JP6220659B2 - Position adjustment method of reaction force receiving member and top of column - Google Patents

Description

  The present invention relates to a position adjusting method for a reaction force receiving member and a top end of a prism.

  In the reverse placement method, after placing the floor / beam concrete on the first floor above ground, excavating underground, placing the floor / beam cocrete on the first basement floor, and then excavating in the order of the second basement floor and then the third basement floor. And floor / beam construction. Therefore, a structural column (steel column) is provided to receive the floor / beam load on the upper floor. In addition, the structural column built-in construction method is a construction method in which a steel column having an upper structure is inserted into a pile body of a cast-in-place pile and the pile and the upper column are constructed as an integral structure.

  Prior art documents 1 to 4 disclose a technique for correcting the position of a structural pillar with high accuracy when the structural pillar is built.

  Here, it is necessary to adjust the horizontal position of the top of the construction column so that the zero-section steel column and the first-stage beam steel frame can be accommodated as designed. Therefore, Non-Patent Document 1 states that when constructing the first floor slab (top slab), which is the standard floor for backlash construction, the area around the top of the construction pillar is thrown away and no box is placed without placing concrete. It is disclosed that discarded concrete is used as a reaction force of the jack.

  However, the method of using such temporary work floor concrete (abandoned concrete) as a reaction force receiver when adjusting the horizontal position of the top of the structural pillar is to place work floor concrete and dry the concrete. Until it is solidified, it is not possible to adjust the horizontal position of the top of the column.

  Accordingly, there is a demand for shortening the work period by performing the position adjustment of the top end of the structural pillar forward.

Japanese Patent Laid-Open No. 5-5312 JP-A-6-26204 JP-A-7-109733 JP-A-10-280408

Tsugaike Gumi Technology Research Report 2010 “Construction of high-rise office buildings by the back-striking method” pages 21-26

  In the present invention, it is an object to make it possible to carry out the adjustment of the position of the top end of the stem pillar forward.

The invention of claim 1 is embedded around the top end of the built-in column, and the inner peripheral surface of the hole formed in the center portion is a jack receiving surface, and the jack receiving surface, the top end, It is an annular reaction force receiving member made of concrete in which a jack is installed .

In the first aspect of the present invention, the annular reaction force receiving member made of concrete embedded around the top end of the stem column has a jack receiving surface on the inner peripheral surface of the hole formed in the central portion. Yes. And a jack is installed between this jack receiving surface and a top end, and it is used as a reaction force receiver of the jack at the time of position adjustment of the top end of the construction pillar after excavation. Therefore, after excavation, for example, it is not necessary to use a temporary work floor concrete as a reaction force receiver, so that the position adjustment of the top end of the structural pillar can be performed forward.

  The invention according to claim 2 is characterized in that an annular reaction force receiving member made of concrete having a jack receiving surface formed inside is installed around the top end of the built-up structural pillar to fill the structural pillar. A backfilling step, a drilling step of excavating the backfilled backfill material to expose the top end, and a jack provided between the top end and the jack receiving surface of the reaction force receiving member; And an adjustment process for adjusting the position of the end.

  In the invention according to claim 2, an annular reaction force receiving member made of concrete embedded around the top end of the stem column is used to adjust the position of the top of the stem column after excavation. Use as force receiver. Therefore, after excavation, for example, it is not necessary to construct a temporary work floor concrete to receive the reaction force, so that it is possible to carry out the adjustment of the position of the top end of the structural pillar forward.

  According to the present invention, the position adjustment of the top end of the true pillar can be carried out forward.

It is a perspective view of the state which is performing the position adjustment operation | work of the top end of a stem pillar using the reaction force receiving member of one Embodiment of this invention. It is a perspective view of the state where the upper steel column was joined after performing the position adjustment work of the top end of the stem column using the reaction force receiving member of FIG. It is a perspective view of the state which is producing the reaction force receiving member of FIG. It is process drawing which shows (A)-(C) of the process until it builds a construction pillar and refills. It is process drawing which shows (D)-(F) of the process until it builds a construction pillar and refills. It is process drawing which shows (G)-(H) of the process until it builds a construction pillar and refills.

  A reaction force receiving member according to an embodiment of the present invention and position adjustment of the top end of the true pillar using the reaction force receiving member will be described.

<Reaction force receiving member>
First, the reaction force receiving member 100 will be described.

  As shown in FIG. 1, the reaction force receiving member 100 is an annular block member having a substantially square outer shape in plan view and having a substantially regular hexagonal hole 102 formed in the center. A side surface (inner peripheral surface) of the hole 102 is a jack receiving surface 104 that receives a reaction force of the jack 200 described later.

  The reaction force receiving member 100 of the present embodiment is made of reinforced concrete (precast), and is manufactured by assembling a wooden formwork 150 on an iron plate 152 and placing concrete as shown in FIG. Yes.

  In addition, in the reaction force receiving member 100 of the present embodiment, reinforcing bars (not shown) including suspension hooks (bending reinforcing bars) 106 are arranged. The reinforcing bar may be a minimum reinforcing bar that has strength and rigidity required when the reaction force receiving member 100 is suspended during installation.

  The reaction force receiving member 100 only needs to have rigidity and strength capable of receiving the reaction force of the jack 200 as will be described later, and is finally disassembled. Therefore, high accuracy and quality are not required for the reaction force receiving member 100. Therefore, it can be produced by assembling the formwork 150 on the iron plate 152 and placing concrete. In addition, the remaining concrete can be used in another construction.

<Adjusting the position of the top of the structural stem>
Next, the horizontal position using the reaction force receiving member 100 at the top end 52 of the built-up column 50 for accommodating the zero-section steel column 60 (see FIG. 2) and the beam steel frame on the first floor as designed in the reverse driving method. The adjustment will be described.

  In the reverse placement method, after placing the floor / beam concrete on the first floor above ground, excavating underground, placing the floor / beam cocrete on the first floor underground, in order of the second floor underground and the third floor underground, Underground excavation and floor / beam construction. Therefore, a structural column (steel column) 20 is provided to receive the floor / beam load on the upper floor.

  4 (A) to 4 (H) are diagrams schematically showing the steps from setting up the true pillar to backfilling.

  As shown in FIG. 4A, the surface casing 12 is built and the pile hole 10 is excavated with an arc drill (not shown). Moreover, the lower end part of the pile hole 10 is expanded in diameter, and 10A of enlarged diameter parts are formed. In addition, slime treatment (bottoming) is performed by the slime cleaner 40.

As shown in FIG. 4 (B), the reinforcing bar 14 is suspended and built in the lower part of the pile hole 10 with a crane 42 (see also FIG. 4 (A)). As shown in FIG. 4 (C), the erection platform 20 for installing the construction pillar 50 (see FIG. 1) is installed on the pile hole 10.

  As shown in FIG. 4D and FIG. 4E, the built-up pillar 50 is built in the pile hole 10 while adjusting the position through the built-in mount 20. Moreover, the tremy pipe | tube 46 is built in the pile hole 10, and concrete C is laid in the lower end part of the pile hole 10 with the pump truck 44 (refer FIG.4 (D)). Then, during these operations, the same number of reaction force receiving members 100 as the structural pillars 50 are produced (see also FIG. 3). In addition, the concrete used for the reaction force receiving member 100 may be diverted from the concrete C placed at the lower end of the pile hole 10.

  As shown in FIG. 4F, the pile hole 10 is backfilled with a backfilling material M such as soil and land sand using a backhoe 48, and the erection platform 20 is removed with a crane 42. As shown in FIGS. 4G and 4H, the surface casing 12 is pulled out by the crane 42 (FIG. 4G) and removed (FIG. 4H).

  At this time, as shown in FIG. 4 (H), the reaction force receiving member 100 is disposed around the top end 52 of the stem 50 and backfilled together. In addition, the reaction force receiving member 100 is installed for each construction pillar 50 and backfilled together.

  Then, as shown in FIG. 1, when building the steel column 60 (see FIG. 2) of the upper floor portion, the backfill material M and the soil of the surrounding ground R (see also FIG. 4 (H)) are backfilled. Excavation is performed to dig out and expose the reaction force receiving member 100 and the top end 52 of the structural pillar 50.

  A jack 200 is installed between the top end 52 of the structural pillar 50 that has been dug and exposed and the jack receiving surface 104 that is the side surface of the hole 102 of the reaction force receiving member 100, and the jack 200 extends in the horizontal direction of the top end 52. Adjust the position.

  As shown in FIG. 2, the upper steel column 60 is welded to the top end 52 in a state where the top end 52 of the stem column 50 is adjusted in the horizontal direction by the jack 200.

  After that, when excavating for the construction of the underground floor, the reaction force receiving member 100 is disassembled by, for example, a weight dismantling machine that dismantles the existing underground enclosure.

<Action and effect>
Next, the operation and effect of this embodiment will be described.

  A concrete annular reaction force receiving member 100 embedded around the top end 52 of the structural pillar 50 is used as a reaction force receiver for the jack 200 in the position adjustment of the top end 52 of the structural pillar 50 after excavation. ing.

  Therefore, after excavation, for example, it is not necessary to construct a temporary work floor concrete to receive the reaction force, so that work efficiency is improved. Further, the position adjustment of the top end 52 of the structural pillar 50 can be performed forward (compared to the case where the reaction force receiving member 100 is not embedded around the top end 52 of the structural pillar 50). It is possible to carry out position adjustment ahead of schedule). Therefore, the ground work can be started at an early stage, so that the work period can be shortened.

<Others>
The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the reaction force receiving member 100 is an annular precast in which a substantially square outer shape is formed in a plan view and a substantially regular hexagonal hole 102 is formed in the center portion. Not. The outer shape and the hole may have any shape. Further, the reinforcing bars need not be arranged. In short, the reaction force receiving member only needs to have a jack receiving surface having rigidity and strength capable of receiving the reaction force of the jack inside.

  Moreover, in the said embodiment, although production of the reaction force receiving member 100 was started in the process of FIG.4 (D), it is not limited to this. The reaction force receiving member 100 only needs to be completed before it is backfilled in FIG. Further, the reaction force receiving member 100 may be manufactured in advance before the construction column 50 is built. Alternatively, the reaction force receiving member 100 may be produced and loaded not at the construction site but at another place, for example, a factory.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

50 Structural column 52 Top end 100 Reaction force receiving member 104 Jack receiving surface 200 Jack

Claims (2)

The inner peripheral surface of the hole formed in the center portion is buried around the top end of the built-up structural pillar, and the jack is installed between the jack receiving surface and the top end. reaction force receiving member of the concrete ring that. Around the top end of the built-up column, a concrete annular reaction force receiving member with a jack receiving surface formed inside is installed, and the backfilling step of backfilling the frame column
Excavating the backfill material, exposing the top edge, and
An adjustment step of adjusting the position of the top end by providing a jack between the top end and the jack receiving surface of the reaction force receiving member;
A construction method for adjusting the position of the true pillar.

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