JP5301059B1 - Method of tilting structure and improving ground - Google Patents

Abstract

The present invention provides a construction method capable of restoring a tilted structure to a substantially horizontal posture with little effort and at the same time improving the foundation ground causing the tilt.
A step of forming an improved body by ground injection at a predetermined depth and a lower portion of a structure at a substantially central portion of a soft foundation ground of a tilted structure, and lying down on the upper portion of the improved body in a plan view. While repeating the process of forming the next-stage improvement body that spreads into the vertical shape, the soft ground below the structure is sequentially moved from the predetermined depth toward the ground surface layer part while correcting and restoring the tilt of the structure due to the subsidence of the soft ground. Through the process of improving, the tilting of the structure is restored and the soft foundation ground is improved at the same time.
[Selection] Figure 5

Description

  The present invention relates to a construction method capable of improving the ground below a structure while tilting a structure such as a building tilted due to uneven subsidence so as to be corrected to a substantially horizontal posture state.

Conventionally, a soft ground, which is a ground made of landfill or embankment, has a low ground supporting force, and liquefaction and consolidation settlement are likely to occur in an earthquake, so a structure has not been constructed.
However, in recent years, there are examples of building structures above soft ground, and there are relatively many cases in which problems such as unequal subsidence (dissimilar subsidence) surface over time. Here, unequal subsidence means that a structure causes subsidence unevenly. That is, it means a state in which the entire structure does not sink evenly but is inclined obliquely in one direction.
When this uneven subsidence occurs, the members that support the structure of the structure, which must be kept horizontal and vertical, are distorted into parallelograms, trapezoids, etc., and the load concentrates in one place, causing unreasonable concentration. Therefore, a large damage will be given to the structure. In addition, if the structure tilts due to unequal subsidence, rain will blow in from the window, doors and sashes will not be locked, and airtightness will be lost and the effectiveness of the air conditioner will deteriorate. To do.
In addition, since the Great East Japan Earthquake, many health problems have been reported due to living in inclined structures of 0.5% or more.

  Originally, when constructing a structure above soft ground, it is necessary to take sufficient measures against soft ground. For example, a reinforcing bar or steel pipe is inserted into a hole formed by boring or the like together with a solidified material such as mortar and the reinforcing bar is fixed in the ground with a solidified material, or injected into the hole. Insert the tube, inject the caking material into the ground through the injection tube, and reinforce by solidifying the entire ground.In addition, insert the injection tube with the bag body into the drilling hole and insert the bag through the injection tube Plastic gel or cement grout on the body (grouting is a fluid liquid that is injected to fill cavities, voids, gaps, etc. during construction work. Cement, glass, and synthetic resins are used. There is known a method in which a solidified body is formed in the ground by injecting a solidifying material such as), and the ground is consolidated by utilizing the consolidation effect of the ground due to the expansion of the solidified body.

  By the way, the soft ground is not uniform in ground properties due to changes in soil quality and layer thickness, etc. If the consolidation settlement proceeds non-uniformly after the construction of the structure, the structure tends to cause uneven settlement. Even after careful ground investigation and sufficient soft ground countermeasures, the behavior of the soft ground after the construction of the structure (for example, ground strength decreases due to groundwater infiltration, groundwater pressure increases due to groundwater level rise) In addition, it may be difficult to accurately grasp the liquefaction caused by the increase in pore water pressure during an earthquake. In addition, it may be difficult in terms of time and economy to predict unequal subsidence in advance and to take measures according to the subsidence in advance.

  In addition, when the foundation of the structure is placed on sandy ground, etc., sandy ground, etc. has a high bearing capacity statically because it does not easily cause consolidation settlement, but there is abundant groundwater, which is excessive moisture, and Sometimes the groundwater level rises due to the increase in pore water pressure, and the ground rapidly loses its bearing capacity. As the water pressure to the ground rises due to the rise of the groundwater level, buoyancy acts on the sand (soil) particles, so that the strength of the sand is lowered and the ground bearing capacity is lowered. As a result, the foundation sinks.

  Therefore, as a countermeasure against soft ground, not only the structure of the foundation of the structure is difficult to cause unequal subsidence, but also the structure sunk or tilted for some reason such as earthquake or storm and flood damage, etc. If this happens, it will be necessary to destroy the structure and reconstruct it if it is too severe. The development of a technology that can correct the problem later is desired.

  A technique for correcting the tilt of a structure using a jack when unequal subsidence occurs in the structure is also disclosed, but simply by jacking up the sinked part of the structure, Since it is necessary to correct the inclination while lifting the structure while supporting a large weight, it is difficult to correct the work while balancing the entire structure. In addition, it takes a lot of work to re-integrate the frame part of the lifted structure with the foundation and foundation, and if the integration is insufficient, the stability is impaired, and much labor and cost are required. In addition, since a part of the structure must be demolished in order to set the jack, additional labor and cost are required. And even if the height and inclination of the structure are corrected using a jack, there is a problem that the structure may sink or tilt again depending on the condition of the ground.

  Therefore, it consists of a base layer of the ground below the structure, a plurality of support piles provided in the ground to support the central part of the base layer, and a solid foundation placed over the base layer, In the basement layer, the central part supported by the support pile is raised one step higher, the central part of the solid foundation is placed, and the adjustment sand is placed in the gap between the basement layer and the solid foundation around the central part. Has been proposed to provide the foundation structure of the structure that can correct the inclination of the structure when the subsidence occurs in the structure built above the soft ground (Patent Document) 1).

  In addition, when a structure sinks or tilts and attempts to correct the height or tilt of such a structure, a preliminary survey is conducted and the ground in each other area is excluded except where it is not sinking. By filling the injection pipe (liquid material) injection pipe directly below and mixing and diffusing the two types of injection material in the ground, it fills the void in the ground and reacts the two types of injection material to form a solid Turn into. In this way, the injected material fills the voids in the ground and solidifies, increasing the volume and hardness of the underground tissue, and the ground that has expanded and hardened pushes the upper ground from below. A technique has been proposed in which the foundation of the structure is raised from a deep place to a shallow place where the solidified ground is deepened (see Patent Document 2).

Japanese Patent No. 4773797 JP-A-9-13416

However, in the technique disclosed in Patent Document 1, it is necessary to form a support pile with extra cost and labor in order to facilitate correction when the building is tilted afterwards when a structure is newly constructed. In addition, in the case where uneven subsidence or the like actually occurs in the structure built above the soft ground, it is necessary to use adjustment sand to correct the inclination of the structure.
In the first place, if support piles etc. are purposely formed at the time of new construction of the structure, it is possible to take measures against the soft ground so that the structure does not tilt. Can be fully implemented. In reality, it is often difficult to apply the technique disclosed in Patent Document 1 from the viewpoint of cost.

In addition, the technique disclosed in Patent Document 2 is used to lift a non-sinked location and a lifted fulcrum when the distance between each location that is not yet settled is long. A large force is required, and it is difficult to lift easily, and there is a possibility that one side such as the base of the structure bends and deforms by about 1 cm or more and becomes weak and cracks. Therefore, there is a risk that the structure will be defective and the finish will be poor (cracking, distortion to joinery, poor horizontal accuracy of the floor, etc.).
Furthermore, the technique disclosed in Patent Document 2 does not improve the entire ground below the structure, and since the ground below the unsinked portion remains soft, problems such as subsidence may occur in the future. May occur.

  The object of the present invention is to easily tilt the structure tilted due to unequal subsidence due to liquefaction, soft ground, etc., without using jacks or adjusting sand, and correct it to a substantially horizontal posture state with little force. In addition, an object of the present invention is to provide a method of tilting the structure and improving the ground which can simultaneously improve the overall ground below the structure.

The first method of tilting the structure and improving the ground according to the present invention is as follows.
A structure constructed above the soft ground, the structure tilting and ground for correcting the ground of the soft ground as well as correcting the structure tilted by the foundation to the substantially horizontal posture state. Improved method,
Forming a support for the vicinity of the center of the soft ground corresponding to the region where the inclined foundation was formed;
By forming the support, the surface layer of the ground contacting the substantially central portion of the tilted foundation is raised to a generally flattened saddle shape with a substantially central portion rising, and the tilted foundation is supported with the top portion of the generally flattened saddle shape as a fulcrum. Lifting the substantially central part of the base and supporting it in a balance state to make it easy to tilt the entire tilted foundation,
The support is further formed at a position that expands substantially concentrically around the fulcrum in plan view and from a deep position in the ground toward a shallow position so as to lift the position where the inclined foundation is to be lifted. By raising the surface layer of the ground that abuts the periphery of the portion corresponding to the position to be lifted of the tilted foundation, and lifting and supporting the tilted foundation,
The tilted base is tilted in an arbitrary direction while tilting the whole tilted foundation in the balance state with the top portion of the generally lying down shape as a fulcrum, and the structure is also tilted along with the tilted base. While making it a posture state, the ground improvement of the said soft ground is performed by construction of the said support body, It is characterized by the above-mentioned.
By going through such a process, a cement-based injection material (liquid material) is injected into the soft ground to build a cement improvement body as a support, and due to pressure transmission and consolidation accompanying the increase in volume, In order to correct the inclination of the structure (corresponding foundation) after raising the soil in the center of the existing ground structure (corresponding foundation) and making the structure (corresponding foundation) itself a balance state (hinge state) By further improving the cement on the ground corresponding to the position to be lifted and increasing its volume, it is possible to freely correct the inclination of the structure and return it to a substantially horizontal posture state.
In order to achieve the balance state (hinge state), the external load applied to the structure is smaller than that of the conventional method. As a result, the rotational moment (structure load W × distance L) can be reduced and the structure can be used without difficulty. You can correct the inclination of.
In addition, since the center is lifted beforehand as a fulcrum, the gap amount is small and the generated strain can be made smaller than the conventional building settlement settlement method (i-LIFT method, etc.), so the effect on the structure (strain to joinery) Occurrence and cracks in concrete, etc.). Furthermore, when the amount of strain is small, there is an effect that the finish of the structure is improved.
In addition, it has the advantage of improving the ground directly under the structure and the surrounding area while correcting the settlement of the structure. For this reason, the cost has been increased separately in the past, but the cost can be reduced by performing simultaneously.
By performing a step-by-step injection operation by changing the depth from the deep underground to the shallower one, the step-by-step injection operation by changing the depth from the deep underground to the shallower one By performing the above, the solidified ground is piled up one after another, and thereby a large ascending force that pushes up the ground can be exhibited, and the settlement and inclination of the structure can be corrected reliably.
In addition, the second structure tilting method and ground improvement method of the present invention are:
A structure constructed above the soft ground, the structure tilting and ground for correcting the ground of the soft ground as well as correcting the structure tilted by the foundation to the substantially horizontal posture state. Improved method,
Forming a support for the vicinity of the center of the soft ground corresponding to the region where the inclined foundation was formed;
By forming the support, the surface layer of the ground contacting the substantially central portion of the tilted foundation is raised to a generally flattened saddle shape with a substantially central portion rising, and the tilted foundation is supported with the top portion of the generally flattened saddle shape as a fulcrum. Lifting the substantially central part of the base and supporting it in a balance state to make it easy to tilt the entire tilted foundation,
By further forming the support so as to lift the position where the inclined foundation is desired to be lifted, the surface layer of the ground contacting the periphery of the portion corresponding to the position where the inclined foundation is desired to be lifted is A process of lifting and supporting the foundation,
The tilted base is tilted in an arbitrary direction while tilting the whole tilted foundation in the balance state with the top portion of the generally lying down shape as a fulcrum, and the structure is also tilted along with the tilted base. While making it a posture state, the ground improvement of the said soft ground is performed by construction of the said support body, It is characterized by the above-mentioned.
In addition, the structure tilting method of the present invention, which does not necessarily have the purpose and effect of ground improvement,
A structure tilting method that corrects a tilted structure to a substantially horizontal posture with a tilted foundation.
Forming a support for the vicinity of the center of the ground corresponding to the region where the inclined foundation was formed;
By forming the support, the surface layer of the ground contacting the substantially central portion of the tilted foundation is raised to a generally flattened saddle shape with a substantially central portion rising, and the tilted foundation is supported with the top portion of the generally flattened saddle shape as a fulcrum. Lifting the substantially central part of the base and supporting it in a balance state to make it easy to tilt the entire tilted foundation,
By further forming the support so as to lift the position where the inclined foundation is desired to be lifted, the surface layer of the ground contacting the periphery of the portion corresponding to the position where the inclined foundation is desired to be lifted is A process of lifting and supporting the foundation,
The tilted base is tilted in an arbitrary direction while tilting the whole tilted foundation in the balance state with the top portion of the generally lying down shape as a fulcrum, and the structure is also tilted along with the tilted base. It is characterized by being in a posture state.

  According to the present invention, a structure tilted due to unequal subsidence or the like due to liquefaction or soft ground without using a jack or adjusting sand is easily tilted with a small force to be corrected to a substantially horizontal posture state. In addition, it is possible to provide a method for tilting the structure and improving the ground, which can simultaneously improve the overall ground below the structure.

It is a figure explaining the state in which the building in embodiment of this invention inclined by unequal subsidence. It is a flowchart which shows the flow of each process in embodiment of this invention. It is a figure of the amount of settlement of the foundation of the building in an embodiment of the invention. It is a figure which shows the injection | pouring position of the injection material in embodiment of this invention. It is a mimetic diagram explaining raising the ground in an embodiment of the present invention, supporting the foundation of a building in a balance (hinge) state, and adjusting the inclination gradually to a substantially horizontal posture state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the structure tilting and ground improvement method of the present embodiment is a building constructed above soft ground on the premise of a building such as a house as a structure, and is based on uneven settlement. This is a construction method that can correct a building that has been tilted along with this to a substantially horizontal posture and can also improve the entire soft ground below the building.

First, the concepts and relationships of the building body, foundation, foundation, and ground are organized.
As a rule of thumb, there is a foundation below the building body, a foundation below the foundation, and a ground below the foundation.
The foundation is used to firmly connect the framework of the building body and the foundation that supports the building body. Even if it is a wooden building, the foundation is often made of concrete, so it is easier to join it through a wooden base. The load of the building body is concentrated on the bottom of the pillar along the pillar, but the weight from the pillar is equalized so that the ground does not cause unequal subsidence that causes the ground to partially sink or slide out. And support the building body in a well-balanced manner throughout the foundation.
The foundation is a structure for effectively transmitting the building weight to the ground. The foundation, which is the lowest part of the building, plays a role in firmly supporting the building and the ground by conveying the weight of the building to the ground and supporting it. The cloth foundation is provided at the outer periphery of the building or under the framework (shaft assembly) of the main partition wall, and has a reverse T-shaped cross section to widen the bottom of the foundation. This width is determined by the load from the top and the magnitude of the earth bearing capacity. For example, if it is diagnosed as a result of the ground survey that it can withstand up to 5 tons per square meter, a standard fabric foundation is used. In addition, as a result of the ground survey, in the case of a slightly soft ground with a ground bearing strength of 3t or more and less than 5t per square meter, the width of the base where the foundation and the ground surface are in contact with each other is increased, and the grounding surface is increased to increase the load. By being dispersed, the same effect as lightening the building is obtained, and the settlement is made smaller. Furthermore, widening of the base can deal with ground strength of 3 tons per square meter, so in the case of soft ground with ground strength of 2 to 3 tons, hit concrete under the entire floor, unequal as a solid foundation Equalize settlement.

Next, with reference to FIG. 2, the flow of each step in the method of tilting the structure and improving the ground according to this embodiment will be described in detail.
In addition, the following are mentioned as a use machine in the construction method of the structure tilting and ground improvement of this Embodiment.
Dump truck 2t 1 Unic vehicle 4t 2 Air compressor 25HP 1 Rock breaker 2 Mortar mixer 500 liter kneading 2 Injection pump 3 Injection meter (Monitor for injection control) 3 Electric pick (hammer) 1 Concrete Cutting machine 1 unit Injection machine Hand pressure gauge 3 units Multiple double tube rods (Length: 9.25m)
Etc. may be used.

  Referring to FIG. 2, first, in step S01, a geological survey is performed on the soft ground below where the building is built by the SWS test (Swedish sounding test). Based on the results of this geological survey, the soft ground is confirmed and the depth of improvement is determined.

The values of the results of the SWS test are shown below. Here, the results of the SWS test are shown by three indicators of depth (m), converted N value, and estimated soil quality.
At a depth of 0.25 m, the N value is 2.0. The estimated soil quality is sandy embankment.
At a depth of 0.50 m, the N value is 1.0. The estimated soil quality is sandy embankment.
At a depth of 0.75 m, the N value is 2.5. The estimated soil quality is sandy embankment.
At a depth of 1.00 m, the N value is 3.3. The estimated soil quality is sandy embankment.
At a depth of 1.25 m, the N value is 6.2. The estimated soil quality is sandy embankment.
At a depth of 1.50 m, the N value is 4.4. The estimated soil quality is sandy embankment.
At a depth of 1.75 m, the N value is 3.3. The estimated soil quality is sandy embankment.
At a depth of 2.00 m, the N value is 3.3. The estimated soil quality is sandy embankment.
At a depth of 2.25 m, the N value is 3.0. The estimated soil quality is sandy embankment.
At a depth of 2.50 m, the N value is 3.0. The estimated soil quality is sandy embankment.
At a depth of 2.75 m, the N value is 3.8. The estimated soil quality is sandy embankment.
At a depth of 3.00 m, the N value is 2.5. The estimated soil quality is sandy embankment.
At a depth of 3.25 m, the N value is 0.7. The estimated soil quality is silt.
The N value is 0.7 at a depth of 3.50 m. The estimated soil quality is silt.
The N value is 3.0 at a depth of 3.75 m. The estimated soil quality is silt.
At a depth of 4.00 m, the N value is 3.6. The estimated soil quality is silt.
The N value is 6.0 at a depth of 4.25 m. The estimated soil quality is silt.
At a depth of 4.50 m, the N value is 4.4. The estimated soil quality is silt.
At a depth of 4.75 m, the N value is 3.2. The estimated soil quality is silt.
At a depth of 5.00 m, the N value is 1.5. The estimated soil quality is silt.
At a depth of 5.25 m, the N value is 2.2. The estimated soil quality is silt.
At a depth of 5.50 m, the N value is 3.0. The estimated soil quality is sandy.
At a depth of 5.75 m, the N value is 4.4. The estimated soil quality is sandy.
At a depth of 6.00 m, the N value is 6.8. The estimated soil quality is sandy.
At a depth of 6.25 m, the N value is 7.6. The estimated soil quality is sandy.
At a depth of 6.50 m, the N value is 5.2. The estimated soil quality is sandy.
The N value is 4.1 at a depth of 6.75 m. The estimated soil quality is sandy.
At a depth of 7.00 m, the N value is 12.9. The estimated soil quality is sandy.
At a depth of 7.25 m, the N value is 13.5. The estimated soil quality is sandy.
At a depth of 7.50 m, the N value is 4.9. The estimated soil quality is sandy.
At a depth of 7.75 m, the N value is 15.1. The estimated soil quality is sandy.
From the above results, the depth (GL) for starting improvement is determined from 7.50 m in the upper layer of 7.75 m where the N value is 15. The N value of 15 is a value that is said not to be liquefied with hard soil. In addition, since there is a layer presumed to have been filled in advance when building the building, it will be improved from 7.75 m to 2.50 m.

Next, in step S02, prior to construction, a survey of the inclination of the building (amount of settlement due to liquefaction or the like), the status of the buried pipe, and other structures is performed.
The building here is based on the premise that the floor area of the first floor is about 81.1 square meters (the foundation is a solid foundation), and the amount of settlement of the building is as shown in FIG. 3 (area in plan view). That is, the subsidence degree of each part as shown in FIG. 3 was measured, and the upper left area of the four corners was the most subsidized with 150 mm, and the lower left area was not submerged. Yes, the upper right area is 140 mm and the lower right area is 30 mm. In addition, it can be considered that the foundation of a building is the same amount of sedimentation in the location corresponding to each location of a building.

Next, in step S03, curing of buildings, parking lots, entrances and the like is performed for safe construction.
In step S04, as the drilling position excavation, a pre-drilling is performed so as not to damage the embedded object when drilling.
Further, in step S05, as excavation of the buried object position, gas, water, sewage, etc. are made to follow the previous excavation so that there is no breakage during construction.

Next, in step S06, the ground around the building (foundation) is drilled vertically and obliquely using a compressor and a rock drill, and a plurality of injection pipes (double pipe rods) are respectively placed at predetermined positions and depths. Install it. Details of this position and depth will be described later.
An injection tube is embedded and set at a predetermined angle in each ground at each location. A boring machine is used to set up such an injection pipe. That is, the injection pipe is set so that the opening tip comes to a predetermined depth position in the ground below each part of the foundation of the building that has been sunk and inclined. The number of locations where the injection tube is embedded may be increased or decreased according to the situation judgment at that time. Also, the injection angle of the injection tube is confirmed using a protractor.
An injection plant is connected to the rear end portion of such an injection pipe via a hose, and this injection plant can feed the injection material into the injection pipe via the injection pump with a generator as a driving force. It has become.

Next, in step S07, each material is kneaded with a mortar mixer to obtain an injection material, and then injected into an injection tube with an injection pump (discharging capacity is 6 liters / minute). The injection material is injected while monitoring the injection volume and pressure on the monitor. It is said that the N value is 15 if the pressure is the initial pressure (equal to the groundwater pressure) + 1 kgf / square centimeter, but here the injection material is injected while monitoring the pressure so that the pressure becomes the initial pressure + 2 kgf / square centimeter. Therefore, the N value is always 15.
The injection material performs simultaneous injection in at least three directions and three locations. As a result, the injected material is supplied (shot) into the ground from the opening tip of the injection tube, and the supplied injected material penetrates and diffuses into the underground space. The structure of the ground is generally softer in the upper part than in the lower part, and the pressure from the ground is lower in the upper part than in the lower part, so the injected material supplied into the ground mainly diffuses upward in the ground. Go.

Moreover, the following are mentioned as a material used as an injection material, for example. However, the material is not limited to these and widely known materials may be used.
Sanko Hard AQ 2-5 seconds Total injection amount 36.0 cubic meters Breakdown Ratio of liquid A Normal Portland cement 125 kg vs. Sanko Hard AQ 2-5 seconds accelerator 16 kg vs. Water 153 liters B liquid ratio Sanco Hard AQ 2-5 seconds hardener 20.8 kg 197 liters of water In connection with this, the injection pipe has a double structure through which the liquid A and the liquid B pass separately, and the liquid A and the liquid B are discharged from the injection pipe and mixed with each other in the ground. Then, after the diffusion, it is solidified. When the muddy water (injection material) of liquid A and liquid B is mixed, it gels (solidifies) in 5 to 10 seconds.
Here, the total injection amount of Sanko Hard AQ2-5 seconds is 36.0 cubic meters, but usually it is so-called compact soil if the water content ratio of the ground is about 25%, and if it is 30% or more, it is easy to liquefy. It is said. Therefore, we would like to reduce the water by about 10% to a water content ratio of about 25%, so that 10% of about 400 cubic meters of 1m floor area of about 81.1 square meters and a height of 5m (depth from 7.50m to 2.50m) is colloidal. In order to make it and replace it with water, the injection amount is 36.0 cubic meters. That is, the A and B liquids mix and diffuse in the ground, filling the voids in the ground, and the A and B liquids react to solidify. In this way, the filling material solidifies by filling the voids in the ground, so that the collapsed cancellous body expands and hardens with water, so that the volume and hardness of the subsequent underground tissue Will increase. In this way, the ground that has expanded and hardened pushes up the upper ground from below and raises it, and such solidified ground is stacked in layers from deep to shallow Thus, the foundation of the building can be lifted (raised).

  Next, in step S08, while stepping up (changing the implantation depth) or changing the implantation position, the combination of the implantation depth and position from at least three directions and three locations is changed and balance is maintained. The ground is improved while correcting the inclination of the building so that it will not be bent (the deflection is within about 5 mm).

Next, in step S09, the change in the height of the building is measured indoors and outdoors.
In step S10, measurement of the deformation of the building, the deformation of the buried pipe, the confirmation of the influence on the adjacent structure and the building is performed.

  Steps S06 to S10 are repeated until the building tilted at the time of construction is corrected to a substantially horizontal posture state.

  Hereinafter, with reference to FIGS. 4 and 5 in particular, an example of a specific implementation schedule in steps S06 to S08 will be shown. In FIG. 5, for ease of understanding, only two injection pipes are shown on the left and right sides, and the cement improvement body is shown up to the fourth day with the fifth and subsequent days omitted.

  As a general rule, the injection material is injected in the vicinity of the center of 3 to 4 places on the 1st to 2nd days, and from the 3rd day, it is basically in a position where it expands concentrically and from a deep position The injection material is injected so as to shift to a shallow position.

By the previous day, curing, excavation, buried object confirmation, etc. should be completed.
The first day of drilling and injection is 4000 liters of injection material. The implantation depth for each position is 7.5 to 7.0 m for (1) and (2), and 7.5 to 5.5 m for (3).
The drilling and injection on the second day is 8000 liters of injection material. The implantation depth at each position is 7.0 to 6.0 m for (1) and (2), 7.5 to 5.5 m for (5), and 5.5 to 4.0 m for (3). And

The volume in the vicinity of the center in the region of FIG. 3 where the injection material is injected is increased by the construction of the cement improvement body, a part of the ground is pushed up, the density of the ground is increased, and the injection material is further injected. Then, the vicinity of the center of the surface layer of the ground is gently raised (may be about 1 to 2 cm) in a shape along the uppermost broken line in the schematic diagram of FIG. In other words, the broken line in the schematic diagram of FIG. 5 (a) shows the propagation of consolidation, but due to the transmission of sediment pressure generated with the increase in volume due to the construction of the cement improvement body in this way, consolidation of the existing sediment occurs, The surface layer is raised. As shown by the arrows in the schematic diagram of FIG. 5 (a), the transmission above the earth and sand pressure is the largest at an angle of 90 degrees (consolidation is large) and decreases as the distance from the top (center) increases. (Medium compaction / consolidation), but the transmission of pressure is almost unaffected at an angle of 30 to 45 degrees (repose angle), although it varies somewhat depending on the soil quality. Therefore, the pressure is easily transmitted immediately above the injection point near the center in the region of FIG. 3 where the injection material is injected (substantially under the center of the building), and the ground has a large bulge. On the other hand, the pressure is transmitted as the distance from the top increases. It becomes difficult and the ridges become smaller, resulting in a gentle uplift as a whole. The schematic diagram of FIG. 5 (b) is the same as the consolidation propagation principle of FIG. 5 (a), but in reality, FIG. 5 (b) is superimposed on the state after the bulge of FIG. 5 (a). It becomes a state.
In this way, the surface layer of the ground that is in contact with the substantially central portion of the inclined foundation is raised to a generally flattened saddle shape with the substantially central portion raised, and the substantially central portion of the inclined foundation is lifted with the top portion of the substantially flattened saddle shape as a fulcrum. Supporting the balance state (in a metaphorically metaphoric state), the entire tilted foundation is easily tilted.
Then, after the third day, in order to lift the position where the tilted foundation is to be lifted, the depth is changed from a deep part in the ground toward a shallow part to a position spreading in a substantially concentric circle centered on the fulcrum in plan view. The injection material is repeatedly injected step by step. A cement improvement body is further built, and by increasing the volume, the surface layer of the ground contacting the periphery of the portion corresponding to the position to be lifted among the tilted foundations is lifted and supported (FIG. 5 (c)). And FIG. 5 (d)). It should be noted that the injection material is also injected into a relatively high position as shown in the lower left area of FIG. 3 for overall ground improvement of the area, etc., but considering the pressure balance so that it is difficult to lift. The so-called Mole method in tunnel construction will be implemented.

Subsequently, the drilling and injection on the third day is performed with an injection material of 8000 liters. The implantation depth for each position is 6.0 to 5.0 m for (1) and (2), 7.5 m for K, (5) is 5.5 to 4.5 m, (4) is It is set to 7.5 to 5.5 m.
The drilling and injection on the fourth day is 8000 liters of injection material. (1) and (2) are 5.0 to 4.0 m, ABCDEGILK is 7.5 m, (5) is 5.5 to 4.0 m, and (4) is 5.5 to 4.0 m. .
The drilling and injection on the fifth day is 6000 liters of injection material. (1) and (2) are 5.0 to 4.0 m, (3) to (5) are 4.0 to 3.0 m, and ABCDEFGHILK is 7.5 m.
The drilling and injection on the sixth day is 2000 liters of the injection material. (1) to (5) and ABCDEFGHILK are set to 7.5 m to 2.5 m.

  In this way, by injecting a total injection amount of 36000 liters (36 cubic meters) of the injection material into the entire region, the cement improvement body around the predetermined position on the surface layer of the ground corresponding to the region where the inclined foundation was formed. It is possible to build up and swell, lift and support the tilted foundation, gradually tilting the entire tilted foundation in the arbitrary direction while tilting the whole tilted foundation with the top of the prone face as a fulcrum In addition to adjusting the inclination of the structure, the structure is also tilted to be in a substantially horizontal posture, and the ground of the soft ground can be improved so that the ground has an N value of about 15 by building a cement improvement body. . In addition, the cost can be reduced in a short construction period.

[Modification]
Since the amount of subsidence and the ground structure in each part of the foundation are different from each other, the injection amount, injection speed, continuous or intermittent injection, time to gelation, injection pressure, etc. at each position You may inject | pour, adjusting and changing conditions. The diffusion range of the injection material in the ground becomes wider as the time until gelation is increased by changing the material or changing the mixing ratio of the A liquid and the B liquid.

  As long as it is within the range of solidifying in the ground, any mixture of injection material may be used. Of course, the amount of liquid A and liquid B can be increased or decreased depending on the situation.

  Moreover, it is applicable not only to a solid foundation but also to a cloth foundation type. The method of tilting the structure and improving the ground according to the present embodiment is a correction of the tilt of the building due to the elevation of the ground itself, and can be applied to a cloth foundation that is a lattice foundation because the strain is smaller than that of the conventional method.

  Furthermore, the present invention can be applied to any structure such as a building other than a house, such as a gymnasium, a theater, a hotel, a merry-go-round, or a bridge.

  In addition, although not illustrated one by one, the present invention may be implemented with various modifications within a range not departing from the gist thereof.

Claims (3)

A structure constructed above the soft ground, the structure tilting and ground for correcting the ground of the soft ground as well as correcting the structure tilted by the foundation to the substantially horizontal posture state. Improved method,
Forming a support for the vicinity of the center of the soft ground corresponding to the region where the inclined foundation was formed;
By forming the support, the surface layer of the ground contacting the substantially central portion of the tilted foundation is raised to a generally flattened saddle shape with a substantially central portion rising, and the tilted foundation is supported with the top portion of the generally flattened saddle shape as a fulcrum. Lifting the substantially central part of the base and supporting it in a balance state to make it easy to tilt the entire tilted foundation,
The support is further formed at a position that expands substantially concentrically around the fulcrum in plan view and from a deep position in the ground toward a shallow position so as to lift the position where the inclined foundation is to be lifted. By raising the surface layer of the ground that abuts the periphery of the portion corresponding to the position to be lifted of the tilted foundation, and lifting and supporting the tilted foundation,
The tilted base is tilted in an arbitrary direction while tilting the whole tilted foundation in the balance state with the top portion of the generally lying down shape as a fulcrum, and the structure is also tilted along with the tilted base. A method for tilting the structure and improving the ground, wherein the ground is improved by the construction of the support and the soft ground is improved. A structure constructed above the soft ground, the structure tilting and ground for correcting the ground of the soft ground as well as correcting the structure tilted by the foundation to the substantially horizontal posture state. Improved method,
Forming a support for the vicinity of the center of the soft ground corresponding to the region where the inclined foundation was formed;
By forming the support, the surface layer of the ground contacting the substantially central portion of the tilted foundation is raised to a generally flattened saddle shape with a substantially central portion rising, and the tilted foundation is supported with the top portion of the generally flattened saddle shape as a fulcrum. Lifting the substantially central part of the base and supporting it in a balance state to make it easy to tilt the entire tilted foundation,
By further forming the support so as to lift the position where the inclined foundation is desired to be lifted, the surface layer of the ground contacting the periphery of the portion corresponding to the position where the inclined foundation is desired to be lifted is A process of lifting and supporting the foundation,
The tilted base is tilted in an arbitrary direction while tilting the whole tilted foundation in the balance state with the top portion of the generally lying down shape as a fulcrum, and the structure is also tilted along with the tilted base. A method for tilting the structure and improving the ground, wherein the ground is improved by the construction of the support and the soft ground is improved. A structure tilting method that corrects a tilted structure to a substantially horizontal posture with a tilted foundation.
Forming a support for the vicinity of the center of the ground corresponding to the region where the inclined foundation was formed;
By forming the support, the surface layer of the ground contacting the substantially central portion of the tilted foundation is raised to a generally flattened saddle shape with a substantially central portion rising, and the tilted foundation is supported with the top portion of the generally flattened saddle shape as a fulcrum. Lifting the substantially central part of the base and supporting it in a balance state to make it easy to tilt the entire tilted foundation,
By further forming the support so as to lift the position where the inclined foundation is desired to be lifted, the surface layer of the ground contacting the periphery of the portion corresponding to the position where the inclined foundation is desired to be lifted is A process of lifting and supporting the foundation,
The tilted base is tilted in an arbitrary direction while tilting the whole tilted foundation in the balance state with the top portion of the generally lying down shape as a fulcrum, and the structure is also tilted along with the tilted base. A structure tilting method characterized by a posture state.

Images