JP2013231329A - Building subsidence correction construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building subsidence correction construction method capable of correcting a building suffering from unequal subsidence in a stable state by imposing a lift-up force by using a chemical solution on a foundation from below in a state in which the lift-up force is dispersed over a wide range.SOLUTION: A building subsidence correction construction method for correcting an unequal subsidence generated in a building 10 by using a grout-based chemical solution includes: a step of cutting and separating the lower surface of a foundation 11 of the building 10 from a foundation ground 12 immediately under the lower surface; and a step of injecting the grout-based chemical solution having a high flowability into the foundation ground 12 immediately under the separated lower surface of the foundation of the building 10 through a plurality of injection pipes 13 penetrating through the foundation 11 of the building 10 and installed, to send the grout-based chemical solution under pressure in a lateral direction along the lower surface of the foundation 11 of the building 10. The building subsidence correction construction method includes also a step of repeating the step of injecting the grout-based chemical solution having a high flowability, a plurality of times, at time intervals to form a lamination bed 14 in which a plurality of solidification layers 14a of the grout-based chemical solution are laminated.

Description

  The present invention relates to a building subsidence correction method for correcting uneven subsidence occurring in a building by using an injection solidifying material.

  For example, if the ground that constitutes back swamps, coastal landfills, delta lowlands, drowned valleys, coastal sandbars, etc. is formed from peat-like ground or ground with slow consolidation, etc., it is a soft ground There are many. Such soft ground has a small ground supporting force and is likely to continue to be consolidated. Therefore, when building a building above the soft ground, the subsidence (unequal settlement), etc. Settlement is likely to occur.

  When there is uneven settlement in the building, as a method of correcting this, for example, by correcting the sinked part of the building by using a jack device etc. together with the foundation, it can be applied to the ground below the foundation of the building. A method of injecting and correcting a grout chemical solution has also been proposed (see, for example, Patent Document 1 and Patent Document 2).

  In the restoration method for unequal subsidence structures in Patent Document 1 and Patent Document 2, a plurality of chemical liquid injection rods (injection pipes) are installed at a required interval so that the tip discharge part is located below the foundation of the target structure. With these chemical injection rods, instantaneously or moderately liquid chemicals are press-fitted while sequentially switching to a plurality of chemical injection locations at a required interval, and the ground is reinforced by being injected first at each chemical injection location. By repeatedly pressing the chemical solution into the reinforcing layer and the homogel portion of the chemical solution in a split state, the reaction force is gradually increased in each ground reinforcement layer portion, so that the structure is lifted together with the base portion to be restored to the normal state. It has become.

JP-A-8-260500 JP-A-8-296248

  However, the restoration method for unequal subsidence structures in Patent Literature 1 and Patent Literature 2 is a construction method mainly used for large-weight structures (multi-storey buildings) with a wide foundation. For example, if it is adopted for a small-scale building such as a residential building to correct the uneven settlement, the uneven settlement may be increased.

  In other words, the chemical solution injected into the foundation ground below the foundation of the building is easy to flow from the injection point to the direction where the restraining pressure around it is reduced by the injection pressure. In the case of a building, it is injected because the restraint pressure of the foundation ground is considered to be lower in the relatively high part than in the part where the foundation sinks and is relatively low. In some cases, the inclination of the building is further increased by flowing the chemical solution out toward the relatively high portion and pushing it up so as to rotate the foundation in the opposite direction.

  Also, especially when the foundation of the building is a solid foundation or a moisture-proof foundation, these foundations are not so large in bending strength against loads from below in the flat plate-like foundation slab part between the rising parts. If the lift-up force from below is locally applied at the location where the chemical solution is injected, the foundation slab portion may be damaged.

  The present invention can effectively avoid an increase in the uneven settlement, and the lift-up force by the chemical solution is loaded in a state of being widely distributed from below the foundation to correct the uneven settlement of the building in a stable state. The purpose is to provide a subsidence correction method for buildings.

  The present invention relates to a building subsidence correction method for correcting a non-uniform subsidence occurring in a building using a grout chemical solution, a process of cutting the bottom surface of the foundation of the building by cutting the edge from the foundation ground of the immediately lower part, By injecting a highly fluid grouting chemical into the foundation ground directly under the ground through a plurality of injection pipes installed through the foundation of the building, in the lateral direction along the bottom surface of the foundation of the building A step of pumping the grouting chemical solution, and injecting the grouting chemical solution with high fluidity a plurality of times at intervals, thereby fixing the grouting chemical solution below the foundation of the building. The object is achieved by providing a building subsidence correction method including a step of forming a laminated bed in which a plurality of laminated layers are laminated.

  Then, according to the building settlement settlement method of the present invention, after the step of forming the laminated bed, the instantaneous grouting chemical is applied to the lower side of the laminated bed through the injection pipe with a time interval. In addition, it is preferable to provide a step of forming the injection solidified body by repeatedly injecting a plurality of times and lifting up the foundation of the building together with the laminated bed using the injected solidified body as a reaction force receiver.

  Further, according to the building settlement correction method of the present invention, after the step of forming the laminated bed, a grout system having a quick setting between the lower surface of the foundation of the building and the laminated bed via the injection pipe. It is preferable to provide a step of lifting the foundation of the building by injecting a chemical solution with the stacked bed as a reaction force receiver.

  Furthermore, according to the subsidence correction method for a building of the present invention, the foundation of the building is preferably a solid foundation or a moisture-proof foundation.

  Furthermore, according to the subsidence correction method for a building of the present invention, the step of grounding the lower surface of the foundation of the building by cutting the edge from the foundation ground of the immediately lower portion includes the lower surface of the foundation and the surface layer of the foundation ground. A gap is formed between the part and a pressure expansion body that expands and deforms when a fluid pressure is applied to the gap from a flat cross-sectional shape is inserted into the gap, and the fluid is pumped to the pressure expansion body. It is preferable that the base of the building is lifted by expanding and deforming.

  According to the subsidence correction method of the building of the present invention, it is possible to effectively avoid an increase in the uneven subsidence, and to load in a state in which the lift-up force due to the chemical solution is dispersed in a wide range from the bottom of the foundation, a stable state You can correct the uneven settlement of the building.

(A)-(c) is a schematic sectional drawing explaining the process of the subsidence correction method of the building which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining the other process of the subsidence correction method of the building which concerns on preferable one Embodiment of this invention. It is a schematic top view of the foundation of a building explaining the arrangement position of an injection pipe and a pressurization expansion object. (A), (b) is a schematic sectional drawing explaining the condition which lifts the foundation of a building by expanding and deforming a pressurization expansion body.

  The building subsidence correction method according to a preferred embodiment of the present invention shown in FIGS. 1 (a) to 1 (c) is, for example, a small scale constructed on a landfill created by embankment above a soft ground. As a building, for example, when a residential building 10 has been subsidized for several months to several decades after construction, for example, the sinking part of the residential building 10 is pushed up so that the inclination of the residential building 10 is increased. It was adopted as a construction method for correcting using grout chemicals. 1-4, only the part of the foundation 11 which abbreviate | omitted the housing | casing part is shown as a principal part of the residential building 10 by which subsidence is corrected by this embodiment.

  And the subsidence correction method of the building of this embodiment is the subsidence correction method which corrects the non-uniform subsidence which arises in the building 10 using a grout type chemical | medical solution, as shown to FIG.1 (a)-(c) and FIG. , A process (see FIG. 4) of cutting the lower surface of the foundation 11 of the building 10 by cutting the edge from the foundation ground 12 immediately below (see FIG. 4), and a plurality of injections installed through the foundation 11 of the building 10 By injecting a highly fluid grouting chemical into the foundation ground 12 immediately below the ground, which is cut off, the grouting chemical is pumped in the lateral direction along the bottom surface of the foundation 11 of the building 10. And the step of injecting this highly fluid grout chemical solution multiple times with a time interval, including a step (see FIG. 4 (a)). Stacking multiple chemical solution consolidated layers 14a Forming a stacked bed 14 was provided with a (see FIG. 4 (b)).

  In this embodiment, the foundation 11 of the building 10 is a solid foundation in which a foundation slab 11b is arranged inside the outer peripheral rising portion 11a as shown in FIG. In addition, the inner rising portion 11c is also provided at an appropriate position where a partition wall is arranged, for example, in accordance with the floor plan of the first floor portion of the house building 10 on the inner portion of the foundation 11 surrounded by the outer peripheral rising portion 11a. Is provided upright from the foundation slab 11b.

  In addition, the foundation 11 of the building 10 has a substantially horizontally long planar shape in which the width in the east-west direction is larger than the width in the north-south direction, and as a whole sinks, for example, by about 30 to 1000 mm. For example, the subsidence amount of the foundation 11 in the southeast part is larger than the subsidence amount of the foundation 11 in the southwest part, so that the subsidence is inconsistent. In the present embodiment, the settlement of the building 10 can be effectively corrected by pushing up the entire foundation 11 of the building 10 with a predetermined lift-up amount while eliminating the uneven settlement according to the direction described later. .

  In order to correct the subsidence of the foundation 11 of the building 10 that has been subsidized by the subsidence correction method of the present embodiment, first, the lower surface of the foundation 11 of the building 10 is grounded by cutting the edge from the foundation ground 12 of the immediately lower part. . The step of grounding the lower surface of the foundation 11 of the building 10 is performed by setting an appropriate position of the outer peripheral portion where the outer peripheral rising portion 11a of the foundation 11 is arranged, for example, in the same manner as the method described in Japanese Patent Application Laid-Open No. 2008-303623. The position of the pressurizing expansion body 15 is set (see FIG. 3), and the foundation ground 12 at these positions is dug down as shown in FIGS. 4 (a) and 4 (b). A gap 16 is formed between the lower surface and the surface layer portion of the foundation ground 12, and as the pressurizing expansion body 15 that expands and deforms when a fluid pressure is applied to the gap 16 from a flat cross-sectional shape, for example, an expanded steel pipe Can be easily performed by slightly lifting the foundation 11 of the building 10 by pumping and disposing the fluid to the expanded steel pipe 15 to cause expansion and deformation.

  Moreover, after laying an iron plate having a thickness of, for example, about 10 mm as the reaction force receiving plate 17 on the foundation ground 12 side of the formed gap 16, the expanded steel pipe 15 is inserted and arranged in the outer peripheral portion of the foundation 11. It is possible to lift the foundation 11 of the building 10 in a stable state by avoiding biting into the foundation ground 12 by the large contact area by the reaction force receiving plate 17.

  The step of grounding the lower surface of the foundation 11 of the building 10 includes a method of lifting the foundation 11 of the building 10 using a known jack device in addition to a method of lifting the foundation 11 of the building 10 using the pressurized expansion body 15. Etc. can also be adopted. In addition, depending on the geology of the foundation ground 12 below the foundation 11 of the building 10, for example, the fluidity may be increased by a method similar to the method of injecting a highly fluid grout chemical solution described later along the lower surface of the foundation 11. A high grout chemical solution is injected between the lower surface of the foundation 11 and the foundation ground 12 immediately below the foundation 11 to form a thin layer of the grout chemical solution. It is also possible to cut the edge from the foundation ground 12 of the part and cut the ground.

  When the lower surface of the foundation 11 of the building 10 is grounded from the foundation ground 12 in the immediately lower part, the foundation ground 12 in the immediately lower part is grounded through a plurality of injection pipes 13 installed through the foundation 11 of the building 10. By injecting a grouting chemical solution having high fluidity, the grouting chemical solution is pumped in the lateral direction along the lower surface of the foundation 11 of the building 10 (see FIG. 1A).

  Here, the plurality of injection pipes 13 that are installed through the foundation 11 of the building 10 are formed on the solid foundation 11 before or after the step of grounding the lower surface of the foundation 11 of the building 10. After forming a through hole by drilling the basic slab 11b using, for example, a hammer drill or core drill having a diameter of about 24 mm, the injection pipe 13 made of, for example, a known double tube rod is inserted into the formed through hole. In order to prevent the injection pressure from coming off, for example, by inserting and placing the dog nail or rag in a wound state, the tip discharge port faces the foundation ground 12 immediately below the foundation 11 of the building 10, Can be attached.

  In addition, as shown in FIG. 3, the plurality of injection tubes 13 include the size and shape of the foundation 11 of the building 10, the thickness of the foundation slab 11b, the soil quality of the foundation ground 12, the size of subsidence, and the injection of grouting chemicals. In view of pressure, gel time, and the like, it can be attached in a state of being distributed over the entire foundation 11 of the building 10 at an appropriate position with a predetermined interval of, for example, about 2 to 3 m.

  In the present embodiment, the highly fluid grout chemical solution to be injected into the foundation ground 12 immediately below the ground foundation 11 is, for example, about 1 to 300 mPa · s, preferably about 3 to 20 mPa · s, and more preferably. Can use a grout chemical solution having an initial viscosity of about 5 to 20 mPa · s. If the initial viscosity of the grout chemical solution injected into the foundation ground 12 is too low, the fluidity becomes too high and only an extremely thin film can be formed, making it difficult to form the laminated bed 14 with the grout chemical solution. . If the initial viscosity is too high, the fluidity is lowered, and it becomes difficult to pump the grout chemical solution over a wide area in the lateral direction along the lower surface of the foundation 11 of the building 10 by the injection pressure.

  The grout-type chemical solution is preferably a non-aqueous glass-based suspension-type injection material, and is preferably a two-component type chemical solution composed of A liquid and B liquid. In the case of a two-component type chemical solution, for example, the A liquid and the B liquid separately fed through the injection tube 13 made of a double tube rod are mixed in the mixing injection unit, and then the foundation 11 is connected via the discharge port. It can be press-fitted into the foundation ground 12 immediately below.

  As such a grout chemical solution, an instantaneous grouting chemical solution having a gel time (non-fluidization time) of several seconds to several tens of seconds, or a gel time (non-fluidization time) of several tens of seconds to several tens of minutes. A loose-type grouting chemical can be used. More specifically, for example, the trade name “Grand Ace 020A” (manufactured by Mitsui Chemicals, Inc.) having the composition shown in Table 1 can be preferably used.

Here, the instantaneous grouting chemical is preferably used when the foundation ground 12 is difficult to permeate, for example, made of viscous soil. For example, by the injection pressure from the pump, the bottom surface of the foundation 11 of the building 10 is used. The grouting chemical solution is inserted into the base ground 12 directly below this portion as a wedge and is pumped so as to spread laterally along the lower surface of the foundation 11 of the building 10, and after the gel time has elapsed. A solidified layer having a thickness of, for example, about 10 to 300 mm with a homogel having a predetermined compressive strength of, for example, about 0.1 to 10 N / mm ² (MPa), which is capable of supporting lift-up force. 14a is formed (see FIG. 1A).

Further, the loose-type grouting chemical is preferably used in the case where the foundation ground 12 is made of, for example, sandy soil that easily penetrates, and is brought into contact with the lower surface of the foundation 11 of the building 10 by, for example, injection pressure from a pump. The grouting chemical solution is, for example, sandy soil after the gel time has passed by being pumped so as to spread laterally along the lower surface of the foundation 11 of the building 10 while penetrating into the foundation ground of the portion to be Solidified to a thickness of, for example, about 50 to 500 mm with a sand gel having a predetermined compressive strength of, for example, about 0.1 to 40 N / mm ² , which is cured in a state where it has been infiltrated into the material, and can support lift-up force. The layer 14a is formed (see FIG. 1A).

  And in this embodiment, the grout type | system | group chemical | medical solution for forming the 1st consolidated layer 14a between the lower surface of the foundation 11 of the building 10 and the foundation ground 12 of the part directly under this is used for the building 10. After pumping to spread laterally along the lower surface of the foundation 11, the grout-type chemical liquid having high fluidity is applied to the foundation 11 of the building 10 while successively pushing down the injection pipes 13 downward as necessary. By repeating the process of injecting into the foundation ground 12 immediately below a plurality of times at a predetermined time interval, a laminated bed 14 in which a plurality of grouting chemical solution consolidated layers 14 a are laminated below the foundation 11 of the building 10. (See FIG. 1B).

  In the step of forming the laminated bed 14 in which a plurality of grouting chemical solutions 14a are laminated, for example, a time interval equal to or longer than the gel time (non-fluidization time) of the previously injected grout chemical solution is used. In addition, from a plurality of injection tubes 13 installed through the foundation slab 11b of the solid foundation 11, for example, a grouting system having a high fluidity at a pressure of about 0 to 3 MPa and an injection speed of about 2 to 20 L / min. The process of injecting the chemical solution is repeated several times.

A highly fluid grouting chemical injected into the foundation ground 12 continuously from a plurality of injection pipes 13, for example, by the injection pressure from a pressure pump, the lower surface of the consolidated layer 14 a formed in advance and immediately below this While entering like a wedge between a portion of the foundation ground 12 and penetrating like a wedge into the portion of the foundation ground 12 that contacts the lower surface of the previously formed consolidated layer 14a, A predetermined compressive strength of, for example, about 0.1 to 10 N / mm ^2, which can be supported so as to support the lift-up force after the gel time has passed. The solidified layer 14a having a thickness of, for example, about 10 to 500 mm made of homogel or sand gel is sequentially formed in a laminated state below the previously formed consolidated layer 14a.

  In this way, a grout-type chemical solution having high fluidity is repeatedly injected from the plurality of injection tubes 13, and the consolidated layer 14 a is laminated between the lower surface of the foundation 11 of the building 10 and the foundation ground 12 immediately below. By sequentially forming the foundation ground 12, the foundation ground 12 is gradually compacted as necessary, and when the strength sufficient to support the lift-up force is exhibited, the foundation ground 12 is counteracted. As a force receiver, the foundation 11 of the submerged building 10 can be effectively lifted up by the injection pressure of the grout chemical solution.

  Further, a plurality of injection pipes 13 arranged in the region of the southwest part of the building 10 having a large subsidence amount are selected from the plurality of injection pipes 13 distributed over the entire foundation 11 of the building 10, and these injections are selected. By increasing the number of times of repeatedly injecting a grouting chemical solution with high fluidity from the tube 13 over other regions, the amount of lift-up in a region with a large amount of subsidence can be increased to effectively correct the uneven subsidence. It becomes possible.

  Thus, according to the building settlement correction method of the present embodiment, it is possible to efficiently correct the settlement of the building 10 while correcting the uneven settlement.

  Further, in the present embodiment, in addition to the above-described steps, as shown in FIG. 1C, after the step of forming the laminated bed 14, preferably the laminated bed 14 formed through the plurality of injection pipes 14. An injectable solidified product 18 is formed by repeatedly injecting an instant-setting grouting chemical solution several times with a time interval on the lower side, thereby forming the injected solidified material 18 and using the injected solidified material 18 as a reaction force together with the laminated bed 14. A step of lifting the foundation 11 of the building 10 is provided.

  Here, the instantaneous grouting chemical for forming the injection solidified body 18 is a non-aqueous glass suspension injection material having a gel time (non-fluidization time) of several seconds to several tens of seconds. It is preferable that it is a two-component type chemical solution composed of A solution and B solution. In the case of a two-liquid type chemical solution, for example, the liquid A and the liquid B separately fed through the injection tube 13 formed of a double tube rod are mixed in the mixing injection unit, and then the injection tube 14 is pushed down. Thus, it can be press-fitted into the foundation ground 12 in the immediately lower portion through the discharge port facing the foundation ground 12 in the portion immediately below the laminated bed 14.

  More specifically, as such a grout-type chemical solution, for example, a chemical solution using the trade name “Sancohard AQ2-5” (manufactured by Sanko Colloid Chemical Co., Ltd.) as a promoter having a formulation shown in Table 2 is preferable. Can be used.

  The quick-setting grout chemical solution is repeatedly injected into the foundation ground 12 immediately below the laminated bed 14 by a method substantially similar to the method described in Patent Document 1 or Patent Document 2 above, so that the laminated bed 14 On the lower side, it is possible to form a mountain-shaped injection solidified body 18 like a volcano formed of high-viscosity lava, and using the formed injection solidified body 18 as a reaction force, the above-mentioned patent document 1 It is possible to efficiently lift up the foundation 11 of the building 10 together with the stacked bed 14 by a method substantially similar to the construction method described in Japanese Patent Application Laid-Open No. H11-133260.

  Here, the lift-up force using the injected solidified body 18 as a reaction force receiver is locally loaded from below, but in this embodiment, a considerable thickness is provided below the foundation 11 of the building 10. Since the laminated bed 14 is formed, these can be substantially integrated to increase the composite section modulus. Therefore, the bending strength against the load from below is increased, and the foundation slab 11b of the solid foundation 11 is increased. It is possible to effectively avoid damaging the part, widen the interval between the injection tubes 13 for injecting the instantaneous grouting chemical, and reduce the number of the injection tubes 13 to be used. It becomes possible to do.

  Further, since the laminated bed 14 having a considerable thickness is interposed between the lower surface of the foundation 11 of the building 10 and the injection solidified body 18, the lift-up force from the injection solidified body 18 is dispersed and the foundation 11 is dispersed. As well as the load on the foundation 11 can be reduced. Effective lift-up adjustment can also be performed by appropriately selecting the injection tube 13 for injecting the instantaneous grouting chemical.

  Further, in the present embodiment, after the step of forming the laminated bed 14, as shown in FIG. 2, an instantaneous grout is formed between the lower surface of the foundation 11 of the building 10 and the laminated bed 14 through the injection pipe 13. By injecting the system chemical solution, it is possible to provide a step of lifting the foundation 11 of the building 10 using the stacked bed 14 as a reaction force receiver.

That is, for example, a grouting chemical similar to the instant-setting chemical used to form the injection solidified body 18 is used, and preferably the discharge port is disposed so as to be substantially flush with the lower surface of the foundation 11 of the building 10. For example, the grout-based chemical liquid is wedged between the lower surface of the foundation 11 of the building 10 and the upper surface of the layered bed 14 immediately below it by an injection pressure from a pump. The foundation 11 of the building 10 can be lifted up by being pumped so as to spread laterally along the lower surface of the foundation 11 of the building 10 while entering. The injected grout chemical solution is cured with only the grout chemical solution after the gel time has elapsed, and has a predetermined compressive strength of, for example, about 0.1 to 10 MN / m ^{2 and} has a thickness of, for example, about 10 to 300 mm using a homogel. The upper end consolidated layer 19 is formed. As a result, the foundation 11 of the building 10 can be lifted up efficiently by using the laminated bed 14 as a stable reaction force receiver.

  According to the building settlement settlement correction method of the present embodiment having the above-described configuration, it becomes possible to effectively avoid the increase in the unsettled settlement, and the lift-up force due to the chemical solution is widely applied from below the foundation. It is possible to correct the uneven settlement of the building in a stable state by loading in a distributed state.

  That is, according to the present embodiment, the settlement correction method includes a step of grounding the lower surface of the foundation 11 of the building 10 from the foundation ground 12 of the immediately lower portion and a plurality of injections installed through the foundation 11 of the building 10. By injecting a highly fluid grouting chemical into the foundation ground 12 immediately below the ground, which is cut off, the grouting chemical is pumped in the lateral direction along the bottom surface of the foundation 11 of the building 10. And a step of injecting this highly fluid grout chemical solution a plurality of times with a time interval, so that a plurality of consolidated layers 14a of grout chemical solutions are formed below the foundation 11 of the building 10. Since the step of forming the laminated bed 14 is provided, a highly fluid grout chemical solution is injected from the plurality of injection pipes 13 in the lateral direction along the lower surface of the foundation 11. Chemicals Because it interferes and tends to stay around the injection site, for example, the confined pressure of the foundation ground is considered to be small, for example, the injected chemical solution flows out rapidly to the part that is relatively high due to uneven settlement It is possible to effectively prevent the inclination of the building from further increasing by pushing up the foundation so as to rotate in the opposite direction.

  In addition, according to the present embodiment, the grouting chemical solution is injected while forming a laminated bed 14 by laminating a plurality of consolidated layers 14 a spreading in a plane shape along the lower surface of the foundation 11 of the building 10. Since the foundation 11 of the building 10 is lifted up by the pressure, the building is constructed with the lift-up force being dispersed over a wide area through the laminated bed 14 that supports the foundation 11 of the building 10 in a wide area while contacting the surface from below. 10 foundations 11 can be loaded, which makes it possible to correct the uneven settlement of the building in a stable manner.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, a building whose uneven settlement is corrected by the settlement correction method of the present invention does not necessarily have to be a residential building, and can also be adopted when correcting uneven settlement of other various buildings. The building does not necessarily have to be a small building, and may be a large-scale structure. The foundation of the building does not necessarily need to be a solid foundation, and may be, for example, a moisture-proof foundation provided with a foundation slab, a bottom board portion of a box culvert installed on the foundation ground, or the like.

10 residential buildings (buildings)
11 Solid foundation (basic)
11a Peripheral rising part 11b Foundation slab 11c Inner rising part 12 Foundation ground 13 Injection pipe 14 Laminated bed 14a Consolidation layer 15 Expanded steel pipe (pressure expansion body)
16 Gap 17 Reaction force receiving plate 18 Injection solidified body 19 Upper end solidified layer

Claims (5)

In the building subsidence correction method that corrects the uneven subsidence that occurs in the building using grout chemicals,
Cutting the lower surface of the foundation of the building by cutting the edge from the foundation ground in the immediate lower part;
Lateral direction along the bottom surface of the foundation of the building by injecting a highly fluid grouting chemical into the foundation ground directly under the ground through a plurality of injection pipes installed through the foundation of the building A process of pumping a grout chemical solution into
The step of injecting the high fluidity grout chemical solution a plurality of times with a time interval to form a stacked bed in which a plurality of grout chemical solution consolidated layers are laminated below the foundation of the building Building subsidence correction method. After the step of forming the laminated bed, an injectable solidified body is formed by repeatedly injecting an instantaneous grouting chemical solution at a time interval through the injection tube to the lower side of the laminated bed at a time interval. The building subsidence correction method according to claim 1, further comprising a step of lifting up the foundation of the building together with the laminated bed using the injected solidified body as a reaction force receiver. After the step of forming the multi-layer bed, a quick-setting grout chemical solution is injected between the bottom surface of the building foundation and the multi-layer bed through the injection tube, thereby receiving the reaction force of the multi-layer bed. The building subsidence correction method according to claim 1, further comprising a step of lifting up the foundation of the building. The building settlement correction method according to any one of claims 1 to 3, wherein the foundation of the building is a solid foundation or a moisture-proof foundation. The process of cutting the edge of the bottom of the foundation of the building by cutting the edge from the foundation ground of the immediately lower part forms a gap between the lower surface of the foundation and the surface layer part of the foundation ground, From a flat cross-sectional shape, a pressurizing expansion body that is inflated and deformed when fluid pressure is applied to the inside is inserted, and the foundation of the building is lifted by pumping fluid to the pressurizing expansion body to cause expansion and deformation. The subsidence correction method for a building according to any one of claims 1 to 4.

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