JP6710586B2 - Gate type structure and construction method thereof - Google Patents

Description

The present invention relates to a portal structure having a structure in which a precast portal block is supported by a supporting base member, and a method for constructing the portal structure.

Conventionally, in bridges and underdrain structures that cross roads, in structures with a span of about 3.0 to 15.0 m, underdrain structures such as box culverts have been used as alternatives, and rivers are provided inside the underdrain structure. If there are existing facilities, etc., a gate structure may be used.

The structure of such a portal structure is examined by analysis. In the analysis, it is necessary to consider the design load acting on the upper surface and also to be an anti-earth pressure structure against the earth pressure on the side surface. However, due to the analytical modeling of the lower end portion of the side wall, the consistency between the analytical model and the actual structure in terms of displacement and behavior may be reduced.

Furthermore, these days, it is also necessary to perform an analysis assuming an earthquake, which is becoming more and more complicated.If the consistency between the analysis model and the actual structure in terms of displacement and behavior decreases, the safety of the actual structure will decrease. There was a possibility that it might be affected.

Specifically, in the analysis model, when the support structure of the side wall lower end part is modeled as a hinge support structure that restrains the displacement of the fulcrum part and allows the rotation of the member, the support structure of the side wall lower end part of the actual structure is It is necessary to exert the supporting function under the constraint condition as the hinge supporting structure in the analytical model.

For example, as a general hinge support structure in an actual structure, Patent Document 1 discloses a support structure 100 called a menase hinge in which an upright member is fixed and a plastic hinge is formed at a joint portion at a lower end portion of the member (see FIG. ))) is described, but it cannot be said that the analysis model and the actual structure are highly consistent in terms of displacement and behavior.

Further, in the structure 200 using the precast block, there is a supporting structure 210 (see FIG. 7B) as disclosed in Patent Document 2 as a supporting portion that becomes a hinge supporting structure, but an enlarged cross section of the supporting structure 210. As shown in FIG. 7C showing the figure, since the joint material 220 is installed on the side surface of the lower end portion 201 of the supporting base member 200, the restraint of the displacement of the member required to function as the hinge supporting structure. However, the restraint effect in the horizontal direction is insufficient, and it is expected that the displacement and behavior of the analytical model and the actual structure will differ greatly, especially when a large horizontal force or vertical force is applied.

JP, 2007-270566, A JP-A-6-57770

Therefore, it is an object of the present invention to provide a portal structure having a high consistency with displacement and behavior in an analytical model and a method for constructing the same.

According to the present invention, a precast gate block that forms a gate shape with a side wall portion and a floor slab, and an arrangement recess in which a lower end portion of the side wall portion is arranged are formed on an upper surface along an extension direction, and the lower end portion of the side wall portion is formed. A support base member that supports a portion and a liquid filling and hardening member that is filled and cured between the side wall portion lower end portion arranged in the arrangement concave portion, and the bottom surface of the side wall portion lower end portion and the arrangement concave portion. The space holding member having a predetermined height between the bottom surface and the bottom surface is a gate type structure arranged at a predetermined distance in the extension direction .

Further, according to the present invention, the support base member is arranged along the extension direction of the gate structure, and the side wall portion and the floor slab portion form a gate shape in the arrangement recess formed on the upper surface of the support base member. place the side wall lower end portion of the precast steel portal block, in the arrangement recess, filled with a liquid charge Hamazai between the arranged the side wall lower end portion, and curing the liquid filler filled A liquid filling/hardening member is constituted, the gate-shaped block is supported by the supporting base member, and a spacing member having a predetermined height is provided between the bottom surface of the lower end portion of the side wall portion and the bottom surface of the arrangement concave portion. The method is a method of constructing a gate-shaped structure, which is arranged at a predetermined interval in the direction .

The lower end portion of the side wall portion indicates not only the lower end of the side wall portion but also an area having a predetermined height from the lower end.
The support base member includes a member formed by casting in situ if it can support the lower end portion of the side wall, a precast member, or a member constructed by combining a precast member and a casting member.

The liquid filling and hardening member is a liquid or gel that can be filled into a filling portion, and is a filling material that develops strength by hardening after filling, cement paste such as high-strength cement paste, mortar such as high-strength mortar, Alternatively, a cement-based filler such as concrete or a resin-based filler having desired properties such as durability and strength can be used.

The portal structure may be composed of a precast portal block alone, or may be composed of a plurality of portal blocks arranged along the extension direction. Further, the plurality of gate-shaped blocks arranged along the extension direction may be structurally integrated by connecting in the extension direction, may be simply connected, or may be a structure that is not connected. The gate-shaped structure may be composed of only the gate-shaped block, or a part thereof may be composed of cast-in-place concrete.

According to the present invention, as a support structure for supporting the lower end portion of the side wall portion by the support base member, it is suitable under a constraint condition as a hinge support structure for restraining displacement of the lower end portion of the side wall portion and allowing rotation of the side wall portion. It can exert a supporting function. Therefore, it is possible to construct a highly safe gate-type structure in which the analysis model and the actual structure are highly consistent in displacement and behavior.

In addition, since the spacing member having a predetermined height is disposed at a predetermined distance in the extension direction between the bottom surface of the lower end portion of the side wall portion and the bottom surface of the arrangement recess, the liquid filling and hardening member can be secured. Can be configured to.

More specifically, since a space can be secured between the bottom surface of the lower end portion of the side wall and the bottom surface of the arrangement recess by the spacing material, the liquid filling material forming the liquid filling and hardening member can be reliably filled through the spacing. Therefore, the dense liquid-filled and hardened member can be configured.

Further, by disposing the spacing member, a desired spacing can be secured between the bottom surface of the disposing recess and the bottom surface of the lower end portion of the side wall portion, so that the hinge support structure having an appropriate rotation function can be configured.

As an aspect of the present invention, the liquid filling and hardening member can have a high compressive strength and a low elastic coefficient with respect to the side wall portion and the supporting base member.
According to the present invention, the liquid filling and hardening member having high compressive strength with respect to the side wall portion and the supporting base member appropriately restrains the displacement of the lower end portion of the side wall portion and has a low elastic coefficient. The rotation can be properly allowed.

Further, as an aspect of the present invention, the compressive strength of the liquid filling and hardening member can be set to 60 to 90 N/mm ² .
According to the present invention, the precast gate-shaped block has a typical compressive strength of 30 to 40 N/mm ² and the supporting base member has a typical compressive strength of 18 to 24 N/mm ² . Since the liquid filling and hardening member having a compressive strength of 60 to 90 N/mm ² has sufficiently high strength, the displacement of the lower end portion of the side wall portion can be appropriately restrained.

Further, as an aspect of the present invention, the elastic coefficient of the liquid filling and hardening member can be set to 1.8×10 ^{4 to} 2.1×10 ⁴ N/mm ² .
According to the present invention, the precast gate-shaped block has a general elastic modulus of 2.8×10 ^{4 to} 3.1×10 ⁴ N/mm ² , and the general elastic modulus of the supporting base member is 2.2. whereas a ^{× 10 4 ~2.5 × 10 4 N} / mm 2, the liquid filling stiffener elastic coefficient is ^{1.8 × 10 4 ~2.1 × 10 4} N / mm 2 is Since the amount of deformation with respect to the same load is large, that is, the deformability is high, the rotation of the side wall portion can be permitted.

Further, as an aspect of the present invention, the thickness of the liquid filling and hardening member formed in a lateral portion between the outer surface of the lower end portion of the side wall portion and the inner surface of the arrangement recess can be 50 to 100 mm.
According to the present invention, it is durable and can properly exhibit the supporting function under the constraint condition as the hinge supporting structure. Therefore, it is possible to construct a highly safe gate-type structure in which the analysis model and the actual structure have a high degree of consistency in displacement and behavior.

More specifically, when the lateral thickness of the liquid-filled and hardened member is less than 50 mm, the stress level with respect to the amount of deformation due to displacement/rotation exceeds the allowable value of the liquid-filled and hardened member, causing long-term cracking. It is difficult to maintain a simple hinge mechanism.
On the other hand, by setting the thickness of the liquid filling and hardening member to 50 to 100 mm, it is possible to obtain an appropriate supporting state due to the stress of the liquid filling and hardening member during horizontal displacement and member rotation for a long period of time.

Further, as an aspect of the present invention, the distance between the inner surfaces of the side wall portions can be set to 1.0 to 5.0 times the height of the inner surface of the side wall portions.
According to the present invention, a hinge-type structure that is supported by a structure that appropriately exhibits a supporting function under a constraint condition as a hinge support structure, has a high consistency of displacement and behavior between an analytical model and an actual structure, and is highly safe. Can be built.

More specifically, when the distance between the inner surfaces of the side wall portions is less than 1.0 times the height of the inner surface of the side wall portion, that is, in the vertically long gate-shaped structure in which the height direction is longer than the width direction. In some cases, the rotation of the side wall portion becomes large, and the hinge support structure that supports the lower end portion of the side wall portion does not function sufficiently. On the contrary, when the distance between the inner surfaces of the side wall portions is greater than 5.0 times the inner surface height of the side wall portions, that is, the widthwise direction is long in the height direction. In this case, since the floor plate portion is deformed more than the side wall portion due to the influence of the vertical force, the horizontal force at the lower end portion of the side wall portion becomes too large, which may exceed the allowable range for the hinge support structure.

On the other hand, by setting the distance between the inner surfaces of the side wall portions to be 1.0 to 5.0 times the height of the inner surface of the side wall portion, the deformation of the side wall portion and the floor slab, and the side wall Displacement and rotation are well balanced at the lower end of the part, and it can be properly supported under the constraint conditions of the hinge support structure that supports the lower end of the side wall, so the displacement and behavior of the analytical model and the actual structure are consistent. It is possible to construct a gate structure that is high and highly safe.

Further, as an aspect of the present invention, a plurality of the gate blocks can be arranged in the extension direction.
According to the present invention, a portal structure having a desired extension can be constructed.

According to the present invention, it is possible to provide a portal structure that is highly consistent with displacement and behavior in an analytical model and a method for constructing the same.

The partial perspective view of a gate type structure. Explanatory drawing of a gate structure. Construction flow diagram of the gate structure. Construction explanatory drawing of a gate type structure. Construction explanatory drawing of a gate type structure. Construction explanatory drawing of a gate type structure. Explanatory drawing of the gate type structure of a conventional structure.

An embodiment of the present invention will be described in detail below with reference to the drawings.
The portal structure 1 shown in FIGS. 1 to 6 is a portal structure that is used, for example, to configure a water channel or the like, and is configured by assembling a portal block 10 made of precast concrete.

1 shows a partial perspective view of the portal structure 1, and FIG. 2 shows an explanatory view of the portal structure 1. 2A shows a cross-sectional view of the gate-shaped structure 1, more specifically, the left half of the cross-sectional view shows the aa cross-sectional view of FIG. 1, and the right half of the cross-sectional view is the bb cross-section of FIG. The figure is shown.

2(b) is a sectional view taken along line cc in FIG. 2(a), FIG. 2(c) is an enlarged sectional view of portion a in FIG. 2(a), and FIG. 2(a) is an enlarged cross-sectional view of the b portion, and FIG. 2(e) is an enlarged cross-sectional view of the c portion in FIG. 2(a).

Further, FIG. 3 shows a construction flow chart of the portal structure 1, FIGS. 4 and 5 show construction explanatory diagrams of the portal structure 1, and FIG. 6 shows explanatory diagrams of the portal structure 1. .. More specifically, FIG. 4( a) shows the foundation work, FIG. 4( b) shows the installation of the support base member 20, and FIG. 5( a) shows the spacing member for the recess 21 of the support base member 20. The arrangement of 30 is shown in FIG. 5, and FIG. 5B shows the installation of the portal block 10. FIG. 6A shows the filling of the liquid filler, and FIG. 6B shows the sectional view for explaining the filling of the liquid filler.

The gate-shaped structure 1 is a concrete structure having a gate-shaped cross section having an internal space including a side wall portion and a floor slab, and has a predetermined length in the extension direction L.
More specifically, the gate-shaped structure 1 includes a plurality of precast gate-shaped blocks 10 arranged in the extension direction L and a lower end portion 11a of a side wall portion 11 of the gate-shaped block 10 (hereinafter, the side wall lower end portion 11a). Around the side wall lower end portion 11a of the gate-shaped block 10 in the placement recess 21 of the support base member 20, the support base member 20 for supporting the support base member 20, the spacing member 30 placed in the placement recess 21 of the support base member 20. And a liquid filling/hardening member 40 that is filled with the liquid filling and hardening member 40.

The gate-shaped block 10 is composed of a side wall portion 11 and a floor slab portion 12, and the distance between the inner surfaces of the side wall portion 11 with respect to the height (length in the height direction H) on the inner surface side of the side wall portion 11. The block has a front view gate shape in which the (length in the width direction W) is in the range of 1.0 to 5.0 times, and has a predetermined length in the extension direction L.

Incidentally, portal block 10, the compressive strength is 30~40N / mm ^2, an elastic modulus is made of ^{2.8 × 10 4 ~3.1 × 10 4} N / mm 2 precast. A plurality of the gate blocks 10 configured as described above are arranged in the extension direction L and are configured to be connectable by a connecting jig (not shown).

The supporting base member 20 that supports the side wall lower end portion 11a of the gate-shaped block 10 has a horizontally long rectangular shape in front view that is long in the extension direction L, has a compressive strength of 18 to 24 N/mm ² , and an elastic coefficient of 2. It is a cast-in-place concrete member having a density of 2×10 ^{4 to} 2.5×10 ⁴ N/mm ² , and an arrangement concave portion 21 that allows loose fitting of the side wall lower end portion 11a is provided on the upper surface 20a along the extension direction L. Has been formed.

The arrangement recess 21 formed in a concave shape with respect to the upper surface 20a of the supporting base member 20 is wider than the width of the lower end portion 11a of the side wall portion, and is one of the lower end portion 11a of the side wall portion arranged at a predetermined distance from the bottom surface 21a. It is a recess having a rectangular cross-section with a depth to fill the part.

In the present embodiment, the distance between the inner side surfaces 21b of the arrangement recess 21 is 50 to 100 mm on both sides when the side wall lower end portion 11a is arranged at the center of the arrangement recess 21 in the width direction W. Is formed in the width direction W.

Further, the depth from the bottom surface 21a to the top surface 20a (the length in the height direction H) is such that a space of 50 to 100 mm is formed between the bottom surface 21a and the bottom surface of the side wall lower end portion 11a, and from the bottom surface 21a. The lower end portion 11a of the side wall portion, which is arranged with the space therebetween, is formed to a depth that fills a predetermined length.

The spacing member 30 is placed on the bottom surface 21a of the placement recess 21 and the side wall lower end portion 11a is placed thereon, so that a predetermined gap is provided between the bottom surface 21a and the side wall lower end portion 11a. Is a member for holding the sheet, and is made of a metal member (for example, SS steel) having a predetermined thickness. In the present embodiment, the spacing member 30 is formed with a thickness of 50 to 100 mm so that a spacing of 50 to 100 mm is formed from the bottom surface 21a to the bottom surface of the side wall lower end portion 11a.

Further, as shown in FIG. 5A, the spacing members 30 are arranged on the side wall portions 11 on both sides in the width direction W of the gate-shaped block 10 and have a predetermined spacing in the extension direction L. 2 are arranged with a space therebetween, that is, at least four spacing members 30 are arranged for one gate-shaped block 10.

The liquid filling and hardening member 40 is a hardening member that is filled and hardened between the bottom surface 21a and the inner side surface 21b of the arrangement recess 21 and the outer surface of the side wall lower end portion 11a, and has a compressive strength of 60 to 90 N/mm ² . At the same time, the elastic modulus is 1.8×10 ^{4 to} 2.1×10 ⁴ N/mm ² . That is, the cured liquid filling and curing member 40 has a higher compressive strength and a lower elastic modulus than the side wall lower end portion 11a and the supporting base member 20.

The liquid filling/hardening member 40 is made of a liquid filling/hardening material that is liquid at the time of filling and that develops strength over time and hardens. In this embodiment, non-shrink mortar is used.

Next, a method for constructing the portal structure 1 configured as described above will be described with reference to FIGS. 3 to 6.
First, in constructing the gate-shaped structure 1, a portion where the side wall portion 11 is arranged in the construction portion of the gate-shaped structure 1 is dug along the extension direction L, and as shown in FIG. Laying green stone and placing concrete foundation on it to construct the foundation (foundation: step s1).

Then, the supporting base member 20 is installed on the constructed foundation so as to match the height and the passage (step s2: refer to FIG. 4B), and the spacing member 30 is provided at a predetermined position in the arrangement recess 21 of the supporting base member 20. Are arranged (step s3). Specifically, as shown in FIG. 5A, the gate block 10 is arranged at a position close to both ends of the side wall portions 11 in the extension direction L. At this time, leveling is performed by accurately adjusting the height of the spacing member 30.

The gate block 10 is installed on the four spacing members 30 which are arranged at predetermined positions in the arrangement recess 21 and whose level is adjusted at a predetermined height (step s4: see FIG. 5(b)). At this time, the inner side surface 21b of the arrangement concave portion 21 and the side surface of the side wall lower end portion 11a are installed such that the distance between them is substantially equal on both sides in the width direction W.

Since the side wall lower end portion 11a is placed on the spacing member 30 arranged on the bottom surface 21a of the arrangement concave portion 21, between the bottom surface 21a of the arrangement concave portion 21 and the bottom surface of the side wall lower end portion 11a, The spacing member 30 forms a gap having a predetermined height.

In this way, it is repeated until the predetermined number of the gate-shaped blocks 10 are installed along the extension direction L (step s5: No), and after the installation of the predetermined number of the gate-shaped blocks 10 is completed (step s5: Yes), the placement recess 21 is formed. The liquid filler is filled between the bottom surface 21a and the inner side surface 21b of the above and the outer surface of the side wall lower end portion 11a (step s6: see FIG. 6(b)).

At this time, on both sides of the side wall lower end portion 11a, as shown in FIG. 6(b), a predetermined gap is formed between the side wall lower end portion 11a and the inner side surface 21b. Since the bottom surface of the lower end portion 11a and the bottom surface 21a of the arrangement recess 21 are communicated with each other, the liquid filler is injected and filled from the gap between the lower end portion 11a of the side wall portion and the inner side surface 21b. The liquid filling material is filled to the same height as the upper surface 20a of the supporting base member 20.

Then, when the liquid filling material filled between the lower end portion 11a of the side wall portion and the arrangement recess 21 is cured and the required strength is developed, the installation of the gate-shaped block 10 is completed, and further, for example, the interior or the wellhead Finishing, construction of the portal structure 1 is completed.

In the above description, after all the gate-shaped blocks 10 have been installed (step s5) and the liquid filler has been filled (step s6), a plurality of or one gate-shaped block 10 has been installed and then the corresponding portion has been installed. The liquid filler may be filled with the liquid (step s5). In this case, the installation of the next portal block 10 may be completed even before the curing of the liquid filler in the portal block 10 is completed.

Further, the plurality of gate-shaped blocks 10 forming the gate-shaped structure 1 may or may not be connected in the extension direction L. In the case of connecting, the gate blocks 10 adjacent to each other in the extension direction L may be simply connected by a connecting plate or the like, or a plurality of gate blocks 10 arranged along the extension direction L may be structurally integrated. May be.
Further, the gate-shaped structure 1 may be configured by a single precast gate-shaped block 10.

As described above, in the gate-shaped structure 1, the precast gate-shaped block 10 that forms a gate shape with the side wall 11 and the floor slab 12, and the arrangement recess 21 in which the side wall lower end portion 11a is arranged have the extension direction L. A support base member 20 formed along the upper surface 20a for supporting the side wall lower end portion 11a, and a liquid filling and hardening member 40 filled and cured between the side wall lower end portion 11a arranged in the arrangement recess 21. And the gate-shaped blocks 10 are arranged in the extension direction L to form the gate-shaped structure 1, so that the gate-shaped structure 1 having a desired extension can be constructed.

Further, the support base member 20 is arranged along the extension direction L, and the side wall portion 11 and the floor slab portion 12 form a gate shape in the arrangement recess 21 formed on the upper surface 20 a of the support base member 20. The side wall lower end portion 11a of the gate-shaped block 10 is arranged, a liquid filling member is filled between the arranged side wall lower end portion 11a and the arranged recess portion 21, and the filled liquid filling material is cured to thereby liquid fill and cure. Since the gate-shaped structure 1 that constitutes the member 40 and supports the gate block 10 with the support base member 20 is constructed, the side wall lower end is used as the support structure for supporting the side wall lower end portion 11a with the support base member 20. The support function can be appropriately exerted under the constraint condition as the hinge support structure that restrains the displacement of the portion 11a and allows the rotation of the side wall portion 11. Therefore, it is possible to construct a highly safe gate-shaped structure 1 in which the analysis model and the actual structure have a high consistency in displacement and behavior.

Further, since the liquid filling/hardening member 40 has a high compressive strength and a low elastic coefficient with respect to the side wall portion 11 and the supporting base member 20, the liquid filling and curing member 40 has a high compressive strength with respect to the side wall portion 11 and the supporting base member 20. The curing member 40 appropriately restrains the displacement of the lower end portion 11a of the side wall portion, and since the elastic coefficient is low, the rotation of the side wall portion 11 can be appropriately allowed.

Moreover, the general compressive strength of the precast gate type block 10 is 30 to 40 N/mm ² , and the general compressive strength of the supporting base member 20 formed by casting in situ is 18 to 24 N/mm ² . On the other hand, the liquid filling and hardening member 40 having a compressive strength of 60 to 90 N/mm ² has a sufficiently high strength, so that the displacement of the side wall lower end portion 11a can be appropriately restrained.

Further, the general elastic modulus of the precast gate type block 10 is 2.8×10 ^{4 to} 3.1×10 ⁴ N/mm ² , and the general type of the supporting base member 20 formed by casting in place is common. Liquid having an elastic coefficient of 2.2×10 ^{4 to} 2.5×10 ⁴ N/mm ² , while having an elastic coefficient of 1.8×10 ^{4 to} 2.1×10 ⁴ N/mm ^2. Since the amount of deformation of the filling and hardening member 40 is large with respect to the same load, that is, the deformability is high, the rotation of the side wall portion 11 can be allowed.

Further, since the thickness of the liquid filling and hardening member 40 formed in the lateral portion between the outer surface of the lower end portion 11a of the side wall portion and the bottom surface 21a and the inner side surface 21b of the placement recess 21 is 50 to 100 mm, the durability is improved. Therefore, the supporting function can be appropriately exerted under the constraint condition of the hinge supporting structure. Therefore, it is possible to construct a highly safe gate-shaped structure 1 in which the analysis model and the actual structure have a high degree of consistency in displacement and behavior.

More specifically, when the lateral thickness of the liquid filling/hardening member 40 is less than 50 mm, the stress level with respect to the amount of deformation due to displacement/rotation exceeds the allowable value of the liquid filling/hardening member 40, causing long-term cracking. It is difficult to maintain a simple hinge mechanism.

Further, when the thickness of the liquid filling and hardening member 40 in the depth direction is less than 50 mm between the outer surface of the lower end portion 11a of the side wall portion and the bottom surface 21a and the inner side surface 21b of the arrangement recess 21, short-term stress is liquid due to horizontal displacement. The filling and hardening member 40 may be damaged beyond the allowable value, and when the thickness of the liquid filling and hardening member 40 is larger than 100 mm, the stress due to member rotation may exceed the allowable value of the liquid filling and hardening member 40 and may be damaged. is there.

On the other hand, by setting the thickness of the liquid filling/hardening member 40 to 50 to 100 mm, it is possible to obtain an appropriate supporting state for a long period of time due to the stress of the liquid filling/hardening member 40 during horizontal displacement and member rotation.

Further, since the spacing member 30 having a predetermined height is disposed at a predetermined distance in the extension direction L between the bottom surface of the lower end portion 11 a of the side wall portion and the bottom surface 21 a of the placement recess 21, the liquid filling and hardening member 40. Can be reliably configured.

More specifically, since the spacing member 30 can secure a space between the bottom surface of the side wall lower end portion 11a and the bottom surface 21a of the arrangement recess 21, the liquid filling material forming the liquid filling/hardening member 40 can be securely filled through the space. It is possible to form a dense liquid filling and hardening member 40 by filling the above.

Further, by disposing the space retaining member 30, a desired space can be secured between the bottom surface 21a of the disposing recess 21 and the bottom surface of the side wall lower end portion 11a, so that a hinge support structure having an appropriate rotation function is configured. You can

Further, since the distance between the inner surfaces of the side wall portions 11 is 1.0 to 5.0 times the height of the inner surface of the side wall portions 11 in the gate-shaped block 10, it is appropriate for the constraint condition as the hinge support structure. It is possible to construct the portal structure 1 that is supported by a structure that exerts a supporting function, has a high degree of consistency in displacement and behavior between the analytical model and the actual structure, and is highly safe.

More specifically, when the distance between the inner surfaces of the side wall portions 11 is less than 1.0 times the height of the inner surface of the side wall portions 11, that is, in the vertically long gate-shaped structure in which the height direction is longer than the width direction. In some cases, the rotation of the side wall portion 11 itself increases, and the hinge support structure that supports the side wall portion lower end portion 11a does not function sufficiently. On the contrary, when the distance between the inner surfaces of the side wall portions 11 is larger than 5.0 times the inner surface height of the side wall portions 11, that is, the width direction W is longer than the height direction H, the horizontally long gate-shaped structure. In this case, since the floor slab portion 12 is deformed more than the side wall portion 11, the horizontal force at the lower end portion 11a of the side wall portion becomes too large, which may exceed the allowable range for the hinge support structure.

On the other hand, when the distance between the inner surfaces of the side wall portions 11 is 1.0 to 5.0 times the height of the inner surface of the side wall portions 11, the side wall portions 11 and the floor slab portion 12 are deformed. Since the displacement and rotation of the side wall lower end portion 11a are well balanced and the side wall lower end portion 11a can be properly supported under the constraint condition as the hinge supporting structure for supporting the side wall lower end portion 11a, the displacement and behavior between the analytical model and the actual structure, etc. It is possible to construct the gate-type structure 1 having high consistency and high safety.

Next, the effect confirmation test performed on the portal structure 1 having the above-described effects will be described.
As a test body, the gate-shaped structure 1 of W2000×H750 was constructed with one gate-shaped block 10, a vertical force loading test was performed, and the above-mentioned effect was confirmed by comparing the test result and the analysis result.

In addition, a general-purpose model was extracted from the construction results of the bevel gate culvert method study group, and the load angle was calculated by reproducing the rotation angle of the hinge part under the design conditions specified in the product standard of the study group, and the constant load value was calculated. The test was conducted at 280.0 kN and an earthquake load of 430.0 kN.

As a result, it was confirmed that the stress distribution generated in the gate block 10 due to the vertical load is close to the stress distribution when the sidewall lower end portion 11a is modeled and analyzed as a hinge support structure.
Further, it was confirmed that the horizontal displacement caused by the vertical load on the lower end portion 11a of the side wall of the gate block 10 was 0.0 to 0.09 mm, which was extremely small, and the horizontal displacement was sufficiently restrained.

As described above, according to the above-described effect confirmation test, the gate-shaped structure 1 having the above-described configuration matches the displacement and behavior of the actual structure with the result obtained by modeling the side wall lower end portion 11a as a hinge supporting structure. It was confirmed that the property is high.

The present invention is not limited to the configurations of the above-described embodiments, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.
For example, although the gate-shaped block 10 having the gate-shaped structure including the side wall portion 11 and the floor slab 12 is used, the left and right side wall portions 11 may have different lengths, or the gate-shaped block 10. Part of the gate shape may be made of cast-in-place concrete.

Furthermore, in the above description, the liquid filling and hardening member 40 is configured by hardening non-shrink mortar, but if it is a filling material that can be filled in a filling portion and hardens after filling to develop strength, it has high strength. It may be composed of a cement-based filler such as cement paste or a resin-based filler having desired properties such as durability and strength.

DESCRIPTION OF SYMBOLS 1... Gate-type structure 10... Gate-type block 11... Side wall 11a... Side wall lower end 12... Floor slab 20... Support base member 20a... Upper surface 21... Arrangement recess 21a... Bottom surface 21b... Inner side surface 30... Spacing member 40... Liquid filling hardening member L... Extension direction

Claims (10)

A precast gate type block that forms a gate type with the side wall and the floor slab,
A support base member for supporting the lower end portion of the side wall, in which an arrangement recess in which the lower end portion of the side wall portion is arranged is formed on the upper surface along the extension direction;
In the arrangement concave portion, a liquid filling and hardening member filled and hardened between the arranged lower end portion of the side wall portion ,
A gate-type structure in which a spacing member having a predetermined height is disposed at a predetermined distance in the extension direction between a bottom surface of the lower end portion of the side wall portion and a bottom surface of the placement recess . The gate-type structure according to claim 1, wherein the liquid filling and hardening member has a high compressive strength and a low elastic coefficient with respect to the side wall portion and the supporting base member. The gate-shaped structure according to claim ² , wherein the liquid filling and hardening member has a compressive strength of 60 to 90 N/mm ² . The portal structure according to claim 2 or 3, wherein the liquid filling and curing member has an elastic modulus of 1.8 × 10 ^{4 to} 2.1 × 10 ⁴ N/mm ² . The thickness of the liquid filling/hardening member formed in a lateral portion between the outer surface of the lower end portion of the side wall portion and the inner surface of the arrangement recess is 50 to 100 mm. Gate-shaped structure. The gate-shaped structure according to any one of claims 1 to 5 , wherein a distance between the inner surfaces of the side wall portion is 1.0 to 5.0 times the height of the inner surface of the side wall portion. The gate-shaped structure according to any one of claims 1 to 6 , wherein a plurality of the gate-shaped blocks are arranged in the extension direction. Arrange the supporting base member along the extension direction of the gate structure,
In the arrangement recess formed on the upper surface of the supporting base member, the lower end portion of the side wall portion of the gate block made of precast which forms a gate shape with the side wall portion and the floor slab is arranged,
In the arrangement recess, filled with a liquid charge Hamazai between the arranged the side wall lower end portion,
A liquid filling and hardening member is formed by hardening the filled liquid filling material, and the gate block is supported by the supporting base member ,
A method for constructing a gate-shaped structure, in which a spacing member having a predetermined height is disposed between the bottom surface of the lower end portion of the side wall portion and the bottom surface of the disposing recess at predetermined intervals in the extension direction . The method for constructing a gate-shaped structure according to claim 8 , wherein a side portion between the outer surface of the lower end portion of the side wall portion and the inner surface of the arrangement recess is 50 to 100 mm. Method for constructing a door-shaped structure according to claim 8 or 9 wherein the gate type block, a plurality of arranged in the extension direction.

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