JP2018178385A - Reconstruction method of concrete construction with underground skeleton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reconstruction method of a concrete construction with an underground skeleton which allows construction where neighboring buildings are adjacent to each other and allows new building processes such as decomposition of the underground skeleton and formwork to be separately performed to make the processes safe without mixing-up the processes.SOLUTION: A reconstruction method comprises: erecting shaped steels 5 in an internal peripheral of an underground skeleton whose upper ends reach the ground surface after fracturing dirt floors of the underground skeleton whose aboveground part is demolished; fracturing the underground skeleton step by step from the upper end to a lower end within a range of a height and a width which do not cause adjacent ground to breakdown, while soil retaining boards 8 connected to the shaped steels 5 are inserted to close a fractured part whenever fractured; and constructing form frames 19 using the soil retaining boards 8 as outer side concrete panels after all of fractured underground wall surfaces are covered by the soil retaining boards 8 to construct a new underground skeleton.SELECTED DRAWING: Figure 16

Description

      The present invention relates to a method of rebuilding a concrete structure having a subterranean structure for constructing a new concrete structure simultaneously with dismantling the subterranean structure of an existing concrete structure.

Conventionally, rebuilding of a concrete structure having a underground frame is performed by dismantling an existing concrete structure from the ground frame toward the underground frame, dismantling the underground frame and burying it in soil and constructing a new concrete structure. In general, it is general to re-excavate to construct a subterranean structure and to construct a ground structure after re-excavating it after pouring a shaped steel into the ground and constructing a retaining wall. In order to simplify this process, a retaining wall will be built around the existing underground structure, a construction pillar will be installed, the existing underground structure will be held and dismantled, and a new underground structure will be constructed. Proposed. (For example, refer to patent document 1.)
However, this method has the problem that the retaining wall can not be constructed if adjacent structures are in close proximity, and the work space is narrowed because work on dismantling the existing structure and new construction are performed in parallel, and the workability is poor. There was a problem that it took time to work.

JP 2001-262595 A

      The present invention solves the problems as described above, and construction is possible even if adjacent structures are close to each other, and new construction work such as crushing and dismantling of underground structures and form work can be performed separately. It is an object of the present invention to provide a rebuilding method of a concrete structure having a basement that can be safely rebuilt without crossing work.

      In the present invention, after breaking the ground of the underground frame where the ground part has been dismantled, a steel frame whose upper end reaches the ground surface is erected on the inner circumference of the underground box, and the upper end of the underground box with height and width that the adjacent ground does not collapse Crush the part from the bottom to the bottom, cover the fractured part with the retaining plate connected to the section steel every time crushing and cover all the crushed underground wall surfaces with the retaining plate, and then cover the retaining plate outside the concrete panel As a formwork to construct a new underground frame.

      A second problem solution is to use a shaped steel as a scaffold for scaffolding.

      A third problem solution means is that the earth retaining plate is connected to the shaped steel via a detachable bracket.

      A fourth solution is an assembly type in which the bracket is inserted into the attachment and the fitting at the front and rear ends of the connecting rod.

      The fifth problem solution means is that the length of the connecting rod can be adjusted by cutting it with wood.

      The operation of the first problem solving means is as follows. That is, the ground section of the underground frame where the ground part was dismantled is crushed, and a steel frame whose upper end reaches the ground surface is erected on the inner circumference of the underground box, and the underground box is constructed with height and width that the adjacent ground does not collapse. After crushing all parts from top to bottom and closing the crushing part with retaining plates connected to the section steel to prevent the collapse of the adjacent ground, after covering all underground wall surfaces with retaining plates, the retaining plates are outside Construct a formwork as a concrete panel and construct a new underground frame.

      Moreover, since the effect | action by a 2nd problem solution means makes a section steel a building frame for scaffolding, a scaffold can be constructed | assembled, without providing a scaffolding frame separately.

      In addition, the action by the third problem solution means that after attaching the detachable bracket to the section steel, the bracket is not attached to the section steel at the time of crushing work because the earth retaining plate is connected to the section steel via the bracket Because the bracket does not get in the way of crushing work.

      Further, the action of the fourth problem solving means is as follows. When the adjacent ground is closed with the retaining plate by assembling the bracket, the mounting metal and the fitting are inserted and assembled at the front end and the rear end of the connecting rod.

      The action of the fifth problem solving means assembles the bracket by cutting and adjusting the length of the connecting rod when the earth retaining plate is addressed to the crushing part.

      As described above, the ground section of the underground enclosure where the ground part was disassembled was crushed to expose the ground, and a steel frame whose upper end reached the ground surface was erected on the inner periphery of the underground enclosure to surround the inside of the underground enclosure. In addition, the basement is crushed one by one from the upper end to the lower end with a height and width that will prevent adjacent ground from collapsing, and each time the crushing is carried out, the crushed portion is closed with a retaining plate connected to a section steel surrounding the inner side of the basement. After covering all crushed underground wall surfaces with earth retaining plates, the earth frame will be disassembled from the inside in order to construct a new underground frame by constructing a formwork with the earth retaining plate as the outer concrete panel So, for example, dismantling work is possible even if the underground frame is close to the adjacent structure. In addition, in order to perform the formwork construction of a new underground frame after closing the adjacent ground with earth retaining board, the earth retaining board becomes a substitute for the concrete panel and the formwork construction interferes with other construction work, Since the space is not occupied and the work space is not narrowed, the safety is high, the work efficiency is improved, and the construction period can be shortened.

      In addition, by using the steel frame as a building frame for scaffolding, there is no need to separately install a scaffolding using a scaffolding frame at the time of dismantling work, so the working space does not become narrow and the scaffolding frame becomes unnecessary and the construction cost Can be reduced. Moreover, since a firmer scaffold can be constructed than a temporary scaffold using a frame, the work can be performed safely without shaking even when performing heavy work using an excavator or the like.

      Furthermore, adjustment of a mounting position becomes easy by having a retaining board connected to a section steel via a bracket.

      Also, by mounting the mounting metal and the latch on the front and rear ends of the connecting rod at the site, the bulky bracket can be compactly packaged as a single unit, so many bracket parts are loaded at one time. As it can be transported, shipping costs can be reduced.

      Furthermore, by making the connecting rod wooden and adjustable in length by cutting it, it is not necessary to set the erect position of the section strictly, so the erecting work of the section can be simplified and the construction time can be shortened. Construction cost can be reduced. In addition, the manufacturing cost can be reduced because it is not necessary to manufacture a large number of different connecting rods in order to cope with the positional deviation error of the shaped steel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a partially cutaway perspective view showing a underground casing in which a ground portion and a slab are disassembled. It is a partially cutaway perspective view which similarly shows the underground case which decomposed | disassembled the ground. It is a partially cutaway perspective view which shows the state which formed the drilling hole in the ground similarly and stood the shaped steel. It is a partially cutaway perspective view which shows a state which provides a scaffold similarly to shaped steel and fractures the upper end of a underground case. It is a partially cutaway perspective view which shows the state which blocked the crushing part similarly crushed by the earth retaining board. It is sectional drawing which similarly shows the state which blocked the crushing part with the earth retaining board. It is a partially cutaway perspective view which also shows the state which fractured the upper end side which follows the first crushing part similarly. It is a partially cutaway perspective view which also shows the state which blocked the adjacent crushing part similarly by the earth retaining board. It is a partially cutaway perspective view which also shows the state which blocked the corner crushing point of the underground enclosure with the earth retaining board similarly. It is sectional drawing which shows the state which blocked the crushing part of the lower stage similarly by the earth retaining board. It is sectional drawing which similarly shows the state which blocked the crushing part of the following lower stage with the earth retaining board. It is sectional drawing which shows the state which blocked the crushing part of the lowest step similarly by the earth retaining board. It is sectional drawing which shows the state which assembled the reinforcement panel of the foundation similarly, and arrange | positioned the concrete panel. Similarly, after the foundation concrete is poured, it is a cross-sectional view showing a state in which a reinforcing steel frame of the wall is assembled and a concrete panel is disposed. It is a partially notched top view which similarly shows the principal part. It is a partially cutaway perspective view which similarly shows the principal part. It is sectional drawing which shows the state which performed concrete casting of the wall similarly.

The rebuilding method of a concrete structure having the underground casing of the present invention will be described based on the embodiment shown in the drawings.
As shown in FIG. 1, after the ground part of the concrete construction is crushed and disassembled leaving the underground casing 1, the ground 2 of the underground casing 1 is crushed to expose the ground 3 as shown in FIG.

      As shown in FIG. 3, the drill hole 3a is formed in the ground 3 by an excavator and the shape steel 5 is inserted into the drill hole 3a and fixed by mortar. The arrangement interval of the shaped steels 5 is appropriately set to a width and a height that does not collapse due to crushing based on the geology of the adjacent ground 6 and the like.

      As shown in FIG. 4, a shape steel 5 whose upper end reaches the ground surface is erected at a predetermined interval on the ground 3 of the underground frame 1 to surround the underground wall, and the scaffold 4 is constructed using the shape steel 5 as a frame. The scaffold 4 includes parallel-arranged pipes 4a for linking the shaped steels 5, front and rear receiving pipes 4b fixed to the parallel pipes 4a with clamps at right angles to the parallel pipes 4 as shown in FIG. It consists of a step board 4c engaged with the front and rear receiving pipes 4b. The pipe 4 a is fixed to the flange 5 a of the shaped steel 5 by a clamp.

      The scaffold 4 built on the thus-formed stand steel 5 is extremely strong, and the scaffold does not shake or fall over even if the worker carries out the heavy work of breaking the underground casing 1 on the scaffold 4 Therefore, the underground frame 1 can be safely and accurately fractured to a width and height at which the adjacent ground 6 does not collapse. Further, the fracture site of the underground casing 1 is determined in accordance with the standing position of the shaped steel 5 to which the retaining plate 8 is attached.

      Next, as shown in FIGS. 5 and 6, when the crushed portion 17 of the underground casing 1 is closed with the earth retaining plate 8, first, the bracket 9 is attached to the shaped steel 5. The bracket 9 measures the distance from the section steel 5 to the crushing part 17 and cuts the wooden connecting rod 12 into a length corresponding to the measured distance, and then the central hole 13 penetrated through the connecting rod 12 The insert pin 10a of the mounting metal 10 is driven in and the mounting metal 10 is fixed to one end of the connecting rod 12. Subsequently, the insertion pin 11a is driven into the other end of the connecting rod 12 through the center hole 13 to fix the attachment 11. As described above, the bracket 9 assembled by assembling and fixing the mounting metal 10 and the backing metal 11 to the end of the connecting rod 12 at the site in the field is the retaining plate 8 at the position corresponding to the standing position of the shaped steel 5. Can be placed correctly.

      Next, the earth retaining plate 8 is cut in accordance with the width and height of the fractured part 17 fractured based on geology and the like. As shown in FIGS. 15 and 16, the retaining plate 8 is placed on the crushing portion 17 and formed on one side of the mounting plate 10 on the flange 5 a of the section steel 5 while abutment of the clasp 11 of the bracket 9 against the retaining plate 8. The crushing portion 17 is closed by the earth retaining plate 8 if the bracket 9 is fixed to the shaped steel 5 by tightening the flange 5a with the bolt 10c of the hooked piece 10b while slidingly engaging from the side of the hooked piece 10b .

      After closing the first crushing part 17 with the earth retaining plate 8, as shown in FIG. 7, the side adjacent to the first crushing part 17 is crushed. After crushing, as shown in FIG. 8, the earth retaining plate 8 closes the new crushing part 17 via the bracket 9 fixed to the shaped steel 5 in the same manner as described above.

      In addition, as shown in FIG. 9, the crushing portion 17 of the corner of the underground casing 1 has a retaining plate 8 formed in an L-shaped combination freely, and a bracket 9 on a section steel 5 disposed at a corner of the underground casing 1. Fix and close through.

      As shown in FIGS. 10, 11 and 12, when all crushing parts 17 at the upper end are covered with earth retaining plates 8, crushing parts 17 at the lower, next lower and lower steps are covered with earth retaining plates 8 as described above. The base portion of the underground casing 1 is also crushed and disassembled in the same manner as described above, and closed with the earth retaining plate 8 by the same method as described above.

      Next, as shown in FIG. 3, a formwork is used in which the earth retaining plate 8 is a concrete panel on the outside of the new foundation 31 and the concrete panel 21 having the thickness of the new foundation 31 is disposed inside thereof. To construct. In addition, since the formwork of the new foundation 31 is low, it is not necessary to use a separator. Concrete 32 is cast in the thus constructed mold to construct a new foundation 31 as shown in FIG. The reinforcing bar diameter of the new foundation 31 is stronger than the reinforcing bar diameter of the new base wall 30, thereby enhancing the strength.

      Once the new foundation 31 is constructed, a form 19 for forming a new underground wall 30 is constructed on the new foundation 31 as shown in FIG. In the construction of the formwork 19, first, the reinforcing bars 15 are assembled to form the reinforcing bar framework 16 in the formwork space 20.

      As shown in FIGS. 14, 15 and 16, after forming the reinforcing bar frame 16, in order to form the formwork space 20, it faces the retaining plate 8 instead of the concrete panel, and the inner concrete is spaced apart by the wall thickness. Although the panel 21 is disposed, it goes without saying that the form panel 19 may be constructed by attaching the concrete panel 21 to the front surface of the retaining plate 8. Further, as shown in FIGS. 15 and 16, the concrete panel 21 is molded by clamping and fixing the other end of the separator 24 fixed to the retaining plate 8 by the nut 22 and the washer to the concrete panel 21 with the nut 23 of the box metal 25. The interval of the frame space 20 is set firmly. Further, by inserting the longitudinal end 27 for pressing the lateral end 26 supporting the concrete panel 21 into the box metal 25 and tightening the wedge 28 with the wedge, the concrete panel 21 is pressed and held for concrete by the weight of the concrete 32 to be driven. The panel 21 is not bent.

      As shown in FIG. 17, concrete 32 is poured into the formwork space 20 to construct a new underground wall 30 for constructing a underground frame on the new foundation 31. After the concrete 32 is hardened, the formwork 19 cuts the wood connection rod 12 to remove the concrete panel 21, and then pulls the connection connection rod 12 left in the concrete 32, and the connection rod 12 is used as a catch 11. It is dismantled by pulling out from the insertion pin 11a. After dismantling, fill the mortar with mortar and close it.

Reference Signs List 1 underground frame 2 ground 3 ground 3a drilled hole 4 scaffold 4a pipe 4b receiving pipe 4c tread plate 5 steel 5a flange 6 adjacent ground 8 retaining plate 9 bracket 10 mounting metal 10a insertion pin 10b square piece 10c bolt 11 base 11a difference Built-in pin 12 Connecting rod 13 Center hole 15 Reinforcement bar 17 Reinforcement frame 17 Crushed part 19 Formwork 20 Formwork space 21 Concrete panel 22 Nut 23 Nut 24 Separator 25 Box hardware 26 Horizontal edge 27 Vertical edge 28 Wedge 30 New underground wall 31 new foundation 32 concrete

Claims (5)

      After crushing the ground of the underground frame where the ground part was dismantled, a steel frame whose upper end reaches the ground surface is erected on the inner circumference of the underground box, and the underground box is directed from the upper end to the lower end with height and width that the adjacent ground does not collapse After crushing each one and closing the crushing part with earth retaining plate connected to the section steel every time crushing and covering all underground wall surfaces crushed with earth retaining plate, form the formwork as outer concrete panel with earth retaining plate Construction method of concrete structure with underground structure characterized by constructing and building a new underground structure.       The construction method of a concrete structure having a underground frame according to claim 1, wherein the frame is a frame for a scaffold.       A construction method of a concrete structure having a underground casing according to claim 1 or 2, wherein the retaining plate is connected to the shaped steel through a detachable bracket.       The method according to claim 3, wherein the bracket is of an assembly type in which the mounting metal and the fitting metal are inserted into the front end and the rear end of the connecting rod. A construction method of a concrete structure having a underground frame according to claim 4, wherein the connecting rod is made of wood and adjustable in length by cutting.

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