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1. 发明专利

JPH04319121A CONSTRUCTION OF UNDERGROUND BASE OF BUILDING 失效
公开(公告)号：JPH04319121A
公开(公告)日：1992-11-10
申请号：JP8403991
申请日：1991-04-16
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI , MARU TAKAHIRO
IPC分类号： E02D17/04 , E02D29/045 , E02F3/30 , E21D13/00
摘要： PURPOSE:To secure the safety of operation by improving working environments and by greatly saving powers required in constructing the underground base of a building by an inverted placing method. CONSTITUTION:A sheathing wall 1 and a core columns 3 are constructed from the ground's surface. After the primary excavation is ended, an excavator 8 is movably hung down, and a working stage 5 having floor frames 4 on the upside is assembled for each span and hung down from the upper stage slab to a given level through a hanging rod 11. Floor reinforcing bars 6 are arranged on the floor frame 4 of each stage and between the floor frames 4 on the adjacent span stages 5, and concrete is placed to construct the basement slab. The stage 5 is hung down to a given position after the lapse of a curing period, and floor concrete is placed by using the floor frames. These processes are repeated.

2. 发明专利

JPH04194121A BUILDING METHOD FOR UNDERGROUND BODY FOR BUILDING 失效
公开(公告)号：JPH04194121A
公开(公告)日：1992-07-14
申请号：JP32102990
申请日：1990-11-27
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI , MARU TAKAHIRO
IPC分类号： E02F7/00 , E02D27/10 , E02D29/045 , E21D13/00
摘要： PURPOSE:To improve work executing ability of an underground body by a method wherein after excavation down to a given depth is executed, a stage is assembled and fixed to structural central columns and a landslide protection wall through jacks, the stage is acted as a strut, and used for excavation of the whole surface of a ground below the stage and construction of an upper slab and a beam. CONSTITUTION:A landslide protection wall 1 forming an underground outer wall and a pile and structural central columns 3 to support a pile 2 below an inside column and upper concrete are built from a ground surface part. After first stage excavation is completed, a stage 4 is fixed in a position to the central columns 3 and the landslide protection wall 1 by means of jacks 5 and 6. An excavator previously mounted on the under surface of the stage 4 is operated to excavate a ground below the under surface of the stage 4. Excavated soil is discharged by means of an excavated soil horizontal and vertical conveying member interlocking with movement of an excavator 7. Meanwhile, by means of the stage serving as a support bed, forms for a slab 11 and a beams 12 are frames and reinforcing bars are arranged to place concrete. After concrete of the slab 11 is cured, hydraulic jacks 5 and 6 are contracted, the stage 4 is lowered to a given position, and a preceding process is repeated. This method performs high-efficient discharge of excavated soil, ensures safety of a work, and executes a work even at a soft ground without any trouble.

3. 发明专利

JPH028415A METHOD AND DEVICE FOR CONSTRUCTION OF LANDSLIDE PROTECTION WALL 失效
公开(公告)号：JPH028415A
公开(公告)日：1990-01-11
申请号：JP15790588
申请日：1988-06-28
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI
IPC分类号： E02D17/04
摘要： PURPOSE:To inhibit the deformation and stress of a landslide protection wall at small values, and to decrease the number of the stages of all timberings at the time of large depth by lowering two stages of the upper and lower timberings while the landslide protection wall is suppressed alternately in a measuring worm manner and advancing excavation. CONSTITUTION:Primary excavation is executed in an extent that the deformation of a landslide protection wall 1 is not increased, and two stages of upper and lower timberings A, A' are installed into an excavation section. Secondary excavation is conducted, and the lower-stage timbering A is brought down near an excavation surface B by a jack and fixed. A normal timbering C1 at a first stage is mounted to the upper section of the upper-stage timbering A', and the upper-stage timbering A' is lowered up to the upper section of the lower-stage timbering A by the jack. Excavation, the descent of the lower- stage timbering A, falling near the lower-stage timbering A of the upper-stage timbering A', and the installation of the normal timbering to the upper section of the upper-stage timbering A' are repeated, and excavation is advanced.

4. 发明专利

JPH0533328A METHOD AND DEVICE FOR PREVENTING LIQUEFACTION FROM OCCURRING TO SANDY GROUND IN EARTHQUAKE 失效
公开(公告)号：JPH0533328A
公开(公告)日：1993-02-09
申请号：JP18751791
申请日：1991-07-26
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI
IPC分类号： E02D3/02 , E04H9/02 , F16F15/02
摘要： PURPOSE:To efficiently prevent liquefaction of sandy ground without producing pollution. CONSTITUTION:Bag-like mats 5 are laid under the foundation of a structure 1 built on a loose sand layer 2. The mats 5 are connected with a piping 7 to a water tank 6 installed on the upper part of the structure 1. The mats 5 are filled with water under pressure and are made to apply pressure onto the sand layer 2, utilizing the weight of the structure 1 as a reaction force.

5. 发明专利

JPH04106227A AUTOMATIC EXCAVATOR FOR UNDERGROUND CONTINUOUS WALL 失效
公开(公告)号：JPH04106227A
公开(公告)日：1992-04-08
申请号：JP22369890
申请日：1990-08-24
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI , MARU TAKAHIRO , SHIYA SENKEN
IPC分类号： E02F3/30 , E02D17/13 , E02F3/20 , E02F3/413 , E02F3/47 , E02F5/02
摘要： PURPOSE:To prevent a wire from excessively loosening, by equipping detectors for loads and lifted level on an excavator for chopping works and by automatically actuating the brake of a winch when the bucket reaches a specified position. CONSTITUTION:A load detector 30, an inclination detector 31, a level detector 32, etc., are equipped in an underground excavator carrying out a chopping work by dropping a hydraulic clamshell bucket 235 by its own weight. And an arithmetic processing unit is equipped to wind up and off the winch in accordance with these detected data. And when the clamshell bucket 235 is forced to sink into the excavated ground, the falling time is measured by a timer and when it reaches a preset time, the brake is actuated to stop winding off of the winch. In this way, excessive loosening and disordered winding can be previously prevented.

6. 发明专利

JPH0230806A LIQUEFACTION PREVENTIVE CONSTRUCTION FOR SANDY GROUND AT TIME OF EARTHQUAKE 失效
公开(公告)号：JPH0230806A
公开(公告)日：1990-02-01
申请号：JP18037088
申请日：1988-07-21
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI
IPC分类号： E02D5/80 , E02D3/00 , E02D27/34
摘要： PURPOSE:To effectively prevent sandy ground from being liquefied, without pollution by arranging earth anchors between a pressure-resisting board set under the foundation of a structure and strong ground under the sandy ground, and by introducing prestress. CONSTITUTION:At the lower section and on the periphery of a structure 2 constructed on relaxed sandy ground forecast to be liquefied at the time of earthquake, a pressure-resisting board 3 made of reinforced concrete is set. Then, earth anchors 4 are driven into the pressure-resisting board 3, and the lower ends of the anchors 4 are set on the strong ground 5 of generating no liquefaction, and the earth anchors 4 are stretched and are set on the pressure- resisting board 3, and into the sandy ground 1, prestress is introduced.

7. 发明专利

JPH03244713A DIGGING BUCKET FOR UNDERGROUND CONTINUOUS WALL 失效
公开(公告)号：JPH03244713A
公开(公告)日：1991-10-31
申请号：JP4210390
申请日：1990-02-21
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI , MARU TAKAHIRO
IPC分类号： E02D17/13 , B66C1/62 , B66C3/02 , E02F3/20 , E02F3/47 , E02F5/02
摘要： PURPOSE:To automate digging including chopping and improve the efficiency thereof by supplying working oil to a hydraulic cylinder for chopping of an underground continuous wall digging bucket to raise a bucket support body, and rapidly dropping the bucket support body by instantly discharging the working oil. CONSTITUTION:Working oil is supplied from a hydraulic control device 23 to hydraulic cylinders 21, 22 connecting a bucket supporting body 11 to a member 17 for supporting a sheave 18 around which is wound a suspension wire 19. As a result, the bucket support body 11 including a cram shell 14 rises by a specified amount and the working oil in the hydraulic cylinders 21, 22 under that condition is instantly discharged by the hydraulic control device 23. As a result of this discharge, the bucket support body 11 including a cram shell 14 drops rapidly and the cram shell 14 with its cutting edge is made by a hydraulic jack 15 for opening and closing the cram shell 14 to bite into a hard ground. This automatic chopping action is repeated thereafter.

8. 发明专利

JPH03212510A PILE WITH SPRING 失效
公开(公告)号：JPH03212510A
公开(公告)日：1991-09-18
申请号：JP633490
申请日：1990-01-17
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI , MARU TAKAHIRO
IPC分类号： E02D5/22 , E02D5/60 , E02D27/34 , E02D31/00 , E02D31/08
摘要： PURPOSE:To absorb vibration and impact force applied to a construction by interposing a spring between a case for covering a pile head portion slidably and the upper end surface of the pile, and loading a rust preventing material. CONSTITUTION:A case 2 made of a sheet steel is put on the pile head portion of a high strength concrete pile body 1 in such a manner as to freely slide up and down. A steel spring 4 is interposed between the case 2 and a top cover piece 3a of a pile head reinforcing crown body 3 made by a sheet steel. An oil filler hole 5 is provided in the case 2, and an oil outflow mechanism 6 is disposed on the cover piece 3a. By this arrangement, the spring 4 is expanded and contracted in relation to the load applied to the pile head portion 1, and the case 2 is slid along the pile body 1 to absorb the impact force and vibration applied to a construction.

9. 发明专利

JPH03176509A LOAD TESTING METHOD OF CAST-IN-PLACE PILE AND DEVICE THEREOF 失效
公开(公告)号：JPH03176509A
公开(公告)日：1991-07-31
申请号：JP31427889
申请日：1989-12-05
申请人： FUJITA CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , KOBAYASHI KATSUMI , MARU TAKAHIRO
IPC分类号： E02D5/36 , E02D13/06 , G01L5/00
摘要： PURPOSE:To measure easily and economically by applying water pressure to an elastic pressure bag to load a bottom protective case to the ground, and measuring a quantity of settlement of the bottom protective case, water pressure and each life-free quantity of a top protective case and a pile head section. CONSTITUTION:An elastic pressure bag 4 covered with a top protective case 2 and bottom protective case 3 is loaded to the end of a case-in-place pile 1. Displacement wires 5 and 6 are respectively connected to the cases 2 and 3 to connect to displacement meters 7 and, at the same time, displacement meters 8 provided with pile head displacement measuring bars are loaded to a pile head section. After that, pressure water is poured into the bag 4 by a pressure pump 9 through an injection pipe 10, and the case 3 is pressed and loaded to the ground. A quantity of settlement of the case 3, water pressure and each lift-free quantity of the case 2 and pile head section are measured, and the relation between load of the pile end and settlement and the relation between frictional force of the circumferential surface of the pile and displacement are clearly separated from each other to measure. Accordingly, a load testing method can be easily and economically implemented.

10. 发明专利

JPH038924A PRELOADING BAG BODY DEVICE OF PILE POINT GROUND 失效
公开(公告)号：JPH038924A
公开(公告)日：1991-01-16
申请号：JP14306389
申请日：1989-06-07
申请人： FUJITA CORP , BRIDGESTONE CORP
发明人： YAMAMOTO ITSUO , HAMAZUKA SEIJI , MARU TAKAHIRO , UEDA SHIGEO
IPC分类号： E02D5/62 , E02D5/34
摘要： PURPOSE:To facilitate the insertion of a reinforcement cage or an existing pile to the ground by forming a bag body and a protective case housing the bag body into a circular body provided with a through-hole in the central part thereof and, at the same time, making it possible to expand along the circular body. CONSTITUTION:A pressure rubber closed bag body 2 is fitted to a steel protective case 9 to make a bag body device 1. The bag body 2 is formed into a circular body having a center through-hole passing through from top to bottom, the sides thereof are capable of expanding in the vertical direction with bellows, and coupling pipes 4 and 5 are buried into the upper surface thereof together as a unit. The protective case 9 is so constituted that a lower case 17 is loosely fitted to the periphery of an upper case 10, the bag body 2 is placed upward of the upper case 10, and when the lower case 17 is fitted to the bag body from the bottom, the center through-holes of the circular bodies are overlapped to form a center through-hole 22.

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