JP5101961B2 - Seismic strengthened steel plate installation method for columnar structures - Google Patents

Description

  The present invention relates to a method for installing a seismic reinforced steel plate for a columnar structure such as a viaduct or a bridge pier.

  As a seismic reinforcement method for underground structures such as viaduct columns and bridge piers where the frame is buried in the soil, excavation of the soil around the frame and construction of temporary earth retaining, installation of the reinforcing steel plate, the frame and the reinforcing steel plate There is known a method of filling the gaps with a filler. In this general construction method, the earth and sand around the frame are excavated and temporary earth retaining is required, so that much labor is required for the installation work of the reinforcing steel plate.

  In addition, in order to reduce excavation in the soil, a method of filling and filling the filler by excavating the sand between the closed reinforcing steel plate and the frame by sequentially connecting and press-fitting reinforcing steel plates having joints at the ends. Is also known. Specifically, as shown in FIGS. 20 and 21, the reinforcing steel plate 4 is sequentially press-fitted through the ground surface 3 around the pier housing 1 to the position of the footing 2 to be closed, and the closed reinforcing steel plate 4 and the pier housing 1 are closed. There is a method of filling the filler 5 after removing the earth and sand between the two.

  In the method shown in FIGS. 20 and 21, in order to reliably excavate the soil in the gap between the frame and the reinforcing steel plate after the press-fit installation of the reinforcing steel plate and to fill the filler, the reinforcing steel plate is spaced a certain distance from the frame. As shown in the figure, when there is an underground obstacle 6, as shown in the figure, the lower end of the reinforcing steel plate is hindered and cannot be press-fitted to a predetermined depth, and the installation position of the steel plate is not easily determined. Further, the earth and sand 7 remaining in the gap between the reinforcing steel plate and the pier frame is sandwiched between the reinforcing steel plate and the frame, and the excavation work becomes difficult.

The present invention is intended to solve the above-mentioned problems, and aims to eliminate obstacles by press-fitting a reinforced steel plate into an underground structure, to ensure the accuracy of steel plate installation, and to simplify sediment excavation. And
The present invention is a seismic reinforcement method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A bottom plate is formed at the lower end of the reinforcing steel plate, and a spacing member is formed to maintain the distance between the casing and the reinforcing steel plate across the lower end of the reinforcing steel plate and the bottom plate, and the bottom plate tip is brought close to or in contact with the casing. The reinforced steel sheet is press-fitted into the ground to eliminate obstacles between the frame and the reinforced steel sheet.
The present invention is characterized in that a plurality of the spacing members are formed.
Moreover, the present invention is characterized in that the front end portion of the bottom plate is inclined downward and obstacles are eliminated by press-fitting a reinforcing steel plate.
Further, the present invention relates to a seismic reinforcement method in which a reinforcing steel plate having a joint at an end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A spacing member that maintains the spacing between the casing and the reinforcing steel plate is formed at the lower end of the reinforcing steel plate so that the lower side is inclined downward toward the casing side, and the reinforcing steel plate is press-fitted into the ground.
The present invention is characterized in that a plurality of the spacing members are formed.
Further, the present invention relates to a seismic reinforcement method in which a reinforcing steel plate having a joint at an end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
The lower end portion of the reinforcing steel plate is cut obliquely, the reinforcing steel plate is press-fitted facing the housing, and obstacles are eliminated by the cut inclined portion.
Further, the present invention is characterized in that a bottom plate is formed along the cut inclined portion, and a reinforcing steel plate is press-fitted into the ground with the bottom plate tip approaching or contacting the housing.

  In the present invention, obstacles are eliminated by press-fitting a reinforced steel plate, so that the steel plate installation accuracy can be ensured and the sediment excavation can be simplified.

Embodiments of the present invention will be described below. In the following, pier reinforcement will be described as an example, but the present invention can be applied to any columnar structure such as a viaduct pillar.
FIG. 1 is a view for explaining an example in which a bottom plate is formed at the lower end of a reinforcing steel plate as a tip closing type.
The lower end of the reinforcing steel plate 10 having a joint at the end is bent, or the end of the bottom plate 20 formed toward the housing side by joining the plates obliquely to the lower end is brought into contact with the wall surface of the pier housing 1 (end closing) (Fig. 1 (a)), or by bending or obliquely joining the plates and forming them toward the housing, the tip of the bottom plate 21 with the tip bent upward is brought into contact with the wall surface of the pier housing 1 ( The tip is closed (FIG. 1B). One or more spacing members 40 are attached to the lower end portion of the reinforcing steel plate 10 and the bottom plates 20 and 21 by bonding in order to maintain the spacing between the pier frame. When the reinforcing steel plate 10 is press-fitted along the pier housing 1, earth pressure is applied to the tip of the reinforcing steel plate in the direction of arrow A, and the spacing member 40 is pressed against the housing wall surface. In response to the reaction force shown in Fig. 1, the reinforced steel plate does not approach the housing side against the earth pressure. What is necessary is just to make it the thickness which can hold | maintain the space | interval required for construction as the space | interval material 40 between a reinforcement steel plate and a housing. Thus, when the reinforcing steel plate 10 is press-fitted while the spacing member 40 and the tips of the bottom plates 20 and 21 are in contact with the housing surface, even if there is an obstacle 6, the bottom plates 20 and 21 are opposite to the reinforcing steel plate housing ( To the rear side). Therefore, steel plate installation accuracy can be ensured, and earth and sand in the gap between the reinforcing steel plate and the frame can be almost eliminated to the back side of the reinforcing steel plate, thereby simplifying excavation work. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed. Thus, by making a bottom plate into a front-end | tip obstruction type, the inflow of earth and sand etc. is prevented and the effect which makes the earth and sand excavation after reinforcement steel plate winding up acquired.

  In the above description, the spacing material is provided at the lower end of the reinforcing steel plate. However, if the strength of the reinforcing steel plate is sufficient, the bottom plate itself functions as the spacing material even if the spacing material is omitted, and the bottom plate reinforces earth and sand. It can be eliminated to the opposite side (back side) of the steel plate. In addition, as shown in the figure, the bottom plate can be increased in the function of removing soil and the like by tilting the tip portion downward toward the housing side. Moreover, although the example of FIG. 1 is a tip closing type, when it is not necessary to be a tip closing type, the bottom plates 20 and 21 may not be provided, and the spacing member 40 itself functions as a bottom plate. Obstacles, earth and sand, etc. can be removed to the opposite side (rear side) of the reinforcing steel plate by the spacing material, and in this case, the press-fit resistance can be further reduced.

FIG. 2 is a view for explaining an example in which a bottom plate is formed at the lower end portion of the steel plate as a tip non-blocking type.
In this example, the diagonal bottom plate 22 is joined to the lower end portion of the reinforcing steel plate 10 having a joint at the end so as to extend from the opposite side (back side) of the reinforcing steel plate toward the housing side (FIG. 2 (a)). Alternatively, the bottom end of the reinforcing steel plate 10 having a joint at the end is bent, or the bottom plate 23 is formed obliquely by joining the plates obliquely to the bottom (FIG. 2 (b)). The spacing members 41 and 42 are joined to the lower end of the steel plate and the bottom plate so as to protrude from the tips of the bottom plates 22 and 23 toward the housing. When such a reinforcing steel plate 10 is press-fitted along the pier housing 1, earth pressure is applied to the bottom plate in the direction of arrow A, and the spacing members 41 and 42 are pressed against the housing wall surface. By receiving the reaction force indicated by the arrow B from the housing, it resists the earth pressure and the reinforced steel plate does not approach the housing side. 2 (a) is subjected to earth pressure toward the steel plate on the side opposite to the steel plate housing, but is not balanced by the earth pressure received on the steel plate housing side, and the rotational moment does not act. The portion of the bottom plate 22 opposite to the casing of the reinforcing steel plate (back side) contributes to the elimination of obstacles on the back side, and can easily press-fit the reinforcing steel plate.

  As the spacing members 41 and 42, as in the case of FIG. 1, the spacing members 41 and 42 have a thickness that can maintain the spacing required for construction. Thus, when the reinforcing steel plate 10 is press-fitted while the spacing members 41 and 42 are brought into contact with the housing surface, even if there is an obstacle 6, the force to move into the soil by the bottom plates 22 and 23 can be eliminated. Reinforced steel plate installation accuracy can be ensured. Moreover, since the tip of the bottom plate is separated from the wall surface of the frame, earth and sand flow into the gap between the reinforcing steel plate and the frame, but excavation work is easy because the diameter of gravel such as earth and sand is small. In addition, it is possible to maintain the strength of the bottom plate by installing a plurality of spacing members, and it is possible to further reduce the diameter of gravel such as earth and sand flowing in. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed. By making the bottom plate non-blocking in this way, the effect of reducing earth pressure (reducing resistance during installation) can be obtained.

  In the above description, the spacing material is provided at the lower end of the reinforcing steel plate. However, in this example as well, the spacing material may be omitted if the strength of the reinforcing steel plate is sufficient. It can be eliminated to the opposite side (back side). Further, the bottom plates 22 and 23 may not be provided, and the spacing members 41 and 42 themselves function as a bottom plate, and obstacles and earth and sand are excluded to the opposite side (rear side) of the reinforcing steel plate by the spacing members. In this case, the press-fit resistance can be further reduced.

FIG. 3 is a view for explaining an example in which a bottom plate is formed at the lower end portion of the reinforcing steel plate as a tip closing type, and an ejection nozzle is provided on the side portion on the reinforcing steel plate joint side. FIG. b) and FIG.3 (c) are front side perspective views. In this example, high-pressure water (or high-pressure air) is ejected to the side portion on the reinforcing steel plate joint side having the configuration shown in FIG.
In FIG. 3A, the lower end of the steel plate 10 that reinforces the pier housing 1 is bent, or the bottom plate 20 formed by joining the plates obliquely at the lower end and facing the housing side is used as the wall surface of the pier housing 1. One or more spacing members 40 are attached to the lower end portion of the reinforcing steel plate 10 and the bottom plate 20 by bonding in order to maintain the spacing between the pier frame and as described above. When the reinforcing steel plate 10 is press-fitted while the spacing member 40 and the tip of the bottom plate 20 are in contact with the housing surface, even if there is an obstacle 6, the bottom plate 20 moves to the opposite side (back side) of the reinforcing steel plate. Can be eliminated. Furthermore, press-fitting can be easily performed by jetting high-pressure water or high-pressure air from the jet nozzle 15 to fluidize and remove earth and sand. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed.

  The jet nozzle may be either a joint part or a steel sheet pile. As shown in FIG. 3B, the jet nozzle 15 is provided with a jet nozzle pipe 15 on the side of the reinforcing steel plate 10 to reduce the press-fitting resistance. Alternatively, as shown in FIG. 3C, the injection resistance may be reduced by installing a pipe for the ejection nozzle in the joint 11 at the end of the steel plate. Further, in the above example, the ejection nozzle is installed in the case of the tip closed type shown in FIG. 1A, but may be installed in the case of the tip non-closed type shown in FIG. Needless to say.

FIG. 4 is a view for explaining an example in which the lower end portion of the steel plate is cut obliquely (one-sided) to form a spacing member and a bottom plate, FIG. 4 (a) is a sectional view, and FIG. 4 (b) is a front view. .
In this example, the front end of the reinforcing steel plate 10 having a joint at the end is cut obliquely (one-sided), and the bottom plate 24 is joined along the cut lower side, and the both sides of the bottom plate are connected to the side on the reinforcing steel plate joint side. The spacing members 43 and 44 are joined along. When such a reinforcing steel plate is press-fitted and the bottom plate 24 hits the obstacle 6, the bottom plate 24 is slanted so that the obstacle is moved laterally along the housing surface (FIG. 4 (b)) and removed. As a result, the installation accuracy of the reinforced steel plate can be ensured. If the bottom plate 24 and the spacing members 43, 44 have the same protruding height from the reinforcing steel plate 10 and are of a closed end type, the earth and sand in the gap between the reinforcing steel plate and the frame can be almost eliminated, so excavation work of earth and sand etc. However, it may not be a tip closing type. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed. Note that, by cutting (cutting) the front end of the reinforcing steel plate 10 obliquely, it is possible to reduce the press-fitting resistance and improve the propulsion property during the press-fitting of the steel plate. Of course, the bottom plate or the like may not be provided at the tip which is cut obliquely, in which case the press-fit resistance can be further reduced, and the spacing member may be omitted and only the bottom plate 24 may be omitted. In addition, it is possible to sufficiently remove earth and sand by press-fitting a reinforced steel plate.

FIG. 5 is a diagram for explaining another example in which the lower end of the steel plate is cut obliquely (one-sided), FIG. 5 (a) is a front view, and FIG. 5 (b) is a side view.
In this example, the lower end of the reinforcing steel plate 10 having a joint at the end is cut obliquely (one-sided), the bottom plate 25 is joined along the cut lower side, and the two spacing members 45 and 46 are connected to the lower end of the steel plate. Join the steel plate along the hypotenuse. In this example, the protruding height of the spacing members 45 and 46 from the reinforcing steel plate to the housing side is set higher than the protruding height of the bottom plate from the reinforcing steel plate to the housing side to make the tip non-blocking type, but the spacing material and the bottom plate are reinforced. The protruding height from the steel plate to the housing side may be the same and the tip closed type may be used. Of course, three or more spacing members may be provided. Thus, by cutting the lower end of the reinforcing steel plate obliquely, the press-fitting resistance can be reduced and the propulsive property during the press-fitting of the steel plate can be improved. Further, by using a plurality of spacing members, the straightness at the time of press-fitting a steel plate is improved, and the rigidity of the reinforced steel plate is increased, so that press-fitting at a high pressure can be performed. When this reinforcing steel plate is press-fitted, the obstruction is moved laterally and eliminated because the bottom plate 25 is inclined, and as a result, the installation accuracy of the reinforcing steel plate can be ensured. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed.

  In this example as well, the spacing members 45 and 46 may be omitted and only the bottom plate 25 may be used, and earth and sand can be removed laterally along the frame surface by the bottom plate 25 by press-fitting the reinforcing steel plate. Further, the bottom plate 25 may be omitted and only the spacing members 45 and 46 may be used. In that case, the press-fitting resistance can be further reduced.

6A and 6B are diagrams for explaining an example in which the lower end portion of the steel plate is cut obliquely (both sides), FIG. 6A is a front view, and FIG. 6B is a side view.
In this example, the lower end portion of the reinforcing steel plate 10 having a joint is cut obliquely (both sides) from both side portions toward the center to form a triangular shape, and the spacing members 47 and 48 are joined along the periphery thereof. In addition, as shown in the figure, the spacing members 47 and 48 may be slightly extended upward along both sides of the reinforcing steel plate. In this example, the bottom plate is not particularly provided, but the spacing members 47 and 48 also have the function of the bottom plate. By making the lower end of the reinforcing steel plate a triangular shape, the propulsive performance at the time of press-in of the reinforcing steel plate can be improved, and by using a plurality of spacing members, the straightness at the time of press-in is improved and the rigidity of the steel plate is also increased. This makes it possible to press-fit reinforced steel sheets. Moreover, since it becomes a front-end | tip obstruction | occlusion type | mold, the inflow earth and sand after a reinforced steel plate press injection can be reduced.

  4 to 6, as described in FIG. 3, the ejection nozzle is provided in the joint portion of the reinforcing steel plate or the inside of the reinforcing steel plate to eject high-pressure water or high-pressure air to remove earth and sand. The press-fitting may be facilitated by fluidizing and eliminating.

  Next, an example of the shape of the bottom plate and the spacing member steel plate that eliminates obstacles during the press-fitting of the steel plate will be described with reference to FIGS.

7A and 7B are diagrams for explaining the basic shapes of the bottom plate and the spacing member, in which FIG. 7A is a perspective view and FIG. 7B is a side view.
At the lower end of the reinforcing steel plate 10 having the joint 11 at the end, a slant bottom plate 30 is formed with the tip inclined downward toward the housing side, and the plate shape extends across the reinforcing steel plate 10 and the slant bottom plate 30. The spacing member 50 is joined. The protruding height of the inclined bottom plate 30 and the spacing member 50 from the reinforcing steel plate may be the same or different. Here, the number of spacing members 50 is one, but a plurality of spacing members may be used. Further, the bottom plate 30 may be omitted and only the spacing member 50 may be used. In this case, the press-fit resistance can be further reduced. Furthermore, the bottom plate may be omitted, and a plurality of spacing members may be provided.In this case, if the spacing between the spacing members is narrowed, the particle size of the obstacle remaining between the housing and the reinforcing steel plate can be reduced. There is a reduction in the excavation work after that, and obstacles larger than the pitch interval of the spacing material can be eliminated at the lower end of the spacing material during press-fitting of the reinforcing steel plate, and the particle size of the remaining earth and sand is controlled. Can do. Of course, as described above, the spacing member 50 may be omitted if the strength of the reinforcing steel plate and the bottom plate is sufficient.

FIG. 8 is a diagram for explaining an example of the cross-sectional shape of the bottom plate.
FIG. 8A shows a case where the connecting portion with the lower end of the reinforcing steel plate is curved and the tip is linear, and FIG. 8B shows that the connecting portion with the lower end of the reinforcing steel plate is linear and the tip is on the upper side. In the case of the bent shape, FIG. 8C shows a shape in which the connecting portion with the lower end of the reinforcing steel plate is a curved shape and the tip is bent upward in a curved shape. The bottom plate has a function of eliminating obstacles and reducing inflow earth and sand after the press-fitting of the reinforcing steel plate, and it is desirable that the press-fitting resistance is small. The above-mentioned various shapes are selected in consideration of these factors.

FIG. 9 is a diagram showing examples of various shapes of the bottom plate viewed from the front side.
FIG. 9A shows the case of a flat and rectangular shape, and FIG. 9B shows the case of a flat and triangular or trapezoidal shape, but these corners may be further processed into a curved shape. Moreover, in order to improve steel plate press-fit property, as shown in FIG.9 (c), it is good also as a solid pyramid shape, such as a triangular pyramid, by sharpening a front-end | tip. Also in this case, the tip may be curved.

FIG. 10 is a diagram illustrating examples of various shapes of the spacing member.
Here, the case of a linear oblique bottom plate is illustrated, but the bottom plate of various shapes shown in FIG. 8 may be used.
10 (a) to 10 (d) show a case of a closed end type in which the protruding height of the spacing member and the bottom plate from the reinforcing steel plate is the same, and FIG. 10 (a) shows the joining of the spacing member to the reinforcing steel plate. Fig. 10 (b) shows the joining of the spacing material across the reinforcing steel plate and the bottom plate, Fig. 10 (c) shows the joining of the spacing material to the bottom plate, Fig. 10 (d) shows the joining of one spacing material to the reinforcing steel plate, etc. This is an example in which the spacing material is joined to the bottom plate. FIG. 10 (e) shows a case of a tip non-blocking type in which the protruding height of the spacing member from the steel plate is larger than the protruding height of the bottom plate from the steel plate, and is an example of joining across the steel plate and the bottom plate. . Of course, even in the case of the tip non-blocking type, the spacing material may be joined to the steel plate, the spacing material may be joined to the bottom plate, one spacing material may be joined to the steel plate, and the other spacing material may be joined to the bottom plate.

The basic shapes of the bottom plate and the spacing member are as shown in FIG. 7, but examples of the bottom plate and the spacing member designed to ensure the installation accuracy of the reinforcing steel plate and facilitate and simplify the excavation are shown in FIGS. explain.
FIG. 11 is a diagram for explaining an example in which the installation accuracy of the reinforcing steel plate is mainly ensured.
FIG. 11A shows an example in which a plurality of spacing members are provided. Here, two spacing members 51 and 52 are joined to the reinforcing steel plate 10 and the bottom plate 30, and a plurality of spacing members are used to form the tip of the bottom plate. Rigidity increases, and it contacts with a housing | casing with two space | intervals at two or more places, this becomes a guide at the time of press-fitting a reinforcing steel plate, the straightness of press-fitting increases, and the installation accuracy of the reinforcing steel plate can be secured.
FIG. 11B shows an example in which a plurality of spacing members are provided and a bottom plate is cut. Here, two spacing members 51 and 52 are joined to a reinforcing steel plate and a bottom plate, and a bottom plate 31 is used which is cut between the spacing members 51 and 52. By making the cut in the bottom plate, it is possible to reduce the press-fitting resistance and secure the installation accuracy of the steel plate.

FIG. 12 is a diagram showing an example in which shape steel is used as a bottom plate and a spacing member, and installation accuracy is mainly secured.
FIG. 12 (a) shows an example in which the rising surfaces of each pair of equilateral chevron steels in a pair are brought close to each other and joined to the lower end of the steel plate, and FIG. 12 (b) shows each equilateral chevron steel in a pair. This is an example in which the bottom surfaces of the steel plates are closely opposed to each other and joined to the lower end of the steel plate.
FIG. 12C is an example in which channel steel is joined to the lower end of the steel plate, and the functions of the spacing member and the bottom plate are similarly provided.
FIG. 12D shows an example in which H-shaped steel is joined to a steel plate and a bottom plate.
In either case, the rigidity at the tip of the reinforcing steel plate is increased and the straightness of press-fitting is increased, so that the installation accuracy of the reinforcing steel plate is ensured and press-fitting at a high pressure is possible.

FIG. 13 is a diagram mainly showing an example of reducing the amount of earth and sand excavation between the frame and the reinforcing steel plate.
FIG. 13A is an example in which the width of the bottom plate 32 is made wider than the width of the reinforcing steel plate 10 and the spacing members 51 and 52 are respectively joined to both side portions on the joint side of the reinforcing steel plate. The amount of earth excavation after press-fitting can be reduced.
In FIG. 13B, the spacing members 51 and 52 are arranged on both side portions of the bottom plate 33 and the both side portions of the bottom plate are closed, so that inflow soil and the like are reduced, and the amount of sediment excavation after press-fitting can be reduced.
FIG. 13C shows a trapezoidal shape in which the tip of the bottom plate 34 is narrowed, plate-like spacing members 53 and 54 are arranged along the left and right sides of the bottom plate, and are closed by the bottom plate, the spacing material, and the reinforcing steel plate. Inflow soil is reduced, and the amount of soil excavation after press-fitting of reinforcing steel plate can be reduced.

FIG. 14 is a diagram for explaining an example in which a diamond-shaped member is formed at the lower end of the steel plate. FIG. 14 (a) is a plan view, FIG. 14 (b) is a perspective view, FIG. 14 (c) is a front view, and FIG. d) is a side view.
This example shows an example in which a diamond-shaped member 60 having a predetermined thickness is joined to a lower end portion of a steel plate so that the tip thereof is directed upward and downward. The diamond-shaped member 60 functions as a spacing member that maintains the spacing with the casing surface, and also removes earth and sand at the tip of the reinforcing steel plate when it is press-fitted, so that it also has the function of the bottom plate in each of the above examples. Furthermore, since the point of the diamond-shaped member is directed downward, the propulsive property during press-fit is improved, and the point of the diamond-shaped member is also directed upward, so that it is easy to pull out when it is necessary to pull out. It is. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 and the joint of the adjacent steel plate with such a structure, press-fitting, removing earth and sand between the closed reinforcing steel plate and the pier frame, and then filling with concrete etc. To do.

15 is a view showing another example in which a diamond-shaped member is formed at the lower end of the steel plate, FIG. 15 (a) is a plan view, FIG. 15 (b) is a perspective view, FIG. 15 (c) is a front view, FIG. (D) is a side view.
In this example, with respect to the example of FIG. 14, the diamond-shaped member 61 with the center portion facing the housing of the diamond-shaped member raised is joined so that the pointed ends are directed upward and downward, and attached to the lower end of the steel plate, 14 is the same as the case of FIG. 14 except that the press-fit resistance is reduced by reducing the contact area between the diamond-shaped member 61 and the housing.

16A and 16B are diagrams for explaining an example in which a spacing member and an ejection nozzle are combined. FIG. 16A is a plan view, FIG. 16B is a perspective view, FIG. 16C is a front view, and FIG. ) Is a side view.
In this example, two plate-like spacing members 70 are attached to the lower end of a reinforcing steel plate having a joint at the end, the tip is inclined downward with the lower side of the plate-like spacing material facing the housing, and the tip is It is sharpened at an acute angle. Further, two oblique nozzles 71 are provided on the inner surfaces of the plate-like interval member 70 facing each other, and jet high pressure water or high pressure air downward and to the opposite side of the housing. The position where the oblique nozzle 71 is provided may be other than the inner surface side of the plate-like interval member, and the number of installation is arbitrary. In this way, by obstructing the lower side of the plate-shaped interval member downward toward the tip and sharpening the tip, obstructions and the like are removed to the opposite side of the housing, and further, the slant nozzle 71 is lowered and opposite to the housing. By ejecting high-pressure water or high-pressure air toward the side, the removal of obstacles and the like on the side opposite to the housing is further promoted. In addition, since there is no bottom plate at the lower end portion of the reinforcing steel plate, the press-fitting resistance is small, and the drawing when the drawing needs to be performed is easy. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

  17A and 17B are diagrams for explaining another example in which a spacing member and a jet nozzle are combined. FIG. 17A is a plan view, FIG. 17B is a perspective view, FIG. 17C is a front view, and FIG. (D) is a side view. This example is a lower end portion of a reinforcing steel plate having a joint, and two plate-like interval members 70 similar to those in FIG. 16 are attached to the surface facing the case, and the lower end of the plate-like interval member is directed to the case. The plate 75 with a raised central part is attached to the lower end of the surface (rear surface) opposite to the frame of the reinforcing steel plate, and the surface of the plate is inclined. A nozzle 76 that ejects high-pressure water or high-pressure air from above to below is provided. The plate 75 is raised at an angle from above and then heads downward from the steel plate. The high-pressure water or high-pressure air ejected along this surface interferes with the lift effect due to the angled plate surface. It works effectively on the exclusion of things. As described above, the plate-like spacing member 70 has its lower side inclined downward toward the tip and sharpens the tip, thereby removing obstacles and the like on the side opposite to the casing. And on the opposite side to the housing, high-pressure water or high-pressure air is jetted downward along the surface of the plate 75 with the central portion raised, so that the removal of obstacles and the like to the opposite side of the housing is further promoted. Will be. Further, as in the case of the example of FIG. 16, an oblique nozzle may be arranged on the inner surface side of the plate-like interval member 70 so that obstacles and the like can be effectively removed. In addition, since there is no bottom plate at the lower end of the steel plate, the press-fitting resistance is small, and the drawing is easy when the drawing needs to be performed. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

18A and 18B are diagrams for explaining an example in which plate-like members are provided on both surfaces of a reinforcing steel plate. FIG. 18A is a plan view, FIG. 18B is a perspective view, FIG. 18C is a front view, and FIG. (D) is a side view.
In this example, plate-like members 80 and 81 having lower sides inclined upward from the lower end of the reinforcing steel plate by attaching (cutting) the tip to the lower ends of both sides of the reinforcing steel plate having a joint at the end are respectively attached to the casing. The plate-like member 80 attached to the side surface is caused to function as a spacing member. By press-fitting the reinforcing steel plate, obstacles on the housing side are eliminated at the inclined side of the plate-like member 80, and obstacles on the opposite side (back side) from the housing are eliminated at the inclined side of the plate-like member 81. Further, the plate-like member 81 functions as rigidity reinforcement at the time of press-fitting a reinforced steel plate. Further, a plurality of plate-like members may be provided on each surface, and by setting the pitch interval of the plate-like members as appropriate, the particle size of the remaining earth and sand is controlled as described in the case of FIG. be able to. And since there is no bottom plate in the lower end part of a reinforced steel plate, there is little press-fitting resistance and it is also easy to pull out when it is necessary to pull out. In the above description, the lower end portion of the reinforcing steel plate is cut off. However, it may be cut diagonally (both sides) from both sides toward the center to form a triangular shape, or it may be flat without being cut. Needless to say. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

FIG. 19 is a diagram illustrating an example in which a plurality of plate-like interval members are provided at the lower end of the steel plate.
In this example, a plurality of plate-like interval members are attached to the lower end portion of the reinforcing steel plate 10 having a joint at the end portion, and the lower end of the plate-like interval member is inclined downward toward the tip end so that the tip end portion is angled. It is also sharp.
FIG. 19A shows the plate-like spacing member 85 as a rectangular plate, with its tip sharpened, and FIG. 19B shows the tip of the plate-like spacing member 90 on the housing side as a curved line. The crossing tip is pointed. In either case, obstructions and the like are removed to the opposite side of the housing at the inclined side of the tip. Also in this example, since there is no bottom plate at the lower end of the steel plate, the press-fitting resistance is small, and the drawing when it is necessary to pull out is easy. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

  14, 15, 18, and 19, the ejection nozzle is provided in the joint portion of the reinforcing steel plate or in the reinforcing steel plate to eject high-pressure water or high-pressure air to remove earth and sand. The press-fitting may be facilitated by fluidizing and eliminating.

It is a figure explaining the example which formed the baseplate in the steel plate lower end part as a front-end | tip obstruction type. It is a figure explaining the example which formed the baseplate in the steel plate lower end part as a tip non-occlusion type. It is a figure explaining the example which formed the bottom plate in the steel plate lower end part as a front end obstruction type, and provided the injection nozzle in the steel plate joint side part. It is explanatory drawing of the example which cut the lower end part of the steel plate diagonally and formed the space | interval material and the baseplate. It is a figure explaining the example which cut off the lower end part of the steel plate diagonally. It is a figure explaining the example which cut both ends of the steel plate diagonally. It is a figure explaining the baseplate and the basic shape of a space | interval material. It is a figure explaining the example of the cross-sectional shape of a baseplate. It is a figure which shows the example of various front shapes of a baseplate. It is a figure which shows the example of the various shapes of a space | interval material. It is a figure which shows the example of the baseplate and the space | interval material which ensured the steel plate installation precision. It is a figure which shows the example which uses a shape steel as a baseplate or a space | interval material. It is a figure which shows the example which reduces the earth and sand excavation between a frame and a steel plate. It is a figure explaining the example which formed the diamond-shaped member in the steel plate lower end part. It is a figure explaining the other example which formed the diamond-shaped member in the steel plate lower end part. It is a figure explaining the example which combined the space | interval material and the ejection nozzle. It is a figure explaining the other example which combined the space | interval material and the ejection nozzle. It is a figure explaining the example which provided the plate-shaped member on both surfaces of the reinforcing steel plate. It is a figure explaining the example which provided the some spacing material in the steel plate lower end part. It is a figure explaining the whole conventional reinforcement steel plate press-fit method. It is a figure explaining the detail of the conventional reinforcement steel plate press-fitting method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pier pier frame, 2 ... Footing, 3 ... Ground surface, 4 ... Reinforced steel plate, 5 ... Ground surface, 6 ... Obstacle, 10 ... Reinforced steel plate, 11 ... Joint, 15 ... Jet nozzle, 20-25, 30-34 ... bottom plate, 40 to 48, 50 to 54 ... spacing member, 60, 61 ... diamond-shaped member, 70, 85, 90 ... plate spacing member, 71, 76 ... nozzle, 75 ... plate, 80, 81 ... plate member .

Claims (7)

In the seismic strengthening method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A bottom plate is formed at the lower end of the reinforcing steel plate, and a spacing member is formed to maintain the distance between the casing and the reinforcing steel plate across the lower end of the reinforcing steel plate and the bottom plate, and the bottom plate tip is brought close to or in contact with the casing. A method of installing a seismic reinforced steel plate for a columnar structure, wherein the reinforced steel plate is pressed into the ground to eliminate obstacles between the frame and the reinforced steel plate. The earthquake-resistant reinforced steel plate installation method according to claim 1, wherein a plurality of the spacing members are formed. The method for installing a seismic reinforced steel plate according to claim 1 or 2, wherein the obstruction is removed by inclining the tip of the bottom plate downward and press-fitting the reinforced steel plate. In the seismic strengthening method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A columnar material characterized in that a spacing member for maintaining a space between the housing and the reinforcing steel plate is formed at the lower end of the reinforcing steel plate so that the lower side thereof is inclined downward toward the housing side, and the reinforcing steel plate is press-fitted into the ground. How to install seismic reinforced steel sheets for structures. The method for installing a seismic reinforced steel plate for a columnar structure according to claim 4, wherein a plurality of the spacing members are formed. In the seismic strengthening method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A method of installing a seismic reinforced steel plate for a columnar structure, wherein the lower end portion of the reinforced steel plate is cut obliquely, the reinforcing steel plate is press-fitted against the housing, and obstacles are eliminated by the cut inclined portion. 7. The method of installing a seismic reinforced steel plate according to claim 6, wherein a bottom plate is formed along the cut inclined portion, and the reinforcing steel plate is press-fitted into the ground with the bottom plate tip approaching or contacting the housing.

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