JP6664153B2 - Steel pipe sheet pile connection structure - Google Patents

Description

  The present invention relates to a method in which mechanical joints provided at connection ends of steel pipes are fitted to each other and connected in the axial direction of the steel pipes, and sheet steel joints provided on side surfaces of the steel pipes and the mechanical joints are fitted together. And a steel pipe sheet pile connecting structure that can be connected in the radial direction of the steel pipe.

  Conventionally, a steel pipe sheet pile connection structure has a configuration in which a sheet pile joint is provided on a side surface of the steel pipe along an axial direction of the steel pipe. The mechanical joints provided at the connection end portions are fitted together and the sheet pile joints are welded or bonded together, and the steel pipe sheet piles are connected in the radial direction by a pair of sheet piles facing each other in the radial direction of the steel pipe. Water was stopped by fitting the joints together (for example, see Patent Document 1).

JP-A-2000-234333 (paragraph number [0021], FIG. 5)

In the above-described steel pipe sheet pile connection structure, with respect to the connection of the steel pipe sheet piles in the axial direction, the connection between the steel pipes can be quickly performed because of the configuration in which the mechanical joints are fitted, but the connection between the sheet pile joints is performed by welding or bonding. As a result, there is a problem that it takes a long time to connect as a whole and the installation efficiency of the steel pipe sheet piles is low.
Therefore, it is conceivable that sheet pile joints do not use time-consuming welding or bonding.
However, since the mechanical joint is usually provided with a fitting allowance of about several mm, even if the mechanical joints are fitted, a gap may be formed between the opposed end faces of the sheet pile joints. There was a risk that water could not be stopped.

  Therefore, an object of the present invention is to solve the above-mentioned problems, and in the procedure of connecting mechanical joints, the sheet pile joints can be connected in a watertight state, and the connecting operation of steel pipe sheet piles can be performed easily and quickly. An object of the present invention is to provide a steel pipe sheet pile connection structure that can be implemented.

The first characteristic configuration of the present invention is that the mechanical joints provided at the connection end portions of the steel pipes are fitted together and connected in the axial direction of the steel pipes, and the sheet pile provided on the side surfaces of the steel pipes and the mechanical joints. A steel pipe sheet pile connection structure capable of connecting joints to each other and connecting them in the radial direction of the steel pipe, wherein the sheet pile joint has a cross-sectional shape in the axial direction of the mechanical joint, and a part of a circle. The steel material is formed of a cut-out C-shaped steel material, and the steel material is located at a position where the cut-out portion is not located on a line connecting the axis of the steel material and the axis of the mechanical joint. The uncut portion is attached to at least the steel pipe, and the sheet pile joint is a space defined by another sheet pile joint to be fitted with each other, and the inner surface of one sheet pile joint and the other sheet pile joint. Empty bounded by the outer surface of the joint Inside, and grout material is configured to be able to be filled in all of the space defined by the inner surfaces of the two sheet pile joints, and at least one of the pair of sheet pile joints facing the axial direction of the steel pipe. the end surface, the part of the mechanical joint side of the proximal region, or, from said mechanical joint is filled in a space defined in between the outer surface of the inner surface of the one sheet pile joint between the other sheet pile joint Any one of the regions leading to the grout material, a space defined by the inner surface of the one sheet pile joint and the outer surface of the other sheet pile joint, and a space defined by the inner surfaces of the two sheet pile joints. A seal material is provided on a part of the region sandwiched between the two sheet pile joints and a space defined by an inner surface of the one sheet pile joint and an outer surface of the other sheet pile joint. one region sandwiched by the space which is The sealing material provided is in place which is provided in the line connecting the axis of the mechanical joint to the axis of the steel.

According to the first characteristic configuration of the present invention, sheet pile joints are filled with a grout material filled in a fitting space defined by sheet pile joints that are radially opposed to each other and that are fitted to each other, Of the pair of sheet pile joints facing each other in the axial direction, the end face of at least one of the sheet pile joints is provided at the base end region on the mechanical joint side and at least in the region from the steel pipe to the grout material or in the region sandwiched by the grout material. Water can be stopped by the provided sealing material. The term “water stoppage” refers to suppressing passage of water between one side and the other side partitioned by a steel sheet pile.
In addition, a non-shrink mortar material is suitably used for the grout material.
Further, in the connection work between steel pipe sheet piles, the steel pipe sheet piles can be connected by a simple operation of merely connecting the mechanical joints in a state where the sealing material is located between a pair of sheet pile joints facing each other in the axial direction of the steel pipe. You can connect them.
That is, in the procedure for connecting the mechanical joints, the sheet pile joints can be connected in a watertight state, and the connecting operation of the steel pipe sheet piles can be performed easily and quickly. Moreover, since no welding or bonding is used, the installation efficiency can be improved.

  A second characteristic configuration of the present invention is a state in which an end face of at least one of the pair of sheet pile joints facing the axial direction of the steel pipe is opened toward an end face of the other sheet pile joint. A groove for disposing the sealing material is formed, the sealing material is formed of an elastic body, and a height dimension of the sealing material is a groove bottom surface of the groove and an end surface of the other sheet pile joint. Is formed so as to be larger than the separation dimension.

  According to the second characteristic configuration of the present invention, when the mechanical joints are connected to each other, the joints are elastically deformed by receiving a compressive force in the height direction and water can be stopped at the connection end.

  A third characteristic configuration of the present invention resides in that the sealing material has water expandability.

  According to the third characteristic configuration of the present invention, when the seal material comes into contact with water, when the mechanical joints are connected to each other, they expand from a state of being elastically deformed by receiving a compressive force in the height direction and expanding in the axial direction. It is possible to reliably fill the gap between the facing end faces of the pair of sheet pile joints facing each other to stop water.

A fourth characteristic configuration of the present invention is that, among the seal material, a seal material provided in a part of a base end region on the mechanical joint side or the mechanical joint, the inner surface of the one sheet pile joint and the other. The seal material provided in a part of the region up to the grout material filled in the space defined by the outer surface of the sheet pile joint and the mechanical joint and the seal member provided in a state where the connection operation is completed Closely attached to the grout material and provided in a part of a region sandwiched between a space defined by the inner surface of the one sheet pile joint and the outer surface of the other sheet pile joint and a space defined by the inner surfaces of both sheet pile joints. The sealing material thus obtained is in a state in which the two grout members sandwiching the sealing material are in close contact with each other when the connecting operation is completed.

  According to the fourth characteristic configuration of the present invention, since the seal material is in close contact with the mechanical joint and the grout material or the grout material and the grout material, the gap between the opposing end faces of the sheet pile joints where there is no grout material is provided. Can stop water.

Perspective view showing steel pipe sheet pile Sectional view of the main part showing the state of disposition of sealing material on sheet pile joint It is sectional drawing of the principal part of the sealing material provided in the sheet pile joint, (a) is sectional drawing before elastic deformation, (b) is sectional drawing after elastic deformation. Sectional drawing of the principal part showing the situation of disposing the sealing material to the sheet pile joint of another embodiment. Sectional drawing of the principal part showing the situation of disposing the sealing material to the sheet pile joint of another embodiment. Sectional drawing of the principal part showing the situation of disposing the sealing material to the sheet pile joint of another embodiment.

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

FIG. 1 illustrates a steel pipe sheet pile P to which the steel pipe sheet pile connection structure of the present invention is applied.
The steel pipe sheet pile P has a mechanical joint 2 with another steel pipe 1 connected in the axial direction of the steel pipe 1 to each end of the steel pipe 1 by welding W.
Sheet steel joints 3 are provided on both sides of the steel pipe 1 and the mechanical joint 2 over substantially the entire length.

The steel pipe sheet piles P are sequentially erected so that the sheet pile joints 3 are fitted to each other at the installation target location, and are used to form a partition wall such as a retaining wall or a seawall by a group of steel pipe sheet piles that are continuously arranged horizontally.
Further, in the depth direction, a predetermined length dimension can be secured by fitting and connecting the mechanical joints 2 to add a plurality of steel pipe sheet piles P.
When the sheet pile joints 3 are fitted to each other and built to a predetermined depth, a grout material G such as mortar (low-strength mortar) is filled in a fitting space defined by the fitted sheet pile joints 3. Is done. At this time, a portion where the mortar is likely to flow out is filled with the mortar using a resin-made tubular bag J called a grout jacket, for example, to prevent the mortar from flowing out.

  The mechanical joint 2 includes a female box joint 2A welded to one end (for example, a lower end) of the steel pipe 1 and a box joint 2A welded to the other end (for example, the upper end) of the steel pipe 1. A male pin joint 2B having a structure capable of fitting and connecting is provided.

  The box joint 2A and the pin joint 2B are configured so as to be able to be fitted in a state where the two joints overlap inside and outside in the radial direction. Is configured. A key member (not shown) interposed between these two circumferential grooves is provided, and by positioning this key member over both the circumferential grooves, the shaft of the steel pipe 1 between the box joint 2A and the pin joint 2B is formed. The relative movement in the direction of the center can be restricted, and the corresponding steel pipes 1 can be connected.

In the present embodiment, the sheet pile joint 3 is formed of a steel material having a “C” -shaped cross section in the axial direction of the steel pipe (see FIG. 2).
Since the diameter of the mechanical joint 2 is larger than the diameter of the steel pipe 1, a notch 4 is formed in a portion of the sheet pile joint 3 corresponding to the mechanical joint 2.
The sheet pile joint 3 is attached to the side surface of the steel pipe 1 by welding W, and is attached to the side surface of the mechanical joint 2 by an adhesive A instead of welding, and a stop between the steel pipe 1 and the mechanical joint 2 and the sheet pile joint 3. Water is made.

As shown in FIG. 3A, a groove 7 is formed at a predetermined position on the upper end surface 3a of the sheet pile joint 3 located below the connecting end of the steel pipe sheet piles P so as to be open to the upper end surface 3a. Is formed. On the other hand, the lower end surface 3b of the sheet pile joint 3 located at the upper end at the connection end of the steel pipe sheet piles P is formed as a flat surface.
The predetermined location is a location where a gap is easily formed between a pair of vertically opposed sheet pile joints 3 even when the grout material G is filled in the fitting space between the sheet pile joints 3. 3 of the upper end surface 3a, the base end region on the mechanical joint 2 side and at least the region from the mechanical joint 2 to the grout material G filled in the fitting space of the sheet pile joints 3 or the grout material G. This is the region sandwiched (see FIG. 2). The base region refers to a region of the upper end surface 3a of the sheet pile joint 3 near the mechanical joint 2.

  As shown in FIGS. 1 to 3A and 3B, the sealing material S is provided in the groove 7 so as to extend over the two sheet pile joints 3.

  The seal material S is made of a synthetic resin or a rubber (synthetic rubber or natural rubber) made of an elastic material having water expandability, and is disposed in the concave groove 7. In the present embodiment, the sealing material S has an expansion ratio of about 2 times.

As shown in FIGS. 3A and 3B, the seal member S has a width slightly larger than the groove width of the concave groove 7 in a state before expansion, and is fitted into the concave groove 7. By doing so, it is configured to be elastically deformed by receiving a compressive force in the width direction, to increase the adhesiveness to the groove side surface 7a, and to make it difficult to come out.
In the state before expansion, the height of the sealing material S is such that the groove bottom 7b of the groove 7 of the sheet pile joint 3 of the steel pipe sheet pile P arranged below and the sheet pile joint 3 of the steel pipe sheet pile P connected above. The upper and lower mechanical joints 2 are connected to each other, and are elastically deformed by receiving a compressive force in the height direction in a state where the upper and lower mechanical joints 2 are connected to each other. It is configured so that water can be stopped.
That is, the upper and lower steel sheet piles P are connected only by the mechanical joint 2 so that the upper and lower sheet pile joints 3 are connected with the seal material S interposed therebetween, and the upper and lower sheet pile joints 3 compress the seal material S. By doing so, it is possible to stop water between the two sheet pile joints 3 by the elastically deformed seal material S.
When the sealing material S is fitted into the groove 7, no protrusion from the groove 7 is seen (see FIG. 3 (a)). It can be buried to stop water (see FIG. 3 (b)).
Note that the entirety of the sealing material S is not limited to being formed of a material having water swelling properties, and may be formed of a material having water swelling properties only in part.

  In addition, the sealing material S provided in the concave groove 7 formed in the base end region on the mechanical joint 2 side of the sealing material S adheres to the mechanical joint 2 and the grout material G in a state where the coupling operation is completed. I do. Further, the sealing material S provided in the concave groove 7 formed in the region sandwiched between the grout materials G in the sealing material S is in close contact with both grout materials G sandwiching the sealing material S in a state where the coupling operation is completed. I do.

According to the steel pipe sheet pile connection structure of the present embodiment, the steel pipe sheet piles P are reliably connected to each other by the mechanical joint 2, and the grout material G is filled in the fitting space also for the sheet pile joints 3 and Since the sheet material S is interposed between the facing surfaces of the sheet pile joints 3, the sheet joints 3 are connected in a state where water is stopped at the connection ends.
In addition, since the sealing material S can be fitted into the recessed groove 7 of the sheet pile joint 3, the labor for temporarily holding the sealing material S when connecting the steel pipe sheet piles P is omitted, and the sealing material S does not fall off. It can be located between the sheet pile joints 3 in this state.
Therefore, the work of connecting the steel pipe sheet piles P can be performed easily and quickly.
In addition, since no welding is used, no smoke or the like is generated, and adverse effects on the surrounding environment can be prevented.

[Another embodiment]
Hereinafter, other embodiments will be described.
<1> The steel pipe sheet pile P is not limited to the size and shape described in the above embodiment, but may be any known steel pipe sheet pile. For example, the shape of the mechanical joint 2 formed at both ends can be changed.

Further, the sheet pile joint 3 is not limited to a combination of steel materials having a cross-sectional shape of “C” as shown in FIG. 2. For example, as shown in FIG. 5C and a steel material 3T having a “T” -shaped cross-section, as shown in FIG. 5, two steel materials 3L having a “L” -shaped cross-section and a steel material having a “T” -shaped cross-section A configuration using a combination of 3Ts may be used.
Also in this case, even if the grout material G is filled in the fitting space between the sheet pile joints 3, the sealing material S is provided at a location where a gap is likely to be formed between the pair of sheet pile joints 3 facing up and down.

That is, in FIG. 4, a concave groove is formed in the base end region on the mechanical joint 2 side on the upper end surface 3 a of the sheet pile joint 3 </ b> C, and the sealing material S is disposed in this concave groove, and the upper end surface of the sheet pile joint 3 T is formed. 3a, a groove is formed in a region from the mechanical joint 2 to the grout material G filled in the fitting space between the sheet pile joints 3, and a sealing material S is provided in this groove.
The sealing material S disposed in the base end region of the upper end face 3a of the sheet pile joint 3C on the mechanical joint 2 side comes into close contact with the mechanical joint 2 and the grout material G in a state where the coupling operation is completed.
The sealing material S disposed in a region from the mechanical joint 2 on the upper end surface 3a of the sheet pile joint 3T to the grout material G filled in the fitting space between the sheet pile joints 3T is in a state where the connection work is completed. Then, it comes into close contact with the mechanical joint 2 and the grout material G.

In FIG. 5, a concave groove is formed in the upper end surface 3a of the two sheet pile joints 3L in the base end region on the mechanical joint 2 side, and a sealing material S is provided in the both concave grooves. A groove is formed on the end face 3a in a region from the mechanical joint 2 to the grout material G filled in the fitting space between the sheet pile joints 3, and the sealant S is provided in the groove.
The seal members S respectively disposed in the base end region on the mechanical joint 2 side of the upper end face 3a of the two sheet pile joints 3L come into close contact with the mechanical joint 2 and the grout material G in a state where the coupling operation is completed.
The sealing material S disposed in a region from the mechanical joint 2 on the upper end surface 3a of the sheet pile joint 3T to the grout material G filled in the fitting space between the sheet pile joints 3T is in a state where the connection work is completed. Then, it comes into close contact with the mechanical joint 2 and the grout material G.

Further, the sheet pile joint 3 is not limited to forming the notch 4 as shown in FIG. 1, and as shown in FIG. May be attached. Also in this case, even if the grout material G is filled in the fitting space between the sheet pile joints 3, the sealing material S is provided at a location where a gap is likely to be formed between the pair of sheet pile joints 3 facing up and down. That is, as shown in FIG. 4 and FIG. 5, the upper end surface 3a of the sheet pile joint has, in the upper end surface 3a of the sheet pile joint 3, the base end region on the mechanical joint 2 side and the region sandwiched by the grout material G. The groove 7 is formed, and the sealing material S is fitted into the groove 7.
The attachment position and the number of attachment points of the sheet pile joint 3 with respect to the steel pipe 1 can be changed. For example, the sheet pipe joint 3 may be provided at only one place in the circumferential direction of the steel pipe 1 or may be provided at three or more places. There may be some. Furthermore, the positional relationship between the plurality of sheet pile joints 3 in the circumferential direction can be appropriately changed.

<2> The formation position of the concave groove 7 for disposing the sealing material S is not limited to that described in the above embodiment.
For example, the concave groove 7 is not limited to being formed only on the upper end surface 3a of the sheet pile joint 3 located below at the connection end, but may be formed, for example, at the lower end surface 3b of the sheet pile joint 3 located above at the connection end. Only, or a concave groove 7 may be formed in each of the upper and lower sheet pile joints 3 facing each other at the connection end.

  Note that, as described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings. In addition, it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

Reference Signs List 1 steel pipe 2 mechanical joint 3 sheet pile joint 3C steel (sheet pile joint)
3T steel (sheet pile joint)
3L steel (sheet pile joint)
4 Notch 7 Groove P Steel pipe sheet pile A Adhesive G Grout material J Jacket W Welding S Seal material

Claims (4)

Along with connecting the mechanical joints provided at the connection end of the steel pipe in the axial direction of the steel pipe,
A steel pipe sheet pile connection structure capable of fitting the sheet pipe joints provided on the side surfaces of the steel pipe and the mechanical joint and connecting them in a radial direction of the steel pipe,
The sheet pile joint is formed of a C-shaped steel material in which a cross-sectional shape of the mechanical joint in an axial direction is partially cut out of a circle, and the steel material has the cut-out portion. A part that is not cut open is attached to at least the steel pipe so that it is not located on a line connecting the axis of the steel material and the axis of the mechanical joint,
The sheet pile joint is a space defined by another sheet pile joint fitted to each other, in a space defined by an inner surface of one sheet pile joint and an outer surface of the other sheet pile joint, and Along with being configured so that grout material can be filled in all of the space defined by the inner surface,
The end face of at least one of the pair of sheet pile joints opposed in the axial direction of the steel pipe, a part of the base end region on the mechanical joint side, or from the mechanical joint, the one sheet pile. Any one of a part of the region up to the grout material filled in the space defined by the inner surface of the joint and the outer surface of the other sheet pile joint, and the inner surface of the one sheet pile joint and the other sheet pile Sealing material is provided in a part of a region defined by a space defined by an outer surface of the joint and a space defined by an inner surface of the double sheet pile joint,
At this time, the seal provided in a part of an area sandwiched by a space defined by an inner surface of the one sheet pile joint and an outer surface of the other sheet pile joint and a space defined by inner surfaces of the two sheet pile joints The steel pipe sheet pile connecting structure, wherein the material is provided on a line connecting an axis of the steel material and an axis of the mechanical joint. An end face of at least one of the pair of sheet pile joints facing the axial direction of the steel pipe is provided on the end face of the sheet pile joint so as to be open toward the end face of the other sheet pile joint. A concave groove is formed,
The sealing material is formed of an elastic body, and a height dimension of the sealing material is formed larger than a separation dimension between a groove bottom surface of the concave groove and an end face of the other sheet pile joint. 2. The steel pipe sheet pile connection structure according to 1.   The steel pipe sheet pile connection structure according to claim 2, wherein the seal material has water expandability. From the seal material or the mechanical joint provided in a part of the proximal end region on the mechanical joint side of the seal material, the seal material is divided into an inner surface of the one sheet pile joint and an outer surface of the other sheet pile joint. The sealing material provided in a part of the region up to the grout material filled in the space is in close contact with the mechanical joint and the grout material in a state where the connection work is completed, and the one sheet pile Sealing material provided in a part of a region sandwiched between a space defined by the inner surface of the joint and the outer surface of the other sheet pile joint and a space defined by the inner surfaces of the two sheet pile joints is completely connected. The steel pipe sheet pile connecting structure according to any one of claims 1 to 3, wherein in a state in which the sealing member is sandwiched, the sealing member is in close contact with the two grout members.

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