JP2008095332A - Levee widening/raising construction method for existing concrete wall for retaining earth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a levee widening/raising construction method for achieving excellent transportation property and construction property and creating satisfactory environment by use of a steel framework member and materials obtained at site such as stones, gravel, sediment, etc. without performing the work for placing concrete requiring chipping and use of a form. <P>SOLUTION: Anchor bolts 2 are driven into a side face 1a and an upper face 1b of the concrete wall 1 for retaining earth, respectively. Next, steel box-shaped forms 3 for levee widening are put in parallel on the side face 1a of the concrete wall and are fixed on the anchor bolts 2, and then their inside parts are filled with a stuffing material 7. The procedures of the work are repeated to perform levee widening of the whole side face 1a of the concrete wall. Next, steel box-shaped forms 4 for raising are put in parallel on the upper face 1b of the concrete wall positioned on an upper face of a levee widening part and behind it and are fixed on the anchor bolts, and then their inside parts are filled with the stuffing material 7, thereby performing raising of the upper face 1b of the concrete wall. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a novel construction method for applying a bellow and raising a wall for various earth retaining walls (hereinafter referred to as a concrete earth retaining wall) such as an old concrete weir, retaining wall, and embankment.

  Some existing concrete retaining walls of this type are obsolete and exceed their limits of use. In recent years, there has been an increasing number of cases where life-prolonging treatment is carried out by reinforcing work for such an old concrete earth retaining wall body without performing a new replacement work.

  Conventionally, reinforcement work of new concrete is generally used as reinforcement work. In this process, new concrete is applied to the existing concrete earth retaining wall through the steps shown in FIGS.

  That is, first, as shown in FIG. 10 (a), the surface of the existing concrete earth retaining wall 1 is chipped with a chipper or the like to form an uneven surface 8 on which new concrete is likely to adhere. Next, as shown in FIG. 4B, a large number of anchors 9 are driven on the surface of the chipped concrete earth retaining wall 1, and then a mold 10 is installed as shown in FIG. To do. Then, as shown in FIG. 4D, new concrete 11 is placed in the mold 10 and cured, and then the mold 10 is removed as shown in FIG. As a result, the vertical cross section of the existing concrete earth retaining wall 1 is affixed by a certain amount w and the height is increased by a certain amount t '.

  However, such a conventional reinforcing work requires special work such as chipping and attachment / detachment of the formwork, so that these specialized workers must be secured. In addition, since the new bellows and raised parts are made of concrete that is easily affected by temperature and weather conditions, careful quality control of the new concrete to be placed is required. Furthermore, there are many constructions in steep places such as mountainous areas, which makes it difficult to carry in heavy components such as large heavy machinery and formwork. There are various problems.

  The present invention has been made to solve such problems, does not require any special special work or special quality control, and can always obtain a certain high quality, and can be used in mountainous areas. It is an object of the present invention to provide a bellows / lifting method for an existing concrete retaining wall that is excellent in transportability and workability of members to a steep installation location.

  In the construction method of the present invention that achieves the above-mentioned object, anchor bolts are driven at predetermined intervals on the side surface of the concrete wall to be affixed to the existing concrete earth retaining wall and the upper surface of the concrete wall to be raised. Steps and prefabricated steel framework members are combined to form the required number of abdomen box frames, and each box frame is first placed at the bottom along the side of the concrete wall to be ablated. Installed in parallel, and then, above each box formwork, the necessary number of bellows box forms formed in the same manner as described above are installed in parallel step by step and stacked up to the top stage. In addition, each of the abdomen box molds installed in parallel is fixed to the anchor bolt to be integrated with the existing side wall of the concrete wall, and each abdomen box mold is provided with a screen material for preventing the outflow of filling material. In addition, the bellowing step of repeatedly filling the filling material, and in the bellowing step, the upper surface of each bellowing box form installed in parallel at the uppermost stage, and the soil located behind it The required number of raised box frames formed by combining prefabricated steel framework members are arranged in parallel on the upper surface of the concrete wall of the fastening wall, and the raised box frames located in front of each other are connected to each other. In addition, each raising box frame arranged in parallel on the upper surface of the concrete wall is fixed to an anchor bolt to be integrated with the upper surface of the concrete wall. The gist and the raising method of the existing concrete earth retaining wall body which consists of the raising process which attaches and fills the filling material and makes it a summary.

  In the construction method of the present invention, the bellows and raising box frame formed by combining the prefabricated steel framework members preferably have a framework of a ramen structure or a truss structure.

  In addition, the screen material for preventing the outflow of the filling material attached to the box form for abdomen and the box form for raising is a steel material such as shape steel, grating, welded wire mesh, expanded metal, or thinned wood depending on conditions. As the filling material to be filled in these box molds, locally generated materials such as stone, reki and earth and sand can be used.

  Furthermore, in the construction method of the present invention, the wall side surface of the existing concrete wall for earth retaining is to refer to either the downstream side or the upstream side of the concrete wall, the downstream side, Sometimes refers to the side of both concrete walls located upstream. Further, in the method of the present invention, it is not always necessary to carry out both the bellowing step and the raising step, and only the bellowing step may be carried out while omitting the raising step. In addition, the bellows to the lowermost step part of the concrete wall side to be attached can be omitted depending on the situation, for example, when the lowermost step part is buried.

  According to the construction method of the present invention having the above-described structure, the bellows and raising of the existing earth retaining concrete wall such as a dam can be filled with steel framing members and locally generated materials such as stone, reki, earth and sand. Therefore, unlike the conventional method of forming with concrete, there is no need to perform special specialized work such as chipping or attaching / detaching the concrete formwork, and its quality is not affected by temperature or climatic conditions. .

  In addition, the steel framework members that form the belly box frame and the raised box frame are all prefabricated assembly parts, so they are lightweight and can be applied to mountainous or steeply sloped areas due to human power. It can be transported and constructed, and does not require heavy machinery for transportation and construction.

  In addition, the bellows box frame and the raised box frame formed of steel framework members are all integrated with the existing concrete wall to be bellowed and raised, so that water pressure, earth pressure, etc. Resistance to external force is expected only from the weight of the filling material. Therefore, the stability of the structure is not affected by the quality of the filling material, etc., and locally generated materials such as stones, rakes, and earth and sand can be used as the filling material, thereby reducing the residual soil treatment. be able to.

  Hereinafter, an embodiment of the method of the present invention will be described with reference to the drawings.

  FIG. 1 is an implementation process diagram of the method of the present invention. FIG. 1 (a) shows an anchor bolt placing process, FIGS. 1 (b) to (e) show an abdomen mounting process, and FIG. The process is shown. Reference numeral 1 denotes a concrete dam, which is an existing concrete earth retaining wall, 1a is a side surface of the concrete wall to be attached to 1, 1b is an upper surface of the concrete wall to be raised by 1, 2 is an anchor bolt, 3 Is a box frame for bellows, and 4 is a box frame for raising.

  That is, in the construction method of the present invention, as shown in FIG. 1 (a), the concrete wall side surface 1a (illustrated example) to be laid on the concrete dam 1 to be laid and raised is applied. 1 shows a case where the stomach is attached only to the concrete wall side surface 1a on the downstream side of 1), and anchor bolts 2 are placed on the concrete wall upper surface 1b to be raised. These anchor bolts 2 are for fixing a bellows box frame 3 and a raising box frame 4 to be described later, and the installation positions of the bellows box frames 3 on the concrete wall side surface 1a, In addition, the necessary number is embedded in advance at predetermined intervals in the installation positions of the raised box frames 4 on the concrete wall upper surface 1b.

  Next, a required number of bellows box frames 3 are assembled. As shown in FIG. 1 (b), these bellow box boxes 3 are first installed in parallel at the lowermost stage along the concrete wall side surface 1 a on the downstream side where the concrete dam 1 is to be bellowed. Is. As shown in FIG. 2, each bellow box 3 is composed of a prefabricated rectangular steel frame member 3 ′ and a columnar steel frame member 3 ″. By joining them, they are formed into a box frame that forms a rigid frame structure with strong deformation resistance, and each of the formed box frames 3 for abdomen is placed in parallel at the bottom of the side wall 1a of the concrete wall. The surface portion is fixed to the anchor bolt 2 and integrated with the concrete wall side surface 1a.

  Next, as shown in FIG. 3, the front F of each bellows box form 3 integrated with the concrete wall side face 1a as described above, and the end side face S of the bellows box form located at the left and right ends, as shown in FIG. The screen material 5 is attached with bolts 6 respectively. These screen materials 5 prevent the filling material 7 filled in the bellows box form frames 3 from flowing out. In the illustrated example, a plurality of L-shaped steels are arranged at equal intervals to form a lattice shape. It is attached to. In addition, as the screen material 5, other steel materials such as H-shaped steel, grating, welded wire mesh, expanded metal, or wood such as thinned wood can be processed and used. When the attachment of the screen material 5 is completed, as shown in FIG. 1 (c), the filling material 7 such as stone, rake, earth and sand, etc., which are locally generated materials, is filled into each bellows box form 3. .

  In this way, when the abdomen work to the lowermost stage of the concrete wall side surface 1a is completed, the same work is repeated as shown in FIG. 1 (d), and the abdomen work of the upper stage or one upper stage is repeated. To do. Then, as shown in FIG. 1 (e), when the height t of the bellows portions stacked in stages from the bottom is substantially aligned with the height of the concrete wall side surface 1a, the topmost bellows work. Is completed.

  When the urging operation to the concrete wall side surface 1a of the concrete dam 1 is completed, the concrete dam 1 is then raised. As shown in FIG. 1 (f), the raising work is performed in the above-mentioned bellows work, the upper surface of each bellows box form 3 installed in parallel at the uppermost stage, and the concrete dam located behind it. This is done by placing a necessary number of raising box frames 4 in parallel on one concrete wall upper surface 1b.

  That is, as shown in FIG. 4, the raising box frame 4 includes a prefabricated rectangular steel frame member 4 ′ and a columnar steel frame member 4 ″, which are the same as the bellows box frame. These are combined in the field and rigidly joined to form a raised box frame having a required height to form a rigid frame structure having strong deformation resistance. Are installed in parallel on the upper surface of the uppermost bellows box form 3 and the concrete wall upper surface 1b located behind it, and the ones located before and after each other are connected with bolts or the like, and the concrete wall The raising box form 4 installed in parallel to the upper surface 1b is fixed to the anchor bolt 2 and integrated with the concrete wall upper surface 1b.

  Then, as shown in FIG. 5, on the front side F, the back side B, and the end side surface S of the raising box frame located at both left and right ends of each raising box frame 4 integrated with the concrete wall upper surface 1b. In addition, after attaching the same screen material 5 as described above, the inside of each raising box form 4 is filled with a filling material 7 such as stone, rake, earth and sand, etc., which are locally generated materials. Finally, the screen material 5 is attached to the upper surface U of each raising box form 4 filled with the filling material 7. Thereby, the raising work is completed.

  FIG. 6 shows another embodiment of the construction method of the present invention, in which a truss structure in which prefabricated steel frame members forming the bellows box frame 3 and the raising box frame 4 are configured in units of triangles. This is an example.

  FIG. 7 shows another embodiment of the construction method according to the present invention. The side wall of the concrete wall to be applied to the existing concrete earth retaining wall 1 such as a dam is the earth retaining wall 1. In this case, both the concrete wall side surface 1a located on the downstream side of the concrete wall and the concrete wall side surface 1c located on the upstream side are shown.

  Moreover, FIG. 8 is a case where only the bellowing process is carried out by the method of the present invention on the existing concrete earth retaining wall 1 such as a dam, and FIG. FIG. 4B shows an example in which the concrete wall side surface to be carried out is only the concrete wall side surface 1a located on the downstream side of the earth retaining wall body 1. FIG. The case where it is both the concrete wall side surface 1a located in the downstream of the fastening wall body 1 and the concrete wall side surface 1c located in the upstream is shown.

  Further, FIG. 9 shows that when the lower end of an existing concrete earth retaining wall 1 such as a dam is buried in the ground, the earth retaining wall 1 is to be attached to the stomach. This is an example in which the anchoring operation is omitted without placing anchor bolts and parallel mounting of the bellows box form frame on the lowermost step portion of the concrete wall side surface. (A) shows the case where the concrete wall side surface to be bellowed is the concrete wall side surface on the downstream side of the earth retaining wall, and FIG. The case where it is both the downstream and upstream side of the wall for earth retaining is shown.

It is sectional drawing explaining the implementation process of this invention construction method in steps. It is a perspective view explaining the assembly structure of the box form frame for stomach attachment concerning this invention. It is a figure explaining the screen material attached to a box-form frame for bellows, (a) is a front view, (b) is a side view. It is a perspective view explaining the assembly structure of the box form for raising concerning the present invention. It is a figure explaining the screen material attached to the box form for raising, (a) is a front view, (b) is a side view. It is a figure explaining the other Example of this invention construction method, (a) is a front view, (b) is a side view. It is sectional drawing explaining the other Example of this invention construction method, and is the case where the concrete wall side to be affixed is both a downstream side and an upstream side. It is sectional drawing which shows the other Example of this invention construction method, (a) When the concrete wall side surface which is going to lie down is only the downstream side, (b) is the concrete wall side surface which is going to lie down, the downstream side and the upstream side In both cases. It is sectional drawing which shows the other Example of this invention construction method, (a) When the concrete wall side surface which is going to lie down is only the downstream side, (b) is the concrete wall side surface which is going to lie down, the downstream side and upstream This is the case for both sides. It is sectional drawing explaining the conventional stomaching and raising method in steps.

Explanation of symbols

1 Concrete retaining wall (concrete dam)
1a 1 downstream concrete wall side 1b 1 concrete wall upper surface 1c 1 upstream concrete wall side 2 anchor bolt 3 bellows box form 3 'rectangular steel assembly member 3 "columnar steel assembly member 4 for raising Box form 4 'Rectangular steel assembly member 4 "Column steel assembly member 5 Screen material 6 Bolt 7 Filling material

Claims (7)

Placing anchor bolts at predetermined intervals on the side of the concrete wall to be laid on an existing concrete earth retaining wall and the upper surface of the concrete wall to be raised;
Prefabricated steel frame members are combined to form the required number of abdomen box frames, and each box frame is first installed in parallel at the bottom of the concrete wall side to be ablated. Thereafter, the necessary number of bellows box forms formed in the same manner as described above are placed in parallel step by step and stacked up to the top stage above each box form. Each installed box form for abdomen is fixed to the anchor bolt and integrated with the existing concrete wall side surface, and a screen material for preventing the outflow of filling material is attached to each abdomen box form, An abdomen process for repeatedly filling the filling material;
In the bellows step, prefabricated steel framework members are respectively provided on the upper surface of each bellow box box frame installed in parallel at the uppermost stage and on the concrete wall upper surface of the earth retaining wall located behind the upper frame. The necessary number of raising box forms formed in combination are arranged in parallel, and the raising box forms located in front of and behind are connected to each other, and each raising box form arranged in parallel on the upper surface of the concrete wall is An anchoring step for fixing the anchor bolt and integrating it with the concrete wall upper surface, and attaching a screen material for preventing the outflow of the filling material to each of these raising box molds, and filling the filling material,
The bellows and raising method for existing concrete earth retaining walls. A process of placing anchor bolts at a predetermined interval on the side of the concrete wall to be abdomen of an existing concrete retaining wall,
Prefabricated steel framework members are combined to form the required number of abdomen box frames, and each box frame is first installed in parallel at the bottom of the concrete wall side to be ablated. Thereafter, the necessary number of bellows box forms formed in the same manner as described above are placed in parallel step by step and stacked up to the top stage above each box form. Each installed box form for abdomen is fixed to the anchor bolt to be integrated with the side surface of the existing concrete wall, and a screen material for preventing leakage of filling material is attached to each abdomen box form, An abdomen process for repeatedly filling the filling material;
The bellows and raising method for existing concrete earth retaining walls.   The bellows of the existing concrete earth retaining wall according to claim 1 or 2, wherein in the bellowing process, the bellowing operation for the lowermost step portion of the side wall of the concrete wall to be bellyed of the existing concrete earth retaining wall is omitted. Attaching / lifting method.   The side wall of the concrete wall to be applied to the existing concrete earth retaining wall is the concrete wall side of either the downstream side or the upstream side of the earth retaining wall body. The method of bellows and raising of existing concrete earth retaining walls.   4. The existing concrete wall side according to claim 1, wherein the concrete wall side surface of the existing concrete earth retaining wall body is a concrete wall side surface on both the downstream side and the upstream side of the earth retaining wall body. Abdomen / lifting method for concrete earth retaining wall.   The box-shaped frame for bellows and the box-shaped frame for raising formed by combining prefabricated steel framework members each form a skeleton of a ramen structure or a truss structure. The bellows and raising method of the existing concrete earth retaining wall described in 1.   The screen material for preventing the outflow of filling material to be attached to the box form for bellows and the box form for raising is made of steel or wood, and the filling material is locally generated material such as stone, rake, earth and sand. The bellows / raising method of the existing concrete earth retaining wall according to claim 1 or 2, wherein

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