JP3155456B2 - Pile structure to be joined to floor slab connected to foam resin material, and construction method of pile structure - Google Patents
Pile structure to be joined to floor slab connected to foam resin material, and construction method of pile structureInfo
- Publication number
- JP3155456B2 JP3155456B2 JP35172495A JP35172495A JP3155456B2 JP 3155456 B2 JP3155456 B2 JP 3155456B2 JP 35172495 A JP35172495 A JP 35172495A JP 35172495 A JP35172495 A JP 35172495A JP 3155456 B2 JP3155456 B2 JP 3155456B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- floor slab
- resin material
- pile structure
- joined
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【０００１】[0001]
【発明の属する技術分野】この発明は、軟弱地盤におけ
る、対策工法の一つである杭工法において、発泡樹脂材
に接続する床版と接合する杭構造、及び杭構造の施工工
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile structure which is joined to a floor slab connected to a foamed resin material, and a construction method of the pile structure in a pile method which is one of countermeasure methods in soft ground. .
【０００２】[0002]
【従来の技術】従来、軟弱地盤における杭工法は、構造
物の沈下増加応力が軟弱地盤の反力を上回る為に、杭の
支持力で沈下対策を行ってきている。また、杭打設方法
は、杭打設機材の重量が、軟弱地盤の地盤反力を上回る
ために、様々な地盤改良工法を行ったあとでなければ、
作業できなかったり、杭打設のための、養生仮設工事が
必要となり、費用と期間が、多く費やされてきた、ま
た、杭の支持力を計算する場合、発泡樹脂材で軽減され
る沈下増加応力軽減量は、計算されていなかったもので
ある。2. Description of the Related Art Conventionally, in the pile construction method on soft ground, measures against settlement have been taken with the support force of the pile, because the settlement increasing stress of the structure exceeds the reaction force of the soft ground. In addition, the pile driving method, unless the weight of the pile driving equipment exceeds the ground reaction force of the soft ground, after performing various ground improvement methods,
Inability to work, or the need for temporary curing work for pile driving, which has required a great deal of cost and time. In addition, when calculating the bearing capacity of piles, settlement is reduced with foamed resin material. The amount of increased stress relief has not been calculated.
【０００３】[0003]
【発明が解決しようとする課題】従来の杭工法は、上記
の通り、軟弱地盤においては地盤改良等、打設のための
養生仮設工事が必要であり、工事が面倒で、しかも時間
が掛かるという欠点があった。本発明は、上記従来の杭
工法の問題点を解決するとともに、発泡樹脂材で沈下増
加応力を軽減することによって杭の本数も少なくなり、
その分工事費が安くなり工事期間も短くなるという利点
がある。また、軟弱地盤における、建物、道路、水路、
地下構造物等、種々の基礎の用途に供することが可能
な、杭構造、及び杭構造の施工工法を提供するものであ
る。As described above, the conventional pile construction method requires temporary curing work for driving, such as soil improvement, on soft ground, which is cumbersome and time-consuming. There were drawbacks. The present invention solves the above-mentioned problems of the conventional pile method, and reduces the number of piles by reducing the settlement increasing stress by using a foamed resin material,
There is an advantage that the construction cost is reduced and the construction period is shortened accordingly. Buildings, roads, waterways,
An object of the present invention is to provide a pile structure and a construction method of the pile structure that can be used for various foundation uses such as an underground structure.
【０００４】ここで、このような従前の欠点を改良する
ために、（１）所定の厚さ、並びに必要な面積に配置し
た発泡樹脂材に接続する床版と、杭が接合することを特
徴とする杭構造、（２）床版と杭をコンクリートを用い
て接合することを特徴とする上記（１）記載の杭構造、
（３）床版の下部と杭の頭部を緩衝材を介して接合する
ことを特徴とする上記（１）記載の杭構造、（４）杭の
頭部と緩衝材の間に、該杭の頭部の面積より大きい定盤
を介して接合することを特徴とする上記（３）記載の杭
構造、（５）所定の厚さ並びに必要な面積に施工した発
泡樹脂材に接続する床版からなる盤に、杭打設機材が載
り、床版に予め設けた杭打設のための空間から杭を打設
し、床版と杭を接合することを特徴とする杭構造の施工
工法、（６）軟弱地盤において、杭打設機材の重量によ
って、盤が沈下しない量の発泡樹脂材を地盤に設置する
ことを特徴とする上記（５）記載の杭構造の施工工法、
（７）杭の支持力計算において、発泡樹脂材によって、
地盤に対する沈下増加応力の軽減量を杭の支持力に加算
することを特徴とする上記（５）又は（６）に記載の杭
構造の施工工法を提供しようとするものである。本発明
にかかる発泡樹脂材に接続する床版と接合する杭構造、
及びその施工工法は、以下の実施形態から明らかになる
であろう。Here, in order to improve such a conventional drawback, (1) a pile is joined to a floor slab connected to a foamed resin material having a predetermined thickness and a required area. (2) The pile structure according to the above (1), wherein the floor slab and the pile are joined using concrete.
(3) The pile structure according to (1), wherein the lower portion of the floor slab and the head of the pile are joined via a cushioning material; and (4) the pile is provided between the head of the pile and the cushioning material. (3) The pile structure according to the above (3), wherein the slab is connected to a foamed resin material having a predetermined thickness and a required area. Pile construction equipment is mounted on a board consisting of, piles are laid from a space for pile laying previously provided on the floor slab, and the pile slab and the pile are joined together, (6) The pile construction method according to (5), wherein in the soft ground, an amount of the foamed resin material that does not sink the ground due to the weight of the pile driving equipment is installed on the ground.
(7) In calculating the bearing capacity of the pile,
It is an object of the present invention to provide a construction method for a pile structure as described in the above (5) or (6), wherein the amount of reduction of the settlement increasing stress on the ground is added to the supporting force of the pile. A pile structure to be joined to a floor slab connected to the foamed resin material according to the present invention,
And the construction method will become clear from the following embodiments.
【０００５】[0005]
【発明の実施の形態】以下、この発明の実施例を図１に
おける全体の斜視図、図２における盤の断面図に基づい
て順をおって説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in order with reference to an overall perspective view in FIG. 1 and a sectional view of a board in FIG.
【０００６】調査段階として、（１）地質調査を行い、
地盤の長期許容支持力を求める、次に、（２）構造物の
計画沈下増加応力を求め、（３）必要とする、長期許容
支持力を求め、対策工法を検討する。At the survey stage, (1) a geological survey is conducted,
The long-term allowable bearing capacity of the ground is determined, and then (2) the planned settling increase stress of the structure is determined, and (3) the required long-term allowable bearing capacity is determined, and countermeasures are studied.
【０００７】設計について、説明する。（４）杭から得
られる支持力、軽量置き換え材による沈下増加応力軽減
量及び構造物の構造計算から、杭と発泡樹脂材の使用数
量を計算する、（５）（４）で求められた使用数量か
ら、杭の数量、軽量置き換え材の厚さ面積を求め、盤の
割り付け図を作成する。The design will be described. (4) Calculate the number of piles and foam resin materials used from the bearing capacity obtained from the piles, the amount of reduced settlement increase stress by lightweight replacement materials, and the structural calculation of the structure. (5) Use calculated in (4) From the quantity, calculate the quantity of piles and the thickness area of lightweight replacement materials, and create a layout plan for the board.
【０００８】計算例について、説明する。調査、設計条
件から、Ａ）構造物の沈下増加応力３．０ｔｆ／ｍ2、
Ｂ）地盤の長期許容支持力１．０ｔｆ／ｍ2、Ｃ）杭の
長期許容支持力０．８ｔｆ／ｍ2、Ｄ）土と置き換えた
発泡ポリスチレンブロックによる沈下増加応力減少量
２．０５５ｔｆ／ｍ2、Ｅ）床版の沈下増加応力０．２
５ｔｆ／ｍ2、Ｆ）杭打設機材の沈下増加応力０．８ｔ
ｆ／ｍ2、安全率Ｆｓ＝１．２とすれば、Ａ×Ｆｓ＝
３．６ｔｆ／ｍ 2 、Ｂ＋Ｃ＋Ｄ−Ｅ＝３．６０５ｔｆ／
ｍ 2 となり、 Ａ×Ｆｓ＜（Ｂ＋Ｃ＋Ｄ−Ｅ）が成立する。 従って、構造物の沈下増加応力による沈下は無い。次
に、杭打設機材が盤に載り、杭打設作業をする場合の沈
下に対する計算は、Ｆ×Ｆｓ＝０．９６ｔｆ／ｍ 2 、Ｂ
＋Ｄ−Ｅ＝２．８０５ｔｆ／ｍ 2 となり、 Ｆ×Ｆｓ＜Ｂ＋Ｄ−Ｅ、 即ち、（Ｆ×Ｆｓ）＋Ｅ＜Ｂ＋Ｄが成立する。 従って、
沈下は無い。A calculation example will be described. From the investigation and design conditions, A) the settlement increasing stress of the structure is 3.0 tf / m 2 ,
B) Long-term allowable bearing capacity of the ground: 1.0 tf / m 2 , C) Long-term allowable supporting capacity of the pile: 0.8 tf / m 2 , D) Increase in settlement-induced stress reduction by expanded polystyrene block replaced with soil 2.055 tf / m 2 , E) Sink increasing stress of floor slab 0.2
5tf / m 2 , F) Increased settlement stress of pile driving equipment 0.8t
f / m 2 and safety factor Fs = 1.2, A × Fs =
3.6 tf / m 2 , B + C + DE = 3.605 tf /
m 2 , and A × Fs <(B + C + DE) holds. Therefore, there is no settlement due to the increased settlement stress of the structure. Next, the calculation for settlement when the pile driving equipment is put on the board and pile driving is performed is as follows: F × Fs = 0.96 tf / m 2 , B
+ DE = 2.805tf / m 2 , and F × Fs <B + DE, that is, (F × Fs) + E <B + D is satisfied. Therefore,
There is no subsidence.
【０００９】施工について、説明する、（６）地盤基面
工を行う。予め掘削した地盤に対し、レベリング層６を
施工する。レベリング層６は、一般には、敷砂８し調整
するが、床が乱れる場合は、敷砂８とジオグリット又は
土木シート７を敷いてレベリング層６を施工する。
（７）置き換え材設置工を行う。軽量置き換え材５の材
質は、発泡ポリスチレンブロックが好ましいが、必要な
強度が有れば、他の発泡樹脂でも、発泡樹脂とコンクリ
ートを混合した、発泡樹脂材でも良い、（８）床版工を
行う。床版１は、軽量置き換え材５の上に、床版１補強
の為鉄筋２を配筋し、杭スペース４を確保して、コンク
リートを打設する、（９）杭工を行う。杭３は、地盤掘
削の前に打設しても、床版１が出来上がってから打設し
ても良い、但し、杭打設の為の養生仮設工事が必要な場
合は、床版１を利用すれば、養生仮設工事の費用と工期
が省かれ経済的である。床版１を利用する場合の説明を
する。杭打設機材は床版上を移動して、床版１に予め確
保した杭スペース４から、杭３を打設する、杭の頭部１
０の位置は、床版１の下でも、中間でも、上の面でも良
いが、振動、地震による振動を考慮すれば、床版１下の
部分が良い、（１０）杭頭部と床版の接合工を行う。床
版１の杭スペース４に、鉄筋２で床版１を補強して、コ
ンクリート１１充填接合する、図２は、床版１の下で接
合する場合である。杭頭部１０に定盤１２、緩衝材９を
介して床版１と接合する。定盤１２は、杭頭部１０の面
積より、大きくし、床版１から緩衝材９を介して杭頭部
１０に伝達する荷重を分散して緩衝材９を保護する為に
用いる。緩衝材９の材質は、ゴムであっても発泡樹脂
材、例えば発泡ポリプロピレンでも、杭の支持力を上回
る圧縮強度が有れば良い。例えば、杭の支持力１本当た
り、５０トンとした場合、定盤１２と緩衝材９の面積を
１ｍ2 としたら緩衝材９の圧縮強度は、５Ｋｇｆ／ｃｍ
2 に安全率２０％を加算した６Ｋｇｆ／ｃｍ2 が必要で
ある。この構造は、地震に対する免震構造にもなる。こ
の発明は、このような発泡樹脂材に接続する床版と接合
する杭構造、及び杭構造の施工工法による、構造物の沈
下対策並びに土圧軽減工法を提供するものである。[0009] The construction will be described. The leveling layer 6 is constructed on the ground excavated in advance. In general, the leveling layer 6 is adjusted with the spread sand 8. However, when the floor is disturbed, the leveling layer 6 is constructed by spreading the spread sand 8 and the geogrid or the civil engineering sheet 7.
(7) Replacement material installation work is performed. The material of the lightweight replacement material 5 is preferably a foamed polystyrene block, but if it has the necessary strength, it may be another foamed resin or a foamed resin material obtained by mixing foamed resin and concrete. Do. The floor slab 1 is provided with a reinforcing bar 2 for reinforcing the floor slab 1 on the lightweight replacement 5, securing a pile space 4 and placing concrete. (9) Pile work is performed. The pile 3 may be set before the ground excavation or may be set after the floor slab 1 is completed. However, if the curing temporary construction work for setting the pile is necessary, the slab 3 may be set. If it is used, the cost and construction period of curing temporary construction will be saved and it will be economical. The case where the floor slab 1 is used will be described. The pile driving equipment moves on the floor slab and drives the pile 3 from the pile space 4 previously secured on the floor slab 1.
The position of 0 may be below, in the middle, or on the upper surface of the floor slab 1. However, considering vibration and vibration caused by an earthquake, the portion below the floor slab 1 is good. (10) Pile head and floor slab Of the joint. The floor space 1 of the floor slab 1 is reinforced with the reinforcing bar 2 and the concrete 11 is filled and connected to the slab space 4. FIG. The pile head 10 is joined to the floor slab 1 via the platen 12 and the cushioning material 9. The surface plate 12 is used to protect the cushioning material 9 by increasing the area of the pile head 10 and dispersing the load transmitted from the floor slab 1 to the pile head 10 via the cushioning material 9. The material of the cushioning material 9 may be rubber or a foamed resin material, for example, foamed polypropylene, as long as the material has a compressive strength exceeding the supporting force of the pile. For example, when the supporting force of a pile is 50 tons, the compressive strength of the cushioning material 9 is 5 kgf / cm when the area of the surface plate 12 and the cushioning material 9 is 1 m 2.
6 kgf / cm 2 which is obtained by adding 20% of safety factor to 2 is required. This structure is also a seismic isolation structure against earthquakes. The present invention provides a pile structure to be joined to a floor slab connected to such a foamed resin material, and a settlement method for a structure and an earth pressure reduction method by a construction method of the pile structure.
【００１０】[0010]
【発明の効果】この発明に係る発泡樹脂材に接続する床
版と接合する杭構造、及び杭構造の施工工法は、杭と軽
量置き換え材を使用するため、構造物の沈下対策、土圧
軽減が非常に簡単に出来、発泡樹脂材に対する水による
浮力にも安全施工出来る、また、杭の仮設工事が無いの
で工事期間が短くて済み、従来工法より経済的にも安価
に提供出来るという効果をも有するものである。According to the present invention, a pile structure to be joined to a floor slab connected to a foamed resin material according to the present invention, and a construction method of the pile structure use a pile and a lightweight replacement material. It is very easy to use, and the construction can be carried out safely even with the buoyancy of the foamed resin material due to water. It also has
【図１】 全体斜視図FIG. 1 is an overall perspective view.
【図２】 盤断面図[Figure 2] Sectional view of board
１ 床版 ２ 鉄筋 ３ 杭 ４ 杭スペース ５ 発泡ポリスチレン ６ レベリング層 ７ ジオグリット又は土木シート ８ 敷砂 ９ 緩衝材 １０ 杭頭部 １１ 充填コンクリート １２ 定盤 DESCRIPTION OF SYMBOLS 1 Floor slab 2 Reinforcement 3 Pile 4 Pile space 5 Polystyrene foam 6 Leveling layer 7 Geogrid or civil engineering sheet 8 Paving sand 9 Buffer material 10 Pile head 11 Filling concrete 12 Surface plate
Claims (7)
た発泡樹脂材に接続する床版と、杭が接合することを特
徴とする杭構造。1. A pile structure wherein a pile is joined to a floor slab connected to a foamed resin material having a predetermined thickness and a required area.
ることを特徴とする請求項１記載の杭構造。2. The pile structure according to claim 1, wherein the floor slab and the pile are joined using concrete.
接合することを特徴とする請求項１記載の杭構造。3. The pile structure according to claim 1, wherein a lower portion of the floor slab and a head of the pile are joined via a buffer material.
面積より大きい定盤を介して接合することを特徴とする
請求項３記載の杭構造。4. The pile structure according to claim 3, wherein the pile head and the cushioning material are joined via a surface plate larger than the area of the pile head.
発泡樹脂材に接続する床版からなる盤に、杭打設機材が
載り、床版に予め設けた杭打設のための空間から杭を打
設し、床版と杭を接合することを特徴とする杭構造の施
工工法。5. A pile driving machine is mounted on a board made of a floor slab connected to a foamed resin material having a predetermined thickness and a required area, and the pile driving machine is mounted on the floor slab. A construction method for a pile structure characterized by placing a pile and joining the slab and the pile.
よって、盤が沈下しない量の発泡樹脂材を地盤に設置す
ることを特徴とする請求項５記載の杭構造の施工工法。6. The pile construction method according to claim 5, wherein in a soft ground, an amount of foamed resin material is set on the ground so that the pile does not sink due to the weight of the pile driving equipment.
よって、地盤に対する沈下増加応力の軽減量を杭の支持
力に加算することを特徴とする請求項５又は６に記載の
杭構造の施工工法。7. The construction of a pile structure according to claim 5, wherein, in the calculation of the pile supporting force, a reduction amount of the settlement increasing stress to the ground is added to the pile supporting force by the foamed resin material. Construction method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35172495A JP3155456B2 (en) | 1995-12-16 | 1995-12-16 | Pile structure to be joined to floor slab connected to foam resin material, and construction method of pile structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35172495A JP3155456B2 (en) | 1995-12-16 | 1995-12-16 | Pile structure to be joined to floor slab connected to foam resin material, and construction method of pile structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09165758A JPH09165758A (en) | 1997-06-24 |
| JP3155456B2 true JP3155456B2 (en) | 2001-04-09 |
Family
ID=18419190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35172495A Expired - Lifetime JP3155456B2 (en) | 1995-12-16 | 1995-12-16 | Pile structure to be joined to floor slab connected to foam resin material, and construction method of pile structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3155456B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2980604B1 (en) | 1998-11-19 | 1999-11-22 | 中村物産有限会社 | Vibration isolation foundation structure of building and its construction method |
| JP5382399B2 (en) * | 2007-10-03 | 2014-01-08 | 清水建設株式会社 | Thermal insulation and curing method for mass concrete |
-
1995
- 1995-12-16 JP JP35172495A patent/JP3155456B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09165758A (en) | 1997-06-24 |
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