JPH0329947B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction method for correcting uneven settlement or uniform settlement of buildings such as houses, offices, warehouses, etc.

[Prior Art] In recent years, ground subsidence has been occurring frequently, especially due to groundwater draining caused by sewerage construction, subway construction, public ditch construction, etc., and as a result, houses and offices built on top of the subsidence have become more frequent. These structures have become a major social problem due to uneven settlement (the building leans) or equal settlement (the entire structure sinks as it is).

As a construction method to correct the subsidence of buildings due to such ground subsidence, the rail construction method has traditionally been used (more than 90% of the time). This is done by drilling multiple holes in the foundation of the building from the front, back, left and right, inserting rails into these holes and jacking up the building to raise the entire building horizontally (about 1 to 1.5 meters), and then to the area where the ground has sunk. This is a construction method in which the earth is piled up, the foundation is poured, and the structure is lowered on top of it.

[Problems to be solved by the invention] The above-mentioned rail construction method has the following problems, and in order to deal with the problem of building subsidence, which is expected to increase in the future, a new construction method that eliminates these problems has been proposed. Establishment was long awaited.

(1) Since people are working under a structure that has been jacked up about 1 to 1.5 meters, not only is it not possible to carry out sufficient construction work, but there is always danger.

(2) Structures under construction are unstable;
No one can live in the area during construction.

(3) Since long rails must be inserted into the foundation of the building from the front, back, left and right, construction is not possible in areas with a high concentration of houses.

(4) Simply placing earth on the subsidence of the ground will not
It is difficult to make the ground support the load of the building, and as a result, the embankment often sinks again several years later, causing the building to sink again.

(5) Holes are drilled to insert the foundation rails, and these holes are covered with concrete after the construction is completed, but the old concrete and new concrete are not integrated, making them susceptible to dynamic pressure.

(6) The construction period is long (usually 30 to 60 days) and construction costs are high.

The present invention was made in order to solve the problems of the conventional construction method as described above, and it is possible to carry out the construction in a short period of time and at low cost, without using rails, etc., while people are still living in the house. The purpose of this project is to realize a method for correcting subsidence of buildings without the risk of subsidence again.

[Means for Solving the Problems] In order to achieve the above object, the method for repairing a sunken building according to the present invention is a construction method for repairing a building that has unevenly settled or evenly settled. The sides of the foundation are cut down and crushed stones are poured in, and a first base made of concrete with an approximately 45° slope on the foundation side is poured on top of it, and between the first base and the foundation. A plurality of first jacks are arranged at an angle at appropriate intervals to jack up and support the foundation, and in this state, second jacks are arranged upright under the foundation at appropriate intervals to jack it up. When the second jack sinks due to this, take out the second jack, then put in the broken chestnut stone, place the second jack again and jack it up, and repeat this operation to remove the broken chestnut stone. is press-fitted, and when the pressure is restored to the ground, the second
The second jack made of concrete blocks
The structure is supported by replacing the base with the first jack removed, and the first and second jacks are replaced with the base.
This method is characterized in that after concrete is placed on the base, the cut-off area is backfilled.

[Embodiments of the Invention] Figure 1 is a plan view showing an example of the foundation of a building on which the construction method according to the invention is constructed, and the building is located along the horizontal line L-
It sinks unevenly by θ° with respect to L. Examples of construction methods for correcting uneven settlement of buildings are as follows.

(1) Demolish and remove structures such as the concrete tataki 3 and part of the block wall around the outer periphery of the foundation 1.

(2) As shown in Figure 2, cut the roots 4 on the side of the foundation 1 and carry out the excavated soil. In this case, depending on the subsidence of the structure, only the area necessary for construction may be cut.

(3) The bottom part 5 of the root cutting 4 is compacted according to the load of the structure, and a cracked stone 6 is thrown in to close the area. degree).

(4) As shown in Figure 3, reinforcing bars 7 are placed on top of the split stone 6.
are assembled, a temporary frame is applied, and the first base 8 is concreted with a size corresponding to the load of the structure and has an approximately 45° slope on the foundation 1 side (in the example, the first base 8 Width (W): 50cm,
Height (h ₁ ): 30 cm, height (h ₂ ): 15 cm, length taken as root cutting range).

(5) Between the slope of the first base 8 and the foundation 1 of the building, a plurality of first hydraulic jacks 9 are arranged at an angle perpendicular to the plane of the drawing (the intervals between the hydraulic jacks 9 are as follows: Usually about 90 if the building is made of wood.
cm, approximately 30 cm for reinforced concrete).

(6) The foundation 1 is jacked up by the first hydraulic jack 9, the structure is returned to the horizontal position, and the first base 8 takes up the reaction force.

(7) In this state, as shown in FIG. 4, a plurality of second hydraulic jacks 10 are placed upright under the footing 2 of the foundation 1 in a direction perpendicular to the plane of the figure. The spacing between the second hydraulic jacks 10 is approximately the same as the spacing between the first hydraulic jacks 9.

(8) Next, jack up each second hydraulic jack 10. In this case, since there is usually no reaction force in the ground, each second hydraulic jack 10 sinks into the ground due to the reaction force of the foundation 1.

Therefore, the second hydraulic jack 10 is taken out and the cracked stone 11 is thrown into the hole created by the subsidence of the ground, and the second hydraulic jack 10 is again placed on top of the broken chestnut stone 11 to jack up the broken chestnut stone. 1
1 into the ground.

By repeating this operation, the split stones 11 escape to the weaker parts of the ground below and around them, and mix with the split stones 11 thrown under the second hydraulic jack 10 adjacent in the direction perpendicular to the plane of the figure.

(9) When the reaction force from the cracked stone 11 begins to appear, remove the second hydraulic jack 10, and sprinkle dry cement on the split stone 11 that has been press-fitted into the ground, or sprinkle the split stone mixed with dry cement. 1
1, then insert the second hydraulic jack 10 onto the cracked stone 11 again to jack it up, and press the cracked stone 11 mixed with mixed cement into the ground (from this, the mixed cement will absorb moisture in the ground). (It will solidify naturally).

During this time, the building is supported by the first hydraulic jack 9, or by the second hydraulic jack 10.
When the building is about to be jacked up, the building is stopped at that position, and the building is always supported horizontally by the first hydraulic jack 9.

(10) When it is determined that the reaction force has been recovered by press-fitting the split stone 11, that is, when a reaction force is generated in the ground and a force is generated to repel the load of the structure, the first hydraulic jack 9 is used to lift the structure. The second hydraulic jack 10 is removed while supporting the structure, and a second base 12 such as a concrete block is installed between the footing 2 and the split stone 11 to support the structure, as shown in FIG. Remove the hydraulic jack 9 of 1. As a result, the building is supported horizontally by the second base 12 on the ground into which the split stones 11 are press-fitted.

Note that one or two of the second hydraulic jacks 10 are left in place without removing them completely, and changes in reaction force are investigated over time.If the reaction force decreases,
The split stone 11 is again moved by the second hydraulic jack 10.
may be press-fitted.

(11) Insert the cracked stone 14 for the second base 12 and close the eyes.

(12) Assemble and process the reinforcing bars 15 for the second base 12,
A temporary frame is provided and concrete 13 is poured around the second base 12.

(13) Backfill and compact the cut area 4 and dispose of the remaining soil.

(14) As shown in Figure 6, the reinforcing bars 17 for the Inubashiri 16 are assembled, a temporary frame is provided, and concrete is poured.

(15) Repair the damaged parts caused by the erection of the building and the building.

This completes the correction of uneven settlement of the structure.

Although an example of the construction method according to the present invention has been described above, some of the above steps may be omitted or changed depending on the subsidence of the building, the ground condition, the surrounding situation, etc. Further, it goes without saying that the contents of each construction work are not limited to the above-mentioned embodiments, and can be changed as appropriate without departing from the gist of the present invention.

[Effects of the Invention] As is clear from the above description, the present invention provides the following remarkable effects compared to conventional construction methods.

(1) When carrying out construction work, there is almost no need for people to go under the structure, and work can be done outside the foundation, making the work easier and safer.

(2) Since only a portion of the structure is jacked up and returned to level, the structure remains stable during construction, and construction can be carried out while people are still living there.

(3) Since there is no need to insert long rails, construction work can be carried out even in areas with a high density of houses.

(4) Sprung stones are press-fitted under the foundation until the reaction force is completely recovered, so the ground becomes strong and there is no risk of re-sinking even after a long period of time.

(5) It is resistant to dynamic pressure because it does not drill holes in the foundation.

(6) Construction will have little impact on each part of the building.

(7) It is extremely economical as it costs 1/2 to 1/3 of the cost of conventional construction methods.

(8) Conventional rail construction methods usually require a construction period of 30 to 60 days, but according to the construction method of the present invention, the construction period can be significantly shortened to 10 to 20 days.

[Brief explanation of drawings]

Figure 1 is a plan view showing an example of the foundation of a building with uneven settlement for explaining the construction method according to the present invention, and Figures 2 to 6 are explanatory diagrams showing an example of the construction order of the construction method according to the present invention. be. 1: Foundation, 4: Root felling, 6, 11, 14: Split stone, 8: First base, 9, 10: Hydraulic jack,
12: Concrete block, 13: Base.

Claims (1)

[Claims] 1. In the method of repairing a building that has settled unevenly or evenly, the side of the foundation of the building that requires correction is cut down, split stones are poured in, and then concrete is placed on top of it to form a slope of approximately 45° toward the foundation. A plurality of first jacks are arranged at an angle at appropriate intervals between the first base and the foundation to jack up and support the foundation, and in this state, Second jacks were placed upright under the foundation at appropriate intervals and jacked up, and when the second jacks sank, the second jacks were taken out and cracked stones were thrown in afterwards. After that, the second jack is placed and jacked up again, and this operation is repeated to press in the split stone. When the reaction force is restored in the ground, the second jack is replaced with a second base made of concrete block. A method for repairing a submerged building, characterized in that the first jack is removed, concrete is placed on the first base and the second base, and the cut is backfilled.