CN102713074B - Connected wall structure consisting of steel pipe sheet piles and steel sheet pile, and method of constructing same - Google Patents

Abstract

The present invention provides a reasonable connection wall structure of steel pipe sheet piles and steel sheet piles and a construction method thereof, which are excellent in workability and can reduce construction costs by forming a connection structure that allows a certain degree of construction error. When the steel pipe sheet piles (1) piled at intervals are connected to each other by the steel sheet piles (2) to form a connected wall structure, the steel pipe sheet piles (1) are provided on the side with The connection member (3) of the slit (3a) fits the end of the steel sheet pile (2) into the slit (3a) from the longitudinal direction. A predetermined play (u) for absorbing construction errors between the steel pipe sheet piles (1) is provided at the connecting portion. By providing a sufficient space at the joint between the steel pipe sheet pile (1) and the steel sheet pile (2), which can absorb construction errors, even if the steel pipe sheet pile (2) undergoes piling extension or piling contraction due to construction, it can be easily corrected. The end parts of the steel sheet pile (2) are fitted and installed.

Description

Connecting wall structure of steel pipe sheet pile and steel sheet pile and construction method thereof

technical field

The present invention relates to a connection wall structure of steel pipe sheet piles and steel sheet piles used for retaining walls such as breakwaters and retaining walls, and a construction method thereof.

Background technique

In retaining walls such as breakwaters and retaining walls, forces that intend to bend the retaining members act due to earth pressure and water pressure. As a result, the retaining wall is bent and deformed in the direction of the force. , there will be worries about slipping and collapsing.

In the design of the retaining wall, a wall with sufficient cross-sectional rigidity should be used to prevent the above-mentioned sliding and collapse from occurring to a sufficient depth, and to suppress the deformation of the wall below the allowable value specified by the structure. For members, from the viewpoint of economic efficiency, the most suitable member, section, and length are determined within the range satisfying the above conditions. In addition, since the wall member penetrates into the foundation length due to differences in wall height, foundation conditions, and seismic intensity during an earthquake, it is important to have sufficiently excellent workability of the member.

Usually, as a retaining wall, as shown in Figure 6, (a) self-supporting structure (Japanese: self-supporting structure: gravity retaining wall structure), (b) anchor type (Japanese: control え type) structure, (c) Horizontal support type (Japanese: cut beam type) structure, which is used separately according to the purpose. In particular, the self-supporting structure of (a) is applied when a sufficient space cannot be secured due to restrictions on the backside site.

In a self-supporting structure, as an example, a hat-shaped steel sheet pile 2 as shown in Fig. 7 is used, however, in a breakwater or a retaining wall with a relatively high wall height, the allowable deformation amount of the wall is small On the other hand, when sufficient wall rigidity is required, steel pipe sheet piles 1 having excellent cross-sectional rigidity in which connecting members 3 for fitting are provided on steel pipes as shown in FIG. 8 are often used.

Steel sheet piles and steel pipe sheet piles have excellent penetrability into the foundation, and various construction methods exist according to the needs of the site. For example, when high-speed construction is required, the vibratory hammer method, etc. are used, and in urban areas where there are residential buildings nearby, steel sheet piles and steel pipe sheet piles are hydraulic pressure that can be used for low-vibration and low-noise construction. A wall member with excellent workability, such as by press-fitting method.

In addition, as a prior art, Non-Patent Document 1 (catalogue of Alselor Mitterl Co., Ltd.) describes a technique in which a joint member 33 with a hook-shaped cross-section provided on a steel pipe sheet pile 1 as shown in FIG. 9 A wall structure is formed by fitting with the joint 32c of the Z-shaped steel sheet pile (the steel sheet pile which connected two Z-shaped steel sheet piles 32 and formed substantially the same form as the steel sheet pile of FIG. 7).

In addition, Patent Document 1 describes, as a breakwater using steel pipe sheet piles and linear sheet piles, a breakwater configured by placing steel pipe sheet piles at predetermined intervals between steel pipe sheet piles. The linear sheet pile is interposed from the lower end of the steel pipe sheet pile to a position equal to or slightly above the seabed ground surface.

In addition, Patent Document 2 describes, as a connection structure of special-shaped wall structural members, a connection structure in which a cylindrical joint having a slit is attached to a wall surface at an intersection position where sheet pile walls are connected. It is formed by fitting together several steel sheet piles by joints, and the edge part of the steel sheet pile of the other sheet pile wall can be fitted in the slit of this cylindrical joint.

Patent Document 1: Japanese Patent Application Laid-Open No. 02-213508

Patent Document 2: Japanese Patent No. 4231429

Non-Patent Document 1: "Steel Sheet Piling General Catalog 2008", ArcelorMittal, 2008, p.34.

In the wall structure described in the above-mentioned non-patent document 1, steel pipe sheet piles are usually piled at predetermined intervals first, and then the steel sheet piles are piled so as to connect the steel pipe sheet piles.

However, due to the narrow space of the joints, it is difficult to fit the joints during construction. In order to fit the joints, it is necessary to separately install a template for alignment and perform pile driving on the basis of strict management. Therefore, there is a problem that the construction cost increases, and labor and time for on-site work are required.

In addition, depending on the situation, due to elongation due to driving or shrinkage due to driving during construction, the components cannot be fitted, and the installed components have to be pulled out temporarily, and the piles must be driven again, etc. , Therefore, it may lead to a substantial increase in construction costs and an extension of the construction period.

On the other hand, it is also conceivable to alternately drive steel pipe members and steel sheet piles along the wall direction, but in this case, too, due to the narrow space at the connection portion, piling labor and time are consumed, and piling machines need to be replaced for each member, etc. , which leads to the consumption of construction labor and time and the situation that the construction cost is greatly increased, so it is unreasonable.

In addition, in consideration of water-stopping properties, since there is no space for sufficiently filling the water-stopping material, it is difficult to exhibit a sufficient water-stopping function as a wall.

In the invention described in Patent Document 1, which is a structure in which steel pipe sheet piles and linear sheet piles are connected, problems similar to those in the invention described in Non-Patent Document 1 exist.

Contents of the invention

The present invention seeks to solve the above-mentioned problems in the prior art, and its object is to set the connection wall structure of the steel pipe sheet pile and the steel sheet pile, which is formed by connecting steel pipe sheet piles piled at intervals with steel sheet piles, to allow A connection structure with a certain degree of construction error, thereby providing a reasonable connection wall structure of steel pipe sheet piles and steel sheet piles and a construction method thereof that are excellent in constructability and can reduce construction costs.

The invention of claim 1 of the present application is a connecting wall structure of steel pipe sheet piles and steel sheet piles, which is formed by connecting steel pipe sheet piles piled at intervals by steel sheet piles, and is characterized in that , by providing a connecting member having a continuous slit in the longitudinal direction on the side of the steel pipe sheet pile and fitting the end of the steel sheet pile into the slit portion from the longitudinal direction, the connecting member and the The end part of the steel sheet pile is connected, and the connection part of this connection member and the end part of a steel sheet pile is provided with the play for absorbing the construction error of said steel pipe sheet piles.

In principle, the present invention conceives that steel pipe sheet piles are first piled at predetermined intervals, and then the steel pipe sheet piles are piled between the steel pipe sheet piles so that the steel pipe sheet piles are connected to each other. In this case, even if there are steel pipe sheet piles Even when the piling device or the piling method of the pile is different from the piling device or the piling method of the steel sheet pile, construction can be continuously performed without changing the device or the piling method one by one.

On this basis, when the end of the steel sheet pile is fitted into the slit portion of the connecting member provided on the steel pipe sheet pile, since a predetermined play is already formed, even if the steel pipe sheet piles to be piled are separated Even if there is a certain degree of construction error in the interval, the installation position of the steel sheet pile can be adjusted along the wall direction, and construction can be carried out smoothly.

That is, in the invention described in Non-patent Document 1, construction has to be performed with high precision using a special formwork, and construction becomes difficult, and at worst, construction may not be possible. On the other hand, in the present invention, Such excessive construction management is not required, and the workability can be improved, and the construction period can be shortened and the cost can be reduced.

Claim 2 is the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to claim 1, wherein the connection member is filled with a water-stop material.

This is a case where a water-stop function is required in the wall structure, and a sufficient space for providing play and filling the water-stop material is secured in advance at the connection portion between the connecting member and the end of the steel sheet pile, and the wall structure can be given a water-stop function. watery.

Claim 3 is the connecting wall structure between a steel pipe sheet pile and a steel sheet pile according to Claim 1 or 2, wherein a stopper for preventing the end of the steel sheet pile from slipping out of the slit is provided at the end of the steel sheet pile. stop member.

In particular, during construction, the stopper member has a large effect for preventing the end of the steel sheet pile from slipping out from the slit of the connection member and detaching.

Claim 4 is the connecting wall structure of steel pipe sheet piles and steel sheet piles according to Claim 1, 2, or 3, wherein the connecting member is approximately circular, and its outer diameter Φ (mm) is equal to the plate thickness t (mm ) satisfies the relationship of formula (1).

Formula 1

70+2t≤Φ≤270···(1)

Usually, there are claws (joints) at both ends of the steel sheet pile, but if the inner diameter of the connecting member is 70 mm or more (the outer diameter is (70+2t) mm or more), it can be easily integrated without requiring excessive construction management. The steel sheet piles are fitted together. On the other hand, if the diameter of the joint member is too large, the workability may be hindered. However, if the diameter of the joint member is 270 mm or less, the workability is good.

Technical solution 5 is the connecting wall structure of steel pipe sheet piles and steel sheet piles according to technical solution 4, which is characterized in that the outer diameter Φ (mm) and plate thickness t (mm) of the above connecting member also satisfy the conditions of formula (2) .

Formula 2

$\mathrm{<span\; class="notranslate">\; \&Phi;</span>}<span\; class="notranslate">\; \&le;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

where Φ is the outer diameter of the connecting member,

t is the plate thickness of the connecting member,

σ _y is the yield stress of the steel used in the connecting structure,

P _y is the applied load to bring the steel sheet pile to yield,

b is the length in the longitudinal direction where the connecting member and the steel sheet pile are fitted.

If the shape of the joint member of the steel wall also satisfies formula (2), the material cost can be reduced more effectively

Claim 6 is the connection wall structure of a steel pipe sheet pile and a steel sheet pile according to Claims 1 to 5, wherein the steel sheet pile is a steel sheet pile having flat sections at both ends of a cross section perpendicular to the axial direction. .

A hat-shaped steel sheet pile etc. as shown in FIG. 7 can be used as a representative of the steel sheet pile which has such a flat section in both end parts.

In this case, by making the play an interval corresponding to the width of the flat portion, it is possible to allow a construction error corresponding to the interval.

Claim 7 is a connection wall structure of a steel pipe sheet pile and a steel sheet pile according to Claims 1 to 6, wherein the steel sheet pile is a U-shaped steel sheet pile.

In the case of the U-shaped steel sheet pile which does not have a flat section at both ends, the connecting work can be smoothly performed by displacing the U-shaped steel sheet pile in the front-rear direction of the wall structure using the play of the connecting portion.

Claim 8 is the connection wall structure of a steel pipe sheet pile and a steel sheet pile according to Claims 1 to 7, wherein the connection position of the steel sheet pile is eccentric from the neutral axis of the steel pipe sheet pile.

This is mainly for adjusting the position of the wall surface of the wall structure, and the effect of improving the workability by using the clearance is basically the same as that of technical proposals 1 to 7.

Claim 9 is a method for constructing a connecting wall structure between steel pipe sheet piles and steel sheet piles according to any one of claims 1 to 8, wherein the steel pipe sheet piles are first driven at predetermined intervals, and then, The said steel sheet pile is piled so that the said steel pipe sheet pile may be connected.

In the present invention, by forming a structure for ensuring play corresponding to construction errors in the connection between the steel pipe sheet pile and the steel sheet pile, even if a certain degree of construction error occurs in the interval between the steel pipe sheet piles to be piled, Direct connection is also possible, and a connection wall structure of a steel pipe sheet pile and a steel sheet pile excellent in workability can be constructed.

In addition, when water-stopping properties are required, it is possible to easily respond by filling the space provided with play with a water-stopping material.

When the steel sheet pile edge part falls out at the time of construction, it can prevent that a steel sheet pile edge part falls out from the connection part of a steel pipe sheet pile by providing a stopper member in the connection part of a steel sheet pile.

Description of drawings

Fig. 1 shows the structure of the connecting portion between a steel pipe sheet pile and a steel sheet pile according to an embodiment of the present invention, wherein Fig. 1(a) is a plan view without construction errors, and Fig. 1(b) is a steel pipe sheet pile The top view when the spacing is smaller than the design, and (c) in Figure 1 is the top view when the spacing of the steel pipe sheet piles is larger than the design.

(a) of FIG. 2 and (b) of FIG. 2 are plan views which each show the example of the connection member provided in the steel pipe sheet pile.

Fig. 3(a) to Fig. 3(d) are plan views showing steel sheet piles for connecting between steel pipe sheet piles, wherein Fig. 3(a) is a hat-shaped steel sheet pile, and Fig. 3(b ) is a case of a linear steel sheet pile, (c) of FIG. 3 is a case of a U-shaped steel sheet pile, and (d) of FIG. 3 is a case of a Z-shaped steel sheet pile.

(a) of FIG. 4 - (c) of FIG. 4 is a top view which shows the example in the case where a stopper member was provided in the connection part of the steel sheet pile edge part, respectively.

Fig. 5(a) and Fig. 5(b) are plan views showing the structure in which the steel sheet pile is eccentric to the steel pipe sheet pile and connected to the steel pipe sheet pile, and Fig. 5(a) is a hat-shaped steel sheet pile The case of Fig. 5 (b) is the case of linear steel sheet piles.

Figure 6(a) to Figure 6(c) show examples of conventional common soil retaining structures, wherein Figure 6(a) is a cross-sectional view of a self-supporting structure, and Figure 6(b) is an anchored structure As a cross-sectional view, (c) of FIG. 6 is a perspective view of the horizontal brace structure.

Fig. 7 is a cross-sectional view showing the form of a conventional hat-shaped steel sheet pile.

Fig. 8 is a plan view showing an example of a conventional steel pipe sheet pile wall.

Fig. 9 shows an example of a connecting wall structure composed of a conventional steel pipe sheet pile and a Z-shaped steel sheet pile (the structure described in Non-Patent Document 1), wherein (a) of Fig. 9 is a plan view of the connecting wall structure, and Fig. (b) is a plan view which shows the joint part of a steel pipe sheet pile and a Z-shaped steel sheet pile in detail.

FIG. 10 is an analysis diagram of the stress distribution in the connecting portion of the embodiment in FIG. 1 .

Figure 11 shows the relationship between the load P and the outer diameter Φ when deformation or movement occurs when the plate thickness t of the connecting member is fixed at 11 mm and the outer diameter Φ is set to 100 mm, 125 mm, 165.2 mm, and 200 mm. Graphics that represent numerical analysis.

FIG. 12 is a modeled view in which the structure of the connecting portion of the present invention is replaced by a cantilever beam.

13 is a graph showing the relationship between the plate thickness t of the connecting member and the diameter Φ of the connecting member obtained by analysis using the cantilever beam model in FIG. 12 .

Fig. 14 is a graph showing the relationship between the plate thickness t and the load P obtained from the FEM analysis results of the joint part when the outer diameter Φ of the connecting member is fixed at 200 mm and the plate thickness is set to 11 mm, 14 mm, and 16 mm. graphics.

Detailed ways

Hereinafter, the present invention will be described with reference to the drawings. In addition, this invention is not limited to embodiment shown below.

Fig. 1 shows the structure of the connecting portion between a steel pipe sheet pile and a steel sheet pile according to an embodiment of the present invention, wherein Fig. 1(a) is a plan view without construction errors, and Fig. 1(b) is a steel pipe sheet pile The top view when the spacing is smaller than the design, and (c) in Figure 1 is the top view when the spacing of the steel pipe sheet piles is larger than the design.

The connection wall structure of this invention is a structure for connecting the steel pipe sheet pile 1 and the steel sheet pile 2, and the space for absorbing a construction error is provided in the connection part. That is, when the steel pipe sheet piles 1 piled at intervals are connected by the steel sheet piles 2 to form a connected wall structure, by providing the steel pipe sheet piles 1 side portions with continuous slits 3a in the longitudinal direction, The structural member 3 fits the end of the steel sheet pile 2 into the slit 3a part from the longitudinal direction, so that the connecting member 3 and the end of the steel sheet pile 2 are connected, and the connecting member 3 and the end of the steel sheet pile 2 A play u is provided for absorbing construction errors between the steel pipe sheet piles 1 at the connecting portion.

In the connection wall structure of the steel pipe sheet pile 1 and the steel sheet pile 2, when different, the steel pipe sheet pile 1 and the steel sheet pile 2 prepare respectively different construction machines, and construct a wall structure. In this case, the case where the steel pipe sheet pile 1 is first piled and then the steel sheet pile 2 is piled, or the steel pipe sheet pile 2 is first piled and then the steel pipe sheet pile 1 is piled is assumed in consideration of workability.

At this time, if the space of the connecting portion of the steel pipe sheet pile 1 and the steel sheet pile 2 is small, construction becomes difficult, and in the worst case, there is a fear of damage or failure of pile driving due to mutual interference of the connecting portions during pile driving.

Therefore, as shown in FIG. 1 , by sufficiently securing a space corresponding to allowable construction errors between the steel pipe sheet piles 1 at the connecting portion of the steel pipe sheet pile 1 and the steel sheet pile 2 , it is possible to construct a steel pipe sheet pile with excellent workability. 1 and the steel sheet pile 2 connection wall structure. In addition, in this case, for the purpose of carrying out construction with high construction precision, you may perform construction while performing alignment using a formwork.

That is, by providing a sufficient space capable of absorbing construction errors in the connecting portion of the steel pipe sheet pile 1 and the steel sheet pile 2, even if the construction of the steel sheet pile 2 is elongated (see (b) in FIG. (c)) of 1, the edge part of the steel sheet pile 2 can be fitted and installed easily.

The connecting member of the steel pipe sheet pile 1 is not particularly limited, as long as it is a member that can secure a sufficient space in order to ensure workability, it is, for example, a steel pipe as shown in FIG. A member 3 with a slit 3a (see (a) in FIG. 2 ), a member in which angle steels 43 are combined and a slit 43a is formed between the angle steels 43 (see (b) in FIG. 2 ), and the like.

In addition, the shape of the steel sheet pile is not particularly limited, as long as it can be fitted with the connecting member of the steel pipe sheet pile, which is, for example, the hat-shaped steel sheet pile 2 shown in FIG. ), linear steel sheet pile 12 (see (b) of FIG. 3 ), U-shaped steel sheet pile 22 (see (c) of FIG. 3 ), Z-shaped steel sheet pile 32 (see (d) of FIG. 3 ), and the like.

Among them, the hat-shaped steel sheet pile 2 shown in (a) of FIG. 3 , which has a flat section (flat portion 2 a ) in the lateral arm portions of the joint portions 2 b and 2 c , is different from the ( Compared with the U-shaped steel sheet pile 22 of c), it is easy to set the play u corresponding to the piling extension and piling shrinkage during construction of the steel pipe sheet pile, and the workability is also excellent.

Here, the preferable shape of the connection member 3 is demonstrated taking the structure of FIG. 1 as an example (it is the same in (a) of FIG. 3).

When the diameter of the connection member 3 is too small, fitting with the steel sheet pile 2 becomes difficult. The inner diameter of the connecting member 3 is preferably 70 mm or more. For example, in a hat-shaped steel sheet pile with a width of 900mm, both ends have joints 2b and 2c with a length of about 50mm, and if the inner diameter of the connecting member 3 is 70mm or more, it can be easily installed without excessive construction management. Compatible with steel sheet piles. On the other hand, from the viewpoint of constructability, the outer diameter of the connecting member 3 is preferably 270 mm or less.

Moreover, the bearing capacity of the wall body of FIG. 1 is determined by yield of the steel sheet pile 2, or deformation|transformation (refer FIG. 10) of the connection member 3. That is, when one yields or deforms, the other has a margin in strength. Therefore, it can be said that the condition (shape) in which the above-mentioned yielding and deformation occur substantially simultaneously is the most efficient. Hereinafter, such a condition will be described using a calculation example.

Fig. 11 shows numerical values of the relationship between the load P and the outer diameter Φ when deformation or movement occurs when the plate thickness t of the connecting member 3 is fixed at 11 mm and the outer diameter Φ is set to 100 mm, 125 mm, 165.2 mm, and 200 mm. The results obtained from the analysis. In this analysis example, the yield stress of the steel is set to σ=400N/mm ² equivalent to ordinary steel, and in order to make the connection member 3 and the steel sheet pile 2 in the A bilinear (biliner) model is applied to the overall length (in terms of calculation, 1mm is set as the unit length) in the direction perpendicular to the paper surface.

In FIG. 11 , the slope of the straight line changes before and after the outer diameter Φ is 125 mm. This shows that the above-mentioned deformation or motion when the load P is reached becomes different before and after the outer diameter Φ is 125mm. Specifically, it shows that at Φ<125mm, the steel sheet pile 2 mainly yields, and at Φ > 125mm, mainly because the connecting member 3 is deformed.

Next, the relationship between the outer diameter Φ of the connecting member 3 and the plate thickness t at the slope change point as shown in FIG. 11 is obtained. Here, in order to simplify the structure of the connection part, assume a model in which a load P is applied to the tip of a cantilever beam (length L, depth direction length b, plate thickness t) as shown in FIG. 12 . Strictly speaking, the length L represents the length from the portion where the connecting member 3 and the steel pipe body of the steel pipe sheet pile 1 are fixed to the portion where the load acts on the slit 3a of the connecting member 3, but here, for the sake of simplification, , this length L was considered as the outer diameter of the connecting member 3 .

In this model, the bending moment M occurring at the fixed end of the beam, the section rigidity I of the beam, and the stress σ generated by the beam are represented by formulas (a) to (c) respectively.

Mathematical formula (3)

M＝P·L···(a)

Mathematical formula (4)

$\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>$

Mathematical formula (5)

$\mathrm{<span\; class="notranslate">\; \&sigma;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; L</span>}}{\frac{\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 12</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; )</span>$

Among them, b is the length in the depth direction,

t is the plate thickness of the beam (connecting member 3),

Y is the distance from the neutral axis to the end of the beam, t/2.

Here, when the applied load for the sheet pile to yield is P _y , the load acting on the beam on one side when the sheet pile yields is P _y /2. Here, the above-mentioned slope change point is the condition for simultaneous deformation/yielding of the beam (connected structural member) and the sheet pile, that is, it is the condition for the stress of the beam to reach the yield stress σ _y when the load P _y /2 is applied to the beam . Therefore, when the above conditions are substituted into the formula (c) and modified, the mathematical formula (6) is obtained.

Mathematical formula (6)

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; )</span>$

And, according to the formula (d) derived from the above cantilever beam model, the length L of the beam is replaced by the outer diameter Φ of the connecting member 3 (that is, the following formula (2)'), and the application of this formula to Fig. 1 when the structure is accurate.

Mathematical formula (7)

$\mathrm{<span\; class="notranslate">\; \&Phi;</span>}<span\; class="notranslate">\; \&le;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

Wherein, Φ is the outer diameter of the connecting member 3,

t is the plate thickness of the connecting member 3,

σy is the yield stress of the steel used in the connecting member 3,

Py is the applied load to make the steel sheet pile 2 yield,

b is the length of the longitudinal direction in which the connection member 3 and the steel sheet pile 2 are fitted.

The applied load Py at the slope change point in FIG. 11 is Py=0.125 (kN/mm). Furthermore, assuming that the depth b is b=1 (mm) and the yield stress σy of the steel material used for the connecting member is σy=400 (N/mm ² ) when it is assumed that ordinary steel is used as described above, When the above conditions are substituted into the formula (2)', the following relationship is obtained. Right now,

Mathematical formula (8)

$\mathrm{<span\; class="notranslate">\; \&Phi;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 400</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 125</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.07</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span>$

When t=11(mm) is substituted into the formula (2), Φ≈129.5(mm), which is very highly consistent with the solution obtained from FEM analysis, that is, Φ=125mm (see FIG. 13 ).

Furthermore, as another verification, FEM analysis was performed when the outer diameter of the connecting member 3 was fixed at Φ=200 mm, the plate thickness was Φ=200 mm, and the plate thicknesses were 11 mm, 14 mm, and 16 mm. The results are shown in FIG. 14 . From FIG. 14 , it can be seen that the slope of the straight line changes before and after the plate thickness is 14 mm. On the other hand, from Equation (2)", the plate thickness t when Φ=200mm is substituted is t≈13.7mm, and this example also agrees very highly with the slope change point obtained by FEM analysis.

For the actual steel pipe sheet pile 1, when processing and installing the connecting member 3, it is considered that there is a certain degree of deviation in the diameter, slit width or welding of the connecting member 3. Preferably, the steel pipe sheet pile 1 is a structure in which the plate thickness t of the connecting member 3 is equal to or greater than the plate thickness at the slope change point, that is, a structure that satisfies the formula (2).

Mathematical formula (9)

$\mathrm{<span\; class="notranslate">\; \&Phi;</span>}<span\; class="notranslate">\; \&le;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In addition, the length of the steel sheet pile member does not have to be the same as that of the steel pipe sheet pile 1, and may be shorter than the length of the steel pipe sheet pile 1. As a wall, it only needs to have a length greater than the wall height so that the soil on the back side does not flow out. .

And, when it is desired that the wall structure has a water-stopping function, usually, a water-stopping material is filled into the connecting portion and a water-stopping treatment is performed. Here, when the space of the connecting portion is narrow, filling of the water-stop material is difficult and cannot be sufficiently filled, so there is a concern that the water-stop function cannot be sufficiently exhibited.

Therefore, in order to fill the connection portion of the steel pipe sheet pile 1 and the steel sheet pile 2 with a connection wall structure with a sufficient space for filling the connection portion of the steel pipe sheet pile 1 and the steel sheet pile 2, a sufficient water sealing function can be expected, and the construction of water sealing treatment can be reduced. cost, labor and time.

As the water-stopping treatment, there is a method of digging the connecting portion with a water spray method or the like after installing the wall, and filling the inside with mortar and a water-stopping material. Therefore, as the space of the connection part of a steel pipe sheet pile and a steel sheet pile, it is preferable that it is the size which can excavate by the water jet method.

As an example of the connecting member 3 of the steel pipe sheet pile 1, there is a steel pipe type connecting member in which a generally used steel pipe with a diameter of Φ165.2 mm is provided with a slit 3 a of about 30 mm, as shown in FIG. 2( a ). By applying this steel pipe-type connecting member to the structural member, even after the steel sheet pile 2 is connected, the filling material for water stop can be sufficiently filled.

By providing a sufficiently large space at the connecting portion of the steel pipe sheet pile 1 and the steel sheet pile 2, the piling performance and the workability of the water stop treatment are improved. However, if the space is too large, there is a concern that the connecting portion will come off during pile driving.

Therefore, as shown in (a) to (c) of FIG. The connecting portion of the steel pipe sheet pile 1 is separated.

As the stopper member 4 at this time, it is conceivable to use round steel, deformed bar steel, flat steel, etc., but members other than these can also be used, and it is not particularly limited. Moreover, it is not necessary to provide the stopper member 4 over the entire length in the longitudinal direction of the steel sheet pile 2, and by disposing the stopper member 4 discretely, it is possible to suppress processing cost, deformation amount of the steel sheet pile 2 that occurs during member installation, and the like.

Since (a) of FIG. 5 shows the case where the hat-shaped steel sheet pile 2 is eccentrically connected to the steel pipe sheet pile 1 and connected to the steel pipe sheet pile 1, by making the position of the steel sheet pile 2 eccentric from the central axis of the The face of the wall is aligned, and when a decorative board is installed in front of the wall, etc., the workability is improved.

Similarly, (b) of FIG. 5 shows the case where the linear steel sheet pile 12 is eccentrically connected to the steel pipe sheet pile 1 with respect to the steel pipe sheet pile 1 .

Explanation of reference signs

1. Steel pipe sheet pile; 2. Steel sheet pile (hat-shaped steel sheet pile); 2a, flat part; 2b, 2c, joint part; 3. Connecting member; 3a, slit; 4. Stop member; 12. Linear Steel sheet pile; 12b, joint part; 22, U-shaped steel sheet pile; 22b, joint part; 32, Z-shaped steel sheet pile; 32b, 32c, joint part; 33, joint member; 43, angle steel; 43a, slit; u, clearance.

Claims (7)

1. A connecting wall structure of steel pipe sheet piles and steel sheet piles, which is formed by connecting steel pipe sheet piles piled at intervals by steel sheet piles, wherein: By providing a connecting member having a continuous slit in the longitudinal direction on the side of the steel pipe sheet pile and fitting the end of the steel sheet pile into the slit portion from the longitudinal direction, the connecting member and the steel plate The ends of the piles are connected, and a clearance for absorbing the construction error between the steel pipe sheet piles is provided at the connecting portion of the connecting member and the end of the steel sheet pile, and the connecting member is approximately circular, and its outer diameter is The relationship between Φ(mm) and plate thickness t(mm) satisfies the relationship of formula (1), Formula 1 70+21≤Φ≤270...(1) The outer diameter Φ (mm) and plate thickness t (mm) of the above-mentioned connecting members also satisfy the conditions of formula (2), Formula 2 $\mathrm{<span\; class="notranslate">\; \&Phi;</span>}<span\; class="notranslate">\; \&le;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$ Among them, Φ is the outer diameter of the connecting structural member, t is the plate thickness of the connecting structural member, σ _y is the yield stress of the steel used in the connecting structural member, P _y is the applied load for the steel sheet pile to yield, and b is the connecting structural member The length in the longitudinal direction fitted to the steel sheet pile. 2. The connecting wall structure of steel pipe sheet piles and steel sheet piles according to claim 1, wherein: The above connecting components are filled with water-stop material. 3. The connecting wall structure of steel pipe sheet piles and steel sheet piles according to claim 1, wherein: The end part of the said steel sheet pile is provided with the stopper member for preventing the edge part of the said steel sheet pile from slipping out of the said slit. 4. The connecting wall structure of steel pipe sheet piles and steel sheet piles according to claim 1, wherein: The said steel sheet pile is a steel sheet pile which has a flat section at both end parts in the cross section perpendicular|vertical to an axial direction. 5. The connecting wall structure of steel pipe sheet piles and steel sheet piles according to claim 1, wherein: The said steel sheet pile is a U-shaped steel sheet pile. 6. The connecting wall structure of steel pipe sheet piles and steel sheet piles according to claim 1, wherein: The connection position of the said steel sheet pile is eccentric|decentered from the neutral axis|shaft of the said steel pipe sheet pile. 7. A method for constructing a connecting wall structure between a steel pipe sheet pile and a steel sheet pile, which is the method for constructing a connecting wall structure between a steel pipe sheet pile and a steel sheet pile according to claim 1, wherein: First, the said steel pipe sheet piles are piled at predetermined intervals, and after that, the said steel pipe sheet piles are piled so that the said steel pipe sheet piles may be connected.