JP7293568B2 - Construction method of structures - Google Patents

Description

The present invention relates to a construction method for structures.

A trench cut method is known in which the outer periphery of an underground structure is constructed in advance and the outer periphery of the underground structure is used as a retaining wall (for example, see Patent Document 1).

JP-A-5-133108

By the way, there is a case where a structure including a new underground structure is constructed next to an in-service underground structure in plan view. In this case, when the ground adjacent to the in-service underground structure is excavated in plan view, the excavated area and the surrounding ground may rise. As a result, the in-service underground structure may also be lifted up, and the in-service underground structure may be affected.

Similarly, there is a case where an existing underground structure next to an in-service underground structure in plan view is demolished and a structure equipped with a new underground structure is constructed. In this case, when the existing underground structure is demolished, there is a possibility that the demolished area and the surrounding ground will rise. As a result, the in-service underground structure may also be lifted up, and the in-service underground structure may be affected.

SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to suppress the uplift of an underground structure during service.

A structure construction method according to a first aspect is a structure construction method for constructing a structure having a new underground structure adjacent to an in-service underground structure in a plan view, wherein the new underground structure an in-service underground structure side construction step of constructing the in-service underground structure side by a reverse construction method; and a remainder construction step for constructing the remainder of the body.

According to the structure construction method according to the first aspect, first, in the in-service underground structure side construction step, the in-service underground structure side of the new underground structure is constructed by the reverse casting method. Next, in the remainder construction step, the remainder of the new underground structure is constructed adjacent to the in-service underground structure side of the constructed new underground structure.

As described above, in the present invention, construction is performed first on the side of the underground structure that is in service in the new underground structure. As a result, lifting of the excavated area and the surrounding ground is suppressed compared to the case where the entire excavated area of the new underground structure is excavated at the same time. Therefore, the lifting of the underground structure during service is suppressed.

In addition, by constructing the in-service underground structure side of the new underground structure by the reverse construction method, compared with the case of constructing the in-service underground structure side of the new underground structure by the forward construction method, and the uplift of the ground around them is further suppressed. Therefore, the lifting of the underground structure during service is further suppressed.

A structure construction method according to a second aspect is the structure construction method according to the first aspect, wherein in the in-service underground structure side construction step, an excavation area in which the new underground structure is to be constructed is The first region of the underground structure is excavated while being partitioned into a first region where the in-service underground structure side is constructed and a second region where the remainder is constructed by a temporary retaining wall.

According to the structure construction method according to the second aspect, in the in-service underground structure side construction process, the in-service underground structure side of the new underground structure is constructed in the excavation area where the new underground structure is to be constructed. The first area and the second area where the remainder of the new underground structure will be constructed are partitioned by a temporary retaining wall, and the first area of the excavation area is excavated in this state. As a result, the first area can be easily excavated prior to the second area of the excavation area.

A structure construction method according to the third aspect is a structure construction method in which an existing underground structure adjacent to an in-service underground structure in plan view is dismantled and a structure having a new underground structure is constructed. an in-service underground structure side construction step of dismantling the in-service underground structure side of the existing underground structure and constructing the in-service underground structure side of the new underground structure by a reverse construction method; and a remaining portion construction step of dismantling the remaining portion of the existing underground structure and constructing the remaining portion of the new underground structure adjacent to the in-service underground structure side of the new underground structure.

According to the structure construction method according to the third aspect, first, in the in-service underground structure side construction process, the in-service underground structure side of the existing underground structure is dismantled, and the new underground structure is constructed by the reverse construction method. During service, the underground structure side will be constructed. Next, in the remainder construction process, the remaining portion of the existing underground structure is dismantled, and the remainder of the new underground structure is constructed adjacent to the in-service underground structure side of the new underground structure.

As described above, in the present invention, construction is performed first on the side of the underground structure that is in service in the new underground structure. That is, in the present invention, the in-service underground structure side of the existing underground structure is dismantled first. As a result, compared to the case where the entire existing underground structure is demolished at the same time, the uplift of the ground around the demolished region of the existing underground structure is suppressed. Therefore, the lifting of the underground structure during service is suppressed.

A structure construction method according to a fourth aspect is the structure construction method according to the third aspect, wherein in the in-service underground structure side construction step, the existing underground structure is placed on the in-service underground structure side and the The existing underground structure is demolished on the side of the in-service underground structure while being separated from the remaining part by a partition wall.

According to the structure construction method according to the fourth aspect, in the in-service underground structure side construction process, the existing underground structure is partitioned into the in-service underground structure side and the remaining part by the partition wall, and in this state, the existing underground structure The underground structure side will be dismantled while the underground structure is in service. As a result, the in-service underground structure side of the existing underground structure can be easily dismantled prior to the remaining portion of the existing underground structure.

As described above, according to the present invention, it is possible to suppress the lifting of an underground structure during service.

1 is a vertical cross-sectional view showing ground to which a structure construction method according to a first embodiment is applied; FIG. 1 is a vertical cross-sectional view showing a new structure constructed by a construction method for a structure according to the first embodiment; FIG. It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 1st embodiment. It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 1st embodiment. FIG. 4 is a vertical cross-sectional view showing an existing structure to which the method for constructing a structure according to the second embodiment is applied; It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 2nd embodiment. It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 2nd embodiment. It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 2nd embodiment. It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 2nd embodiment. It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 1st embodiment.

(First embodiment)
First, the first embodiment will be explained.

As shown in FIG. 1, the structure construction method according to the present embodiment is applied to the ground 12 on which an underground structure 16 is provided during service. The in-service underground structure 16 is, for example, a railroad (subway) or a road in service, and is buried in the ground 12 (underground).

At least a part of the in-service underground structure 16 may be buried in the ground 12 .

(Structure)
As shown in FIG. 2, in this embodiment, the ground 12 (excavation area R) next to the in-service underground structure 16 is excavated to construct (construct) the new structure 20 . The new structure 20 consists of multiple layers, and is arranged adjacent to the in-service underground structure 16 in a plan view.

The new structure 20 is constructed by having a plurality of columns 22 , a plurality of beams 24 constructed between adjacent columns 22 , and a floor slab 26 supported by the beams 24 . The pillars 22 inside the new structure 20 are supported by the structural column piles 21, and the pillars 22 on the outer periphery of the new structure 20 are supported by the retaining wall 30 described later. In addition, it is also possible to construct a structure column pile under the outer peripheral column 22 and support the outer peripheral column 22 on the structure column pile.

The new structure 20 has a new underground structure 20A provided in the ground 12 and a new aboveground structure 20B provided on the ground. A new underground structure 20A is provided in an excavation area R of the ground 12 . A new above ground structure 20B is provided on the new underground structure 20A.

In addition, the new underground structure 20A and the new aboveground structure 20B may be of a single layer. Also, the new structure 20 may have at least the new underground structure 20A, and the new aboveground structure 20B may be omitted. Also, the new structure 20 is an example of a structure.

(Construction method for structures)
Next, an example of a construction method for a structure will be described.

In the structure construction method according to the present embodiment, first, the outer peripheral portion 20Y of the new structure 20 on the side of the in-service underground structure 16 is constructed by the reverse hammering method. Next, the body portion 20X of the new structure 20 other than the outer peripheral portion 20Y is constructed. Hereinafter, the construction method of the structure according to this embodiment will be specifically described.

In addition, the outer peripheral portion 20Y of the new structure 20 referred to here refers to one span or more of the new structure 20 on the side of the underground structure 16 in service in a longitudinal section including the underground structure 16 in service and the new structure 20. means a part (one column-beam frame part). In addition, the outer peripheral portion 20Y of the new structure 20 is an example of (part of) the in-service underground structure side of the new structure. Also, the body portion 20X of the new structure 20 is an example of the remainder of the new structure.

(Earth retaining wall construction process)
First, the retaining wall construction process will be described. As shown in FIG. 1 , in the mountain retaining wall construction process, an earth retaining wall 30 is constructed on the outer periphery of the excavation region R of the ground 12 . The retaining wall 30 is formed, for example, in a frame shape in plan view so as to surround the excavation region R. As shown in FIG. Of the earth retaining walls 30, the earth retaining wall 30A on the side of the underground structure 16 in service is arranged to face the underground structure 16 in service.

The earth retaining wall 30 is formed of, for example, a diaphragm wall (concrete wall), a soil improvement wall (soil cement wall), or a steel wall such as a main pile horizontal sheet pile.

(Construction process on the underground structure side during service)
Next, the construction process on the side of the underground structure that is in service will be described. As shown in FIG. 1, in the in-service underground structure side construction process, the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse construction method. Specifically, first, in the excavated region R of the ground 12, a temporary earth retaining wall 34 is constructed so as to face the earth retaining wall 30A. The temporary retaining wall 34 is, for example, a steel wall such as a parent pile lateral sheet pile. The temporary retaining wall 34 divides the excavation area R into a first area RY on the side of the in-service underground structure 16 and a second area RX other than the first area RY.

The first region RY is the region where the main body portion 20X of the new structure 20 is constructed, and the second region RX is the region where the outer peripheral portion 20Y of the new structure 20 is constructed. Moreover, the temporary retaining wall 34 is not limited to a steel wall such as a parent pile horizontal sheet pile, but may be a diaphragm wall (concrete wall) or a soil improvement wall (soil cement wall).

Next, as shown in FIG. 3, the first region RY of the excavation region R is excavated by a heavy machine or the like (not shown) while leaving the second region RX, and the outer peripheral portion 20Y of the new structure 20 is formed by the reverse construction method. to construct. Specifically, first, below the root cut bottom R1 of the first region RY, the piles 21 for the structural columns are constructed, and the structural columns 22 are driven on the piles 21 for the structural columns.

Next, the first region RY is excavated (primary excavation) to a predetermined depth, and the first-floor beams 24 and floor slabs 26 of the outer peripheral portion 20Y of the new structure 20 (new ground structure 20B) are constructed. At this stage, the beams 24 and the floor slabs 26 of the main body 20X of the new structure 20 may be supported by the structural columns 22. In this case, these beams 24 and floor slabs 26 function as earth retaining shoring to support earth retaining wall 30A and temporary earth retaining wall 34 .

Next, the first region RY is excavated (secondary excavation, tertiary excavation, quaternary excavation, etc.) to a predetermined depth (40L), and the outer peripheral portion 20Y of the new underground structure 20A is sequentially constructed. In parallel with construction of the outer peripheral portion 20Y of the new underground structure 20A, the outer peripheral portion 20Y of the new aboveground structure 20B is sequentially constructed. Specifically, on the plurality of structure columns 22, the first floor pillars 22 of the outer peripheral portion 20Y of the new ground structure 20B are constructed, and the second floor beams 24 and floor slabs 26 of the new ground structure 20B are constructed. do. By repeating this procedure, the outer peripheral portion 20Y of the new structure 20 is constructed.

(Remainder construction process)
Next, the remainder construction process will be described. As shown in FIG. 4, in the remaining construction process, the body portion 20X of the new structure 20 is constructed adjacent to the outer peripheral portion 20Y of the new structure 20 by the reverse hammering method. Specifically, first, a plurality of structure column piles 21 are constructed below the root cut bottom R1 of the second region RX, and a structure structure column 22 is driven on each structure column pile 21. do.

Next, the second region RX is excavated (primary excavation) to a predetermined depth, and the first floor beams 24 and floor slabs 26 of the main body portion 20X of the new structure 20 (new ground structure 20B) are constructed. The first floor beam 24 and the floor slab 26 of the main body 20X of the new structure 20 are supported by the structural column 22 . These beams 24 and floor slabs 26 also function as earth retaining shoring to support earth retaining walls 30 and temporary earth retaining walls 34 .

Next, the second region RX is excavated to a predetermined depth (secondary excavation, tertiary excavation, quaternary excavation, . Also, in parallel with the construction of the main body portion 20X of the new underground structure 20A, the main body portion 20X of the new aboveground structure 20B is sequentially constructed. Specifically, the first floor pillars 22 of the main body 20X of the new ground structure 20B are constructed on the plurality of structure columns 22, and the second floor beams 24 and floor slabs 26 of the new ground structure 20B are constructed. do. By repeating this procedure, the main body part 20X of the new structure 20 is constructed. After that, the temporary retaining wall 34 is removed. Note that the temporary retaining wall 34 may be removed if the body portion 20X and the outer peripheral portion 20Y of the new underground structure 20A are structurally connected.

It should be noted that the rest of the construction process can be carried out at a stage when the weight of the outer peripheral portion 20Y of the new structure 20 under construction can limit the uplift of the underground structure 16 in service to within a predetermined value, and the new structure does not necessarily need to be carried out. There is no need to wait for the completion of the outer peripheral portion 20Y of the object 20; Also, although not shown, a concrete underground outer wall may be appropriately constructed inside the retaining wall 30 .

(Action and effect)
Next, the operation and effects of this embodiment will be described.

For example, as indicated by a two-dot chain line L1 in FIG. The surrounding ground 12 may rise. If the ground 12 around the excavation area R rises, the underground structure 16 may rise during use.

As a countermeasure, in this embodiment, first, in the in-service underground structure side construction process, the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse construction method prior to the main body portion 20X of the new structure 20. That is, prior to the second region RX of the excavation region R, the first region RY is excavated.

As a result, as indicated by the two-dot chain line L2 in FIG. 3, the weight of the ground 12 in the second region RX left in the excavation region R suppresses the uplift of the excavation region R and the ground 12 in the vicinity thereof. . Furthermore, the weight of the outer peripheral portion 20Y of the new structure 20 constructed in the first region RY of the excavation region R also suppresses the uplift of the excavation region R and the ground 12 therearound. Therefore, the floating of the underground structure 16 during service is suppressed.

In addition, in the in-service underground structure side construction process, the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse construction method. As a result, after excavating the first region RY of the excavation region R to the excavation bottom R1, compared with the case of constructing the outer peripheral portion 20Y of the new structure 20 (sequential construction method), the underground structure 16 is further suppressed.

Furthermore, in the construction process on the side of the underground structure during use, a temporary retaining wall 34 is temporarily installed in the excavation area R, and the excavation area R is divided into the first area RY for the outer peripheral portion 20Y of the new structure 20 and the main body of the new structure 20. The first region RY of the excavation region R is excavated while being separated from the second region RX for the portion 20X by the temporary retaining wall 34 . As a result, the first region RY can be easily excavated prior to the second region RX of the excavation region R.

Next, in the remaining portion construction step, the ground 12 of the second region RX remaining in the excavation region R is excavated, and the main body portion 20X of the new structure 20 is constructed. In this rest construction process, the weight of the outer peripheral portion 20Y of the new structure 20 prevents the excavation region R and the surrounding ground 12 from lifting until the main body portion 20X of the new structure 20 is constructed. Therefore, the floating of the underground structure 16 during service is suppressed.

Furthermore, in the in-service underground structure side construction process, the main body portion 20X of the new structure 20 is constructed by the reverse construction method. As a result, after excavating the second region RX of the excavation region R to the root cutting bottom R1 (see FIG. 2), compared to the case of constructing the main body portion 20X of the new structure 20 (sequence construction method), Uplift of the semi-underground structure 16 is further suppressed.

(Second embodiment)
Next, a second embodiment will be described. In addition, in the second embodiment, members having the same configuration as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

As shown in FIG. 5, the structure construction method according to the present embodiment is applied to the ground 12 on which the underground structure 16 in service and the existing structure 40 are provided. The existing structure 40 has an existing underground structure 40A and an existing aboveground structure 40B. Also, the existing structure 40 includes a plurality of pillars 42 , beams 44 that span adjacent pillars 42 , and floor slabs 46 that are supported by the beams 44 .

The existing underground structure 40A is arranged adjacent to the in-service underground structure 16 in plan view. An existing ground structure 40B is provided on the existing underground structure 40A. The existing structure 40 may have at least the existing underground structure 40A, and the existing aboveground structure 40B may be omitted.

(Construction method for structures)
Next, an example of a construction method for a structure according to this embodiment will be described.

In the structure construction method according to the present embodiment, the existing structure 40 is dismantled and the new structure 20 is constructed. In other words, the method for constructing a structure according to this embodiment is used when the existing structure 40 is reconstructed. At this time, in this embodiment, first, the main body portion 40X of the existing structure 40 is left, and the outer peripheral portion 40Y of the existing structure 40 on the side of the in-service underground structure 16 is reconstructed. After that, the body part 40X of the existing structure 40 is rebuilt. As a result, floating of the underground structure 16 during service is suppressed.

Further, in this embodiment, the depth of the new underground structure 20A is shallower than the depth of the existing underground structure 40A. Therefore, the portion (lower portion 40L) of the existing underground structure 40A that is deeper than the new underground structure 20A is not dismantled and is used as the foundation of the new underground structure 20A. Hereinafter, the construction method of the structure according to this embodiment will be specifically described.

(Construction process on the underground structure side during service)
First, the construction process on the side of the underground structure that is in service will be described. As shown in FIG. 6, in the in-service underground structure side construction process, first, the retaining wall 30 is constructed around the outer circumference of the existing underground structure 40A. Next, a temporary partition wall 48 is constructed on each floor of the existing underground structure 40A to be demolished (to be demolished).

It is also possible to omit the retaining wall 30 and use the underground outer wall 40W of the existing underground structure 40A as the retaining wall.

The temporary partition wall 48 is, for example, a concrete wall or a steel wall, and is arranged on the in-service underground structure 16 side of the existing underground structure 40A. The temporary partition wall 48 partitions the existing underground structure 40A into an outer peripheral portion 40Y on the side of the in-service underground structure 16 and a main body portion 40X other than the outer peripheral portion 40Y. The outer peripheral portion 40Y of the existing underground structure 40A is an area where the outer peripheral portion 20Y of the new underground structure 20A is constructed, and the main body portion 40X of the existing underground structure 40A is constructed by the main body portion 20X of the new underground structure 20A. area.

Next, as shown in FIG. 7, the outer peripheral portion 40Y of the existing structure 40 is dismantled with a heavy machine (not shown) while leaving the main body portion 40X. Constructed by hammering method.

Specifically, first, the structural column 22 is constructed on the lower portion 40L of the outer peripheral portion 40Y of the existing underground structure 40A. Next, the existing underground structure 40A is dismantled (primary dismantling) to a predetermined depth by a heavy machine or the like (not shown), and the first-floor beams 24 and floor slabs 26 of the outer periphery 20Y of the new structure 20 are constructed.

The first floor beam 24 and the floor slab 26 of the main body 20X of the new structure 20 are supported by the structural column 22 . Also, these beams 24 and floor slab 26 function as earth retaining shoring for supporting the existing underground structure 40A (underground outer wall 40W).

Next, the first region RY is dismantled (secondary dismantling, tertiary dismantling, etc.) to a predetermined depth, and the outer peripheral portion 20Y of the new underground structure 20A is sequentially constructed. In parallel with construction of the outer peripheral portion 20Y of the new underground structure 20A, the outer peripheral portion 20Y of the new aboveground structure 20B is sequentially constructed. Specifically, on the retaining wall 30A and the structure column 22, the first floor column 22 of the outer peripheral portion 20Y of the new ground structure 20B is constructed, and the second floor beam 24 and the floor slab 26 of the outer peripheral portion 20Y are constructed. to construct. By repeating this procedure, the outer peripheral portion 20Y of the new structure 20 is constructed.

It should be noted that the outer peripheral portion 40Y of the existing underground structure 40A is an example of the in-service underground structure side of the existing underground structure.

(Remainder construction process)
Next, the remainder construction process will be described. As shown in FIG. 8, in the remaining construction process, the main body portion 40X of the existing underground structure 40A of the existing structure 40 is dismantled by a heavy machine (not shown) or the like, and the main body portion 20X of the new structure 20 is constructed. After that, the temporary partition wall 48 is removed.

It should be noted that the rest of the construction process can be carried out at a stage when the weight of the outer peripheral portion 20Y of the new structure 20 under construction can limit the uplift of the underground structure 16 in service to within a predetermined value, and the new structure does not necessarily need to be carried out. There is no need to wait for the completion of the outer peripheral portion 20Y of the object 20;

Also, although not shown, concrete underground outer walls and underground pillars may be appropriately constructed inside the retaining wall 30 . Also, the body portion 40X of the existing underground structure 40A is an example of the remaining portion of the existing underground structure.

(Action and effect)
Next, the operation and effects of this embodiment will be described.

According to the structure construction method according to the present embodiment, as shown in FIG. The outer peripheral portion 20Y on the side of the underground structure 16 during use is constructed by the reverse hammering method.

As a result, the weight of the remaining main body portion 40X of the existing structure 40 suppresses uplift of the demolished area of the existing underground structure 40A and the surrounding ground 12 . Furthermore, the weight of the outer peripheral portion 20Y of the constructed new structure 20 also suppresses uplift of the demolished area of the existing underground structure 40A and the surrounding ground 12 . Therefore, the floating of the underground structure 16 during service is suppressed.

In addition, in the in-service underground structure side construction process, the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse construction method. As a result, compared to the case where the outer peripheral portion 40Y of the existing structure 40 is dismantled from the lower portion 40L or shallower and then the outer peripheral portion 20Y of the new structure 20 is constructed (sequential construction method), the construction of the underground structure 16 during service is Floating is further suppressed.

Furthermore, in the underground structure side construction process during service, a temporary partition wall 48 is temporarily installed in the existing underground structure 40A, and the existing underground structure 40A is partitioned into the outer peripheral portion 40Y and the main body portion 40X. The outer peripheral portion 40Y of 40A is dismantled. As a result, the outer peripheral portion 40Y of the existing structure 40 can be easily dismantled prior to the main body portion 40X of the existing structure 40. As shown in FIG.

Next, as shown in FIG. 8, in the remainder construction process, the main body part 40X of the remaining existing structure 40 is dismantled, and the main body part 20X of the new structure 20 is constructed. In this in-service underground structure side construction process, until the main body part 20X of the new structure 20 is constructed, the outer peripheral part 20Y of the new structure 20 controls the dismantling area of the main body part 40X of the existing structure 40 and its demolition area. Uplift of the surrounding ground 12 is suppressed. Therefore, the floating of the underground structure 16 during service is suppressed.

Also, in the remaining construction process, the main body portion 20X of the new structure 20 is constructed by the reverse construction method. As a result, compared to the case where the body portion 20X of the new structure 20 is constructed after demolishing the lower portion 40L or less of the body portion 40X of the existing structure 40 (sequential construction method), the construction of the underground structure 16 during service is reduced. Floating is further suppressed. However, the main body part 20X of the new structure 20 can be constructed by either the forward casting method or the reverse casting method.

(Modified example of the second embodiment)
Next, a modified example of the second embodiment will be described.

In the modification shown in FIG. 9, the depth of the new underground structure 20A is deeper than the depth of the existing underground structure 40A. In this case, a temporary partition wall 48 is temporarily installed in the existing underground structure 40A to partition the existing underground structure 40A into the outer peripheral portion 40Y and the main body portion 40X. In addition, a temporary retaining wall 52 is temporarily installed in the ground 12 deeper than the existing underground structure 40A to divide it into a first area RY and a second area RX. This makes it possible to easily construct the outer peripheral portion 20Y of the new underground structure 20A prior to the main body portion 20X of the new underground structure 20A.

The temporary partition wall 48 and the temporary earth retaining wall 52 may be formed of, for example, a diaphragm wall (concrete wall), a ground improvement wall (soil cement wall), a steel wall such as a main pile lateral sheet.

(Modified example of the first and second embodiments)
Next, modified examples of the first embodiment and the second embodiment will be described. Various modifications will be described below using the first embodiment as an example, but these modifications can also be applied to the second embodiment as appropriate.

As in the modification shown in FIG. 10, a water tank 60 as a weight may be temporarily installed on the outer peripheral portion 20Y of the new underground structure 20A in the in-service underground structure side construction process. As a result, uplift of the underground structure 16 that is in service can be further suppressed. Also, by using the water tank 60 as the weight, it becomes easier to carry in and remove.

At least one water tank 60 can be installed in the outer peripheral portion 20Y of the new underground structure 20A. Further, the weight is not limited to the water tank 60, and other members may be used.

In the first embodiment described above, the outer peripheral portion 20Y of the new structure 20 is located at the side of the in-service underground structure 16 of the new structure 20 in the longitudinal section including the in-service underground structure 16 and the new structure 20. It is considered as a span part. However, the outer peripheral portion of the new structure 20 is, for example, one span portion (multiple span portions) on the side of the in-service underground structure 16 in a longitudinal section including the in-service underground structure 16 and the new structure 20. Also good.

In addition, in the above-described first embodiment, the in-service underground structure 16 is arranged only on one side of the new structure 20, but the above-described first embodiment is not limited to this. A plurality of in-service underground structures may be arranged, for example, around a new structure (structure). In this case, in the in-service underground structure side construction process, for example, each of the plurality of in-service underground structure sides of the new underground structure is constructed by the reverse construction method.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate. It goes without saying that various aspects can be implemented without departing from the scope.

16 Underground structure in service 20 New structure (structure)
20A new underground structure 20X main body (remainder of new underground structure)
20Y Periphery (underground structure side in service in new underground structure)
40A Existing underground structure 40X Main body (remaining part of existing underground structure)
40Y Peripheral part (underground structure side in service in the existing underground structure)
48 partition wall

Claims (2)

A structure construction method for dismantling an existing underground structure adjacent to an in-service underground structure in plan view and constructing a structure having a new underground structure,
an in-service underground structure side construction step of dismantling only the in-service underground structure side of the existing underground structure and constructing the in-service underground structure side of the new underground structure by a reverse construction method;
a remainder construction step of dismantling the remaining part of the existing underground structure and constructing the remaining part of the new underground structure adjacent to the in-service underground structure side of the new underground structure;
Construction method of a structure comprising In the in-service underground structure side construction step, the in-service underground structure side of the existing underground structure is separated from the remaining part by a partition wall. dismantle the side,
A construction method for a structure according to claim 1 .

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