JP4734146B2 - Filled steel segment for shield tunnel - Google Patents

Description

  The present invention relates to a medium-filled steel segment that mainly constitutes a wall surface as part of a structure embedded in the ground, and can also be applied to curved sections that are sequentially joined to other segments to form a tunnel wall surface, etc. The present invention relates to an intermediate steel segment for a shield tunnel having a smooth inner surface.

  An example of using a segment which is applied to a waterway tunnel or the like and whose tunnel inner surface becomes smooth upon completion of segment assembly is increasing. This eliminates the secondary lining process and seeks to obtain economic and construction effects by reducing the tunnel cross section. As a typical example of a segment suitable for such a purpose, there is an RC segment.

  On the other hand, since it is necessary to prepare various types of segments having a shape along the curve, a steel segment whose dimensions can be easily adjusted is generally used for the curved portion of the shield tunnel. Further, since the shield jack thrust acts in a complicated manner with the construction of the curved portion, a steel segment that is structurally easy to handle has been used.

  However, in the steel segment, the inner surface of the tunnel is a combination of steel plates, so it is not smooth. In a waterway tunnel, etc., in order to ensure the flow-down function, concrete is placed (secondary lining) to smooth the inner surface. The sex was secured.

  According to this method, two steps of segment assembly (primary lining) and concrete placing (secondary lining) are required, which hinders the shortening of the construction period.

  In order to solve this, an attempt has been made to use a segment in which concrete is previously placed on a steel segment.

  Specifically, a tunnel structure constructing method using an internally packed steel segment as shown in FIG. 17 is known (see, for example, Patent Document 1).

  First, in terms of configuration, in this conventional medium-filled steel segment, when a tunnel structure or shaft buried in the ground is constructed, a plurality of curved medium-filled steel segments 1 are adjacent to each other at the same time as excavation. A part of a partition wall such as a tunnel structure is configured by sequentially joining the other intermediate-filled steel segments 1 to be arranged and continuously connecting in the circumferential direction.

  This center-filled steel segment 1 has a concrete structure portion 3 that is packed in the inner surface 1a side of a steel shell portion 2 made of steel having a substantially circular horizontal cross section.

  The steel shell portion 2 is provided along the outer plate portion 2a covering the outer surface of the concrete structure portion 3 and the edges 2b and 2b of the outer plate portion 2a in the partition wall construction direction Y, and the inner surface 1a. Main girder members 4, 4 extending toward the inner surface 3 a of the concrete structure 3 raised one step higher than the above, and end connection plates 5, 5 provided at the respective edges 2 c, 2 c in the outer circumferential direction, And is generally formed.

  Further, inside the steel shell portion 2, middle girder members 6 and 6 are arranged in parallel with the main girder members 4 and 4, and a plurality of members arranged in parallel with the end connecting plates 5 and 5. Are connected by the connecting plate member 7 and the like.

  And the inside of this steel shell part 2 is filled with concrete beforehand except for the injection pipe 8 and the joint part 9, so that the secondary lining can be omitted by configuring the concrete structure part 3. It is configured.

  Next, the operation of this conventional medium-filled steel segment 1 will be described.

In the conventional medium-filled steel segment 1 configured as described above, a plurality of medium-filled steel segments 1 are connected to a wall surface of a tunnel or the like excavated by a shield machine or the like so as to form an annular shape in the circumferential direction X. At the same time, a cylindrical structure is constructed in the ground by being adjacently arranged in the partition construction direction Y that is the longitudinal direction of a tunnel or the like.
Japanese Patent Laying-Open No. 2005-42328 (paragraphs 0035 to 0036, FIGS. 1 to 9)

  However, in such a conventional medium-filled steel segment, when a load input in the partition construction direction Y is given to the main girder member 4 by a propulsion jack (not shown), the steel shell portion 2 bends, There was a risk of causing cracks in the concrete structure 3 due to crushing or peeling.

  In particular, when the tunnel structure 10 having the steeply curved portion 10a (L1> L2) as shown in FIG. 10 is constructed using the shield machine S, the smaller the radius of curvature R is, the smaller the each in-filled steel segment 1 is. Load during construction due to jack thrust etc. is easily applied.

  For this reason, due to the load concentration, in the vicinity of the corner portion where the strain displacement amount of the steel main girder member 4 is greater than or equal to the allowable strain displacement amount of the concrete structure portion 3, There was a problem that a crack was caused by peeling and a shield defect was generated.

In other words, in the segment produced in this way,
・ Distortion caused by welding during the production of steel segments
・ If concrete is placed in a distorted steel segment, the concrete will harden while being distorted.
・ When shield jack thrust acts on a segment manufactured with distortion in this way, it behaves so that distortion is restored,
-At that time, the deformation behavior of steel and concrete members is different,
・ As a result, the concrete was cracked, and its practical use was hindered.

  As a countermeasure, there has been adopted a method for preventing cracks in concrete by eliminating the production distortion of the steel segment by heat treatment or the like. However, skilled techniques are required for distortion removal, and a cost burden is imposed.

  Therefore, an object of the present invention is to provide an internally packed steel segment that can suppress the occurrence of cracks in an internally packed concrete structure portion even when the steel shell portion has a strain greater than a predetermined stress strain.

  In order to achieve the above object, the invention described in claim 1 constitutes a part of a partition wall constructed in the ground, and is packed inside a steel shell portion having an open inner surface. A steel-filled steel segment having a concrete structure part, wherein the steel shell part is provided along an outer plate part covering an outer surface of the concrete structure part, and an edge of the outer plate part in a partition construction direction. And a main girder member extending toward the inner surface of the concrete structure portion, and a buffer material is provided between the main girder member and the concrete structure portion. .

  The invention described in claim 2 is characterized in that the cushioning material has a flat plate shape and is interposed between a back surface side of the main girder member and an end surface of the concrete structure portion.

The invention described in claim 3 is characterized in that the cushioning material is provided in the vicinity of a corner portion where a connecting plate material provided orthogonal to the main girder member is brought into contact with the main girder member.

According to a fourth aspect of the present invention, the buffer material has a short flat plate shape, a horizontal buffer material provided on the back surface side of the main girder member, and a short flat plate type vertical buffer provided on the connecting plate material side. And is made of an L-shaped corner cushioning material combined so as to exhibit a substantially L-shape.

The invention described in claim 5 is that the cushioning material is a triangular corner cushioning material provided at the corner portion and having two orthogonal sides along the main girder member and the connecting plate material, respectively. It is a feature.

The invention described in claim 6 has a concrete filling portion that constitutes a part of a partition wall built in the ground and has a concrete structure portion filled inside a steel shell portion whose inner surface is open. A steel segment, wherein the steel shell portion includes an outer plate portion covering an outer surface of the concrete structure portion, a main girder member provided along an edge of the outer plate portion in a partition construction direction, and an outer plate portion And a plurality of connections in which the lower end edge is spaced apart from the outer plate portion and arranged in parallel with the end connection plate and connected between the main girder members. Each of the connecting plate members is provided with a cushioning material having a height that reaches the inner surface of the concrete structure portion with the lower end edge spaced apart from the outer plate portion.

The invention described in claim 7 is characterized in that the cushioning material is formed of a soft central cushioning material and a pair of hard supporting cushioning materials sandwiching the central cushioning material from both sides.

The invention described in claim 8 is characterized in that an anchor portion protrudes from the outer surface of the hard cushioning material.

According to a ninth aspect of the present invention, there is provided a waterproof tape in which a water-expandable rubber is disposed between the pair of hard cushioning materials and the water-expandable rubber is adhered over the outer peripheral surfaces of the pair of hard cushioning materials. It is characterized by being sealed.

The invention described in claim 10 is characterized in that a plate-like cushioning material is provided on the back side of the main girder member.

  The invention according to claim 1 configured as described above is generated in the main girder member due to a load input applied in a partition construction direction by a cushioning material provided between the main girder member and the concrete structure portion. The load transmitted to the concrete structure portion is suppressed so that the strain displacement is absorbed and falls within the allowable strain displacement amount of the concrete structure portion.

  For this reason, it is possible to reduce the possibility of cracks due to crushing or peeling in the concrete structure part, and to maintain good shielding performance.

  Moreover, the invention described in claim 2 is compressed because the cushioning material has a flat plate shape and is interposed between the back surface side of the main girder member and the end surface of the concrete structure portion. Further, the cushioning material disperses the input load in a plane and transmits it to the concrete structure portion.

  For this reason, stress concentration is unlikely to occur, and furthermore, the risk of cracking due to crushing or peeling in the concrete structure portion can be reduced.

According to a third aspect of the present invention, the cushioning material is provided in the vicinity of a corner portion in contact with the main girder member along a connecting plate material provided orthogonal to the main girder member.

  For this reason, the displacement of the main girder member due to the load input at the corner portion is absorbed by the cushioning material and is not easily transmitted to the concrete structure portion.

  Therefore, it is possible to effectively prevent cracking due to crushing or peeling near the corner portion of the concrete structure portion.

In the invention described in claim 4 , since the cushioning material is configured by combining a horizontal cushioning material having a short flat plate shape and a vertical cushioning material so as to exhibit a substantially L shape. Good properties.

Further, in the invention described in claim 5 , a triangular corner portion cushioning material as the cushioning material is provided in the corner portion, and two orthogonal sides are set along the main girder member and the connecting plate material, respectively. ing.

  For this reason, it is easy to mount, and cracks in the concrete structure near the corner due to jack thrust can be effectively prevented.

In the invention described in claim 6 , the connecting plate member is provided with a cushioning material having a height that allows the upper end edge to reach the inner surface of the concrete structure portion. Even if strain displacement occurs in the main girder member of the shell, the inner surface side of the concrete structure part is divided into a plurality of parts in the circumferential direction by the cushioning material, so that the amount of displacement of the divided concrete structure part Is a fraction of the amount of displacement of the steel shell.

  As a result, it is possible to reduce the possibility of cracking due to crushing or peeling on the inner surface side of the concrete structure portion, and maintain good shielding performance.

  Here, since the connecting plate material and the cushioning material are provided apart from the outer plate portion, when the concrete is placed on the steel shell portion to form the concrete structure portion, the concrete is applied to the entire steel shell portion. It will flow and workability will not be hindered.

Since the invention described in claim 7 is formed of a soft center cushioning material and a hard support cushioning material, when the concrete is placed on the steel shell portion to form the concrete structure portion, the cushioning material is There is no loss. Moreover, even if an uneven load acts on the main girder member, the load on the concrete structure portion can be reduced.

In the invention described in claim 8 , since the anchor portion protrudes from the outer surface of the support cushioning material, the cushioning material is integrated with the concrete structure portion via the anchor portion. For this reason, when a load is applied to the center-filled steel segment, it is possible to prevent a minute gap due to a shift from occurring at the interface between the cushioning material and the concrete structure portion.

According to the ninth aspect of the present invention, when the water expansion rubber is disposed between the pair of support cushioning materials, when the load is applied to the middle packed steel segment, the cushioning material, the concrete structure portion, Even if a minute gap due to deviation occurs at the interface, if the sewage reaches the water-expanded rubber through the minute gap, the water-expanded rubber expands and presses the support cushion so that the minute gap is sealed . For this reason, sewage does not reach the steel shell, and the deterioration of the steel shell portion can be reliably prevented.

  In this case, the periphery of the water-expandable rubber is surrounded by the water-stopping tape, and it is reliably prevented that water contacts the water-expandable rubber when the concrete is placed for forming the concrete structure portion.

  In addition, what is necessary is just to remove a water stop tape, when an inside-packed steel segment is formed.

In the invention described in claim 10 , since a plate-like cushioning material is provided on the back side of the main girder member, an uneven load acts in the partition construction direction, and the main girder member of the steel shell portion is applied. Even if the strain displacement occurs, the strain displacement generated in the main girder member is absorbed, and the load transmitted to the concrete structure portion is suppressed within the allowable strain displacement amount.

  Next, based on the drawings, description will be given of the best embodiment of the middle-filled steel segment for carrying out the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as the said prior art example.

  FIGS. 1 to 16 illustrate a middle-filled steel segment 11 as a segment according to an embodiment of the present invention.

  First, the configuration will be described. When the middle-filled steel segment 11 or the like according to the embodiment of the present invention as shown in FIG. 1 constructs a tunnel or a shaft in the ground, The stuffed steel segments 11 are arranged adjacent to each other so as to form an annular shape with the other stuffed steel segments 11, and are constructed in the ground while sequentially joining the end connecting plates 5 and 5 facing each other. As shown in FIG. 5, a jack thrust is applied by jacks J, J, etc., such as a shield machine S, and the tunnel structure, etc. Wall surfaces are constructed.

  In the middle-filled steel segment 11 of Example 1 shown in FIGS. 1 to 6, the concrete structure portion 3 is filled in the inside of a steel shell portion 12 having a substantially circular arc section with an open inner surface 1 a. have.

  In addition, FIG. 1 shows the structure seen from the inner surface side by expanding the curved shape of the steel shell portion 12 of the middle-filled steel segment 11 from which the concrete structure portion 3 is removed, in order to facilitate understanding. Show.

  As shown in FIG. 3, the steel shell portion 12 is provided along an outer plate portion 2a covering the outer surface of the concrete structure portion 3 and edges 2b and 2b of the outer plate portion 2a in the partition wall construction direction Y. The main girder members 4 and 4 extending toward the inner surface 3a of the concrete structure portion 3 raised one step higher than the inner surface 1a, and the end edges 2c and 2c in the circumferential direction X are provided. It has end connection plates 5 and 5 and is formed to have a substantially U-shaped cross section that opens the inner surface.

  Further, on the inner side of the steel shell portion 12, auxiliary girder members 13 and 13 are arranged on the left and right in parallel with the main girder members 4 and 4, and are arranged in parallel with the connecting plates 5 and 5. The main girder members 4 and 4 are connected by a plurality of connecting plate members 7 and the like.

  And between these main girder members 4 and 4 and the concrete structure part 3, the ultra high molecular weight polyethylene sheet 14 as a buffering material is provided.

  In this Example 1, the ultra high molecular weight polyethylene sheet 14 has a flat plate shape with a thickness of about 5 to 20 mm, and the back side 4a of the main girder member 4 and the partition construction direction Y of the concrete structure portion 3 It is interposed between the end surface 3b and is provided by being cut into a plurality of long and short pieces, and is covered with a filled concrete structure portion 3 as shown in FIGS.

  The ultrahigh molecular weight polyethylene sheet 14 is mainly composed of an ultrahigh molecular weight polyethylene material having physical properties as shown in FIG. 7, and as shown in FIG. 6, at a low load (compressive load: about 0 to 11. 8 MPa) has a small hardness and can be deformed so as to absorb the displacement of the main girder member 4 due to the jack thrust by compressive deformation.

  Further, when the load is high (compressive load: about 11.8 to 34.3 MPa), the hardness and elastic modulus are increased to form a plate shape, and the load is dispersed in a plane to load the concrete structure portion 3. It is configured so that concentration does not occur.

  Furthermore, the ultra high molecular weight polyethylene sheet 14 has chemical resistance, and has a property that it does not corrode even when it comes into contact with the sewage surface, for example.

  And the inside of this steel shell part 12 is filled with concrete beforehand except for the injection pipe 8 and the joint part 9, so that the secondary lining can be omitted by configuring the concrete structure part 3. It is configured.

  Next, the operation of the mid-packed steel segment structure of the first embodiment will be described.

  In the intermediate steel segment 11 of Example 1 configured as described above, as shown in FIG. 5, a tunnel or the like in which a plurality of intermediate steel segments 11 are excavated by jacks J, J of the shield machine S or the like. A cylindrical structure is constructed in the ground by being connected to the wall surface of the wall so as to be annular in the circumferential direction X, and arranged adjacent to the partition construction direction Y that is the longitudinal direction of a tunnel or the like.

  When a load input is applied to the main girder member 4 in the partition building construction direction Y by the jacks J, J, etc., the steel shell portion 12 is bent, and the main girder member 4 is partially displaced.

  For example, as shown in FIG. 10, the sharp curve portion 10a is constructed while the jack thrust is applied by the shield machine S or the like toward the traveling direction of the tunnel structure.

  In such a case, the left and right end portions of the main girder member 4 tend to have a large amount of partial displacement, but are provided between the main girder member 4 and the concrete structure portion 3. Further, the ultrahigh molecular weight polyethylene sheet 14 absorbs the strain displacement generated in the main girder member 4 by the load input applied in the partition construction direction Y, and the allowable strain displacement of the concrete structure portion 3 is suppressed.

  As shown in FIG. 6, the ultra-high molecular weight polyethylene sheet 14 of Example 1 has a small hardness at a low load (compressive load: about 0 to 11.8 MPa), and the main thrust due to jacking thrust due to compressive deformation. The displacement of the girder member 4 is absorbed.

  Further, when the load is high (compressive load: about 11.8 to 34.3 MPa), the hardness and elastic modulus are increased to form a plate shape, and the load is dispersed in a plane to load the concrete structure portion 3. The load is transmitted over a wide area so as not to cause concentration.

  And the said concrete structure part 3 is generally not crushed to the surface pressure of about 29.4 MPa.

  For this reason, if the load transmitted to the concrete structure part 3 is suppressed by the ultrahigh molecular weight polyethylene sheet 14 so as to be within the allowable strain displacement amount of the concrete structure part 3, the concrete structure part 3 It is possible to reduce the risk of cracking due to crushing or peeling and maintain good shielding performance.

  Moreover, in the first embodiment, the ultra high molecular weight polyethylene sheet 14 not only absorbs load input due to elastic deformation, but also has a flat plate shape, the back side 4a of the main girder member 4, and the concrete structure portion. 3 is interposed between the end face of the partition wall construction direction Y, so that at a certain input load or more, it is compressed in the thickness direction, the hardness and elastic modulus increase, and a plate-like ultra high molecular weight polyethylene The sheet 14 disperses the input load in a plane and transmits it to the concrete structure portion 3.

  For this reason, stress concentration is less likely to occur, and the risk of cracking due to crushing or peeling in the concrete structure 3 can be reduced.

  FIG. 8 illustrates a middle-filled steel segment 21 of Example 2 of the embodiment of the present invention.

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

  First, the configuration of the middle-stuffed steel segment 21 of Example 2 will be described focusing on the differences from the middle-stuffed steel segment 11 of Example 1. In the middle-stuffed steel segment 21 of Example 2, The buffer material is provided where the strain displacement amount of the steel main girder member 4 is equal to or larger than the allowable strain displacement amount of the concrete structure portion 3 (not shown).

  That is, in the second embodiment, the connecting plate members 7, 7 provided orthogonal to the main girder members 4, 4 are disposed in the vicinity of the corner portion 22 in contact with the main girder members 4, 4 so as to be L-shaped as a buffer material. A shaped corner cushioning material 23 is provided.

  The L-shaped corner cushioning material 23 is made of SBR (styrene butadiene rubber) and has a predetermined hardness (for example, hardness of about 70) as shown in FIG. It has a horizontal surface material 24 as a horizontal cushioning material provided along the back surface side 4a of the girder member 4, and a vertical surface material 25 as a short flat plate-like vertical cushioning material provided along the connecting plate material 7 side. It is mainly configured by being combined so as to exhibit a substantially L-shape.

  Next, the operation of the middle-filled steel segment 21 of Example 2 will be described.

  In the middle packed steel segment 21 of the second embodiment, in addition to the effect of the middle packed steel segment 11 of the first embodiment, the L-shaped corner cushioning materials 23 and 23 are made of the steel. The main girder member 4 is provided at the corner portions 22 and 22 where the strain displacement amount is equal to or larger than the allowable strain displacement amount of the concrete structure portion 3.

  For this reason, a load input is buffered efficiently and a shielding property can be kept favorable.

  That is, in the second embodiment, the L-shaped corner cushioning material is provided in the vicinity of the corner portions 22, 22 in contact with the main girder member 4 along the connecting plate material 7 provided orthogonal to the main girder member 4. 23, 23 vertical surface members 25, 25 are provided.

  For this reason, even if the displacement of the main girder member 4 due to the load input at the corner portions 22 and 22 is large, it is absorbed by the length of the longitudinal members 25 and 25 in the surface extending direction, and the concrete structure It becomes difficult to be transmitted to part 3.

  Therefore, cracks due to crushing or peeling near the corner portions 22 and 22 of the concrete structure portion 3 can be effectively prevented.

  Further, in this second embodiment, the L-shaped corner cushioning material 23 has a short flat plate shape, and is a horizontal cushioning material 24 as a horizontal cushioning material provided along the back surface side 4a of the main girder member 4; The plate-like cushioning material is configured to have a substantially flat L-shaped vertical cushioning material 25 that is provided along the connecting plate material 7 side so as to be substantially L-shaped. Can be processed into a desired size simply by cutting the substrate into a substantially rectangular shape, and the workability is good.

  About another structure and an effect, since it is substantially the same as that of the said inside-packed steel segment 11 of Example 1, description is abbreviate | omitted.

  FIG. 9 illustrates the middle-filled steel segment 31 of Example 3 of the embodiment of the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the part thru | or equivalent to the said Examples 1,2.

  First, the configuration of the middle-stuffed steel segment 31 of the third embodiment will be described with a focus on the differences from the middle-stuffed steel segment 21 of the second embodiment. In the middle-stuffed steel segment 31 of the third embodiment, As the cushioning material, a triangular corner cushioning material 32 of a triangular prism body having a substantially right isosceles triangular shape in a top view is made of SBR and has a predetermined hardness (for example, a hardness of about 70 or the like) as shown in FIG. It is configured.

  The triangular corner cushioning material 32 has two orthogonal sides in the vicinity of the corner portion 22 where the strain displacement amount of the steel main girder member 4 is equal to or greater than the allowable strain displacement amount of the concrete structure portion 3. It is provided along the main girder member 4 and the connecting plate member 7.

  Next, the operation of the middle-filled steel segment 31 of Example 3 will be described.

  In the middle packed steel segment 31 of the third embodiment, in addition to the effects of the middle packed steel segments 11 and 21 of the first and second embodiments, the triangular corner cushioning material 32 further includes two orthogonal sides. Are provided along the main girder member 4 and the connecting plate member 7, respectively.

  In the third embodiment, the triangular corner cushioning material 32 is constituted by a triangular prism body having an isosceles right triangular shape in a top view in which two orthogonal sides have substantially the same length.

  Accordingly, the triangular corner cushioning materials 32 and 32 having the same shape can be used in both the left and right corner portions 22 and 22, and can be easily mounted. Further, the increase in the types of components can be suppressed, and the jack thrust can be effectively used. The crack of the concrete structure part 3 in the corner parts 22 and 22 vicinity can be prevented. Other configurations and functions and effects are substantially the same as those of the first and second embodiments, and thus the description thereof is omitted.

  FIGS. 11 and 12 illustrate the outline of the middle-filled steel segment 41 of Example 4 of the embodiment of the present invention.

  The fourth embodiment of the middle-filled steel segment 41 of the fourth embodiment also has a steel cross section 12 made of steel having a substantially arc-shaped horizontal cross section with the inner surface 1a open, and is packed inside the steel shell section 12 so as to be filled more than the inner surface 1a. It is comprised from the concrete structure part 3 which rose one step higher. And as shown in FIG. 11, the steel shell part 12 is provided along the outer plate part 2a covering the outer surface of the concrete structure part 3 and the edges 2b and 2b of the outer plate part 2a in the partition construction direction Y. The main girder members 4, 4, the end connecting plates 5, 5 provided at the respective edges 2 c, 2 c in the circumferential direction X, and the main girder member 4 arranged in parallel with the end connecting plates 5, 5. The main part is comprised by the some connection board | plate material 7 connected between 4 and formed in the cross-sectional substantially U-shape which open | releases an inner surface.

  In this embodiment, when the concrete is placed in a mold (not shown) in order to form the concrete structure portion 3, the connecting plate material 7 is provided so that the fluidity of the concrete to the entire steel shell portion 12 can be secured. Is connected between the main girder members 4 and 4 which face each other with the lower end edge thereof being separated from the outer plate portion 2a.

  On the other hand, each connecting plate member 7 has a lower end edge along the lower end edge of the connecting plate member 7, and the upper end edge exceeds the upper end edge of the connecting plate member 7 and reaches the inner surface 3 a of the concrete structure portion 3. Are attached via a double-sided tape 43. The cushioning material 42 needs to have the ability to prevent collapse when placing concrete, while being able to relieve stress when a load is applied. For example, the ultra-high molecular weight polyethylene and SBR described above, and HDPE (high density polyethylene) have compressive yield strength that is about the fracture strength of concrete, and have excellent acid resistance and alkali resistance for sewage applications. Since the adhesiveness is good, the strain stress at the time of loading is absorbed, and the reaction force can be transmitted to the jack, it can be suitably employed.

  In the present embodiment, as shown in detail in FIG. 12, the cushioning material 42 has a soft cushioning material, for example, a central cushioning material 421 made of SBR50, and a center so as to sandwich the central cushioning material 421 from both sides. Each of the cushioning materials 421 is bonded to the outer surface of the cushioning material 421 and has a certain hardness, for example, a pair of support cushioning materials 422 made of SBR80.

  However, the structure is not limited to the three-layer structure, and may be one layer or two layers as long as it can relieve the stress at the time of loading and has a fall prevention performance when placing concrete.

  Next, the operation of the middle-filled steel segment 41 of the fourth embodiment will be described.

  In the middle-filled steel segment 41 of the fourth embodiment, a plurality of middle-filled steel segments 41 are annular in the circumferential direction X on the wall surface of a tunnel or the like excavated by jacks J, J of the shield machine S or the like. A cylindrical structure is built in the ground by being adjacently arranged in the partition construction direction Y that is the longitudinal direction of a tunnel or the like.

  Here, for example, as shown in FIG. 10, when the sharp curve portion 10 a is constructed, the thrusts of the jacks J, J of the shield machine S are changed to the left and right of the main girder member 4 of the center-filled steel segment 41. Acts unevenly on the edges. For this reason, a difference occurs in the amount of displacement of each of the left and right end portions of the main girder member 4 to deform the center-filled steel segment 41. When considering the deformation of the middle-filled steel segment 41, as shown in FIG. 13, if the load is applied to the tip of the main girder member 4 ignoring bending, the deformation of the steel shell 12 is simplified. Is that the other end is slightly displaced by Δ with respect to the one end. On the other hand, since the inner surface side of the concrete structure portion 3 is divided into a plurality of portions in the circumferential direction X by the cushioning material 42 and separated, the displacement δ of the concrete structure portion divided by the cushioning material 42 is a steel shell. This is a fraction of the amount of displacement Δ of the portion 12. For example, when the concrete structure portion 3 is evenly divided in the circumferential direction, the displacement amount δ of the divided concrete structure portion is 1 / the number divided into the displacement amount Δ of the steel shell portion 12. It becomes. That is, the sum total of the displacement amounts δ of the divided concrete structure portion becomes the displacement amount Δ of the steel shell portion 12.

  As a result, since the deformation on the inner surface side of the divided concrete structure portion can be suppressed, the possibility of cracking due to crushing or peeling on the inner surface side of the concrete structure portion 3 can be reduced, and good shielding performance can be maintained. . That is, since there is no crack on the inner surface side of the concrete structure portion 3 that comes into contact with the sewage, it is possible to prevent the sewage from penetrating into the concrete through the crack and deteriorating the concrete.

  Specifically, when a load of 1000 kN is applied to the main girder member 4 of the center-filled steel segment 41 of length 500 mm × peripheral arc length 2041 mm × height 147 mm, curvature radius 1147 mm, and central angle 102 degrees, the steel shell portion Although a displacement of 1.49 mm at the maximum occurred in No. 12, no crack occurred on the inner surface side of the concrete structure portion 3. On the other hand, when a load of 1000 kN is applied to the main girder member 4 of the same size middle-filled steel segment that does not use the cushioning material 42, a maximum displacement of 1.86 mm occurs in the steel shell portion 12. Cracks occurred at the corners on the inner surface side of the concrete structure 3.

  By the way, in Example 4 mentioned above, when a load is applied, the micro clearance gap by a shift | offset | difference may generate | occur | produce in the interface of the shock absorbing material 42 and the concrete structure part 3. When such a minute gap is generated, sewage permeates through the gap, and the steel shell 12 may be deteriorated.

  For this reason, as shown in FIG. 14, it is preferable to integrally form the anchor portion 422a on the outer surface near the upper end portion of the support cushioning material 422 constituting the cushioning material. Thereby, the buffer material 42 and the concrete structure part 3 are integrated via the anchor part 422a, and it can prevent that a micro clearance gap generate | occur | produces in those interfaces.

  Further, even if a minute gap is generated at the interface between the buffer material 42 and the concrete structure portion 3, it is more preferable to seal the minute gap so that the sewage does not reach the steel shell portion 12 through the minute gap. preferable. That is, as shown in FIG. 15, if the water expansion rubber 44 is disposed in a space defined by the central cushioning material 421 and the pair of supporting cushioning materials 422 constituting the cushioning material 42, a plurality of middle-stuffed steel segments 41 are provided. Are connected to a wall surface of a tunnel or the like excavated by jacks J and J of the shield machine S or the like so as to form an annular shape in the circumferential direction X, and a plurality of adjacently arranged in the partition construction direction Y that is the longitudinal direction of the tunnel or the like When a cylindrical structure is constructed in the ground, even if a minute gap that cannot be seen is generated at the interface between the cushioning material 42 and the concrete structure portion 3, If the sewage penetrates and reaches the water expansion rubber 44, the water expansion rubber 44 receives water and expands. Therefore, the support cushioning material 422 is pressed toward the concrete structure portion 3 to support the support cushioning material 422. It is possible to seal the small gap that occurs at the interface between the concrete structure 3 via the supporting cushioning material 422.

  As a result, the sewage does not reach the steel shell 12 and the deterioration of the steel shell 12 can be reliably prevented.

  In addition, when concrete is cast on the steel shell 12 to form the concrete structure portion 3, it is stopped over the outer peripheral surfaces of the pair of support cushioning materials 422 so that the moisture of the concrete does not contact the water expansion rubber 44. Water tape 45 is applied. That is, the periphery of the water expansion rubber 44 is surrounded by the water-stopping tape 45, so that it is possible to reliably prevent water from coming into contact with the water expansion rubber 44 when placing concrete. The water blocking tape 45 may be removed when the filling steel segment 41 is formed.

  Further, as shown in FIG. 16, a buffer material 42 may be provided on the connecting plate material 7, and a plate-like buffer material 46 may be provided on the back side of the main girder member 4.

  Thus, by providing the plate-like cushioning material 46 on the back surface side of the main girder member 4, the plate-like cushioning material 46 causes the strain displacement of the main girder member 4 due to the load in the partition construction direction Y acting on the main girder member 4. Since it is absorbed, the strain displacement of the concrete structure part 3 can be further suppressed.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the middle-filled steel segment 11 of the first embodiment, a plurality of arc-plate shaped middle-filled steel segments 11, 11 in the circumferential direction are connected to other segments 11 so as to form an annular shape. Although described in particular, the present invention is not limited to this, and for example, a circular arc on a side surface such as a flat plate shape, a rectangular plate shape, a polygonal plate shape segment, etc. As long as it constitutes a partition wall of a structure embedded in the ground, the cross-sectional shape is any polygonal shape such as a rectangular cross-sectional shape, an oval shape or an oval shape, etc. It may be an intermediate steel segment in shape.

  Although it has shown and demonstrated what constructs | assembles the partition wall of a tunnel structure in the ground, it is not restricted to this especially, In the thing which constructs a shaft by the press-fitting method using jack thrust, the said inside-packed steel segment 11 is used. Even if it uses, what is necessary is just to apply a predetermined load in the tunnel traveling direction.

  Moreover, in the said Example 1, although the ultra high molecular weight polyethylene sheet 14 comprised by the ultra high molecular weight polyethylene material as a buffering material is provided, it is not restricted especially, For example, as shown in FIG. You may comprise using other structural resin materials, such as nylon and HDPE.

  Furthermore, in this Example 1, the ultra high molecular weight polyethylene sheet 14 is cut between a plurality of long and short pieces as shown in FIG. For example, the main girder member may be configured such that the long and short pieces of ultrahigh molecular weight polyethylene sheets 14 and 14 are continuously arranged at a position inside the inner end edge of each connecting plate member 7. And if it is a buffering material provided between the said concrete structure part, a shape, quantity, and a material will not be specifically limited.

In the middle-filled steel segment of Example 1 of the best mode of the present invention, the curved shape of the steel shell portion of the middle-packed steel segment from which the concrete structure portion has been removed is developed in a planar shape from the inner side surface side. It is a typical top view which shows the structure which looked. FIG. 2 is a cross-sectional view at a position along the line AA in FIG. FIG. 3 is a plan view seen from the inner surface side in the middle-stuffed steel segment of Example 1. FIG. 4 is a cross-sectional view at a position along the line BB in FIG. It is a partially-omission perspective view explaining a mode that the main girder member of the middle steel-made segment of Example 1 is pressed in a partition construction direction with a propulsion jack. It is a graph explaining the relationship between the compressive load of the ultrahigh molecular weight polyethylene sheet as a buffer material used for the medium-stuffed steel segment of Example 1, and the amount of deflection. It is a table | surface figure which compares the physical property of the shock absorbing material used for an inside-packed steel segment in embodiment. In the middle-filled steel segment of Example 2 of the best mode of the present invention, the curved shape of the steel shell portion of the middle-filled steel segment from which the concrete structure portion has been removed is developed in a planar shape from the inner side surface side. It is a typical top view which shows the structure which looked. In the middle-filled steel segment of Example 3 of the best mode of the present invention, the curved shape of the steel shell portion of the middle-packed steel segment from which the concrete structure portion has been removed is developed in a planar shape from the inner side surface side. It is a typical top view which shows the structure which looked. It is a typical top view explaining a sharp curve part among tunnel structures built in the ground. It is a typical perspective view which shows the steel shell part of the middle-stuffed steel segment which removed the concrete structure part in the middle-stuffed steel segment of Example 4 of this embodiment of this invention. It is a longitudinal cross-sectional view which shows the shock absorbing material of the middle packing steel segment of FIG. FIG. 12 is a schematic plan view for explaining displacement when a shear load is applied to the middle-filled steel segment of FIG. 11. It is a longitudinal cross-sectional view which shows the modification of the shock absorbing material of FIG. It is a longitudinal cross-sectional view which shows the other modification of the shock absorbing material of FIG. FIG. 10 is a schematic perspective view showing a steel shell portion of a medium-filled steel segment from which a concrete structure portion is removed in a modification of the medium-filled steel segment of Example 4. It is a perspective view of a segment which explained the composition of the conventional middle-stuffed steel segment, and removed a part of the concrete structure part filled in the middle.

Explanation of symbols

2a Outer plate portion 3 Concrete structure portion 4 Main girder member 5 End connection plate 7 Connection plate material 11, 21, 31, 41 Filled steel segment 12 Steel shell portion 14 Ultra high molecular weight polyethylene sheet (buffer material)
22 Corner portion 23 L-shaped corner cushioning material 24 Horizontal surface material (horizontal cushioning material)
25 Longitudinal material (vertical cushioning material)
32 Triangular corner cushioning material 42 Buffering material 421 Center cushioning material 422 Support cushioning material 422a Anchor portion 44 Water expansion rubber 45 Waterstop tape 46 Plate cushioning material

Claims (10)

  A steel-filled steel segment comprising a part of a partition wall constructed in the ground and having a concrete structure part filled inside a steel steel shell part whose inner surface is open, The outer plate portion covering the outer surface of the concrete structure portion; and a main girder member provided along the partition wall construction direction edge of the outer plate portion and extending toward the inner surface of the concrete structure portion; An intermediate-packed steel segment for a shield tunnel, wherein a cushioning material is provided between the main girder member and the concrete structure portion.   The intermediate packing steel for shield tunnel according to claim 1, wherein the cushioning material has a flat plate shape and is interposed between a back surface side of the main girder member and an end surface of the concrete structure portion. Made segment. The intermediate packing for shield tunnel according to claim 1 or 2 , wherein the cushioning material is provided in the vicinity of a corner portion where a connecting plate material provided orthogonal to the main girder member is brought into contact with the main girder member. Steel segment. The buffer material has a short flat plate shape, and has a horizontal buffer material provided on the back surface side of the main girder member and a short flat plate-shaped vertical buffer material provided on the connecting plate material side, and is substantially L-shaped. It consists of the L-shaped corner part cushioning material combined so that the shape may be exhibited, The inside steel segment for shield tunnels of Claim 3 characterized by the above-mentioned. 4. The shield tunnel according to claim 3 , wherein the cushioning material is a triangular corner cushioning material provided at the corner portion and having two orthogonal sides along the main girder member and the connecting plate material, respectively. Filled steel segment for use.   A steel-filled steel segment comprising a part of a partition wall constructed in the ground and having a concrete structure part filled inside a steel steel shell part whose inner surface is open, The portion includes an outer plate portion covering the outer surface of the concrete structure portion, a main girder member provided along an edge of the outer plate portion in the partition construction direction, and an edge of the outer plate portion in the outer circumferential direction of the partition wall. An end connecting plate provided, and a plurality of connecting plate members that are arranged in parallel to the end connecting plate with the lower end edge spaced apart from the outer plate portion and connected between the main girder members, An intermediate-packed steel segment for shield tunnels, characterized in that each connecting plate is provided with a cushioning material that is spaced from the plate and has an upper edge that reaches the inner surface of the concrete structure. The said shock absorbing material is formed from a soft center shock absorbing material and a pair of hard support shock absorbing material which pinches | interposes this center shock absorbing material from both sides, The segment made from the filling steel for shield tunnels of Claim 6 characterized by the above-mentioned. 8. An intermediate-packed steel segment for a shield tunnel according to claim 7, wherein an anchor portion protrudes from the outer surface of each of the support cushioning materials. A water expansion rubber is disposed between the pair of support cushioning materials, and the water expansion rubber is sealed with a water-stopping tape adhered across the outer peripheral surfaces of the pair of support cushioning materials. Item 8. A medium-filled steel segment for a shield tunnel according to Item 7 . 10. The intermediate-packed steel segment for shield tunnel according to claim 6, wherein a plate-like cushioning material is provided on the back side of the main girder member.

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