JP2011252290A - Temporary steel column advance reverse placing construction method of underground skeleton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temporary steel column advance reverse placing construction method of an underground skeleton, capable of suppressing the deformation of an earth-retaining wall by utilizing a falling wall for an outer wall of the underground skeleton when an interval from a floor beam of a floor supporting the earth-retaining wall to an excavation bottom is large.SOLUTION: When constructing a temporary steel column B in advance in soil on the inner side of the earth-retaining wall A and successively constructing the underground skeleton from an upper floor to a lower floor while utilizing the permanent floor beam supported by the temporary steel column as an earth-retaining wall support, the falling wall 2 for the outer wall of the underground skeleton and the core material C of the earth-retaining wall are integrated by a stud connector 3, a reinforcing member of the falling wall for the outer wall is provided in the state of not being projected more than the inner side face S of an outer peripheral beam 1, and the soil is dug while preventing the deformation of the earth-retaining wall by the falling wall for the outer wall. The reinforcing member includes a vertical rib 4 to be a stud, a horizontal rib 12, and a steel material 13 to be embedded in the falling wall for the outer wall, etc.

Description

  In the present invention, a construction pillar is preliminarily constructed in the ground inside the retaining wall, and the underground floor is raised while using the main floor beam supported by the construction pillar as a retaining wall support. This is related to the improvement of the construction of the first-hand striking structure of the main pillar, which is constructed sequentially from floor to floor.

  As shown in Patent Document 1, when underground excavation for an underground floor is performed by using a built-in floor beam as a supporting work for a retaining wall in the construction of the first-hand struts of the underground pillar Even if the falling wall 2 for the outer wall of the underground frame and the core material C of the retaining wall A are integrated with the stud connector so as to exert the composite effect, it is rooted from the floor beam of the floor supporting the retaining wall A If the distance to the bottom is large, the retaining wall may be deformed by earth pressure.

  In such a case, conventionally, as shown in FIG. 14 and FIG. 15, the base column B is inclined from the position near the floor beam to the position near the root cutting bottom in the core material C of the retaining wall A exposed by excavation. A steel diagonal beam construction method that suppresses deformation of the retaining wall A by installing an oblique beam D made of H-shaped steel, or an outer peripheral beam 1 and a built-up column B of the underground frame as shown in FIGS. There is a concrete buttress construction method that constructs a temporary concrete buttress E that can support the core material C of the retaining wall A up to the position near the bottom and directly below the beam erected between them, and suppresses the deformation of the retaining wall A. It was adopted.

  However, since these conventional methods use temporary materials such as steel diagonal beams D and concrete buttress E, it is necessary to remove the temporary materials when the lower floor beams are in a state of supporting the retaining wall. There was a lot of work and cost for the temporary materials. In particular, in the steel oblique beam construction method, in order to fix the steel oblique beam D in an inclined state with respect to the structural column B, anchor bolts for fixing the beam are embedded in a part of the structural column B. It is necessary to provide a cut beam receiving seat F made of concrete, and the construction of the beam receiving seat F requires a lot of time and effort to secure the work.

Japanese Patent No. 3146396

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is for the outer wall of an underground frame when the distance from the floor beam of the floor supporting the retaining wall to the root cut bottom is large. The purpose of the present invention is to provide an upright reverse striking method for the underground frame that can suppress the deformation of the retaining wall using a falling wall.

  In order to achieve the above object, technical measures taken by the present invention are as follows. That is, according to the first aspect of the present invention, the first-stage reverse striking method for the underground structure of the underground frame is supported in advance by constructing the first pillar in advance in the ground inside the retaining wall. When constructing the underground frame from the upper floor to the lower floor in sequence while using the existing floor beam as a retaining wall support, the outer wall falling wall of the underground frame and the core of the retaining wall are integrated with the stud connector. In addition, the reinforcement member of the outer wall falling wall is provided so as not to protrude from the inner surface of the outer peripheral beam, and the ground is excavated while preventing the retaining wall from being deformed by the outer wall falling wall. It is characterized by that.

  The invention according to claim 2 is the construction of the first column reverse striking method of the underground structure according to claim 1, wherein the reinforcing member of the outer wall falling wall is connected to the inner side surface of the outer wall falling wall. It is characterized by vertical concrete ribs. The vertical ribs need only be provided in a shape that does not protrude from the inner side surface of the outer peripheral beam, and the required number is provided within the span (interval between the columns) of the outer peripheral beam, and may be configured as a main pillar. You may comprise as a buttress which does not require removal which exhibits the shape of a reverse thin triangle.

  The invention according to claim 3 is the construction column advance reverse striking method of the underground frame according to claim 1, wherein the reinforcing member of the outer wall falling wall is connected to the inner side surface of the outer wall falling wall. It is characterized by vertical ribs of concrete and horizontal ribs of concrete that connect them in the horizontal direction.

  The invention according to claim 4 is the steel column in which the reinforcing member of the outer wall falling wall is embedded in the outer wall falling wall, according to the first column reverse striking method of the underground frame according to claim 1 It is characterized by that.

  The invention according to claim 5 is the construction column advance reverse striking method of the underground frame according to claim 4, wherein the steel material is embedded so that the lower end of the steel material is located above the lower end surface of the outer wall falling wall. It is characterized by being.

  According to the first aspect of the present invention, the falling wall for the outer wall of the underground frame is integrated with the core material of the retaining wall by the stud connector, and the reinforcing member of the falling wall for the outer wall is formed from the inner side surface of the outer peripheral beam. Furthermore, the rigidity of the falling wall for the outer wall can be increased by providing it in a state where it does not protrude (in other words, it does not get in the way without being removed).

  Therefore, even if the space between the floor beam of the floor supporting the retaining wall and the root cut bottom is large, the falling wall for the outer wall of the underground frame is used without constructing temporary materials such as steel diagonal beams and concrete buttress As a result, deformation of the retaining wall can be suppressed, and it is not necessary to lay down the temporary material. Therefore, it is easy to reduce costs and ensure safety of work.

  According to the second aspect of the invention, the rigidity of the outer wall falling wall can be increased by appropriately setting the interval and the number of the vertical ribs continuously provided on the inner side surface of the outer wall falling wall. When constructing the falling wall for the outer wall with vertical ribs, when constructing the falling wall for the outer wall by concrete backlashing, change the shape of a part of the inner formwork for the falling wall to provide the necessary reinforcement reinforcement. All you need to do is easy to install.

  According to the invention described in claim 3, since the outer wall falling wall is reinforced by the vertical rib and the horizontal rib, the rigidity of the outer wall falling wall can be further enhanced easily.

  According to the fourth aspect of the present invention, the steel wall is embedded in the outer wall falling wall to reinforce the outer wall falling wall, so that the outer wall falling wall has a flat inner surface and the outer wall falling wall. The rigidity of the wall can be increased.

  According to the fifth aspect of the present invention, since the lower end of the steel material is embedded so as to be positioned above the lower end surface of the outer wall falling wall, the outer wall falling wall is constructed by backlashing concrete. At this time, it is not necessary to form an opening for penetrating steel in the bottom mold of the outer wall falling wall, and the construction is easy.

It is a longitudinal cross-sectional view which shows the construction pillar leading reverse driving method of the underground frame which concerns on this invention. It is a longitudinal cross-sectional view explaining the process following FIG. FIG. 3 is a longitudinal sectional view for explaining a process following the process in FIG. 2. FIG. 4 is a longitudinal sectional view for explaining a process following FIG. 3. It is a longitudinal cross-sectional view explaining the process following FIG. FIG. 6 is a longitudinal sectional view for explaining a process following FIG. 5. FIG. 7 is a longitudinal sectional view illustrating a process following the process in FIG. 6. It is a cross-sectional top view of the principal part. It is a longitudinal cross-sectional view of the principal part which shows other embodiment of this invention. It is a longitudinal cross-sectional view of the principal part which shows other embodiment of this invention. It is a cross-sectional top view of the principal part. It is a longitudinal cross-sectional view of the principal part which shows other embodiment of this invention. It is a cross-sectional top view of the principal part. It is a longitudinal cross-sectional view which shows a prior art example (steel diagonal beam construction method). It is a cross-sectional top view of the principal part of a prior art example. It is a longitudinal cross-sectional view which shows a prior art example (concrete buttress construction method). It is a cross-sectional top view of the principal part of a prior art example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an upright column structure reverse striking method for an underground frame according to the present invention will be described. First, as shown in FIG. 1, a soil cement column-type mountain retaining wall A is constructed, and a construction column B is preliminarily constructed in the ground inside the retaining wall A in this state. Then, the primary excavation of the ground is performed to the depth required for the construction of the outer wall falling wall described later. This excavation may be performed to the required depth only along the mountain retaining wall A as shown by the solid line in FIG. 1, and the center side may be shallow, and the whole is the same as shown by the phantom line a in FIG. You may drill to depth.

  After that, as shown in FIG. 2, the soil cement inside is removed, the core material C of the retaining wall A is exposed to the necessary depth, and the floor beam on the first floor supported by the construction pillar B is removed. Then, under the outer circumferential beam 1, a reinforced concrete outer wall falling wall 2 in the underground frame is constructed. The outer wall falling wall 2 and the core material C of the retaining wall A are structurally integrated by a stud connector 3 welded to the core material C. Further, the outer wall falling wall 2 has an outer wall falling wall 2 on the inner side. As shown in FIGS. 2 and 8, the concrete vertical rib 4 as the reinforcing member is continuously provided so as not to protrude from the inner surface S of the outer circumferential beam 1. The interval and the number of the vertical ribs 4 can be arbitrarily set according to the required degree of reinforcement. Reference numeral 5 denotes a permanent floor, and reference numeral 6 denotes a permanent beam constructed over the outer peripheral pillar 7 and the structural pillar B.

  Then, as shown in FIG. 3, after constructing the rising wall 8 for the outer wall on the upper part of the outer peripheral beam 1, the outer wall is used for ground excavation for the underground floor by using the floor beam on the first floor as a retaining wall support. The ground is excavated to a predetermined depth b while preventing the retaining wall A from being deformed by the falling wall 2.

  As shown in FIG. 4, after constructing a floor beam on the first basement floor supported by the structural pillar B and an outer wall falling wall 2 with vertical ribs 4 on the lower floor, as shown in FIG. As the support work for wall A, excavation of the ground will proceed. Although the lower end of the vertical rib 4 may be stopped at the lower end level of the outer wall falling wall 2, in the illustrated embodiment, the vertical rib 4 is installed in the state where the underground outer wall up to the first basement floor is completed. In order to use it as a stud, as shown in FIG. 5, the vertical rib 4 is provided in a continuous state up to the floor level of the first basement floor.

  Thereafter, when ground excavation up to the final excavation depth c is completed by repeating the same construction procedure as shown in FIG. 6, after constructing the pressure platen 9, the floor 10 on the lowest floor, the pit 11, etc., FIG. As shown in Fig. 2, the underground outer wall is completed by a forward construction method from the floor 10 upward.

  According to the above configuration, the outer wall falling wall 2 of the underground skeleton is integrated with the core material C of the retaining wall A by the stud connector 3, and the reinforcing member of the outer wall falling wall 2 is used as the inner wall of the outer peripheral beam 1. Falling wall for outer wall by providing it in a state where it does not protrude from the side surface (in the example shown, matches the inner surface of the outer peripheral column 7) S, in other words, it does not get in the way without being removed. 2 rigidity can be improved.

  Therefore, even if the distance from the floor beam of the floor supporting the retaining wall A to the root cut bottom is large, the falling wall 2 for the outer wall of the underground frame is not constructed without constructing temporary materials such as steel diagonal beams and concrete buttresses. Therefore, the deformation of the retaining wall A can be suppressed, and there is no need to mount the temporary material, so that the cost can be reduced and the safety of the work can be easily ensured.

  Also, when constructing the falling wall 2 for the outer wall with the vertical rib 4, it is necessary to change the shape of a part of the inner formwork for the falling wall when constructing the falling wall 2 for the outer wall by concrete backlashing. It is only necessary to perform reinforced reinforcement and construction is easy.

  FIG. 9 shows another embodiment of the present invention. In this embodiment, the vertical rib 4 of concrete as a reinforcing member for the outer wall falling wall 2 has an inverted triangular shape in which the upper end side coincides with the inner side surface S of the outer peripheral beam 1 and the lower end side becomes thinner in side view. It is characterized in that it is configured as a buttress that requires no removal. Since the vertical rib 4 is an inverted triangular buttress and the lower end side is narrower than the stud, the arrangement interval of the vertical ribs 4 is set to be narrower than the embodiment of FIGS. Other configurations and operations are the same as those in the embodiment of FIGS.

  10 and 11 show another embodiment of the present invention. In this embodiment, the reinforcing member of the outer wall falling wall 2 is made of concrete vertical ribs 4 (for example, studs) connected to the inner side surface of the outer wall falling wall 2 and the horizontal of the concrete connecting them in the horizontal direction. It is characterized in that it is constituted by a rib (for example, a vertically-raised main beam) 12.

  According to this configuration, since the outer wall falling wall 2 is reinforced by the vertical rib 4 and the horizontal rib 12, the rigidity of the outer wall falling wall 2 can be further enhanced. Other configurations and operations are the same as those in the embodiment of FIGS.

  12 and 13 show another embodiment of the present invention. This embodiment is characterized in that the reinforcing member of the outer wall falling wall 2 is constituted by a steel material 13 such as H-shaped steel embedded in the outer wall falling wall 2. The steel material 13 as the reinforcing member may be simply embedded in the concrete of the outer wall falling wall 2, but it is desirable in terms of construction to be welded and fixed to the core material C.

  According to this configuration, since the outer wall falling wall 2 is reinforced by embedding the steel material 13 in the outer wall falling wall 2, the outer wall falling wall 2 is flattened while the outer wall falling wall 2 is flat. 2 rigidity can be improved.

  The steel material 10 may have a length continuous from the outer circumferential beam 1 to the floor level. However, in the illustrated embodiment, the steel material 13 is made shorter than that, and the lower end of the steel material 13 is the falling edge for the outer wall. It is embedded so as to be located above the lower end surface of the wall 2. For this reason, when the outer wall falling wall 2 is constructed by concrete backlashing, it is not necessary to form an opening for penetrating the steel material in the bottom mold of the outer wall falling wall 2, and the construction is easy. Other configurations and operations are the same as those in the embodiment of FIGS.

In each of the above embodiments, the soil cement column array type retaining wall A is the target. However, in the underground pillar construction reverse striking method of the underground frame according to the present invention, the retaining wall A is a parent pile steel sheet pile type. It can also be applied to a mountain retaining wall.

A Mountain retaining wall B Frame column C Core material D Steel diagonal cut beam E Concrete buttress F Cut beam seat S Inner surface a Virtual line b Predetermined depth c Final excavation depth 1 Outer peripheral beam 2 Falling wall for outer wall 3 Stud connector 4 Vertical rib (reinforcement member)
5 Floor 6 Beam 7 Peripheral column 8 Rising wall for outer wall 9 Pressure-resistant panel 10 Bottom floor 11 Pit 12 Horizontal rib (reinforcement member)
13 Steel (Reinforcing member)

Claims (5)

  The construction column is pre-installed in the ground inside the retaining wall, and the main building floor beam supported by the construction column is used as a retaining wall support structure while the underground structure is used from the upper floor to the lower floor. In order to build up sequentially, the core material of the outer wall falling wall and the retaining wall of the underground frame is integrated with the stud connector, and the reinforcing member of the outer wall falling wall does not protrude beyond the inner surface of the outer peripheral beam An underground frame pre-spinning method for the underground structure, in which the ground is excavated while preventing deformation of the retaining wall at the falling wall for the outer wall.   2. The construction pillar pre-spinning method of the underground frame according to claim 1, wherein the reinforcing member of the outer wall falling wall is a concrete vertical rib continuously provided on the inner side surface of the outer wall falling wall.   The reinforcing member of the outer wall falling wall is a concrete vertical rib continuously provided on an inner surface of the outer wall falling wall and a concrete horizontal rib connecting them in the horizontal direction. The construction of the underground structure of the underground structure.   2. The construction pillar first reverse striking method of an underground frame according to claim 1, wherein the reinforcing member of the outer wall falling wall is a steel material embedded in the outer wall falling wall.   5. The construction pillar first reverse striking method of the underground frame according to claim 4, wherein the lower end of the steel material is embedded so as to be located above the lower end surface of the outer wall falling wall.

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