JP2019138003A - Reconstruction method - Google Patents

Abstract

To provide a reconstruction method capable of shortening a construction period.SOLUTION: A lower part 10L of an old structure 10, which is a part at and below a prescribed height, is surrounded by a wall W of a temporary tent until an upper part of the old structure 10, which is a part at and above the prescribed height, is completely dismantled from the top. Then, the temporary tent is completed by making a roof atop the wall W. Inside the temporary tent, underground construction is performed including dismantling the lower part 10L of the old structure and dismantling an underground structure of the old structure 10.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a rebuilding method for a structure.

  Structures (structures include buildings, condominiums, and other structures, and other bridges, expressway bridge girders, etc.) will deteriorate over time, so it will be necessary to rebuild them at appropriate times. In recent years, as a part of city planning, rebuilding of structures is often performed regardless of whether or not the structures have deteriorated over time.

By the way, although it is not necessarily limited in the case of rebuilding, the request | requirement about the cost reduction and construction period from the owner in the case of performing construction becomes severe year by year. Therefore, the person who undertakes the dismantling of the structure and the rebuilding by construction hopes to continue the construction for 24 hours every day if possible. A delay in the construction period leads to a surge in labor costs and lease fees for heavy machinery, so shortening the construction period is a very important issue in terms of cost reduction. However, there is a reason why it is not possible to proceed with construction without interruption.
First, there is a problem of noise regulation. Noise regulation is naturally strict, especially for nighttime noise. Therefore, it is difficult to continue the construction for 24 hours, especially in the city, and it is almost impossible to continue the construction for 24 hours especially at night.
Next, there are problems that occur based on the weather. Construction is often canceled (postponed) in the case of rainy weather, for example. The reason is, for example, to ensure the safety of the worker, and it is difficult to perform work such as placing liquid concrete performed during construction and curing it in rainy weather. If the construction is canceled, the construction period will naturally increase and the construction cost will increase. In addition, when the structure created by rebuilding is a building in particular, the structure is mostly a structure that is an underground part of the structure, such as a basement or an underground passage. It is natural. In such a structure having an underground structure, it is necessary to perform construction work in an underground space formed by digging the ground. The impact of this is greater than the work on the ground. For example, if rain falls in the basement, it is necessary to remove the groundwater. In addition, as the underground excavation progresses, it is necessary to build a solid gantry, but there is a risk of an electric shock even on a rainy day, so the excavation work will stop because the gantry's reinforcement welding work cannot be performed, and the construction period will be delayed. May occur.
There is also a problem with the regulation of the working environment. In recent years, not only regulations on noise but also regulations on the working environment of workers working at construction sites have become increasingly strict. For example, it is becoming more and more mandatory for companies that employ workers to give workers sufficient rest and holidays. Of course, many workers can be gathered. For example, if workers can be worked in three shifts, it would be possible to have the work done 24 hours a day, but that was done. In some cases, if the above-mentioned construction is canceled, personnel costs will increase.
For these reasons, it is difficult to shorten the construction period.

  The present invention is intended to solve at least a part of the problems described above, and at least provides a rebuilding method capable of realizing a shortening of the construction period.

In order to solve the above-mentioned problems, the present inventor proposes the following invention.
The present invention is a rebuilding method in which an old structure which is a structure built in a predetermined target range is dismantled and a new structure which is a new structure having a structure underground is built in the target range.
The rebuilding method is executed after a first old ground part dismantling process for dismantling a first old ground part, which is a ground part above a predetermined height of the old structure, and the first old ground part dismantling process. A second old ground part dismantling process that dismantles a second old ground part that is a ground part below a predetermined height of the old structure, and the target range that is executed after the second old ground part dismantling process is dug down Including an underground construction execution process for performing at least an operation for constructing the structure of the new structure and a ground part construction process for constructing the ground part of the new structure. It is out. And in this rebuilding method, before the said 1st old aboveground part decomposition | disassembly process is completed, while covering the said target range to the said predetermined height with the wall of the temporary tent of a planar view rectangle, said 2nd old aboveground part decomposition | disassembly Before the process is started, the temporary tent is closed to cover the target area by providing a roof of the temporary tent on the wall, the second old ground part dismantling process, and the underground work The execution process is executed in a closed space surrounded by the temporary tent.

This rebuilding method involves dismantling the old structure that was built in the target area and building a new structure in the target area. This is the rebuilding method used in the rebuilding mode typically seen when redevelopment takes place. The number of old and new structures need not be the same. For example, there may be a plurality of old structures and one new structure.
In this rebuilding method, the target area is covered with a wall of a temporary tent having a rectangular shape in plan view until the first old ground part dismantling process is completed to approximately the predetermined height. The wall will be made by the time the first old aboveground dismantling process ends. The first old ground part dismantling process is a process of disassembling a portion of the old structure located above the predetermined height. In other words, the first old ground disassembly process is executed regardless of the progress of the construction of the wall of the temporary tent. The method of dismantling the old ground part executed in the first old ground part disassembling process may be the same as in the prior art. The wall of the temporary tent is constructed while the first old ground part dismantling process is being performed or before the first old ground part dismantling process is being performed. Therefore, the wall of the temporary tent has already been constructed when a certain work has been performed from at least the second half of the first old ground disassembly process. Since it is the upper part of the wall of the temporary tent that is dismantled in the first old ground dismantling process, the wall of the temporary tent does not contribute so much to noise countermeasures, but it functions sufficiently from at least an aesthetic point of view. .
In this rebuilding method, a temporary tent that covers the target area in a closed manner is completed by providing a roof of a temporary tent on the wall before the second old ground disassembly process is started. And in the rebuilding method of this invention, a 2nd old ground part decomposition | disassembly process and an underground construction execution process are performed in the closed space enclosed by the temporary tent. Among these, the second old ground part dismantling process involves dismantling a part of the old structure that is relatively close to the ground surface, and thus noise problems are likely to occur. If the second old ground part disassembly process is performed in the temporary tent, although it depends on the sound insulation property of the temporary tent, sound leakage to the surroundings can be reduced. There is a possibility that construction in the partial disassembly process can be carried out even at night. Even if the underground construction execution process is performed in a temporary tent, it is possible to prevent the leakage of noise caused by the execution of the underground construction execution process. Therefore, there is a possibility that the underground construction execution process can be performed even at night. is there. This also contributes to shortening the construction period. In addition, if the second old ground dismantling process and the underground construction execution process are executed inside the temporary tent, even if it is raining, the second old ground dismantling process and the underground construction execution process are performed. It is possible to execute the work in dry as dry construction in a dry environment. This also shortens the construction period. In particular, the underground construction process is most susceptible to rain. By executing this underground construction execution process in the temporary tent, according to the rebuilding method of the present application, the underground construction execution process is executed according to the scheduled construction schedule while minimizing the influence of the weather. Will be able to. The fact that it is possible to carry out the underground construction execution process as planned not only contributes to shortening the construction period, but also the number of workers secured when the construction is canceled due to rain. It is possible to prevent a situation in which costs are wasted. The underground construction execution process generally takes a relatively longer construction period than the first old ground part decomposition process, the second old ground part decomposition process, and the ground part construction process. Therefore, by shortening the time required for the long underground construction execution process, it is possible to greatly shorten the entire period for implementing the rebuilding method.
The temporary tent includes an aggregate serving as a framework and a sheet that covers or stretches between the aggregates, and the configuration itself may be the same as the conventional one. The sheet needs to be waterproof to prevent rain from entering, and particularly preferably has translucency to ensure daytime workability, and preferably has sound insulation.

The underground construction execution process may include a process of constructing the structure of the new structure inside the temporary tent.
However, the underground construction execution process may include other processes. For example, since a pile for supporting a new structure (for example, a cast-in-place pile) is hit from the ground, the work of hitting the pile is not included in the underground construction execution process. However, the underground construction execution process may include a process of hitting a cast-in-place pile that supports the new structure. That is, in this rebuilding method, the cast-in-place pile may be struck from the bottom of the underground space formed by digging down the target range. The construction method used for driving the cast-in-place pile may be a conventional construction method.

  A portion of the new structure that can be constructed in the enclosed space surrounded by the temporary tent may be constructed in the enclosed space. That is, in the rebuilding method according to the present application, a part of the ground partial construction process may be executed in a closed space surrounded by a temporary tent. Although the height of the new structure that can be constructed in the enclosed space surrounded by the temporary tent is limited by the height of the temporary tent, work on the part of the new structure close to the ground surface is likely to cause noise problems. It makes sense to build only the lower part of the new structure in a temporary tent.

The roof of the temporary tent can be constructed as follows, for example.
For example, among the walls of the temporary tent, roof rails along the upper ends of the two walls are arranged at two upper ends that are parallel to each other when viewed in plan. And, the work of providing the roof of the temporary tent on the wall, a divided roof corresponding to an object obtained by dividing the roof in a length direction of the roof rail, on one end side of the roof rail One after the other, at least one of the divided roofs assembled on one end side of the roof rail, except the last one, is sent to the other end side of the roof rail on the roof rail, and the new divided This can be done by connecting the roof to the split roof located on the other end side of the roof rail of the split roof.
When constructing the above-mentioned divided roof, since the divided roof is constructed at a high place, a heavy machine capable of performing work at a high place, for example, a crane car is required. If a split roof is constructed on one end of the roof rail and moved to the other end of the roof rail, the place where heavy equipment such as crane trucks should be placed can be fixed near one end of the roof rail. it can. This is advantageous when there is not enough land around the target area where the rebuilding method is performed. When trying to build a roof while moving heavy equipment from one end side to the other end side of the above-mentioned roof rail, such heavy equipment may not be able to move. Such a problem is unlikely to occur if the divided roof is moved.

The roof of the temporary tent is such that the cross-sectional shape perpendicular to the length direction of the roof rail is the same in all locations, and each of the divided roofs is the same except for the last one. It is also possible.
In this way, a large number of divided roofs that are the same are repeatedly constructed, so that work efficiency is expected to be improved. The last split roof may be the same as the previous split roof, but the other will depend on the length of the roof rail of the temporary tent roof that will eventually be built. The length of the split roof may be different. “Each of the divided roofs is the same except for the last one” means that this is possible.

When constructing the wall of the temporary tent, the wall may be fixed to the old structure. By providing the roof of the temporary tent at the upper end of the wall, the wall is stably upright. On the other hand, in the absence of a roof, the wall can be upright but may lack its stability.
By performing so-called wall joining, which fixes the wall to the old structure, it is possible to make the wall stand upright in a stable state even before the roof exists.

  In the case where there is one old structure, the old structure may have a floor area above the predetermined height that is smaller than a floor area below the predetermined height. The rebuilding method of the present application can be applied to old structures that employ a so-called setback structure, for example, where the floor area of the low-rise part where the store enters is large and the floor area of the high-rise part where the office enters is relatively small It is. The temporary tent may have a height of, for example, 50 m or more. And the switching part of the low layer part and high layer part of the structure which is set back is in a position lower than 50 m in most cases. If the upper part of the structure set back in the first old ground part decomposition process is dismantled and the lower part of the structure set back in the second old ground part decomposition process is dismantled, The following advantages can be obtained. In other words, when the old structure is set back so that the floor area is narrower at the switching part at a certain height, the higher part is smaller than the lower part, the structure at the switching part. Since there is a high possibility that there is a change, it is often easier to separate the higher layer portion and the lower layer portion. Therefore, even if the higher-layer part than the switching part is removed while the wall of the temporary tent is supported by the lower part of the old structure than the switching part, it is lower than the switching part of the old structure. It can be said that there is little possibility that the wall of the temporary tent supported by the part is less affected because the part is less affected. As another aspect, although the construction of the wall of the temporary tent and the first old ground part disassembly process can be performed in the first place, the parts above and below the switching part are structurally related to each other. Therefore, if the dismantling of the higher layer than the switching part of the structure and the construction of the wall of the temporary tent are performed in parallel, the risk of both operations affecting each other is reduced. It can be pointed out that the wall of the temporary tent can be reliably connected to the lower part of the switching part of the old structure.

The top view of the object range including the building used as an example of the old structure before rebuilding in one Embodiment, and its periphery. The perspective view of the object range and building which were shown in FIG. The side view seen from the arrow A direction in FIG. 1 about the ground and underground part of the building shown in FIG. The side view of the same range as FIG. 3 which shows the state after the high-rise part of the building shown in FIG. 1 was demolished. The perspective view which shows the state after the high-rise part of the building shown in FIG. 1 was demolished. The perspective view for demonstrating the construction method of the roof of the temporary tent which covers the object range shown in FIG. The perspective view for demonstrating the construction method of the roof of the temporary tent which covers the object range shown in FIG. The perspective view for demonstrating the construction method of the roof of the temporary tent which covers the object range shown in FIG. The perspective view which shows the state which the roof completed on the wall of the temporary tent which covers the object range shown in FIG. The top view which expands and shows the vicinity of the target range which shows the state where the cast-in-place pile was struck in the specific range among the target ranges shown in FIG. The side view seen from the arrow A direction in FIG. 1 which shows the process in the case of hitting a cast-in-place pile in the specific range of the object range shown in FIG. The side view which shows the same range as FIG. 11 which shows the process in the case of hitting a cast-in-place pile in the specific range of the object ranges shown in FIG. The side view which shows the same range as FIG. 11 which shows the process in the case of hitting a cast-in-place pile in the specific range of the object ranges shown in FIG. The side view which shows the same range as FIG. 11 which shows the state after hitting a cast-in-place pile in the whole range in the specific range among the target ranges shown in FIG. The side view seen from the arrow B direction in FIG. 1 which shows the state after hitting a cast-in-place pile in the whole range in the specific range among the object ranges shown in FIG. The side view which shows the same range as FIG. 15 which shows the state after providing the gantry after becoming the state shown in FIG. The side view which shows the same range as FIG. 15 which shows the state after carrying in a bulldozer in order to form an underground space. The side view which shows the same range as FIG. 15 which shows the state in the middle of the formation of underground space. The side view which shows the same range as FIG. 15 which shows the state after underground space is completed. The side view which shows the same range as FIG. 15 which shows the process for driving a cast-in-place pile to the place outside the specific range in underground space after underground space is completed. The side view which shows the same range as FIG. 15 which shows the state after the process for hitting a cast-in-place pile to the place outside the specific range in underground space is complete | finished. The top view which shows the same range as FIG. 10 which shows the state after the process for hitting a cast-in-place pile to the place outside the specific range in underground space is complete | finished. The side view which shows the same range as FIG. 15 for demonstrating the process of constructing the underground part of a new building. The side view which shows the state same as FIG. 15 which shows the state which completed the process of constructing the underground part of a new building. The side view which shows the same range as FIG. 15 for demonstrating the process of building the ground part of a new building. Side view for explaining the process of building the ground part of a new building. The top view which shows the positional relationship used as an example of a roof rail and a column member.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

This embodiment demonstrates the case where the old structure which is the structure built in a certain site is demolished, and the new structure which is a structure is built in the site where the old structure existed. That is, in this embodiment, a rebuilding method for rebuilding an old structure to a new structure will be described.
In this embodiment, the old structure has a structure underground. The old structure is dismantled together with the structure. In addition, a new structure that is newly established has a structure in the basement.

1 to 3 show an old structure 10 to be dismantled from now on. 1 is a plan view, FIG. 2 is a perspective view, and FIG. 3 is a side view from the direction of arrow A in FIG.
The old structure 10 is, but is not limited to, a so-called setback building in this embodiment. The old structure 10 includes an old ground portion 10A that is a portion above the ground surface. The old ground portion 10A includes a low layer portion 10L up to a predetermined height and a high layer portion 10H above a predetermined height. The floor area of the low-rise part 10L is wider than that of the high-rise part 10H. The edge of the low layer portion 10L is in a state of protruding from the edge of the high layer portion 10H over the entire circumference. The low-rise part 10L corresponds to, for example, a commercial facility floor, and the high-rise part 10H corresponds to, for example, an office floor.
The old structure 10 includes an old underground portion 10B located in the basement, which is the structure described above. The former ground part 10A is a known or well-known building ground part, and the former underground part 10B is a known or known building underground part. The old underground portion 10B is typically a basement or an underground passage.
The old structure 10 which is a building is built in a section surrounded by a road 15 (FIG. 1). The shaded range marked with X in the section is a new structure later, and this is also a range where a new structure, which is one building, is not limited to this, This corresponds to the target range in the present invention. A plurality of cast-in-place piles, which will be described later, are struck as needed over the entire area within the target range. Although not limited thereto, the target range X is a horizontally long rectangle that is long in the left-right direction in FIG. 1 in this embodiment.
As shown in FIG. 3, an old pile 10 </ b> C that is a pile that supported the old structure 10 exists under the old underground portion 10 </ b> B of the old structure 10. It does not matter whether the old pile 10C is a cast-in-place pile.

When performing the rebuilding work, first, the old structure 10 is disassembled.
The old structure 10 is disassembled from the old ground portion 10A. The dismantling of the former ground portion 10A can be performed by a conventional construction method.

  First, of the old ground portion 10A, the high-rise portion 10H is disassembled. The dismantling of the high-rise part 10H may be basically dismantled in the same manner as in the prior art, and this is the case in this embodiment. The only difference is that in the rebuilding method according to this embodiment, the wall W of a temporary tent, which will be described later, is constructed before the dismantling of the high-rise part 10H is completed. The wall W is constructed to have a rectangular shape in plan view so as to surround the target range X. The height of the wall W is set so as to correspond to the height of the portion of the old ground portion 10A in the old structure 10 where the low layer portion 10L and the high layer portion 10H are switched. In this embodiment, the height of the wall W is set to be somewhat higher than the height of the portion where the low layer portion 10L and the high layer portion 10H are switched. The wall W only needs to be constructed before the dismantling of the high-rise part 10H is completed, and may be constructed before the dismantling of the high-rise part 10H is started, or may be constructed while dismantling the high-rise part 10H. Absent. Since the time required for constructing the wall W is generally shorter than the time required for dismantling the high-rise part 10H, even if the wall W starts to be constructed after the dismantling of the high-rise part 10H is started, the high-rise part 10H is usually used. Completed before the dismantling of is complete.

The wall W forms a part of the temporary tent. The wall W is composed mainly of the sheet 230. The wall W includes a column 221 that supports the sheet 230. Note that the wall W is connected to the lower layer portion 10L of the old ground portion 10A of the old structure 10 by a wall connecting material to be described later.
The column 221 is a rod-like member extending in the vertical direction, and functions as an aggregate that supports the temporary tent or the sheet 230. The lower end of the column 221 is fixed to a column base (not shown). The pillar foundation is for preventing the wall W or the temporary tent from moving by being blown by the wind, and it may be configured as much as possible, and a known or well-known configuration is adopted for it. can do. The column foundation is made of, for example, a concrete block or an iron steel material such as H steel.
The column 221 is a rod-shaped member extending in the vertical direction, but does not have to be configured by a single rod-shaped body, and may be configured by combining a plurality of members, for example, in a truss structure. For example, the pillars 221 are sub-columns that are four rod-like bodies extending vertically, the lower ends of which are positioned on four vertices of a predetermined square when viewed in plan, and the sub-columns have a truss structure. It may be configured by combining rod-shaped reinforcing members connected to each other, and this is not limited to this, but this is the case in this embodiment.
The columns 221 are erected at predetermined intervals along the outer sides of predetermined two sides of the target range X (see FIG. 5). The distance between two adjacent pillars 221 may or may not be the same in all parts, but in this embodiment, the distance between two adjacent pillars 221 is the same in all parts. It comes to become.
The sheet 230 is stretched between adjacent columns 221. The sheet 230 may be, for example, a resin sheet or a sheet in which at least one surface of a woven or knitted fabric made of fibers is coated with a resin. Examples of the resin constituting the sheet 230 are vinyl chloride resin, polyethylene, and the like, and the thickness thereof is, for example, 0.5 mm to 2.0 mm. The sheet 230 can be wound or folded, and both of them are possible in this embodiment. The sheet 230 is not necessarily a single sheet, and may be a sheet formed by bonding a plurality of sheet materials by heat fusion or the like. The sheet 230 preferably has a certain degree of translucency in order to maintain the brightness in the temporary tent 200, and sound based on work performed in the temporary tent 200 leaks out of the temporary tent 200. In order to prevent this, it is preferable to have a certain level of sound insulation. It is possible to make the sheet 230 have a double structure mainly for the purpose of improving the sound insulation. In selecting the sheet 230, necessary functions such as weather resistance are taken into consideration. The property of the sheet 230 is also applicable to the sheet 240 described later.
In FIG. 5, the sheet 230 stretched between two adjacent columns 221 among a large number of columns 221 standing along the long side of the target range X having a rectangular shape in plan view is the two columns 221. It is a rectangle that is long in the vertical direction and has a shape and size corresponding to the range of the rectangle sandwiched between the two. Such a rectangular sheet 230 is stretched over all portions between two adjacent columns 221 among a large number of columns 221 standing along the long side of the target range X. The method of stretching the sheet 230 between the two pillars 221 or fixing the edge in the width direction of the sheet 230 to the two pillars 221 may be a known or well-known method, and thus detailed description is omitted. .
In FIG. 5, the sheet 240 is also stretched along the short side of the target range X that is rectangular in plan view. The sheet 240 is stretched between those at the end of the plurality of pillars 221 set along the target range X. The sheet 240 in this embodiment is rectangular. The method of stretching the sheet 240 between the two columns 221 or fixing the edge in the width direction of the sheet 240 to the two columns 221 may be a known or well-known method.
The seat 240 is provided with at least one openable / closable door 241 as necessary. The door 241 is for a heavy machine or an operator to enter and exit the temporary tent 200, and the configuration thereof may be in accordance with a known or well-known technique.
As a result of stretching the sheet 230 and the sheet 240 as described above, the target range X is surrounded by the wall W. In the space surrounded by the wall W, the lower layer portion 10L of the old structure 10 remains.
Here, the wall W is connected to the lower layer portion 10L of the old structure 10 by the wall connecting material 260 as shown in FIG. The wall connecting member 260 has a function of connecting the wall W and the lower layer portion 10L of the old structure 10, and may be configured in any manner as long as it is possible. Due to the presence of the wall connecting material 260, the wall W is stably and independent. However, if the roof described later is provided on the wall W, the wall W will stand up stably without the wall connecting material 260. Therefore, the wall connecting material 260 loses almost its function when a roof exists. The wall connecting material 260 may be a known or well-known one, but the wall connecting material 260 in this embodiment, which is an example, is a rod-shaped body, one end of which is a column 221 and the other end is a low-rise part. It can be fixed by screwing to 10L. Note that when the sheet 240 is stretched, it is possible to appropriately provide columns and beams (not shown) between the two columns to which they are fixed. When such a beam exists, the beam and the lower layer portion 10 </ b> L of the old structure 10 may be connected by the wall connecting material 260.
As described above, the wall W only needs to be constructed before the dismantling of the high-rise part 10H ends, and may be constructed before the dismantling of the high-rise part 10H is started. At least noise leaking from the dismantling of the high-rise part 10H after the wall W is constructed is prevented from leaking out by the wall W. In addition, due to the presence of the wall W, the beauty around the target range X in which the rebuilding method is being performed is maintained.

Next, a roof is provided on the wall W. The roof may have a known or well-known structure as a temporary tent roof, and may be constructed by a known or well-known method for constructing a temporary tent roof.
In this embodiment, the roof of the temporary tent is constructed by the following method.

The roof of the temporary tent in this embodiment is provided on the roof rail WR provided on the wall W. In this embodiment, the roof rail WR is a long material extending over the entire length in the length direction at the upper end of the wall W along the long side of the target range X. That is, in this embodiment, when the wall W is viewed in plan, it extends on the two long sides of the rectangular wall W and extends in the length of the two long sides in parallel. Two horizontal roof rails WR are arranged. The roof rail WR is made of, for example, H steel, and is fixed to the column 221 located below the roof rail WR.
The roof rides on the roof rail WR. As will be described later, in this embodiment, the roof is constructed by combining a plurality of divided roofs. The split roof is placed on the roof rail WR, and as a result, the roof is placed on the roof rail WR.

The configuration of the divided roof 210 will be described. The divided roof 210 has an aggregate 220. The aggregate 220 serves as a framework of the divided roof 210 and supports the sheet 230 that covers the temporary tent. The structure of the aggregate 220 may be the same as a known or known one. The aggregate 220 in this embodiment is perpendicular to the roof rail WR when viewed in plan, and is arranged with a predetermined interval. Although not limited to this, the interval between the aggregates 220 is constant in this embodiment, and the aggregates 220 are connected to each other by members (not shown) to maintain the constant interval. It is supposed to be. The interval between the aggregates 220 may or may not be the same as the interval between the columns 221 included in the wall W. However, in this embodiment, the interval between the aggregates 220 is the same as the interval between the columns 221. Yes.
The divided roof 210 has the same cross-section in a plane perpendicular to the length direction of the roof rail WR in all parts. Moreover, all the structures of the aggregate 220 contained in each division | segmentation roof 210 are the same. Moreover, all the divided roofs 210 except for the divided roof 210 constructed at the end have the same structure.
In this embodiment, the number of aggregates 220 included in one divided roof 210 is four, but this is not limited thereto. The split roof 210 forms a temporary tent roof by moving them on the roof rail WR as will be described later. If the number of aggregates 220 included in the split roof 210 is large, the split roof 210 is divided. Since the frequency | count of the movement of the roof 210 can be reduced, the burden of the operation | work regarding the movement of the division | segmentation roof 210 and work time reduce. However, since the weight of the divided roof 210 is increased by increasing the number of aggregates 220 included in the divided roof 210, the size of the divided roof 210 or the number of aggregates 220 included in the divided roof 210 can be moved. It is limited by the weight of the divided roof 210, and is also limited by the size of the assembly location of the divided roof 210 assembled as described later.
Each aggregate 220 includes a short column member 221X extending in the vertical direction and a beam 222 supported by the column member 221X. Both the column member 221X and the beam 222 are rod-shaped, but need not be configured by a single rod-shaped body, and may be configured by combining a plurality of members, for example, in a truss structure. The beam 222 in this embodiment constitutes the roof of the temporary tent 200, and the two are connected with an inclination so that the center is higher. As a result, the completed temporary tent 200 has a gable roof as shown in FIG. 9, but the roof structure of the temporary tent 200 is not limited to this. The completed temporary tent 200 can cover the entire target range X, and it is necessary that a heavy machine (for example, a crane truck) described later can work inside the target range X. As for the size of the temporary tent 200, for example, the long side may exceed 100 m, and the height may exceed 50 m.
As described above, the column member 221X rides on the roof rail WR. The column member 221X supports the divided roof 210 in a stable state with its lower end in contact with the roof rail WR. But when the width | variety of the roof rail WR is small, a restriction | limiting may arise also in the thickness of the column member 221X which can be supported by each roof rail WR. Then, there is a possibility that the strength of the column member 221X and the divided roof 210 may be limited.
In order to eliminate such a restriction, for example, the roof rails WR arranged on the wall W outside the two long sides of the target range X are each set in parallel with each other. It is possible. In this case, as shown in FIG. 27, one pillar member 221X rides on the roof rail WR that is a set of two. The lower end of the column member 221X is placed on the set of roof rails WR. What is indicated by the reference numerals 221A shown in FIG. 27 is a cross section of the column 221A constituting one column member 221X. The column 221A is a steel frame, for example, and extends in the vertical direction. Although not limited to this, the four column bodies 221A included in one column member 221X in this embodiment are in a positional relationship such that they are positioned on the vertices of a predetermined square when viewed in plan, and the roof It rides on the rail WR. The column member 221X in this case is configured by appropriately fixing, for example, a beam-shaped reinforcing member that forms a truss structure between the four vertical column bodies 221A. In that case, it is usual that the beam is similarly constituted by a truss structure.

  A sheet 230 is stretched between the aggregates 220. The sheet 230 can be the same as the sheet 230 constituting the wall W described above, and in this embodiment, this is not limited thereto.

  In this embodiment, the split roof 210 is assembled on the end of one side (the right side in FIG. 6) of the roof rail WR. A heavy machine, for example, a crane, necessary for assembling the divided roof 210 is disposed in the vicinity of one end of the roof rail WR.

In this embodiment, both the column member 221X and the beam 222 are configured by assembling a number of members in a truss shape. The two column members 221X of each aggregate 220 are assembled on the one end of the two roof rails WR. Next, the base ends of the two beams 222 are connected to the upper ends of both column members 221X, the beams 222 are extended with an upward slope toward the center direction of the roof rail WR, and the ends of the beams 222 are connected to each other. The Thereby, the aggregate 220 is completed. This operation is performed on the four aggregates 220.
Next, the aggregates 220 are connected by the above-described members (not shown) so that the intervals between the aggregates 220 are kept constant. Then, the sheet 230 is stretched between two adjacent aggregates 220.
Thus, the 1st division | segmentation roof 210 is constructed | assembled on the one end side of the roof rail WR (FIG. 6).

Next, the first divided roof 210 is slid and moved to the other end side of the roof rail WR as indicated by an arrow in FIG. The method of moving the divided roof 210 can be a known or well-known technique, and the power used for moving the divided roof 210 on the roof rail WR can be selected as appropriate. In this embodiment, although not limited to this, a hydraulically driven cylinder jack is used as power, for example, the cylinder jack body is fixed at an appropriate position on the roof rail WR, and the divided roof 210 is fixed to the cylinder jack body. The roof 210 is fixed to a cylinder that translates in the length direction of the roof rail WR, and the operation of translating the cylinder is repeated with respect to the main body, thereby dividing the divided roof 210 by a distance corresponding to the moving distance of the cylinder. Do this by moving.
As a result, the divided roof 210 is moved to the other end side of the roof rail WR (FIG. 7).

Next, similarly to the first divided roof 210, the second divided roof 210 is constructed on one end side of the roof rail WR through the same process as the first divided roof 210. The construction of the second divided roof 210 may be started during the movement of the first divided roof 210, and this is the same thereafter.
Similarly to the first divided roof 210, the constructed second divided roof 210 is moved on the roof rail WR toward the other end side of the roof rail WR.
The second divided roof 210 is connected to the first divided roof 210 near the other end of the roof rail WR. There are two methods for connecting the second divided roof 210 and the first divided roof 210, and one of them is adopted.
In the first method, among the aggregates 220 of the first divided roof 210, the rearmost one in the traveling direction of the divided roof 210 and the aggregate 220 of the second divided roof 210, The first thing considered in the traveling direction of the divided roof 210 is connected as it is. In that case, the aggregate 220 of the connected portion is twice as thick as the other aggregates 220 in the traveling direction of the divided roof 210. If you dislike it, among the aggregates 220 of each divided roof 210, the thickness considered in the traveling direction of the divided roof 210, which is the front and the rearmost one in the traveling direction of the divided roof 210, It can be used as half of the aggregate 220. By doing so, it becomes possible to make the thickness of the aggregate 220 of the connected part the same as the thickness of the aggregate 220 of the other part.
In the second method, first, among the aggregates 220 of the first divided roof 210, the rearmost one considered in the traveling direction of the divided roof 210 and the aggregate 220 of the second divided roof 210. Among them, the second divided roof 210 is advanced until there is an interval corresponding to the distance between the aggregates 220 in each divided roof 210 with respect to the foremost one in the traveling direction of the divided roof 210. Then, among the aggregates 220 of the first divided roof 210, the rearmost one in the traveling direction of the divided roof 210 and the divided roof 210 among the aggregates 220 of the second divided roof 210. The sheet 230 is stretched in the same manner as in the case where the divided roof 210 is formed with respect to the previous one in the traveling direction. In this case, among the aggregates 220 of the first divided roof 210, the rearmost one in the traveling direction of the divided roof 210 and the aggregate 220 of the second divided roof 210 of the divided roof 210. You may arrange | position the member mentioned above for keeping the distance of these two aggregates constant between the ones considered in the advancing direction.
Regardless of which method is used, the second divided roof 210 is connected to the first divided roof 210.

Similarly, a third divided roof 210, a fourth divided roof 210, a fifth divided roof 210,... Are constructed on one end side of the roof rail WR, and the other of the roof rail WR is placed on the roof rail WR. After sending it to the end side, it is connected to the divided roof 210 just before that (FIG. 7).
The last divided roof 210 may not be sent on the roof rail WR. Finally, the roof of the temporary tent 200 that extends over the substantially entire length of the roof rail WR is substantially completed (FIG. 8).
In this state, there are open portions at the front and the rear when the moving direction of the divided roof 210 of the temporary tent 200 is considered. In this embodiment, the opened portion is covered with a pentagonal sheet 242 to complete the temporary tent 200 that completely covers the target range X (FIG. 9). The sheet 242 can be different from the sheet 230 only in shape, which is the case in this embodiment. The method of fixing the seat 242 to the front and rear aggregates 220 of the temporary tent 200 may be in accordance with known or well-known techniques. Note that the timing for stretching the sheet 242 may not be after the temporary tent 200 is in the state shown in FIG.

The following steps of the rebuilding method are executed in the temporary tent 200.
First, the lower layer portion 10 </ b> L in the old ground portion 10 </ b> A of the old structure 10 is disassembled in the temporary tent 200. Such dismantling can be performed in the same manner as in the prior art, but in this embodiment it is not limited to this.
As is the case when the high-rise part 10H is dismantled, the debris generated by dismantling the low-rise part 10L of the old ground part 10A is carried out from the target range X to the outside. Such unloading of rubble may be performed by a known or well-known technique.
Thereafter, the entire target range X is leveled. When leveling the target range X, if there is a space in the old underground portion 10B, it is preferable to refill the space. For example, the space in the old underground portion 10B can be backfilled with a floor slab, a concrete recycled crushed stone generated by crushing the old ground portion 10A, or the like.

Next, a pile foundation for a new structure, which is a new structure built by rebuilding, is constructed. The new structure is a building built in the target range X, as will be described later. The pile foundation for one building which is a new structure is a cast-in-place pile.
As shown in FIG. 10, the cast-in-place pile 20 </ b> C hit here is hit only within a specific range Y that is a part of the target range X. FIG. 10 is a plan view of the target range X, but the temporary tent 200 is not shown. The specific range Y is a range covered by a gantry described later, in other words, a range located on the lower side of the gantry.
With reference to FIGS. 11-15, the concrete method of placing the cast-in-place pile 20C is demonstrated. In addition, what is necessary is just to follow the well-known or well-known technique how to place the place-stake pile 20C. In addition to driving the cast-in-place pile 20C in the specific range Y this time, a scene of hitting the cast-in-place pile 20C once again appears later. In addition, FIGS. 11-14 is a side view of the target range X also including the underground seen from the direction seen by the arrow shown by A in FIG. FIG. 15 is a side view of the target range X including the underground as seen from the direction indicated by the arrow indicated by B in FIG. FIGS. 11 to 14 and FIG. 15 are all schematic, and for the convenience of drawing, FIG. 10 lacks accuracy particularly with respect to the number of cast-in-place piles 20C.
As shown in FIG. 11, first, the pile driving machine 300 is placed at a predetermined position on the leveled ground surface corresponding to the position where the cast-in-place pile 20 </ b> C in the specific range Y should be hit in the target range X. The pile driver 300 has a function of making a hole vertically toward the basement and a function of pouring concrete. These functions may be assigned to a plurality of devices, and in that case, the pile driving machine 300 is constituted by a plurality of devices.
Then, the hole 301 is dug in the vertical direction by the pile driver 300. If the hole 301 interferes with the old underground part 10B of the old structure 10 or the old pile 10C, the hole 301 is dug toward the underground while penetrating them. The hole 301 is dug up to a position where the strength sufficient to support the building where the cast-in-place pile 20C is built later is obtained. In general, the hole 301 is often dug until reaching a hard ground. It is also possible to make the diameter near the bottom of the hole 301 larger than the part above it.
Next, in the hole 301, a metal cage, generally made of a reinforcing bar, not shown in the figure, is provided along the inner wall of the hole 301. The car extends from the bottom of the hole 301 to a predetermined height. Then, liquid concrete is poured into the hole 301 from the pile driving machine 300. The concrete fills from the bottom of the hole 301 to the upper end of the car. When the concrete hardens, it becomes a cast-in-place pile 20C (FIG. 12). A cage | basket | car becomes a reinforcement which guarantees the intensity | strength in the cast-in-place pile 20C. When the diameter near the bottom of the hole 301 is larger than the portion above the hole 301, the cast-in-place pile 20 becomes a bottom-expanded pile.
Next, the pile driver 300 is moved to another place, and the hole 301 is similarly drilled. And like the above-mentioned case, a cast-in-place pile 20C is obtained by putting a cage into the hole 301, pouring concrete into the hole 301 and hardening it (FIG. 13).
By repeating the above, the cast-in-place pile 20C is struck over the entire area of the specific range Y as shown in FIGS. In addition, in this embodiment, although the depth (height position) of the lower end of the cast-in-place pile 20C shall be equal, this is not this limitation. The depth of the lower end of each cast-in-place pile 20C is determined from the viewpoint of whether each cast-in-place pile 20C has sufficient strength to support a building to be built later. Moreover, in this embodiment, although the depth (height position) of the upper end of the cast-in-place pile 20C shall be equal, this is not this limitation, either. The depth of the upper end of each cast-in-place pile 20C is the height corresponding to the lower surface of the portion where each cast-in-place pile 20C is present in an underground part to be described later of a building that will be made later. As a result, the cast-in-place pile 20C supports the underground part of the building as a structure from below.
In addition, in a general cast-in-place pile method, when the upper end of the cast-in-place pile is underground, the upper part of the cast-in-place pile is usually backfilled. Since this portion is removed together with the surrounding earth and sand as will be described later, there is no need to perform such backfilling.
In this example, there is one pile driving machine 300, and the cast-in-place piles 20C are driven one by one, but a plurality of cast-in-place piles 20C are simultaneously used in parallel by using a plurality of pile-driving machines 300. Of course, it is possible to strike at the same time. Of course, it is better if you want to shorten the construction period.
Moreover, the operation | work which strikes the cast-in-place pile 20C in the specific range Y here is performed on the ground. Such work is not necessarily performed after the temporary tent 200 is completed. Before the temporary tent 200 is made, or in parallel with the operation of constructing the temporary tent 200, an operation of hitting the cast-in-place pile 20 in the specific range Y may be performed. In particular, when the work for placing the cast-in-place pile 20C in the specific range Y is performed in parallel with the work for constructing the temporary tent 200, the effect of shortening the work period is great. In addition, the specific range Y is not limited to the range below the gantry described later, and the specific range Y can be determined as a range in which it is difficult to hit the cast-in-place pile 20 from the bottom of the underground space described later. .

The subsequent operation will be described with reference to FIGS. Among these, the drawing method of FIG. 22 is based on FIG. 10, and the drawing method of other figures is based on FIG.
When the cast-in-place pile 20C is struck over the entire specific range Y as described above, the gantry 410 is then installed (FIG. 16).
The gantry 410 is a pedestal on which heavy machinery, vehicles, and workers ride and perform work. The gantry 410 needs to be strong and wide enough to do so. The gantry 410 in this embodiment is plate-shaped. The gantry 410 may be only when it is first constructed, or may include the minimum upper portion of the support described later. The gantry 410 covers the specific range Y described above. The specific range Y in this embodiment is rectangular as shown in FIG. 10, but this is not necessarily limited to this, and the length of the specific range Y covers the entire length of the target range X in the longitudinal direction. There is no need. However, a part of the gantry 410 needs to be in contact with a part of the outer edge of the target range X so that a vehicle or the like can enter the gantry 410 from outside the target range X. For example, in this embodiment, it is convenient to contact the gantry 410 and the edge of the target range X at a portion where the door 241 of the temporary tent 200 is located, but this embodiment is not limited thereto. So it is.

When the gantry 410 is constructed on the leveled surface, the entire target range X is dug down to form an underground space. When the excavation of the target range X is started, the temporary tent 200 is completed. The work performed in the temporary tent 200 including the excavation of the target range X can be performed continuously for 24 hours every day, for example, in three turns if the soundproofing performance of the temporary tent 200 and the surrounding environment permit. Moreover, since the work in the temporary tent 200 can avoid rain by the temporary tent 200, so-called dry construction can also be executed. For dug down the target range X, a predetermined heavy machine is used. In this embodiment, the heavy machinery used for digging down the target range X is not limited to this, but is preferably a plurality of bulldozers 510 (FIGS. 17 and 18). Other heavy equipment such as a power shovel may be used for this work.
When the entire target range X is dug down by the bulldozer 510, a space appears by removing earth and sand. This is the underground space S. When the underground space S is formed, if the old underground portion 10B of the old structure 10 and the old pile 10C exist there, they are destroyed and removed together with the earth and sand. Since it is possible to remove the old structure 10B and the old pile 10C together with the earth and sand, the labor and time spent for this work are not so great. The earth and sand, the destroyed old underground part 10B and the old pile 10C are removed from the underground space S. In this embodiment, this is done by pulling up earth and sand to the top of the gantry 410 by a known or well-known earth remover 520 arranged at the bottom of the underground space S that appears. The earth and sand pulled up on the gantry 410 by the earth remover 520 is reloaded on the loading platform of the dump truck 530 placed on the gantry 410, for example. The dump truck 530 runs on the gantry 410, exits from the door 241 of the temporary tent 200, and runs to throw away earth and sand at a predetermined place. In this way, by using the gantry 410, it becomes easy to discharge earth and sand from the underground space S to an appropriate place outside the target range X. Such earth and sand can be discharged not only in the daytime but also at night. Since it is generally unnecessary to consider vehicle traffic at night, the dump truck 530 can be traveled at a distance longer than usual as planned, and it is also easy to collect many dump trucks 530. It is useful for shortening the construction period. If it is necessary to separate the earth and sand from the destroyed old underground portion 10B and the old pile 10C, it will be easy to carry out outside the target range X, but this is not necessarily the case.
When the bottom of the underground space S is dug down, the gantry 410 naturally needs support. When the underground space S is dug down, a support body 420 is provided under the gantry 410. The support 420 may have any configuration as long as it can support the gantry 410 from below. For example, the support 420 can be configured by appropriately combining columns and beams. However, in order to reduce the number of cast-in-place piles 20C that need to be dug deeply and hit, the range of the specific range Y should be narrowed. From that viewpoint, the support 420 is a plan view. It is preferable that it exists only in a range hidden by the gantry 410. This is the case in this embodiment. The lower end of the support body 420 is in contact with, for example, the bottom of the underground space S. When the bottom of the underground space S is lowered downward, the length of the support 420 is extended downward. By doing in this way, the position of the gantry 410 does not move from the initially provided position.
When constructing the underground space S, the side surface of the underground space S is vertical, for example. The depth of the underground space S may eventually exceed 50 m, for example, and if no measures are taken, the side surface of the underground space S may collapse. In order to protect the worker who performs work in the underground space S from such danger, in this embodiment, although not limited to this, the side surface of the underground space S is reinforced by the sheet pile 430. The sheet pile 430 is configured by driving vertically elongated rectangular plates in parallel along the side surface of the underground space S. The sheet pile 430 may be a still water continuous wall or SMW. In these methods, a concrete plate is formed in the ground by placing liquid concrete in the ground and then hardening it, instead of driving the plate into the ground. For example, the sheet pile 430 covers the entire surface of the underground space S, and its lower end extends to a position deeper than the bottom of the finally formed underground space S. The sheet pile 430 has a force to push the sheet pile 430 inward from the outside toward the underground space S side, but in order to allow the sheet pile 430 to resist the force, A known earth anchor 440 may be provided outside. In this embodiment, for example, as shown in FIG. The earth anchor 440 applies an outward force and a downward force to the sheet pile 430. Such force is applied to a plurality of locations in the vertical direction of the sheet pile 430. The sheet pile 430 may be constructed before the start of excavation of the target range X for forming the underground space S, and after the excavation of the target range X is started, the side surface of the underground space S is not expected to collapse. It may be constructed at an appropriate timing.
As is well known or known, the ground anchor 440 is installed in order from the upper side as the underground space S is dug downward.

And underground space S is dug to the planned depth. The planned depth of the bottom of the underground space S is the depth at which the upper end of the cast-in-place pile 20C hit in the specific range Y and the height position thereof are aligned, or the height position of the cast-in-place pile 20C above the upper end of the cast-in-place pile 20C. Is a somewhat higher depth. In this embodiment, the bottom of the underground space S has a depth at which the upper end of the cast-in-place pile 20C struck in the specific range Y and the height position thereof are aligned (FIG. 19). In addition, the depth of the bottom of underground space S does not necessarily need to be lower than the depth in which old underground part 10B and old pile 10C exist.
Next, a cast-in-place pile 20C is newly struck at the bottom of the underground space S. The newly-placed cast-in-place 20C is struck in a range excluding the specific range Y in the target range X in a plan view. The cast-in-place pile 20C hit this time is hit from the bottom of the underground space S, not from the ground surface.
In order to hit the cast-in-place pile 20C at the bottom of the underground space S, the same pile driver 300 as described above is lowered to the bottom of the underground space S. The pile driver 300 may be one or plural. For example, the pile driving machine 300 is lowered from the top of the gantry 410 to the bottom of the underground space S by a crane 540 placed on the gantry 410 (FIG. 20).
In this case, the way of placing the cast-in-place pile 20C outside the specific range Y is the same as the way of placing the cast-in-place pile 20C within the specific range Y described above. A hole 301 (FIG. 20) is dug, a cage (not shown) is put therein, liquid concrete is poured into the hole 301, and it is hardened. Thereby, the cast-in-place pile 20C is struck. The cast-in-place pile 20C is struck as necessary over the entire area within the target range X outside the specific range Y when the bottom of the underground space S is viewed in plan (FIGS. 21 and 22). Here, the vertical length of the hole 301 dug for hitting the cast-in-place pile 20C is shorter than the vertical length of the hole 301 dug in order to hit the cast-in-place pile 20C within the specific range Y, When digging the hole 301, the old underground portion 10B and the old pile 10C do not obstruct the digging of the hole 301 or are few. Therefore, the operation of hitting one cast-in-place pile 20C outside the specific range Y takes much less time than the work of hitting the single cast-in-place pile 20C within the specific range Y. Therefore, in combination with the fact that the number of cast-in-place piles 20C struck outside the specific range Y is generally much larger than the number of cast-in-place piles 20C struck within the specific range Y, The overall time required to strike will be saved significantly.
In this embodiment, the height positions of the lower ends of the plurality of cast-in-place piles 20C struck outside the specific range Y are the same as the height positions of the lower ends of the plurality of cast-in-place piles 20C struck within the specific range Y. ing. However, this is not the case for the same reason as in the case of each cast-in-place pile 20C that is struck within the specific range Y. Further, in this embodiment, the height positions of the upper ends of the plurality of cast-in-place piles 20C struck outside the specific range Y are the height positions of the upper ends of the multiple cast-in-place piles 20C struck within the specific range Y. It's all the same. However, this is not the case for the same reason as in the case of each cast-in-place pile 20C that is struck within the specific range Y.

In this way, the necessary cast-in-place pile 20C is struck over the entire target range X in plan view.
When the cast-in-place pile 20C is struck, next, an underground portion 20B that is an underground structure of a new building is constructed (FIG. 23).
In order to construct the underground portion 20B, for example, a heavy machine placed on the gantry 410 is used. This heavy machine is, for example, a crane or a crane truck. In this embodiment, it is assumed that the heavy machine is a crane vehicle 540. The underground portion 20B is moved upward in order from the bottom of the underground space S by lowering the material (not shown) carried on the gantry 410 by a dump truck (not shown) to the inside of the underground space S by the crane truck 540, for example. Will be built for. The underground portion 20B has a known or well-known structure such as a pillar, a wall, or a floor, and is divided into a plurality of floors as necessary. Of course, an operator may get down to work in the underground space S. The bottom of the underground portion 20B is supported by the upper end of the cast-in-place pile 20C. Thereby, the underground part 20B is supported by the cast-in-place pile 20C from below.
When the underground portion 20B is constructed in the underground space S, the underground portion 20B may interfere with the support body 420 of the gantry 410. In that case, the support body 420 that interferes with the underground portion 20B may be removed, and the removed support body 420 immediately above may be fixed to the underground portion 20B. The removed support body 420 can be lifted onto the gantry 410 by, for example, a crane truck 540, and the support body 420 lifted onto the gantry 410 can be lifted by, for example, a dump truck (not shown). Just carry it out. Further, as the underground portion 20B is constructed, the earth anchor 440 is removed in order from the lower one.
In addition, you may perform the cleaning of the support body 420 of the gantry 410 as follows. In this case, the structure of the support 420 is slightly different from that described so far. In this case, the support body 420 includes a column extending in the vertical direction and a beam connecting the columns in a reinforcing manner. First, in the same manner as when the cast-in-place pile 20C is driven from the ground surface to the specific range Y, a pillar is driven from the ground surface. This operation is performed simultaneously with or before or after the operation of driving the cast-in-place pile 20C into the specific range Y. The lower end of the column reaches at least a place deeper than the bottom of the underground space S, and reaches a depth at which the gantry 410 can be stably supported by the support 420. For example, the support body 420 is arranged so that the lower end of the cast-in-place pile 20C hit in the specific range Y and the lower end thereof are aligned. The gantry 410 is installed on the pillar thus provided. Thereafter, as described above, the target range X is dug downward to form the underground space S. As the underground space S is dug, the above-described pillars that are part of the support 420 are gradually exposed from above. As the length of the exposed column becomes longer, the strength of the column becomes uneasy. Therefore, the beam is appropriately fixed to the exposed column. This work is appropriately performed while digging up the underground space S, and a sufficient number of beams are provided on the pillar. As a result, the gantry 410 and the support body 420 existing in the underground space S are the same as those shown in FIGS. 20 and 21 except that the lower end of the column is below the bottom of the underground space S. .
Also in this case, as described above, in the underground space S, the underground portion 20B is constructed from the lower side to the upper side. In this case, the support body 420 of the gantry 410 that interferes with the underground portion 20B is not removed. Even if the gantry support 420 is present, the underground portion 20B is constructed regardless of this. The subterranean portion is, roughly speaking, made of steel and cast concrete that is hardened. The support 420 is made in advance at a position where it does not interfere with the steel frame, and is partially embedded in the concrete. In the underground part 20B, for example, there is a space that becomes a corridor and a living room, a part of the support body 420 is embedded in the underground part 20B, and the remaining part of the support body 420 is exposed in the space. become. Then, at some timing, for example, at an appropriate timing after the underground portion 20B is completed, the portion of the support body 420 embedded in the underground portion 20B is left as it is and exposed to the space in the underground portion 20B. Remove only the part you are doing. Then, the cross section of the pillar or beam of the support 420 is exposed on the wall, ceiling, etc. of the underground portion 20B. If such an exposed pillar or beam cross section is an aesthetic problem, the problem of aesthetics can be solved by painting from above or by placing a wallpaper. In this way, the gantry 410 and the support 420 can be cleaned.
The work is performed as described above, and the underground portion 20B is completed in the underground space S (FIG. 24). All operations up to this point from the start of disassembly of the low-rise part 10L are performed in the temporary tent 200.

When the underground part 20B is completed, the above-ground part of the new building is constructed.
When constructing the ground part of a new building, only the temporary tent 200 or the roof of the temporary tent 200 may be removed. Moreover, if the sheet pile 430 becomes unnecessary by refilling the space between the sheet pile 430 and the underground portion 20B, the sheet pile 430 may be removed. The sheet pile 430 may be left.
The removal of the temporary tent 200 or its roof may be performed by a known or well-known technique.
When the roof of the temporary tent 200 is removed, a portion that can be made in the temporary tent 200 among the ground portion 1000 of the new building may be made in the temporary tent 200 (FIG. 26). By doing so, it will be possible to make the portion of the ground of the new building that is close to the ground without the influence of noise, and the work to build the portion of the new building without the influence of rain. become.
If the ground part of the new building can no longer be raised in the temporary tent 200, the entire temporary tent 200 may be removed, or only the roof of the temporary tent 200 may be removed. The wall W of the temporary tent 200 may be left until all the parts are completed or until the completion is near. At this time, if the wall W becomes unstable due to the removal of the roof from the temporary tent 200, the wall W is used with the ground portion 1000 of the new building and, for example, the same material as the above-described wall connecting member 260. Can be connected.
The above-ground part of the new building may be performed using, for example, a tower crane 550 provided on the base 20D for the tower crane constructed on the underground part 20B (FIGS. 25 and 26). The tower crane 550 may be a mast climbing type, but may of course be a floor climbing type. The above-ground part extends upward and is completed in due course.
A new building is completed by completing the underground part and the ground part. This completes the rebuilding of the building.

DESCRIPTION OF SYMBOLS 10 Old structure 10A Old ground part 10B Old underground part 10C Old pile 20B Underground part 20C Cast-in-place pile 20D Base 200 Temporary tent 210 Split roof 220 Aggregate 221 Column 222 Beam 230 Sheet 240 Sheet 300 Piling machine 301 Hole 410 Frame 420 Support 430 Sheet pile 440 Earth anchor 510 Bulldozer 520 Earth excavator S Underground space W Wall WR Roof rail X Target range Y Specific range

Claims (7)

It is a rebuilding method that dismantles an old structure that is a structure built in a predetermined target area and builds a new structure that is a new structure having a structure underground in the target area,
A first old ground part dismantling process for dismantling a first old ground part, which is a ground part above a predetermined height of the old structure, and the old structure executed after the first old ground part dismantling process A second old ground part dismantling process that disassembles a second old ground part, which is a ground part below a predetermined height, and a worker who digs down the target range that is executed after the second old ground part dismantling process An underground construction execution process for performing at least the work of constructing the structure of the new structure, and a ground part construction process for constructing the ground part of the new structure,
Contains
Covering the target area with the wall of a temporary tent having a rectangular shape in plan view until the first old ground part dismantling process is finished, to approximately the predetermined height,
Before the second old ground part disassembly process is started, the temporary tent that covers the target area in a closed manner is completed by providing a roof of the temporary tent on the wall;
Performing the second old ground dismantling process and the underground construction execution process in a closed space surrounded by the temporary tent;
Reconstruction method. A part of the new structure that can be constructed in the enclosed space surrounded by the temporary tent is constructed in the enclosed space.
The rebuilding method according to claim 1. The underground construction execution process is as follows:
Including a process of hitting a cast-in-place pile supporting the new structure,
The rebuilding method according to claim 1. Among the walls of the temporary tent, when arranged in plan view, the two upper ends that are parallel to each other are arranged with roof rails along the upper ends of the two walls,
The operation of providing the roof of the temporary tent on the wall,
A split roof corresponding to an object obtained by dividing the roof into a plurality of pieces in the length direction of the roof rail is successively formed on one end side of the roof rail,
Send at least one of the divided roofs assembled at one end of the roof rail to the other end of the roof rail on the roof rail.
Connecting the new split roof with the split roof located on the other end of the roof rail of the split roof;
By doing,
The rebuilding method according to claim 1. The roof of the temporary tent is configured so that the cross-sectional shape perpendicular to the length direction of the roof rail is the same in all places,
Each of the split roofs is the same except for the last one made,
The rebuilding method according to claim 4. When constructing the wall of the temporary tent, the wall is fixed to the old structure,
The rebuilding method according to claim 1. In the old structure, the floor area of the upper part above the predetermined height is smaller than the floor area of the lower part,
The rebuilding method according to claim 1.

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