JPH06158670A - Method for constructing foundation of building and the like using aggregate - Google Patents

Abstract

PURPOSE:To reduce the cost of differential settlement correcting work by repeating the work of placing aggregate on a foundation and the ground and crushing it with a power hammer piece and driving it in, thereby forming an aggregate post. CONSTITUTION:Should differential settlement of an existing foundation 1 occur or the possibility of sinking be anticipated, holes 5 are bored in the foundation 1 by a desired number and rubble stones 3 located beneath the foundation are removed. Next, aggregate 6 easy to crush, such as concrete rubble or tile is put in a hollow portion 7 and is hit and crushed using the hitting piece 10 of a power hammer 8. The above work is repeated to driven the aggregate 6 deep into the ground while an aggregate post is formed as necessary. After the aggregate post has begun to work sufficiently as a pile, concrete is poured from the holes 5 and integrated with the rubble stones and the foundation, etc. A tough aggregate post can thus be formed in accordance with the state of the ground and be prevented from sinking over a long period of time and be constructed at low cost while its vibration resisting force can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for preventing the subsidence of a foundation for construction or civil engineering work, and more particularly to a construction method for preventing uneven settlement of a building by improving soft ground.

[0002]

2. Description of the Related Art Conventionally, a so-called concrete pile driving method, in which concrete columns are driven deep into the ground, has been widely used to prevent the settlement of buildings. Further, the foundation of a building such as a general house is often constructed by digging a groove on the ground, laying stones in the groove and pressing the whole, and then simply constructing the formwork foundation with concrete on the stone.

[0003]

However, in the conventional concrete pile driving method, the effect is exerted by the pile reaching the underground rock, but if it does not reach this level and it is halfway, Even if there is a specified design pile capacity at that time, the soil around it pulls the pile downwards over the years, causing the phenomenon that the pile itself pulls down into the ground, causing a long pile (strike). In the case of joint piles, etc., there is a risk of failure, and there is a problem that the danger is greater especially in sludge and sand. Further, since the concrete piles are long and heavy, they require special pile driving machines and cannot be easily handled in narrow spaces, and the construction cost thereof is expensive.

It is known that the factor of differential settlement of general houses often occurs when a building of uneven weight is constructed on a residential land made by cutting mountains in addition to the above soil. However, a foundation simply laid with cobblestone is not sufficient, and there is a disadvantage that the construction is too large to drive the concrete pillars as a countermeasure. Therefore, the present invention, in order to solve the problems of ground subsidence and unprecedented settlement of the building that could not be solved in the past, place an aggregate on the surface or in the ground that requires foundation or ground improvement, and use the aggregate as a power hammer. When burying while crushing with a striking piece provided at the tip of the pressing part of
By supplying new aggregate in sequence onto this aggregate to form aggregate columns that are adapted to the properties of the ground, it is possible to create foundation columns that can prevent settlement with an extremely simple construction method. The purpose is to provide a method of constructing the foundation of a building using timber.

[0005]

In order to achieve the above object, a method of constructing a foundation for a building or the like according to the present invention is such that an aggregate is placed on the foundation or the ground requiring improvement of the foundation, and the aggregate is pressed by a pressing portion of a power hammer. With a striking piece provided at the tip, by hammering while crushing and burying, and by hammering while sequentially supplying new aggregate onto the aggregate, the aggregate forms an aggregate column in the ground, or buckles, Alternatively, it is characterized in that an aggregate support pillar branched into a branch is formed.

[0006]

In the construction method according to the present invention, an aggregate 6 made of a fragile material such as concrete scraps, roof tiles or soft stones is placed on the foundation 2 which requires foundation improvement or ground improvement.
With the striking piece 10 provided at the tip of the pressing portion of the power hammer, the aggregate strut 12 starts to be formed by crushing and hitting and pushing into the ground. Then, by repeatedly driving the aggregate 6 while supplying new aggregate 6 on the aggregate, the aggregate 6 becomes a long aggregate column 12 extending downward in the ground. At this time, the aggregate support column 12 is constantly pressed by the impact piece 10 from above to be directed toward the soft (weak) portion of the ground in the ground, and is bent or branched in the middle. While the aggregate support columns 12 are being generated, the aggregate support columns 12 are successively formed to be strong and tough in a state where crushed pieces, small pieces, and powdery pieces of the crushed aggregate 6 are mixed with each other to add water in the ground, As if the aggregate support columns 12 were such that the roots of trees were stuck in, the aggregate support columns 12 at the ground level
Support stable. Further, as the aggregate pillars 12 are formed, the soil around the pillars 12 can forcibly cause a consolidation phenomenon, and has an effect of keeping out moisture and a minute space of soft ground such as clay and sludge, and in the ground. This is advantageous for improving the ground, such as applying pressure from below to above.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 6 show an example in which a construction method according to the present invention is applied to a foundation of a building, for example, a general house. That is, in FIG. 1, reference numeral 1 denotes a foundation stand on which a standing wall 1a for supporting a house made of concrete and a lateral wall 1b for supporting the house are formed, and the foundation stand 1 has a stone crate 3 in a lateral groove formed by excavating the ground 2. It is built on the paved Kuriishi layer 4. If there is a unequal settlement of the existing building due to the above foundation, or if there is a risk of settlement, the concrete construction method to prevent or correct the settlement at that location is to first attach the foundation pedestal lateral wall 1b to the above-mentioned corresponding location. A desired number of holes 5 are drilled by using a chisel or a drilling device, and the calculus 3 under the holes 5 is removed by exposing the holes 5 or the sides from the holes 5.

Next, as shown in FIG. 2, a predetermined amount of the aggregate 6 is inserted into the hollow portion 7 through the hole 5 and is struck by the power hammer 8 through the hole 5 as described in detail below. Reference numeral 9 is a pressing portion of the power hammer, and a striking piece 10 such as a bishan that easily breaks the aggregate 6 is provided at the tip thereof. The striking piece 10 is such that the aggregate 6 is the size of concrete scrap and does not easily become 6 cm or less, and the lateral escape when the aggregate 6 is struck is minimized, so that the aggregate 6 is about 6 cm square when properly pushed into the ground. Or 36 cm
^{It has} an arbitrary shape of ² . The power hammer 8 is a hand-held type and has an instantaneous striking force of 3 in the construction as in the case of the embodiment.
Using a rammer or vibration of about 5 tons, the striking piece 10 has the above-mentioned size. It should be noted that the aggregate 6 is made of concrete waste, roof tile, brick, soft rubble stone, etc., and is easily broken when hit into the ground and hardened. Also, the hole 5 drilled in the base 1 has a diameter of 10
If the shape is about cm, and the shape expands downward,
It is easy to hit the aggregate 6 and the supporting effect of the foundation can be improved.

FIG. 3 shows an initial state in which the aggregate 6 is struck. The initial stage of the aggregate 6 crushed is difficult to break because the surface of the ground 2 is soft (especially remarkable in sludge or clay embankment). When the hitting piece 10 penetrates downward, the aggregate 6 that is not broken escapes beside the hitting piece 10, and the crushed aggregate 6 is pressed just below the hitting piece 10 to form a pillar-shaped mass of the aggregate. The arrow A shows a state where the uncrushed aggregate 6 escapes laterally in the ground, and the arrow B shows a state where it escapes laterally in the hollow 7.

In FIG. 4, the strut-like mass of the aggregate 6 is inserted together with the striking piece 10 by forming a hole groove 11 into the ground so that the striking piece 10 can be sucked in by further continuing the striking from the above state. Become. (The diameter of the pillar-shaped mass at this time was about 10 cm.)

In FIG. 5, the pressing portion 9 of the power hammer 8 and the striking piece 10 are pulled out from the hole 5, and a new aggregate 6 is inserted into the hole 5.
After the ball is thrown in and supplied, the hammering piece 10 is again inserted and the hammering is started, and a new crushed aggregate 6 is hammered and pressed on the pillar-shaped mass in FIG. 3 described above. The aggregate pillars 12 are formed while penetrating deep into the ground. The action of the aggregate pillar 12 in the ground is the mode of FIG. 7 described later, and when the pillar 6 is formed in the ground while the aggregate 6 is being hit and pressed, pressing the soil and stone around it, The material columns 12 are supported in various states in the ground in an extremely stable and strong state.

At this time, a large lump of aggregate that has not been crushed but has entered the hole groove 11 is laterally moved while sequentially rotating when it is hit and pressed to form a strong wall surface of the hole groove 11. Further, a part of the crushed aggregate fragments is firmly pressed and attached to the wall surface of the hole groove, which contributes to the formation of a stronger aggregate column 12. It is important to repeat the supply of the aggregate 6 and the repeated hitting and pressing by the required length and shape of the pillar 12 depending on the property of the regional ground 2, the degree of correction of the building, the strength, and the like. As a tentative guide, as the aggregate 6 is supplied, the strut 12 is judged to have been sufficiently formed when the striking force of the striking piece 10 is balanced and the hole groove 11 is no longer formed. Just finish the work. (In addition, in the construction experiment of the soft ground like sludge, when a rammer with a striking force of 5 tons was used and the aggregate was supplied 10 times and hammered in, the strut length was 4 to 8 m.)

The number of columns is determined by the required length and shape of the columns 12 depending on the properties of the regional ground 2, the degree of correction of the building, the strength, etc. When a plurality of columns are adjacent to each other, the soil (sludge) consolidation phenomenon occurs. Therefore, the supporting range of the pillar pile is very large and a synergistic effect can be produced. Therefore, it is more preferable to perform the construction on the entire area of the foundation table 1. In the existing foundation table, if the holes 5 are formed in the lateral wall b at a predetermined interval and the driving is performed by the number enough to withstand the correction of the portion, the above-mentioned construction is performed. It can be performed easily and inexpensively.

The foundation thus constructed is finished in a better condition by finishing the work as shown in FIG. 6, and it is possible to use the building for a long period of time without anxiety. That is, when the aggregate columns 12 are formed in a desired state and a sufficient pile action is achieved, the concrete columns 13 are passed through the holes 5
Then, the aggregate columns 12, the cobblestone layer 4, and the foundation stand 1 are solidified together. 14 is a reinforcing bar. Further, if it is desired to jack up the base 1 before pouring the concrete 13, the aggregate columns are optimally used as an abutment, and the structure can be accurately and easily corrected.

An example of the operation of forming the aggregate columns will be described with reference to FIG. The (A), (B),
Each of (C), (D), (E), and (F) is a state diagram of generation of an aggregate strut formed by hammering the aggregate into the ground. When it is beaten while being crushed at 10, it tries to extend downward as one straight aggregate column as shown in the figure at the initial stage. However, in the ground part soft ground 20 on the right side and solid ground 21 on the left side
Is present, the aggregate support columns 12 are directed toward the soft ground 20, and as a result, the bending of the aggregate supports 2 in the middle is
It will be formed in two columns. From this state, one mode of formation of the support columns when the aggregate 6 is continuously beaten is as follows. B shows a state in which stress concentrates on the bend 22 and causes buckling, and C shows an aggregate column extending in a branch shape from the buckling point 23 toward the soft ground 20 side. The state where the 1st branch support 24 is formed is shown. At this time, the extension of the lower end of the main column 12 is small or stopped.

In this way, when the first branch of the aggregate strut 12 is sufficiently stretched to withstand this, as shown in Fig. D, it buckles toward the next weaker ground, or the second branch strut 25 is produced. It dives into the soft part of the ground and extends in the direction of escape. Fig. E shows a state in which each strut is generated together, and when this eventually grows in a well-balanced manner and the striking force of the power hammer makes it impossible to drive the aggregate 6 further, as shown in Fig. F, the aggregate strut 12 is formed with the above-mentioned branch support in the ground as a foundation support in an extremely strong and stable state as if the tree had roots. The branch strut can be further idealized by using a heavy machine of a power traveling type having a larger instantaneous striking force, and the striking piece 10 can be made to have a size corresponding to this, so that the strut can be thick. It is large and can be easily constructed deep in the ground, and can improve large-scale construction and civil engineering foundation works.

Next, referring to FIG. 8 and FIG. 9, a case in which it is difficult to generate an aggregate column even if the aggregate is hit with the striking piece 10 as a result of the above-described experiment will be described for reference. Fig. 8 shows that when the aggregate is sand, wet quarry powder or abnormally hard quarry stone, the aggregate is not crushed by the impact of the impact piece, and it only rotates in the shape of an arrow bag around the impact piece to reach the ground. Indicates that it is difficult to enter.

FIG. 9 shows an example in which a hard aggregate is widely tamped. In this case, since the area where the stress against the impact of the impact piece 10 is generated becomes large, no aggregate strut is formed even if the impact is applied. It became a result.

FIGS. 10 and 11 show an embodiment in which a cylindrical guide is installed at a portion which becomes an entrance of the hole groove 11 for driving the aggregate 6, and in this case, in particular, the heavy equipment mentioned above. It is suitable for use with a power hammer (not shown). In FIG. 10, reference numeral 30 denotes a tubular guide which inserts a predetermined depth into the surface of the ground and supplies the aggregate 6 into the interior for driving. Reference numeral 31 is a brim integrally formed of concrete with the guide 30 and can prevent the guide from being reinforced and moving downward. By doing so, the initial supply and driving of the aggregate 6 can be performed more satisfactorily, a thicker and longer aggregate column can be formed, the work efficiency is improved, and the guide 30 itself is utilized as a solid foundation tool. There is an effect that can be.

FIG. 11 shows an iron guide 30 provided with a supply port 32 for the aggregate 6, and the striking piece 10 is inserted through an opening 33 above it to drive the aggregate 6 from within the guide 30. By adjusting the continuous supply of the aggregate 6 and the hitting timing of the hitting piece 10, it is possible to automate the operation of forming the aggregate column. In this case, the striking piece 10 is preferably provided with a notch 34 for supply through which a part of the aggregate 6 passes. When the work of forming the aggregate columns in this portion is completed, the guide 30 can be moved to another portion to perform the foundation building work with the aggregate again.

[0021]

As described above, according to the method of the present invention, as a basic pillar for this type of construction, the aggregate is crushed by the striking piece provided at the tip of the pressing portion of the power hammer, and new aggregates are successively added. Since it is driven into the ground while supplying concretely to generate aggregate columns, the aggregate columns are bent and branched in accordance with the state of the ground to form a solid and tough aggregate column. Since it can be done, the aggregate that is hammered in will eventually support the ground surface that has been hammered in with the root firmly attached below the ground surface, and can also suppress the lateral flow of soft ground, especially clay and sludge fluid ground as much as possible. . Therefore, it is possible to maintain stable for a long period of time while preventing subsidence or differential subsidence of the building constructed on the aggregate pillar. In addition, it has a large anti-vibration force and is safe even in the event of an earthquake. Furthermore, in the correction work for uneven settlement of the existing building, it is possible to very easily correct the part and improve the ground, and it is possible to accomplish the work at low cost and easily. In addition, since it is possible to reuse primary products and concrete scraps without constructing long concrete pillars in constructing the foundation pillars, it is possible to reduce the overall construction cost and transport the aggregates. It is easy to carry out, and it is possible to easily carry out work that can be done safely in places where it is difficult to do with concrete pillars without large investment. The reference numerals are for reference to the drawings and do not limit the configuration in any way.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view showing an existing concrete foundation part on which a method of the present invention is to be carried out.

FIG. 2 is a diagram showing a state in which an aggregate is put into the ground beneath the stones through the holes in the above figure.

FIG. 3 is a state diagram of an initial stage of hammering the aggregate with a hitting piece in the above figure.

FIG. 4 is a diagram showing a state in which the tapping is further performed in the above figure.

FIG. 5 is a state diagram in which new aggregate is supplied and hammered in again in the above figure.

FIG. 6 is a state diagram in the case of completing the tapping and reinforcing the foundation in the above figure.

FIG. 7 is an explanatory view showing a state of underground driven aggregate by the method of the present invention.

FIG. 8 is a reference explanatory view when the aggregate is hard and cannot be broken.

FIG. 9 is a reference diagram showing a state of an aggregate.

FIG. 10 is another embodiment using a concrete guide.

FIG. 11 is another embodiment using a guide with a supply port.

[Explanation of symbols]

 1 Foundation 2 Ground 3 Kuriishi 5 Holes 6 Aggregate 8 Power Hammer 10 Hitting Piece 12 Aggregate Strut

Claims (3)

[Claims] 1. An aggregate (6) is placed on a foundation or a ground (2) requiring ground improvement, and the aggregate (6) is crushed by a striking piece (10) provided at the tip of a pressing portion of a power hammer (8). While striking while burying, the aggregate (6) forms aggregate columns (12) in the ground by hammering while feeding new aggregate (6) onto the aggregate (6) in sequence, or A method for constructing a foundation for a building or the like made of aggregate, characterized in that an aggregate column (12) that is buckled or branched is formed. 2. The aggregate (6) is a material which is easily broken by the impact force of a power hammer (8) (for example, concrete scraps, roof tiles,
The method for constructing a foundation for a building using aggregate as claimed in claim 1, which is a brick, a stone, etc. 3. The striking piece (10) is a hand-held power hammer (8) having a polygonal or circular striking surface.
A method for constructing a foundation for a building using the aggregate described.