IESHIMA CONSTRUCTION CO., LTD

SINCE1919

 

Static Densification Pile -New method

 The SDP-N (STATIC DENSIFICATION PILE -NEW METHOD) method uses a rotary penetrator to statically insert casing pipes into soft sandy ground, and improve materials (sand, crushed stone) even at the time of improved pile construction , Static discharge and return of recycled crushed stone and other materials), and by creating an expanded-diameter compacted pile (expanded-diameter pile), environmentally-friendly static tightening to increase the density of the original ground. Solidified ground improvement method.

 As the name implies, noise is greatly reduced at the time of construction, making it possible to work in the city where you can not work with sand compaction.

■ Construction Technology Examination Certification Council member (goods)
     National Land Research Center
   "General civil engineering method and technology examination and certification No. 27"
     Acquired in February 2011

■ NETIS registration number KTK-100012-V

 Special Member of 

SDP Method Study Group

Characteristics of SDP-N method


1. Quietness in consideration of the surrounding environment (vibration and noise)
 

2. High quality improvement effect (special ground drilling blade)
 

3. Effective use of resources (recycled crushed stone and other recycled materials can be used)

1. Setting the placement position

Set the casing pipe in place and insert point material (packing material).

2. penetration

The auger motor is rotated to penetrate the casing pipe to a specified depth.

3. Build SCP
(Pulled out)

The auger motor is reversely rotated and the filling material is discharged from the tip while pulling out the casing pipe.

4. Build SCP
(Backing)

The casing pipe is backed up to expand and compact the filling material discharged from the tip.

5. To the specified depth construction

The SCP is continuously created by repeating drawing, punching back and filling material filling to a predetermined depth.

6. Completed installation

Move the casing pipe to the ground position and pull it to the next position.

 

Sand compaction Pile - method

 The SCP (SAND COMPACTION PILE) method is a method that combines multiple basic principles such as ground compaction, reinforcement and consolidation drainage.
 

 In sandy ground, the strength of the ground is enhanced, and it has a great effect on preventing liquefaction of the ground, and on viscous ground, increase in ground bearing capacity, prevention of slippage failure, early stabilization of residual settlement and uneven settlement You can get the prevention effect.

Feature of SCP method
1. High work efficiency (efficiency compared to SDP-N)
2. Cost performance associated with it (streamlining of work unit price)

Construction procedure of SCP (sand compaction pile) method

1. Setting the placement position

Set the casing pipe in place.

2. penetration

Shake the vibro hammer and penetrate the casing pipe to the specified depth.

3. Construct SCP (pulled out)

Insert the filling material and remove the filling material from the tip while pulling out the casing pipe.

4. SCP construction(backing)

The casing pipe is backed up to expand and compact the filling material discharged from the tip.

5. Build up to a predetermined depth

The SCP is continuously created by repeating drawing, punching back and filling material filling to a predetermined depth.

6. Completed installation

Move the casing pipe to the ground position and pull it to the next position.

 

Sand drain, gravel drain method

 In the sand drain (SAND DRAIN) method, the casing pipe is penetrated into a soft, viscous soil floor, the sand in the pipe is drained and pulled out, and a number of vertical sand piles are driven to shorten the drainage distance and achieve consolidation. It is a method of promotion.

 The gravel drain method, on the other hand, is one of the measures against liquefaction that uses single-size crushed stone instead of sand. It will be a construction method to set up crushed stone pillars in loose sandy ground and quickly drain off excess pore water generated during an earthquake.

Sand drain

Measures for consolidation and settlement of cohesive soil (material: sand)
 

Gravel drain

Measures for liquefaction (material: single-size crushed stone)

Construction procedure of sand (gravel) drain method

1. Setting the placement position

Set the casing pipe in place.

2. Casing penetration

Shake the vibro hammer and penetrate the casing pipe to the specified depth.

3.SD造成(引抜き)

 

中詰め材料を投入してケーシングパイプを引抜ながら中詰め材料を先端部から排出し、所定の深度まで充填します。

4.SCP造成

(打戻し)

 

ケーシングパイプを打戻して、先端部から排出した中詰め材料の拡径・締固めを行います。

 

Plastic board drain method

The plastic board drain method is a method using plastic drain material.

By placing drains at regular intervals in a soft, viscous soil, the drainage distance is shortened, consolidation settlement is promoted, and the strength of the ground is increased.

Construction procedure of plastic board drain method

1. Setting the placement position

Fix the drain material to the casing end with an anchor plate and set it in place.

2. penetration

The casing pipe is penetrated to a specified depth by the hydraulic penetration device

3. Complete penetration

The penetration is completed when the specified depth is reached.

4. Pull out

Leave the drain material fixed to the end of the casing in the ground and pull out only the casing pipe.

5. Completed pulling out

Pull out the casing pipe to about 1 m above the ground.

6. Drain material cutting

Use special scissors to cut the drain material.

 

Deep mixing processing method

Deep mixing method is a kind of chemical ground improvement method and cement is supplied as a stabilizer (consolidated material) to soft layer of deep layer and uniformly mixed, and the soft layer is reinforced by consolidation action such as porizone reaction Construction method.

The required strength can be obtained in a short time, and the construction period can be significantly shortened. If earth removal type construction machines are used, ground displacement is small and close construction to existing structures is possible.

Construction procedure of deep mixing treatment method

1. Setting the placement position

Set the rod end to the specified position.

2. penetration

The auger motor is rotated, and the improvement material is discharged from the tip of the stirring blade to penetrate and agitate.

3. Complete penetration

When reaching the specified depth, stop penetration and discharge and perform tip processing.

4. Pull out

Reverse the rotation of the stirring blade and stir the improvement material while pulling it out.

5. Completed installation

Move the stirring blade to the next position after pulling it out to the ground.

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IESHIMA CONSTRUCTION CO., LTD

SINCE1919

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