppermost support unit 10a, and the truss support 1a is supported in four steps at a position where it is supported. The eye bracket 8 is formed. As a result, a temporary shut-off structure 20a is formed in which the upper and lower four-stage truss support works 1a are annularly arranged along the inner circumference of the well with the steel pipe sheet pile 4.

  The work procedure before and after the installation of the shoring work is the same as that of the first embodiment, and in this embodiment, the same effect as that of the first embodiment can be obtained by using the shoring unit 10a. In addition, in the present embodiment, since the supporting and supporting units 10a, which are divided into small pieces on the plane, are joined and used on site, the individual supporting and supporting units 10a can be light in weight, and the load at the time of loading can be reduced. In addition, in this embodiment, the truss support 1 of the first embodiment is the support unit 10a having a size obtained by dividing the truss support 1 in a plane, but the size and the number of divisions are not limited to this, and the capability of the crane or the like used. Can be set according to.

[Fourth Embodiment]
16 and 17 are views for explaining the installation procedure of the support work in the fourth embodiment. Also in the fourth embodiment, as shown in FIG. 16 (a), a pair of supporting and supporting units 10a are grounded and joined on the pedestal 9 as in the third embodiment, and the first stage bracket 8 is attached. However, this bracket 8 is at a higher position than that of the third embodiment.

  Therefore, when the supporting unit 10a is hung like the third embodiment and installed on the first stage bracket 8 as shown in FIG. 16 (b), the vertical member 16 of the supporting unit 10a, etc. The upper end is above the surface of the water.

  After that, as shown in FIG. 16C, a pair of supporting and supporting units 10a are newly grounded and joined on the ship 9. In the present embodiment, at this time, the truss support 1a (another support) of the support structure unit 10a that has been set up in the air is welded to the upper end of the vertical member 16 of the lower support structure unit 10a by welding or bolts. Attach by attaching.

  Next, the bracket 8 is removed, and the bracket 8 is formed below the bracket 8 as shown in FIG. 16 (d). The supporting unit 10a is hung in the same manner as described above, and the bracket 8 is removed as shown in FIG. 17 (a). Install on 8. At this time, since the upper ends of the vertical members 16 and the like of the upper supporting unit 10a come to the surface of the water, the same procedure as described below is applied to the ground structure of the new supporting unit 10a and the vertical member 16 of the lower supporting unit 10a. Are joined and installed on the bracket 8. This state is shown in FIG.

  At this time, since the upper end portion of the vertical member 16 of the uppermost support member 10a is above the water, the truss support member 1a is bonded to the upper end portion of the vertical member 16 in the air as shown in FIG. 17 (c). At the same time, the bracket 8 is formed at a position to support the truss support 1a of the second to fourth steps. This also forms the temporary shut-off structure 20a in which the upper and lower truss support works 1a are annularly arranged along the inner circumference of the well by the steel pipe sheet pile 4.

  The work procedure before and after the installation of the shoring work is the same as that of the first embodiment, and in this embodiment, the same effect as that of the third embodiment can be obtained by using the shoring unit 10a. Further, in the present embodiment, since all the joining can be performed in the air, the work becomes easier as compared with the third embodiment.

[Fifth Embodiment]
18 and 19 are views for explaining the installation procedure of the supporting work in the fifth embodiment. In the fifth embodiment, as shown in FIG. 18 (a), the truss support work 1 a having the required number of steps (4 steps in the example in the figure) is vertically moved by using the truss structure including the vertical members 16 and the diagonal members 17. The supporting and supporting unit 10b connected to is used. The support unit 10b is assembled and manufactured in advance on the ground or on the water, and is carried to the site for use.

  In the present embodiment, the supporting and supporting unit 10b is hung by a crane (not shown) of a hoist ship or the like, and the steel pipe sheet pile 4 is placed at a predetermined position inside the well as shown in FIG. It is supported from above by suspending it with a wire or the like from a suspending device (not shown) provided at the top of the. Then, the other supporting and supporting unit 10b is suspended in the same manner, is arranged next to the supporting and supporting unit 10b, and is supported from above as described above, as shown in FIG. 19 (a).

  After that, the pair of supporting and supporting units 10b are joined in water by welding, bolts or the like to form a substantially square V-shaped annular flat surface similar to that of the first embodiment. Then, as shown in FIG. 19 (b), after draining the inside of the well pipe by the steel pipe sheet pile 4 and drying up, the bracket 8 is formed at a position for supporting the truss support 1a at each stage. As a result, a temporary shut-off structure 20b is formed in which the upper and lower four-stage truss support works 1a are annularly arranged along the inner circumference of the well by the steel pipe sheet pile 4.

  The work procedure before and after the installation of the supporting work is the same as that of the first embodiment, and in this embodiment, the same effect as that of the first embodiment can be obtained by using the supporting unit 10b.

  In addition, in the present embodiment, the truss support 1a is the support unit 10b in which the upper and lower four stages are connected, but the number of stages is not limited to this, and similarly to the above, it can be determined according to the capacity of the crane to be used. . Further, the plane of the truss support 1a is a half of the truss support 1 of the first embodiment, but the present invention is not limited to this, and a total of 4 divided into two vertically and two horizontally is used. By joining in water, a substantially square V-shaped annular plane similar to that of the first embodiment may be formed.

[Sixth Embodiment]
20 and 21 are views for explaining the installation procedure of the support work in the sixth embodiment. 6th Embodiment is an example which arranges the truss support 1 of 8 steps | paragraphs.

  That is, in the sixth embodiment, first, as shown in FIG. 20 (a), after forming the first stage bracket 8, the truss support work 1 is hung from a crane (not shown) such as a hoist ship, The truss support 1 of the first stage is installed on the bracket 8. In addition, a bracket receiving material 81 (see FIG. 2B) is previously attached to the formation positions of the remaining second to fourth stages of the bracket 8 described later.

  Next, as shown in FIG. 20 (b), the second stage truss support 1 is similarly hung by a crane or the like and installed on the first stage truss support 1.

  After that, as shown in FIG. 20C, the bracket 8 of the second step is formed in the same manner as in the first embodiment, and the truss structure including the vertical member 16 and the diagonal member 17 is provided below the truss support work 1. The supporting unit 10c is hung with a crane or the like. The support work unit 10c is assembled and manufactured in advance on the ground or on the water, and is carried to the site for use.

  When the truss support 1 of the support unit 10c is installed on the second stage bracket 8 as shown in FIG. 20D, the lower end of the vertical member 16 of the support unit 10c is the second stage truss support 1. It comes to a predetermined position above, and at this position, the second stage truss support 1 (another support) is joined and attached to the lower end of the vertical member 16.

  Next, on the truss support 1 (third stage truss support 1) of the support unit 10c, the fourth stage truss support 1 is hung with a crane or the like as shown in FIG. 21 (a). Install. In this way, the truss support 1 for four steps is installed.

  21 (b), the third stage and the fourth stage brackets 8 are formed and the four-stage truss support 1 is newly installed in the same procedure. As a result, a temporary shutoff structure 20c is formed in which the truss support works 1 having a total of eight stages are annularly arranged along the inner circumference of the well by the steel pipe sheet pile 4.

  The work procedure before and after the installation of the supporting work is the same as that of the first embodiment. In this embodiment, the same effect as that of the first embodiment can be obtained by using the supporting and supporting unit 10c and the like.

  In this embodiment, the truss support 1 is installed on the truss support 1. At this time, however, as shown in FIG. 22A, the guide plate 811 of the guide member 81 provided on the truss support 1 in the lower stage. Alternatively, the protruding members 82 provided on the upper truss support 1 may be guided to align the two truss supports 1. The tip of the projecting member 82 projects downward from the truss support 1 of the upper stage, and the guide plate 811 of the truss support 1 of the lower stage is arranged so as to match the shape of the tip of the projecting member 82.

  Further, in the present embodiment, the vertical member 16 of the supporting and supporting unit 10c is attached to the truss supporting work 1 in the lower stage, but in this case also, as shown in FIG. The vertical member 16 of the supporting and supporting unit 10c may be lowered along the member 91 for alignment. In the example of FIG. 22B, a box 92 having an upward opening is arranged in the truss support 1 and a guide member 91 is provided therein, and the support unit 10c is provided inside the box 92 along the guide member 91. After arranging the vertical member 16 of No. 3, the mortar 93 or the like is filled into the box 92 to fix the vertical member 16 to the truss support 1 of the lower stage.

  Alternatively, as shown in FIG. 22C, a receiving plate 93 is arranged on the truss support 1 and a guide member 91 is provided on the receiving plate 93, and the vertical member 16 is guided by the guide plate 911 of the guide member 91. Good. In this example, a screw 94 protrudes upward from the receiving plate 93, and the screw 94 is passed through a hole (not shown) in the bottom plate 161 provided at the bottom end of the vertical member 16 to tighten the nut 95. 16 is fixed to the truss support 1 at the lower stage.

  Further, in the example of FIG. 22D, guide members 91a and 91b are provided on the receiving plate 98 arranged on the truss support work 1. The guide members 91a and 91b are arranged on both sides of the vertical member 16 with the vertical member 16 interposed therebetween, and the vertical member 16 of the supporting and supporting unit 10c is guided along the guide plates 911 of the guide members 91a and 91b. Further, in this example, the pin 96 is arranged on the flange 162 provided at the bottom end of the vertical member 16, and the flange 162 is pressed from above to fix the vertical member 16 to the truss support 1 in the lower stage. Both ends of the pin 96 are pressed from above by pressing plates 97 provided on the guides 91b on both sides of the vertical member 16 (only the pressing plate 97 on the front side is shown in FIG. 22 (d)). When the material 16 is not fixed, it is stored in the notch 912 provided in the guide 91a (see reference numeral 96 'in the figure).

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and naturally, these also belong to the technical scope of the present invention. Understood.

1, 1a; Truss support 2; Ground 3; Water area 4, 5; Steel pipe sheet pile 4a; Support material receiving part 6; Guide frame 6a; Outer frame 6b; Inner frame 7; Support material 8, 8 ', 8a; Bracket 9 ; Barges 10, 10 ', 10a, 10b, 10c; support unit 11; vertical members 12; horizontal members 14, 17, 61; diagonal members 15; openings 16; vertical members 18; horizontal members 20, 20', 20a. , 20b, 20c; temporary shutoff structure 31; precast block 32; hook 33; filling material 34; bag body 71; paving stone layer 72; bottom concrete 73; top slab concrete 74; pier 81, 81a; bracket receiving material 82; bracket body 83; Hooking portion 84; Welding portion 100; Supporting work 101; Raising 102; Cutting beam 103; Firing 110; Intermediate pile

Claims (14)

A process of closing the water area by the closed area by the temporary cutoff body,
A step of installing a supporting structure inside the temporary cutoff body,
Equipped with,
The shoring is the central portion are arranged annularly along the inner periphery of the provisional deadline body has an opening, and have a truss structure in a plane,
A padding portion is provided between the support work and the temporary cutoff body,
The padding part is
A precast block arranged on the outer periphery of the supporting work,
A bag body provided on the front surface of the precast block for filling a filler,
Provisional deadline method characterized in that to have a. The temporary cut-off method according to claim 1, wherein after the support work is installed, the bag is filled with the filling material to inflate the bag so as to be in close contact with the shape of the temporary cut-off body. . The temporary deadline method according to claim 1 or 2, wherein the supporting work is installed in a plurality of upper and lower stages. The temporary shut-off method according to claim 3 , wherein at least two stages of the support work are vertically connected by a truss structure. The temporary shutoff method according to claim 4 , wherein a support unit in which at least two stages of the supportwork are connected in advance vertically by a truss structure is lowered and installed inside the temporary shutoff body. Install a truss structure with a truss structure above or below the truss in advance and install it inside the temporary shutoff body, and then attach another truss to the truss structure of the truss support unit. The temporary deadline method according to claim 4 , wherein   The bottom plate is constructed at the bottom of the excavation after underwater excavation of the ground inside the temporary cutoff body while leaving the guide frame when the temporary cutoff body is placed on the ground. The temporary deadline method according to claim 6. A partition is formed inside the temporary cutoff body,
8. The temporary shutoff method according to claim 1, wherein after excavating the ground inside the temporary shutoff body, a predetermined position of the partition wall is cut and an upper portion is removed. A temporary cutoff body that forms a closed area and closes the water area,
Support work installed inside the temporary cutoff body,
Have
The shoring is the central portion are arranged annularly along the inner periphery of the provisional deadline body has an opening, and have a truss structure in a plane,
A padding portion is provided between the support work and the temporary cutoff body,
The padding part is
A precast block arranged on the outer periphery of the supporting work,
A bag body provided on the front surface of the precast block,
Have
By filling material to the bag is filled, the provisional deadline structure the bag is characterized Rukoto not inflated so as to be in close contact with the shape of the provisional deadline body.   10. The temporary deadline structure according to claim 9, wherein the supporting work is installed in a plurality of upper and lower stages.   11. The temporary deadline structure according to claim 10, wherein at least two stages of the support work are connected vertically by a truss structure. A supporting structure used for a temporary cutoff structure in which a water area is closed by a closed area by a temporary cutoff body,
Plane has a central portion is an opening in the annular, and have a truss structure in a plane,
A precast block is arranged on the outer periphery of the support work,
Shoring, characterized in Rukoto bag is provided for filling the filling material in front of the precast block.   A support structure comprising a truss structure above or below the support structure according to claim 12.   14. The support unit according to claim 13, wherein at least two stages of the support work are vertically connected by a truss structure.

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