JP2007308896A - Anti-earth pressure structure, saddle plate thereof, and method of constructing anti-earth pressure structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-earth pressure structure which positively transmits a pressing force for pressing an arc wall toward the sea to legs of a steel pipe skeleton structure and piles under the legs. <P>SOLUTION: The anti-earth pressure structure has the steel pipe skeleton structure composed of a steel pipe skeleton 30 and the piles (10, 60 and 64) for bearing the same, and an earth retaining wall. The earth retaining wall is driven to a depth that can prevent arched sliding under the sea bottom or deeper, and bears earth pressure and water pressure as the hoop tension of the arc wall body (40). Each leg 32 of the steel pipe skeleton 30 subjected to a reaction of the hoop tension bears the reaction as a horizontal compressive force. In this structure, the anti-earth pressure structure is constituted so that no step S is formed between the lower edge of each leg 32 and each pile (10, 60 and 64) driven to the depth under the sea bottom, and therefore the legs 32 and the piles (10, 60 and 64) can withstand the reaction of the hoop tension. <P>COPYRIGHT: (C)2008,JPO&INPIT

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, when conditions such as a deep water region, soft ground, rapid construction, etc. are required, as shown in FIG. 3, for example, a steel pipe frame structure (jacket structure) in which the steel pipe frame 30 shown in FIG. Also 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. For these reasons, 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 has a steel pipe frame structure in which a steel pipe frame is supported by a pile and a retaining wall, and the retaining wall is placed more than a depth to prevent arc slip under the sea floor, and earth pressure and water pressure are arc-shaped. The leg of the steel pipe frame supported as a hoop tension of the wall body and receiving the reaction force of the hoop tension is an anti-earth pressure structure configured to receive the reaction force as a horizontal compressive force. The above problem is solved by preventing a step from being generated between piles driven to the bottom and allowing the reaction force of the hoop tension to be countered by the legs and the piles.

  The outer diameter of the portion of the pile that is driven into the bottom seabed is the same as the outer diameter of the leg, and the outer diameter of the portion in the upper leg is a small diameter that can cover the leg. Piles (steel pipe pile 60 widened at the bottom using ring-shaped connecting member 61 (in the case of a steel pipe pile) as illustrated in FIG. 6 or tapered steel pipe pile 64 as illustrated in FIG. 7) and the like can do.

  Furthermore, the saddle plate for joining the said retaining 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 earth retaining wall, the leg and the pile, and is provided with a fixing guide to at least one of the leg or the pile. A saddle plate for the body is provided.

  The present invention is also a method of constructing an anti-earth pressure structure combining a steel pipe frame structure in which a steel pipe frame is supported by a pile and a retaining wall, and an outer diameter of a portion driven into a lower seabed ground is that of the steel pipe frame. It is the same as the outer diameter of the leg, and the outer diameter of the part in the upper leg has a small diameter so that the leg can be covered, and a pile with a different diameter in contact with the saddle plate is placed, Cover the legs so as to insert them, place the remaining piles, place saddle plates along the different diameter piles and legs, and straight steel sheet piles to form a predetermined arc on both sides of the saddle plates Alternatively, an arc-shaped steel plate is cast to a predetermined depth, and after the placement, a mortar grout is performed between the saddle plate and the different-diameter pile and leg, and the compression force due to the hoop tension is transmitted from the saddle plate to the leg and pile. It is intended to be able to

  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 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 placed 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 is used. 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 the widened steel pipe pile placement guide 72 shown in FIG. 13 can be installed in advance as needed.

  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 the back ground, construction of the upper floor slab, and paving.

  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)

It has a steel pipe frame structure and a retaining wall that supports the steel pipe frame with piles,
The retaining wall is placed more than the depth to prevent arc slip under the sea floor, and supports earth pressure and water pressure as hoop tension of the arc-shaped wall body,
The leg of the steel pipe frame that receives the reaction force of the hoop tension is an anti-earth pressure structure that receives the reaction force as a horizontal compression force.
An anti-earth pressure structure characterized in that a step does not occur between the lower end of the leg and a pile driven to the bottom of the sea surface so that the reaction force of the hoop tension can be countered by the leg and the pile. body.   The outer diameter of the portion of the pile that is driven into the bottom seabed is the same as the outer diameter of the leg, and the outer diameter of the portion in the upper leg is a small diameter that can cover the leg. The anti-earth pressure structure according to claim 1, wherein the structure is a pile of   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.   The anti-earthquake structure according to claim 1, wherein a step between the lower end of the leg and a pile driven to the bottom of the seabed is filled with a material having rigidity.   The anti-earth pressure structure according to any one of claims 1 to 4, further comprising a saddle plate for joining the earth retaining wall, a leg and a pile.   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 rigid material.   The anti-earth pressure structure according to claim 4 or 6, wherein the material having rigidity is mortar grout.   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. The anti-earth pressure structure according to any one of 7 to 7. A saddle plate for joining a retaining wall, a leg and a 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 fixing guide with at least one of the leg or the pile. A method of constructing an anti-earth pressure structure combining a steel pipe frame structure with a steel pipe frame supported by a pile and a retaining wall,
The outer diameter of the portion to be driven into the lower seabed ground is the same as the outer diameter of the leg of the steel pipe frame, and the outer diameter of the portion in the upper leg has a small diameter so that the leg can be covered, and the saddle Pile different diameter piles in contact with the plate,
Put the leg on the stake to insert it,
Laying the remaining 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,
After placing, the mortar grout is performed between the saddle plate and the piles and legs of different diameter so that the compressive force by the hoop tension can be transmitted from the saddle plate to the legs and piles. Pressure structure construction method.   The fixing guide provided on the saddle plate according to claim 8 or 9 and the fixing guide provided on at least one of the leg or the pile are overlapped, and both are joined. Construction method of anti-earth pressure structure.

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