JPWO2011125347A1 - Connection structure of steel pipe sheet pile and steel sheet pile and its construction method - Google Patents

Abstract

The present invention provides a rational steel pipe sheet pile-to-steel sheet pile connection wall structure that is excellent in workability and capable of reducing construction costs, and a method for constructing the same, by providing a connection structure that can tolerate a certain degree of construction error. When connecting the steel pipe sheet piles 1 placed at intervals with the steel sheet pile 2 to form a connection wall structure, a connecting member 3 having a slit 3a continuous in the longitudinal direction is provided on the side of the steel pipe sheet pile 1, The end portion of the sheet pile 2 is fitted into the slit portion 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. Even if the construction of the steel pipe sheet pile 2 is stretched and shrunk by providing a sufficient space in the connecting part of the steel pipe sheet pile 1 and the steel sheet pile 2 to absorb construction errors, the end of the steel sheet pile 2 can be easily formed. Can be fitted and installed.

Description

  TECHNICAL FIELD The present invention relates to a steel pipe sheet pile and a steel sheet pile connection wall structure used for a revetment, a retaining wall, and a construction method thereof.

  The earth retaining wall such as a revetment or retaining wall is subjected to a force to bend the earth retaining member due to earth pressure or water pressure. As a result, the earth retaining wall is bent and deformed in the direction of the force, and in some cases it slides. There is a risk of falling.

  In the design of the retaining wall, in order to prevent the above-mentioned sliding and falling, it is deeply embedded and has sufficient cross-sectional rigidity to keep the deformation amount of the wall below the allowable value specified for the structure. The wall member is applied, and the optimum member, cross section, and length are determined within a range satisfying these from the viewpoint of economy. In addition, depending on the wall height, ground conditions, and seismic intensity at the time of an earthquake, the penetration length of the wall member into the ground becomes long, so it is important that the member is sufficiently excellent in workability.

  In general, as the retaining wall, there are (a) a self-supporting structure, (b) a stand-by structure, and (c) a cut beam structure as shown in FIG. In particular, when there is a restriction on the back site and a sufficient space cannot be secured, the self-supporting structure of (a) is applied.

  For example, a hat-shaped steel sheet pile 2 as shown in FIG. 7, for example, is used for the self-supporting structure. However, the revetment / retaining wall having a high wall height, the amount of deformation allowed for the wall is small, and sufficient wall rigidity is provided. For example, a steel pipe sheet pile 1 having excellent cross-sectional rigidity in which a fitting member 3 for fitting is provided on a steel pipe as shown in FIG. 8 is used.

  Steel sheet piles and steel pipe sheet piles are excellent in penetration into the ground, and there are various construction methods that meet the needs of the site. For example, when rapid construction is required, the vibro hammer construction method is used, and in urban areas where there are private houses in the vicinity, a hydraulic press-fitting method capable of low vibration and low noise construction can be applied. It is an excellent wall member.

  Moreover, as a prior art, Non-Patent Document 1 (Catalog of ArcelorMittal) includes a joint member 33 having a bowl-shaped cross section provided on a steel pipe sheet pile 1 as shown in FIG. 9 and a Z-shaped steel sheet pile (Z-shaped steel sheet pile). A technique is described in which a wall structure is formed by fitting two joints 32c in a manner similar to that of the steel sheet pile of FIG.

  Moreover, in patent document 1, as a breakwater using a steel pipe sheet pile and a straight sheet pile, between the steel pipe sheet piles installed at predetermined intervals, it is straight from the lower end part of the steel pipe sheet pile to the seabed ground surface or slightly above A breakwater with a sheet pile interposed is described.

  In addition, in Patent Document 2, a tubular joint having a slit is attached to a wall surface at an intersecting position where a plurality of steel sheet piles are connected to each other by connecting the sheet pile walls to each other as a connection structure of the deformed wall body constituting member. In addition, the one that can fit the end portion of the steel sheet pile of the other sheet pile wall is described.

Japanese Patent Laid-Open No. 02-213508 Japanese Patent No. 4231429

“Steel Sheet Piling General Catalog 2008”, ArcelorMittal, 2008, p.34

  In the wall structure described in Non-Patent Document 1 described above, generally, a steel pipe sheet pile is first driven at a predetermined interval, and then the steel sheet pile is connected in a form connecting the steel pipe sheet piles.

  However, since the space of the connecting portion is narrow, it is difficult to fit the connecting portion at the time of construction. In order to do this, a template for alignment is separately installed, and the placement is performed under strict management. Etc. are necessary. Therefore, there are problems of increase in construction cost and work on site.

  Also, depending on the case, due to striking and shrinking during construction, it is not possible to fit the members, and once the installed members have to be pulled out, it is necessary to place them again. There is also a risk that it may lead to an increase in construction period or construction period.

  On the other hand, it is conceivable to place steel pipe members and steel sheet piles alternately in the direction of the wall, but in this case too, the space for the connecting part is narrow, so it takes time to drive, and it is necessary to replace the casting machine for each member. It is unreasonable because it takes a lot of work and increases construction costs.

  Moreover, even when considering the water-stopping property, a space for sufficiently filling the water-stopping material is not provided, and it is difficult to sufficiently exert the water-stopping function as a wall.

  In the case of the invention described in Patent Document 1, which is a structure connecting a steel pipe sheet pile and a straight sheet pile, there is a problem similar to that of the invention described in Non-Patent Document 1.

  The present invention is intended to solve the problems in the prior art as described above, and a connection wall structure of a steel pipe sheet pile and a steel sheet pile formed by connecting steel pipe sheet piles placed at intervals with a steel sheet pile. The purpose is to provide a rational steel pipe sheet pile-to-steel sheet pile connection wall structure and its construction method that are excellent in workability and can reduce the construction cost by making the connection structure tolerate some construction error. Yes.

  The invention according to claim 1 of the present application is a connection wall structure of a steel pipe sheet pile and a steel sheet pile formed by connecting steel pipe sheet piles arranged at intervals with a steel sheet pile, and in a longitudinal direction on a side portion of the steel pipe sheet pile. By providing a connecting member having a continuous slit and fitting the end of the steel sheet pile to the slit portion from the longitudinal direction, the connecting member and the end of the steel sheet pile are connected. A play for absorbing construction errors between the steel pipe sheet piles is provided at a connecting portion with an end portion of the sheet pile.

  In principle, the present invention assumes that the steel sheet piles are driven in a form in which the steel pipe sheet piles previously driven at predetermined intervals are connected to each other. Even if the steel sheet pile placing device or method and the steel sheet pile placing device or placement method are different, the construction can be performed continuously without changing the device or placing method.

  In addition, when fitting the end of the steel sheet pile into the slit part of the connecting member provided on the steel pipe sheet pile, a certain play is formed, so that some construction error in the interval between the placed steel pipe sheet piles Even if there is, the installation position of the steel sheet pile can be adjusted in the wall direction, and construction can be performed smoothly.

  That is, in the invention described in Non-Patent Document 1, it must be constructed with high accuracy using a special template, making the construction difficult, and in the worst case, the construction may be impossible. Such excessive construction management is not required, the workability is improved, the construction period is shortened, and the cost can be reduced.

  According to a second aspect of the present invention, in the connecting wall structure of the steel pipe sheet pile and the steel sheet pile according to the first aspect, a water-stopping material is filled in the connecting member.

  This is a case where a water stop function is required for the wall structure, and it is necessary to secure a sufficient space for filling the water stop material together with play in the connecting portion between the connecting member and the end portion of the steel sheet pile. Thus, the wall structure can be given water-stopping properties.

  According to a third aspect of the present invention, in the connecting wall structure of the steel pipe sheet pile and the steel sheet pile according to the first or second aspect, a stopper member for preventing the steel sheet pile from coming out of the slit is provided at the end of the steel sheet pile. It is what.

  The stopper member is particularly effective in preventing the end portion of the steel sheet pile from slipping out of the slit of the connecting member during construction.

A fourth aspect of the present invention is the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to the first, second, or third aspect, wherein the connection member is substantially circular and has an outer diameter Φ (mm) and a plate thickness t (mm). Satisfying the relationship of the formula (1).

  Both ends of the steel sheet pile usually have claw portions (joints), but if the inner diameter of the connecting member is 70 mm or more (the outer diameter is (70 + 2t) mm or more), excessive construction management is not required. Can be easily fitted with a steel sheet pile. On the other hand, if the diameter of the joint member is too large, the workability may be hindered, but if it is 270 mm or less, the workability is good.

Φ：連結部材の外径、
ｔ：連結部材の板厚、
σ_y：連結部材に用いる鋼材の降伏応力、
P_y：鋼矢板が降伏に至る作用荷重、
ｂ：連結部材と鋼矢板とが嵌合されている長手方向の長さAccording to a fifth aspect of the present invention, in the connecting wall structure of the steel pipe sheet pile and the steel sheet pile according to the fourth aspect, the outer diameter Φ (mm) and the plate thickness t (mm) of the connecting member are further satisfied. It is a feature.

Φ: outer diameter of the connecting member,
t: thickness of the connecting member,
σ _y : Yield stress of steel used for connecting member,
P _y : Working load that causes the steel sheet pile to yield,
b: Length in the longitudinal direction in which the connecting member and the steel sheet pile are fitted

  If the shape of the joint member of the steel wall further satisfies the formula (2), it is more efficient in terms of material cost.

  Claim 6 is the connecting wall structure of the steel pipe sheet pile and the 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 in a cross section perpendicular to the axial direction. It is what.

  As a typical steel sheet pile having flat sections at both ends, a hat-shaped steel sheet pile as shown in FIG. 7 can be used.

  In this case, by setting the play to an interval corresponding to the width of the flat portion, a construction error corresponding to the interval can be allowed.

  A seventh aspect of the present invention is the connecting wall structure of the steel pipe sheet pile and the steel sheet pile according to the first to sixth aspects, wherein the steel sheet pile is a U-shaped steel sheet pile.

  In the case of a U-shaped steel sheet pile having no flat sections at both ends, the connecting operation can be smoothly performed by displacing the U-shaped steel sheet pile in the front-rear direction of the wall structure using play of the connecting portion.

  In the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to claims 1 to 7, the connection position of the steel sheet pile is eccentric from the neutral axis of the steel pipe sheet pile. .

  This is mainly for the adjustment of the wall surface position of the wall structure, and the improvement of workability by play is basically the same as in the case of claims 1-7.

  Claim 9 is the construction method of the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to any one of claims 1 to 8, wherein the steel pipe sheet pile is first placed at a predetermined interval, From the above, the steel sheet piles are placed in such a manner as to connect the steel pipe sheet piles.

  In the present invention, by connecting the steel pipe sheet pile and the steel sheet pile with play according to the construction error, even if some construction error occurs in the interval between the placed steel pipe sheet piles, it is connected as it is. Therefore, it is possible to construct a steel pipe sheet pile and a steel sheet pile connection wall structure with excellent workability.

  Further, when water-stopping is required, it can be easily handled by filling a space provided with play with a water-stopping material.

  About the withdrawal of the steel sheet pile end part at the time of construction, it can prevent detaching | leave from the connection part of a steel pipe sheet pile by providing a stopper member in the connection part of a steel sheet pile.

The structure of the connection part of the steel pipe sheet pile and steel sheet pile in one Embodiment of this invention is shown, (a) is a top view in case there is no construction error, (b) becomes the term space | interval of a steel pipe sheet pile narrower than a plan. (C) is a top view when the term interval of a steel pipe sheet pile becomes wider than planned. (A), (b) is a top view which shows the example of the connection member provided in a steel pipe sheet pile, respectively. (A)-(d) is the top view which showed the steel sheet pile which connects between steel pipe sheet piles, (a) is a hat-shaped steel sheet pile, (b) is a linear steel sheet pile, (c) is In the case of a U-shaped steel sheet pile, (d) is the case of a Z-shaped steel sheet pile. (A)-(c) is a top view which shows the example at the time of providing a stopper member in the connection part of the steel sheet pile edge part, respectively. (A), (b) is the top view which showed the structure at the time of connecting and decentering a steel sheet pile with respect to a steel pipe sheet pile, (a) is a hat-shaped steel sheet pile, (b) is a linear steel plate. This is the case with a sheet pile. (A)-(c) shows the example of the conventional general earth retaining structure, (a) is sectional drawing of a self-supporting structure, (b) is sectional drawing of a stand-alone structure, (c) FIG. 3 is a perspective view of a beam structure. It is sectional drawing which showed the form of the conventional hat-shaped steel sheet pile. It is a top view which shows an example of the conventional steel pipe sheet pile wall. 1 shows an example of a connection wall structure composed of a conventional steel pipe sheet pile and a Z-shaped steel sheet pile (structure described in Non-Patent Document 1), (a) is a plan view of the connection wall structure, and (b) is a steel pipe sheet pile and It is a top view which shows the detail of the joint part of a Z-shaped steel sheet pile. It is an analysis figure of the stress distribution in the connection part of embodiment of FIG. Numerical analysis of the relationship between the load P and the outer diameter Φ when deformation or behavior occurs when the plate thickness t of the connecting member is fixed to 11 mm and the outer diameter Φ is 100 mm, 125 mm, 165.2 mm, 200 mm It is the shown graph. It is the figure which replaced the structure of the connection part which concerns on this invention with the cantilever, and was modeled. 13 is a graph showing the relationship between the thickness t of a connecting member and the diameter Φ of the connecting member determined from the analysis by the cantilever model of FIG. It is the graph which showed the relationship between plate | board thickness t and the load P by the FEM analysis result of a joint part when the outer diameter of a connection member is fixed to (PHI) = 200mm and plate | board thickness is 11 mm, 14 mm, and 16 mm.

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

  FIG. 1 shows the structure of a connecting portion between a steel pipe sheet pile and a steel sheet pile in one embodiment of the present invention, (a) is a plan view when there is no construction error, (b) is a plan interval of steel pipe sheet piles. The top view in the case of becoming narrower, (c) is a top view in the case where the term interval of a steel pipe sheet pile becomes wider than planned.

  The connection wall structure of the present invention is a structure in which the steel pipe sheet pile 1 and the steel sheet pile 2 are connected, and a space for absorbing construction errors is provided in the connection portion. That is, when connecting steel pipe sheet piles 1 placed at intervals with steel sheet piles 2 to form a connection wall structure, a connecting member 3 having slits 3a continuous in the longitudinal direction is provided on the side of the steel pipe sheet pile 1. By fitting the end portion of the steel sheet pile 2 to the slit portion 3a from the longitudinal direction, the connection member 3 and the end portion of the steel sheet pile 2 are connected, and the connection portion between the connection member 3 and the end portion of the steel sheet pile 2 is connected. Is provided with a predetermined play u for absorbing construction errors between the steel pipe sheet piles 1.

  In the connection wall structure of the steel pipe sheet pile 1 and the steel sheet pile 2, depending on the case, the steel pipe sheet pile 1 and the steel sheet pile 2 are each prepared with a separate construction machine, and a wall structure is constructed. In that case, in consideration of workability, the case where the steel pipe sheet pile 1 is first driven and the steel sheet pile 2 is then driven, or the reverse case is assumed.

  At this time, if the space of the connecting portion between the steel pipe sheet pile 1 and the steel sheet pile 2 is small, the construction is difficult, and in the worst case, there is a concern that the connecting portion competes at the time of placing and may be damaged or cannot be placed. The

  Therefore, as shown in FIG. 1, the steel pipe sheet pile 1 excellent in workability is obtained by sufficiently securing a space corresponding to the construction error between the steel pipe sheet piles 1 allowed at the connecting portion of the steel pipe sheet pile 1 and the steel sheet pile 2. The connection wall structure of the steel sheet pile 2 can be constructed. Even in this case, construction may be performed while aligning using a template for the purpose of construction with high construction accuracy.

  That is, by providing a space sufficient to absorb construction errors in the connecting portion between the steel pipe sheet pile 1 and the steel sheet pile 2, construction extension of the steel pipe sheet pile 2 (see FIG. 1B) and contraction (FIG. 1 ( Even if c) occurs), the end portion of the steel sheet pile 2 can be easily fitted and installed.

  The connecting member of the steel pipe sheet pile 1 is, for example, a member (see FIG. 2 (b)) in which a steel pipe shown in FIG. 2 is combined with a member 3 (see FIG. 2 (a)) having a slit 3a and an angle 43, and a slit 43a is formed therebetween. And the like, as long as a sufficient space for securing the workability is secured.

  Further, the steel sheet piles are also the hat-shaped steel sheet piles 2 (see FIG. 3A), the linear steel sheet piles 12 (see FIG. 3B), and the U-shaped steel sheet piles 22 (see FIG. 3C). ), Z-shaped steel sheet pile 32 (see FIG. 3 (d)), etc., as long as it can be fitted with a connecting member of a steel pipe sheet pile, the shape is not particularly limited.

  Among these, the hat-shaped steel sheet pile 2 having a flat section (flat portion 2a) in the arm portions beside the joint portions 2b and 2c shown in FIG. Compared to the steel sheet pile 22, it is easy to set play u for striking and shrinking at the time of steel pipe sheet pile construction, and the workability is also excellent.

  Here, taking the structure of FIG. 1 (the same applies to FIG. 3A) as an example, the preferred shape of the connecting member 3 will be described.

  When the diameter of the connecting member 3 is too small, the 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, a 900-width hat-shaped steel sheet pile includes joint portions 2b and 2c having a length of about 50 mm at both ends. However, if the inner diameter of the connecting member 3 is 70 mm or more, excessive construction management is not required and the steel sheet pile 2 And can be easily fitted. On the other hand, the outer diameter is preferably 270 mm or less from the viewpoint of workability.

  Moreover, the yield strength of the wall body of FIG. 1 is determined by either the yield of the steel sheet pile 2 or the deformation of the connecting member 3 (see FIG. 10). That is, when one yields or deforms, the other has a sufficient strength. Therefore, it can be said that the condition (shape) in which the yield and deformation occur almost simultaneously is the most efficient. Such conditions will be described below using calculation examples.

Numerical analysis of the relationship between the load P and the outer diameter Φ when deformation or behavior occurs when the plate thickness t of the connecting member 3 is fixed to 11 mm and the outer diameter Φ is 100 mm, 125 mm, 165.2 mm, 200 mm FIG. 11 shows the result obtained by the above. In this analysis example, the yield stress of the steel material is σ = 400 N / m ² equivalent to that of general steel, and the connecting member 3 and the steel sheet pile 2 are in the longitudinal direction (in the direction perpendicular to the paper surface in FIG. 10) The bilinear model was applied as being fitted with a unit length of 1 mm).

  In FIG. 11, the linear gradient changes before and after the outer diameter Φ is 125 mm. This indicates that the deformation or behavior when the load P is reached is different before and after the outer diameter of 125 mm. Specifically, the steel sheet pile 2 yields mainly when Φ <125 mm, and is mainly connected when Φ> 125 mm. The member 3 is deformed.

  Next, the relationship between the outer diameter Φ of the connecting member 3 and the plate thickness t at the gradient change point as shown in FIG. 11 is obtained. Here, for simplification, the structure of the connecting portion is assumed to be a model in which a load P is applied to the tip of a cantilever (length L, depth direction length b, plate thickness t) as shown in FIG. . Strictly speaking, the length L indicates the length from the point where the connecting member 3 and the steel pipe main body of the steel pipe sheet pile 1 are fixed until the load is applied to the slit 3a of the connecting member 3. Then, for simplification, it was considered that this is equivalent to the outer diameter of the connecting member 3.

b：奥行き方向長さ、
t：梁（連結部材３）の板厚、
y：中立軸から梁端までの距離＝ｔ／２In this model, the bending moment M generated at the fixed end of the beam, the cross-sectional rigidity I of the beam, and the stress σ generated at the beam are expressed by equations (a) to (c), respectively.

b: Length in the depth direction,
t: Plate thickness of beam (connecting member 3),
y: Distance from neutral axis to beam end = t / 2

となる。Here, when the applied load the sheet pile reaches the yield and P _y, load acting on one of the beam when the sheet pile is to surrender is P _y / 2. Here, the gradient change point described above is a condition in which the beam (connecting member) and the sheet pile are simultaneously deformed / yield, that is, when the load P _y / 2 is applied to the beam, the stress of the beam is the yield stress σ _y. It is a condition to reach Therefore, substituting these into equation (c) and transforming,

It becomes.

Φ：連結部材３の外径、
ｔ：連結部材３の板厚、
σ_y：連結部材３に用いる鋼材の降伏応力、
P_y：鋼矢板２が降伏に至る作用荷重、
ｂ：連結部材３と鋼矢板２とが嵌合されている長手方向の長さFurther, the length L of the beam is replaced with the outer diameter Φ of the connecting member 3 from the equation (d) derived from the above cantilever beam model (that is, the following equation (2) ′), and this equation is shown in FIG. The validity of the application to the structure of is verified.

Φ: outer diameter of the connecting member 3,
t: thickness of the connecting member 3;
σ _y : Yield stress of steel used for connecting member 3
P _y : acting load that the steel sheet pile 2 yields,
b: Length in the longitudinal direction in which the connecting member 3 and the steel sheet pile 2 are fitted.

の関係が得られる。式（２）’’にｔ=１１（ｍｍ）を代入するとΦ≒１２９．５（ｍｍ）となり、ＦＥＭ解析で得られた解であるΦ＝１２５ｍｍと非常によく一致している。（図１３参照）The applied load P _y at the gradient change point in FIG. 11 is P _y = 0.125 (kN / mm). Further, the depth length b is b = 1 (mm), and the yield stress σ _{y of the} steel material used for the connecting member is σ _y = 400 (N / mm ² ) assuming general steel as described above, and these are expressed as follows. (2) Substituting for '

The relationship is obtained. Substituting t = 11 (mm) into equation (2) ″ yields Φ≈129.5 (mm), which agrees very well with Φ = 125 mm, which is a solution obtained by FEM analysis. (See Figure 13)

  As yet another verification, FEM analysis was performed when the outer diameter of the connecting member 3 was fixed to Φ = 200 mm and the plate thicknesses were 11 mm, 14 mm, and 16 mm. The result is shown in FIG. According to FIG. 14, the linear gradient changes before and after the plate thickness of 14 mm. On the other hand, according to Equation (2) ″, the thickness t when Φ = 200 mm is substituted is t≈13.7 mm, and this example also agrees very well with the gradient change point obtained from the FEM analysis.

The actual steel pipe sheet pile 1 is considered to have some variation in diameter, slit width, welding or the like when the connecting member 3 is processed or attached. It is preferable that the thickness t of the connecting member 3 be equal to or greater than the thickness of the gradient change point, that is, a structure satisfying the formula (2).

  The length of the steel sheet pile member need not be the same as that of the steel pipe sheet pile 1 and may be shorter than the steel pipe sheet pile 1 and should be longer than the wall height so that the back soil does not flow out as a wall. It ’s fine.

  Further, when a wall structure is expected to have a water stop function, it is generally performed to fill the connecting portion with a water stop material and perform a water stop treatment. Here, when the space of a connection part is narrow, since filling with a water stop material is difficult, it is not fully filled and there is a concern that a water stop function may not fully be exhibited.

  Therefore, it is possible to expect a sufficient water-stopping function by constructing a connection wall structure in which a space sufficient to fill the water-stopping material is filled in the connection portion between the steel pipe sheet pile 1 and the steel sheet pile 2, and construction related to water-stopping treatment. Costs and labor can be reduced.

  As the water stop treatment, after installing the wall, the connecting portion may be excavated by a water jet method or the like, and filled with mortar or water stop material. Therefore, it is desirable that the space of the connecting portion between the steel pipe sheet pile and the steel sheet pile be wide enough to be excavated 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 having a slit 3a of about 30 mm in a generally used steel pipe having a diameter of Φ165.2 mm as shown in FIG. By applying this, even after the steel sheet pile 2 is connected, it becomes possible to sufficiently fill the water-stopping filler.

  By providing a sufficiently wide space in the connection part of the steel pipe sheet pile 1 and the steel sheet pile 2, the workability and workability of water stop treatment are improved. There is a concern that

  Then, as shown to Fig.4 (a)-(c), by providing the stopper member 4 in the joint part 2c (claw part) of the steel sheet pile 2, it prevents that it detach | leaves from the connection part of the steel pipe sheet pile 1. FIG. be able to.

  As the stopper member 4 at this time, round steel, deformed bar steel, flat steel, and the like are conceivable, and other members may be used and are not particularly limited. Moreover, the stopper member 4 does not need to be provided over the longitudinal direction full length of the steel sheet pile 2, By making it discretely arranged, it can suppress the process cost, the distortion generation amount of the steel sheet pile 2 at the time of member installation, etc.

  FIG. 5 (a) shows a case where the hat-shaped steel sheet pile 2 is eccentrically connected to the steel pipe sheet pile 1, and the position of the steel sheet pile 2 is eccentric from the central axis of the steel pipe sheet pile 1 as a wall. Aligning the surface improves workability when installing a decorative panel on the front of the wall.

  Similarly, FIG. 5B shows a case where the linear steel sheet pile 12 is eccentrically connected to the steel pipe sheet pile 1.

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. Stopper 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, 43a ... Slit,
u ... play

鋼矢板の両端部には爪部（継手）が普通は備わっているが、連結部材の内径が７０ｍｍ以上（外径としては（７０＋２ｔ）ｍｍ以上）であれば、過度な施工管理が要求されず、鋼矢板と容易に嵌合することができる。一方、継手部材の径が大きすぎると施工性に支障をきたす恐れがあるが、２７０ｍｍ以下であれば施工性が良好である。

Φ：連結部材の外径、
ｔ：連結部材の板厚、
σy：連結部材に用いる鋼材の降伏応力、
Py：鋼矢板が降伏に至る作用荷重、
ｂ：連結部材と鋼矢板とが嵌合されている長手方向の長さ
鋼製壁の継手部材の形状がさらに式（２）を満たしていれば、材料コスト面でもより効率的である。 The invention according to claim 1 of the present application is a connection wall structure of a steel pipe sheet pile and a steel sheet pile formed by connecting steel pipe sheet piles arranged at intervals with a steel sheet pile, and in a longitudinal direction on a side portion of the steel pipe sheet pile. By providing a connecting member having a continuous slit and fitting the end of the steel sheet pile to the slit portion from the longitudinal direction, the connecting member and the end of the steel sheet pile are connected. A play for absorbing construction errors between the steel pipe sheet piles is provided at the connecting portion with the end of the sheet pile ,
The connecting member is substantially circular, and the relationship between the outer diameter Φ (mm) and the plate thickness t (mm) satisfies the relationship of the formula (1),
The outer diameter Φ (mm) and the plate thickness t (mm) of the connecting member, and further satisfy the condition of the formula (2) .

Both ends of the steel sheet pile usually have claw portions (joints), but if the inner diameter of the connecting member is 70 mm or more (the outer diameter is (70 + 2t) mm or more), excessive construction management is not required. Can be easily fitted with a steel sheet pile. On the other hand, if the diameter of the joint member is too large, the workability may be hindered, but if it is 270 mm or less, the workability is good.

Φ: outer diameter of the connecting member,
t: thickness of the connecting member,
σy: Yield stress of steel used for connecting member,
Py: Working load that causes the steel sheet pile to yield,
b: Length in the longitudinal direction in which the connecting member and the steel sheet pile are fitted
If the shape of the joint member of the steel wall further satisfies the formula (2), it is more efficient in terms of material cost.

Claim 4 is the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to claims 1 to 3 , wherein the steel sheet pile is a steel sheet pile having flat sections at both ends in a cross section perpendicular to the axial direction. It is what.

According to a fifth aspect of the present invention, in the connecting wall structure of the steel pipe sheet pile and the steel sheet pile according to the first to fourth aspects, the steel sheet pile is a U-shaped steel sheet pile.

Claim 6 is the connecting wall structure of the steel pipe sheet piles and sheet pile according to claim 1 to 5, is characterized in that a connecting position of the steel sheet pile are allowed to eccentric from the neutral axis of the steel pipe sheet piles .

This is mainly for the adjustment of the wall surface position of the wall structure, and the improvement of workability by play is basically the same as in the case of claims 1-5 .

Claim 7 is the construction method of the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to any one of claims 1 to 6 , wherein the steel pipe sheet pile is first placed at a predetermined interval, From the above, the steel sheet piles are placed in such a manner as to connect the steel pipe sheet piles.

Claims (9)

  In a steel pipe sheet pile and a steel sheet pile connection wall structure formed by connecting steel pipe sheet piles placed at intervals, a connecting member having a slit continuous in the longitudinal direction is provided on the side of the steel pipe sheet pile, By fitting the end portion of the steel sheet pile into the slit portion from the longitudinal direction, the connection member and the end portion of the steel sheet pile are connected, and the connection portion between the connection member and the end portion of the steel sheet pile is connected to the connection portion. A connecting wall structure of a steel pipe sheet pile and a steel sheet pile characterized by providing play for absorbing construction errors between the steel pipe sheet piles.   The connection wall structure of the steel pipe sheet pile and the steel sheet pile according to claim 1, wherein a water-stopping material is filled in the connection member.   The connecting wall structure of the steel pipe sheet pile and the steel sheet pile according to claim 1 or 2, wherein a stopper member is provided at an end portion of the steel sheet pile to prevent the steel sheet pile from coming out from the slit. 4. The steel pipe according to claim 1, wherein the connecting member has a substantially circular shape, and a relationship between an outer diameter Φ (mm) and a plate thickness t (mm) satisfies the relationship of the formula (1). Connecting wall structure of sheet pile and steel sheet pile.

The steel pipe sheet pile and steel sheet pile connection wall structure according to claim 4, wherein an outer diameter Φ (mm) and a plate thickness t (mm) of the connection member are satisfied, and further, a condition of formula (2) is satisfied.

Φ: outer diameter of the connecting member,
t: thickness of the connecting member,
σ _y : Yield stress of steel used for connecting member,
P _y : Working load that causes the steel sheet pile to yield,
b: Length in the longitudinal direction in which the connecting member and the steel sheet pile are fitted   The said steel sheet pile is a steel sheet pile which has a flat area in the both ends in the cross section orthogonal to an axial direction, The connection wall of the steel pipe sheet pile and steel sheet pile as described in any one of Claims 1-5 characterized by the above-mentioned. Construction.   The said steel sheet pile is a U-shaped steel sheet pile, The connection wall structure of the steel pipe sheet pile and steel sheet pile as described in any one of Claims 1-6 characterized by the above-mentioned.   The connection position of the steel sheet pile and the steel sheet pile according to any one of claims 1 to 7, wherein a connection position of the steel sheet pile is eccentric from a neutral axis of the steel pipe sheet pile.   It is the construction method of the connection wall structure of the steel pipe sheet pile and the steel sheet pile according to any one of claims 1 to 8, wherein the steel pipe sheet pile is first placed at a predetermined interval, and the steel sheet pile is later attached. A construction method of a connecting wall structure of steel pipe sheet piles and steel sheet piles, wherein the steel pipe sheet piles are driven in a form of connecting them.

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