Method for constructing a structure and structure

Abstract

To provide a construction method of a structure that can secure the safety in earthquake within a construction period over a long term.SOLUTION: A construction method of a structure comprises a subgrade excavation step of constructing a mountain retention wall 20 and excavating a subgrade G up to a bedding surface G1, a foundation skeleton construction step of constructing pressure-proof board concrete 30 (a foundation skeleton) on the bedding surface G1, an underground steel erection step of erecting a steel frame 40 comprising steel columns 41 and steel beams 42 on the foundation skeleton, and a preceding floor construction step of constructing a preceding floor 10 on an apex part of the steel frame 40. By constructing a ground skeleton U with the preceding floor 10 as a work frame, construction work of the ground skeleton U and an underground skeleton L conducts parallelly.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a structure composed of an above-ground body and a below-ground body with a prior floor used for a work platform as a boundary, and a construction method thereof.

Background Art

[0002] As a conventional construction method for a structure composed of a below-ground body and an above-ground body, in addition to the reverse casting method in which the below-ground and above-ground body works are carried out in parallel, a foundation is constructed on the bottom surface of an excavation groove constructed by excavating the ground, and while supporting the first floor with columns erected on this foundation, after constructing the first floor at substantially the same height as the ground surface, there is a two-stage casting method in which the construction work of the below-ground body and the above-ground body is carried out simultaneously with the first floor as a work floor (Patent Document 1).

[0003] In the reverse casting method, there is a problem that it is difficult to control the accuracy and the construction cost becomes high because excavation is carried out while embedding construction true columns that are unnecessary in the completed below-ground body, and the below-ground body is constructed from the upper floor. Further, in the above two-stage casting method, since the first floor is constructed early after constructing the foundation and erecting the steel columns, the entire excavation groove (underground space) is blocked by the first floor before constructing the below-ground body. Therefore, it is difficult to carry in the members of the below-ground body into the excavation groove using a hoisting machine such as a crane installed on the ground surface, and there is a problem that the construction efficiency may be lowered.

[0004] Therefore, the applicant has developed a structure construction method including the following respective steps (Patent Document 2). (1) An excavation groove construction step of excavating the ground and constructing an excavation groove for constructing a below-ground body. (2) A divided below-ground body construction step of constructing a divided below-ground body adjacent to the ground in a part of the excavation groove and installing a hoisting machine on the divided below-ground body. (3) A divided below-ground body extension step of extending another divided below-ground body adjacent to the divided below-ground body using the hoisting machine. A structure construction step of constructing an underground structure composed of a plurality of divided underground structures in an excavation trench and constructing a ground structure on the divided underground structures by repeating the divided underground structure addition construction process for the necessary number of times.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, even in conventional structure construction methods, due to various factors, the construction of the underground structure may take a long time. In such a case, the construction of the ground structure may proceed until the topping-out, but there is a concern that an earthquake may occur before the underground structure is completed, and safety measures for that have been required.

[0007] The present invention has been made to solve the above problems, and an object thereof is to provide a structure construction method and a structure capable of ensuring safety during an earthquake during a long construction period.

Means for Solving the Problems

[0008] In view of the above problems, the present invention provides a method for constructing a structure composed of a ground structure and an underground structure with a prior floor as a boundary. The method includes: a ground excavation step of providing a retaining wall with a core material and excavating the ground to the depth of the flooring surface; a basic structure construction step of constructing a basic structure on the flooring surface; an underground steel frame construction step of constructing a steel frame structure composed of columns and beams on the basic structure; and a prior floor construction step of constructing the prior floor provided with an outer peripheral beam around the top of the steel frame structure and joining the retaining wall and the outer peripheral beam through a shear transmission member. The construction of the ground structure is carried out using the prior floor as a working platform, so that the construction work of the ground structure and the underground structure is carried out in parallel. (Hereinafter, the method for constructing the structure may be referred to as "the present construction method".).

[0009] In the present construction method, it is preferable that main reinforcement bars, shear reinforcement bars (stirrups), and outer peripheral reinforcement bars for reinforcing around the shear transmission member are arranged in the outer peripheral beam.

[0010] In the present construction method, the outer peripheral reinforcement bars include axial bars (axial steel bars) arranged in parallel to the retaining wall, and Formed in a U-shape surrounding reinforcement bars surrounding at least a part of the shear transmission member and the shear reinforcement bars. , the surrounding reinforcing bars surround the shear transmission member and are arranged to connect the shear reinforcing bars and the shear transmission member in a manner of surrounding and holding the vertical portion on the retaining wall side of the shear reinforcing bars and the upper and lower end portions connected to the vertical portion It is preferable to have.

[0011] Here, the prior floor is a floor structure that is the boundary between the ground structure and the underground structure, and it will be used as a working platform for constructing the ground structure using the floor structure. However, the prior floor does not necessarily need to be formed exactly in accordance with the ground surface of the target ground. The shear transmission member is a member provided to transmit shear force between the outer peripheral beam and the retaining wall, and the type thereof is not limited. For example, steel bars such as studs can be used as the shear transmission member, and it is preferably joined to the core material to enhance its effect.

[0012] In addition, the surrounding reinforcement bars are reinforcing bars that are arranged around at least a part of the shear transfer member and the shear reinforcement bars, and play a role of surrounding (holding) and reinforcing (connecting) the shear transfer member and the shear reinforcement bars (including the mode of surrounding a part), and are preferably in an appropriate form such as U-shaped, C-shaped, hoop-shaped, etc. Note that for the main reinforcement bars, shear reinforcement bars, and outer peripheral reinforcement bars (axial bars and surrounding reinforcement bars) used in the outer peripheral beam, appropriate specifications and numbers can be used according to the construction situation.

[0013] In addition, there is no limitation on the structure of the retaining wall including the core material. For example, it can be constructed by the soil-cement column wall method, the diaphragm wall method, etc. Regarding the core material used, various steel materials such as H-shaped steel and I-shaped steel can be used. In addition, regarding this construction method and this structure, there is no limitation on the target structure (the content described in this paragraph is the same for the structures of the present invention described below).

[0014] According to this construction method, it includes a prior floor construction process, and a retaining wall with a core material and the prior floor are joined via an outer peripheral beam. A shear transfer member is provided at the joint between the outer peripheral beam and the retaining wall. Therefore, it is possible to firmly integrate the prior floor and the retaining wall, and thus it is possible to sufficiently ensure the safety during an earthquake during construction.

[0015] In addition, the present invention is composed of an underground structure constructed inside a retaining wall with a core material, which is above the foundation structure, and a ground structure constructed above the underground structure via a prior floor. In a structure where the construction of the ground structure and the underground structure is carried out in parallel, at the joint between the prior floor and the retaining wall , main reinforcing bars, shear reinforcing bars, and outer peripheral reinforcing bars for reinforcing the periphery of the shear transmission member are arranged an outer peripheral beam is interposed, and at the joint between the retaining wall and the outer peripheral beam, a The above shear transfer member provided on the core material and The above outer peripheral reinforcement bars are provided. is such that the outer peripheral reinforcing bars include axial bars arranged parallel to the retaining wall and surrounding reinforcing bars formed in a U-shape that surround at least a part of the shear transmission member and the shear reinforcing bars. The surrounding reinforcing bars surround the shear transmission member and are arranged to connect the shear reinforcing bars and the shear transmission member in a manner of surrounding and holding the vertical portion on the retaining wall side of the shear reinforcing bars and the upper and lower end portions connected to the vertical portion This is a structure characterized by this (hereinafter, sometimes referred to as "this structure").

[0016] Note that this structure is a structure that has been constructed or is under construction by constructing the above-ground structure and the underground structure in parallel, and is preferably constructed by this construction method, but the construction method is not limited.

[0017] In addition, although this structure has "constructing the above-ground structure and the underground structure in parallel" as a component, it is not necessary for the construction periods of the above-ground structure and the underground structure to completely coincide. As long as the construction periods of the above-ground structure and the underground structure overlap for a certain period by using the preceding floor for the construction of the above-ground structure.

[0018] According to this structure, the retaining wall with a core material and the preceding floor are joined via the outer peripheral beam, and a shear transmission member provided on the core material and outer peripheral reinforcement bars are provided at the joint between the retaining wall and the outer peripheral beam. Therefore, it is possible to firmly integrate the preceding floor and the retaining wall, and it is possible to sufficiently ensure the safety during an earthquake during construction.

Advantages of the Invention

[0019] According to the present invention, it is possible to provide a construction method and a structure of a structure that can ensure the safety during an earthquake during a long construction period.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0021] Hereinafter, with reference to the drawings, an example of an embodiment of the present construction method and the present structure K constructed by the present construction method will be described in detail. In the description based on the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0022] [The Present Construction Method] The present construction method is a construction method of the present structure K composed of a ground structure U and an underground structure L with the prior floor 10 as a boundary portion. The present construction method includes (1) a ground excavation step, (2) a foundation structure construction step, (3) an underground steel frame construction step, and (4) a prior floor construction step, and uses the prior floor 10 as a working platform to perform the construction work of the ground structure U and the underground structure L in parallel. Hereinafter, each step will be described in detail.

[0023] (1) Ground Excavation Step The ground excavation step is a step of constructing a retaining wall 20 having a core material 21, excavating the ground G to the depth of the floor surface G1 at a predetermined depth, and forming an underground space portion S for constructing the underground structure U (FIG. 1). The retaining wall 20 is constructed, for example, by using a soil mixing wall method (SMW method) or the like that forms a diaphragm wall by mixing and stirring soil and a cement-based suspension in situ, so as to surround the periphery of the underground space portion S to be excavated. Further, as the core material 21, a predetermined number of H-shaped steel materials (core materials) are arranged at predetermined intervals in the vertical direction in the retaining wall 20.

[0024] At this time, corresponding to the depth of excavation, cross beams (both not shown) are sequentially installed between the opposing retaining walls 20, and the excavation work is performed while reinforcing the retaining walls 20.

[0025] (2) Foundation Structure Construction Step The basic body construction process is a process of constructing the pressure-resistant slab concrete 30, which is the basic body, on the flooring surface G1 (Figure 2). In this embodiment, it is a pile foundation. The foundation piles 31 are driven, the pile heads are processed, and the flooring surface G1 is formed by flattening. Then, reinforcement is arranged on the upper surface of the flooring surface G1 to a predetermined thickness, and the pressure-resistant slab concrete 30 is placed. Note that it is also possible to select other foundation types depending on the ground conditions, and ground improvement may be carried out as appropriate.

[0026] (3) Underground steel frame construction process The underground steel frame construction process is a process of constructing the steel frame structure 40 on the pressure-resistant slab concrete 30 (Figure 3). This work is carried out by disassembling the shear beams (not shown) at predetermined positions below to secure the working space, and assembling the steel frame structure 40 composed of a plurality of steel columns 41 and a plurality of steel beams 42 to reach the height of the preceding floor 10.

[0027] (4) Preceding floor construction process The preceding floor construction process is a process of constructing the preceding floor 10 provided with the outer peripheral beam 50 around it at the top of the steel frame structure 40 so that the upper surface is substantially flush with the upper surface of the ground G, and joining the retaining wall 20 and the outer peripheral beam 50 via the studs 25 (shear transfer members) (Figure 4).

[0028] Note that before implementing the preceding floor construction process, it is preferable for efficient construction to previously provide a predetermined number of studs 25 at predetermined positions on the flanges of the H-shaped steel, which is the core material 21 of the retaining wall 20, so as to protrude toward the outer peripheral beam 50 side (Figure 5(b)).

[0029] The preceding floor 10 is constructed by arranging predetermined reinforcements such as main reinforcements 12 and stirrups 13 including the following outer peripheral beam 50 at the top of the steel frame structure 40 and placing the concrete 11.

[0030] The outer peripheral beam 50 is integrally provided on the entire peripheral edge portion around the preceding floor 10, and the retaining wall 20 is joined at the portion of the outer peripheral beam 50. At a location corresponding to the upper position of the peripheral beam 50 of the steel column 41, a steel beam 42' made of H-shaped steel is joined in a direction parallel to the cross bracing wall 20. And, in the vicinity of each left and right edge end of the upper and lower flange portions of the steel beam 42', a plurality of main reinforcing bars 61 are arranged horizontally, and stirrups 62 (shear reinforcement bars) that surround each of the upper and lower main reinforcing bars 61 at predetermined intervals are arranged in the height direction. Also, below the steel beam 42', a plurality of horizontal reinforcing bars 14 are arranged in a predetermined height direction in the horizontal direction, and a plurality of vertical reinforcing bars 15 are arranged at predetermined positions in the vertical direction.

[0031] At the joint portion 60 between the peripheral beam 50 and the cross bracing wall 20, peripheral reinforcing bars 65 are arranged. The peripheral reinforcing bars 65 include a plurality of axial reinforcing bars 66 arranged parallel and horizontally to the cross bracing wall 20, and a surrounding reinforcing bar 67 formed in a U-shape (Fig. 5(a)).

[0032] A plurality of the axial reinforcing bars 66 are arranged at predetermined positions in different height directions and in the direction of the preceding floor 10. In particular, the end side of the peripheral beam 50 close to the stud 25 is arranged densely. The surrounding reinforcing bar 67 is arranged so that the opening of the U-shape faces the side opposite to the cross bracing wall 20 to which it is joined, and the tip end portion is located at approximately the central portion of the peripheral beam 50. Also, the surrounding reinforcing bar 67 surrounds each stud 25, and in a manner of holding and surrounding the vertical portion on the cross bracing wall 20 side of the stirrup 62 and the upper and lower end portions connected to the vertical portion, it is arranged so as to connect the stirrup 62 and the stud 25.

[0033] And, by placing concrete 11 around each reinforcing bar and the steel beam 42', the peripheral beam 50 is formed.

[0034] After the completion of this process, using the preceding floor 10 as a working platform, the above-ground structure U is constructed upward, and below the preceding floor 10, the construction of the underground structure L is continued, and the structure K will be completed (Fig. 6).

[0035] According to this construction method, a prior floor construction process is provided. In this process, the retaining wall 20 having the core material 21 and the prior floor 10 are joined via the outer peripheral beam 50. A plurality of studs 25 attached to the core material 21 are provided at the joint portion 60 between the retaining wall 20 and the outer peripheral beam 50 for strong joining. Then, using the prior floor 10 as a work platform, the construction work of the above-ground structure U and the underground structure L can be carried out in parallel. In this way, since the prior floor 10 and the retaining wall 20 can be firmly integrated, the seismic safety of the above-ground structure U and the underground structure L during construction can be sufficiently ensured.

[0036] [This structure] This structure K is a structure composed of an above-ground structure U and an underground structure L with the prior floor 10 used as a work platform as a boundary, and is constructed by carrying out the construction of the above-ground structure U and the underground structure L in parallel (Fig. 6).

[0037] This structure K is composed of an underground structure L constructed on the upper part of the pressure-resistant disk concrete 30 constructed on the floor surface G1, a prior floor 10 constructed on the upper part of the underground structure L, and an above-ground structure U constructed on the upper part of the prior floor 10. The underground structure L is constructed in the underground space part S formed inside the retaining wall 20, and the retaining wall 20 is provided with a plurality of core materials 21 placed at predetermined intervals.

[0038] An outer peripheral beam 50 is provided on the entire periphery (surrounding) of the peripheral edge part of the prior floor 10, and the outer peripheral beam 50 and the retaining wall 20 are joined. That is, an outer peripheral beam 50 is interposed between the prior floor 10 and the retaining wall 20. And at the joint portion 60 between the retaining wall 20 and the outer peripheral beam 50, studs 25 attached to a predetermined position of the flange of the H-shaped steel which is the core material 21 and outer peripheral reinforcing bars 65 are provided (the details are the same as the description in the above construction method).

[0039] According to this structure K, the retaining wall 20 provided with the core material 21 and the preceding floor 10 are joined via the outer peripheral beam 50, and at the joint 60 between the retaining wall 20 and the outer peripheral beam 50, a plurality of studs 25 attached to the core material 21 and the outer peripheral reinforcing bars 65 are provided. Therefore, it becomes possible to firmly integrate the preceding floor 10 and the retaining wall 20, and it is possible to sufficiently ensure the safety of the upper structure U and the lower structure L during an earthquake during construction.

[0040] As described above, an example of a preferred embodiment of the present invention has been described. However, the present invention is not limited to the said embodiment, and other necessary processes may be appropriately added to each element without departing from the gist of the present invention.

[0041] As described above, there are no restrictions on the aspects of the various components related to the wooden construction method and this structure, and the optimal components can be adopted. In particular, the forms of the wooden above-ground structure, underground structure, preceding floor, foundation structure, steel frame structure, outer peripheral beam, etc. can be appropriately determined according to the embodiment. Also, regarding this construction method and this structure, the minimum necessary components are exemplified, and other processes and other components may be added as long as the effects of the present invention are not inhibited.

Explanation of Signs

[0042] K Structure U Above-ground Structure L Underground Structure G Ground G1 Floor Attachment Surface 10 Preceding Floor 20 Retaining Wall 21 Core Material 25 Stud (Shear Transmission Member) 30 Pressure-resistant Disk Concrete (Foundation Structure) 31 Foundation Pile 40 Steel Frame Structure 41 Steel Column 42, 42’ Steel Beam 50 Outer Peripheral Beam 60 Joint 61 Main Reinforcing Bar 62 Stirrup (Shear Reinforcement Bar) 65 Peripheral Reinforcement Bar 66 Axial Reinforcement Bar 67 Surrounding Reinforcement Bar

Claims

1. In a construction method of a structure composed of a ground body and an underground body with a preceding floor as a boundary, a ground excavation step of providing a retaining wall having a core material and excavating the ground to the depth of the flooring surface; a foundation body construction step of constructing a foundation body on the flooring surface; an underground steel frame erection step of erecting a steel frame structure composed of columns and beams on the foundation body; at the top of the steel frame structure, constructing the preceding floor provided with an outer peripheral beam around the perimeter, and a preceding floor construction step of joining the retaining wall and the outer peripheral beam via a shear transmission member, including: By constructing the ground body using the preceding floor as a working platform, the construction work of the ground body and the underground body is carried out in parallel. In the outer peripheral beam, main reinforcement bars, shear reinforcement bars, and outer peripheral reinforcement bars for reinforcing around the shear transmission member are arranged. The outer peripheral reinforcement bars include axial reinforcement bars arranged parallel to the retaining wall, and surrounding reinforcement bars formed in a U-shape surrounding at least a part of the shear transmission member and the shear reinforcement bars. The surrounding reinforcement bars surround the shear transmission member and are arranged in a manner of holding and surrounding the vertical portion on the retaining wall side of the shear reinforcement bars and the upper and lower end portions connected to the vertical portion, so as to connect the shear reinforcement bars and the shear transmission member. A construction method of a structure, characterized by this.

2. An underground body constructed inside a retaining wall provided with a core material, and a ground body constructed on the upper part of the underground body via a preceding floor, in a structure in which the construction of the ground body and the underground body is carried out in parallel. At the joint between the preceding floor and the retaining wall, an outer peripheral beam is interposed in which main reinforcement bars, shear reinforcement bars, and outer peripheral reinforcement bars for reinforcing around the shear transmission member are arranged. At the joint between the retaining wall and the outer peripheral beam, the shear transmission member provided on the core material and the outer peripheral reinforcement bars are provided. The outer peripheral reinforcement bars include axial reinforcement bars arranged parallel to the retaining wall, and surrounding reinforcement bars formed in a U-shape surrounding at least a part of the shear transmission member and the shear reinforcement bars. The surrounding reinforcement bars surround the shear transmission member and are arranged in a manner of holding and surrounding the vertical portion on the retaining wall side of the shear reinforcement bars and the upper and lower end portions connected to the vertical portion, so as to connect the shear reinforcement bars and the shear transmission member. A structure, characterized by this.

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