JP2006070513A - Height adjusting method of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a height adjusting method of a structure capable of efficiently raising the structure by having little injection amount of a grout. <P>SOLUTION: The height adjusting method of the structure constructed on the ground is made by injecting the grout in the ground. First of all, a plurality of supporting steel pipes 4 are inclined to the inside of a lower part of a plane projection shape of the structure 1 from the circumference of the ground wherein the grout is injected and are penetrated. Then, the grout is injected in a lower layer ground 23 within an injection area virtually surrounded by the supporting steel pipes, and a supporting injection section 31 is formed. After that, the grout is injected in a surface layer ground 21 directly under the structure, and a void injection section 32 is formed. After the grout injected in the lower layer ground and the surface layer ground has been solidified, the pressurized injection of the grout is made to a middle layer ground 22 between a supporting ground and a lifting ground to make lift-up, and the height of the structure is adjusted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for adjusting the height of a structure that is performed when the ground is sunk and the structure is inclined.

When constructing a structure, check the ground strength and supporting ground of the ground to be constructed, and select a foundation structure that will not sink or tilt even if the structure is constructed. However, since the ground strength of the ground may change due to changes in the groundwater level after construction, construction work in adjacent areas, earthquakes, storms and floods, etc., the constructed structure may sink or tilt as a whole. is there. In addition, the ground below the structure is not excavated and visually observed, but is only estimated from drilling data, Swedish sounding test results, or past geological survey results, so there is a softer layer than expected. There is a case where sinking or tilting may occur due to a thick layer or a partially weak layer interposed. In such a case, a work for returning the structure to a predetermined height or correcting the inclination using a jack or the like to return it to the horizontal has been conventionally performed.
Patent Document 1 is a method of adjusting the height of a structure by lifting a foundation of a building in which uneven settlement occurs with a jack and injecting mortar into a gap formed between the bottom surface of the foundation and the ground.
Moreover, patent document 2 is a method of adjusting the height of the structure constructed | assembled on the ground by inject | pouring a liquid material into the lower ground of the unequal-sunk building and pushing up the ground entirely. Patent Document 3 is a method similar to Patent Document 2, in which a side wall is constructed on the outer periphery of the ground for injecting the chemical solution for consolidation, and the building is efficiently raised by preventing the chemical solution from flowing out to the side. is there.
JP 2000-8398 A JP-A-9-13416 Japanese Patent Laid-Open No. 51-103608

The conventional method for adjusting the height of the structure has the following problems.
<1> In the method of jacking up a building, it is necessary to excavate the outside and inside of the building to correct the settlement, and to pierce the steel pipe pile to take the reaction force of the jack. As a result, the construction becomes large and the construction period is prolonged. In addition, since the cause of the settlement is not removed, there is a high possibility that the settlement will occur again.
<2> In the method of Patent Literature 2 in which the chemical solution is gradually injected from the lower layer ground toward the upper layer ground, there is a risk that the building may rise to a building in an adjacent land other than a building that requires height adjustment. In addition, since the injected chemical solution dissipates in all directions, the injection amount increases, and it is difficult to grasp the relationship between the injection amount and the increase amount, and it is difficult to control the increase amount.
<3> A method of surrounding the outer peripheral ground of a building with a side wall is a desirable method for preventing the chemical liquid from flowing out to the side. However, it is possible to build a continuous underground wall in the ground as long as it is the outer circumference of a tank constructed in a wide site on the site as described in Cited Document 3, but the outer circumference of private houses lined up closely It is almost impossible to build a continuous underground wall on the ground.

  In order to solve the above-mentioned problems, the applicant has previously proposed a method for adjusting the height of a structure built on the ground by injecting an injection material into the ground in a depth direction from the structure. A support board injection process for injecting the injection material into the lower layer ground at a separated position, a lift disk injection process for injecting the injection material into at least one surface layer ground directly below or around the structure, the lower layer ground and the A lift-up injection step of adjusting the height of the structure by pressurizing and injecting the injection material into the middle layer ground between the lower layer ground and the surface layer ground after the injection material injected into the surface layer is hardened We have filed a method for adjusting the height of a structure characterized by this.

According to the above invention, at least one of the following effects could be obtained.
<1> After the support injection and the lift board injection, the lift-up injection is finally performed to adjust the height of the structure. For this reason, a structure can be raised effectively with a small injection amount. Moreover, although the period differs depending on the depth of the supporting ground and the size of the structure, the height of the structure could be adjusted in a short period of about 3 to 7 days.
<2> After gap injection into the surface ground, lift-up injection is performed to adjust the height of the structure. For this reason, the injection material is hardly ejected under the ground surface or the structure. In addition, since the injection to raise the structure is performed on the middle ground, the influence of the ground of the adjacent ground rising can be minimized.
<3> When injecting into the ground surrounded by the supporting steel pipe, it is possible to suppress the expansion of the ground to the side and efficiently raise the structure. Moreover, it was possible to suppress the adjacent land from expanding due to the injection.

  In the structure height adjusting method described above, the support steel pipe 4 is inserted into the outer periphery of the ground where the injected material is injected at intervals, so that the lateral bulge of the injected material 53 is injected. Can be suppressed. The ground with suppressed lateral expansion will expand in the vertical direction. Normally, the lower ground is relatively harder than the upper ground, so the ground expands only upward, and as a result, the structure 1 can be efficiently raised.

However, if the lower ground is relatively softer than the upper ground, the ground whose lateral expansion is suppressed when the injection material 53 is injected will expand downward, and the upper ground and the lower ground. There was room for improvement so that the expansion of the ground could be guided as much as possible without being affected by the relative hardness of the ground.

In order to solve the above problems, the height adjustment method of the structure of the present invention is a method of adjusting the height of the structure constructed on the ground by injecting an injection material into the ground, A supporting steel pipe placement step in which the supporting steel pipe is inclined from the outer periphery of the ground into which the injection material is injected toward the lower inner side of the planar projection of the structure, and is virtually surrounded by the supporting steel pipe A support board injection process for injecting injection material into the lower ground in the injection area, a lift disk injection process for injecting injection material into the surface ground immediately below the structure, and injection into the lower ground and the surface ground And a lift-up injection step of adjusting the height of the structure by pressurizing and injecting the injection material into the middle ground between the support plate and the lift plate after the injection material has hardened. It is.
In the structure height adjusting method described above, the head of the supporting steel pipe and the foundation of the structure can be connected to each other. Further, in the above-described method for adjusting the height of the structure, the heads of the supporting steel pipes that are penetrated at intervals can be connected to each other. Further, in the above-described method for adjusting the height of the structure, one support steel pipe is inclined toward the lower inner side of the planar projection of the structure, and the other support steel pipe is vertically penetrated. Only one supporting steel pipe can be inclined and penetrated toward the lower inside of the planar projection type of the structure.

The structure height adjusting method of the present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> After the support injection and the lift board injection, the lift-up injection is finally performed to adjust the height of the structure. For this reason, a structure can be raised effectively with a small injection amount. Further, although the period varies depending on the depth of the supporting ground and the size of the structure, the height of the structure can be adjusted in a short period of about 3 to 7 days.
<2> After gap injection into the surface ground, lift-up injection is performed to adjust the height of the structure. For this reason, the injection material is hardly ejected under the ground surface or the structure. In addition, since the injection for raising the structure is performed on the middle ground, it is possible to minimize the influence of the ground of the adjacent ground rising.
<3> In order to inject into the ground surrounded by the supporting steel pipe that is inclined and penetrated toward the lower inside of the planar projection form of the structure, the supporting steel pipe suppresses the expansion of the ground to the side, The injection pressure increases during the injection process.
<4> Due to the presence of the supporting steel pipe, it acts as a support material as if there is a bottom plate without being affected by the relative hardness of the upper ground and the lower ground, and it is an efficient structure. Can be raised.
<5> The stability of the foundation after construction is improved by connecting the head of the supporting steel pipe and the foundation of the structure to each other after the lift-up of the structure is completed.
<6> The proof stress of the support steel pipe can be increased by connecting the heads of the plurality of support steel pipes penetrating the outer periphery.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Overall Configuration In the method for adjusting the height of the structure 1 of the present invention, first, a plurality of supporting steel pipes 4 are placed to form a virtually enclosed space. This space is used as an implantation region 25 (see FIG. 1). Next, each implantation step is performed in the implantation region 25 to lift up the structure.
Each injection step is performed by changing the injection sequence and the injection pressure according to the depth of the ground. For convenience, the ground that extends in the depth direction below the structure 1 is referred to as a surface ground 21, a middle ground 22, and a lower ground 23 from above (see FIG. 1). The ground with these names cannot be clearly distinguished from where to where is the surface layer ground 21, but is relatively determined by the order of injection as described later.

<2> Supporting Steel Pipe Placing Step A plurality of supporting steel pipes 4 are inclined and penetrated downward from the outer periphery of the ground where injection material is injected (see FIG. 1). ).
The number of penetrations and the surrounding shape of the supporting steel pipe 4 are determined in consideration of the nature of the ground, the influence of the expansion of the ground on the adjacent ground, and the like.
In FIG. 1, it is assumed that the settlement of the structure 1 in the right side surface direction is large, and that the ground on the lower side of the planar projection form of the structure 1 is generally soft, and the structure 1 is viewed from both sides of the structure. The supporting steel pipe 4 is penetrated so as to surround the ground supporting the steel.
By being surrounded by an inverted trapezoidal shape by the supporting steel pipe 4, the ground in the injection region 25 is prevented not only from the side but also from expanding downward at each injection step described below, and the injection pressure of the injection material increases. To do.
Further, the supporting steel pipe 4 does not depend on the relative hardness of the upper ground and the lower ground, and also serves as a supporting material for supporting the lower end of the supporting injection portion 31 as if there is a bottom plate. The structure 1 can be raised more efficiently (see FIG. 2).
In proportion to the number of penetrations of the supporting steel pipe 4, the effect of preventing the expansion of the ground and the effect as a supporting material is increased, and a large number of penetrations are made toward a place where the settlement of the structure is large, that is, a place where lift up is concentrated Thus, a more advantageous effect can be obtained.
Examples of the steel material used as the supporting steel pipe 4 include a single pipe used for a scaffold having a diameter of about 40 to 60 mm. In this case, since the supporting steel pipe 4 has a small cross-sectional area and can be easily penetrated into the ground without using a large pile driving machine, the supporting steel pipe 4 can also be applied to a residential area with a small site.

<3> Injecting Material The injecting material 53 is a known material that can be in a liquid state when injected and penetrates into the ground gap and can solidify after filling to fill the ground gap.
For example, two liquids (A liquid and B liquid) are sent to the head or tip of the injection tube 52 by different routes, and the mixed liquid mixed immediately before the injection is injected into the ground. The mixed liquid gels in a short time of about 5 to 15 seconds and solidifies in the gap of the ground. Such an injection method is a known injection method called a double tube rod method. For example, sodium silicate (water glass) can be used for the liquid A serving as the main agent, and a cement-based material can be used for the liquid B serving as the curing agent.
In addition, depending on the drug used, there is a drug that can secure a gelation time of about 3 to 10 minutes. A single tube rod method, a strainer method, or the like in which injection is performed using the injection tube 52 can be employed.

<4> Supporting board injection process Since the lower layer ground 23 spreads in a wide range in the normal depth direction, the injection is performed in stages. For example, excavation is performed by a boring machine 51, and an injection material 53 is fed into an injection pipe 52 inserted into the ground to perform injection. Injection is usually performed under pressure, but the magnitude of the pressure is adjusted according to the soil soil to be injected, the injection method, the material of the injection material 53, the unit discharge amount, the injection position, and the like. After the injection of a predetermined amount is completed, the injection tube 52 is pulled out by a predetermined length and injection is performed again (see FIG. 5). Then, a columnar improved portion is formed on the ground. A portion formed by injecting the injection material 53 into the lower layer ground 23 is defined as a support injection portion 31 (see FIG. 2).
The upper end of the support injection part 31 does not need to coincide with the upper end of the lower layer ground 23. If the upper end of the support injection part 31 is disposed directly below the foundation 11 of the structure 1 as shown in FIG. It becomes a form which supports the thing 1.
Further, the support injection part 31 is disposed in the lower layer ground 23 of the injection region 25 in the injection region virtually surrounded by the support steel pipe 4 so that the support injection part 31 itself is supported by the support steel pipe 4. Become supported.
The injection of the lower ground 23 can be performed at a predetermined interval in the lateral direction. As a result, a plurality of pile-shaped support injection portions 31 are formed in the ground.
Accordingly, a reaction force that can withstand the pressure generated when the structure 1 is raised is secured. Further, the strength of the lower layer ground 23 itself can be increased so that subsidence does not occur again.
In addition, although the structure 1 may rise also at the time of injection | pouring of this lower layer ground 23, in this invention, final height adjustment of a structure is not performed by injection | pouring of the lower layer ground 23. FIG.

<5> Lift board injection process The base 11 of the structure 1 and the surface ground 21 are not completely in close contact with each other, or are not firmly connected, and there is a gap or a gentle contact. There are many cases. If pressure injection for lifting the structure 1 is performed in this state, the injection material 53 is ejected to the ground surface, or the structure 1 cannot be lifted effectively. For this reason, the injection material 53 is injected into the gap immediately below or around the structure 1 and the injection material 53 injected to raise the structure 1 does not escape upward. 32 is formed. Here, if the foundation 11 of the structure 1 is a plate-shaped solid foundation covering the bottom surface, it may be injected only into the gap around the foundation 11. However, in the case of a belt-like cloth foundation, it is preferable to inject directly under the structure 1.
The injection of the surface layer ground 21 is preferably performed by pouring the injection material 53 into the gap in almost no pressure to the extent that the injection material 53 can be delivered. The formation of the gap injection part 32 is performed in order to suppress the injection of the injection material 53 to the ground, so that the injection is performed while suppressing the pressure so that the injection material 53 does not discharge.
Since the injection into the surface ground 21 is performed to fill the gap between the foundation 11 and the ground, for example, it is preferably performed without any gap in the vicinity of the outer edge of the structure 1 on the side where the settlement is large (see FIG. 3).
Therefore, it is possible to form a lift disk that can be efficiently used for lift-up without the injection material 53 injected to raise the structure 1 being scattered.

<6> Lift-up injecting step First, injecting into the lower layer ground 23 to form a support injecting portion 31 that can secure a reaction force at the time of ascent, and then injecting the surface layer ground 21 to form a lift disc The gap injection part 32 is formed, and the structure 1 is lifted to a predetermined height by finally injecting the intermediate layer ground 22 sandwiched between the lower layer ground 23 and the surface layer ground 21. A portion formed by injection into the middle ground 22 is referred to as a rising injection portion 33 (see FIG. 4).
The injection material 53 injected into the middle ground 22 is blocked by the support injection portion 31 if it is going to diffuse downward, and is blocked by the gap injection portion 32 if it is going to escape upward, the injection material 53 is efficient. It is used to lift the structure 1 to the top.
Therefore, the amount of the injection material 53 used can be reduced as compared with the prior art, which is economical. Moreover, since the structure 1 rises in proportion to the injection amount, the height adjustment can be easily performed because the injection material 53 is less diffused. For example, the injection is performed so that the pressure at the mouth of the injection tube 52 is 100 to 300 kPa. The height adjustment can be performed in units of 1 mm.

<7> Globally controlled injection Globally controlled injection refers to an injection performed after the lift-up injection step D to balance the whole as needed. Since the formation of the ascending injection portion 33 is partially performed aiming at a portion where the subsidence amount is large, when fine adjustment is required over a wide range, adjustment is performed by overall adjustment injection, and the structure 1 is leveled.

<8> Measurement of height Before carrying out the method for adjusting the height of a structure according to the present invention, measurement points are provided at a plurality of positions on the structure 1 and the amount of settlement at each position is measured in advance. . At the time of injection, the height of the measurement point is sequentially measured to adjust the injection amount of the injection material 53.
For example, when the structure 1 is inclined downward to the right, the injection material 53 is injected around the right side of the structure 1, the portion with the largest sinking amount is lifted greatly, and the injection amount is decreased and increased as it moves to the left side. Adjust the amount.
In the method of the present invention, the structure 1 is raised by performing the lift-up injection step D after the support plate injection step B and the lift plate injection step C. For this reason, the result of the injection is efficiently reflected in the rise of the structure 1, and fine adjustment can be easily performed. In particular, when the injection material 53 is injected into the ground blocked by the supporting steel pipe 4, the expansion of the ground in the direction of the supporting steel pipe 4 is prevented, and the ground can be effectively raised.
As described above, according to the structure height adjusting method of the present invention, not only the amount of the injection material 53 used can be reduced, but also the amount of increase can be easily finely adjusted. In particular, the present invention can be easily applied when the foundation of the structure 1 is a direct foundation or a pressure-resistant foundation, and can also be applied to a deep foundation or a cloth foundation made of reinforced concrete.

<9> Supporting steel pipe connection process After the settlement of the structure 1 is corrected by the lift-up process, the support steel pipe 4 and the foundation 11 of the structure 1 are combined to further improve the stability of the foundation after construction. . Further, when a plurality of supporting steel pipes are penetrated, the proof stress of the supporting steel pipes can be increased by connecting them with each other using the supporting steel pipe connecting portions 5 (see FIG. 6).
In addition to the method of connecting the supporting steel pipe, the head of the supporting steel pipe is exposed to the ground, the wall plate 7 is installed along the head connecting direction, and the interior surrounded by the wall plate 7 is cemented or the like Or a method of digging a hole in the ground where the supporting steel pipe is to be placed, exposing the head of the supporting steel pipe from the hole, and refilling with the hardening material 6. Yes (see FIG. 10).

<10> Other Examples As described above, in the supporting steel pipe placing step, the number of penetrations of the supporting steel pipe 4 and the surrounding shape are determined in consideration of the nature of the ground, the influence of the expansion of the ground to the adjacent ground, and the like. decide.
For example, FIG. 7 shows an embodiment of a supporting steel pipe placing process in which lifting is performed from the right side of the structure 1 and the left side of the structure 1 is only intended to prevent expansion of the ground of the adjacent ground. is there. The plurality of support steel pipes 4 on the right side are inclined and penetrated toward the lower inside of the planar projection shape of the structure 1, and the plurality of support steel pipes 4 on the left side are penetrated in the vertical direction.
FIG. 8 shows an embodiment of a supporting steel pipe placing process in which lifting is performed from the right side of the structure 1 and the left side of the structure 1 does not have to consider the expansion of the ground in the adjacent ground. . The plurality of support steel pipes 4 on the right side are inclined and penetrated toward the lower inner side of the planar projection shape of the structure 1, but the support steel pipe 4 may not penetrate the left side.

Explanatory drawing of the steel pipe placing process for a support in the Example of this invention. Explanatory drawing of the support board injection | pouring process in the Example of this invention. Explanatory drawing of the lift disk injection | pouring process in the Example of this invention. Explanatory drawing of the lift-up injection | pouring process in the Example of this invention. Explanatory drawing of the injection | pouring to the lower layer ground in the Example of this invention. Explanatory drawing of the steel pipe connection process for support in the Example of this invention. Explanatory drawing of the other Example in the supporting steel pipe placement process of this invention. Explanatory drawing of the other Example in the supporting steel pipe placement process of this invention. Explanatory drawing of the Example in the steel pipe connection method for support of this invention. Explanatory drawing of the other Example in the steel pipe connection method for support of this invention.

Explanation of symbols

A ... Supporting steel pipe placing process B ... Supporting board injection process C ... Lifting board injection process D ... Lift-up injection process 1 ... Structure 11 ··· Base 21 · · Surface ground 22 .. Middle ground 23 .. Lower ground 24. Support ground 25. Injection region 31. Support injection portion 32. Gap injection portion 33. Ascending injection portion 4. Steel pipe connecting part 51 .. Boring machine 52 .. Injection pipe 53 .. Injection material 6... Hardening material 7.

Claims (5)

A method of adjusting the height of a structure built on the ground by injecting an injection material into the ground,
A supporting steel pipe placing step for inclining and penetrating the supporting steel pipe from the outer periphery of the ground for injecting the injecting material toward the lower inner side of the planar projection type of the structure;
A support plate injection step of injecting an injection material into a lower layer ground in an injection region virtually surrounded by the support steel pipe;
A lift disk injection process for injecting an injection material into the surface ground immediately below the structure;
The lift-up injection step of adjusting the height of the structure by pressurizing and injecting the injection material into the middle layer ground between the support plate and the lift plate after the injection material injected into the lower layer ground and the surface layer ground is hardened And characterized in that
How to adjust the height of the structure.
In the height adjustment method of the structure according to claim 1,
The head of the supporting steel pipe and the foundation of the structure are connected to each other,
How to adjust the height of the structure.
The method for adjusting the height of a structure according to claim 1 or 2,
The heads of a plurality of supporting steel pipes penetrated at intervals are connected to each other,
How to adjust the height of the structure.
In the height adjustment method of the structure according to any one of claims 1 to 3,
One of the supporting steel pipes is inclined and penetrated toward the lower inside of the planar projection form of the structure, and the other supporting steel pipe is penetrated in the vertical direction.
How to adjust the height of the structure.
In the height adjustment method of the structure according to any one of claims 1 to 3,
One supporting steel pipe is inclined and penetrated toward the lower inside of the planar projection of the structure, and the other is not penetrated by the supporting steel pipe,
How to adjust the height of the structure.

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