JP2003160911A - Divided precast structure of gate-shaped structure and construction method for structure using the same structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a divided precast structure of a gate-shaped structure which is excellent in workability, economic efficiency, and reliability in terms of quality, and in which deterioration of load resistance force is suppressed to a minimum, and a construction method for a structure using the same structure. <P>SOLUTION: A hinge joining part is provided to a column constituting the gate-shaped structure or at the intermediate height h<SB>1</SB>of a wall body, a lower structural body and an upper structural body are divided at the position of the hinge joining part, and at least either the lower structural body or the upper structural body is made to be a precast member. The height h<SB>1</SB>of the hinge joining part is provided in the vicinity of the position where elastic energy which is absorbed by the gate-shaped structure is made to be a minimum to expected loads V, H. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention separates a structure into upper and lower parts by inserting a hinge in the middle of a column or a wall portion forming a portal structure such as a portal frame structure in the height direction. The present invention relates to a divided precast structure of a portal structure obtained by precasting a part or all of the above structure and a method of constructing a structure using the divided precast structure.

The present invention is suitable for constructing viaducts, buildings and other structures above existing roads and railways, but the application is not limited to these.

In the present invention, the term "portal structure" is not limited to a portal structure having one span, but a multi-span portal structure having a large number of columns and having a continuous gate structure. Shall be included.

[0004]

2. Description of the Related Art Conventionally, in order to improve workability, economy, and reliability of a structure and to precast a structure, the structure should be separated at a beam-column joint or its vicinity, and precast members should be separated as much as possible. It is generally rigidly joined. However, in that case, there is a problem that the cross section of the joint becomes large and the member cross section becomes large as a whole structure, which impairs the economical efficiency.

It is also conceivable that a pin is joined by interposing a hinge instead of being rigidly joined, but in general, interposing a hinge in an elastic frame structure lowers the rigidity of the entire structure, Since the amount of deformation with respect to the load increases and the elastic energy absorbed by the structure increases, precasting of the rigid frame structure is difficult.

On the other hand, looking at a concrete method of constructing a gate structure, when constructing a viaduct for a road or railway on an existing road or railway, the existing road or railway is cut around and constructed or replaced. It is common to use an overhead line to raise each line.

[0007]

The above-mentioned conventional construction methods have problems that the existing roads and railroads are temporarily cut or constructed line by line, so that the entire construction period is long and the economy is low.

In relation to the portal structure, it is often difficult to make it into a precast product due to the problems of decreased rigidity and increased amount of deformation as described above. There are challenges in reliability.

On the other hand, the inventor of the present application has examined the insertion position of the hinge in the portal structure including multiple spans, and as a result, the deformation amount and the elastic energy absorption of the structure are absorbed for the same horizontal load and vertical load. It was discovered that the amount is almost the same as the rigid frame structure where the joint is rigid, and there is a position suitable for dividing precasting the structure.

Based on the above findings, the present invention is one in which a hinge is provided at a predetermined height in the middle of a pillar or a wall constituting a gate-shaped structure, and the structure is divided into precast parts. It is an object of the present invention to provide a divided precast structure of a portal structure which is excellent in economical efficiency and quality, and which minimizes deterioration of load bearing capacity, and a method of constructing a structure using the structure. .

[0011]

The invention according to claim 1 of the present application provides a hinge joint portion at an intermediate height of a pillar or a wall constituting a portal structure, and the hinge structure is provided with the hinge joint portion. It is a divided precast structure in which the lower structure and the upper structure are divided at the joint position, and at least one of the lower structure and the upper and lower structures is precast, and the position of the hinge joint is set to an expected load. On the other hand, it is provided in the vicinity of a position where the elastic energy absorbed by the gate structure is minimized. The portal structure referred to here is not limited to the one-span structure as described above, but includes a multi-span structure.

By providing the hinge joint at the middle height of the pillar or the wall, the distribution of bending moment acting on the gate structure by predetermined horizontal load and vertical load in design etc. and the amount of deformation of each part can be improved. This is different from the case without hinge joints.

Generally, by interposing the hinge joint, the rigidity of the entire structure is lowered, and the partial bending moment and the amount of deformation are increased. However, the position of the hinge joint is changed with respect to the assumed load. As described in detail later, the maximum bending moment and the amount of displacement can be suppressed to about the same level as when the hinge joint is not provided by providing the gate structure at a position where the elastic energy absorbed is minimized. it can.

The optimum height of the hinge joint varies depending on the load conditions, the frame structure of the structure itself, the material of each member, the cross section, the rigidity, the condition of the joint, etc.
When a hinge joint is provided on the pillar of the portal type ramen,
When the hinge joint is provided on each column of the portal type ramen with one layer and multiple diameters, which is slightly higher than 0.5 times the column height, the span l of the column and the height h of the column are equal (l / In the case of h = 1), the height is 0.538 times the height of the column.

In the present invention, in this way, the hinge joint portion is provided at the middle height of the pillars or the walls constituting the portal structure, and the structure is divided into the lower structure and the upper structure. Since the structural member can be precast at the separating position and no bending moment is generated at the hinge joint, it is sufficient to resist the shearing force, resulting in a compact joint.

Further, by precasting the structural member,
As in the case of precasting general structures, it is possible to improve workability, economic efficiency, and reliability in terms of quality. In addition,
In this case, it is possible to precast all the structural members in which the hinge joints are interposed, but depending on the site conditions, construction conditions, etc., part may be cast-in-place concrete or the like.

The column referred to in the present invention refers to a column of a column portion constituting a frame structure including a bridge pier such as a bridge and a column base, in addition to a column of a building structure. In addition, the wall body includes a wall pillar having a small width to a long wall body continuous in the width direction.

According to a second aspect of the present invention, in the divided precast structure for a portal structure according to the first aspect, the lower structure is made of cast-in-place concrete, and a precast member is used for the upper structure. The case where the structure and the upper structure are connected via the hinge joint is limited.

For example, in some cases, it may be desirable to use cast-in-place concrete for the lower structure in relation to the foundation, and it is easier to install a formwork or the like on the ground as compared with the upper structure. The lower structure is cast-in-place concrete and the upper structure is precast.

The invention according to claim 3 of the present application is a method of constructing a structure using the divided precast structure of the portal structure according to claim 1 or 2, wherein the lower part of the pillar is provided on both sides of the existing structure. Constructing a plurality of lower structures, each side of the existing structure, erected an upper structure made of a precast member including the upper part of the pillar on the lower structure, the lower structure and After constructing a gate-shaped structure as a support structure on both sides of the existing structure by connecting the upper structure via a hinge joint, between the gate-shaped structures on both sides of the existing structure. The present invention is characterized in that an erection structure that extends above the existing structure is erected.

The invention according to claim 3 is the invention according to claim 1 or 2.
The concrete application example of the divided precast structure of the gate type structure according to is limited as a construction method, and the gate type structure as the support structure of the divided precast structure is constructed on both sides of the existing structure. After that, by constructing a structure such as a girder or floor slab on top of it, constructing various structures straddling the existing structure while minimizing the effect on the existing structure. You can

The invention according to claim 4 of the present application is a method of constructing a structure using the divided precast structure of a portal structure according to claim 1 or 2, wherein pillars or walls are provided on both sides of an existing structure. A lower structure constituting a lower part of the body is constructed, and an upper structure made of a precast member including an upper part of the pillar or the wall is erected on the lower structure so as to cross over the existing structure. The lower structure and the upper structure are connected via a hinge joint.

In the invention according to claim 3, first, a gate type structure is constructed in which the divided precast structure is applied to both sides of the existing structure, whereas in claim 4, the gate is applied in which the divided precast structure is applied. The mold structure is constructed so as to directly straddle the existing structure.

In this case, when the gate-shaped structure itself is the final form of the structure, or when a girder, a beam, or a floor slab is installed above the gate-shaped structure, or a structure is further provided above the gate-shaped structure. Various forms are conceivable, such as a form of constructing a framework of objects.

A fifth aspect of the present invention is a method for constructing a structure using the divided precast structure according to the third or fourth aspect, which limits the case where the existing structure is an existing road or railway.

Specifically, there may be mentioned a case of constructing a viaduct such as a road or a railroad on an existing road or a railroad, or a case of constructing a building across the railroad. The construction method of the present invention is used. By doing so, it is possible to carry out the construction while minimizing the lane regulation of the existing road and the railway operation regulation.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 are views for explaining the principle of a divided precast structure for a portal structure according to the present invention.

First, let us consider a case where a hinge is inserted at a predetermined height of two columns of a portal-type rigid frame structure having a span of one layer as shown in FIG. Where span is l (lowercase L),
Height h = h ₁ + h ₂ (h ₁ : height to hinge position, h
₂ : The height from the hinge position to the top of the column), and the vertical load V acts on the beam center and the right horizontal load H acts on the left end of the beam as load conditions.

In order to obtain the height h ₁ that minimizes the elastic energy absorbed by the portal structure at this time, the bending moment and the deformation are obtained by changing h ₁ and the result is, for example, as shown in FIG.

In FIG. 2, the elastic modulus E of the beam portion and the column portion, the width b of the cross section of the member, and the height a in the direction of bending of the cross section of the member are common (thus, the second moment of area I = a ³ b). / 12,
Cross-section area A = ab is common), H / V = 0.5, h ₁
For /h=0.9,h ₁ /h=0.5,h ₁ /h=0.2, in which the deformation due to bending deformation and axial force was subjected to structural analysis by numerical calculation in consideration.

From FIG. 2, h ₁ /h=0.9, h ₁ / h =
In the case of 0.2, the deformation in the horizontal direction becomes considerably large, whereas in the case of h ₁ /h=0.5, the deformation does not increase much as compared with the case without the upper hinge in FIG. I understand.

FIG. 3 shows the relative height h ₁ / h of the hinge and the compliance ratio C when the height of the hinge is variously changed.
It is a graph showing the relationship of / C ₀ . Here, the compliance is defined as the elastic energy absorbed by the structure under a given load, and the compliance ratio C / C ₀ was determined with C ₀ being the compliance when there is no hinge.

In the graph of FIG. 3, the relative height of the hinge when the compliance ratio C / C ₀ is minimum is h
_It becomes _{1 /} h≈0.519, and it can be considered that the elastic energy absorbed by the portal structure is minimized by inserting the hinge at a position slightly above the center height of the column.

Next, regarding the one-layer multi-span ramen structure,
In examining the optimum hinge insertion height, the structural analysis by the same numerical calculation was performed for the infinite span rigid frame structure shown in FIG. Also in this case, the same height h ₁ for each pillar
The hinge shall be inserted into.

In this case, the displacements u and v in the load direction of the load points on which the loads H and V act are obtained as follows.

U = Hh ₁ ³ / 3EI + Hh ₂ ³ / 3EI + Hh ₂ ² l / 12EI (1) v = Vh / EA + Vl ³ / 192EI (2) Here, the horizontal displacement u depends only on the aquatic load H. Then, on the other hand,
The vertical displacement v depends only on the vertical load V.

The height of the hinge h ₁ (= h−h ₂ ).
Since only horizontal displacement u depends on
Is minimized, the compliance (Hu + Vv) / 2 is minimized.

When calculated concretely, the optimum hinge height is obtained by h ₁ / h = (6 + l / h) / (12 + l / h) (3). For example, 1 / h = 1
In the case of, the optimum height of the hinge is h ₁ / h = 7/13 (≈
0.538).

Further, it has been found that when the rigidity of the beam portion of the portal-type rigid frame is higher than the rigidity of the column portion, the height approaches 0.5 times the height of the column.

FIG. 5 shows bending moment and deformation when one hinge is inserted at a position where the compliance C is minimum, for one span.

FIG. 6 is a graph showing the relationship between the relative height h ₁ / h of the hinge and the compliance ratio C / C ₀ when the height of the hinge is variously changed. When considered, it can be seen that the minimum compliance ratio is 1, which is ideally the same compliance as without a hinge.

Although not described here, when the number of spans is gradually increased to 2, 3, 4, ...
The minimum compliance ratio gradually approaches the position for infinite spans.

7 to 11 show an embodiment in which the present invention is applied to a viaduct constructed on an existing road. The bridge pier portion of the viaduct is the lower pier as the lower structure 2 and the precast. The upper structure 3 is divided into upper parts of the pier as a part of the upper structure 3, and the joint 4 between the lower structure 2 and the upper structure 3 is made into a hinge structure, and the height thereof is set to the compliance ratio C / C ₀ as described above. It is set near the minimum, that is, near the position where the elastic energy absorbed by the portal structure is minimized.

The construction procedure of the portal structure of this embodiment is as follows. First, as shown in FIG. 8, the existing road 1
On both sides of the railway (it may be a railway), the substructure 2 as the lower part of the bridge pier is constructed with cast-in-place concrete according to the local situation.

After constructing the lower structure 2, the pier upper part 3a
The upper structure 3 in which the beam portion 3b and the beam portion 3b are integrated as a lightweight precast block is erected at once as shown in FIG. The joint 4 between the lower structure 2 and the upper structure 3 has a hinge structure capable of resisting only shearing force.

After completing the gate-type piers on both sides of the existing road 1, precast transverse girders 5 for receiving the floor slabs are installed as shown in FIG. 10, and the floor slabs 6 are provided thereon as shown in FIG.
Set up.

After a part of the viaduct is completed, the viaduct can be used as a working yard to successively complete the viaduct in the bridge axis direction (see FIG. 7).

FIG. 12 shows an example of a concrete form of the pier portion in the embodiment shown in FIG.
This is the case when the C structure is used.

In this example, the cross-section of the pier portion is a hollow square tubular cross-section, and a plurality of H-shaped steels as axial steel frames 11 are installed at predetermined intervals in the cross-section of the square tubular portion.
2, the brace material 13, the band reinforcing bar material 14 and the like are assembled to form the steel frame of the pier.

The merit of this SRC structure is that the crack dispersibility is good, the estimation formula of reinforced concrete can be applied to estimate the crack width, it is excellent in earthquake resistance, and the ordinary RC is used.
It is possible to estimate the proof strength by theory, and under high axial force, it is possible to demonstrate better seismic performance than the RC structure.

FIG. 13 shows an example of the structure of the joint portion when the structure of FIG. 12 is applied. The H-shaped steels which are the axial steel frames 11 of the lower structure 2 and the upper structure 3 are staggered. They are arranged so that they are fitted together at the joint portion 4 without interfering with each other.

In the embodiment of FIG. 7, the lower structure 2 is made of cast-in-place concrete and the upper structure 3 is made of precast member so that the axial steel frames 11 project from the respective ends, and the space between the two in the joint 4 is formed. Concrete 15 is placed and connected to the void portion.

In this case, the projecting length of the axial steel frame 11 wrapped at the joint 4 is made as short as possible so that the hinge function of the joint 4 is not impaired.

FIG. 14 shows another example of the structure of the joint portion. In the embodiment shown in FIG. 13, H-section steel is used as the axial steel frame 11, whereas in FIG. 14, the axial steel frame 11 is used. A round steel pipe is used as'. The basic idea regarding the pier structure and the structure of the joint portion 4 is the same as in the case of FIG.

FIG. 15 shows another embodiment of the present invention. When constructing a gate-shaped structure so as to straddle an existing road or railroad, first, the earth retaining structure as the lower structure 22 is provided on both sides. Build a wall on which a gate-shaped upper structure 2
As No. 3, a precast concrete block was installed.

The joint portion 24 between the lower structure 22 and the upper structure 23 has a hinge structure, and the height thereof is, as described with reference to FIGS. 1 to 3, a hinge is inserted in the middle of the wall of the gate-shaped ramen. In this case, it is near the position where the elastic energy absorbed by the portal structure is minimized.

FIG. 16 (a) shows a modified example of the embodiment shown in FIG. 15. In the embodiment shown in FIG. 15, when the lower structure 22 and the upper structure 23 are both precast members, or In contrast to the case where only the body is a precast member, in the embodiment of FIG. 16, a footing portion 22a is formed at the lower end of the earth retaining wall as the lower structure 22, and the lower structure 22 is cast-in-place concrete or upper structure 23. Is for precast concrete blocks.

FIG. 16 (b) shows the case of two spans, and the basic form is the same as in the case of FIG. 16 (a).

FIGS. 17 (a) to 17 (c) respectively show a lower structure 22 applicable to the embodiment of the wall type structure shown in FIGS.
2 shows an example of the structure of the joint portion 24 of the upper structure 23.

In these examples, the joints 24 of the lower structure 22 and the upper structure 23, which form the wall, are shaped to engage with each other, and the concavo-convex portion having the hinge structure is reinforced against shearing force. A plate such as shaped steel or steel plate is embedded.

That is, in FIG. 17A, the lower structure 22
The steel plate 31a is embedded on the side and the channel steel 32a is embedded on the side of the upper structure 23 to reinforce the joint portion 24. In FIG. 17 (b), T-shaped steel 32b is embedded in the lower structure 22 side upside down, and a recess is sandwiched in the upper structure 23 side.
The steel plate 31b is embedded to reinforce the joint 24 portion. In FIG. 17 (c), the T-shaped steel 32b is provided on the lower structure 22 side.
Are embedded upside down, and the grooved steel 32a is embedded in the upper structure 23 side so as to sandwich the concave portion to reinforce the joint portion 24 portion.

If necessary, an elastic material such as synthetic resin or synthetic rubber may be interposed between the vertically abutting portions without impairing the function as a hinge, or mortar or other grout material may be injected. To ensure that the axial force in the vertical direction can be transmitted.

FIG. 18 shows the lower structure 2 in the wall type structure.
2 shows another example of the structure of the joint portion 24 between the upper structure 23 and the upper structure 23. In this example, the lower structure 22 constituting the wall body is formed.
And a saw-toothed concavo-convex meshing with each other is formed in the joint portion 24 of the upper structure 22 to form a hinge structure. Also in this case,
If necessary, an elastic material may be interposed in the joint portion 24 or a grout material or the like may be injected.

A PC steel rod 26 is inserted between the lower structure 22 and the upper structure 23 to prevent the upper structure 23 from rising.

FIG. 19 shows an example of a joint portion 24 of a lower structure 22 and an upper structure 23 applied to a columnar body having a relatively small cross section. As shown in FIG. A steel pipe or ductile, or a cylindrical fitting protrusion 27 made of high-strength PC concrete or the like is projected on the upper end surface of the body 22 and embedded in the lower end of the upper structure 23 as shown in FIG. 19 (b). It is fitted in a hollow cylindrical fitting recess 28 made of ductile or the like, and an elastic material or a grout material 25 is interposed on the joint surface as required.

[0066]

According to the present invention, as a result of examining the insertion position of the hinge in the gate type structure, the deformation amount and the elastic energy absorption amount of the structure with respect to the same horizontal load and vertical load have a rigid joint at the joint. It was discovered that there is a position that is almost the same as the structure and is suitable for dividing precasting of the structure, and based on that finding, a hinge is provided at a predetermined height in the middle of the pillars or walls that make up the portal structure. Then, the structure is divided and precast.

As described above, since it is possible to divide the gate-shaped structure into precast parts, the workability of the gate-shaped structure can be improved.
Economical and quality reliability can be improved, and deterioration of load bearing capacity can be minimized.

In particular, when constructing a viaduct, a building, and other structures over existing roads and railways so as to straddle them, omission of turns and shortening of construction period can be achieved, and large-scale formwork support work can be omitted. However, it has a great advantage in that the work space can be minimized.

[Brief description of drawings]

1 to 6 are views for explaining the principle of a divided precast structure of a portal structure of the present invention, and FIG. 1 is two columns of a portal ramen structure with one layer and one span. It is a model figure when a hinge is inserted in the predetermined height of.

FIG. 2 is a diagram showing bending moment and deformation when the height of the hinge is changed in the model of FIG.

FIG. 3 is a relative height h ₁ of the hinge in the model of FIG.
6 is a graph showing the relationship between / h and the compliance ratio C / C ₀ .

FIG. 4 is a model diagram when a hinge is inserted at a predetermined height of each column of a portal-type rigid frame structure having a single-layer multi-diameter structure.

FIG. 5 is a diagram showing bending moment and deformation at the optimum height of the hinge in the model of FIG.

6 is a relative height h ₁ of the hinge in the model of FIG.
6 is a graph showing the relationship between / h and the compliance ratio C / C ₀ .

FIG. 7 is a perspective view of a completed system showing one embodiment of the present invention (corresponding to claims 1 to 5).

FIG. 8 is a perspective view showing a construction procedure in the embodiment of FIG.

FIG. 9 is a perspective view showing a construction procedure subsequent to FIG.

FIG. 10 is a perspective view showing a construction procedure subsequent to FIG.

FIG. 11 is a perspective view showing a construction procedure following FIG.

FIG. 12 shows an example of a specific form of the pier portion in the embodiment of FIG. 7, (a) is a perspective view with a part cut away, (b) is a detailed view of a skeleton, and (c) ) It is a cross-sectional view.

13 shows an example of the structure of the joint when the bridge pier of the form of FIG. 12 is applied, (a) is a longitudinal sectional view of the joint, (b) is a sectional view taken along line AA, c) is a sectional view taken along line BB,
(d) is CC sectional drawing.

FIG. 14 shows another example of the structure of the joint part,
(a) is a vertical cross-sectional view of the joint, (b) is a DD cross-sectional view of the same,
(c) is an EE sectional view and (d) is an FF sectional view.

FIG. 15 is another embodiment of the present invention (claims 1, 2;
FIG. 4 is a perspective view of a completed system showing (corresponding to 4 and 5).

16 (a) is a perspective view of a completed system showing a modification of the embodiment of FIG. 15, and FIG. 16 (b) is a completed system showing an embodiment when the same structure is applied to a structure having two spans. It is a perspective view of a diameter.

17 (a) to (c) are vertical cross-sectional views showing an example of a structure of a joint portion between a lower structure and an upper structure, respectively.

FIG. 18 is a vertical cross-sectional view showing another example of the structure of the joint portion between the lower structure and the upper structure.

FIG. 19 shows still another example of the structure of the joint portion between the lower structure and the upper structure, (a) is a perspective view of the upper portion of the lower structure, and (b) is a vertical sectional view of the joint portion. is there.

[Explanation of symbols]

1 ... Existing road (or railway), 2 ... Lower structure (bottom of pier), 3 ... Upper structure, 3a ... Upper pier, 3b ... Beam,
4 ... Joining part, 5 ... Precast transverse girder, 6 ... Floor slab, 11,
11 '... Axial steel frame, 12 ... Horizontal material, 13 ... Brace material, 14 ... Strip reinforcing bar material, 15 ... Concrete (joint part),
22 ... Lower structure (earth retaining wall), 22a ... Footing part, 23 ... Upper structure, 24 ... Joint part, 25 ... Elastic material or grout material, 26 ... PC steel rod, 27 ... Fitting convex part,
28 ... Fitting recesses, 31a, 31b ... Steel plates, 32a, 32
b ... Section steel

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Tamura             5-9-8 Gongkou, Nara City, Nara Prefecture (72) Inventor Hiroshi Sato             3-22-4 Aobadai, Izumi City, Osaka Prefecture (72) Inventor Saito Isao             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation F term (reference) 2D059 AA03 AA08 AA13 BB03 BB35                       BB37 BB39 CC03 GG02 GG55                       GG61                 2E125 AA03 AA52 AC01 AC02 AG03                       AG21

Claims (5)

[Claims] 1. A hinge joint portion is provided at an intermediate height of columns or walls that form a one-span or multi-span portal structure.
A divided precast structure in which the gate-shaped structure is divided into a lower structure and an upper structure at the hinge joint position, and at least one of the lower structure and the upper and lower structures is precast. A divided precast structure for a gate-shaped structure, characterized in that the position is provided in the vicinity of a position where the elastic energy absorbed by the gate-shaped structure against an assumed load is minimized. 2. The gate type according to claim 1, wherein the lower structure is made of cast-in-place concrete, a precast member is used for the upper structure, and the lower structure and the upper structure are connected via a hinge joint. Structure pre-cast structure. 3. A precast member including a plurality of lower structures that form a lower portion of a pillar on both sides of an existing structure, and including an upper portion of the pillar on the lower structure on each side of the existing structure. By constructing an upper structure consisting of, by connecting the lower structure and the upper structure via a hinge joint, after building a gate-type structure as a support structure on both sides of the existing structure, The divided precast structure for a portal structure according to claim 1 or 2, characterized in that a erected structure that extends above the existing structure is installed between the portal structures on both sides of the existing structure. A method of constructing a structure using. 4. A lower structure that constitutes a lower part of a pillar or a wall is constructed on both sides of an existing structure, and on the lower structure,
An upper structure made of a precast member including an upper part of the pillar or the wall is laid so as to traverse above the existing structure, and the lower structure and the upper structure are connected via a hinge joint. The method for constructing a structure using the divided precast structure of the portal structure according to claim 1 or 2. 5. The method for constructing a structure using a divided precast structure according to claim 3, wherein the existing structure is an existing road or railway.