JPH0960027A - Repair method for uneven settlement of buildings - Google Patents

Abstract

(57) Abstract: The present invention relates to a method for repairing uneven settlement of a building, for repairing a building inclined by ground subsidence at the bottom of a foundation by inserting a bag after the inclination and injecting and expanding a hardening material. An object of the present invention is to provide a method capable of efficiently performing the inclination restoration by the bag regardless of the inclination amount of the building. SOLUTION: A lower frame body having a substantially U-shaped cross section, and an upper side having a substantially U-shaped cross-section attached to the lower frame body so as to be vertically movable along opposite side walls of the lower frame body. In the box-shaped mold consisting of the frame body, attach the bag body to which the injection hose is connected,
After arranging the formwork between the lower surface of the foundation that caused uneven settlement and the ground, inject a hardening material into the bag body through an injection hose to inflate the bag body, and Characterized by pushing up to restore the building horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing uneven settlement of a building.

[0002]

2. Description of the Related Art Underpinning for excavating directly below a sloping foundation and constructing piles, etc., as a method of repairing the unequal settlement of a building when the building has been sloping due to unequal settlement of the foundation ground due to an earthquake Instead of the construction method or the chemical solution injection method of injecting the chemical solution into the lower part of the foundation, a repair method of pushing up the foundation using a fluid has been proposed as disclosed in Japanese Patent Publication No. 7-6208.

In this restoration method, as shown in FIG. 18, a plurality of hardening material-filled bags 7 are arranged in advance between the foundation 3 and the ground 5 of the building 1, and the building 1 is damaged by uneven settlement. When tilted, as shown in FIG. 19, the hardening material 11 is injected into the hardening material filling bag 7 on the subside side by the injection hose 9 to expand the hardening material filling bag 7, thereby pushing up the subside of the building 1 and inclining the building 1. Each of the injection hoses 9 connected to the hardening material-filled bag 7 penetrates the foundation 3 and is drawn into the building 1.

Further, on the lower surface of the base 3, projections 13 are provided in a lattice shape so as to surround the hardening material filled bag 7 from the periphery. Then, the hardening material filling bag 7 filled with the hardening material 11
By constraining the periphery of the with the protrusion 13 and the lower surface of the foundation 3, the shape of the hardening material filling bag 7 is maintained in a fixed shape so that the hardening material filling bag 7 expands in a state of being in close contact with the foundation 3 and the ground 5. Has become.

According to the above-mentioned restoration method, the workability is improved as compared with the conventional underpinning method and the chemical injection method, and the environmental pollution caused by the chemical solution is eliminated.

[0006]

However, even if the protrusions 13 are provided on the base 3 in order to efficiently inflate the hardening material-filled bag 7 as in the above-mentioned restoration method, the amount of inclination of the building 1 due to uneven subsidence. However, depending on the scale of uneven settlement, the building 1 may be inclined more than the height dimension of the protrusion 13 as shown in FIG.

When attempting to repair such a slanted building 1, as shown in FIG. 21, the hardened material filling bag 7 expanded by the hardened material 11 protrudes from between the protrusions 13 and the shape is not maintained in a fixed shape. As a result, it has been pointed out that the inclination cannot be efficiently restored by the hardening material-filled bag 7. The present invention has been devised in view of such an actual situation, and when a building inclined by ground subsidence at the bottom of the foundation is inserted after the bag body is inclined and a hardening material is injected and expanded to restore the building, It is an object of the present invention to provide a method for unequal settlement of a building that can efficiently restore the inclination of the bag regardless of the situation.

[0008]

In order to achieve such an object, a method for repairing uneven settlement of a building according to claim 1 is directed to a lower frame body having a substantially U-shaped cross section and a lower frame body. A bag body to which an injection hose is connected is mounted in a box-shaped mold consisting of an upper frame body having a substantially U-shaped cross-section that is vertically attached to the lower frame body along opposing side walls. Then, after arranging the formwork between the lower surface of the foundation where uneven subsidence has occurred and the ground, the curing material is injected into the bag body through the injection hose to expand the bag body, and The feature is that the frame is pushed up to restore the building horizontally.

The invention according to claim 2 is based on claim 1.
In the uneven settlement method for a building as described, a side plate is vertically movable between side walls of an upper frame and a lower frame, and the formwork is
It is characterized in that the bag body is expanded in a plurality of stages through the side plate by expansion.

[0010]

According to the method for repairing unequal settlement of a building according to claim 1, after arranging the formwork containing the bag between the bottom surface of the foundation having unequal settlement and the ground, a bag is poured from the injection hose. When the curing material is injected into the body to inflate the bag body, the bag body pushes up the building through the upper frame body as the bag body expands, and the building is restored horizontally.

Further, according to the unequal settlement method according to the second aspect, due to the expansion of the bag body, the formwork is extended in a plurality of steps through the side plate to restore the building.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a box-shaped mold used in one embodiment of the method for repairing uneven settlement according to claim 1, wherein the mold 15 has an upper frame 17 and a lower frame 17 each having a substantially U-shaped cross section. The side frame body 19 is formed, and both frame bodies 17 and 19 are firmly formed of iron, reinforced plastic, or the like. Then, on the side walls 17a and 17b of the upper frame body 17, elongated holes 23 are formed in the vertical direction through which the guide stays 21 screwed to the front and rear of the side wall surfaces 19a and 19b of the lower frame body 19 are inserted, as shown in FIG. As shown in FIG. 3, the upper frame 19 is guided by the elongated hole 23 and is vertically attached to the lower frame 17 so as to be vertically movable.

Further, as shown in FIG. 1, lateral flanges 25 are integrally provided in the lower portions of the side walls 19a and 19b of the lower frame body 19 on the ground installation side, respectively.
The length W and width L of the bottom of the base are determined according to the bearing capacity of the foundation lower ground, and the length A of the slot 23 shown in FIG.
Thus, the maximum movement amount (push amount) of the upper frame 19 is set.

Then, as shown in FIG. 4, a bag body 27 which is inflated by the injection of a hardening material (cement paste) is accommodated in the mold frame 17. The bag 27 is formed of fibers or synthetic fibers so that water in the hardened material can be dehydrated to some extent by the injection pressure. Then, as shown in FIG. 5, an injection hose 29 having a closed end on the insertion side is inserted from an insertion port 27a provided in the bag 27, and the insertion port 27a in which the injection hose 29 is inserted is shown in FIG. As described above, the binding band 31 is tightened around the outer circumference of the injection hose 29. Further, as shown in FIG. 5, a plurality of discharge holes 33 for the hardening material G are provided on the peripheral wall of the injection hose 29 inserted into the bag 27, and each discharge hole 33 is inward as shown in FIG. The shape gradually expands from the outside to the outside.

A check valve 35 made of rubber and having a substantially trapezoidal cross section along the inner wall of each discharge hole 33 is formed integrally with the check valve 35 so that the hardening material G can be fed and injected. The check valve 35 is attached to the discharge hole 3 by the injection pressure of the hardening material G as shown in FIG.
3 is opened and the injection of the hardening material G is stopped, the mounting piece 37
The ejection hole 33 is closed by the restoring force of the above. Then, by injecting the curing material G from the injection hose 29 into the bag body 27 and inflating the bag body 27 in this manner, the bag body 27 moves the upper frame body 17 along the elongated hole 23 as shown in FIG. It is designed to push up.

The formwork 15 in this embodiment is constructed in this way, and the uneven settlement method of this embodiment is carried out using this formwork 15 as follows. When a building 41 is constructed on the ground 39 as shown in FIG. 10, when the ground 39 below the foundation 43 is unevenly submerged as shown in FIG. 11 due to an earthquake or the like and the building 41 is inclined, first, as shown in FIG. The ground 39 on the lower side of the foundation 43 side where the uneven settlement has occurred is excavated to form a space 45 sufficient to insert the formwork 15.

Note that due to the uneven settlement of the ground 39, the foundation 4
If there is a gap between the mold 3 and the ground 39 into which the formwork 15 can be inserted, it is not necessary to excavate the ground 39 as described above. Then, as shown in FIGS. 12 and 13, the foundation 43
The formwork 15 accommodating the bag body 27 is arranged in the space 45 between the lower surface of the base and the ground 39. The formwork 15 first connects the injection hose 29 to the contracted bag body 27 on site. After arranging this in the lower frame body 19, the upper frame body 17 is capped on the lower frame body 19, and as shown in FIG.
Are inserted into the long holes 23 provided in the side walls 17a and 17b of the upper frame 17, respectively, and the side walls 19a and 19 of the lower frame 19 are inserted.
It is formed by screwing on b. Then, the mold 15 thus formed may be arranged between the lower surface of the foundation 43 and the ground 39.

Thereafter, a pipe is connected to the injection hose 29 through a valve (not shown), a pressure gauge is attached to a predetermined portion of the pipe, the pressure gauge is monitored, and the opening / closing of the valve is controlled to control the pump. The hardening material G is injected into the bag 27. Thus, when the hardening material G is injected through the injection hose 29, the check valve 35 attached to the injection hose 29.
However, the hardening material G is sequentially injected into the bag body 27, and the bag body 27 is expanded by the injection of the hardening material G.

As shown in FIG. 9, the inflatable bag body 27 is constrained by the upper frame body 17 and the lower frame body 19 of the mold 15 and is held in a fixed shape, so that the upper frame body 17 is held. And the lower frame body 19 are intimately inflated to push up the upper frame body 17 one by one, and as the bag body 27 expands, the upper frame body 17 is pressed against the lower surface of the foundation 43 and the subsidence side of the building 41 is pushed. It will be pushed up to restore the inclination of the building 41. And
It is sufficient to measure based on the base point set in advance, push up the upper frame 17 by the expansion of the bag 27, and stop the injection of the hardening material G when the building 41 is restored horizontally, as described above. Since the bag body 27 is formed of fibers or synthetic fibers so that the water content in the hardening material G can be dehydrated to some extent by the injection pressure, the hardening material G can be promptly kept in a state where the building 41 is kept horizontal. It will solidify.

Even if the hardening material G is once injected into the bag 27, the check valve 35 closes the discharge hole 33 by the restoring force of the mounting piece 37 as shown in FIG. The curing material G in the bag 27 does not flow back into the injection hose 29. Then, after the building 41 is repaired, the injection hose 2
It is only necessary to separate the pipe from the pipe 9, and as the bag 27 expands, a gap 47 is generated between the foundation 43 and the ground 39 as shown in FIG. 14, but this gap 47 is prepared separately. It can be filled by injecting and filling the hardening material from the hose.

As described above, according to this embodiment as well,
As in the conventional example disclosed in Japanese Patent No. 6208, a curing material G
Since the inclination of the building 41 is restored by using, the workability is improved as compared with the underpinning construction method and the chemical solution injection construction method, and there is no fear of environmental pollution due to the chemical solution. By changing the maximum movement amount of the upper frame body 19 in place of the length dimension A of the long hole 23, it is possible to deal with the unequal settlement amount of the building 41. Since the side frame 19 is always kept in a fixed shape, the inclination of the building 41 can be restored by the bag 27 more efficiently than the conventional example of Japanese Patent Publication No. 7-6208.

15 to 17 show claims 1 and 2.
An example of a mold used in the uneven settlement method according to the present invention will be shown.
Also, the upper frame body 51 and the lower frame body 53, which have a substantially U-shaped cross section, are formed into a box shape. However, in the present embodiment, the side walls 51a and 51b of the upper frame body 51 and the lower frame body are further formed. Side plates 55 and 57 are attached between the side walls 53a and 53b of the body 53 so as to be vertically movable via the guide stay 21 and the long hole 23, respectively, and a bag body formed of the same material as the bag body 27 and having a large capacity. 59 is housed in the mold 49, and the bag 59 is expanded by the injected hardening material G to move the mold 49 to the side plate 55,
It is made to extend in two stages via 57.

Since the structure of the injection hose and the like is the same as that of the above-mentioned embodiment, the description thereof will be omitted. Even when the method of the present invention is carried out using such a mold 49, the shape of the bag 59 that expands with the curing material is similar to that of the above-described embodiment.
The shape of the building can be efficiently restored by the bag body 59 while being held in a fixed shape, and the building having a large inclination can be restored by using the form 49.

[0025]

As described above, according to the unequal settlement method for a building according to each claim, a building inclined by ground subsidence at the bottom of the foundation is inserted after the bag body is inclined, and a hardening material is injected, When inflating and repairing, the shape of the bag is always held in a fixed shape by the formwork regardless of the amount of inclination of the building, so the inclination of the building can be efficiently repaired by the bag compared to the conventional method. It became a thing. Further, according to the invention of claim 2, by using the formwork capable of extending in a plurality of stages, it becomes possible to efficiently restore a building having a large inclination.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a formwork used in an embodiment of a method for repairing uneven settlement of a building according to claim 1.

FIG. 2 is a sectional view of a main part of the mold shown in FIG.

FIG. 3 is a side view of the mold shown in FIG.

FIG. 4 is a front view of the mold shown in FIG.

5 is a side view of a bag body to be housed in the mold of FIG. 1. FIG.

FIG. 6 is an enlarged view of a mounting portion of a bag and an injection hose.

FIG. 7 is an enlarged sectional view of a main part of the injection hose.

FIG. 8 is an enlarged sectional view of an essential part of the injection hose showing a state where the check valve opens the discharge hole.

FIG. 9 is a front view of the formwork showing a state where the upper frame body is pushed up by the expanded bag body.

FIG. 10 is a cross-sectional view of a building and foundation constructed on the ground.

FIG. 11 is a cross-sectional view of a sloping building and foundation.

FIG. 12 is a process chart of an embodiment of the uneven settlement method according to claim 1.

FIG. 13 is a front view of a formwork arranged between the lower surface of the foundation and the ground.

FIG. 14 is a process chart of an embodiment of the uneven settlement method according to claim 1.

FIG. 15 is a front view of a mold used in an embodiment of the invention according to claim 1 and claim 2.

16 is a side view of the mold shown in FIG.

17 is a side view of the mold shown in FIG. 15 in an expanded state.

FIG. 18 is a cross-sectional view of a foundation in a conventional uneven settlement method.

FIG. 19 is a process chart of a conventional uneven settlement method.

FIG. 20 is a sectional view of a sloping foundation.

FIG. 21 is a process chart of a conventional uneven settlement method in which the hardening material-filled bag protrudes from the protrusions.

[Explanation of symbols]

 15,49 Formwork 17,51 Upper frame 19,53 Lower frame 21 Guide stay 23 Long hole 27,59 Bag 29 Injection hose 33 Discharge hole 35 Check valve 39 Ground 41 Building 43 Foundation 45 Void 55,57 Side plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Mito 12-20 Ikeda-cho, Nishinomiya-shi, Hyogo Araigumi Co., Ltd. (72) Inventor Hitoshi Tamaki 6-22 Matsugae-cho, Kita-ku, Osaka, Japan Japan Basic Technology Co., Ltd. (72) Inventor Shin Minoh 6-22, Matsugae-cho, Kita-ku, Osaka City, Osaka Prefecture Japan Basic Technology Co., Ltd. (72) Inventor Osamu Torii 6-22, Matsugae-cho, Kita-ku, Osaka City, Osaka Prefecture Japan Basic Technology Co., Ltd.

Claims (2)

[Claims] 1. A lower frame body having a substantially U-shaped cross-section, and a substantially U-shaped cross-section attached to the lower frame body so as to be vertically movable along side walls of the lower frame body facing each other. In the box-shaped mold consisting of the upper frame, attach the bag to which the injection hose is connected,
After arranging the formwork between the lower surface of the foundation that caused uneven settlement and the ground, inject a hardening material into the bag body through an injection hose to inflate the bag body, and A method for unequal settlement of a building, which comprises pushing up to restore the building horizontally. 2. A side plate is vertically movably mounted between the side walls of the upper frame and the lower frame, and the form is expanded in a plurality of stages through the side plate by the expansion of the bag body. Item 1. A method for repairing uneven settlement of a building according to Item 1.