JPH11172710A - Method for constructing underground part of steel encased reinforced concrete building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify construction work for the underground part of a steel encased reinforced concrete building by enhancing the rigidity of an earth retaining frame. SOLUTION: During the process of excavating the ground, a wale 12 is mounted on the inside surface of an earth retaining wall 11, and a strut 13 is supported on the wale 12 to construct an earth retaining frame 1 preventing the collapse of the ground G2 . The wale 12 extends continuously along the earth retaining wall 11. Next, the foundation 2 of a building and an outer peripheral rising wall 3 rising from the outer periphery of the foundation 2 to a position below the wale 12 along the inside of the earth retaining wall 11 are constructed using reinforced concrete on the ground G1 excavated. After the strength of the reinforced concrete for the foundation 2 and the outer peripheral rising wall 3 manifest itself, the wale 12, the strut 13, and a rack pile 14 in the earth retaining frame 1 are dismantled and removed, and steel erection is performed whereby outer peripheral steel columns 4 serving as columns for the outer peripheral part of the building are vertically erected at predetermined intervals on the outer peripheral rising wall 3, while steel columns 5 serving as columns for the inside of the building are vertically erected at predetermined intervals on the foundation 2, with steel beams 6 extended at a predetermined height between the steel columns 4, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground part of a steel reinforced concrete building.

[0002]

2. Description of the Related Art In the construction of a steel-framed reinforced concrete building, when the basement is to be constructed, for example, as shown in FIG. A frame is applied.

[0003] In other words, in the prior art, when excavating the ground, the outer periphery (construction outer periphery of the underground portion of the building).
A mountain retaining wall 101 made of a sheet pile or the like is driven vertically along the ground, and the ground inside the mountain is excavated to a required depth. A cutting beam 103 is erected substantially vertically and horizontally on the belly 102, and a longitudinally intermediate portion thereof is attached to and supported by a shelf pile (not shown). The prow 102, the cutting beam 1
03 and the shelf pile are each made of a steel frame material such as an H-beam.

[0004] The cutting beams 103 in the mountain retaining structure are dismantled after the concrete of the foundation 104 and the outer peripheral rising wall 105 in the underground part of the building is cast. For this reason, after the pier is constructed by the pier 101, the bulge 102, the cutting beam 103, and the like, the base 104 and the outer rising wall 10 are formed.
When constructing 5, among the steel frame construction methods of the building, first, the construction work of the outer peripheral steel columns on the outer peripheral rising wall 105 is performed in advance, but in order to secure the connection of the steel columns, The hunger 102 is not assumed to be continuous in the horizontal direction,
The structure is cut off at the position where each steel column is erected.

[0005]

The following problems are pointed out in the above conventional method. (1) Of the steel frame construction methods for the building, since only the construction of the outer steel column on the outer rising wall 105 is performed in advance, it is difficult to ensure the construction accuracy of the construction of the outer steel column. Since the columns are constructed in the space where the cutting beams 103 are erected, the workability is poor and involves risks. (2) The construction of the steel frame of the building is the same as the construction of the outer steel column on the outer rising wall 105, the foundation 104 and the outer rising wall 10.
5 is performed separately from the construction of the steel frame inside the building after the construction, so that the construction procedure is complicated. (3) The belly 102 is not continuous in the horizontal direction,
Since the structure is cut off at the position where the outer peripheral steel column is erected, the rigidity of the pier is reduced, and the displacement of the outer ground 100 of the pier 101 is increased. (4) In order to form the structure in which the bulge 102 is cut at the position where the outer peripheral steel column is erected, a large number of short steel frames must be used as the bulge 102, and in order to prevent the rigidity from being reduced. The construction man-hours are large because the reinforcement of

The present invention has been made in view of the above circumstances, and a technical problem thereof is to increase the rigidity of a buckling frame structure in the construction of an underground portion of a steel-framed reinforced concrete building, and to improve the construction. Is to simplify.

[0007]

Means for Solving the Problems As a means for effectively solving the above-mentioned technical problems, a method for constructing an underground portion of a steel-framed reinforced concrete building according to the present invention comprises the steps of: After excavating the excavation and performing a retaining structure that supports the retaining wall with cutting beams through the belly,
On the foundation ground by the excavation excavation, a foundation of a building and an outer peripheral rising wall rising from the outer periphery of the foundation to the lower position of the girder along the inside of the retaining wall are constructed with reinforced concrete, and the strength of the reinforced concrete. After the occurrence of the above, the cutting beam is dismantled, and an outer peripheral steel column of the building is erected on the top of the outer peripheral rising wall to perform steel frame construction.
Therefore, in the building constructed in this manner, the foundation and the outer rising wall are made of reinforced concrete, and the upper part thereof is made of steel reinforced concrete.

According to the construction method of the present invention, since the outer peripheral rising wall of the underground portion of the building is constructed of reinforced concrete, the construction of the outer peripheral steel column is not performed when constructing the underground portion. Therefore, it is not necessary to make the bulging in the mountain retaining structure a shredded structure for embedding the outer steel column, and it can be continuous in the horizontal direction. After construction of the perimeter rising wall of the underground part, dismantle the beam in the mountain retaining structure, perform the steel frame construction for building construction,
At this time, support for the retaining wall is performed by the outer peripheral rising wall. After the disassembly of the cut beam, the outer steel column is built on the top of the outer rising wall, and this can be performed in parallel with the steel frame construction by other steel columns and steel beams in the building. .

In the present invention, more preferably, a number of protrusions are provided on the joint surface between the foundation and the outer peripheral rising wall of the retaining wall. The protrusion is typically made of a stud dowel or the like. In this way, the ridge wall is securely joined integrally with the concrete of the foundation and the outer peripheral rising wall, and a strong ridge structure that integrally supports the displacement force of the surrounding ground and the outer peripheral rising wall. Becomes

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show a preferred embodiment of a method for constructing an underground portion of a steel reinforced concrete building according to the present invention in the order of steps. First, in the excavation excavation and mountain retaining frame process shown in FIG. 1, a mountain retaining wall 11 made of, for example, a sheet pile is driven vertically along a construction outer periphery of an underground portion of a building, and an inner ground G ₁ is excavated. Go.

In the excavation process, the retaining wall 11
The belly 12 is mounted horizontally on the inner surface of the
2 is mounted substantially vertically and horizontally with respect to 2, and the longitudinal middle thereof is mounted and supported on a shelf pile 14 to prevent collapse of the ground G ₂ outside the retaining wall 11. Build 1. Then, as shown in FIG. 2, completing the root switching by digging up and then further inside of the ground G ₁ a predetermined depth mountain Tomekabe 11.

The bulge 12 is made of a steel material such as H-shaped steel which continuously extends in a direction perpendicular to the cross section shown in the figure with respect to the retaining wall 11. Made of wood. For this reason, the number of construction steps is reduced as compared with the conventional construction method in which the bulge is cut at the position where each steel column is erected. Moreover, since the rigidity of YamaTome Frame 1 by wale 12 consecutive increases, the outside of the ground G ₂ of YamaTomekabe 11, for example, railroad track in a direction perpendicular to the illustrated cross section (not shown) is laid even when an such that the track bed soil, the supporting force against the displacement of the ground G ₂ due to vibration or the like caused by the passage of the vehicle on the track is improved.

Next, as shown in FIG. 3, on the ground G ₁ excavated and excavated, a ground 2 is formed along the inside of the retaining wall 11 from the outer periphery of the foundation 2 and the outer periphery of the foundation 2. Raising 12
The outer peripheral rising wall 3 that rises to the lower position is constructed of reinforced concrete. At the time of construction, work such as assembling a formwork and arranging reinforcing bars (not shown) is performed, and concrete is poured into the formwork. Also, the foundation 2 on the retaining wall 11
A large number of stud dowels 15 are previously provided at predetermined intervals in a range to be joined to the outer peripheral rising wall 3 by driving or screwing. For this reason, the concrete of the foundation 2 and the outer peripheral rising wall 3 is integrated with the retaining wall 11 via the stud dowels 15 as the concrete is hardened after the casting, and is in a strong joint state.

When the strength of the reinforced concrete of the foundation 2 and the outer peripheral rising wall 3 has developed, the pier 1 is installed as shown in FIG.
The belly 12, the cutting beam 13 and the shelf pile 14 are dismantled and removed. After removal of the cutting beam 13, the retaining wall 11 is supported by the outer peripheral rising wall 3 and the foundation 2 integrated with the retaining wall 11.

Next, on the top 3a of the outer peripheral rising wall 3, an outer peripheral steel column 4 which is a column of the outer peripheral portion of the building is vertically erected at a predetermined interval, and a steel frame which becomes a column of the inner portion of the building is formed on the foundation 2. Pillars 5 are erected vertically at predetermined intervals, and these steel
A steel frame is constructed such that a steel beam 6 is vertically and horizontally erected at a predetermined height. That is, the lower end of the column base of the outer steel column 4 is higher than the lower end of the column base of the other steel columns 5.

According to this construction method, the outer peripheral steel columns 4 serving as pillars at the outer peripheral portion of the building are built in parallel with the steel columns 5 and the steel beams 6 serving as pillars inside the building. ,
The construction accuracy can be improved as compared with the conventional construction method in which the construction of the outer steel column 4 precedes the construction of another steel frame.

After the steel frame is constructed, the skeleton is constructed in the same process as in the prior art. Therefore, in the building constructed by the method of this embodiment, the foundation 2 and the outer peripheral rising wall 3 are made of reinforced concrete (RC), and the skeleton thereon is made of steel reinforced concrete (SRC).

[0018]

According to the present invention, the following effects are realized. (1) Workability and safety are improved because the steel frame construction work is performed after dismantling and removing the girder. (2) The construction of the outer steel columns can be performed in parallel with the construction of other steel columns and steel beams, and the workability of the steel frame construction is improved as described above. Can be improved. (3) The rigidity of the buckling frame is improved because it is not necessary to employ a structure in which the bulge is cut off at the position where the outer steel column is erected. (4) Since there is no need to precede the construction of the outer steel columns with the construction of other steel columns, the construction procedure is simplified, the number of construction steps is reduced, and the construction period is shortened.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a root excavation and a pier construction process in a preferred embodiment of a construction method of the present invention.

FIG. 2 is an explanatory diagram showing a root excavation completion state in the embodiment.

FIG. 3 is an explanatory view showing a construction process of a foundation and an outer rising wall of an underground portion of a steel reinforced concrete building in the embodiment.

FIG. 4 is an explanatory diagram showing a steel frame building process of the steel frame reinforced concrete building in the embodiment.

FIG. 5 is an explanatory view showing a construction method according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 mountain retaining frame 11 mountain retaining wall 12 bulging 13 cutting beam 15 stud dowel 2 foundation 3 outer rising wall 4 outer steel column

Claims (2)

[Claims] 1. A step of excavating the inside of a retaining wall driven into the ground, and performing a retaining structure supporting the retaining wall with a cutting beam via a flank, and a foundation by the excavation. A step of constructing a foundation of the building on the ground and an outer peripheral rising wall rising from the outer periphery of the foundation to the lower position of the girder along the inside of the retaining wall with reinforced concrete, after the strength of the reinforced concrete is developed Dismantling the girder at the top of the perimeter rising wall, erection of the steel frame by erection of the outer peripheral steel columns of the building, comprising: Construction method. 2. The method according to claim 1, wherein a number of protrusions are provided on the joint surface between the foundation of the retaining wall and the outer peripheral rising wall.