JP2001003354A - Steel pipe sheet pile and connecting structure of steel pipe sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase joint strength by projecting a plurality of join members in the same direction in the external surface axial direction of the main pipe of a steel pipe sheet pile and forming a plurality of through-holes to the main pipe among the joint members. SOLUTION: Tie plate-shaped joint members 2 in two rows are projected in the same direction at regular intervals in the external-surface axial direction of the main pipe 1 of the steel pipe sheet pile while the joints 2 are also installed similarly at the symmetric positions on the reverse side of the main pipe 1 as required, and a plurality of through-holes 3 are formed to sections held by the joints 2 in the main pipe 1, thus constituting the steel pipe sheet pile A. The joints 2 are driven to a ground towards the adjacent sheet pile A side, the inside of the main pipe 1 and sections surrounded by the joints 2 are excavated, earth-removed and washed, and filled with concrete, and the sheet pipes A are connected mutually in the case of the execution of works. The adhesive strength of concrete is increased by forming irregularities to the internal side faces of the joints 2 at request, and displacement is prevented by forming retaining sections guiding the joints 2 of the sheet pile A adjacent to the front end sections of the joints 2. Thus, the shear strength of the joint sections of the steel pipe sheet pile can be improved simply and remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe sheet pile having a joint structure and a connecting structure between steel pipe sheet piles, and more particularly to a steel pipe sheet pile and a connecting structure for a steel pipe sheet pile which are effective for a large-scale steel pipe sheet pile foundation. .

[0002]

2. Description of the Related Art Today, steel sheet pile foundations are indispensable as one of the bridge foundations. As shown in FIG. 13, for example, the steel pipe sheet pile foundation is connected to the joint members of the adjacent steel pipe sheet piles 50 by fitting them together.
A plurality of steel pipe sheet piles 50 are cast into the ground so as to have a closed shape such as a circular shape, an oval shape, and a rectangular shape, and the top slab concrete 51 is constructed in the internal space of the closed shape.

Conventionally, as a joint member of a steel pipe sheet pile foundation,
As shown in FIG. 14, a PP type is generally used. This PP joint member is provided with a slit 53a extending along the pipe axis direction in a circular steel pipe 53 having a smaller diameter than the steel pipe sheet pile main pipe 52.
2 attached to the outer surface. Then, in the construction, the adjacent steel pipe sheet piles 50 are put into the ground while fitting and locking each other's circular steel pipes 53 through the slits 53a. After discharging and washing, the circular steel pipe 53 is filled with mortar 54 to connect the steel pipe sheet piles 50 to each other.

Generally, a circular steel pipe 53 used for a PP joint member has an outer diameter of 165.2 mm and a plate thickness of 11 mm (or 9 m).
m), the one with no irregularities such as protrusions on the inner and outer surfaces is used. On the other hand, the mortar 54 to be filled has a compressive strength of 2
The thing of about 00kgf / cm ² is used.

[0005]

When a horizontal external force acts on the steel sheet pile foundation, a vertical shear force acts on the joint. If this shearing force is larger than the shear strength of the joint, the shear deformation of the joint rapidly increases, and the degree of reduction in the bending rigidity of the entire steel sheet pile foundation also increases.

As measures for increasing the bending stiffness of the entire foundation, it is conceivable to improve the shear strength of the joint or to increase the number of sheet piles 50. But,
In the case of increasing the bending rigidity of the entire foundation in a large-scale bridge foundation on which a large external force acts, if a method of increasing the number of the steel pipe sheet piles 50 is adopted, the scale of the foundation becomes excessively large, resulting in an uneconomical foundation. . Therefore, it is necessary to use a joint member having a large shear strength in order to increase the bending rigidity in a range where the scale of the foundation does not become excessive.

Further, the shear strength of the PP joint member is as follows:
It depends on the adhesive strength between the surface of the circular steel pipe 53 and the mortar 54, which is composed of the adhesive force and the frictional force. However, in the case of a PP type joint member, this adhesion is easily cut off. Therefore, in order to construct an economical large-scale bridge foundation with a steel pipe sheet pile foundation, a joint member having a greater shear strength than before has been required. .

By the way, the shear strength of the conventional PP joint member was about 25 to 35 tf / m per unit joint member length. The present invention has been made in view of the above points, and a steel pipe sheet pile capable of significantly improving the shear strength of a joint portion as compared with the conventional steel pipe sheet pile, and a steel pipe suitable for a large-scale steel pipe sheet pile foundation. It is an object to provide a connection structure for sheet piles.

[0009]

In order to solve the above-mentioned problems, the invention described in claim 1 is directed to a steel sheet pile main pipe and fixed to an outer surface of the steel pipe sheet pile main pipe and extending in the pipe axis direction. A steel pipe sheet pile having two or more rows of joint members protruding in the same direction together with a plurality of through holes provided in a part of the steel pipe sheet pile main pipe located between the joint members. It is intended to provide a steel pipe sheet pile.

According to the present invention, the filler is filled in the steel sheet pile main pipe, and the bending rigidity of the steel pipe sheet pile main pipe is improved. Also,
Through the through holes, it is possible to sufficiently clean and fill the narrow joint space in the joint member from inside the steel pipe sheet pile main pipe, which is a relatively large space, so that the filling operation is facilitated. Moreover, at least the bonding strength between the steel sheet pile main pipe and the filler in the joint space is improved by the presence of the through holes.

Next, a second aspect of the present invention is characterized in that a plurality of projections are provided on the surface of the joint member to form irregularities on the surface in the structure of the first aspect. It is. ADVANTAGE OF THE INVENTION According to this invention, since the unevenness | corrugation is formed in a joint member surface, in the joint space, while the adhesive strength of a steel pipe sheet pile main pipe and a filler improves, the adhesive strength of a joint member and a filler also increases. improves.

Next, according to a third aspect of the present invention, in addition to the structure of the first or second aspect, a locking portion for locking to an adjacent steel pipe sheet pile is provided on the joint member. It is characterized by having. ADVANTAGE OF THE INVENTION According to this invention, by providing an engaging part, while positioning at the time of driving between adjacent steel pipe sheet piles becomes easy, the clearance gap between the joint members which oppose in the mutually protruding direction in adjacent steel pipe sheet piles is small. Or, the leakage of the filler from the gap is reduced.

[0014] Next, a fourth aspect of the present invention is a steel pipe sheet pile main pipe, and two or more rows of joints that are fixed to the outer surface of the steel pipe sheet pile main pipe and extend in the pipe axis direction and protrude in the same direction. The steel pipe sheet pile according to any one of claims 1 to 3 is used as the steel pipe sheet pile, and the steel pipe sheet pile is connected with the joint members of adjacent steel pipe sheet piles. The joint member and the steel sheet pile main pipe are connected so as to form a joint space, and the joint space is filled with a filler.

[0014]

Next, a first embodiment of the present invention will be described with reference to the drawings. First, a steel pipe sheet pile A of the present embodiment will be described. As shown in FIG. 1, two rows of joint members 2 each formed of a strip are attached to the outer surface of a steel pipe sheet pile main pipe 1 by welding. Each joint member 2 extends in parallel with the pipe axis, and projects in the same direction from the outer surface of the steel sheet pile main pipe 1 at a predetermined interval from each other.
In FIG. 1, a set of joint members 2 constituting the joint portion of the steel pipe sheet pile A is shown only on one side of the steel pipe sheet pile main pipe 1, but it is also present at a symmetrical position on the opposite side.

Further, as shown in FIG. 1 (b), at the position B (the surface facing the adjacent steel pipe sheet pile at the time of driving) in the steel pipe sheet pile main pipe 1 between the two rows of the joint members 2 as shown in FIG. What
A plurality of through holes 3 are provided over the entire surface. Then, as shown in FIG. 2, each steel pipe sheet pile A is placed in the ground along the adjacent steel pipe sheet piles A, that is, with two rows of joint members 2 facing the adjacent steel pipe sheet piles A side. After digging, discharging, and washing the soil in the joint space C surrounded by the joint member 2 between the steel pipe sheet pile main pipe 1 and the adjacent steel pipe sheet piles A, concrete is put into each space. To connect the steel pipe sheet piles A to each other. These are performed along the position of the closed shape intended. In addition, top slab concrete is constructed in the constructed internal space of the closed shape to make a steel pipe sheet pile foundation.

In the steel pipe sheet pile A of the present embodiment, since the steel pipe sheet pile main pipe 1 is provided with a plurality of through holes 3 communicating with the joint space C, the concrete filling work is not necessarily carried out in each steel pipe sheet pile main pipe 1. It is not necessary to separately lay concrete injection pipes in each joint space C between the adjacent steel pipe sheet piles A to cast concrete. For example, when a pipe is laid only in the steel sheet pile main pipe 1 and concrete is injected, concrete is also filled into the joint space C through the through hole 3. Can be reduced.

That is, the conventional steel pipe sheet pile main pipe 1 is filled with concrete or the like in the steel pipe sheet pile main pipe 1 in order to increase the rigidity of the entire foundation by using a PP type joint having no hole. Compared with the case where the material is poured, the concrete placing operation can be simplified. Moreover, when the steel pipe sheet pile A having the above-described joint structure is used, in the joint space C, at least the portion B of the steel pipe sheet pile main pipe 1 has an adhesion strength with the concrete filled by the presence of the through holes 3. Is improved, and the shear strength of the joint portion of the steel pipe sheet pile A can be improved as compared with the conventional PP joint member 2.

As a result, the bending stiffness of the entire steel pipe sheet pile foundation can be greatly increased as compared with the prior art.
Steel pipe sheet pile foundations can now be applied to large-scale bridge foundations that were previously difficult to apply. Here, the joint member 2 is not limited to a band plate. For example, as shown in FIG. 3, the joint member 2 may project in a curved shape such as an arc shape.

Also, concrete is exemplified as the filler, but the filler is not limited to concrete, and any material such as mortar may be used as long as it exhibits a predetermined compressive strength. The cross-sectional shape of the opening of the through hole 3 is not limited to the above shape. The point is that the filler should just be large enough to flow into the joint space C side.

In the above embodiment, as shown in FIG. 2, an example is described in which the through holes 3 are provided in the steel sheet pile main part 1 between the right and left joint members 2, respectively. As shown, the through hole 3 may be provided only on the set side of one joint member 2, for example, only on the left side. In this case, although the shear strength of the joint is determined by the right portion of the steel sheet pile main pipe 1 where the through hole 3 is provided, there is a possibility that the shear strength is reduced as compared with the case where the through holes 3 are provided on both sides. The steel pipe sheet pile main 1 communicating with the joint space C is always only one (right) steel pipe sheet pile main 1, and the other (left) steel pipe sheet pile A is separated from the excavation, earth discharging and washing work. The filling work can be performed in the (right) steel pipe sheet pile main pipe 1 and the joint space C on the left side thereof. As described above, even when the through-hole 3 is provided only on the set side of the one joint member 2, it is possible to obtain a greater shear strength than the conventional PP type joint. However, in this case, the joint space C
It is easy for the soil and sand to be insufficiently washed. Therefore, it is preferable to provide a through hole on the set side of both joint members 2.

Further, in the above-described embodiment, the end portions of the joint members 2 of the respective sheet piles A are abutted with each other. However, the present invention is not limited to this, and the end portions of the joint members 2 may be arranged so as to overlap in the thickness direction. good. Also, the case where each set of the joint members 2 is configured in two rows is illustrated, but each set of the joint members 2 may be configured in three or more rows. Next, a second embodiment will be described with reference to the drawings. Note that the same members and the like as those in the above embodiment will be described with the same reference numerals.

The basic configuration of the steel pipe sheet pile A of this embodiment is the same as that of the first embodiment, except that a projection 4 as shown in FIG. The only difference is that irregularities are formed. The surface on which the irregularities are provided may be only on the facing surface side of the joint members 2 forming a row (the surface indicated by reference numeral 2a in FIG. 1). That is, in the first embodiment, the shear strength of the joint is determined by the cut-off between the steel sheet pile main pipe 1 and the concrete.
In the second embodiment, in addition to the adhesive strength between the steel pipe sheet pile main pipe 1 and the concrete, the adhesive strength between the projection 4 of the joint member 2 and the concrete also contributes to the improvement of the shear strength of the joint. In comparison, the shear strength of the joint is further increased.

Other configurations, operations and effects are the same as those of the first embodiment. Here, the projection 4 provided on the joint member 2
Is not limited to a checker-like form. For example, a plurality of spiral forms as shown in FIG. 6 or a plurality of horizontal sections perpendicular to the pipe axis direction as shown in FIG. A pattern close to the shape may be formed.

Further, for example, a stud dowel 5 as shown in FIG. 8 may be provided as a projection on the surface of the joint member 2 to improve the adhesion strength on the joint member 2 surface. Next, a third embodiment will be described with reference to the drawings. Note that the same members and the like as those in the above embodiment will be described with the same reference numerals. The basic configuration of the steel pipe sheet pile A of the present embodiment is the same as that of the first and second embodiments. However, as shown in FIG. The only difference is that a locking portion 6 for locking the member 2 is provided.

That is, in this embodiment, as shown in FIG. 9, a small-diameter steel pipe having a slit 6a formed along the pipe axis direction is fixed to the tip end of each joint member 2 as a locking portion. It is. In the first and second embodiments, since there is no guide that is used when the steel pipe sheet piles A are driven, the tip position of the steel pipe sheet piles A is displaced as the steel pipe sheet piles A are driven, and the adjacent steel pipes are displaced. There is a possibility that the distance between the sheet piles A is unnecessarily large, and all the steel pipe sheet piles A cannot be installed in a closed state. In particular, this is likely to occur when the actual hardness of the ground on which the foundation is built is uneven.

On the other hand, in the third embodiment in which the engaging portion 6 for engaging the joint member 2 of the adjacent steel pipe sheet pile A is provided at the distal end of the joint member 2, the steel pipe sheet pile previously driven is provided. A
Of the current steel pipe sheet pile A is guided by the engaging portion 6 of the steel pipe, that is, in a state where the lateral displacement is regulated, so that the tip of the steel pipe sheet pile A is hardly displaced and almost at a predetermined position. Can be cast. As a result, it becomes easy to install all the steel pipe sheet piles A in a desired closed state.

In the first and second embodiments, the gap between the joint members 2 of the adjacent steel pipe sheet piles A is increased, and the joint space C surrounded by the joint members 2 between the adjacent steel pipe sheet piles A is provided. There is a possibility that a part of the concrete poured into the interior may escape to the outside of the space through the gap. On the other hand, in this embodiment, since the front end of the joint member 2 is driven in a state where it is locked with the locking portion 6 of the joint member 2 of the adjacent steel pipe sheet pile A, the adjacent steel pipe sheet pile A A gap is hardly formed between the distal ends of the joint members 2. As a result, the concrete filled in the joint space C hardly escapes out of the joint space C, and it is economical and easy to fill the joint space C with concrete.

Other structures, operations and effects are the same as those of the first and second embodiments. Here, the form of the locking portion 6 provided on the joint member 2 is not limited to the PP type. For example, a PT type formed of a T-shaped plate and a small-diameter steel pipe with a slit as shown in FIG. It may be a mold or an LT type comprising a T-shaped plate and a box with a slit as shown in FIG. In addition, as shown in FIG. 12, the joint member 2 and the locking portion 6 may be configured by combining angles.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Steel pipe sheet piles A having joints according to claim 1 and 2 are manufactured in a room, respectively.
And the shear strength of the joint was investigated. Claim 1
The shear strength of the specimens connected with sheet piles described in
It was 120 tf / m. In addition, the shear strength of the test piece in which the sheet piles described in claim 2 were connected to each other was 360 tf / m.

As described above, the connection structure of any of the sheet piles is as follows.
It can be seen that by employing the present invention, a significantly higher shear strength can be obtained as compared with the results of laboratory experiments (about 25 to 35 tf / m) of the conventional PP joint member 2.

[0031]

As described above, when the present invention is employed, the shear strength of the joint portion of the steel pipe sheet pile can be significantly reduced by the simple means of providing the through hole as compared with the conventional PP-type joint member. There is an effect that it can be improved.
In addition, the number of times the pipe is laid for filling concrete can be reduced.

In particular, when the steel pipe sheet pile according to claim 2 is used, the shear strength of the joint portion can be further improved.
In addition, when the steel pipe sheet pile according to claim 3 is used, the displacement of the driving position of the steel pipe sheet pile can be reduced, and the joint space can be economically filled with the filler.

By adopting the steel pipe sheet pile connecting structure according to the fourth aspect, the bending rigidity of the entire steel pipe sheet pile foundation can be greatly increased as compared with the conventional case.
There is an effect that the steel pipe sheet pile foundation can be applied to a large-scale bridge foundation which was difficult to apply before.

[Brief description of the drawings]

FIG. 1 is a view showing a steel pipe sheet pile according to a first embodiment of the present invention, wherein (a) is a plan view and (b) is a side view.

FIG. 2 is a diagram illustrating connection of steel pipe sheet piles according to the first embodiment of the present invention.

3A and 3B are diagrams showing another example of the steel pipe sheet pile according to the first embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

FIG. 4 is a view illustrating connection of steel pipe sheet piles according to the first embodiment of the present invention.

FIG. 5 is a view showing an example of an uneven pattern formed on the surface of a joint member according to a second embodiment of the present invention.

FIG. 6 is a diagram showing another example of the uneven pattern formed on the surface of the joint member according to the second embodiment of the present invention.

FIG. 7 is a diagram showing another example of the uneven pattern formed on the surface of the joint member according to the second embodiment of the present invention.

FIG. 8 is a diagram showing another example of the uneven pattern formed on the surface of the joint member according to the second embodiment of the present invention.

FIG. 9 is a view for explaining connection of a steel pipe sheet pile according to a third embodiment based on the present invention.

FIG. 10 is a diagram illustrating connection of steel pipe sheet piles according to a third embodiment of the present invention.

FIG. 11 is a view for explaining connection of a steel pipe sheet pile according to a third embodiment based on the present invention.

FIG. 12 is a view for explaining connection of a steel pipe sheet pile according to a third embodiment based on the present invention.

FIG. 13 is a view showing an example of a steel pipe sheet pile foundation.

FIG. 14 is a view showing connection of a conventional steel pipe sheet pile.

[Explanation of symbols]

 Reference Signs List A steel pipe sheet pile B through-hole forming part C joint space 1 steel pipe sheet pile main pipe 2 joint member 2a surface on which projection is provided 3 through hole 4 projection 6 locking part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoji Hashimoto 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Inventor Hiroshi Kazama 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction F-term (in reference) 2D049 FB03 FB14 FC02 FC03 FC04 FC15 FD03

Claims (4)

[Claims] 1. A steel pipe sheet pile comprising: a steel pipe sheet pile main pipe; and two or more rows of joint members fixed to the outer surface of the steel pipe sheet pile main pipe and extending in the pipe axis direction and projecting in the same direction. The portion of the steel pipe sheet pile main located between the joint members,
A steel pipe sheet pile provided with a plurality of through holes. 2. The joint member according to claim 1, wherein a plurality of projections are provided on a surface of the joint member, and irregularities are formed on the surface.
Steel sheet pile described in 1 above. 3. The joint member according to claim 1, wherein an engaging portion for engaging an adjacent steel pipe sheet pile is provided.
Or the steel pipe sheet pile according to claim 2. 4. A connecting structure for a steel pipe sheet pile comprising: a steel pipe sheet pile main pipe; and two or more rows of joint members fixed to the outer surface of the steel pipe sheet pile main pipe and extending in the pipe axis direction and projecting in the same direction. In the steel pipe sheet pile, the steel pipe sheet pile according to any one of claims 1 to 3 is used, and in the steel pipe sheet pile, joint members of adjacent steel pipe sheet piles are engaged with each other, and the joint member and the steel pipe sheet pile are joined. A joint structure for connecting steel sheet piles, wherein the joint space is surrounded by a main pipe so as to be constituted, and the joint space is filled with a filler.