JP4645522B2 - Anti-earth pressure structure, its saddle plate, and anti-earth pressure structure construction method - Google Patents

Description

  The present invention relates to an anti-earth pressure structure, a saddle plate thereof, and a method for constructing an anti-earth pressure structure, and more particularly, earth pressure and The present invention relates to an anti-earth pressure structure that supports external forces such as water pressure, a saddle plate therefor, and a method for constructing an anti-earth pressure structure.

  As a steel anti-earth pressure structure in the coastal area, as shown in FIG. 1, a pier type structure combining a structure in which a floor slab 12 is placed on a row of steel pipe piles 10 and an L-shaped block 14 or the like, As shown in FIG. 2, a sheet pile structure in which a steel sheet pile (or steel pipe sheet pile) 20, a tie rod 22 and a retaining pile 24 are combined is common.

However, if the deepwater areas, soft ground such conditions and rapid construction or the like is required, as shown in FIG. 3, (also called jacket type structure) steel framework supporting the steel tube scaffold 30 in the steel pipe pile 10 For example Has a structural advantage. This is described in detail in Non-Patent Document 1.

  In this steel pipe frame structure, the earth retaining structure on the back surface is generally constructed by a gravity type structure such as the L-shaped block 14 shown in FIG. 3 or a built-in type structure such as a U-type steel sheet pile or a steel pipe sheet pile. However, as a structure having more economical efficiency and structural rationality, the applicant, as disclosed in Patent Document 1, shows a horizontal section in FIG. 4, and the earth retaining portion is replaced with an arc wall 40 made of a straight steel sheet pile 42 (or steel plate). It proposes a structure to build by.

  4, 32 is a steel pipe leg on the land side of the steel pipe frame 30 (hereinafter simply referred to as a land side leg), 34 is a steel pipe leg other than the land side (hereinafter referred to as a sea side leg), 44 is A saddle plate 50 for joining the arc wall 40 and the steel pipe pile 10 is a mortar grout filled between the saddle plate 44 and the land leg 32.

JP 2005-194867 A Coastal Technology Research Center “Jacket Construction Technology Manual” January 2000

  In the structure according to Patent Document 1, earth pressure generated by burying the back side of the arc wall 40 portion by the linear steel sheet pile 42 or external force generated by residual water pressure is replaced with hoop tension, and this hoop tension is passed through the saddle plate 44. By transmitting to the land-side leg 32 of the steel pipe frame 30 disposed on both sides of the arc wall 40 and the steel pipe pile 10 that has been driven through the land-side leg 32 to the bottom of the seabed, is doing. The depth of the straight steel sheet pile 42 to the seabed is set so as to secure a safety factor against arc slip generated from the landfill board. That is, the linear steel sheet pile 42 also plays a role to counteract the shearing force in the ground that is generated to cause the arc slip. Therefore, it is necessary to firmly transmit the force that the saddle plate 44 pushes to the sea side to the land side leg 32 of the steel pipe frame 30 and the steel pipe pile 10 below the land side leg 32.

  However, regarding the saddle plate 44 that connects the land side leg 32 and the steel pipe pile 10 and the arc wall 40 constructed by the linear steel sheet pile 42, etc., as a result of examining the detailed structure and construction method for realizing this structure, It turned out that the level | step difference S of the land side leg 32 and the steel pipe pile 10 becomes a problem as shown in FIG. That is, when earth pressure is applied, the step S causes the arc wall (saddle plate 44) to be pushed and deformed toward the steel pipe pile 10 as shown in FIG. And the stress which arises in the linear steel sheet pile 42 will become large. Furthermore, it is difficult to grasp the magnitude of the stress and to design.

  In addition, it is conceivable to provide a guide for fixing the saddle plate 44 on the land side leg 32. However, in a general construction method in which the steel pipe pile 10 is driven after the steel pipe frame 30 is installed to form a steel pipe frame structure, 10 cannot be attached with a fixing guide. In addition, a mortar grout 50 is provided between the land side leg 32 and the saddle plate 44 for integration. However, since there is no fixing guide between the steel pipe pile 10 and the saddle plate 44, integration with a normal mortar grout is performed. There were also problems such as difficulty in conversion.

  The present invention has been made to solve the above-mentioned conventional problems, and the force that the arc wall pushes to the sea side can be securely transmitted to the leg of the steel pipe frame and the pile below the leg. It is an object to provide a simple anti-earth pressure structure.

The present invention includes a steel pipe frame structure and a steel pipe frame structure in which a leg that is a leg portion of the steel pipe frame frame is supported from below by a pile, and a leg of the steel pipe frame frame structure. And an arc wall made of a steel sheet pile or steel plate, which is supported from the sea side by a pile and performs earth retaining , and the arc wall is driven to a depth greater than or equal to a depth to prevent arc slip under the sea floor, and earth pressure and pressure is supported by its hoop tension leg before Symbol steel skeleton is, the reaction force of the hoop tension an anti earth pressure structure to receive a horizontal compressive force, the lower end and seafloor of the leg with coupling the pile which is pouring down to the bottom so that no step occurs, mounting the arc wall to the leg and該杭, the reaction force of the hoop tension of the arc wall so as to counter leg and pile And solved the problem That.

In the pile to which the arc wall is attached , the outer diameter of the portion driven into the bottom seabed is the same as the outer diameter of the leg to which the arc wall is attached , and the upper portion that is the portion that covers the leg. The outer diameter was widened to the lower part using a different-diameter pile (ring-shaped connecting member 61 (in the case of a steel pipe pile) as illustrated in FIG. 6) having a smaller diameter than the lower outer diameter driven into the seabed ground . Steel pipe pile 60 or tapered steel pipe pile 64 as illustrated in FIG.

Furthermore, the saddle plate for joining the said arc wall, a leg, and a pile can be provided.

  The saddle plate may be provided with a fixing guide for at least one of the leg or the pile, and the fixing guide for the saddle plate may be provided on at least one of the leg or the pile.

The present invention is also a saddle plate for joining the arc wall, the leg and the pile, and is provided with a fixing guide for fixing to at least one of the leg or the pile. A saddle plate for the body is provided.

The present invention also includes a steel pipe frame structure and a pile embedded in the seabed ground, and a steel pipe frame structure in which a leg that is a leg portion of the steel pipe frame is supported from below by the pile, and the steel pipe frame structure Is a method of constructing an anti-earth pressure structure having an arc wall made of steel sheet piles or steel plates that is supported from the sea side by legs and piles of steel, and the outer diameter of the portion driven into the bottom seabed is The outer diameter of the steel pipe frame leg is the same, and the outer diameter of the upper part, which is the part that covers the leg, is smaller than the outer diameter of the lower part that is driven into the seabed ground. And then, the pile is covered so that the leg is inserted, and then the remaining piles other than the different-diameter pile are driven, and a saddle plate is driven along the different-diameter pile and the leg, On both sides of the saddle plate, a straight steel arrow Or an arcuate steel plates pouring to a predetermined depth, to after casting, by performing mortar grout between the saddle plates and the of different diameters piles and leg, the compressive force by the hoop tension from the saddle plate leg and It can be transmitted to the pile.

  Further, as illustrated in FIGS. 9 and 10, the fixing guide 45 provided on the saddle plate 44 and the fixing guides 33 and 62 provided on at least one of the leg 32 or the pile 60. The two can also be joined together.

  According to the present invention, since the step between the lower end of the leg and the pile is not generated, the force that the arc wall (saddle plate) pushes to the sea side is applied to the leg of the steel pipe frame and the pile below the leg. Can communicate well.

  Also, in order to fix the steel pipe framework, the land-side pile is placed prior to the installation of the steel pipe framework, and then the steel pipe framework is installed, so that the submarine ground portion of the widened steel pipe pile or tapered steel pipe pile And the outer diameter of the land side leg of the steel pipe frame can be made the same. As a result, the saddle plate fixing guide attached in advance to the seabed ground portion of the widened steel pipe pile or tapered steel pipe pile and the saddle plate fixing guide attached in advance to the land side leg of the steel pipe frame are used. Can be reliably driven to a required depth, and by compressing the inside of the mortar grout, it is possible to transmit the compressive force due to the hoop tension from the saddle plate to the legs and piles.

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

  The first embodiment of the present invention uses a widened steel pipe pile 60 as shown in FIG. 6 as a pile for the land side leg 32. FIG. 8 is a vertical sectional view of the first embodiment, and FIG. 8 is a horizontal sectional view taken along the line IX-IX in FIG. 8, and FIG. 10 is a horizontal sectional view taken along the line XX in FIG. In the figure, 30 is a steel pipe frame, 32 is a land leg of the steel pipe frame 30, 34 is a sea side leg, 40 is an arc wall formed by a straight steel sheet pile 42, 44 is a straight steel sheet pile 42 and a steel pipe frame 30. A saddle plate for joining the land-side leg 32 of the present invention, 50 is a mortar grout that fills the gap between the saddle plate 44 and the land-side leg 32, and 60 is placed on the land side of the steel pipe frame 30. It is a widened steel pipe pile concerning an invention.

  As shown in FIG. 6, the widened steel pipe pile 60 has the same size as the outer diameter of the land-side leg 32 of the steel pipe frame 30 from the lower end rooted in the seabed ground to the part where the steel pipe frame 30 is placed. On the other hand, the outer diameter of the portion penetrating the inside of the land-side leg 32 is set to a diameter necessary for performing the mortar grout 52 for integration with the land-side leg 32. From the portion where the steel pipe frame 30 of the widened steel pipe pile 60 is mounted to the depth where the saddle plate 44 is installed, as shown in FIG. 11, an L-shaped fixing guide used when installing the saddle plate 44 62 is welded.

  Further, as shown in FIG. 10, an L-shaped fixing guide 33 is welded to the land-side leg 32 of the steel pipe frame 30 as well as the widened steel pipe pile 60.

  An L-shaped guide 45 is attached to the saddle plate 44 so as to engage with the L-shaped guides 62 and 33 attached to the widened steel pipe pile 60 and the land-side leg 32 of the steel pipe frame 30. After installation of the saddle plate 44, a mortar grout 50 is performed between the saddle plate 44, the widened steel pipe pile 60 and the land side leg 32 of the steel pipe frame 30, and the compressive force due to the hoop tension is transmitted from the saddle plate to the leg and pile. It can be so. As shown in FIG. 11, the horizontal cross-sectional shape of the saddle plate 44 is a shape along the arc of the arc wall 40 up to the portion A of the fixing guides 45, 62, 33 on which the mortar grout 50 is placed. This stress is prevented from occurring.

  Next, the construction procedure of the first embodiment will be described in detail.

  First, as shown in FIG. 12, a widened steel pipe pile 60 is driven to a predetermined position and depth as a land-side steel pipe pile. At this time, in order to manage the placement position of the pile, a template 70 provided with a widened steel pipe pile placement guide 72 shown in FIG.

  Next, as shown in FIG. 14, after placing a temporary receiving pile (such as an H-shaped pile) 80 of the steel pipe frame 30, the land-side leg 32 of the steel pipe frame 30 is attached to the widened steel pipe pile 60 with a floating crane 82 or the like. The steel pipe frame 30 and the piles are combined to form a steel pipe frame structure.

  Next, as shown in FIG. 15, a normal steel pipe pile 10 is placed in a steel pipe leg (in the figure, the sea side leg 34) other than the land side leg 32. Thereafter, mortar grout is performed so that the legs 32 and 34, the widened steel pipe pile 60, and the steel pipe pile 10 are not displaced, and these are completely integrated.

  Next, as shown in FIG. 16, the saddle plate 44 is struck along the L-shaped fixing guides 33 and 62 (see FIGS. 10 and 11) attached in advance to the land side leg 32 and the widened steel pipe pile 60. Set up.

  Next, as shown in FIG. 17, the straight steel sheet pile 42 or the arc-shaped steel plate is driven to a required depth so as to form a predetermined arc shape on both sides of the saddle plate 44. After the placement, a mortar grout is performed between the saddle plate 44 and the widened steel pipe pile 60 and the land side leg 32 of the steel pipe frame 30 so that the compressive force by the hoop tension can be transmitted from the saddle plate to the leg and the pile.

  The subsequent construction procedure is the same as that of the conventional jacket method, and is completed by landfilling of the back ground, construction of the upper floor slab, paving, and the like.

  Next, instead of the widened steel pipe pile 60, a second embodiment of the present invention using the tapered steel pipe pile 64 shown in FIG. 7 is shown in FIG.

  This structure is essentially the same as when widened steel pipe piles are used, and the most advantageous one is selected from the viewpoint of manufacturability and placement efficiency of steel pipe piles.

  In the above-described embodiment, the saddle plate 44, the leg 32, and the steel pipe pile 60 are fixed using the L-shaped fixing guides 45, 33, 62. However, the shape and type of the fixing guide are not limited thereto. Of course, it is also possible to use an LT joint or a PP joint (pipe-pipe joint) used as a joint for steel pipe piles. Also, a part of the fixing guide can be omitted.

  Moreover, in the said embodiment, although the arc wall 40 is installed in the land side, it can also be installed in the sea side. Moreover, a leg is not limited to 2 rows, You may arrange | position 3 or more rows as needed. Furthermore, the arc shape is not limited to a complete arc.

Sectional view showing an example of a conventional jetty structure Sectional view showing an example of a conventional sheet pile structure Sectional view showing an example of a conventional jacket type structure Horizontal sectional view showing the configuration proposed in Patent Document 1 Sectional drawing for demonstrating the trouble of a prior art example Sectional drawing which shows the example of the widened steel pipe pile used by this invention Sectional drawing showing an example of a steel pipe pile with a taper Sectional drawing of 1st Embodiment of this invention Horizontal sectional view along line IX-IX in FIG. Horizontal sectional view along line XX in FIG. Horizontal cross section showing saddle plate shape Sectional drawing which shows the first procedure in the construction procedure of 1st Embodiment Perspective view showing examples of templates used during construction Sectional drawing which shows the procedure following FIG. 12 in the construction procedure of 1st Embodiment. Sectional drawing which shows the procedure following FIG. 14 Sectional drawing which shows the procedure which follows FIG. 15 similarly Sectional drawing which shows the procedure which follows FIG. 16 similarly Sectional drawing which shows 2nd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Steel pipe pile 30 ... Steel pipe frame 32 ... Land side leg 33, 45, 62 ... Fixing guide 34 ... Sea side leg 40 ... Arc wall 42 ... Linear steel sheet pile 44 ... Saddle plate 50, 52 ... Mortar grout 60 ... Widening steel pipe Pile 64 ... Tapered steel pipe pile S ... Step

Claims (11)

A steel pipe frame structure and a pile rooted in the seabed ground, and a leg structure that is a leg portion of the steel pipe frame structure supported from below by the pile, and the leg and pile of the steel pipe frame structure It has an arc wall made of steel sheet pile or steel plate that is supported from the side and performs earth retaining ,
The arc wall is Da設than a depth to prevent the arc sliding under the seafloor, and supports the earth pressure and water pressure by its hoop tension,
Before Symbol leg of the steel pipe scaffold is, an anti-soil pressure structure to receive a reaction force of the hoop tension as a horizontal compressive force,
With coupling the pile which is pouring to the lower end and the sea bottom under the leg so that no step occurs, the arc wall attached to the leg and該杭, leg reaction force of the hoop tension of the arc wall And anti-earth pressure structure characterized by being able to compete with piles. The pile where the arc wall is attached is the same as the outer diameter of the leg having an outer diameter the arc wall is attached portion driven into the seabed of the lower and upper of a part that suffers the leg The anti-earthquake structure according to claim 1, wherein the outer diameter is a different-diameter pile having a smaller diameter than the outer diameter of the lower portion driven into the seabed ground .   The anti-earth pressure structure according to claim 2, wherein the piles with different diameters are piles or taper piles widened in the lower part. Of the outer peripheral surface of the leg and the pile, or the outer peripheral surface of the pile, at least a portion that receives a reaction force of the hoop tension is covered with a material capable of transmitting a compressive force due to the hoop tension to the leg and the pile, The anti-earth pressure structure according to claim 1, wherein no step is generated between the leg and the pile . The anti-earth pressure structure according to any one of claims 1 to 4, further comprising a saddle plate for joining the arc wall, a leg, and a pile. 6. The anti-earth pressure structure according to claim 5, wherein a space between the leg and the pile and the saddle plate is filled with a material capable of transmitting a compressive force by the hoop tension from the saddle plate to the leg and the pile. body. Anti earth pressure structure according to claim 4 or 6, wherein the pre-SL materials is a mortar. The fixing plate for the saddle plate is provided on at least one of the leg or the pile, and the fixing guide for the saddle plate is provided on at least one of the leg or the pile. Or the anti-earth pressure structure of 6. A saddle plate for joining the arc wall, leg and pile of the anti-earth pressure structure according to any one of claims 1 to 4,
A saddle plate for an anti-earth pressure structure, comprising a guide for fixing with at least one of the leg and the pile. A steel pipe frame structure and a pile rooted in the seabed ground, and a leg structure that is a leg portion of the steel pipe frame structure supported from below by the pile, and the leg and pile of the steel pipe frame structure A method of constructing an anti-earth pressure structure having an arc wall made of a steel sheet pile or steel plate, which is supported from the side and performs earth retaining ,
The outer diameter of the portion that is driven into the lower seabed ground is the same as the outer diameter of the leg of the steel pipe framework, and the outer diameter of the upper part that is the part that covers the leg is larger than the outer diameter of the lower part that is driven into the seabed ground Placing a small pile of different diameters in contact with the saddle plate,
Cover the stake to insert the leg, then
Placing the remaining piles that are not different diameter piles ,
Saddle plate is placed along the different diameter pile and leg,
On both sides of the saddle plate, a straight steel sheet pile or an arc-shaped steel plate is driven to a predetermined depth so as to have a predetermined arc shape,
Characterized in after casting, by performing mortar grout between the saddle plates and the of different diameters piles and legs, to a compressive force by hoop tension from the saddle plate can be transmitted to the legs and pile The construction method of the anti earth pressure structure. The constant wear guide is provided on the saddle plate, anti-soil pressure of claim 10, the constant wear guides provided on at least one leg or pile, characterized by joining overlapping both fixing guide How to build a structure.

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