JP2006249745A - Horizontal sheet pile for cutting of tunnel excavator and earth retaining wall using this sheet pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal sheet pile for cutting of a tunnel excavator for easily passing an earth retaining wall by cutting by a cutter bit of the tunnel excavator. <P>SOLUTION: The horizontal sheet pile 11 for cutting is installed between support columns when excavating so as to expose a side surface of the support column (a cutting support column 12, and H shape steel 13) driven at an interval in the ground. The horizontal sheet pile 11 for cutting is formed of a material cuttable by the cutter bit of the tunnel excavator 4, and is fixed to the support columns 12 and 13 by a connecting means (a bolt part 18, and a welding part 20). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a horizontal sheet pile for cutting a tunnel excavator used when starting or reaching a tunnel excavator from a shaft constructed by supporting an excavated natural ground with a retaining wall, and soil using the same. It is about a retaining wall.

  Conventionally, when the earth retaining wall 1 is constructed by excavating the natural ground 8, as shown in FIG. 7, the side surfaces of the H-shaped steels 3, 3 are excavated as parent piles that are previously placed in the ground at intervals. The square steel pipes 2,... Are stacked between the H-shaped steels 3 and 3, and the earth retaining is performed.

  On the other hand, as shown in FIG. 8, the tunnel excavator 4 that excavates the natural ground 8 and constructs a tunnel is started from the shaft 5 constructed by being surrounded by the retaining wall 1.

  The earth retaining wall 1 is supported by cut beams 6 and 6 laid in multiple stages, and a reaction force girder 7a and a reaction force member 7b are installed on the bottom slab concrete 9 constructed on the bottom surface of the shaft 5. .

  Then, the H-shaped steel 3 and the square steel pipe 2 of the removal portion 1a of the retaining wall 1 through which the tunnel excavator 4 passes are removed to expose the natural ground 8, and the reaction force is taken from the reaction force material 7b to take the tunnel excavator. Push 4 into the ground.

In Patent Document 1, a long steel sheet pile continuous in the vertical direction is placed in the ground to construct a retaining wall, and in the part through which the tunnel excavator 4 passes, a hard urethane is placed on the front surface of the steel sheet pile. Placing a wall material formed of a material that can be easily cut such as resin, and when passing through the tunnel excavator 4, the steel sheet pile is pulled out and only the wall material is cut and passed. A method is disclosed.
JP 2003-214086 A

  However, when removing the H-shaped steel 3 and the square steel pipe 2 of the removal portion 1a, the ground 8 on the back surface of the removal portion 1a is exposed over a wide range, and an unstable state is temporarily generated.

  Moreover, the work of removing the H-shaped steel 3, the square steel pipe 2, the steel sheet pile, etc. must be performed separately from the excavation of the tunnel excavator 4, which causes the construction period and cost to increase, and these members If it is deformed by earth pressure, it may not be removed easily.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a horizontal sheet pile for cutting a tunnel excavator that can be easily passed by cutting with a cutter bit of a tunnel excavator and a retaining wall using the same. It is said.

  In order to achieve the above-mentioned object, the present invention is a cross-sheet pile installed between support columns when excavation is performed so that the side surfaces of the support columns placed in the ground at an interval are exposed. The transverse sheet pile is formed of a material that can be cut by a cutter bit of a tunnel excavator, and is a transverse sheet pile for cutting a tunnel excavator fixed to the support column by a connecting means.

  Here, the said lateral sheet pile can be made into the composite material of the plate shape, the polygonal column shape, or the column shape which reinforced the plastic foam with the inorganic fiber.

  Furthermore, the end portion of the horizontal sheet pile can be formed thinner than the central portion.

  And the reinforcement part which fixes this volt | bolt can be provided in the edge part of the said horizontal sheet pile inserted when using a volt | bolt as the said connection means.

  The composite material can be formed by reinforcing a plastic foam made of a hard urethane resin with long glass fibers.

  Furthermore, the earth retaining wall can be constructed by using any of the above-mentioned cross sheet piles for cutting a tunnel excavator as a part or all of the wall material.

  In the present invention configured as described above, the horizontal sheet pile is fixed to the support column by the connecting means, and the horizontal sheet pile formed of a material that can be cut by the cutter bit of the tunnel excavator is directly cut by the tunnel excavator. be able to.

  For this reason, a tunnel excavator can easily pass through the earth retaining wall constructed by the horizontal sheet pile.

  In addition, a composite material in which a plastic foam is reinforced with inorganic fibers, especially a lightweight material with excellent bending strength and compressive strength by using a material formed by reinforcing a plastic foam made of hard urethane resin with long glass fibers. This makes it possible to produce a cuttable sheet pile at a relatively low cost.

  Further, by reducing the thickness of the end portion where the generated bending stress is smaller than that of the central portion, the material cost can be saved. In addition, when using a bolt as a connecting means, the length of the bolt is reduced. Can be shortened.

  If the length of the bolt is short, the operation of the tunnel excavator is not hindered even if the bolt is not formed of a material that can be cut.

  Moreover, by providing a reinforcing portion at the end of the horizontal sheet pile to fix the bolt and strengthening it, the tightening force of the bolt can be dispersed and damage to the horizontal sheet pile can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  The front view which looked at the retaining wall 10 which has arrange | positioned the horizontal sheet pile 11 for cutting as a horizontal sheet pile for tunnel excavator cutting of this Embodiment in the vertical shaft was shown in FIG.

  This earth retaining wall 10 is provided with cutting sheet piles 11,... In a range that hangs inside the cutting outer shape 4 a through which the tunnel excavator 4 passes, and the other portions are general sheet pile portions 15 such as square steel pipes. Composed.

  This horizontal sheet pile 11 for cutting and the general sheet pile part 15 are supported by the support pillar laid in the ground at intervals. As shown in FIG. 1, the support pillar is formed by a cutting support pillar 12 at a portion that is cut inside the cutting outer shape 4 a, and the other portion that is not cut is formed by an H-shaped steel 13.

  The cutting transverse sheet pile 11 and the cutting support pillar 12 described above are portions formed of a material that can be cut by a cutter bit of the tunnel excavator 4, and are formed of, for example, a composite material in which a plastic foam is reinforced with inorganic fibers. Is done.

  For this composite material, for example, a material obtained by reinforcing a plastic foam made of a hard urethane resin with long glass fibers as inorganic fibers is used. Examples of such a material include Eslon Neo Lumber FFU (manufactured by Sekisui Chemical Co., Ltd.).

  For example, as shown in FIG. 3, the cutting sheet pile 11 is made of two composite materials having different lengths formed into a plate shape by using an epoxy resin adhesive, a urethane resin adhesive, an acrylic resin adhesive, or the like. It is formed by joining with a resin adhesive.

  By stacking plate materials having different lengths in this way, it is possible to easily reduce the end portion 11a of the cutting sheet pile 11 and increase the central portion 11b.

  Further, the cutting support pillar 12 is formed into a prismatic shape as shown in FIGS. 1 and 2 (cross-sectional view taken along line AA in FIG. 1) by bonding the plate-shaped composite material with the resin adhesive. In addition, joint portions 14 and 14 for connection with the H-shaped steel 13 are provided at both ends in the longitudinal direction.

  A soil cement portion 16 obtained by stirring and mixing the ground and cement is formed in a continuous columnar shape as shown in FIG.

  Moreover, since the natural ground 8 between the support columns is exposed after the excavation until the cutting sheet pile 11 or the general sheet pile portion 15 is arranged, the ground improvement method such as cement jet agitation is used. The ground improvement part 17 is constructed so that it can temporarily stand on its own.

  3 shows a cross-sectional view (FIG. 3A) when both ends of the cutting sheet pile 11 shown in the left part of FIG. 1 are fixed to the cutting support columns 12 and 12, and the excavation side. The front view (FIG.3 (b)) seen from (BB arrow direction of Fig.3 (a)) was shown.

  Here, a bolt portion 18 is used as a connecting means, and a reinforcing layer 19 as a reinforcing portion is provided on the surface on the excavation side of the end portion 11a of the cutting sheet pile 11 for fixing one end of the bolt portion 18. Yes.

  As the reinforcing layer 19, for example, an FRP material in which a resin such as a polyester resin or an epoxy resin is reinforced with a fiber material such as a mat or cloth can be used. As the fiber material, glass fiber, carbon fiber, aramid fiber, or the like is used. The

  An example of a specific configuration of the bolt portion 18 is shown in FIG.

  Here, a bolt hole 18b in which a thread groove is preliminarily formed is provided in the cutting support column 12, and the bolt 18a made of the FRP material is screwed into the bolt hole 18b to cut the end portion 11a of the cutting sheet pile 11. It is fixed to the support pillar 12 for use.

  As a specific configuration of the other bolt portion 18, in FIG. 5, an adhesive 18e is injected into a hole provided in the cutting support column 12, and one end of a dimensioned bolt 18c obtained by forming the FRP material into a rod shape is bonded. The configuration is shown in which it is fixed with the agent 18e and the nut 18d is screwed into the other end to fix the end 11a to the cutting support column 12.

  6 is a cross-sectional view when one end of a cutting sheet pile 11 as shown in the right part of FIG. 1 is fixed to a cutting support column 12 and the other end is fixed to an H-shaped steel 13 (FIG. 6). 6 (a)) and a front view (FIG. 6 (b)) viewed from the excavation side (CC arrow direction of FIG. 6 (a)).

  Here, the bolt portion 18 described above is used to fix the cutting support column 12 and the cutting cross-sheet pile 11, and a welding portion 20 is provided as a connecting means for fixing to the H-shaped steel 13.

  For example, as shown in FIG. 6 (a), the welded portion 20 has an iron plate 20a attached to the end surface of the cutting sheet pile 11 with the resin-based adhesive, and a flange plate of the H-shaped steel 13 and the iron plate 20a. It is formed by interposing an iron square bar 20b in the gap and welding between the iron square bar 20b and the flange plate and between the iron plate 20a and the iron square bar 20b.

  Next, the construction method of the retaining wall 10 will be described.

  First, as shown in FIG. 2, a predetermined number of soil cement portions 16,... In which the ground is stirred in a cylindrical shape while cement milk is injected are constructed. Then, before the soil cement is hardened, the support column in which the H-shaped steel 13 and the cutting support column 12 are connected via the joint portion 14 and the H-shaped steel 13 are inserted into the soil cement portions 16,.

  In addition, the ground 8 exposed to the excavation side as the excavation surface is subjected to a ground improvement method in which cement milk is jetted to improve the ground 8 so that a cylindrical ground improvement portion 17 as shown in FIG.・ ・ Build.

  Then, excavation such that the side surface of the H-shaped steel 13 is exposed is performed to such a depth that the ground on the back side can stably stand on its own, and the general sheet pile portion 15 is bridged between the H-shaped steels 13 and 13 to perform earth retaining. . This excavation and earth retaining by the arrangement of the general sheet pile portion 15 are repeated until just before reaching the depth at which the tunnel excavator 4 is started.

  On the other hand, a crossing sheet pile 11 for cutting is installed in a range of the cutting outer shape 4a cut by the tunnel excavator 4. Also in this case, excavation that exposes the side surfaces of the support pillars 12 for cutting or the H-shaped steel 13 is carried out to such a depth that the ground on the back side can stably stand on its own, and the crossing sheet piles 11 for cutting are bridged over the bolt portion. The earth retaining is performed by fixing to the cutting support pillar 12 or the H-shaped steel 13 by 18 or the welded portion 20.

  As shown in FIG. 1, the horizontal sheet pile 11 for cutting is laminated until reaching a predetermined depth, and the general sheet pile portion 15 is disposed again from a position outside the cutting outer shape 4 a.

  Next, the operation of the cutting sheet pile 11 of the present embodiment will be described.

  If the retaining wall 10 is constructed with the cutting sheet piles 11 in this way, the tunnel excavator 4 can be directly passed without removing the retaining wall 10, so that the tunnel excavation can be performed safely and easily. The machine 4 can start from the shaft or reach the shaft.

  In particular, by using a material formed by reinforcing a plastic foam made of hard urethane resin with long glass fibers, a lightweight, cuttable sheet pile with excellent bending strength and compressive strength can be manufactured at a relatively low cost. be able to.

  Furthermore, the material cost can be rationally saved by making the end portion 11a, which has a bending moment that acts structurally near the fulcrum smaller than the central portion 11b, thinner than the central portion 11b.

  Moreover, when using the bolt part 18 as a connection means like this Embodiment, since the length of a volt | bolt can be shortened by the part which the edge part 11a became thin, material cost can be reduced.

  Further, even when the bolt portion 18 is made of a steel bolt that can be obtained at low cost, if the steel bolt is short, the steel bolt taken into the tunnel excavator 4 can be used as a gravel outlet (see FIG. Since it can be removed from the tunnel excavator 4, the passage and subsequent excavation are not hindered.

  Further, by covering and reinforcing the surface of the end portion 11a for fixing the bolt portion 18 with the reinforcing layer 19, the tightening force of the bolt portion 18 is dispersed and damage to the end portion 11a of the cutting sheet pile 11 is prevented. I can do it.

  Furthermore, if the end portion 11 a of the cutting sheet pile 11 is firmly connected to the cutting support column 12 or the H-shaped steel 13, the portion of the cutting sheet pile 11 that remains should be left even when cutting by the tunnel excavator 4. Generation | occurrence | production of the situation where it comes off and mixes in excavation earth and sand without being fully crushed can be prevented.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment, the case where the crossing sheet pile 11 for cutting is installed between the cutting struts 12 and 12 or between the cutting strut 12 and the H-shaped steel 13 is described, but the present invention is not limited to this. Alternatively, only the cutting sheet pile 11 may be cut between the H-shaped steels 13 and 13.

  Moreover, in the said embodiment, in order to change the thickness of the cutting sheet pile 11 by the edge part 11a and the center part 11b, it bonded together and used the 2 sheet-like composite material, However, It is not limited to this Alternatively, it can be integrally molded so that the thickness of the end portion 11a is thinner than the thickness of the central portion 11b.

  Furthermore, in the said embodiment, although the sheet-like cutting sheet pile 11 for cutting was used, it is not limited to this, You may use what was shape | molded into polygonal column shapes, such as a square pole and a hexagonal column, and a column shape. it can.

  In the above embodiment, the reinforcing layer 19 is provided as the reinforcing part. However, the present invention is not limited to this, and the reinforcing part 19 can be reinforced by reinforcing the periphery of the hole into which the bolts 18a and 18c are inserted.

It is a front view explaining the structure of the earth retaining wall which erected the cutting sheet pile of the best embodiment of this invention. It is the sectional view on the AA line of FIG. 1 explaining the structure of the earth retaining wall which laid the cross sheet pile for cutting. (A) is sectional drawing explaining the structure of the horizontal sheet pile for cutting which fixed the both ends to the support pillar for cutting, (b) is a BB arrow line view of (a). It is an expanded sectional view explaining the specific structure of the connection means of the edge part of a cutting sheet pile, and the support column for cutting. It is an expanded sectional view explaining the other specific structure of the connection means of the edge part of a cutting sheet pile, and the support column for cutting. (A) is sectional drawing explaining the structure of the horizontal sheet pile for cutting which fixed the edge part to the support pillar for cutting, and H-shaped steel, (b) is CC arrow directional view of (a). It is a perspective view explaining the earth retaining wall constructed | assembled with the conventional square steel pipe. It is sectional drawing explaining the vertical shaft from which the conventional tunnel excavator starts.

Explanation of symbols

10 Earth retaining wall 11 Cutting sheet pile (Yoko sheet pile)
11a End 11b Center 12 Cutting support pillar (support pillar)
13 H steel (support column)
18 Bolt part (connecting means)
18a Bolt 18c Dimensional bolt (Bolt)
18d Nut 19 Reinforcement layer (reinforcement part)
20 Welded part (connecting means)

Claims (6)

  A horizontal sheet pile constructed between the support pillars when excavation is performed such that the side surfaces of the support pillars placed at intervals in the ground are exposed, the horizontal sheet piles being a cutter of a tunnel excavator A horizontal sheet pile for cutting a tunnel excavator, which is formed of a material that can be cut by a bit and is fixed to the support column by a connecting means.   The transverse sheet pile for cutting a tunnel excavator according to claim 1, wherein the transverse sheet pile is a plate-like or columnar composite material in which a plastic foam is reinforced with inorganic fibers.   The side sheet pile for cutting a tunnel excavator according to claim 1 or 2, wherein an end portion of the side sheet pile is formed thinner than a center portion.   The tunnel excavation according to any one of claims 1 to 3, wherein a reinforcing portion for fixing the bolt is provided at an end portion of the lateral sheet pile to be inserted when the bolt is used as the connecting means. Horizontal sheet pile for machine cutting.   5. The horizontal sheet pile for cutting a tunnel excavator according to claim 2, wherein the composite material is formed by reinforcing a plastic foam made of a hard urethane resin with a long glass fiber. A retaining wall, characterized in that the transverse sheet pile for cutting a tunnel excavator according to any one of claims 1 to 5 is used for a part or all of a wall material.

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