JP2006112065A - Element pipe, bulkhead, and construction method for bulkhead - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an element pipe which reduces structural waste, and which enables a bent section of a bulkhead to be easily formed. <P>SOLUTION: The element pipe 6 as a tubular body is arranged in each hole excavated along a position of the bulkhead by an excavator in the formation of the bulkhead 10 in the ground, and the bulkhead 10 is formed by connecting the adjacent element pipes 6 to each other. The tubular body is formed in such a shape as to have an almost trapezoidal cross section with opposed sides equipped with first and second inclined planes; an outward opened groove part 6 with a recess-shaped cross section is formed in the first inclined plane; and a pair of engaging brackets 6c and 6c is formed on the second inclined plane in an outward protruding shape at an interval almost equal in dimension to the width of the groove part 6a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes a plurality of element pipes that are arranged in the ground to form a bulkhead, a bulkhead such as a tunnel lining constructed using the element pipe, and a part of the tunnel is widened or provided side by side. The present invention relates to a method for constructing a partition wall that forms a junction / branch between tunnels.

  Conventionally, as shown in the sectional view of FIG. 12, there is known a method of constructing a partition wall 3 by arranging a plurality of circular or partially circular element tubes 2,... Without cutting the underground 1 to the ground. (See Patent Document 1).

  In this method, first, the first element pipe 2 is pushed and arranged from behind the excavation hole excavated circularly by the excavator. Further, next to the element pipe 2 arranged in advance, another element pipe 2 is propelled while using it as a guide, and by repeating this operation, the element pipes 2,... Are arranged one after another. To go.

  Then, after a closed section having a substantially elliptical shape in section as shown in FIG. 12 is formed by the plurality of element tubes 2,..., A part of the side surface where the element tubes 2,. By inserting a steel material in the elliptical circumferential direction and placing concrete, a partition wall 3 in which adjacent element tubes 2,... Are integrated is constructed.

  The inside surrounded by the partition wall 3 is excavated to form a large-section tunnel having the partition wall 3 as a tunnel peripheral wall, and is used for a road or a common groove.

On the other hand, there is also known a method of forming an outline of a large-section tunnel by connecting a plurality of element tubes having four-corner cross-sectional squares (see Patent Document 2).
JP 2000-310100 A (FIG. 13, paragraphs 0002 to 0003) JP 2000-120373 A (FIG. 3)

  However, when the partition 3 is constructed by connecting small circular sections as described above, the effective thickness sandwiched between two-dot chain lines in FIG. There are only 4 parts.

  As described above, the circular cross section has an advantage that the excavation surface is stabilized when excavating each small cross section due to the arch effect, but a portion having a curvature which is not included in the effective thickness 4 is unnecessary in the structural calculation. It is treated as a part, and it is not economical because it has built a surplus part or surplus part.

  Further, the thickness of the effective thickness 4 can be increased if the adjacent element tubes 2 and 2 are brought close to each other and the overlapping portion is enlarged, but if the wrap portion is enlarged, a partition wall having the same circumference is constructed. Therefore, the number of element pipes 2,... Used increases, so that the material cost increases and the number of times of excavating the excavator increases, which causes an increase in construction cost and construction period.

  In addition, when a rectangular element tube is used, there is no problem when a flat partition wall is formed. However, when a partition wall having a bent portion such as an ellipse is constructed, there is a gap between the element tube and the element tube. Because of this, the element tube is easy to move left and right during propulsion, and it is difficult to place the element tube at a predetermined position.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an element tube that can be easily formed with a bent portion of a partition wall with little structural waste, a partition wall constructed using the element tube, and a partition wall construction method. It is said.

  In order to achieve the above object, according to the first aspect of the present invention, when a partition wall is formed in the ground, it is arranged for each excavation hole by an excavator along the partition position and connects adjacent ones to each other. An element tube of a cylindrical body forming the partition, wherein the cylindrical body is formed in a substantially trapezoidal cross section having a first inclined surface and a second inclined surface on opposite sides, and is a concave shape that opens outward on the first inclined surface. A groove portion having a cross section is formed, and the element tube is formed by protruding a pair of engagement brackets outwardly at an interval substantially equal to the width of the groove portion on the second inclined surface.

  In addition, according to a second aspect of the present invention, in the element tube according to the first aspect, the first inclined surface and the second inclined surface are formed symmetrically with respect to a center line therebetween. And

  Further, according to a third aspect of the present invention, there is provided a water stop portion forming material in at least one of an inner space formed by the outer shell forming the cylindrical body and the groove portion or an inner space formed by the engagement bracket. The element tube according to claim 1 or 2, wherein a hollow portion for injection is formed.

  When the partition wall is formed in the ground, it is arranged for each excavation hole by the excavator along the partition position, and the adjacent ones are connected to each other to form the partition wall. An element tube of a cylindrical body, wherein the cylindrical body is formed in a substantially trapezoidal cross section having a first inclined surface and a second inclined surface on opposite sides, and the guide groove portion having a concave cross section that opens to the outside on the first inclined surface The element tube is characterized in that a protruding portion having a shape that can be inserted into the guide groove portion protrudes outward from the second inclined surface.

  According to a fifth aspect of the present invention, a plurality of element pipes according to any one of the first to fourth aspects are connected in the ground, and the stress members are arranged by communicating the inside of the element pipes in the connecting direction. In addition, the element tube is filled with a cement-type solidifying material and integrated.

  Furthermore, the invention described in claim 6 is a method for constructing a partition wall formed by arranging a plurality of element pipes according to any one of claims 1 to 3 in the ground, and excavating a tunnel, A starting base that spreads in the direction perpendicular to the tunnel axis by digging the surroundings from the inside of the tunnel is constructed, and the reaching base is located at a position away from the starting base along the tunnel by a predetermined length in the same manner as the starting base. Build and excavate underground from the starting base to the destination base with an excavator, place the element pipe in its excavation hole, and again move the excavator along the groove of the element pipe arranged in advance An excavation hole adjacent to the preceding element pipe is formed, and the engagement bracket of the other element pipe is engaged with the groove, and the other element pipe is arranged. Next, a partition wall in which a plurality of the element pipes are connected around the tunnel is constructed by repeating the step of arranging the groove portion and the engaging bracket while engaging the adjacent element pipes, and the starting base And a construction method of a bulkhead for excavating the underground between the tunnel and the bulkhead between the arrival bases.

  According to the first aspect of the present invention, the pair of engagements of the other element tube disposed adjacent to the groove portion formed in one of the element tubes formed in a substantially trapezoidal cross section. Engage and connect the brackets.

  For this reason, it is possible to easily form the bent portion of the partition wall simply by matching the inclined surfaces of the adjacent element pipes, and there is almost no gap between the adjacent element pipes. .

  In addition, since the element tube has a substantially trapezoidal cross section, there are almost no structurally useless portions.

  Furthermore, since the element tube can be arranged while the engagement bracket is engaged with the groove portion, the element tubes can be connected without relatively rotating (rolling). Moreover, since it can connect only by engaging surfaces, the restriction | limiting of a connection direction is loose and can respond easily to the construction of a curve part, and a construction error.

  According to a second aspect of the present invention, the first inclined surface and the second inclined surface, which are side surfaces of a substantially trapezoidal cross section, are formed symmetrically with respect to the center line therebetween.

  For this reason, when the element tubes having the same shape are adjacent to each other, the lengths of the inclined surfaces facing each other are equal, and no step is generated when the element tubes are connected. Further, the bent portions of the partition walls can be easily formed at the same angle simply by matching the inclined surfaces.

  Furthermore, the planar partition can be easily formed by disposing the element tubes in the directions that are alternately inverted.

  Moreover, the thing of Claim 3 has previously formed the hollow part for inject | pouring the said water stop part forming material.

  For this reason, the said water stop part forming material can be easily inject | poured, and a water stop part can be rapidly formed in the outer side of an element pipe | tube. Furthermore, since the water stoppage can be improved, the partition wall can be safely constructed even in a place where the earth pressure and the water pressure are large, such as deep underground.

  Furthermore, in the invention described in claim 4, the protrusion of the other element tube disposed adjacent to the guide groove formed in one of the element tubes formed in a substantially trapezoidal cross section is inserted and connected. .

  For this reason, it is possible to easily form the bent portion of the partition wall simply by matching the inclined surfaces of the adjacent element pipes, and there is almost no gap between the adjacent element pipes. .

  In addition, since the element tube has a substantially trapezoidal cross section, there are almost no structurally useless portions.

  Further, the invention according to claim 5 is to construct a partition wall in which any one of the element pipes described above is connected in the ground, and the inside is connected after the connection so that the stress member and the cement-based solidifying material are integrated. To do.

  If the earth and sand inside the partition thus constructed is excavated, the partition becomes a tunnel lining, and if the partition is provided on the outer periphery of the tunnel, an enlarged portion of the tunnel can be constructed.

  In addition, if a starting shaft and a reaching shaft are constructed from the ground, and the partition is constructed between the starting shaft and the reaching shaft, an outer shell structure such as a subway station building or an underground parking lot can be easily formed by the partition. be able to.

  The invention according to claim 6 provides a starting base and a reaching base from the inside of the tunnel, and constructs a partition by arranging a plurality of element tubes from the starting base toward the reaching base. Thus, a tunnel enlarged portion can be formed.

  For this reason, even in places where construction sites cannot be secured on the ground, or where construction from the ground is difficult, such as deep underground, the tunnel widening section and the confluence of multiple tunnels built together The branch part can be easily constructed by using a tunnel.

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

  The same or equivalent parts as those in the conventional example will be described with the same reference numerals.

  FIG. 1 is a diagram in which the element tubes 6,... According to the present embodiment are connected to both side surfaces of the leading element tube 5, and FIG. 2 shows the joining / branching portions of the tunnels 9A and 9B constructed side by side. FIG. 2 is a perspective view constructed by a partition wall 10 formed by connecting element tubes 5, 6,...

  First, the configuration of the element tube 6 of the present embodiment will be described.

  In the element tube 6 of the present embodiment, most of the upper base, the lower base and the side surface are formed by the outer shell 6b having a substantially trapezoidal cross section forming a cylindrical body. Further, the side surfaces are a first inclined surface and a second inclined surface that obliquely intersect the upper and lower bases, and the first inclined surface and the second inclined surface are formed symmetrically with respect to the center line therebetween. The

  That is, the first inclined surface and the second inclined surface are formed so as to intersect at the same angle as the upper base and the lower base. For this reason, when the element tubes 6... Aligned in the same direction are connected, the partition wall 10 having a bent portion with an inner angle approximately twice the angle at which the upper base and the inclined surface intersect is constructed.

  And the groove part 6a of a concave-shaped cross section is continuously extended in this longitudinal direction at this 1st inclined surface. Here, the shielding plate 6d is used as an outer shell that forms the bottom surface of the groove 6a. That is, the opening of the outer shell 6b formed in a substantially U-shaped cross section is closed with the shielding plate 6d to form a substantially trapezoidal closed cross section.

  Further, the groove 6a is a groove having a substantially rectangular cross section that opens to the outside, and includes a shielding plate 6d and an end portion of the outer shell 6b that is bent into a bowl shape so that the end surface is in contact with the shielding plate 6d. It is formed.

  Further, reinforcing members 6e such as ribs are attached to the inner side surfaces of the outer shell 6b and the shielding plate 6d so that the element tube 6 is reinforced to have a structure capable of withstanding earth pressure and water pressure.

  Moreover, a pair of engagement brackets 6c and 6c are formed on the second inclined surface of the cylindrical body. The pair of engagement brackets 6 c and 6 c are members engaged with the groove portion 6 a of the element tube 6. The engagement brackets 6c and 6c are formed by bending a steel plate so that a substantially right triangle is formed when attached to the outer shell 6b.

  Here, the pair of engaging brackets 6c and 6c face each other so as to be substantially orthogonal to the side surface of the groove 6a so that the surfaces intersecting with the outer shell 6b are substantially parallel to each other, and are substantially equal to the width of the groove 6a. It is attached as follows.

  The engagement brackets 6c and 6c formed so as to protrude to the outside of the outer shell 6b are fitted into the recessed groove portion 6a, so that the element tube 6 to be arranged later on the element tube 6 arranged in advance is provided. Engaged.

  In the center of FIG. 1, the leading element tube 5 to be initially arranged is shown. The leading element pipe 5 is a special-shaped element pipe, and the leading element pipe 5 is used as a leading pipe, and element pipes 6 are connected to both sides as shown in FIG. For this reason, this leading element pipe 5 is provided with groove portions 5a and 5a on both side surfaces, and the engagement brackets 6c and 6c of the element tube 6 are engaged with the groove portions 5a and 5a.

  The leading element tube 5 has a larger cross section than the other element tubes 6,... In FIG. 1 in consideration of workability at the time of first propulsion, but is not limited thereto. It can also be formed in the same shape or the same size as the other element pipes 6.

  FIG. 5 shows an enlarged cross-sectional view of a part of the connecting portion between the element tubes 6 and 6. The hollow part for inject | pouring a water stop part forming material is demonstrated referring this FIG.

  On the right side of FIG. 5, one of the inner spaces provided at both ends of the groove 6a of the element tube 6 is shown. This inner space is formed in a substantially rectangular cross section at a position sandwiched between the outer shell 6b and the groove 6a by bending the end of the outer shell 6b into a bowl shape and closing the opening with a shielding plate 6d.

  Further, on the left side of FIG. 5, an inner space having a substantially right-angled cross section formed by the engagement bracket 6 c is shown.

  These inner spaces can be used as a hollow portion for injecting a water stop portion forming material in order to form a water stop portion at the connecting portion between the element pipes 6 and 6. Here, when using the ground improvement material 15 as the water stop portion forming material, the outer shell 6b and the engagement bracket 6c are provided with the through portions 13A and 13B so that the ground improvement material 15 is discharged to the underground 1 side. 13B is formed.

  The through portions 13A and 13B are formed in a circular shape or a slit shape. In addition, the ground improvement material 15 that has been discharged can be effectively spread in the direction of the adjacent element tube 6 by being formed in a direction inclined toward the element tube 6 that is disposed adjacently.

  A cement-based solidifying material, a water glass-based injection material, or the like can be used as the ground improvement material 15, and when the ground improvement material 15 is injected into the underground 1, the underground 1 is transformed into a water-stop portion having a low permeability coefficient. To do.

  Next, a method for constructing a tunnel enlargement part that forms a junction / branch part of the tunnel as shown in FIG. 2 will be described.

  First, the tunnel 9A is constructed over the entire line. The tunnel 9A is constructed by arranging arc-shaped segments as tunnel peripheral walls on an excavation surface excavated by, for example, a shield excavator.

  Then, at a predetermined position of the tunnel 9A, a part of the peripheral wall of the tunnel is removed, the underground 1 is dug from the inside of the tunnel 9A, and a start base 7 that extends in a direction perpendicular to the tunnel axis is formed.

  This starting base 7 can be formed in a rectangular parallelepiped space, for example, by gradually digging around the tunnel 9A.

  The arrival base 8 having the same shape is constructed in the same manner as the departure base 7 at a position away from the departure base 7 by a predetermined length along the tunnel 9A (see FIG. 2). If the starting base 7 and the arrival base 8 are constructed from the inside of the tunnel 9A, it is not necessary to secure a site for constructing these bases 7 and 8 on the ground.

  These bases 7 and 8 are constructed in order to start the element pipes 5, 6,. For this reason, the tunnel expansion part of this Embodiment is constructed between these bases 7 and 8.

  FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  Arrangement of the leading element tube 5 from the start base 7 can be performed from any position as long as the partition wall 10 is to be constructed. For example, the leading element tubes 5 and 5 have the top and bottom points of the circular cross section. To be placed in the section.

  The leading element pipe 5 is disposed in a drilling hole excavated by an excavator having a trapezoidal or rectangular excavation cross section. Here, although either a shield excavator or a propulsion device can be applied as the excavator, a case where a propulsion device is used in the present embodiment will be described below.

  The leading end of the leading element pipe 5 is brought into contact with the rear end of the excavator, and the leading end of the leading element pipe 5 is pushed from the starting base 7 with a propulsion jack, thereby pushing the leading element pipe 5 to the ground 1. Include. Here, the leading element tube 5 disposed at the apex portion has an upper base longer than the lower bottom, and the leading element tube 5 disposed at the lowest point portion is aligned in a direction in which the upper bottom is shorter than the lower bottom.

  The leading element pipe 5 is added at the wellhead by the amount pushed by the propulsion jack, and further pushed into the ground 1.

  And after arrangement | positioning of the leading element pipe | tube 5 is completed, as shown in FIG. 3, the element pipe | tubes 6, ... are arrange | positioned one after another on the both sides | surfaces of the leading element pipe | tube 5. As shown in FIG. That is, the excavator is dug along the groove portion 5a provided on the inclined surface of the leading element pipe 5, and the tip of the element pipe 6 aligned with the upper end in a direction in which the upper base is longer than the lower base is brought into contact with the rear end. The element pipe 6 is pushed into the ground 1 by pushing the rear end of the element pipe 6 from the starting base 7 with a propulsion jack.

  At this time, as shown in FIG. 1, the element tube 6 disposed later is driven so that the pair of engagement brackets 6 c and 6 c are engaged with the groove portion 5 a of the leading element tube 5.

  The element tube 6,... Is connected by repeating the propulsion process of the element tube 6,. The element pipe 6 arranged later tends to be arranged so as to approach the element pipe 6 arranged earlier, and the lengths of the inclined surfaces facing the element pipes 6 and 6 arranged adjacent to each other are equal. Therefore, the element tubes 6 and 6 can be easily brought close to each other with almost no gap between the element tubes 6 and 6.

  The element pipes 6,... Can be connected to each other by inserting the engaging brackets 6c, 6c into the groove 6a that has been excavated to form a cavity. Almost never.

  Furthermore, if the element tube 6 being propelled tries to rotate relative to the element tube 6 disposed in advance, the engagement brackets 6c and 6c come into contact with the side surface of the groove 6a to prevent the rotation. Therefore, the element tube 6 is disposed at an accurate position without leaving the element tube 6 disposed in advance.

  The process up to this point is the element tube placement step, and the water stop forming step will be described below with reference to FIG.

  First, in order to remove earth and sand clogged in the hollow portion surrounded by the outer shell 6b and the shielding plate 6d and the hollow portion inside the engagement bracket 6c, a high-pressure washing tube is inserted to wash the inside of the hollow portion. . Since this cleaning may be performed along a previously formed hollow portion, a continuous guide hole can be easily formed.

  And injection tube 14A, 14B is inserted in the inside of a hollow part. Side holes are provided at predetermined intervals on the side surfaces of the injection tubes 14A and 14B, and the hollow portion can be filled with the ground improvement material 15 leaking from the side holes as shown in FIG.

  The ground improvement material 15 filled in the hollow portion passes through the through portions 13A and 13B and is discharged to the ground 1, thereby changing the ground 1 and forming a water stop portion.

  By forming the water stop portion in this way, it is possible to block the path of water entering the inside through the gap between the groove portion 6a and the engagement bracket 6c.

  Moreover, since the ground improvement material 15 which is not inject | poured in the underground 1 is collect | recovered by pulling out injection | pouring pipe | tube 14A, 14B after injection | pouring, injection | pouring loss can be reduced.

  In FIG. 3, the element tubes 6,... Are extended from both side surfaces of the leading element tube 5 disposed at the apex portion to reach the leading element tube 5 disposed at the lowest point portion. In order to shorten the construction period, the element tubes 6,... Can be extended from the leading element tube 5 at the lowest point.

  As shown in FIG. 4, the element tubes 5, 6,... Having a substantially circular closed cross section are adjacent to each other by cutting a part of the inclined surface provided with the groove 6a and the engagement brackets 6c, 6c. A steel material (not shown) is inserted in the circumferential direction so as to cross the inside of the element tubes 5, 6,. And the integrated partition 10 is constructed | assembled by filling concrete inside.

  Then, a tunnel 9B is newly constructed in the ground 1 surrounded by the partition wall 10 and next to the tunnel 9A constructed in advance.

  As a result, two tunnels 9A and 9B are provided inside the partition wall 10. One or both tunnel peripheral walls of the tunnels 9A and 9B provided side by side are removed, and the excavation part 12 is formed by excavating between the tunnels 9A and 9B and the inner peripheral surface of the partition wall 10.

  The excavation part 12 is formed up to a range where a joining / branching space 11 (a part surrounded by a one-dot chain line in FIG. 4) required as a joining / branching part can be secured. Since the area surrounded by the partition wall 10 is cut off from the outside underground 1, it can be excavated safely and easily. Furthermore, another inner wall can be provided along the inner surface of the partition wall 10 which has been excavated and exposed.

  Next, the operation of the element pipe 6 and the method for constructing the tunnel enlargement portion of the present embodiment will be described.

  According to the construction of the element pipe 6 and the tunnel enlarged portion using the element pipe 6 as described above, the element pipe 6 is disposed adjacent to the groove 6a formed on one side of the element pipe 6 formed in a substantially trapezoidal cross section. A pair of engagement brackets 6c, 6c of the other element tube 6 are engaged and connected.

  For this reason, the bent portion of the partition wall 10 can be easily formed by simply matching the inclined surfaces of the adjacent element tubes 6 and 6, and a gap is almost generated between the adjacent element tubes 6 and 6. I will not let you.

  In addition, since the element pipe 6 has a substantially trapezoidal cross section, most of the element pipe 6 disposed by excavating the underground 1 forms a structural body structure of the partition wall 10. There is almost no wasted part.

  Furthermore, since the element tube 6 can be disposed while engaging the engaging brackets 6c and 6c with the groove 6a, the element tube 6 disposed later is not rolled, and the close proximity to the previously disposed element tube 6 can be accurately performed. Can be arranged at various positions.

  And since it can connect only by engaging the side surface part of the groove part 6a, and the surfaces of the engagement bracket 6c, the restriction | limiting of a connection direction is loose and it can respond also to the construction of a curve part, and a construction error easily. . In addition, since the element tube 6 is not forcedly pushed, excessive stress is generated in the constituent members of the element tube 6 such as the groove 6a and the engagement bracket 6c during the installation, thereby making the propulsion impossible. There is nothing to do.

  Further, since the first inclined surface and the second inclined surface which are the side surfaces of the substantially trapezoidal cross section are formed in line symmetry with respect to the center line therebetween, the respective inclined surfaces of the adjacent element tubes 6 and 6 facing each other. The lengths of the surfaces are equal, and no step is generated when the element tubes 6 and 6 are connected. Moreover, the bent part of the partition 10 can be easily formed at the same angle.

  Furthermore, since the hollow portion for injecting the ground improvement material 15 is previously extended inside the outer shell 6b or the engagement bracket 6c, the ground improvement material 15 can be easily injected, and the element can be quickly A water stop portion can be formed on the outside of the tube 6.

  And since the ground improvement material 15 should just pass through penetration part 13A, 13B and discharge | emit, it can be easily inject | poured into the underground 1 which forms a water stop part.

  For this reason, the water stop part can be formed in the connection part of the element pipes 6 and 6 and water can be reliably stopped. Moreover, the partition 10 can be safely constructed | assembled also in the underground 1 with a large earth pressure and water pressure, such as a deep underground, by improving the water stoppage of a connection part.

  Further, a departure base 7 and a arrival base 8 are provided from the inside of the tunnel 9A, and a plurality of element tubes 5, 6,... Thus, a tunnel enlarged portion can be formed.

  For this reason, even in places where construction sites cannot be secured on the ground, or places where construction from the ground such as deep underground is difficult, a widened portion of the tunnel or a plurality of tunnels 9A and 9B constructed side by side Can be constructed easily by using the tunnels 9A and 9B.

  Hereinafter, Example 1 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the first embodiment, as shown in FIG. 6, a case will be described in which the partition wall 25 is constructed so as to bridge the roof over the two adjacent tunnels 9A and 9B.

  In the first embodiment, two tunnels 9A and 9B are first constructed in parallel. Then, the start base 7 and the arrival base 8 are constructed by digging around the tunnel in a direction perpendicular to the tunnel axis from the inside of one or both of the tunnels 9A and 9B.

  The leading element pipe 16 to be first propelled from the starting base 7 is arranged near the middle of the tunnel 9A and the tunnel 9B. The element tubes 17 are connected to both sides of the leading element tube 16 to extend the partition wall 25 to the left and right sides.

  The element tubes 17,... Are connected by engaging the groove portion 17a and the pair of engagement brackets 17b, 17b.

  The element tubes 17 and 17 disposed at both ends of the partition wall 25 are connected to the tunnel peripheral walls of the tunnels 9A and 9B, respectively. And the steel material is arrange | positioned in circular arc shape so that element tube 16, 17, ... may be crossed, and the partition 25 is integrated by filling concrete inside.

  Since this partition wall 25 becomes a cross-sectional fan-shaped mountain retaining member supported at both ends by the tunnels 9A and 9B, the excavation part 19 can be easily formed by excavating the lower part. Then, by removing the tunnel peripheral wall facing the excavation part 19, the junction / branch part of the tunnels 9 </ b> A and 9 </ b> B can be constructed.

  Furthermore, in order to support the partition wall 25 from below, a column portion 18 can be provided between the tunnels 9A and 9B.

  Thus, by supporting the partition wall 25 in the tunnels 9A and 9B, the number of element pipes 17,... Arranged can be reduced, or the amount of excavation of the excavation part 19 can be reduced. 9A and 9B enlarged portions can be constructed.

  Further, as shown in FIG. 7, in addition to the partition wall 25 </ b> A that spans the upper portion like a roof, the partition wall 25 </ b> B can be provided in the lower portion. This partition 25B is constructed by connecting the element tubes 16, 17,... So as to connect the tunnel 9A and the lower part of the tunnel 9B.

  In this way, by constructing the enlarged portions of the tunnels 9A and 9B in a range surrounded by the partition walls 25A and 25B and the tunnels 9 and 9, the underground 1 having a large earth pressure and a large water pressure such as a deep underground can be obtained. Therefore, it is possible to safely construct an enlarged portion of the tunnels 9A and 9B.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, Example 2 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the second embodiment, as shown in FIG. 8, a case where two adjacent tunnels 9A and 9B are covered with an arcuate partition wall 26 having a semicircular sectional view will be described.

  In the second embodiment, the tunnel 9A is first constructed, and the periphery of the tunnel is dug in the direction perpendicular to the tunnel axis from the inside of the tunnel 9A to construct the start base 7 and the arrival base 8.

  The leading element tubes 20 and 20 that are first propelled from the starting base 7 are disposed at the lower end portions on both sides that are the leg portions of the arch-shaped partition wall 22. From the inside of the leading element pipes 20, 20, support piles 23,... For securing the support force of the partition wall 22 can be placed.

  Then, the element pipes 21,... Are connected from the leading element pipes 20, 20 arranged at the lower ends on both sides toward the apex of the partition wall 26 formed in an arch shape.

  The element pipes 21 are connected by engaging the groove 21a and the pair of engaging brackets 21b and 21b. After the element pipes 20, 21, 22,... Are closed in an arch shape by repeating this connection process, a steel material (not shown) is arranged so as to cross the element pipes 20, 21, 22,. The partition wall 26 is integrated by filling concrete inside.

  In the underground 1 covered with the partition wall 26, another tunnel 9B is constructed so as to be attached to the tunnel 9A. Then, one or both of the tunnel peripheral walls of the adjacent tunnels 9A and 9B are removed, and the inside of the partition wall 26 is excavated to form the excavated portion 24.

  Thus, since the arch-shaped partition wall 26 serves as a retaining member, the excavation part 24 can be easily formed by excavating the lower part thereof. Further, by removing the tunnel peripheral wall facing the excavation part 24, the joining / branching space 11 of the tunnels 9A and 9B as shown by the one-dot chain line in FIG. 8 can be formed.

  Thus, by providing the arch-shaped partition wall 26 so as to cover the upper half portions of the tunnels 9A, 9B, the number of element tubes 21,. This can be reduced, and the enlarged portion of the tunnels 9A and 9B can be constructed economically.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  Hereinafter, Example 3 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the above-described embodiment, as shown in FIG. 1, the upper base is similarly aligned with both sides of the leading element tube 5 arranged in a direction in which the upper base is longer than the lower base. The partition wall 10 having the bent portion is formed by connecting the element tubes 6... In the third embodiment, a method for forming the planar partition wall 27 will be described.

  In the third embodiment, as shown in FIG. 9, the leading element tube 5 to be installed first is arranged in a direction in which the upper base is longer than the lower base. The element pipes 6A and 6A to be connected to both sides are arranged so that the upper base is shorter than the lower base.

  The element tubes 5 and 6A having the inclined surfaces formed at the same angle as described above are disposed with their orientations reversed so that the inclination of the inclined surfaces is canceled, so that the upper and lower bases of the leading element tube 5 The upper and lower bases of the element tubes 6A and 6A are parallel to each other.

  Further, adjacent to the element pipes 6A and 6A, element pipes 6B and 6B are connected so that the upper base is longer than the lower base. Thus, the planar partition walls 27 can be constructed by sequentially connecting the element tubes 6A, 6B,.

  Further, by using element tubes 6A, 6B,... Having substantially trapezoidal cross sections that are line-symmetric with respect to the center line orthogonal to the upper and lower bases as in the third embodiment, The partition wall 27 having a flat portion can also be easily constructed.

  In addition, even if the overall shape of the bulkhead is various, such as a cylindrical shape, an elliptical shape, a horseshoe shape, a flat plate shape, etc., it can be constructed using the element tube 6 having the same shape, thus reducing the manufacturing cost. it can. Moreover, if it is the same shape, an arrangement | positioning place will not be limited but it can construct efficiently.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  Hereinafter, Example 4 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the said embodiment, although the ground improvement material 15 was used as a water stop part formation material, in Example 4, refrigerant | coolants, such as an antifreeze used in a freezing construction method, are used as a water stop part formation material.

  There are refrigerants that are directly injected into the ground 1 and those that are circulated in the injection pipe to indirectly cool the underground 1, but in the case of direct injection, the same configuration as in the above embodiment is used. Therefore, a configuration that uses what circulates in the injection tube will be described here.

  In the fourth embodiment, it is not necessary to provide the through-holes 13A and 13B in the outer shell 6b and the engaging bracket 6c, but the area where the injection tube to be inserted later comes into contact with the inner surface of the outer shell 6b and the engaging bracket 6c is large. The cooling efficiency can be improved by configuring the size to be large.

  Inside the hollow portion, for example, an injection pipe whose tip is folded back into a U-shape is inserted, and the refrigerant cooled by a refrigerator installed in the starting base 7 is circulated inside the injection pipe. By doing so, the low temperature portion spreads in the order of the injection tube, the outer shell 6b or the engagement bracket 6c, and the underground 1, and the underground 1 adjacent to the groove 6a is frozen to form a water stop portion.

  Since the water stop performance of the water stop part formed by the freezing method is very high, the water stop of the connecting part between the element pipes 6 and 6 can be reliably performed.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  Hereinafter, Example 5 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the above embodiment, as shown in FIG. 1, the leading element tube 5 having the upper and lower bases formed into planes has been described. However, the substantially trapezoidal cross section of the present invention includes the upper and lower bases. This includes a curved bottom.

  FIG. 10A is a cross-sectional view of a partition wall 28 constructed by connecting element tubes 30 whose upper bases are formed by curved outer shells 30f.

  As described above, if the inclined surface serving as the side surface of the substantially trapezoidal cross section is formed as a flat surface, the upper base or the lower base may be formed as a curved surface. By using the curved outer shell 30f, an arch effect can be expected, and a drilling hole can be formed safely. Furthermore, high load resistance can be shown also to the earth pressure and water pressure which act on the curved outer shell 30f.

  Further, since both side surfaces of the element tube 30 are formed to be flat, there is almost no overlapping portion even when the element tubes 30 and 30 are connected to each other, and the height of the side surface is set to an effective thickness of the partition wall 28. Therefore, the partition wall 28 can be constructed more economically than when the conventional circular element tube 2 is used.

  Further, as shown in FIG. 10B, the same effect as the element tube 30 can be obtained also in the case of the element tube 31 in which the upper and lower bases are formed by the curved outer shells 31f and 31f.

  Furthermore, the element pipes 31,... After connection can be the partition walls 29 in which the insides are integrated, as in the above-described embodiment and examples. As shown in FIG. 10B, after the element pipes 31 are connected to form the water stop portions 37,..., The shielding plate 31d and the outer shell 31b on the side to which the element pipe 31 is connected. Is cut to form an opening, and the inside of the element pipes 31,...

  And the connecting reinforcing bars 34 ... as a stress member which crosses in a connection direction are arrange | positioned, and an edge part is fixed to the reinforcing materials 31e and 31e. Further, reinforcing reinforcing bars 35,... Are arranged as shear reinforcing bars or distribution bars in the vertical direction of the reinforcing members 31e, 31e.

  After reinforcing in this way, concrete 36 as a cement-based solidifying material is filled into the element tubes 31,... With a pump or the like, and the partition walls 29 are integrated.

  In this way, the reinforcing members 31e,... Inside the partition wall 29 are mechanically continuously connected in the connecting direction by the connecting reinforcing bars 34,... It can be set as a one-piece structure.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  Hereinafter, Example 6 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the sixth embodiment, as shown in FIG. 11, a case where the guide groove 33a and the protrusion 33c are used as a connecting means between the element tubes 33 and 33 will be described.

  The element tube 33 is formed with the upper base, the lower base, and most of the side surfaces by an outer shell 33b having a substantially trapezoidal cross section that forms a cylindrical body. Further, the side surfaces are a first inclined surface and a second inclined surface that obliquely intersect the upper and lower bases, and the first inclined surface and the second inclined surface are formed symmetrically with respect to the center line therebetween. The

  And on this 1st inclined surface, a pair of concave-shaped cross-section guide groove part 33a, 33a is continuously extended in the longitudinal direction.

  Moreover, a pair of projection parts 33c and 33c are formed in the 2nd inclined surface of a cylinder. The pair of protrusions 33c and 33c are members inserted into the guide groove portions 33a and 33a, respectively. For this reason, the protrusions 33c and 33c are formed slightly smaller than the inner space of the guide groove 33a.

  That is, when the protrusions 33c and 33c of the element tube 33 arranged adjacent to the guide groove portions 33a and 33a are inserted, if the gap is small, the insertion resistance becomes large, and if the gap is large, the connection becomes weak. Both sizes are determined so that an appropriate gap is formed.

  According to the configuration of the element tube 33 of the sixth embodiment as described above, the bent portion of the partition wall 32 can be easily formed simply by matching the inclined surfaces of the adjacent element tubes 33 and 33 with each other. In addition, there is almost no gap between the adjacent element tubes 33 and 33.

  Further, since the element tube 33 has a substantially trapezoidal cross section, most of the element tube 33 arranged by excavating the underground 1 forms a structural body structure of the partition wall 32. There is almost no wasted part.

  Furthermore, since the element tube 33 can be disposed by inserting the projections 33c and 33c into the guide groove portions 33a and 33a, the element tube 33 disposed later is not rolled, and it is close to the previously disposed element tube 33. Can be placed in the exact position.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  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 or example, the description has been given of the partition 10, 25, 26, 27 in which the overall cross section formed by connecting the element tubes has a circular shape, a sector shape, a semicircular shape, or a linear shape. It is not limited to a shape, For example, the cross section may be an elliptical shape, a horseshoe shape, a quadrangular partition or the like.

  Further, not all of the partition walls need to be formed by the element tube, and for example, a connection tube (not shown) that can absorb construction errors can be used. For example, the connecting pipe has a sufficiently narrower spacing than the groove 6a of the adjacent element pipe 6 on one side and a spacing of the engaging brackets 6c and 6c of the adjacent element pipe 6 on the other side. It is formed in a shape having grooves with wide intervals.

  Thus, by making the joint part of the connecting pipe easy to match with the joint part of the adjacent element pipe 6, the partition wall can be easily formed into a closed cross section even if there is some construction error. Here, since the gap between the connecting pipe and the element pipe is larger than that of the other connecting portions, a sufficiently large water stop portion is formed.

  Furthermore, in the above-described embodiment or example, the example in which the partition walls are provided around the tunnels 9A and 9B has been described. However, the present invention is not limited to this, and the number of tunnels 9A and 9B can be changed without providing the tunnels 9A and 9B. May be. Also, when the tunnels 9A and 9B are provided, the construction order can be arbitrarily set.

  When the inner space formed by the outer shell 6b and the shielding plate 6d or the engagement bracket 6c is wide, the inner space is partitioned by a partition plate, or a tubular guide member is provided along the through holes 13A and 13B. It can also be extended and it can also be set as the hollow part for inject | pouring the water stop part forming material.

  Furthermore, the positions of the through holes 13A and 13B are not limited to the positions shown in FIG. 5. For example, the through holes 13A are provided on the side facing the outer shell of the adjacent element tube 6 to provide the element tubes 6 and 6B. The ground improvement material 15 may be injected into the gap 6.

  Moreover, in the said embodiment or Example, although the hollow part which inject | pours a water stop part forming material was provided in the side surface of the element pipe | tube 6 facing the adjacent element pipe | tube 6, it is not limited to this, An element It can also be provided on the upper surface and the lower surface of the tube 6 so as to protrude from the outer shell 6b toward the ground.

  Furthermore, the step of forming the water stop portion may be performed collectively after an arbitrary number of element tubes 6,... Are arranged, without being performed continuously immediately after the element tubes 6 are arranged.

  In the substantially rectangular gap between the grooves 5a, 6a,... Of the element tubes 5, 6,... Arranged in advance and the excavation surface excavated by the excavator, the excavation surface collapses. In order to prevent loosening of the ground and the natural ground, it is also possible to fill the filler with a strength capable of propelling the engagement brackets 6c and 6c.

  Furthermore, the pair of engaging brackets 6c, 6c of the element pipe 6 arranged in advance can be connected by engaging the groove 6a of the element pipe 6 arranged later.

  Moreover, the cross-sectional shape of the groove 6a may not be a rectangle, but may be a trapezoid or a reverse trapezoid. In this case, the shape of the opposing engagement brackets 6c, 6c is also formed in accordance with the shape of the groove 6a.

It is sectional drawing explaining the structure which connected several element pipe | tube of the best embodiment of this invention. It is a perspective view of the tunnel expansion part constructed | assembled by the best embodiment of this invention. It is sectional drawing explaining the operation | movement procedure of the construction method of a tunnel expansion part. It is sectional drawing explaining the tunnel expansion part in the AA line of FIG. It is a partially expanded sectional view explaining the state in which a ground improvement material is inject | poured. It is sectional drawing explaining the structure of the tunnel expansion part of Example 1. FIG. It is sectional drawing explaining the structure of the tunnel expansion part which has arrange | positioned the partition of Example 1 up and down. It is sectional drawing explaining the structure of the tunnel expansion part of Example 2. FIG. It is sectional drawing explaining the structure which connected the element pipe | tube of Example 3 in multiple numbers. (A) It is sectional drawing explaining the structure which connected the element tube in which the upper base of Example 5 was formed with the curved outer shell. (B) It is sectional drawing explaining the structure which connected the inside of the element pipe | tube with which the upper base and lower bottom of Example 5 were formed with the curved outer shell, and integrated. It is sectional drawing explaining the structure which connected multiple element pipe | tubes which provided the guide groove part and projection part of Example 6. FIG. It is sectional drawing of the partition constructed | assembled by connecting the circular element pipe | tube of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground 6 Element pipe 6a Groove part 6b Outer shell 6c Engagement bracket 7 Starting base 8 Arrival base 9A, 9B Tunnel 10 Bulkhead 15 Ground improvement material (water stop part forming material)
17, 21 Element tube 25-29 Bulkhead 30, 31 Element tube 33 Element tube 33a Guide groove 33b Outer shell 33c Protruding part 34 Reinforcing bar (stress member)
36 Concrete (cement-based solidification material)

Claims (6)

When forming the partition wall in the ground, it is arranged for each excavation hole by the excavator along the partition position, is a cylindrical element tube that connects the adjacent ones to each other to form the partition wall,
The cylindrical body is formed in a substantially trapezoidal cross section having a first inclined surface and a second inclined surface on opposite sides, and a groove portion having a concave cross section that is open to the outside is formed on the first inclined surface, and the groove portion is formed on a second inclined surface. An element tube, wherein a pair of engagement brackets are formed to protrude outward at an interval substantially equal to the width of the element tube.   The element tube according to claim 1, wherein the first inclined surface and the second inclined surface are formed symmetrically with respect to a center line therebetween.   A hollow portion for injecting the water stop portion forming material is formed in at least one of the inner space formed by the outer shell forming the cylindrical body and the groove portion or the engagement bracket. The element tube according to claim 1 or 2, characterized by the above-mentioned. When forming the partition wall in the ground, it is arranged for each excavation hole by the excavator along the partition position, is a cylindrical element tube that connects the adjacent ones to each other to form the partition wall,
The cylindrical body is formed in a substantially trapezoidal cross section having a first inclined surface and a second inclined surface on opposite sides, and a concave groove guide groove portion is formed on the first inclined surface. An element tube, characterized in that a protrusion having a shape that can be inserted into the guide groove protrudes outward.   A plurality of element pipes according to any one of claims 1 to 4 are connected in the ground, a stress member is disposed by communicating the inside of the element pipe in the connecting direction, and cement-based solidification is provided inside the element pipe. A partition wall characterized by being filled and integrated. A method for constructing a partition wall in which a plurality of element tubes according to any one of claims 1 to 3 are formed in the ground,
Excavating a tunnel, constructing a starting base that spreads in the direction perpendicular to the tunnel axis by digging the periphery from the inside of the tunnel, and with the starting base at a predetermined distance along the tunnel from the starting base Similarly, the arrival base is constructed, the underground is excavated from the start base toward the arrival base by an excavator, the element pipe is arranged in the excavation hole, and the groove of the element pipe arranged in advance The excavator is re-digged along to form a digging hole adjacent to the preceding element pipe, and the groove is arranged in the digging hole while engaging the engagement bracket of the other element pipe with the other. By repeating the step of disposing the element tube next to the already disposed element tube while engaging the groove and the engagement bracket, a plurality of the element tubes are arranged around the tunnel. Partition wall construction method of characterized in that said building a partition wall connecting the element pipe, drilling underground between the tunnel and the partition wall between the arrival base and the starting base.

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