JP2008291579A - Differential settlement correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building differential settlement correction method which contributes to drastic improvement in work performance and economy, and enables repeated execution of correction of a building foundation undergoing differential settlement a plurality of times. <P>SOLUTION: According to the differential settlement correction method, a plurality of filling bags 14 which each have an injection port 20 for injecting a liquid harder 24 are vertically stacked on each other under the building foundation 22, and an upper-side rigid plate 12 is inserted between a stacked body of the filling bags 14 and the foundation 22. When differential settlement of the foundation 22 occurs, the predetermined liquid hardener is injected into at least one of the filling bags 14 stacked on each other via the injection port 20 to inflate the filling bag 14, and therefore the upper-side rigid plate 12 is lifted upward until the foundation 22 undergoing differential settlement is raised to a predetermined height via the upper-side rigid plate 12. In this raised state, the liquid hardener 24 injected into the filling bag 14 is hardened, and the differential settlement is corrected. The above procedures can be repeatedly carried out a plurality of times. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an unequal subsidence correction method, and more particularly to a method of correcting a foundation of a building that inevitably subsidizes with time depending on the state of the ground.

  Conventionally, residential land development has been carried out in relatively good ground conditions, but in recent years, wetlands, swamps, hills, etc. that have not lived until now have been developed and residential land has been created. . When we built residential land such as swamps, swamps, hills, etc., there are not many residential lands that can support the house (the ground can withstand the load). Some foundation reinforcement and ground reinforcement, such as driving piles, are increasing. However, such foundation reinforcement and ground reinforcement often involve enormous costs, and there are rare cases where foundation reinforcement or ground reinforcement cannot be performed depending on the construction environment or ground condition. For this reason, after construction, the buildings may sink unevenly (uneven settlement), and the entire building (housing) may be tilted or partially collapsed. .

  In particular, buildings (houses) built on soft ground have a great risk of uneven settlement over time due to soil compaction, compression, etc., and buildings that have been tilted due to uneven settlement will be restored or restored. Even after repairing, after several years, the building may tilt again, and it becomes necessary to correct the uneven settlement several times until the ground stabilizes and the uneven settlement ends.

  By the way, an underpeening method or a chemical solution injection method has been conventionally used for restoration or repair of a building that has sunk unevenly. Of these, the underpeening method excavates below the sinked foundation to a depth of about 1 m, and uses the weight of the building directly below the foundation to make a steel pipe pile of about 100-200 mm on a hard support ground. After press-fitting with welding or the like until it reaches it, use the reaction force of the ground to push the foundation up with a jack and level it, and then remove the jack and fix the foundation while keeping the level This is a method of correcting uneven settlement. On the other hand, in the chemical injection method, chemicals such as cement milk, mortar, and synthetic resin were sequentially injected from a portion of a depth of about 5 to 10 m below the sinked foundation to harden the ground at the same time. This method uses the reaction force of the ground to push up the foundation with chemical injection pressure, etc. and restore it horizontally to correct uneven settlement.

  However, in the above-mentioned underpeening method, it is necessary to dig a hole with a depth of about 1 m that a person can enter in order to place a steel pipe pile, so that a large work space is required. Costs are extremely high due to the necessity and large-scale construction. Specifically, in a general detached house, when subsidence correction is performed by an underpeening method, it is said that it costs about 5 to 10 million yen (Non-Patent Document 1). In addition, when there is a large rock or the like on the ground below the foundation of the building, there is a problem that a steel pipe pile cannot be driven.

  On the other hand, the chemical solution injection method does not require a large work space like the underpeening method, but it is necessary to sequentially inject the chemical solution upward from the hard support ground, which requires a large amount of chemical solution, which is expensive. In addition, the unintended location may be lifted, or the injected chemical may flow into locations other than the intended location.

  For this reason, the unequal settlement correction method of a building replacing the underpeening method and the chemical solution injection method has been studied (for example, Patent Documents 1 to 3). However, none of them is still sufficient to correct repeated unequal subsidence, and has room for improvement.

Japanese Patent Publication No. 7-6208 JP 7-238564 A Japanese Patent Laid-Open No. 9-158235 “Foundation”, Vol. 34, no. 10, October 2006, p. 48-49

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that the workability and the economic efficiency can be drastically improved, and unequal subsidence is achieved. An object of the present invention is to provide a method for correcting uneven settlement of a building, which can repeatedly correct the foundation of the building.

  In order to solve such problems, the gist of the present invention is that (A) a plurality of filling bags provided with an injection port for injecting a liquid solidifying material are provided above and below the foundation of a building. Laminate and arrange in the direction, and arrange an upper rigid plate between the laminate of the filling bag and the foundation, and the inflating action of the laminated filling bag is via the upper rigid plate. An installation step adapted to act on the foundation; and (B) when the foundation is sunk unevenly, at least one of the stacked filling bags has a predetermined liquid state through the inlet. By injecting the solidifying material and inflating the filling bag, the upper rigid plate is pushed upward, and the unevenly settled foundation is raised to a predetermined height via the upper rigid plate. And push like that In an uneven state, the liquid solidified material injected into the filling bag is solidified, and an uneven settlement correction step for correcting uneven settlement, (C) after the uneven settlement correction step, When a non-uniform settlement occurs, a predetermined liquid solidifying material is injected through the injection port into the filling bag in which the liquid solidifying material is not injected / solidified among the stacked filling bags. And a non-uniform subsidence re-correction step of repeatedly correcting the non-uniform subsidence generated after the non-uniform subsidence correction step by solidifying.

  In addition, according to one of the preferred embodiments of the unequal settlement correction method for a building according to the present invention, the laminated body is further provided by disposing a lower rigid plate on the lower surface of the laminated filling bag. A configuration is adopted in which the filling bag is positioned between the upper rigid plate and the lower rigid plate that are opposed to each other in the vertical direction.

  As described above, in the unequal settlement correction method according to the present invention, in the installation process, a plurality of predetermined filling bags are stacked and arranged vertically below the foundation of the building, and In order to place the upper rigid plate between the laminate and the foundation, the holes drilled for the installation of the filling bag and upper rigid plate may be relatively shallow and narrow, and therefore It is not necessary to excavate a hole with a depth of about 1 m that a person can enter like the underpeening method. For this reason, operations such as excavation and backfilling become extremely easy as compared with the underpeening method, and the number of work days and costs are also effectively reduced.

  Further, in the unequal settlement correction method according to the present invention, in the unequal settlement correction step, when the foundation is unevenly subsidized, a predetermined liquid solidification is made through the inlet into the filling bag installed under the foundation. By injecting the material and inflating the filling bag, the upper rigid plate disposed above the filling bag is pushed upward, and the foundation that has been sunk unevenly through the upper rigid plate Is lifted up to a predetermined height, the pushing force by the inflated filling bag is applied to the unevenly settled foundation via the upper rigid plate, and the foundation is reliably pushed up. It is like that. For this reason, it is possible to advantageously prevent an unscheduled place from being lifted or the injected liquid solidified material to flow to a place other than the target place, as in the case of a chemical liquid injection method. The amount of material used can be minimized.

  Furthermore, in this unequal settlement correction process, the liquid solidification material is injected into the filling bag, the foundation is pushed up, and the liquid solidification material is solidified while being pushed up. Even if the bag breaks, the solidified material will not leak and the ground will not sink.

  In addition, in the present invention, since the upper rigid plate is disposed on the laminate of the filling bags, the lifting force by the filling bag is reduced by the upper rigid plate with respect to the unevenly subsidized foundation. So that the foundation is pushed up more horizontally and effectively, and it is possible to advantageously prevent the top side of the laminate of the filling bag from being damaged. It has become.

  In addition, in the present invention, since a plurality of filling bags are stacked vertically below the foundation of the building, the foundation of the unequally settled building is repeatedly corrected several times in one installation operation. It is possible to do that. That is, the non-uniform settlement correction step is performed by injecting a predetermined liquid solidifying material through an inlet into a filling bag that has not been injected or solidified with a liquid solidifying material among the stacked filling bags, and solidifying. It is possible to repeatedly correct unequal settlement that occurred later.

  Therefore, in the unequal settlement correction method for buildings according to the present invention, it is possible to dramatically improve workability and economic efficiency as compared to the conventional underpeening method and chemical injection method, and the unequally sunk buildings The basis of this can be corrected several times.

  Further, according to one of the preferred embodiments of the unequal settlement correction method for buildings according to the present invention, if a lower rigid plate is further provided on the lower surface of the stacked filling bag, the filling is performed when the foundation is pushed up. The occurrence of punching shear under the bag can be advantageously prevented, and the upper rigid plate and the lower rigid plate allow the filling bag to be inflated more uniformly in the vertical direction. .

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 is a perspective view showing an example of a foundation lifting member installed under the foundation in order to push up the foundation of the unequal settlement in the building according to the present invention. It is shown schematically. In FIG. 1, the basic lifting member 10 includes an upper rigid plate 12, three filling bags 14 a, 14 b and 14 c, and a lower rigid plate 16.

  More specifically, the basic lifting member 10 is formed by sequentially stacking three filling bags 14a, 14b, and 14c made of flat, substantially rectangular bags on the upper surface of the rectangular lower rigid plate 16, The rectangular upper rigid plate 12 is further stacked on the filling bags 14a, 14b, and 14c stacked in this manner. In other words, three filling bags 14a, 14b, and 14c are stacked in the vertical direction between the upper rigid plate 12 and the lower rigid plate 16 that are opposed to each other with a predetermined distance in the vertical direction. Arranged in a state.

  And the upper side rigid board 12 and the lower side rigid board 16 are comprised with the steel plate which exhibits a rectangular shape. The upper rigid plate has a length of one side of about 300 to 500 mm and a thickness of about 5 to 10 mm so that it can sufficiently receive the load of the building disposed above. The rigid plate 16 has a length of about 300 to 500 mm and a thickness of about 5 to 10 mm so that the strength of the ground can be reinforced.

  On the other hand, the filling bags 14a, 14b, 14c arranged between the upper rigid plate 12 and the lower rigid plate 16 are all about vertical: about 100 to 500 mm, horizontal: about 100 to 500 mm, and thickness ( (When not filled): Consists of a substantially rectangular bag of about 30 to 50 mm, in an inflatable state, that is, nothing is filled into each of the filling bags 14a, 14b, 14c, and the filling bag Are arranged in a flat state where the upper inner surface and the lower inner surface are in contact with each other.

  In addition, one of the corners of the filling bags 14a, 14b, and 14c includes metal injection pipes 18a, 18b that are in communication with the inside of the filling bags 14a, 14b, and 14c and have a length of about 10 to 300 mm. Each filling bag is integrally provided so as to protrude outward, and the injection pipes 18a, 18b, and 18c are arranged side by side in the vertical direction. 14a, 14b, and 14c are laminated in the same direction. In other words, in FIG. 1, the three filling bags 14a, 14b, and 14c are stacked so that the injection tubes 18a, 18b, and 18c are all located on the right side.

  Here, the material of the filling bags 14a, 14b, and 14c is not particularly limited as long as it has durability and pressure resistance and is inflatable. For example, rubber, synthetic resin, etc. Other examples include fiber reinforced rubber and fiber reinforced resin reinforced with fibers such as Kevlar (R) fiber and carbon fiber. The filling bags 14a, 14b, and 14c are preferably formed so that the expansion in the horizontal direction is small and the expansion in the vertical direction is large, although the expansion form differs depending on the material, the bag manufacturing method, and the like. However, as a commercially available product, a bag used in a mat type air jack (for example, Maxi Force manufactured by PARATECH) can be used.

  And the tip openings of the injection tubes 18a, 18b, 18c fixed to the filling bags 14a, 14b, 14c are injection ports 20a, 20b, 20c for injecting a predetermined liquid solidifying material, As will be described later, a predetermined liquid solidifying material is injected into the filling bags 14a, 14b, and 14c through the injection ports 20a, 20b, and 20c. Although not shown in FIG. 1, a lid (not shown) is attached to the injection ports 20a, 20b, and 20c as necessary, and injected when buried in the ground. It is prevented that soil and water enter the pipes 18a, 18b and 18c and clog the injection pipes 18a, 18b and 18c, and the injection pipes 18a, 18b and 18c have a check valve. The liquid solidifying material can be prevented from flowing back to the outside even if the liquid solidifying material is press-fitted into the filling bags 14a, 14b, and 14c.

  Thus, using the foundation lifting member 10 composed of the rigid plates 12, 16 and the filling bags 14a, 14b, 14c as described above, the step of correcting the unevenly subsidized building according to the construction method according to the present invention. 2 to 7 are shown. Hereinafter, the unequal settlement correction method will be described in detail with reference to FIGS.

-Installation process-
That is, first, as shown in FIG. 2 (a) or (b), the lower rigid plate 16, the filling bags 14a, 14b, 14c, and the upper rigidity are provided on the ground portion located below the foundation 22 of the building. The base pushing-up member 10 is installed under the foundation 22 of the building by sequentially stacking the plates 12 from the bottom upward. As a result, the upper rigid plate 12 is disposed between the laminate of the three flat filling bags 14a, 14b, and 14c and the lower surface of the foundation 22, and the laminate of the filling bags 14a, 14b, and 14c. A thing will be arrange | positioned between the upper side rigid board 12 and the lower side rigid board 16 which were opposingly arranged by the up-down direction. During this installation process, the filling bags 14a, 14b, and 14c are injected into the filling ports 14a, 14b, and 14c through the injection ports 20a, 20b, and 20c so that a predetermined liquid solidifying material can be easily injected. However, it is desirable to install so that it may be located not on the inner side (indoor side) of the building but on the outer side (right side in FIG. 2).

  2A, in the case of new construction, before starting the foundation work, the foundation lifting member 10 is installed in advance in a portion under the foundation 22 of the building such as a house. The process is shown. As described above, when the foundation lifting member 10 is installed prior to the foundation work, the foundation lifting member 10 can be installed using the holes and grooves excavated to form the foundation 22. For this reason, a special excavation work is not required, the installation work can be performed very easily, and since the foundation lifting member 10 is installed in advance, it is not necessary to perform the installation work after uneven subsidence. There is no need to secure a work space. Then, after the foundation lifting member 10 is installed in the excavation hole or the excavation groove, the foundation 22 made of concrete or the like may be provided in accordance with a conventional method so as to be positioned directly above the upper rigid plate 12. is there. At this time, since the upper rigid plate 12 is interposed between the laminate of the filling bags 14a, 14b, and 14c and the foundation 22, the filling bag 14c may be damaged by the foundation work. It is advantageously prevented.

  On the other hand, FIG. 2B shows a process of installing the foundation lifting member 10 under the foundation 22 of the existing building after the building is constructed or after the existing building is sunk unevenly. . In this case, as shown in FIG. 2 (b), the side and lower portions of the foundation 22 are excavated, and the foundation lifting member 10 is installed under the foundation 22 of the building.

  After the foundation lifting member 10 is installed as described above, the foundation lifting member 10 is buried directly under the foundation 22 of the building by refilling the excavated hole or groove as necessary. Become. At this time, since the whole of the foundation pushing-up member 10 is buried in the ground, the foundation pushing member 10 cannot be visually recognized from the ground. For this reason, later, the position of the base lifting member 10, particularly the position of the injection ports 20a, 18b, 18c of the injection pipes 18a, 18b, 18c formed integrally with the filling bags 14a, 14b, 14c is determined. As you can see, it is desirable to mark the ground and blueprints. Thus, in this embodiment, since the lengths of the injection pipes 18a, 18b, and 18c are short and the injection ports 20a, 20b, and 20c do not reach the ground, correction of uneven settlement described later is performed. Although it is sometimes necessary to dig up the ground, damage to the injection pipes 18a, 18b, and 18c can be advantageously prevented as compared with the case where a long injection pipe extending to the ground is employed. .

  By the way, the installation position and the number of installation of the above-mentioned foundation lifting member 10 are, of course, determined as appropriate according to the subsidence location, the degree of subsidence, etc., but are installed in advance before the unequal subsidence occurs. When conducting (including new buildings as well as existing buildings), conduct a ground survey and use the measured ground strength (the force that the ground can withstand the load) The degree of uneven settlement can be predicted and the installation position and number of installations can be determined. In addition, as shown in FIG. 3, the installation position is preferably a corner of the foundation (inner corner and outer corner) or an intersection in the basic plan view, and such corner, corner, or corner. When the foundation extending between the two and the intersection is long, it is desirable that the foundation 22 be installed at intervals of about 1 to 3 m so that the foundation 22 does not bend or break during correction. Further, in addition to the installation position and the number of installations, the number of stacked bags 14 can be appropriately set according to the measured earth strength. It is also possible to increase the number of filling bags 14 and reduce the number of filling bags 14 in a place where the estimated amount of settlement is small.

  The foundation lifting member 10 may be installed in advance under the foundation 22 of the building before the subsidence or after the subsidence. When a building is constructed, the ground sinks over time due to soil compaction or compression, or sinks because there is a high possibility that the ground will sink due to insufficient strength of the ground against the building load. Before, it is desirable to previously install the foundation lifting member 10 as described above.

-Uneven subsidence correction process-
As shown in FIG. 4, when the foundation 22 sinks unevenly (FIG. 4B), the filling bags 14a, 14b, 14c buried under the uneven sinking foundation 22 Here, as shown in FIG. 4C, a predetermined liquid solidifying material 24 is injected into the filling bag 14c. Specifically, first, an arrangement position of the injection port 20c of the injection pipe 18c formed integrally with the filling bag 14c is confirmed by a design drawing or the like, and the ground is dug up to the arrangement position. Next, the lid that closes the injection port 20c is removed, and the connection tube 26 is connected to the injection port 20c of the injection tube 18c. Thereafter, in order to constrain the foundation lifting member 10 with soil, the hole is backfilled until the entire foundation lifting member 10 is hidden. Thereafter, from the ground side, a predetermined liquid solidified material 24 is injected (press-fitted) into the filling bag 14c through the connection tube 26, the injection port 20c, and the injection tube 18c by using a pump 28 or the like. The bag 14c is inflated outward from the inside of the filling bag 14c.

  Accordingly, the upper inner surface and the lower inner surface of the filling bag 14c are mainly separated in the vertical direction, and the filling bag 14c pushes the upper rigid plate 12 upward and pushes the lower rigid plate 16. Although the lower rigid plate 16 is pushed down slightly, it does not lower further due to the reaction force from the ground and the pressure resistance of the lower rigid plate 16 itself, and the inflating action by the filling bag 14c is exerted. The upper rigid plate 12 is caused to act exclusively on the upper rigid plate 12, and as a result, the upper rigid plate 12 is pushed up by the filling bag 14c. For this reason, the foundation 22 which has been sunk unevenly can be effectively raised via the upper rigid plate 12. Then, as shown in FIG. 5, the liquid solidification material 24 is press-fitted into the filling bag 14c until the foundation 22 inclined by the unequal settlement is restored to the original horizontal state, that is, the liquid solidification. The height of the foundation 22 is adjusted by adjusting the injection pressure and the injection amount of the material 24.

  Thus, in this embodiment, since the smooth rigid plates 12 and 16 are disposed above and below the filling bag 14c to be inflated, the filling bag 14c has an irregular shape in the vertical direction. It does not expand and expands substantially uniformly. Further, since the unevenly settled foundation 22 is pushed upward via the upper rigid plate 12, the push-up force by the filling bag 14 c causes the foundation 22 to act substantially uniformly on the surface of the upper rigid plate 12. Therefore, it is possible to prevent the base 22 from acting intensively, that is, to apply a point load to the base 22. For this reason, it is possible to advantageously prevent the foundation 22 that has been sunk unevenly from being pushed up in a state where the foundation 22 is inclined toward the inside or outside of the building (in a state inclined in the left-right direction in FIG. 4). -ing In addition, in the present embodiment, the filling bag 14c is inflated with the foundation lifting member 10 buried in the ground, that is, with the foundation lifting member 10 restrained with soil, The bag 14c is inflated substantially uniformly in the vertical direction. That is, if the filling bag 14c is inflated without backfilling the soil, the filling bag 14c may expand toward the space (hole) in a biased manner. In the present embodiment, at least the basic lifting member 10 is used. Since the soil is backfilled and the liquid solidification material 24 is inflated in the filling bag 14c until it disappears, the filling bag 14c is inflated substantially uniformly.

  Then, after adjusting the height of the foundation 22 as described above, the connection tube 26 is removed from the injection pipe 18c, and the foundation 22 is held in a state where the foundation 22 is pushed up for several hours to several days. The liquid solidified material injected into the solidified material is solidified, the bottom of the foundation 22 is firmly solidified, and uneven settlement is corrected. When the connection tube 26 is removed, a check valve is provided in the injection pipe 18c, so that the liquid solidified material 24 press-fitted into the filling bag 14c leaks to the outside and rises. Is prevented from sinking.

  Here, as the predetermined liquid solidifying material 24, any material can be used as long as it has liquidity or fluidity at the time of injection and can be solidified in the ground without causing much volume change. Examples thereof include cement-based milk, mortar, and water glass.

  If the uneven settlement cannot be sufficiently corrected by simply inflating one filling bag 14c, for example, when the settlement depth is large in the uneven settlement correction process, the second filling is continued. What is necessary is just to inject | pour a liquid solidification material also into the inside of the bag 14b, and to push up the foundation 22. FIG.

  Further, when the gap 30 (see FIG. 5B) is formed between the lower surface of the foundation 22 and the ground or in the ground due to the expansion of the filling bag 14c, the cement 30 A solidifying material such as milk or bubble mortar is poured in accordance with a conventional method so that the space 30 is filled so that the load on the foundation 22 and the building can be received on the entire lower surface of the foundation 22.

-Uneven subsidence recorrection process (1)-
As shown in FIG. 6, after the unequal settlement correction step, when the foundation 22 is sunk again, the filling bags 14 a and 14 b stacked under the unequal settlement foundation 22. 14c, at least one of the filling bags 14a, 14b to which the liquid solidifying material 24 is not yet injected / solidified, except for the filling bag 14c in which the liquid solidifying material 24 is injected / solidified, Then, as shown in FIG. 6C, the unequal subsidence is corrected by injecting and solidifying the liquid solidifying material 24 into the filling bag 14b.

  Specifically, in the above-described unequal settlement correction step, the liquid solidification material 24 is poured into the filling bag 14c and solidified, and is formed integrally with the filling bag 14b in the same manner as when the unequal settlement is corrected. The connection tube 26 is connected to the injection port 20b of the injection tube 18b, and a predetermined liquid solidifying material 24 is injected into the filling bag 14b through the connection tube 26, the injection port 20b, and the injection tube 18b. The filling bag 14b is inflated. As a result, the upper rigid plate 12 and the filling bag 14c are pushed up by the filling bag 14b, and the non-uniformly sunk foundation 22 is raised to a predetermined height via the upper rigid plate 12 and the filling bag 14c. . As a result, the foundation inclined by the uneven settlement is restored to the original horizontal state.

  Thereafter, in the same manner as the above-described unequal settlement correction process, the connection tube 26 is removed from the injection tube 18b, and the foundation 22 is held in a pushed-up state, thereby solidifying the liquid solidified material injected into the filling bag 14b. Furthermore, the unequal subsidence is corrected again by filling the gap formed between the lower surface of the foundation 22 and the ground or in the ground with a solidifying material.

-Uneven subsidence correction process (2)-
After the unequal subsidence re-correction step (1), as shown in FIG. 7, when the foundation 22 inevitably subsides again, the filling bag 14a stacked under the unequal subsidence foundation 22 is obtained. , 14b, 14c, the non-uniform settlement correction process or the non-uniform settlement re-correction process by injecting and solidifying the liquid solidification material 24 into the filling bag 14a into which the liquid solidification material 24 has not been injected / solidified. Similar to (1), unequal settlement is corrected.

  Thus, in the present embodiment, as the basic push-up member 10, a plurality of (three) filling bags acting like a jack are laminated between the rigid plates 12 and 16 are used. Therefore, the uneven settlement can be corrected repeatedly at the same number of times (three times) as the number of installation of the filling bags per installation operation of the foundation lifting member 10. Therefore, although the construction method of this embodiment can be applied to any ground, in particular, the soft ground where uneven settlement occurs over time due to soil compaction, compression, etc., that is, once every several years. It can be applied very advantageously in the ground where it is predicted that it is necessary to repeatedly correct uneven settlement.

  In addition, the foundation 22 can be lifted by a simpler operation compared to the prior art in which a predetermined liquid solidifying material 24 is poured into the filling bag 14 after the foundation lifting member 10 is installed. Compared to the peening method and the like, workability and economic efficiency are dramatically improved. Also, in the step of installing the foundation lifting member 10, it is not necessary to excavate a hole with a depth of about 1 m that a person can enter unlike the underpeening method. Since it is only necessary to excavate to a depth of about ˜50 cm, the workability is greatly improved and the foundation lifting member 10 can be installed even in the ground where the steel pipe pile cannot be driven. . Furthermore, in the present embodiment, the liquid solidifying material 24 is filled into the filling bag 14 disposed under the unevenly subsidized base 22 and the base 22 is raised. In addition, it is possible to prevent unscheduled locations from being lifted or the injected liquid solidified material to flow to locations other than the intended location, and to reduce the amount of liquid solidified material used. Can do.

  Further, in the present embodiment, since the upper rigid plate 12 is arranged on the laminate of the filling bags 14a, 14b, and 14c, the pushing force by the filling bag 14 is applied to the foundation 22 It is made to act effectively on the surface of the upper rigid plate 12, and the foundation is pushed up further horizontally. Further, since the lower rigid plate 16 is disposed under the laminate of the filling bags 14a, 14b, and 14c, even if the ground below the foundation 22 is soft, the lower rigid plate is provided. 16 advantageously prevents punch shear. Moreover, since the laminate of the filling bags 14a, 14b, and 14c is sandwiched between the upper rigid plate 12 and the lower rigid plate 16, the upper and lower surfaces of the laminate are damaged and torn. It is possible to prevent anything.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, three filling bags 14 are laminated. However, the number of laminations of such filling bags 14 is not limited in any way, and the specific number is measured by ground survey. It is determined as appropriate according to the soil strength and the degree of uneven settlement. In this embodiment, the correction of unequal subsidence is repeated three times. However, the number of times is not limited at all, and is appropriately performed according to the unequal subsidence. However, unequal subsidence due to soil compaction, compression, etc. depends largely on geology and building load, but it does not last forever and usually ends in about 5 years, so it is about 2-5 times. It is desirable that the filling bags 14 be stacked so that unequal settlement can be corrected.

  Moreover, in the above example, in order to facilitate understanding of the unequal settlement correction method according to the present invention, the process of raising the foundation 22 using one foundation lifting member 10 is shown. In general, not only from a specific narrow place but from a certain range, usually, each of the filling bags of the foundation lifting member 10 installed in a plurality of places is inflated at the same time to correct uneven settlement. Will be. Needless to say, the expansion amount of the filling bag (filling amount of the liquid solidifying material) is appropriately set according to the amount of settlement at each location.

  Furthermore, in the said embodiment, although the lower side rigid board 16 was arrange | positioned under the bag 14a for filling, when there is no possibility that a punching shear may arise in the ground below the foundation 22, or the foundation 22 When the ground reinforcement below is performed, the foundation 22 can be sufficiently pushed up without the lower rigid plate 16 being installed. Absent. In addition, when performing the said ground reinforcement, it is desirable to perform the cement stabilization process of H (thickness) = 50cm.

  In the above example, the process of pushing up the foundation 22 having an inverted T-shaped cross section has been clarified, but the structure of the foundation is not limited in any way. For example, other floating foundations such as a solid foundation and an independent foundation It is of course possible to push up.

  Furthermore, the overall shape, size, and material of the upper rigid plate, the filling bag, and the lower rigid plate constituting the foundation push-up member 10 are not limited to the illustrated ones, but are durable and pressure resistant. As long as they have the characteristics such as the above, they may have different shapes, sizes, and materials.

  Moreover, in the said embodiment, injection | pouring of the liquid solidification material was sequentially performed from the upper direction (14c) to the downward direction (14a) to the several filling bag stacked | piled up and down. The order of injecting the solidifying material is not limited at all.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is perspective explanatory drawing which shows one Embodiment of the member for foundation raising used in the nonuniform settlement correction method of the building according to this invention. In the unequal settlement correction method of the building according to the present invention, it is a cross-sectional explanatory view showing an example of an installation process for installing the foundation lifting member under the foundation of the building, (a) is installed prior to the foundation work (B) has each shown the process installed under the foundation of the existing building. It is sectional explanatory drawing which shows an example of the unequal subsidence correction process in the unequal subsidence correction construction method of a building according to this invention, Comprising: (a) is the state before unequal subsidence, (b) is after unequal subsidence. (C) is a state after correction of uneven settlement (III (c) -III (c) cross-sectional explanatory view in FIG. 5). Respectively. It is a top view showing the foundation of a building for demonstrating the installation position of the member for foundation raising, Comprising: A shaded part is an installation position of the member for foundation raising. It is sectional explanatory drawing which shows an example of the unequal settlement correction process in the unequal settlement correction method of the building according to this invention, Comprising: (a) is V (a) -V (a) sectional explanatory drawing in FIG. (b) has each shown V (b) -V (b) sectional explanatory drawing in FIG. It is sectional explanatory drawing which shows an example of the 1st non-uniform subsidence recorrection process in the non-uniform subsidence correction construction method of the building according to this invention, Comprising: (a) is the state before re-sinking after correction, (b). Shows the state after re-sinking, and (c) shows the state after re-correction. It is sectional explanatory drawing which shows an example of the 2nd non-uniform subsidence recorrection process in the non-uniform subsidence correction construction method of a building according to this invention, Comprising: (a) is the state before re-subsidence after re-correction, (b) ) Shows the state after re-subsidence, and (c) shows the state after correction again.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Foundation raising member 12 Upper rigid board 14a, 14b, 14c Filling bag 16 Lower rigid board 18a, 18b, 18c Injection pipe 20a, 20b, 20c Inlet 22 Foundation 24 Liquid solidification material 26 Connection tube 28 Pump 30 Cavity

Claims (2)

A plurality of filling bags provided with an inlet for injecting a liquid solidifying material under the foundation of the building are stacked and arranged in the vertical direction, and between the filling bag laminate and the foundation. An installation step in which an upper rigid plate is disposed so that the inflating action of the stacked filling bags can act on the foundation via the upper rigid plate;
When the foundation is unevenly submerged, at least one of the stacked filling bags is injected with a predetermined liquid solidifying material through the inlet, and the filling bag is inflated. The upper rigid plate is pushed upward, the unevenly subsidized foundation is raised to a predetermined height via the upper rigid plate, and in such a pushed state, it is injected into the filling bag. An uneven settlement correction step of solidifying the liquid solidifying material and correcting uneven settlement,
After the unequal settlement correction step, when the unequal settlement of the foundation occurs again, among the stacked filling bags, the filling bag that has not been injected / solidified with the liquid solidifying material. Inequality subsidence recorrection step of repeatedly correcting the unequal subsidence generated after the unequal subsidence correction step by injecting and solidifying a predetermined liquid solidifying material through the inlet,
A method for correcting uneven settlement of buildings characterized by including By arranging a lower rigid plate on the lower surface of the stacked filling bag, the upper filling plate and the lower rigid plate that are arranged so as to face each other in the vertical direction. The method for correcting unequal settlement of buildings according to claim 1, characterized in that it is positioned between the two.

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