JP2017218848A - Gate-shaped structure and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gate-shaped structure consistent with displacement and behavior in analytic model, and construction method thereof.SOLUTION: A gate-shaped structure 1 is constituted of including: a precast gate shaped block 10 which forms a gate shape with a pair of side wall parts 11 and a floor slab part 12; a support base member 20 in which a concave 21 is formed in an upper plane 20a along an extension direction L, in which a lower end part 11a of the side wall part is disposed and supported thereby; and a liquid filling curable member 40 which is filled in concave 21 between the lower end part 11a of the disposed side wall.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a portal structure having a structure in which a precast portal block is supported by a support base member, and a construction method thereof.

  Conventionally, in bridges and underpass structures that cross roads, etc., understands of about 3.0 to 15.0 m are used instead of underdrain structures such as box culverts, and in the inside of underdrain structures When there are existing facilities, gate-type structures may be used.

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

  Furthermore, in recent years, it is also necessary to perform an analysis that assumes an earthquake, and since it is becoming increasingly complex, if the consistency between the analysis model and the actual structure in terms of displacement and behavior is reduced, the safety of the actual structure will be reduced. There was also a risk of impact.

  Specifically, in the analysis model, when the support structure of the lower end portion of the side wall is modeled as a hinge support structure that constrains the displacement of the fulcrum and allows the rotation of the member, the support structure of the lower end portion of the side wall of the actual structure is Therefore, it is necessary to exhibit the support function under the constraint condition as the hinge support structure in the analysis model.

  For example, as a general hinge support structure in an actual structure, in Patent Document 1, an upright member is fixed, and a support structure 100 called a menase hinge that forms a plastic hinge at a joint portion at a lower end portion of the member (FIG. 7 (a ))) Is described, but the consistency between the analysis model and the actual structure was not high in terms of displacement and behavior.

  Further, in the structure 200 using the precast block, there is a support structure 210 (see FIG. 7B) as disclosed in Patent Document 2 as a support portion that becomes a hinge support structure. As shown in FIG. 7C, the joint material 220 is installed on the side surface of the lower end portion 201 of the support base member 200, so that the displacement of the member required to function as a hinge support structure is restricted. The restraint effect in the horizontal direction is insufficient, and in particular, when a large horizontal force or vertical force is applied, it is expected that the displacement and behavior of the analysis model and the actual structure will be greatly different.

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

  Accordingly, an object of the present invention is to provide a portal structure that is highly consistent with displacement and behavior in an analysis model, and a construction method thereof.

  According to the present invention, a precast gate-shaped block that forms a gate shape with a side wall portion and a floor slab portion, and an arrangement recess in which the lower end portion of the side wall portion is arranged are formed on the upper surface along the extending direction, and the lower end of the side wall portion A gate-type structure composed of a supporting base member that supports a portion and a liquid filling and curing member that is filled and cured between the lower end portion of the side wall portion that is disposed in the placement recess. .

  Moreover, this invention arrange | positions a support base member along the extension direction of a portal type structure, and comprises a gate type | mold by the side wall part and a floor slab part in the arrangement | positioning recessed part formed in the upper surface of this support base member. The lower end portion of the side wall portion of the precast gate-shaped block is arranged, and the liquid filling member is filled in the arrangement recess between the lower end portion of the arranged side wall portion, and the filled liquid filling material is cured to be liquid. It is a construction method of a gate-type structure that constitutes a filling and hardening member and supports the gate-type block with the support base member.

The lower end portion of the side wall portion indicates not only the lower end of the side wall portion but also a region having a predetermined height from the lower end.
The support base member includes a member formed by spot casting, a precast member, or a member constructed by combining a precast member and a spot casting member as long as the lower end portion of the side wall can be supported.

  The liquid filling and curing member is a liquid or gel that can be filled in a filling location, and is a filler that is cured after filling to develop strength, such as cement paste such as high strength cement paste, mortar such as high strength mortar, Alternatively, it can be a cement-based filler such as concrete, or a resin-based filler having desired properties such as durability and strength.

  The portal structure may be configured by a single precast portal block, but may be configured by a plurality of portal blocks arranged along the extending direction. Further, the plurality of portal blocks arranged along the extending direction may be connected in the extending direction to be structurally integrated, or may be simply connected, or may be a structure that is not connected. The portal structure may be composed only of the portal block, but a part thereof may be composed of cast-in concrete.

  According to the present invention, as a support structure for supporting the lower end portion of the side wall portion with the support base member, the displacement of the lower end portion of the side wall portion is restrained, and the restraint condition as a hinge support structure that allows the rotation of the side wall portion is appropriately set. Support function can be demonstrated. Therefore, it is possible to construct a gate-type structure with high consistency of the displacement and behavior between the analysis model and the actual structure and high safety.

As an aspect of the present invention, the liquid filling and curing member is characterized in that it has a high compressive strength and a low elastic modulus relative to the side wall portion and the support base member.
According to the present invention, the liquid filling and curing member having a high compressive strength with respect to the side wall portion and the support base member appropriately restrains the displacement of the lower end portion of the side wall portion and has a low elastic coefficient. Rotation can be allowed appropriately.

As an aspect of the present invention, the compressive strength of the liquid filling and curing member can be set to 60 to 90 N / mm ² .
According to the present invention, the general compressive strength of the precast portal block is 30 to 40 N / mm ² and the general compressive strength of the support base member is 18 to 24 N / mm ² . Since the liquid filling and hardening member having a compressive strength of 60 to 90 N / mm ² is sufficiently high in strength, it can appropriately restrain the displacement of the lower end portion of the side wall portion.

As an aspect of the present invention, the liquid filling and curing member may have an elastic modulus of 1.8 × 10 ^{4 to} 2.1 × 10 ⁴ N / mm ² .
According to the present invention, the general elastic modulus of the precast portal block is 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 deformation amount with respect to the load is large, that is, the deformability is high, the side wall portion can be allowed to rotate.

Moreover, as an aspect of the present invention, the thickness of the liquid filling and curing member formed on the side 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, there is durability, and a support function can be appropriately exhibited under the constraint conditions as the hinge support structure. Therefore, it is possible to construct a gate-type structure with high consistency of the displacement and behavior between the analysis model and the actual structure and high safety.

More specifically, when the lateral thickness of the liquid filling / curing member is less than 50 mm, the degree of stress with respect to the amount of deformation due to displacement / rotation exceeds the allowable value of the liquid filling / curing member, and cracks occur for a long time. 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 support state due to the stress of the liquid filling and hardening member in horizontal displacement and member rotation over a long period of time.

Further, as an aspect of the present invention, a spacing member having a predetermined height may be disposed at a predetermined interval in the extending direction between the bottom surface of the lower end portion of the side wall portion and the bottom surface of the disposition recess.
According to the present invention, the liquid filling and curing member can be reliably configured.

  More specifically, since the space can be secured between the bottom surface of the lower end portion of the side wall and the bottom surface of the placement recess by the space retaining material, the liquid filling material constituting the liquid filling and hardening member is reliably filled through the space. In addition, the dense liquid filling and hardening member can be formed.

  Furthermore, since a desired space can be secured between the bottom surface of the placement recess and the bottom surface of the lower end portion of the side wall by arranging the spacing member, a hinge support structure having an appropriate rotation function can be configured.

Moreover, as an aspect of this invention, the space | interval of the inner surfaces of the said side wall part can be made into the range of 1.0 to 5.0 times with respect to the inner surface height of the said side wall part.
According to the present invention, a gate-type structure that is supported by a structure that appropriately exhibits a support function under the constraint condition as a hinge support structure, has high consistency in displacement and behavior between the analysis model and the 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 inner surface height of the side wall portions, that is, in a vertically long portal type structure whose height direction is longer than the width direction. In some cases, the rotation of the side wall itself increases, and the hinge support structure that supports the lower end of the side wall does not function sufficiently. Conversely, when the distance between the inner surfaces of the side wall portions is larger than 5.0 times the inner surface height of the side wall portions, that is, a laterally long portal structure having a long width direction with respect to the height direction. In this case, since the deformation of the floor slab itself is larger than that of the side wall due to the influence of the vertical force, the horizontal force at the lower end of the side wall is excessively large, which may exceed the allowable range for the hinge support structure.

  On the other hand, with respect to the height of the inner surface of the side wall portion, the distance between the inner surfaces of the side wall portions is in the range of 1.0 to 5.0 times, so that the deformation of the side wall portion and the floor slab portion, and the side wall Displacement and rotation at the lower end of the section are balanced and can be properly supported by the restraint conditions as a hinge support structure that supports the lower end of the side wall, so that the consistency of displacement and behavior between the analysis model and the actual structure is It is possible to build a gate structure that is high and highly safe.

As an aspect of the present invention, a plurality of the portal blocks can be arranged in the extending 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 having high consistency with displacement and behavior in an analysis model and a method for constructing the same.

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

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

  FIG. 1 is a partial perspective view of the portal structure 1, and FIG. 2 is an explanatory diagram of the portal structure 1. 2A shows a cross-sectional view of the gate-type structure 1. More specifically, the left half of the cross-sectional view shows the cross-sectional view along the line aa in FIG. 1, and the right half shows the cross-sectional view along the line bb in FIG. The figure is shown.

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

  3 shows a construction flow diagram of the gate-type structure 1, FIGS. 4 and 5 show construction explanatory diagrams of the gate-type structure 1, and FIG. 6 shows an explanatory diagram of the gate-type structure 1. FIG. . More specifically, FIG. 4 (a) shows the foundation work, FIG. 4 (b) shows the installation of the support foundation member 20, and FIG. 5 (a) shows the spacing retaining material for the arrangement recess 21 of the support foundation member 20. FIG. 5B illustrates the installation of the portal block 10. 6A illustrates the filling of the liquid filler, and FIG. 6B illustrates a cross-sectional view illustrating the filling of the liquid filler.

The gate-type structure 1 is a concrete structure having a gate-shaped cross section having an internal space with a side wall portion and a floor slab portion, and has a predetermined length in the extending direction L.
More specifically, the portal structure 1 includes a plurality of precast portal blocks 10 arranged in the extending direction L, and a lower end portion 11a of the sidewall portion 11 of the portal block 10 (hereinafter referred to as a sidewall portion lower end portion 11a). A support base member 20 that supports the support base member 20, a spacing member 30 placed in the placement recess 21 of the support base member 20, and the periphery of the lower end portion 11 a of the side wall portion of the portal block 10 in the placement recess 21 of the support base member 20. It is a concrete structure with a gate-shaped section having an internal space.

  The portal block 10 includes a side wall portion 11 and a floor slab portion 12, and the distance between the inner surfaces of the side wall portions 11 with respect to the height on the inner surface side of the side wall portion 11 (length in the height direction H). It is a frontal portal type shape whose (length in the width direction W) is in the range of 1.0 to 5.0 times, and is a block having a predetermined length in the extending 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-shaped blocks 10 configured in this way are arranged in the extending direction L and are configured to be connectable by a connecting jig (not shown).

The support base member 20 that supports the side wall portion lower end portion 11a of the portal block 10 has a horizontally long rectangular shape in front view, which is long in the extending direction L, and has a compressive strength of 18 to 24 N / mm ² and an elastic coefficient of 2. It is a member made of cast-in-place concrete that is 2 × 10 ^{4 to} 2.5 × 10 ⁴ N / mm ² , and an arrangement recess 21 that allows loose fitting of the lower end portion 11a of the side wall portion is formed along the extending direction L on the upper surface 20a. Is formed.

  The arrangement recess 21 formed in a concave shape with respect to the upper surface 20a of the support base member 20 is wider than the width of the side wall lower end portion 11a, and is one of the side wall lower end portions 11a arranged at a predetermined interval from the bottom surface 21a. It is a recessed part of the rectangular cross-sectional shape of the depth where a part is embedded.

  In the present embodiment, the interval 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 in the center of the arrangement recess 21 in the width direction W. It is formed with a length in the width direction W.

  The depth from the bottom surface 21a to the top surface 20a (the length in the height direction H) is 50 to 100 mm from the bottom surface 21a to the bottom surface of the side wall lower end portion 11a, and from the bottom surface 21a. A side wall lower end portion 11a arranged at a predetermined interval 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 sidewall portion lower end portion 11a is placed thereon, whereby a predetermined spacing is provided between the bottom surface 21a and the bottom surface of the sidewall portion lower end portion 11a. 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 member 30 is disposed with respect to the side wall portions 11 on both sides in the width direction W of the portal-shaped gate-shaped block 10 and has a predetermined spacing in the extending direction L. Are spaced apart from each other, that is, at least four spacing members 30 are disposed with respect to one portal block 10.

The liquid filling and curing member 40 is a cured member that is filled and cured between the bottom surface 21a and the inner side surface 21b of the arrangement recess 21 and the outer surface of the side wall portion 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 support base member 20.

  The liquid filling / curing member 40 is in a liquid state at the time of filling, and is composed of a liquid filling / curing material that develops strength over time and cures. In this embodiment, non-shrink mortar is used.

Next, a method for constructing the gate-type structure 1 configured as described above will be described with reference to FIGS.
First, in constructing the portal structure 1, a place where the side wall portion 11 is arranged in the construction place of the portal structure 1 is dug along the extending direction L, and as shown in FIG. A foundation is constructed by laying a grindstone and placing foundation concrete on it (foundation: step s1).

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

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

  In addition, since the side wall part lower end part 11a is mounted on the space | interval holding | maintenance material 30 arrange | positioned at the bottom face 21a of the arrangement | positioning recessed part 21, between the bottom face 21a of the arrangement | positioning recessed part 21 and the bottom face of the side wall part lower end part 11a, A gap having a predetermined height is formed by the spacing member 30.

  In this way, until the predetermined number of portal blocks 10 are installed along the extending direction L (step s5: No), after the installation of the predetermined number of portal blocks 10 is completed (step s5: Yes), the arrangement recess 21 A liquid filler is filled between the bottom surface 21a and the inner side surface 21b and the outer surface of the side wall lower end portion 11a (step s6: see FIG. 6B).

  At this time, as shown in FIG. 6B, a gap with a predetermined interval is formed between the side wall lower end portion 11a and the inner side surface 21b on both sides of the side wall lower end portion 11a. Since communication is established between the bottom surface of the lower end portion 11a and the bottom surface 21a of the placement recess 21, the liquid filler is injected and filled from the gap between the lower end portion 11a of the side wall and the inner side surface 21b. The liquid filler is filled up to the same height as the upper surface 20a of the support base member 20.

  Then, when the liquid filler filled between the side wall lower end portion 11a and the arrangement recess 21 is hardened and a required strength is developed, the installation of the gate block 10 is completed. Finish and complete the construction of the portal structure 1.

  In the above description, after all the portal blocks 10 have been installed (step s5), the liquid filler has been filled (step s6). Then, a liquid filler may be filled (step s5). In this case, the installation of the next portal block 10 may be completed even before the liquid filler of the portal block 10 is cured.

Further, the plurality of portal blocks 10 constituting the portal structure 1 may or may not be coupled in the extending direction L. In the case of connection, the gate blocks 10 adjacent in the extension direction L may be simply connected with a connecting plate or the like, or a plurality of the gate blocks 10 arranged along the extension direction L are structurally integrated. May be.
Moreover, you may comprise the gate-type structure 1 with the gate-shaped block 10 single-piece made from a precast.

  As described above, the gate-type structure 1 includes the precast gate-type block 10 that forms the gate shape with the side wall portion 11 and the floor slab portion 12, and the disposition concave portion 21 in which the side wall portion lower end portion 11 a is arranged in the extending direction L. A support base member 20 that is formed on the upper surface 20a and supports the side wall portion lower end portion 11a, and a liquid filling and curing member 40 that is filled and cured between the disposed side wall portion lower end portion 11a in the arrangement recess 21; Since the gate-type structure 1 is formed by arranging a plurality of the gate-type blocks 10 in the extension direction L, the gate-type structure 1 having a desired extension can be constructed.

  Further, the support base member 20 is disposed along the extending direction L, and a precast made of a gate shape is formed by the side wall portion 11 and the floor slab portion 12 in the disposition concave portion 21 formed on the upper surface 20a of the support base member 20. The side wall portion lower end portion 11a of the gate block 10 is disposed, and the liquid filling member is filled between the arranged lower wall portion 11a and the disposed side wall portion lower end portion 11a, and the filled liquid filling material is cured to be liquid filling hardening. Since the gate-type structure 1 which comprises the member 40 and supports the gate-type block 10 with the support base member 20 is constructed, the side wall portion lower end is used as a support structure for supporting the side wall lower end portion 11a with the support base member 20. The support function can be appropriately exhibited under the restraint conditions as a hinge support structure that restrains the displacement of the portion 11a and allows the side wall portion 11 to rotate. Therefore, it is possible to construct the gate-type structure 1 having high consistency in the displacement and behavior between the analysis model and the actual structure and high safety.

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

Moreover, the general compressive strength of the portal block 10 made from a precast is 30-40 N / mm < ² >, The general compressive strength of the support base member 20 comprised by on-site strike is 18-24 N / mm < ² >. On the other hand, the liquid filling and curing member 40 having a compressive strength of 60 to 90 N / mm ² is sufficiently high in strength, and can appropriately restrain the displacement of the side wall portion lower end portion 11a.

In addition, the general elastic modulus of the precast portal block 10 is 2.8 × 10 ^{4 to} 3.1 × 10 ⁴ N / mm ² , and the general structure of the support base member 20 configured by spotting is generally used. The elastic modulus is 2.2 × 10 ^{4 to} 2.5 × 10 ⁴ N / mm ² , whereas the elastic modulus is 1.8 × 10 ^{4 to} 2.1 × 10 ⁴ N / mm ^2. Since the filling and curing member 40 has a large amount of deformation with respect to the same load, that is, has high deformability, the side wall portion 11 can be allowed to rotate.

  Moreover, since the thickness of the liquid filling and curing member 40 formed on the side portion between the outer surface of the side wall lower end portion 11a and the bottom surface 21a and the inner side surface 21b of the arrangement recess 21 is 50 to 100 mm, durability Therefore, the support function can be appropriately exhibited under the constraint conditions as the hinge support structure. Therefore, it is possible to construct the gate-type structure 1 having high consistency in the displacement and behavior between the analysis model and the actual structure and high safety.

  More specifically, when the lateral thickness of the liquid filling / curing member 40 is less than 50 mm, the degree of stress with respect to the amount of deformation due to displacement / rotation exceeds the allowable value of the liquid filling / curing member 40, resulting in long-term occurrence of cracks, etc. It is difficult to maintain a simple hinge mechanism.

  Moreover, 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 side wall lower end portion 11a and the bottom surface 21a and the inner surface 21b of the arrangement recess 21, the short-term stress is liquefied due to horizontal displacement. If the thickness of the liquid filling and curing member 40 is greater than 100 mm, the stress due to the rotation of the member may exceed the allowable value of the liquid filling and curing member 40 and cause damage. is there.

  On the other hand, by setting the thickness of the liquid filling and hardening member 40 to 50 to 100 mm, an appropriate support state due to the stress of the liquid filling and hardening member 40 in horizontal displacement and member rotation can be obtained over a long period of time.

  In addition, since the interval holding member 30 having a predetermined height is disposed at a predetermined interval in the extending direction L between the bottom surface of the side wall portion lower end portion 11a and the bottom surface 21a of the disposing recess 21, the liquid filling and curing member 40 is disposed. Can be reliably configured.

  More specifically, since the space can be secured between the bottom surface of the side wall lower end portion 11a and the bottom surface 21a of the arrangement recess 21 by the space retaining member 30, the liquid filling material constituting the liquid filling and curing member 40 is surely secured through the space. The dense liquid filling and curing member 40 can be configured.

  Furthermore, by arranging the spacing member 30, a desired spacing can be secured between the bottom surface 21 a of the placement recess 21 and the bottom surface of the side wall portion lower end portion 11 a, so that a hinge support structure having an appropriate rotation function is configured. Can do.

  Moreover, since the space | interval of the inner surfaces of the side wall part 11 is the range of 1.0 to 5.0 times with respect to the inner surface height of the side wall part 11 in the portal block 10, it is appropriate by the restraint conditions as a hinge support structure. Therefore, it is possible to construct a portal structure 1 that is supported by a structure that exhibits a support function, has high consistency in displacement and behavior between the analysis model and the actual structure, and has high safety.

  More specifically, when the distance between the inner surfaces of the side wall portions 11 is less than 1.0 times the inner surface height of the side wall portions 11, that is, with a vertically long portal structure that is longer in the height direction than in the width direction. In some cases, the rotation of the side wall part 11 itself becomes large, and the hinge support structure that supports the side wall part lower end part 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, a horizontally long gate-shaped structure in which the width direction W is longer than the height direction H. In this case, since the deformation of the floor slab portion 12 becomes larger than that of 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 range allowed as the hinge support structure.

  On the other hand, the deformation of the side wall part 11 and the floor slab part 12 can be achieved by setting the distance between the inner surface of the side wall part 11 to 1.0 to 5.0 times the inner surface height of the side wall part 11. Since the displacement and rotation in the side wall lower end portion 11a are balanced and can be appropriately supported under the constraint condition as a hinge support structure for supporting the side wall lower end portion 11a, the displacement and behavior in the analysis model and the actual structure, etc. Therefore, it is possible to construct the gate-type structure 1 having high consistency and high safety.

Then, the implemented effect confirmation test is demonstrated about the portal structure 1 which has the above effects.
As a test body, the portal structure 1 of W2000 × H750 was constructed with one portal block 10 and 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 portal culvert method, and the load load was calculated by reproducing the rotation angle of the hinge part under the design conditions specified in the product standard of the study group. The test was conducted at 280.0 kN and the loading load during earthquake was 430.0 kN.

As a result, it was confirmed that the stress distribution generated in the portal block 10 due to the vertical load approximates the stress distribution when the side wall lower end portion 11a is modeled and analyzed as a hinge support structure.
Moreover, the horizontal displacement which arises in the side wall part lower end part 11a of the portal block 10 by vertical load is very small with 0.0-0.09 mm, and it has confirmed that the horizontal displacement was fully restrained.

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

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

  Furthermore, in the above description, the liquid filling and curing member 40 is configured by curing the non-shrinkable mortar. However, if the filling material can be filled in the filling portion and is cured after filling to exhibit strength, the strength is high. You may comprise with cement-type fillers, such as a cement paste, and resin-type fillers with desired properties, such as durability and intensity | strength.

DESCRIPTION OF SYMBOLS 1 ... Gate-shaped structure 10 ... Gate-shaped block 11 ... Side wall part 11a ... Side wall part lower end part 12 ... Floor slab part 20 ... Supporting base member 20a ... Upper surface 21 ... Arrangement recessed part 21a ... Bottom 21b ... Inner side surface 30 ... Space | interval holding material 40 ... Liquid filling and hardening member L ... Extension direction

Claims (12)

A precast gate-shaped block that forms a gate shape with a side wall portion and a floor slab portion; and
An arrangement recess in which the lower end portion of the side wall portion is arranged is formed on the upper surface along the extending direction, and a support base member that supports the lower end portion of the side wall portion,
A portal-type structure comprising a liquid filling and curing member filled and cured between the disposed lower end portions of the side wall portions in the arrangement recess. 2. The portal structure according to claim 1, wherein the liquid filling and curing member has a high compressive strength and a low elastic modulus with respect to the side wall portion and the support base member. The portal structure according to claim ² , wherein the compressive strength of the liquid filling and curing member is 60 to 90 N / mm2. 4. The portal structure according to claim 2, 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 said liquid filling hardening member formed in the side part between the outer surface of the said side wall part lower end part and the inner surface of the said arrangement | positioning recessed part is 50-100 mm in any one of Claims 1 thru | or 4. Portal structure. 6. The space holding member having a predetermined height is disposed at a predetermined interval in the extending direction between a bottom surface of the lower end portion of the side wall portion and a bottom surface of the arrangement recess. Portal structure. The portal structure according to any one of claims 1 to 6, wherein an interval between the inner surfaces of the side wall portions is in a range of 1.0 to 5.0 times with respect to an inner surface height of the side wall portions. The portal structure according to any one of claims 1 to 7, wherein a plurality of the portal blocks are arranged in the extending direction. Place the supporting foundation member along the extension direction of the portal structure,
In the arrangement recess formed on the upper surface of the support base member, the lower end portion of the side wall portion of the precast gate block that constitutes the gate shape with the side wall portion and the floor slab portion is arranged,
In the arrangement recess, the liquid filling member is filled between the arranged lower end portions of the side wall parts,
A method for constructing a gate-type structure in which the liquid filler is cured by curing the filled liquid filler, and the portal block is supported by the support base member. The method for constructing a gate-type structure according to claim 9, wherein a side portion between the outer surface of the lower end portion of the side wall portion and the inner surface of the placement recess is 50 to 100 mm. 11. The portal structure according to claim 9, wherein a spacing member having a predetermined height is disposed at a predetermined interval in the extending direction between a bottom surface of the lower end portion of the side wall portion and a bottom surface of the disposition recess. Construction method. The method for constructing a portal structure according to any one of claims 9 to 11, wherein a plurality of the portal blocks are arranged in the extending direction.

Images