JP7082515B2 - Durable block press-fit foundation construction method for foundation repair - Google Patents

Description

The present invention relates to a house foundation construction method by a press-fitting method using a jack when repairing a foundation of a sloping house. More specifically, the present invention relates to a method of constructing a block foundation pile as a house foundation by jack-up press fitting of a durable block.

When repairing the foundation of a sloping house, there is a jack-up house foundation construction method in which a hydraulic jack is interposed between the foundation and the house and the foundation material can be submerged by using the load of the house. For example, "a jack-up press-fitting method for steel pipe piles by using a jack", a plurality of steel pipe piles are sequentially press-fitted, and upper and lower steel pipe piles are connected to form one foundation pile.

JP 2007-169988

Patent Document 1 (Title of the invention: press-fitting method of support pile and loading test method) describes connecting upper and lower steel pipe piles to form one foundation pile A'.
As shown in FIG. 10 , the single pipe 101 is inserted into the connecting portion of the steel pipe pile 100, and the upper end of the single pipe 101 and the inner surface of the steel pipe pile 100 are welded W to integrate the upper and lower steel pipe piles.
That is, welding work is required on the inner surface side of the steel pipe pile. In the welding work on the inner surface side of the steel pipe pile, it is difficult to completely weld over the entire peripheral surface, and it is difficult to completely confirm the welded state.
In order to solve the above problem, is it possible to integrate the upper and lower steel pipe piles by inserting a single pipe outside the connecting part of the steel pipe pile and welding the upper end of the single pipe to the outer surface of the steel pipe pile? There is a problem that the integration of the connecting portion of the steel pipe pile becomes insufficient, and the connecting portion bends at the time of press fitting due to the presence of an obstacle, and the straightness of the foundation pile deteriorates.

An object of the present invention is to eliminate the need for welding work on a connecting portion in order to solve the above-mentioned problems of steel pipe piles.
Further, it is an object to use a general-purpose durable block as a basic material.

The invention of the present application is
Durable blocks with a central through hole and a filling groove are stacked, reinforcing bars are inserted into the central through hole to form a block foundation pile, and
Install a hydraulic jack between the durable block and the bottom of the building foundation,
By operating the hydraulic jack, the durable block is press-fitted using the reaction force of the weight of the house building to complete the press-fitting process of the first block.
Place the second durable block on the upper surface of the first durable block, insert the reinforcing bar into the central through hole of the first durable block and the central through hole of the second durable block, and rebar 2 The lower half is exposed below the 1st stage durable block, and the upper half of the reinforcing bar 2 is located in the central through hole of the 2nd stage durable block, so that the 1st stage durable block and the 2nd stage durable block are located. And interconnected ,
Cement milk is filled in the space formed between the filling groove of the first-stage durable block and the bottom surface of the second-stage durable block, and the first-stage durable block and the second-stage durable block are mutually exchanged. After fixing and completing the fixing process with the 1st stage durable block and the 1st stage durable block ,
Proceed to the press-fitting process of the second block,
After that, the durable block press-fitting foundation for foundation repair is characterized by continuing the process until the number of stages for completing the block pile with the predetermined load is reached by continuing this process. Providing a construction method.

The present invention is a method of constructing a foundation of a house by a press-fitting method using a jack for repairing the foundation of a sloping house, which eliminates the need for welding work and uses a general-purpose durable block as a foundation material. It has the effect of facilitating procurement and preparation and reducing construction costs.

The schematic diagram which shows the construction example of the durable block foundation pile construction method of this invention. Perspective view of the durable block. The schematic diagram which shows the working process of the durable block foundation pile construction method of this invention. An explanatory view of excavation work showing a durable block press-fitting construction procedure according to the present invention. Similarly, an explanatory diagram of a block pile with a predetermined load. Similarly, an explanatory diagram showing the completion of the jack-up work for foundation repair. Similarly, an explanatory diagram showing the injection of cement milk. Similarly, an explanatory diagram showing spacer installation. Similarly, an explanatory diagram showing backfilling and filling injection. The schematic diagram which shows the construction example of the known steel pipe pile construction method.

Preferred Embodiment of the invention

In the durable block foundation pile of the present invention, referring to FIG. 1, durable blocks 1 having a central through hole (reinforcing bar insertion hole) 11 are stacked, and reinforcing bars 2 are inserted into the through holes 11 to vertically adjacent durable blocks. The block foundation pile A is completed by forming a single durable block in the vertical direction with the number of steps for completing a block pile with a predetermined load by connecting and integrating the two.
In the example, the durable block 1 was a square plane of 200 mm × 200 mm with a height of 150 mm, and a filling groove 12 was formed on the surface of the durable block 1, referring to FIG.
As for the reinforcing bar 2, the standard length is 150 mm with a deformed reinforcing bar with a diameter of 16 mm.

Next, with reference to FIG. 3, the work process up to the completion of the durable block foundation pile A of the present invention will be described.
B. Form work space 3.
B. Install the first-stage durable block 1 in the work space 3.
C. Install a hydraulic jack 4 between the first-stage durable block 1 and the bottom of the house foundation 9.
2. By operating the hydraulic jack 4, the durable block is press-fitted using the reaction force of the house's own weight. Place the second durable block on the upper surface of the first durable block, insert reinforcing bars into the central through hole of the first durable block and the central through hole of the second durable block, and insert the reinforcing bars into the first through hole. After connecting the endurance block of No. 1 and the endurance block of the second stage to each other
Reinforcing bar 2 is inserted into the through hole 11 of the first block. The lower half of the reinforcing bar 2 is exposed below the block. --- Completed the press-fitting process of the 1st block ----
E. Install a second-stage hydraulic jack, insert the reinforcing bar 2 into the central through hole 11, fill the filling groove 12 with cement milk , and connect the first -stage block 1 and the second-stage block 1. ..
After that, by continuing this process, the press-fitting of the durable blocks with the number of stages to be the block pile A with the predetermined load is completed.
Cement milk is injected into the gap around the block pile and the filling groove 12, and the circumference of the block pile is surrounded by cement milk, and the plurality of durable blocks 1 and the plurality of reinforcing bars are mutually fixed and integrated to be predetermined. Complete the load block pile A.

In addition, with reference to FIGS. 4 to 9, an example of the construction procedure will be described with respect to the foundation repair to which the durable block press-fit type foundation pile construction method of the present invention is applied.
Excavation (Fig. 4)
When jacking up a house, in order to press-fit the durable block and secure the work space, the ground directly under the foundation of the house is excavated in a square shape to secure the work space 3.

b. Durable block press-fitting (formation of durable block piles by implementing the present invention) (Fig. 5)
A hydraulic jack 4 is installed on the upper part of the durable block, and the head of the hydraulic jack 4 acts on the bottom surface of the building 10 building foundation.
The durable block is press-fitted with a hydraulic jack using the reaction force of the house's own weight.
The press-fitting of the first-stage durable block is completed.
Insert the connecting reinforcing bar 2 into the through hole 10 to which the next durable block 1 is attached, and connect the upper and lower durable blocks to each other.
After that, this process is continued until the durable block piles made by laminating durable blocks reach the support board layer 20.

c. Jack up (Fig. 6)
After the press-fitting of the durable block is completed, hydraulic jacks 4a will be installed at all jack-up work points and the correction of the inclination of the house will be started.
While constantly monitoring the abnormalities of the foundation concrete, outer walls, etc., and changes in the house level, jack up little by little to correct the subsidence of the house to the specified level.

d. Cement milk filling (Fig. 7)
After the house slope correction is completed to the specified level, cement milk 5 is filled in the gap created between the durable block pile and the ground around the durable block.
The laminated durable blocks are connected to each other and integrated to complete the durable block pile A.

e. Backfilling and filling injection preparation work (Fig. 8)
A spacer 6 is installed in place of the hydraulic jack between the upper surface of the durable block pile A and the bottom surface of the building foundation 10a.
It will be restored by backfilling up to the excavated part.
An injection pipe 8 for filling and injecting is installed in the tunnel portion 3a before backfilling. (Fig. 8)

f. Stuff injection (Fig. 9)
A cement-based injection agent is used to inject the gap between the foundation and the ground that has been lifted by the house modification, and the cement-based injection material is spread between the foundation and the ground. (Fig. 9)
With the above, the construction is completed.

Since the present invention uses a general-purpose durable block and reinforcing bars as construction materials, it has the effect of facilitating construction preparation and reducing construction costs, and thus relates to the restoration of a house foundation. It contributes to the development of industry.

A block foundation pile
1 Durable block
2 Reinforcing bars
4, hydraulic jack
11 Central through hole (reinforcing bar insertion hole)
12 Fill groove

Claims (1)

Durable blocks with a central through hole and a filling groove are stacked, reinforcing bars are inserted into the central through hole to form a block foundation pile, and
Install a hydraulic jack between the durable block and the bottom of the building foundation,
By operating the hydraulic jack, the durable block is press-fitted using the reaction force of the weight of the house building to complete the press-fitting process of the first block.
Place the second durable block on the upper surface of the first durable block, insert the reinforcing bars into the central through hole of the first durable block and the central through hole of the second durable block, and reinforce 2 The lower half is exposed below the 1st stage durable block, and the upper half of the reinforcing bar 2 is located in the central through hole of the 2nd stage durable block, so that the 1st stage durable block and the 2nd stage durable block are located. After connecting the above to each other , cement milk is filled in the space formed between the filling groove of the first-stage durable block and the bottom surface of the second-stage durable block, and the first-stage durable block and the second-stage durable block are filled. By fixing the endurance blocks of the eyes to each other, the process of fixing the endurance block of the first stage to the endurance block of the first stage is completed.
Proceed to the press-fitting process of the second block,
After that, the durable block press-fitting foundation for foundation repair is characterized by continuing the process until the number of stages for completing the block pile with the predetermined load is reached by continuing this process. Construction method.

Images