JP2008156930A - Base-isolating and repairing method for existing building having earthen floor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolating and repairing method which is applicable to base isolation work of a foundation lower portion of an existing building having an earthen floor or an earthen floor slab, wherein the method is carried out with good efficiency by precedently reinforcing the earthen floor in advance, and then excavating an area under the earthen floor without bearing the earthen floor by supports. <P>SOLUTION: According to the method, the earthen floor slab of the existing building is strengthened beforehand, and then the ground under the earthen floor is excavated without setting the supports under the earthen floor. Then a pressure bottom slab and a retaining wall are constructed in the excavated place to form a base isolation layer, and then base isolation devices are set in the foundation portion of the existing building, to thereby achieve base isolation of the existing building. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, an existing building having a dirt floor or a dirt slab (hereinafter simply referred to as a dirt floor), that is, a base that does not have a basement floor, such as a factory or a building, is subjected to seismic isolation in advance. It belongs to the technical field of seismic isolation renovation method that excavates the soil basement without supporting the soil with the support from below and efficiently constructs it.

Conventionally, when performing seismic isolation repair of an existing building having a soil, as illustrated in FIGS. 8 to 10, first, a heavy machine 3 is used for the soil slab 2 of the existing building 1. Dismantle and remove (Figure 8). Thus, the excavating heavy machines 4 and 4 ′ are operated through the opening formed in the dirt slab mark, and the excavation of the underground ground of the existing building is advanced to the depth required for the seismic isolation repair work (FIG. 9). Reference numeral 5 in the figure indicates a foundation beam under the soil slab, and 6 indicates a retaining wall.
Thus, when the pile head of the foundation pile 7 is exposed below the foundation of the existing building, the pressure-resistant bottom plate 8 is constructed on the bottom of the excavation, and further the seismic isolation layer retaining wall 9 is constructed. Form a seismic layer. Then, the structural slab 10 is constructed again, and then, as is well known and known as a seismic isolation repair method, after the load repositioning measure for the pile head of the foundation pile 7 is taken, the pile head is cut, The purpose of the seismic isolation repair is achieved by the procedure of setting the seismic isolation device 11 at the cut location (FIG. 10).

  According to the conventional seismic isolation repair method described above, the steps of dismantling the floor and reconstructing the structural slab 10 are taken, which is inefficient and time consuming. Moreover, dismantling and removal of the dirt floor generates a large amount of waste, which is expensive to dispose of and results in problems for environmental conservation. Furthermore, after dismantling the floor of the existing building 1, the first floor part of the existing building is unusable until it is rebuilt. There is no inconvenience in construction.

Therefore, for the purpose of realizing a seismic isolation repair method that does not require dismantling of the floors of existing buildings, for example, the invention disclosed in the following Patent Document 1 “Underground seismic isolation method for existing buildings” Advance the excavation of the underground ground with support from the bottom in advance, and after excavation, reinforce the soil concrete floor with foundation beams, and further inject concrete to reinforce, and press-fit the bottom plate reinforcement piles After that, it is described that the floor base board will be dug down, the bottom board will be newly installed at the bottom of the excavation, and then the existing piles under the foundation will be cut and the seismic isolation device installed.
In addition, the invention “Seismic isolation method for existing buildings” disclosed in Patent Document 2 is to support an existing concrete floor from below with a joist and a pillar when renovating an existing building with soil concrete. Use the excavated work space to reinforce the structure by constructing a reinforcing structure on the underside of the concrete floor, and then proceed to excavate under the foundation to install the seismic isolation device and support the existing building for seismic isolation The procedure to do is described.

Japanese Patent No. 3706997 JP 2006-2428 A

  In the prior art disclosed in Patent Documents 1 and 2 described above, the seismic isolation repair method for an existing building having a dirt floor is to leave the existing dirt floor as it is and proceed with the seismic isolation repair work. However, these prior arts not only reinforce the interstitial floor with various methods and processes but also use a support that supports the interstitial floor from below as a means and preparatory work for leaving the existing interstitial floor as it is. This is a necessary condition. For this reason, it is difficult to install large heavy machinery for excavation of the soil basement, and the extent to which support can be done is limited to performing hand-digging work or using a small excavator at best. There was no choice but to perform work with poor work efficiency.

  Therefore, the object of the present invention is to perform the reinforcement work of the interstitial floor in advance in a simple manner with a minimum amount of effort in a short time, and without supporting the interstitial slab with the support from below, Providing a seismic isolation repair method for existing buildings with a gap between drilling and other work using large equipment as large as possible efficiently and in a short time to reduce construction costs and shorten the construction period It is to be.

As means for solving the above-mentioned problems of the prior art, the seismic isolation repair method for an existing building having a soil according to the invention described in claim 1 is:
In the seismic isolation renovation method that excavates the soil basement of an existing building with a gap to form a seismic isolation layer, and the existing building is isolated.
The slab 2 of the existing building 1 is strengthened in advance, the excavation of the basement floor is carried out without installing supports under the soil, and the pressure-resistant bottom plate 8 and the retaining wall 9 are built at the same excavation site to make a seismic isolation. It is characterized by forming a layer and installing the seismic isolation device 11 on the foundation part of the existing building 1 for seismic isolation.

The invention described in claim 2 is the seismic isolation repair method for an existing building having a gap between
The process of installing the seismic isolation device 11 on the foundation part of the existing building 1 and making it seismic isolation is the process of cutting the pile head of the foundation pile 7 and installing the seismic isolation device 11 at the cut location, or under the soil. It is characterized by performing the process of cutting the exposed building pillar 25 and installing the seismic isolation device 11 at the cut location.

The invention described in claim 3 is the seismic isolation repair method for an existing building having a gap between
The embedding slab 2 is strengthened in advance by constructing the embedded anchor 10 in advance in the soil slab 2 of the existing building 1 and increasing the number of the structural slabs 11 to form an integrated structure.

The invention described in claim 4 is the seismic isolation repair method for an existing building having a gap between
The embedding slab 2 is strengthened in advance by constructing an embedded anchor 10 in advance in the soil slab 2 of the existing building 1 and installing a temporary steel beam 12 to form an integrated structure.

The invention described in claim 5 is the seismic isolation repair method for an existing building having a gap as described in claim 1,
The lower part of the suspension material 14 connected to the upper frame of the existing building 1 is fastened to and suspended from the soil slab 2 of the existing building 1, and the soil slab 2 is supported and strengthened in advance. And

The invention described in claim 6 is the seismic isolation repair method for an existing building having a soil space described in claim 1,
The soil slab 2 of the existing building 1 is dismantled and a new structural slab 15 is constructed in advance at the same place.

  According to the seismic isolation repair method of the inventions according to claims 1 to 6, the reinforcement work of the soil slab 2 is easily performed in a short time with a minimum of effort in advance. Without supporting the soil slab 2 with support from below, excavation and other work of the soil ground slab can be carried out as mechanized construction using the largest heavy machinery 4 and 4 'as efficiently as possible. Since construction can be carried out in a short time, the construction cost can be reduced and the construction period can be shortened. Since the seismic slab 2 is left as it is and the seismic isolation work is carried out, there is no hindrance to the use of the first floor and upper floor of the existing building, and it is possible to use the existing building 1 during the construction period. Work can be done “while you are”.

Moreover, since the seismic isolation repair method of the invention which concerns on Claims 1-5 leaves the soil slab 2 of the existing building 1 as it is, and does not perform dismantling and removal, it can reduce the amount of generated waste, and again It does not require time and effort to build a dirt floor.
In the case of the seismic isolation repair method of the invention according to claim 6, once the soil slab 2 of the existing building 1 is dismantled and removed, but immediately after that, a structural slab 15 having high strength is built in the same place in advance. Construction of the slab 15 does not require temporary support or the like, and can be easily and quickly constructed. After that, excavation and other work of the soil groundwork is carried out without support with support from below, so that construction can be carried out with as little effort and time as possible.

Excavation of the ground floor of the existing building 1 with a gap to form a seismic isolation layer, and in order to make the existing building seismic isolation, strengthening the soil slab 2 of the existing building 1 in advance and supporting it under the soil Excavation of the ground floor without installing any kind, building a pressure-resistant bottom plate 8 and retaining wall 9 at the excavation site to form a seismic isolation layer, and installing a seismic isolation device 11 on the foundation of the existing building 1 This is a seismic isolation renovation method. The process of installing the seismic isolation device 11 on the foundation portion of the existing building 1 to make the base isolation is the process of cutting the pile head of the foundation pile 7 and installing the seismic isolation device 11 at the cut location, or under the soil This is performed by cutting the pillar 25 of the building exposed in the step and installing the seismic isolation device 11 at the cut portion.
The means or reinforcement work for strengthening the soil slab 2 of the existing building 1 in advance is performed by constructing the embedded anchor 10 in advance on the soil slab 2 of the existing building 1 and increasing the number of structural slabs 11 and integrating with the soil slab 2. A method of strengthening the soil slab 2 in advance by making the structure,
Alternatively, a method of strengthening the soil slab 2 in advance by constructing the embedded anchor 10 in the soil slab 2 of the existing building 1 and installing a temporary steel beam 12 and making it an integrated structure with the soil slab 2;
Alternatively, a method in which the lower part of the suspension member 14 connected to the upper frame of the existing building 1 is fastened to the soil slab 2 and suspended on the soil slab 2 of the existing building 1 to support and strengthen the soil slab 2 in advance.
Alternatively, a method of dismantling the soil slab 2 of the existing building 1 and constructing the structural slab 15 in advance at the same place is performed.

Next, the present invention will be described based on the illustrated embodiment.
The present invention is a seismic isolation repair method for excavating a soil base layer of an existing building 1 having a soil to form a base isolation layer and making the existing building 1 base isolation. As shown, the slab 2 of the existing building 1 is reinforced in advance and left as it is. Then, without installing a support under the soil, excavation of the soil ground board is performed as efficiently as possible using the heavy machinery 4 and 4 'as large as possible (Fig. 1). Building a pressure-resistant bottom plate 8 and retaining wall 9 in the place to form a seismic isolation layer, and installing a seismic isolation device 11 on the foundation part of the existing building 1 (in the case of this example, the pile head of the foundation pile 7) It is characterized by achieving the purpose of seismic isolation repair (Figure 2).
Therefore, the final form that has achieved the purpose of the seismic isolation repair does not change as is obvious by comparing FIG. 2 and FIG. However, the process status at the stage of excavating the soil foundation board, which is the previous process, is greatly different depending on the presence or absence of the soil slab 2 of the existing building 1 as is apparent from the comparison between FIG. 1 and FIG. That is, when the seismic isolation repair work for the existing building 1 is carried out with the soil slab 2 of the existing building 1 left as in the seismic isolation repair method of the present invention, not only the first floor part of the existing building 1 but also the upper floor Since it can be used continuously up to the part, so-called (in-service) construction is achieved.
Of course, in the case of the inventions of claims 1 to 5, it is possible to avoid the trouble of once dismantling and removing the soil slab 2 of the existing building 1 and finally building the soil again, and dismantling and removing the soil slab 2 The inconvenience of increasing the amount of waste caused by doing so can also be avoided.

Now, as means for realizing the above-mentioned seismic isolation repair method of the present invention, means or a construction method for strengthening the soil slab 2 of the existing building 1 in advance will be described below.
First, in FIG. 3, a plurality of embedded anchors 10 are preliminarily installed vertically on the soil slab 2 of the existing building 1, and a reinforced concrete structure slab 11 is newly added to the embedded anchor 10. By joining the soil slab 2 with an integrated structure, a method of strengthening the soil slab 2 sufficiently in advance, that is, to the extent that it is not necessary to support it from below with supports when excavating the soil foundation board, Show. The soil slab 2 is also reinforced by installing an anchor 10 between the column base.
Next, FIGS. 4A and 4B show that the embedded anchor 10 is also applied to the soil slab 2 of the existing building 1 vertically upward, and a plurality of temporary steel beams 12 are left and right as shown in FIG. Are installed in an arrangement to be supported over the foundation beams 13 and 13 and are joined to the soil slab 2 using the embedded anchor 10 to form an integrated structure, so that the soil slab 2 is necessary and sufficient in advance. Shows how to strengthen. Of course, the temporary steel beam 12 is removed after the seismic isolation work is completed, and the upper surface of the soil slab 2 is opened.

  Next, FIG. 5 shows a suspension member 14 such as a PC steel rod to the left and right inner corners of the upper frame of the existing building 1, in the illustrated example, the second-column column beam frame formed by the columns 1 a and 1 b. Connect the top ends of the. The embedded anchor 10 is installed in advance at two central positions obtained by dividing the foundation beam span of the soil slab 2 into approximately three equal parts, and the lower end portion of the suspension member 14 is fixed using the embedded anchor 10. . Then, a turn buckle or other tension means (not shown) introduces an appropriate initial tension to the suspension member 14 to suspend the soil slab 2 and strengthens it to the extent that it can prevent collapse due to falling in advance.

Further, FIGS. 6A and 6B are slightly different in concept from the above-described reinforcing construction means, and the soil slab 2 of the existing building 1 is once dismantled in advance. Immediately thereafter, a strengthening method is shown in which a structural slab 15 made of high-strength reinforced concrete or the like is newly constructed in the same place and replaced with the existing soil slab 2.
In this method, the soil slab 2 of the existing building 1 is dismantled once, but a high-strength structural slab 15 is newly constructed at the same location in advance, that is, before starting the excavation work of the soil foundation board. Therefore, the ground of the dismantling slab can be used as a slab formwork, and no support is required to support the slab formwork. Since the new structural slab 15 can be constructed to the required slab thickness in consideration of the design load and design conditions, when the structural slab 11 is struck over the soil slab 2 as in the method of FIG. In comparison, the total slab thickness can be reduced, and there is no inconvenience that the ceiling height of the first floor portion is reduced. Further, as in the method of FIGS. 4 and 5, the temporary steel frame 12 is exposed on the soil slab 2 during the period of the seismic isolation renovation work, or the suspension member 14 is exposed to cause trouble in use of the first floor portion. There is no inconvenience.

Next, FIGS. 7A to 7D show an exemption performed by cutting the pillar 25 of the building exposed under the soil as a process of installing a seismic isolation device in the base portion of the existing building 1 having the soil slab 2 and making it seismic isolation. An example of the earthquake repair method is shown. Reference numeral 21 denotes a foundation beam.
FIG. 7A shows an example of an existing building 1 ′ in which a pillar 25 is supported by a direct foundation 16. FIG. 7B shows a stage in which the soil slab 2 is reinforced by any of the reinforced construction means or construction methods shown in FIGS. Reference numeral 20 represents a reinforced slab.
FIG. 7C shows a stage where excavation of the soil ground board is performed using the large heavy machinery 4 and 4 ′, and the pillar 25 of the building is exposed under the soil.
FIG. 7D shows that the pressure-resistant bottom plate 8 is constructed on the bottom of the excavation, the retaining wall 9 is further constructed to form a seismic isolation layer, and then the building pillar 25 exposed under the soil is cut, and the seismic isolation is provided at the cut location. The stage which installed the apparatus 11 and completed seismic isolation repair is shown. Reference numeral 22 indicates a strengthening base of the seismic isolation device 11.

  Although the present invention has been described based on the illustrated embodiment, of course, the technical idea of the present invention is not limited to the above embodiment. It should be noted that the present invention can be implemented in a variety of ways, including design changes and application modifications usually made by those skilled in the art, without departing from the spirit and technical idea of the present invention.

It is sectional drawing which shows the condition of the underground excavation process in the seismic isolation repair method of this invention. It is an elevational view showing the completed state of the seismic isolation repair work. It is sectional drawing which shows the reinforcement | strengthening construction method of the soil slab by additional striking of a structural slab. A and B are a sectional view and a plan view showing a method for strengthening a soil slab with a temporary steel beam. It is sectional drawing which shows the reinforcement construction method of the soil slab by a hanging material. A and B are sectional views showing a reinforced construction method for replacing a soil slab with a structural slab. AD shows the important process drawing of the construction method which exposes the pillar of the existing building under the soil and makes it seismic isolation. It is sectional drawing which shows the dismantling process of the soil slab by a conventional construction method. It is sectional drawing which showed the excavation process under the soil by the conventional construction method. It is an elevational view showing the completed state of the seismic isolation repair work by the conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing building 2 Drum slab 8 Pressure-resistant bottom board 9 Retaining wall 11 Seismic isolation device 10 Embedded anchor 11 Structural slab 12 Temporary steel beam 14 Suspension material 1 Structural slab 25 Building pillar

Claims (6)

In the seismic isolation renovation method that excavates the soil basement of an existing building with a gap to form a seismic isolation layer, and the existing building is isolated.
Excavating the soil slab of the existing building in advance and excavating the soil base without installing supports, forming a pressure-resistant bottom plate and retaining wall at the excavation site to form a seismic isolation layer, Seismic isolation repair method for existing buildings with soil, characterized in that seismic isolation devices are installed in the foundation of existing buildings.   The process of installing a seismic isolation device on the foundation part of an existing building and making it seismic isolation is the process of cutting the pile head of the foundation pile and installing the seismic isolation device at the cut location, or the building exposed under the soil. The method for seismic isolation repair of an existing building having a gap according to claim 1, wherein the method is performed by cutting a column and installing a seismic isolation device at the cut location.   The interstitial slab is strengthened in advance by constructing an embedded anchor on the interstitial slab of an existing building to increase the structural slab and making it an integrated structure with the interstitial slab. Seismic isolation repair method for existing buildings.   The earthen slab according to claim 1, wherein the earthen slab is strengthened in advance by constructing an embedded anchor on the earthen slab of an existing building and installing a temporary steel beam to form an integrated structure with the earthen slab. Seismic isolation repair method for existing buildings.   The lower part of the suspension material, the upper part of which is connected to the upper frame of the existing building, is secured to the soil slab and suspended from the soil slab, and the soil slab is supported and strengthened in advance. Seismic isolation repair method for existing buildings with earthen spaces.   The seismic isolation repair method for an existing building having a soil according to claim 1, wherein the soil slab of the existing building is dismantled and a new structural slab is constructed in advance at the same location.

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