JP2007092463A - Construction method of approach section of viaduct, structure based on construction method of approach section, and structural object having the structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of an approach section by which the approach section of a viaduct can be constructed without substantially regulating the traffic of an existing road, but only with short-time regulation during night time etc., if any, and to provide a structure based on the construction method of the approach section, and a structural object having the structure. <P>SOLUTION: The approach section 5 comprises a precedent construction part 9 of the first section which is constructed to be narrower than an intended width of the approach section 5, and a rapid construction part 11 of the second section which is constructed adjacent to a side face of the precedent construction part 9. The rapid construction part 11 is arranged so that the axial direction of a tube-like rectangular block 19 for the rapid part may be oriented in a vertical direction. The side face of the rectangular block 19 for the rapid part is placed in a manner of abutting on the side face of a tube-like rectangular block 13 for the precedent part on the precedent construction part 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a construction method for an approach portion of a viaduct, a structure based on a construction method for an approach portion, and a structure including the structure.

  In general, for example, when constructing a viaduct approach section at the center of a road with two lanes on one side and four lanes as shown in FIG. 19, as shown in FIG. 20, the width and work of the viaduct to be constructed In order to secure the width of the area (= work zone), the approach section was constructed using the closed road as a closed road with one lane on one side of the existing road. However, this method of blocking one lane on each side of the existing road has a problem that traffic congestion occurs because only one lane on each side can be used during the construction period.

Therefore, as a method of shortening the lane closure period as much as possible, for example, in Patent Document 1, a bottom slab having a width smaller than the viaduct width is installed in the central separation zone portion of the existing road of the round-trip four lanes in two lanes on one side, A method is disclosed in which side walls are arranged on both upper surfaces of the bottom plate, and a precast floor slab having a viaduct width is installed on the side wall. In this method, first, a bottom plate having a width smaller than that of the viaduct and having a width about the center separation zone is installed in the center separation zone portion of the existing road without blocking the lane. Next, the side walls are installed on the upper surfaces of both sides of the bottom slab without leaving the lane closed. Finally, one-lane one-lane round-trip two lanes are closed, and a precast floor slab having a viaduct width, which has been manufactured in advance at a factory or the like, is installed on the side wall using this widened work area.
JP 2004-285627 A

  However, the method described in Patent Document 1 has a problem in that it takes about 3 to 4 days for curing because a cement material or the like is used to connect the precast floor slab and the side wall. It was. Moreover, in order to construct asphalt and other pavements on the upper surface of the precast slab after curing, there is another problem that the pavement work takes several days. And in these curing periods and paving work periods, there is a problem that traffic congestion occurs when there is a lot of traffic during the daytime or the like in order to stop one round trip two lanes on one side all day.

  Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is not to restrict traffic on existing roads, but to restrict only for a short time, such as at night, even when it is restricted. The construction method of the approach part which can construct | assemble the approach part of a viaduct, the structure based on the construction method of an approach part, and a structure provided with the said structure are provided.

In order to achieve the above object, the present invention provides a method for constructing a viaduct approach part, wherein the approach part is divided into a first part in a road width direction and a second part adjacent thereto. The first part is constructed in advance, and the second part is constructed by a rapid construction method capable of being constructed more rapidly than the construction of the first part (first invention).
According to the construction method of the approach part by this invention, in order to construct a 2nd part rapidly after constructing a 1st part ahead, the 1st part constructed | assembled first is an existing road, for example There is no need to regulate traffic by using only places that do not affect traffic such as the median strip. And since the 2nd part constructed | assembled next is constructed | assembled rapidly in a short time, it only has to regulate traffic at the time with few traffic volumes, such as a weekend, nighttime, and traffic congestion does not arise. In addition, the approach part is completed simultaneously with the construction of the second part. Therefore, when the second portion is constructed, it is possible to immediately pass the vehicle through the viaduct.

In a second aspect based on the first aspect, the second portion is constructed by arranging a cylindrical rectangular block so that its axial direction is a vertical direction, and the side surface of the rectangular block is the first side. And a step of joining the square block and the first portion, and a step of installing a slab above the square block. .
According to the construction method of the second part of the present invention, the second part can be constructed only by installing the cylindrical rectangular block so as to be adjacent to the first part. Can be constructed in a short time. Therefore, it is only necessary to regulate traffic during times of low traffic such as Saturdays, Sundays, and nights, and traffic congestion does not occur.

According to a third aspect, in the second aspect, the slab installed above the square block of the second portion is made of precast concrete.
According to the construction method of the approach portion according to the present invention, by using the precast material, the work such as concrete placement and curing at the site is eliminated, so that the construction period can be shortened.

According to a fourth invention, in the second or third invention, the method further comprises a step of joining adjacent square blocks before or after the step of joining the square blocks and the first portion. To do.
According to the second part construction method of the present invention, before the step of joining the square block and the first part, a plurality of square blocks are installed at a time by jointing adjacent square blocks in advance. Therefore, the second part can be constructed in a short time. On the other hand, even after using the method of joining adjacent square blocks after the step of joining the square block and the first portion, the joining work can be made into a flow work, so work is not wasted. The second part can be constructed in a short time.

According to a fifth aspect of the present invention, in the first or second aspect of the invention, the first portion is constructed by arranging the square blocks so that the axial direction thereof is a vertical direction, and the sides of the square blocks are in contact with each other. The method includes a step of installing the rectangular blocks so as to contact each other, a step of bonding adjacent rectangular blocks, and a step of installing a slab above the rectangular blocks.
According to the first part construction method of the present invention, the square block is arranged so that the axial direction thereof is the vertical direction, and the square block is simply installed so that the side surfaces of the square block come into contact with each other. Since one part can be constructed, the first part can be constructed in a short time. Therefore, the construction period can be shortened.

According to a sixth invention, in any one of the second to fifth inventions, the square block, the first portion, and the adjacent square blocks are joined by screwing means such as a screw. Features.
According to the joining method of the present invention, it is possible to reliably join the square block and the first portion and adjacent square blocks in a short time by using a screwing means such as a screw.

According to a seventh invention, in any one of the second to sixth inventions, the square block is made of precast concrete.
According to the construction method of the approach portion according to the present invention, by using the precast material, the work such as concrete placement and curing at the site is eliminated, so that the construction period can be shortened.

The structure of the approach portion of the eighth invention is the structure of the approach portion of the viaduct, wherein the approach portion is divided into a first portion and a second portion adjacent to the first portion in the road width direction, The second part is constructed more rapidly than the construction of the first part.
According to the structure of the approach part according to the present invention, since the approach part is composed of the first part and the second part, the first part is constructed first, and then the second part is constructed. It becomes possible to do. Therefore, the first part to be constructed first does not need to regulate traffic by using a place that does not affect traffic such as only the median strip of the existing road. The second part to be constructed next can be constructed in a short time to construct only the second part, and it is only necessary to regulate the traffic at a time when the traffic volume is low, such as Saturdays, Sundays and nights. , No traffic jams. Further, by constructing the second portion, the approach portion can be easily widened to a desired width.

In a ninth aspect based on the eighth aspect, the second portion is disposed so that an axial direction of the cylindrical rectangular block is a vertical direction, and a side surface of the rectangular block is the first portion. The rectangular block and the first part are joined to each other, the adjacent square blocks are joined to each other, and a slab is installed above the square block. .
According to the structure of the 2nd part by this invention, it arrange | positions so that the axial direction of a square block may become a perpendicular direction, and a slab is installed so that the hollow part of a square block may be covered. Therefore, since this slab becomes a two-way slab supported by the side wall portion of the cylindrical square block, it is mechanically advantageous compared to a general one-way slab of a viaduct, reducing the slab thickness, Reduction, adoption of RC structure, etc. are possible, and the range of design is expanded.

According to a tenth aspect, in the eighth or ninth aspect, the first portion is disposed so that an axial direction of the rectangular block is a vertical direction, and side surfaces of the rectangular block are in contact with each other. The adjacent square blocks are joined to each other, and a slab is installed above the square blocks.
According to the structure of the 1st part by this invention, it arrange | positions so that the axial direction of a square block may become a perpendicular direction, and a slab is installed so that the hollow part of a square block may be covered. Therefore, since this slab becomes a two-way slab supported by the side wall portion of the cylindrical square block, it is mechanically advantageous compared to a general one-way slab of a viaduct, reducing the slab thickness, Reduction, adoption of RC structure, etc. are possible, and the range of design is expanded.

  The structure of the approach portion of the eleventh aspect of the present invention is the structure of the approach portion of the viaduct, wherein the approach portion is divided into a first portion in the road width direction and a second portion adjacent thereto. The second part is constructed more rapidly than the construction of the first part.

  In a twelfth aspect based on the eleventh aspect, the second portion is disposed such that the axial direction of the cylindrical rectangular block is a vertical direction, and the side surface of the rectangular block is the first portion. The rectangular block and the first part are joined to each other, the adjacent square blocks are joined to each other, and a slab is installed above the square block. .

  In a thirteenth aspect based on the eleventh or twelfth aspect, the first portion is disposed so that an axial direction of the rectangular block is a vertical direction, and side surfaces of the rectangular block are in contact with each other. The adjacent square blocks are joined to each other, and a slab is installed above the square blocks.

  By using the construction method of the approach part of the present invention, the structure based on the construction method of the approach part, and the structure provided with the structure, the traffic on the existing road is not significantly regulated, even when it is regulated at night, etc. It is possible to construct an approach section of a viaduct with only a short time regulation.

  Hereinafter, a preferred embodiment of a construction method for an approach portion according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a viaduct 1 according to the first embodiment of the present invention. As shown in FIG. 1, the viaduct 1 is a three-dimensional intersection formed so as to straddle the intersection of an existing road 3 a extending in the left-right direction in the drawing and another existing road 3 b extending in the front and back direction of the drawing.
The viaduct 1 is provided with a pair of approach portions 5 having a road surface 5a inclined from the road surface of the existing road 3a to a predetermined height, and a bridge portion 7 for connecting the road surfaces of the pair of approach portions 5 to each other.

FIG. 2 is a diagram illustrating the approach unit 5 according to the present embodiment.
As shown in FIG. 2, the approach part 5 is constructed adjacent to the first construction part 9 that is constructed narrower than the desired approach part 5 and the side surface of the construction part 9. The rapid construction part 11 of the second part is formed, and the preceding construction part 9 and the rapid construction part 11 form a width of the desired approach part 5.

  3 is an enlarged view of A in FIG. 2, FIG. 4 is a cross-sectional view along B-B ′ in FIG. 3, and FIG. 5 is a front view along C-C ′ in FIG.

  As shown in FIGS. 3 to 5, the preceding construction portion 9 is arranged so that the axial direction of the cylindrical leading portion rectangular block 13 is a vertical direction, and the side surfaces of the leading portion rectangular block 13 abut against each other. It is installed as follows. These adjacent leading-edge square blocks 13 are joined together by screwing means 15 such as screws. Moreover, the slab 17a is installed above the square block 13 for preceding parts so that the hollow part of the square block 13 for preceding parts may be covered, and the inclined road surface is formed. In the present embodiment, the square block 13 for the leading portion is, for example, a square block made of precast concrete having a length of 5000 mm, a width of 2500 mm, and a thickness of 200 mm. Since the upper end portion of the leading portion square block 13 has the same inclination angle as that of the approach portion 5, the height of the leading portion square block 13 varies depending on the installation position.

  The rapid construction section 11 is arranged so that the axial direction of the cylindrical rapid section square block 19 is a vertical direction, and the side surface of the rapid section square block 19 is a square block for the preceding section of the preceding construction section 9. It is installed so as to be in contact with the side surfaces of 13 and is joined by screwing means 21 such as screws. Moreover, it installs so that the side surfaces of the square block 19 for rapid parts of the rapid construction part 11 may contact | abut, and it is joined by the screwing means 15, such as a screw | thread. And the sloping road surface is formed by installing the slab 17b on the upper side of the square block 19 for rapid parts so that the hollow part of the square block 19 for rapid parts may be covered. In the present embodiment, the rapid part rectangular block 19 is, for example, a quadrangular columnar block made of precast concrete having a length of 5000 mm, a width of 1750 mm, and a thickness of 200 mm. It is installed so as to be in the lane direction of the approach portion 5. In addition, since the upper end part of the square block 19 for rapid parts has the same inclination angle as the approach part 5, the height of the square block 19 for rapid parts changes suitably with the position installed.

  In the present embodiment, the material, performance, and the like of the leading portion square block 13 and the rapid portion square block 19 are completely the same. Further, the unit weight, deformation coefficient, allowable compressive stress degree, etc. of the leading portion rectangular block 13 and the rapid portion rectangular block 19 are appropriately determined according to the field conditions.

FIG. 6 is a view showing the screwing means 15 according to the present embodiment.
As shown in FIG. 6, the leading square blocks 13 and the rapid square blocks 19 are connected to each other by bolts 15 a and nuts 15 b that are screwing means 15. Through holes 15c are provided in the side surfaces of the leading block square block 13 and the rapid block square block 19, respectively. Bolts 15a are inserted into the through holes 15c from the respective square blocks 13 and 19, and screwed with nuts 15b. By joining, they are joined.

FIG. 7 is a view showing the screwing means 21 according to the present embodiment.
As shown in FIG. 7, the leading square block 13 and the rapid square block 19 are joined by a bolt 21 a which is a screwing means 21. A screw hole 21b is provided on the side surface of the preceding-portion square block 13, and the bolt 21a is screwed into the screw hole 21b from the inside of the rapid-portion square block 19.

Next, the construction method of the approach part 5 is demonstrated according to a construction procedure.
8-18 is a figure which shows the construction method of the approach part 5 which concerns on this embodiment.

As shown in FIG. 8, in the present embodiment, for convenience of explanation, for example, a method of constructing the approach portion 5 in the central portion of the existing road 3 having two lanes on one side and four lanes on both sides will be described. . In the present embodiment, the existing road 3 having two lanes on one side and four lanes on both sides will be described. However, the present invention is not limited to this, and any road having a plurality of lanes on one side may be used.

First, as shown in FIG. 9, a net fence 25 is installed so as to be about the width of the median strip 23 of the existing road 3, and the inside of the net fence 25 is set in the daytime work zone so that all lanes can be passed. And In the daytime work zone, the preceding construction section 9 is constructed in the daytime.
The preceding construction section 9 first places a retaining wall 27a, and cuts down the pavement by a distance corresponding to the length of the approach section 5 in the lane direction inside the retaining wall 27a. And the foundation concrete 29a is laid so that it may become about the width | variety of the prior construction part 9, and the flat yard of a position a little lower than the road surface of the existing road 3 is formed.

Then, as shown in FIG. 10, in the section in which the foundation concrete 29 a is placed, the net fence 25 is expanded and installed on the existing road 3 with a width of about the approach portion 5, and one side lane on the center side of the existing road 3. The inside of this net fence 25 is made into a night work zone | Within this night work zone, the foundation of the rapid construction section 11 is constructed when the night traffic is low. In this embodiment, the foundation part of the rapid construction part 11 is constructed at night, and the preceding construction part 9 is constructed at daytime.
In constructing the foundation portion of the rapid construction portion 11, first, the earth retaining wall 27 b is driven by a distance corresponding to the length of the approach portion 5 in the lane direction so that the width is slightly wider than the width of the approach portion 5.

  Next, as shown in FIG. 11, the retaining wall 27a is pulled out, and the pavement is cut down by a distance corresponding to the length of the approach portion 5 in the lane direction inside the retaining wall 27b. Further, the road surface is covered with the lining plate 31 above the cut-down portion, and the existing road 3 is restored so that the vehicle can pass through the upper portion of the lining plate 31 in the daytime.

  Then, as shown in FIG. 12, the foundation concrete 29 b is placed on both sides of the foundation concrete 29 a and joined to the foundation concrete 29 a to produce the foundation 29 that is the width of the approach portion 5. After the foundation concrete 29b is placed, as shown in FIG. 13, the road surface is covered again with the lining plate 31, and the upper portion of the lining plate 31 is in a state where a vehicle can pass during the daytime.

  Note that the above-described work of placing the retaining wall 27b, the work of cutting down the pavement, and the work of placing the foundation concrete 29b and joining the foundation concrete 29a are performed in the night work zone when the night traffic is low. If each work does not finish the distance corresponding to the lane length of the approach section 5 overnight, the work is temporarily suspended in the morning and the net fence 25 is changed to the width of the daytime work zone. The lane is allowed to pass through, and the work is resumed by changing to the width of the night work zone again at night.

  As shown in FIGS. 14 and 15, the leading-edge square blocks 13 are arranged so that the axial direction thereof is a vertical direction during the daytime, and the side surfaces of the leading-edge square blocks 13 are in contact with each other on the foundation 29. Installed in the direction of the lane of the approach part 5 in order. The upper surface of the installed square block 13 for the leading portion has a shape inclined so as to become higher toward the intersection. Further, the preceding square blocks 13 are joined together by bolts 15a and nuts 15b, and a slab 17a made of precast concrete is joined to the upper surface of the preceding square block 13 by bolts or the like to form a roadbed. In addition, in this embodiment, although the slab 17a which consists of precast concrete was demonstrated, slab 17a is not limited to this, For example, you may use RC. Furthermore, the hollow part may be filled with expanded polystyrene and the upper surface may be paved.

  As described above, the foundation concrete 29a of the preceding construction part 9 is placed in the daytime, the preceding part square block 13 is installed at the position where the foundation concrete 29a has already been placed, and the rapid construction part 11 at night. By repeating the work of placing the foundation concrete 29b, the preceding construction part 9 and the foundation part of the rapid construction part 11 are constructed.

  Further, the constructed prior construction section 9 can be used as a work road for constructing the bridge section 7. And it becomes possible to shorten the whole process of viaduct 1 by utilizing this constructed preceding construction part 9.

  Then, as shown in FIGS. 16 and 17, after the construction of the preceding part square block 13 of the preceding construction part 9 and the basic concrete 29 b of the rapid construction part 11, the net fence 25 is expanded to work the work area at night. Remove the road surface lining above the foundation concrete 29b. Next, the rapid portion square blocks 19 are arranged so that the axial direction thereof is the vertical direction, and the side surface of the rapid portion square block 19 comes into contact with the side surface of the preceding portion square block 13 and the rapid portion square block 19 is arranged. It installs on the foundation 29 so that the side surfaces of the block 19 contact | abut, and it constructs toward the lane direction of the approach part 5 one by one. The upper surface of the installed rapid part square block 19 has a shape that is inclined so as to become higher toward the intersection as in the preceding construction part 9. Further, the rapid part square blocks 19 are joined to each other by bolts 15a and nuts 15b, and the rapid part square block 19 and the preceding part square block 13 are joined to each other by a push-in bolt 21a. Furthermore, a slab 17b made of precast concrete is joined to the upper surface of the rapid part square block 19 with a bolt or the like, and is joined to the existing slab 17a with a bolt or the like. Since the balustrade 35 is formed integrally with the slab 17b in advance, the labor for constructing the balustrade 35 can be omitted, and the rapid construction portion 11 can be rapidly constructed. Then, asphalt 37 and the like are paved on the upper surface of the roadbed to form the road surface 5a of the approach portion 5.

  In this embodiment, for example, when the length of the approach portion 5 on one side is 50 m and the rapid construction portion 11 is installed on the approach portions 5 (= 100 m) on both sides, after the rapid portion square block 19 starts to be installed. Work until the road surface of the approach section 5 is formed can be performed within 56 hours from low night traffic hours and Saturday and Sunday daytime nights, for example, from 10:00 Friday night to 6:00 Monday morning. It is.

  In the present embodiment, the method of joining the rapid part square blocks 19 to each other after the rapid part square blocks 19 are installed on the foundation 29 has been described. A method may be used in which a plurality of the rapid part square blocks 19 are joined and the plurality of rapid part square blocks 19 are simultaneously installed on the foundation 29 in this joined state.

  As shown in FIG. 18, immediately after the construction of the rapid construction section 11 is completed, the approach section 5 and the bridge section 7 are immediately connected, and the road surface is partitioned so as to be a double lane with one lane on one side, so that the vehicle can pass. It becomes a state.

  Therefore, according to the construction method of the approach part 5 of the present embodiment, after the preceding construction part 9 is constructed in advance, in order to construct the rapid construction part 11 rapidly, the preceding construction part 9 constructed first is For example, it is not necessary to regulate traffic by using only places such as the median strip 23 that do not affect traffic. Moreover, according to the construction method of the rapid construction part 11 by this invention, since the rapid construction part 11 can be constructed only by installing a cylindrical square block so that it may adjoin the preceding construction part 9, rapid construction is possible. The part 11 can be constructed in a short time. Therefore, it is only necessary to regulate the traffic at a time when the traffic volume is low, such as Saturdays, Sundays, and nights, and no traffic jam occurs. And the approach part 5 is completed simultaneously with constructing the rapid construction part 11. Therefore, when the rapid construction section 11 is constructed, it is possible to immediately pass the vehicle through the viaduct 1.

  Moreover, according to the construction method of the rapid construction part 11 according to the present invention, after joining the rapid part square block 19 and the preceding construction part 9, by joining the adjacent rapid part square blocks 19 to each other, Since the joining work of the rapid part square block 19 can be a flow work, the work is not wasted and the rapid construction part 11 can be constructed in a short time. On the other hand, before the step of joining the rapid part square block 19 and the preceding construction part 9, if a method of joining adjacent rapid use square blocks 19 together is used, a plurality of rapid use square blocks 19 are installed at a time. Therefore, the rapid construction part 11 can be constructed in a short time.

  And according to the construction method of the preceding construction part 9 by this invention, a square block is arrange | positioned so that the axial direction may become a perpendicular direction, and only a square block is installed so that the side surfaces of a square block may contact | abut. Therefore, the preceding construction section 9 can be constructed in a short time. Therefore, the construction period can be shortened.

  Furthermore, according to the joining method of the square block by this invention, by using the screwing means 15 such as a screw, the square block and the preceding construction portion 9 and the adjacent square blocks are joined reliably in a short time. It becomes possible.

  Moreover, according to the construction method of the approach part 5 according to the present invention, the use of the square blocks 13 and 19 made of precast concrete eliminates the work of concrete placement and curing at the site, thereby shortening the construction period. It becomes possible.

  Furthermore, according to the construction method of the approach part 5 according to the present invention, the use of the slab 17 made of precast concrete eliminates the work of concrete placement, curing, etc. on the site, so the construction period can be shortened. It becomes.

  And according to the structure of the rapid construction part 11 and the preceding construction part 9 by this invention, it arrange | positions so that the axial direction of a square block may become a perpendicular direction, and the slab 17 is installed so that the hollow part of a square block may be covered. The Therefore, since this slab 17 becomes the two-way slab 17 supported by the side wall portion of the cylindrical square block, it is mechanically advantageous compared to a general viaduct one-way slab, and the slab thickness is reduced. It is possible to reduce the number of reinforcing bars and adopt an RC structure, thereby expanding the range of design.

  In the present embodiment, the construction method of the approach part 5 for the viaduct of the vehicle has been described. However, the present invention is not limited to this, and can also be applied to the approach part of the viaduct for sidewalks and railways.

  In addition, in this embodiment, although the method of arrange | positioning only one row of square blocks in the rapid construction part 11 was demonstrated, it is not limited to this, You may arrange | position several square blocks.

It is a side view of the viaduct concerning a first embodiment of the present invention. It is a figure which shows the approach part which concerns on this embodiment. It is an enlarged view of A of FIG. FIG. 4 is a B-B ′ sectional view of FIG. 3. FIG. 4 is a front view of C-C ′ in FIG. 3. It is a figure which shows the screwing means which concerns on this embodiment. It is a figure which shows the screwing means which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is a figure which shows the construction method of the approach part which concerns on this embodiment. It is sectional drawing which shows the construction method of the conventional approach part. It is sectional drawing which shows the construction method of the conventional approach part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Viaduct 3 Existing road 5 Approach part 5a Road surface 7 Bridge part 9 Prior construction part 11 Rapid construction part 13 Prior part square block 15 Screwing means 15a Bolt 15b Nut 15c Through-hole 17 Slab 19 Rapid part square block 21 Screwing means 21a Bolt 21b Screw hole 23 Median strip 25 Net fence 27 Earth retaining wall 29 Foundation 29a Foundation concrete 29b constructed in the preceding construction section Foundation concrete 31 constructed in the rapid construction section Covering plate 35 Handrail 37 Asphalt

Claims (13)

A method for constructing an approach part of a viaduct,
The approach part is divided into a first part in the road width direction and a second part adjacent to the first part, and the first part is constructed in advance,
The construction method of the approach part characterized by constructing the said 2nd part with the rapid construction method in which construction can be carried out more rapidly than construction of the said 1st part. The construction of the second part is
Arranging the cylindrical square block so that the axial direction thereof is a vertical direction, and placing the side surface of the square block in contact with the side surface of the first portion;
Joining the square block and the first portion;
The construction method of the approach part of Claim 1 provided with the process of installing a slab above the said square block.   The construction method of the approach part according to claim 2, wherein the slab installed above the square block in the second part is made of precast concrete.   The construction method of the approach part of Claim 2 or 3 further equipped with the process of joining the said adjacent square blocks before or after the process of joining the said square block and the said 1st part. . The construction of the first part is
Disposing the square block so that its axial direction is a vertical direction, and installing the square block so that the side surfaces of the square block are in contact with each other;
Joining the adjacent square blocks;
The construction method of the approach part of Claim 1 or 2 provided with the process of installing a slab above the said square block.   The approach portion according to any one of claims 2 to 5, wherein the square block, the first portion, and the adjacent square blocks are joined together by screwing means such as a screw. Construction method.   The said square block consists of precast concrete, The construction method of the approach part in any one of Claims 2-6 characterized by the above-mentioned. In the structure of the approach part of the viaduct,
The approach portion is divided into a first portion and a second portion adjacent to the first portion in the road width direction,
The structure of the approach part, wherein the second part is constructed more rapidly than the construction of the first part. The second part is
The cylindrical rectangular block is disposed so that the axial direction thereof is the vertical direction, and the side surface of the rectangular block is installed so as to contact the side surface of the first part,
The square block and the first portion are joined,
Adjacent square blocks are joined together,
The structure of the approach part according to claim 8, wherein a slab is installed above the square block. The first part is
It is disposed so that the axial direction of the rectangular block is a vertical direction, and is installed so that the side surfaces of the rectangular block are in contact with each other,
Adjacent square blocks are joined together,
The structure of the approach part according to claim 8 or 9, wherein a slab is installed above the square block. In the structure of the approach part of the viaduct,
The approach portion is divided into a first portion and a second portion adjacent to the first portion in the road width direction,
The structure of the approach part, wherein the second part is constructed more rapidly than the construction of the first part. The second part is
The cylindrical rectangular block is disposed so that the axial direction thereof is the vertical direction, and the side surface of the rectangular block is installed so as to contact the side surface of the first part,
The square block and the first portion are joined,
Adjacent square blocks are joined together,
The structure of the approach portion according to claim 11, wherein a slab is installed above the square block. The first part is
It is disposed so that the axial direction of the rectangular block is a vertical direction, and is installed so that the side surfaces of the rectangular block are in contact with each other,
Adjacent square blocks are joined together,
The structure of the approach part according to claim 11 or 12, wherein a slab is installed above the square block.

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