JP4647544B2 - Underpass construction method and underpass - Google Patents

Description

  The present invention relates to an underpass construction method and an underpass.

  Conventionally, when constructing a road tunnel, the construction of a mountain retaining wall and road surface lining as a temporary structure, and excavation of the ground to construct the frame to a predetermined depth, or a starting base is installed. In addition, a shield method for excavating the ground by a shield method and constructing a frame to a predetermined depth has been used.

In the case of constructing an underpass road, there is a method in which a mountain retaining wall is provided to excavate the ground, and the mountain retaining wall is used as it is as a side wall of the underpass road (for example, see Patent Document 1 and Patent Document 2). ).

Japanese Patent Laying-Open No. 2005-290889 JP-A-2005-273302

  However, the open-cut method has many construction procedures and does not satisfy the process in the three-dimensional construction of a plane crossing road in an urban area that needs to be constructed in a short construction period. In addition to the increase in construction costs, the shield construction method involves the risk of remaining underground objects and underground obstacles.

  The present invention has been made in view of such a problem, and the object of the present invention is to reduce the construction process and reduce the construction cost, and to prevent underpass that can prevent deformation of the surrounding ground. It is to provide a construction method and an underpass.

  A first invention for achieving the above-described object includes a step (a) of providing an opposing wall body on the ground, a step (b) of installing a housing head at the upper end of the wall body, and the housing A step (c) of laying a girder on the head; a plate excavating the ground; and disposed at a predetermined interval below the beam; and disposed at a predetermined interval below the plate material. And a step (d) of installing a pressure plate between the walls, and in the step (d), after applying the cast-in-place prestressed concrete to the wall of the wall, An underpass construction method characterized in that cast-in-place reinforced concrete is constructed in the center.

  The wall provided in the step (a) is a precast prestressed concrete wall, a soil cement underground continuous wall formed by using the SMW method or the TRD method, a steel pipe sheet pile, a steel connection wall, a reinforced concrete connection wall, or the like. The housing head installed in the step (b) is composed of, for example, a main body and a chest wall, and a rubber support and a cushion material are provided on the upper surface of the main body and the inner side surface of the chest wall. The girders constructed in the step (c) are precast pretension girders, steel girders, reinforced concrete girders, and the like. The plate material installed in the step (d) is a perforated prestressed concrete panel or the like.

  In 1st invention, an intermediate | middle pile is installed between the opposing wall bodies by a process (a) as needed. In this case, in step (b), an intermediate pile head is installed at the upper end of the intermediate pile, and in step (c), a girder is erected between the frame head and the intermediate pile head, and in step (d), Fix the plate to the wall and intermediate pile.

In the step (c), it is desirable to place super-hard hard concrete between the chest wall and the girder. Also, in step (c), at an arbitrary position, a PC steel rod in the direction of the road axis of the existing girder and a PC steel rod in the direction of the road axis of the newly installed girder are connected using a joint structure, and the new girder is connected. Tighten with PC steel bar.

In the step (d), it is desirable that the pressure-resistant plate is formed by applying cast-in-place reinforced concrete in the center after the cast-in-place prestressed concrete is applied to the wall.

In the first invention, first, the opposing wall is provided on the ground, and the housing head is installed at the upper end of the wall. Next, a girder is erected on the frame head. Then, the ground is excavated, and a plate member disposed at a predetermined interval below the beam and a pressure plate disposed at a predetermined interval below the plate member are installed between the wall bodies.

  The second invention is an underpass constructed by the underpass construction method of the first invention.

  ADVANTAGE OF THE INVENTION According to this invention, the frame construction process can be shortened and the construction cost can be reduced, and an underpass construction method and underpass that can prevent deformation of the surrounding ground can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description, prestressed concrete is referred to as PC and reinforced concrete is referred to as RC.

FIG. 1 is a diagram illustrating a process of forming a precast PC frame 7 and a steel pipe support 9 on the ground 1. In the process shown in FIG. 1, first, three sets of self-supporting mountains 3 are placed on the ground 1, and the ground 1 between the self-supporting mountains 3 is excavated to form three spaces 5. And the precast PC housing 7 which is a wall body which opposes under the space 5 of the two places of both outer sides is laid. Moreover, the steel pipe support | pillar 9 which is an intermediate | middle pile is driven under the space 5 of one center.

  FIG. 2 is a diagram illustrating a process of performing head processing of the PC housing and the steel pipe support. In the step shown in FIG. 2, first, a PC housing head 11, which is a housing head, is installed at the upper end of the precast PC housing 7. Moreover, the steel pipe support | pillar head 13 which is an intermediate pile head is installed in the upper end part of the steel pipe support | pillar 9. As shown in FIG. Then, the space 5a is backfilled to remove the self-supporting mountain stay 3 and the space 5b is backfilled.

  FIG. 3 is a diagram showing a process of installing the precast PC girder 25, and FIG. 4 is a diagram showing the periphery of the PC housing head 11 and the steel pipe column head 13. 4A is an enlarged view of a portion shown in a range A of FIG. 3, and FIG. 4B is an enlarged view of a portion shown in a range B of FIG.

  In the process shown in FIG. 3, first, the portion of the ground 1 where the precast PC girder 25 is installed is excavated. And as shown in FIG. 4, the rubber bearing 15, the cushioning material 19, and the uncover 17 are installed in the PC housing | casing head 11 and the steel pipe support | pillar head 13. The rubber support 15 and the cushion material 19 are band-shaped members. The uncover 17 is a rod-shaped member having a head.

As shown in FIG. 4A, the PC housing head 11 includes a chest wall 11a and a main body 11b. In the PC housing head 11, a rubber support 15a is fixed to the lower half of the inner side surface 16a of the chest wall 11a, and a cushion material 19a is fixed to the upper half. Further, a rubber bearing 15b is fixed near the center of the upper surface 16b of the main body 11b, and a cushion material 19b is fixed to both sides of the rubber bearing 15. Furthermore, the uncover 17a is installed so that a lower end may penetrate the main body 11b through the rubber support 15b.

As shown in FIG. 4B, in the steel pipe column head 13, the cushion material 19c is fixed near the center of the upper surface, and the rubber bearings 15c are fixed on both sides of the cushion material 19c with a predetermined interval. . Moreover, the uncover 17b is installed so that the lower end may penetrate the steel pipe column head 13 through the rubber support 15c.

After the rubber bearing 15, the cushion material 19 and the uncover 17 are installed on the PC housing head 11 and the steel pipe column head 13, as shown in FIGS. Precast PC girder 25 is installed. The precast PC beam 25 is a pretension beam. Then, a plurality of precast PC girders 25 are laterally tightened using the PC steel bar 21. It is desirable to perform horizontal fastening of the precast PC girder 25 every work day.

FIG. 5 is a diagram showing a lateral fastening method for the precast PC girder 25. 5A is a cross-sectional view taken along the line C-C in FIG. 3, and FIG. 5B is an enlarged view of a portion indicated by a range D in FIG. 5A. Precast PC girders 25-n, precast PC girders 25- (n-1)... Shown in FIG. 5 are existing precast PC girders 25 that are laterally tightened at the end of the previous operation. In addition, the precast PC digit 25- (n + 1), the precast PC digit 25- (n + 2)... Are newly installed precast PC digits 25 that are laterally tightened at the end of the current work.

As shown in FIG. 5B, the PC steel bar 21 for laterally fastening the precast PC girder 25 is connected by a joint structure 30 including a sheath 31, a recess 33, a coupler 35, a nut 37, a bearing plate 39, and the like. Is done. The sheath 31 is arranged in the road axis direction of the precast PC girder 25. The recess 33 is disposed at the end of the sheath 31. The concave portion 33 includes a concave portion 33a provided on the front end surface of the precast PC girder 25 in the construction progress direction (direction indicated by arrow E in FIG. 5) and a concave portion 33b provided on the end surface on the rear side in the construction progress direction.

As shown in FIG. 5, the existing precast PC girders 25-n, precast PC girders 25- (n-1)... Are laterally tightened using PC steel bars 21-m at the end of the previous operation. The end of the PC steel bar 21-m on the front side in the construction progress direction is fixed to the recess 33a of the precast PC girder 25-n by using the bearing plate 39 and the nut 37.

In the process shown in FIG. 3, at the end of the work, the PC steel rod 21- (m + 1) is inserted through the sheath 31 of the plurality of precast PC girders 25- (n + 1), precast PC girders 25- (n + 2). Using the inside of the recess 33 as a work space, the coupler 35 connects the end of the PC steel rod 21-m on the front side in the construction progress direction and the end of the PC steel rod 21- (m + 1) on the rear side in the construction progress direction. Then, the end of the PC steel bar 21- (m + 1), which is not shown, on the front side in the construction progress direction is used in the same manner as the end of the PC steel bar 21-m, on the front side in the construction progress direction, using the bearing plate 39 and the nut 37. Then, it is fixed to the recess 33a of the precast PC girder 25.

In the process shown in FIG. 3, after a plurality of newly installed precast PC girders 25 are laterally tightened, as shown in FIGS. 4 (a) and 5 (a), the precast PC girders 25 and the PC housing head are shown. 11 is placed between the rubber support 15a and the cushion material 19a. Moreover, as shown in FIG. 4B and FIG. 5A, the interstitial concrete 23 is placed at the butt portion of the precast PC girder 25 on the steel pipe column head 13. Then, the peripheral temporary pavement 29 is rubbed.

FIG. 6 is a diagram illustrating a process of performing the above-ground pavement 41. In the process shown in FIG. 6, the ground 1 between the precast PC housings 7 is excavated to form a space 43. Further, a ground pavement 41 is applied to the upper surface of the precast PC girder 25. The above-ground pavement 41 is a main pavement. And the ground 1 around the lower end part of the precast PC housing 7 and the steel pipe support 9 is improved by an appropriate method such as chemical injection 44.

FIG. 7 is a diagram illustrating a process of installing the concrete panel 45 and the pressure plate 51. In the process shown in FIG. 7, first, the bracket 47 a is fixed to the surface of the precast PC housing 7 on the space 43 side. Further, the bracket 47 b is fixed around the steel pipe support 9. And the concrete panel 45 which is a board | plate material is fixed to the bracket 47a and the bracket 47b.

As the concrete panel 45, a perforated prestressed concrete panel or the like is used. The concrete panel 45 and the bracket 47 are installed at a predetermined part (for example, an intersection part) of a three-dimensional intersection. The concrete panels 45 are arranged below the precast PC girder 25 at a predetermined interval to form a double floor.

Next, the ground 1 below the space 43 is further excavated to form a space 49, and the base material 55 is installed on the lower surface of the space 49. Then, a cast-in-place PC 51a is placed along the space 49 side surface of the precast PC housing 7, and a cast-in-place RC 51b is placed between the cast-in-place PC 51a. Form. Thereafter, pavement 53 is applied to the upper surface of the pressure plate 51.

It is desirable to use expanded concrete for the cast-in-place PC 51a and the cast-in-place RC 51b. The pressure plate 51 is arranged below the concrete panel 45 with a predetermined interval.

As described above, according to the present embodiment, the retaining wall and the road surface lining, which are usually temporary structures, are configured by the precast PC housing 7 and the precast PC girder 25, and are used as the underpass permanent structure. Early road opening is possible. In addition, the construction period can be shortened, and construction costs such as temporary settlement costs and lining costs can be reduced. Further, by forming a high-performance retaining wall using the precast PC housing 7, it is possible to prevent the surrounding ground 1 from being deformed.

In this embodiment, the precast PC girder 25 is cut off against deformation of the precast PC housing 7 by providing the rubber support 15 between the chest wall 11a and the main body 11b of the PC housing head 11 and the precast PC girder 25. Can be supported as a beam. That is, the precast PC girder 25 can be provided with a function as a soil retaining support, and the displacement stress of the precast PC housing 7 due to excavation work can be supported by the axial force of the precast PC girder 25.

Further, by providing the joint structure 30 in the precast PC girder 25, it is possible to perform lateral fastening at an arbitrary position using the PC steel rod 21 in the road axis direction when the operation is interrupted. Further, by providing the concrete panel 45 with a predetermined interval below the precast PC girder 25 to form a double floor structure, it is easy to maintain and manage underground objects.

In the present embodiment, when the pressure-resistant plate 51 is formed, the cast-in-place PC 51a is constructed in advance of the portion along the pre-cast PC housing 7, and then the cast-in RC 51b is constructed in the remaining portion. Water leakage at the connection portion between the housing 7 and the pressure plate 51 can be minimized.

In this embodiment, the precast PC frame 7 is used as the wall for retaining the earth, and the precast PC girder 25 is used as the girder. It is good also as a medium continuous wall, a steel pipe sheet pile, a steel connection wall, a reinforced concrete connection wall, etc. The girder may be a steel girder, a reinforced concrete girder, or the like. However, the construction period can be greatly shortened by using precast as much as possible in the wall and girders and reducing the number of cast-in members.

The concrete panel 45 is not limited to a perforated prestressed concrete panel. In this embodiment, the pressure plate 51 is formed after the concrete panel 45 is installed. However, the concrete panel 45 may be installed after the pressure plate 51 is formed. Furthermore, the steel pipe support 9 may be installed as necessary.

  While the underpass construction method and the preferred embodiment of the underpass according to the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The figure which shows the process of forming the precast PC frame 7 and the steel pipe support | pillar 9 in the ground 1 The figure which shows the process of performing the head process of PC frame and a steel pipe support The figure which shows the process of installing the precast PC girder 25 The figure which shows the circumference of PC frame head 11 and steel pipe support head 13 The figure which shows the side fastening method of the precast PC girder 25 The figure which shows the process of performing ground part pavement 41 The figure which shows the process of installing the concrete panel 45 and the pressure-resistant plate 51

Explanation of symbols

1 ......... Ground 5, 5a, 5b, 43, 49 ......... Space 7 ......... Precast PC housing 9 ......... Steel column 11 ...... PC housing head 11a ......... Chest wall 11b ......... Main body 13 ……… Steel tube heads 15, 15a, 15b, 15c ……… Rubber bearings 17, 17a, 17b ……… Uncovers 19, 19a, 19b, 19c ……… Cushion materials 21, 21-m, 21- ( m + 1) ... PC steel bar 23 ......... Filled concrete 25, 25- (n-1), 25-n, 25- (n + 1), 25- (n + 2) ... Precast PC girder 27 ......... Super fast-hardened concrete 30 ……… Joint structure 45 ………… Concrete panel 51 ……… Pressure-resistant plate 51a ……… Place-in-place PC
51b ………… RC

Claims (7)

A step (a) of providing opposing walls on the ground;
A step (b) of installing a housing head at the upper end of the wall;
A step (c) of installing a girder on the housing head;
The ground is excavated, and a plate member disposed at a predetermined interval below the beam and a pressure plate disposed at a predetermined interval below the plate member are installed between the wall bodies. Step (d);
Comprising
In the step (d), the pressure-resistant plate is formed by applying cast-in-place reinforced concrete in the center after the cast-in-place prestressed concrete is applied to the wall of the wall.   2. The underpass construction method according to claim 1, wherein the body head includes a main body and a chest wall, and a rubber support and a cushion material are provided on an upper surface of the main body and an inner side surface of the chest wall.   The underpass construction method according to claim 1, wherein the plate material is a perforated prestressed concrete panel. In the step (a), an intermediate pile is installed between the opposing wall bodies,
In the step (b), an intermediate pile head is installed at the upper end of the intermediate pile,
In the step (c), a girder is installed between the frame head and the intermediate pile head,
The underpass construction method according to claim 1, wherein in the step (d), the plate member is fixed to the wall body and the intermediate pile.   2. The underpass construction method according to claim 1, wherein in the step (c), super-hard hard concrete is placed between the chest wall and the beam. 3.   In the step (c), a PC steel rod in the direction of the road axis of the existing girder and a PC steel rod in the direction of the road axis of the existing girder are connected using a joint structure, and the new girder is connected by the PC steel rod. The underpass construction method according to claim 1, wherein the underpass is tightened sideways.   The underpass constructed by the underpass construction method according to any one of claims 1 to 6.

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