JPH09221762A - Method for placing plate and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and easily set a device for a plate test in a short time by a small number of operators when the test is conducted in a workroom for a pneumatic caisson. SOLUTION: A support pipe 6 is elevated by a support-pipe lifting jig installed on the excavation-bit mounting section of an excavator in specified height, and arranged vertically while the upper end of the pipe 6 is placed between a pair of rails 2 for travelling. Both end sections of a support-pipe support arm 11 are placed on the rails 2 for travelling by bringing the support-pipe support arm 11 of a reaction receiver 10 for lifting the support pipe rotatably set up in a freely vertically movable manner to the support pipe 6 within a specified range to the state parallel with the rails 2 for travelling and elevating the reaction receiver 10, rotating the support-pipe support arm 11 at a fixed angle and drawing up the support arm 11 again at that time. The upper section of the support pipe 6 is abutted against a ceiling slab surface 1 by operating a traction means for drawing up the support pipe stretched between the reaction receiver 10 and the support pipe 6, and a fluid pressure jack 8 for placing is interposed between the lower end of the support pipe 6 and the ground 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for loading a flat plate on the ground, and in particular, the strength of the ground can be rapidly controlled by remote control within a limited time under a high-pressure special environment such as a working room of a pneumatic caisson. The present invention relates to a flat plate loading method and device used in a test for evaluating deformation characteristics.

[0002]

2. Description of the Related Art One of the characteristics of the pneumatic caisson method is that a flat plate loading test can be carried out for the purpose of confirming the bearing capacity of the foundation bottom supporting ground. For example, in order to estimate the bearing capacity-subsidence relationship of a long-span bridge foundation and other structures, a ground proof test is conducted in the pneumatic caisson's working room to determine the vertical ground reaction coefficient and ultimate bearing capacity. A test may be conducted to check the ground condition.

By the way, when carrying out this flat plate loading test in the working chamber of a pneumatic caisson, working pressure is 3 kgf /
When the work is performed by suctioning the helium mixed gas through the mask at cm ² or more, there is a limitation that the time under a high pressure of one day is about 90 minutes to 120 minutes and the number of box engineers is 4 or less. Therefore, under this condition, it is necessary to carry out a flat plate loading test in the minimum construction period, but in the conventional method, the prop pipes used in the loading test are set in a predetermined arrangement, and the number of people in the box It takes a lot of time to set up the test equipment that relies on the.

The conventional test method will be described with reference to FIG. 29. This figure shows a test apparatus installed in the working chamber of a pneumatic caisson. Steel having a thickness of 22 mm and a diameter of 300 mm is formed on the surface of the ground 4 of the working chamber 5. A circular plate (hereinafter referred to as a loading flat plate) 27 is placed, the hydraulic jack 20 and the support pipe 26 are sequentially loaded on the flat plate 27, and the ceiling slab surface 1 of the working chamber 5 is placed through the upper end of the support pipe 26. Is in contact with. The hydraulic jack 20 has a pump 23 through a pipe 24.
Is connected to

Further, a supporting leg 22 is provided on the surface of the ground 4 which is more than three times the diameter of the loading flat plate, and the beam member 21 made of H steel is supported by this supporting leg 22 and provided on the loading flat plate 27. The dial gauge 28 and the magnet stand 29 provided on the beam 21 are connected.

Further, in FIG. 29, an eye bolt 31 is installed by an anchor 30 in order to suspend the support pipe 26 from the ceiling slab surface 1, and the support pipe 26 is lifted in a V shape between the lower end flange 32 of the support pipe 26 and the eye bolt 31. By tensioning the chain 33, the upper end of the strut pipe 26 is hung so as to be in contact with the ceiling slab surface 1. In this state, the hydraulic jack 20 is provided at the lower end of the strut pipe 26, and then the lifting chain. 33 is removed and the hydraulic jack 20
Is extended and a reaction force is applied to the ceiling slab surface 1 via the support pipes 26 to perform a loading test.

By the way, the flat plate loading test is simple if the top end of the movable piston of the hydraulic jack 20 is brought into direct contact with the ceiling slab surface 1 to perform the test, but in reality, the top end of the hydraulic jack 20 and the ceiling slab are tested. Between surface 1 and 1.5m-1.8
Since there is more than m, the above-mentioned strut pipe 26 is always used to fill this space.

In order to carry out a load test with the above-mentioned apparatus, first, the flat plate 27 for loading is made to fit into the ground 4, so that a load of about 1/10 of the expected yield load is applied to the flat plate 2 and then the load is once removed. , The number on the dial gauge 28 is read and used as the origin of displacement.

Next, a load of about 1/10 of the expected yield load is applied to the loading flat plate 27, and the load strength and the subsidence amount of the ground 4 are read. Immediately increase the load to the next load stage and continue measurement. Repeated loading is 1/2 of expected yield load
Perform near the load. This load test is usually performed until the load-sink curve becomes parallel to the squat axis or the load strength exceeds the yield point of the ground, and the test is terminated there. When the load increases without reaching the yield point, the flat plate 27 may be terminated when the sinking amount reaches 10% of the diameter of the flat plate for loading.

Further, the dial gauge 28, the hydraulic pump 23, etc. in the test chamber have a measuring cord 35 penetrating the ceiling slab via a conduit 34 and a load monitor cable 36.
Static strain measuring device 3 placed in the measurement room 37 on the ground via
8, the personal computer 39, and the load operation panel 40 are connected, and a loading test can be performed by remote control in the measurement room 37, and the result is also output from the printer 41.

[0011]

The preparation work for the loading test in the pneumatic caisson box described above requires a small number of workers and quickness within a limited time. In the conventional method as shown, since the supporting pipe 26 is installed by the worker by using the lifting chain 33, it takes a lot of time and labor, and a smaller number of workers requires the supporting pipe 26 in the shortest possible time. It was not possible to meet the demand to provide a system for setting a test device including the above arrangement and easily moving the support pipes in the working chamber to quickly perform a flat plate loading test at a plurality of points.

It is an object of the present invention to provide a flat plate loading test method and apparatus which solve the above problems.

[0013]

In order to solve the above-mentioned problems, according to the present invention, an excavator 3 traveling along a pair of parallel traveling rails 2 fixed to a ceiling slab surface 1 excavates the ground 4. In the working chamber 5 of the pneumatic caisson to be excavated, the upper end portion of the support pipe 6 is brought into contact with the ceiling slab surface 1, and the loading flat plate 7 and the fluid pressure jack 8 are interposed between the support pipe 6 and the ground 4. In a flat plate loading method in which the fluid pressure jack 8 is extended and a load test is performed by taking a reaction force to the ceiling slab surface 1 via the support pipe 6, the support pipe 6 is lifted by an appropriate lifting means to make a pair of upper parts thereof. Between the traveling rails 2 and arranged vertically, and at this time, the strut pipe support of the strut pipe lifting reaction force receiver 10 provided on the strut pipe 6 so as to be vertically movable and rotatable within a predetermined range. Running arm 11 After the reaction force receiving member 10 is lifted and the support pipe support arm 11 is rotated a predetermined angle and pulled down again, the both ends of the support pipe support arm 11 are moved to the running rail. 2 is placed on the ceiling slab surface 1 by operating the strut pipe pulling pulling means 12 stretched between the reaction force receiver 10 and the strut pipe 6. Moreover, a fluid pressure jack 8 for loading is interposed between the lower end of the support pipe 6 and the ground 4. At the time of a load test at another point, the traction means 1 for pulling up the pillar pipe
2 comprises a chain block 16 in which the tip of the chain 15 is locked to the reaction force receiving device 10 and fixed to the support pipe 6, and the chain block 16 is operated to make the upper end of the support pipe 6 the ceiling slab surface. 1 and lower the rollers 17 at both ends of the support pipe support arm 11 to the rail 2 for running.
It is recommended that the support pipe 6 be rolled along with to move the support pipe 6 to another loading point. The lifting means for the support pipe 6 is constituted by a support pipe lifting jig 18 provided on the excavation bit 13 of the excavator 3. Further, the present invention has a ceiling slab surface 1
In the working room 5 of the pneumatic caisson for excavating the ground 4 by the excavator 3 traveling along a pair of parallel traveling rails 2 fixed to the ceiling slab surface 1, the upper end of the pillar pipe 6 is applied to the ceiling slab surface 1. In the flat plate loading device in which the loading flat plate 7 and the fluid pressure jack 8 are interposed between the strut pipe 6 and the ground 4, and the fluid pressure jack 8 is extended to perform a loading test, the strut pipe 6 is connected to the strut pipe. A column support arm 11 that is vertically movable and rotatable in a predetermined range along 6 and is capable of engaging both ends with the traveling rail 2
A support pipe lifting tool 10 for holding the support pipe, a locking tool 19 for locking a support pipe lifting jig 18 provided on the excavator 3, and one end of the reaction support 10 for locking the support pipe 6 This chain 1 and the chain 15 that locks the other end to
5, a strut pipe pulling pulling means 12 including a winding means for shortening 5 is provided. According to the present invention, it is possible to arrange the support pipe 6 at a predetermined position and move it to another loading test point easily and quickly with a small number of people.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a state of excavation by an excavator in a working room in a pneumatic caisson, in which two traveling rails 2 parallel to the lower surface of the ceiling slab surface 1 are fixed, and a central bogie traveling along the traveling rails 2. The excavator 3 is suspended and supported by the main body 42, and the excavator 3 moves along the traveling rail 2 to excavate the ground 4 by the excavation bucket 43 at the tip thereof.

According to the present invention, when the ground 4 of the working chamber 5 in the pneumatic caisson is subjected to a load test using a flat plate, the support pipes 6 used therein are arranged at predetermined positions and at a plurality of positions in the working chamber 5. By using the rail 2 for running, the movement to a plurality of points for a load test can be performed easily and quickly by a smaller number of engineers.

FIG. 2 shows a strut pipe 6 suspended from the ground into the working chamber 5, and FIG. 3 shows a strut pipe lifting jig 18 detachably attached to the tip of the excavation bucket 43 of the excavator 3. , Showing a state where the support pipe 6 is being lifted. At this time, the strut pipe 6 has a strut pipe support arm 11 that is movable up and down within a predetermined range and is rotatable around the strut pipe 6. 6 can be supported on the traveling rail 2, and the upper end of the pillar pipe 6 can be brought into contact with the ceiling slab surface 1 by a simple operation described later. Therefore, in this state, a fluid pressure jack (described later) for applying pressure can be easily bitten between the lower end of the support pipe 6 and the ground 4, and the test preparation can be completed quickly. Further, when changing the point of the loading test, the support pipe 6 can be easily moved to the next test point in the working chamber 5 while being suspended from the traveling rail 2.

FIG. 4 shows a flat plate load test apparatus set in the working chamber 5 of the pneumatic caisson using the method of the present invention. To explain the outline of the figure, the upper portion of the support pipe 6 is arranged between the traveling rails 2 and 2 made of H-shaped steel and arranged in parallel at a constant interval, and the support pipe 6 is provided. Has an upper end abutting the lower end of the ceiling slab surface 1, and a fluid pressure (hydraulic) jack 8 having a loading flat plate 7 integrally provided at the lower end is disposed between the support pipe 6 and the ground 4. ing.

The fluid pressure jack 8 is further provided with a displacement gauge 44 and a pressure converter 45, and a hydraulic hose 46 and a measurement cable 47 connected to the displacement gauge 44 and a pressure transducer 45 have a penetrating piece 49 embedded in a caisson ceiling slab 48. The hydraulic hose 46 is led out to the measurement room 50 on the ground through the work room 5 via the remote hydraulic unit 51 and the remote hydraulic unit controller 52 installed in the measurement room 50, and the measurement cable 47 is The static strain measuring device 53, the personal computer 54, and the printer 55 are connected respectively.

In the present invention, the supporting pipe 6 is set to the position shown in FIG. 4 (that is, the arrangement position at the time of the load test) by using the operation means which can be said to be semi-automatic. There is a feature in doing so, so that will be explained next.

As shown in FIG. 4, the support pipe 6 is a space between the top end of the fluid pressure jack 8 having a loading flat plate 7 installed on the ground 4 in the working chamber 5 and the ceiling slab surface 1. It is arranged to fill the (space), and generally the length of the support pipe 6 is about 1.5 m to 1.8 m, and the diameter is 2
It is about 0 cm.

The support pipe 6 is a caisson ceiling slab 48.
After being carried into the working chamber 5 in the state shown in FIG. 2 through the equipment entrance / exit portion (material lock) provided in the excavator 3, it is lifted by the excavation bucket 43 of the excavator 3 as shown in FIG. The state shown in FIG. 8 is finally set through the steps of FIGS.

Therefore, the support pipe 6 is constructed as follows. The pillar pipe 6 has a top plate 56 and a bottom plate 5 at the upper and lower ends.
7 and a predetermined height position from the lower end, that is, a position suitable for a person to grasp and lift the support pipe 6 for handling, specifically, a position slightly below the middle of the support pipe 6 The grip 58 is fixed. Further, a stopper 59 is provided at a position lower than the upper end of the strut pipe 6 by a predetermined distance. The stopper 59 locks the stopper 59 to prevent downward movement, and the upper portion thereof is vertically movable and rotatable. A lifting reaction force receiver 10 is provided.

As shown in FIGS. 15 to 17, the main body 10A of the column pipe lifting reaction force receiver 10 has an upper plate 61 and a lower plate 62 each having a column pipe insertion hole 60, and upper and lower plates 61, 62. Vertical side plates 64, 64, which are arranged between the two and have pipe support arm insertion holes 63 at both ends,
And bending rods 71, whose both ends are fixed to the upper and lower plates 61, 62,
And 71.

The two support pipe support arms 11 shown in FIGS. 18 and 19 are inserted into the pipe support arm insertion holes 63 of the vertical both side plates 64 in parallel and freely to be inserted and removed. The pillar pipe support arm 11 is composed of a shaft body of a predetermined length, rollers 17 are rotatably fitted to both ends of the arm body, and a locking screw is attached from the outer end of the pillar pipe support arm 11 to the center of the support shaft. 65
By screwing in the roller 17 the support pipe support arm 1
It is provided so as not to be removed from the end portion of 1.

In the middle of the support pipe support arm 11,
When the support pipe support arm 11 is inserted into the pipe support arm insertion hole 63 of the reaction force receiver 10 up to a predetermined position, it comes into contact with the side surfaces of the vertical both side plates 64 and restricts the entrance thereof.
6 is provided, and a guide flange 67 is provided at the end of the support pipe support arm 11 so as to be separated from the locking flange 66 by a predetermined distance.

An annular member 69 provided at one end of a chain 68 is fitted and inserted into the support pipe support arm 11 between the locking flange 66 and the guide flange 67, and the other end of the chain 68 is attached. The lock type hook fitting 70 provided
The support pipe 11 is provided so that the support pipe 11 is not fitted into the pipe support arm insertion hole 63 by being locked to the bending rod 71 provided on the support pipe lifting reaction force receiver 10.

5 to 9, a chain block 16 having an operation handle 76 is fixed at a symmetrical position below the support pipe 6, and the chain block 16 is fixed.
Chain 15 for lifting the strut pipe pulled out from
Is pulled up, and the hook 7 provided at the upper end of the
4 is locked to the bending rod 71 of the reaction force receiver 10.

Further, at a position slightly above the middle portion of the strut pipe 6, a strut pipe lifting jig 18 (see FIG. 3) capable of engaging the strut pipe lifting jig 18 (see FIG. 3) mounted on the excavation bit mounting portion 13 is locked. 19 are provided diametrically through the strut pipe 6.

In the pillar pipe 6 having the above-mentioned structure, the reaction force receiving member 10 is lowered by its own weight during transportation thereof to make the stopper 5.
It is locked at 9 and stopped. Then, FIGS.
As shown in FIG. 3, the support pipe pipe is vertically supported by the support pipe lifting jig 18 attached to the excavation bit mounting portion 13 of the excavator 3, and the support pipe pipe is supported between the parallel left and right traveling rails 2. In a state where the arm 11 is rotated in parallel with the traveling rail 2, the arm 11 is lifted up to a height position substantially the same as or slightly lower than the traveling rail 2. Then, the reaction force receiving device 1 by the operator's hand
0, lift the support pipe support arm 11 to the running rail 2
The support pipe support arm 11 is rotated 90 ° at a position slightly higher than the engaging edge 75, and the lifting of the reaction force receiver 10 is released as it is. As a result, the support pipe support arm 11 is lowered, and the rollers 17 at both ends of the support pipe support arm 11 ride on the engagement edge 75 of the traveling rail 2.

At this time, the support pipe 6 is held at a desired height position by the support pipe lifting jig 18 attached to the excavator 3, and the upper end of the support pipe 6 is separated from the ceiling slab surface 1. (See Figure 7). Therefore,
In this state, the upper end of the pillar pipe 6 is still the ceiling slab surface 1
When the support pipe 6 is not lifted by the support pipe lifting jig 18, the support pipe 6 further descends by its own weight, so that the upper end of the support pipe 6 cannot contact the ceiling slab surface 1. .

Therefore, in the present invention, in this case, the operating handle 76 of the chain block 16 is operated to operate the chain 1
By shortening the length of 5, the rollers 17 at both ends of the strut pipe support arm 11 take a reaction force to the reaction force receiver 10 on the traveling rail 2, and the chain block 16 makes the strut pipe 6 larger. It can be lifted by force, and it can be lifted easily and accurately while delicately controlling the lifting operation, and the top plate 56 can be brought into smooth contact with the desired position of the ceiling slab surface 1, and the operation handle 7
Even when the hand is released from 6, the lifted state can be maintained.

As a means for lifting the support pipe 6 so that the top plate 56 of the support pipe 6 contacts the ceiling slab surface 1, it is possible to use only the support pipe lifting jig 18 mounted on the excavation bit mounting portion 13 in addition to the chain block 16. Although possible, with this method, delicate operation by the excavator 3 is difficult, and operation by the chain block 16 is easier and quicker. Therefore, in the present invention, the support pipe lifting jig 18 and the chain block 16 are combined. Used together.

Further, by operating the chain block 16,
Since the support pipe 6 can be vertically supported at an arbitrary height position so that the pipe top plate 56 is located below the ceiling slab surface 1 by a predetermined distance, the rollers 17 at both ends of the support pipe support arm 11 are for traveling. By simply pushing the strut pipe 6 lightly so that it rolls along the rail 2, the strut pipe 6 can be easily and conveniently moved along the traveling rail 2, and a flat plate loading test of the ground 4 at a plurality of points in the working chamber can be performed. Can be done quickly.

Next, the structure of the support pipe lifting jig 18 will be described with reference to FIGS. The support pipe lifting jig 18 has a distal end arm portion 72 having a mounting / dismounting portion 73 for the excavating bit mounting portion 13 at the base end, and a guide shaft 77 projects from the center of the front surface to the other end of the distal end arm portion 72. Further, a collar-shaped fixed support plate 79 having a plurality of guide arc holes 78 around the guide shaft 77 is integrally provided.

Further, the pipe lifting jig 18 has a guide hole 80 in the center and a plurality of bolt holes 81 in the peripheral portion. The guide hole 80 is inserted into the guide shaft 77 and the flange shape is also provided. The fixed support plate 79 has a collar-shaped movable support plate 82 that overlaps with the front surface of the fixed support plate 79.
8 and bolt hole 81, insert bolt 105, and
6 is concluded. Further, a base portion 84 of a support frame 83 formed by fixing grooved steel in a substantially U-shape when viewed from above is fixed to the front surface of the collar-shaped movable support plate 82, and the guide shaft 77 has a base portion 84. A locking nut 86 is screwed into the threaded portion at the tip of the guide shaft so that the base portion 84 does not come out of the guide shaft 77.

A support plate 89 having a U-groove 88 whose upper side is opened is fixed to the upper surfaces of both side portions 87 of the support frame 83. The support pipe 6 is positioned inside the support frame 83, and The locking tool 19 provided on the support pipe 6 is attached to the U groove 8
8 can be engaged. A U-groove opening / closing arm 91 is rotatably provided on the support plate 89 by an axial pin 90. The U-groove 88 is engaged with the locking tool 19 of the support pipe 6 and the opening / closing arm 91 is tilted. Close the U groove 88,
Moreover, the tip end bent portion 92 of the opening / closing arm 91 is joined to the support plate bending portion 93, and the small stopper pin 96 is inserted into the pin holes 94, 95 formed in the respective bending portions 92, 93, so that the opening / closing arm 91 is directed upward. Rotation of the support pipe 6 from the U groove 88 is restricted.
9 is provided so as not to escape unexpectedly. The tip of the chain 98 is locked to the ring body 97 at the base end of the small stopper pin 96, and the other end of the chain 98 is engaged with the locking ring 99 welded to the support frame 83, whereby the small stopper pin 96 is Is not lost.

Base end arm portion 72 of the support pipe lifting jig 18
The attachment / detachment portion 73 to / from the drill bit attachment portion 13 provided in
The recess 100 has a recess 100, and the tip of any one of the plurality of excavating bit mounting parts 13 of the excavator 3 from which the excavating bit is removed is inserted into the recess 100, and the wedge hole formed in the attaching / detaching part 73. 101 and the wedge hole 102 formed in the excavating bit mounting portion 13 are matched with each other, and the wedge 103 is driven into each of the wedge holes 101 and 102 from above, so that the pipe lifting jig 18 becomes the excavating bit mounting portion. It is structured such that it can be detachably attached to 13.

The present invention has the above-mentioned structure, and its working procedure will be described. The strut pipe 6 is carried into the working chamber 5 through a material lock (not shown) provided on the caisson ceiling slab 48. . At this time, as shown in FIG. 2, the wire rope 29A is formed by using the lifting metal fitting 29 which is temporarily fixed to the upper end of the support pipe 6 with the temporary fixing bolt 9.
Gradually hang it. After suspending the support pipe 6 in the working chamber 5, the temporary fixing bolt 9 is unscrewed from the bolt hole, and the lifting metal fitting 29 is removed from the support pipe 6.

Next, as shown in FIG. 3, the support pipe 6 is supported by the support pipe lifting jig 18 attached to the excavation bit mounting portion 13 of the excavator 3, and the excavator 3 is driven by remote control on the ground. Therefore, this support pipe 6 is shown in FIG.
Then, the excavator 3 is temporarily stopped at this position.

At this time, the chain 15 of the chain block 16 of the strut pipe 6 is loosened, and the reaction force receiver 1
0 descends and is locked to the stopper 59. At this time, since the support pipe support arm 11 is located below the traveling rail 2, the support pipe support arm 11 is rotationally displaced at this position so as to be substantially parallel to the traveling rail 2. The reaction force receiver 10 is lifted by a worker's hand, and when the support pipe support arm 11 is above the engaging edge 75 of the traveling rail 2, the support force pipe 10 and the support pipe support arm 11 are moved together with the reaction force receiver 10 at 90 degrees. And rotate this support pipe support arm 11
By slowly lowering the rollers 17 at both ends of the support pipe support arm 11 to engage the engaging edge 75 of the traveling rail 2.
Can be placed on top.

Next, the operator manually operates the operation handle 76 of the chain block 16 to move the hook 74 at the upper end.
The support pipe provided on the reaction force receiver 10 by winding the lower end of the chain 15 locked by the bending rod 71 of the reaction force receiver 10 and the rollers 17 at both ends being on the traveling rail 2 A support force is applied to the support arm 11 to lift the support pipe 6 via the chain 15. As a result, the top plate 56 of the pipe abuts the ceiling slab surface 1. Therefore, if the handle operation is stopped at this time, the state in which the upper end of the pipe abuts the ceiling slab surface 1 can be maintained. Next, as shown in FIG. 4, the hydraulic pressure jack 8 having the loading flat plate 7 is bitten between the lower end of the support pipe 6 and the ground 4, thereby completing the loading test.

Thereafter, the opening / closing arm 91 that closes the opening of the U groove 88 of the strut pipe lifting jig 18 is opened, and the lifting jig 18 is lowered to cause the locking tool 19 of the strut pipe 6 to escape from the U groove 88. Therefore, the support pipe lifting jig 18 can be moved together with the excavator 3 to a position that does not interfere with the loading test.

After that, a predetermined pressure fluid is sent to the fluid pressure jack 8 to apply a reaction force to the ceiling slab surface 1 via the strut pipe 6 to apply pressure to the loading flat plate 7 to perform a loading test at that point.

When carrying out a load test at a plurality of points, the support pipe 6 is moved to the next test point after the load test at one point is completed. In this case, after removing the fluid pressure jack 8 from the lower end of the strut pipe 6, operate the handle 76 of the chain block 16 to move the chain 15
By loosening the winding, the upper end of the pillar pipe 6 is held in a state of being slightly lowered so as to be separated from the ceiling slab surface 1.

Next, with the support pipe 6 held vertically, the support pipe 6 is pushed in the direction along the traveling rail 2 so that the rollers 17 of the support pipe support arm 11 move along the traveling rail 2. Rolling, and thus the stanchion pipe 6
Can be smoothly and easily moved to the next test point. At this point, the chain block 16 is operated again to bring the top plate 56 of the strut pipe 6 into contact with the ceiling slab surface 1, and the fluid pressure jack 8 is bitten between the strut pipe 6 and the ground 4. Carry out a load test in.

In the embodiment of the present invention, the members are assembled and separated so that each member can be easily carried in and out of the working chamber 5. However, the present invention is not limited to this structure. For example, the support pipe support arm 11 is detachably attached to the reaction force receiver main body 10A by being inserted into or removed from the pipe support arm insertion hole 63, but may be a non-attachable structure.
Similarly, the strut pipe lifting jig 18 is not limited to the structure shown in the figure, and other known lifting means may be adopted.

[0047]

As described above, according to the present invention,
When carrying out a flat plate loading test in the working room of a pneumatic caisson, the support pipe 6 of a predetermined length used in connection with the fluid pressure jack 8 can be quickly and easily specified by a small number of workers. Since it can be set in the arrangement,
It is possible to reliably meet the demand for preparing the load test with limited personnel and time. Further, since the support pipe 6 is supported via the traveling rail 2 on which the excavator 3 travels, the support pipe 6 is run along the traveling rail 2 when carrying out a load test at a plurality of points in the working chamber. By moving it, it is possible to complete the test preparation at multiple points easily and easily with a simple work.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a working chamber of a pneumatic caisson.

FIG. 2 is an enlarged front view of a support pipe, which is one of the main components of the present invention, when it is carried in.

FIG. 3 is an enlarged explanatory view showing a state where a support pipe is lifted by using an excavator.

FIG. 4 is an explanatory diagram showing a state where a flat plate loading test is performed by the device of the present invention.

FIG. 5 is a first step diagram for supporting the upper end of the strut pipe by abutting against the ceiling slab surface.

FIG. 6 is likewise a second step diagram.

FIG. 7 is likewise a third step diagram.

FIG. 8 is likewise a fourth step diagram.

FIG. 9 is a cross-sectional view of the support pipe supporting reaction force receiver, which is viewed from below and across the support pipe in the upper part.

FIG. 10 is a plan view of a reaction force receiver for supporting a strut pipe.

FIG. 11 is a side view of FIG. 10;

FIG. 12 is a front view of FIG. 10;

FIG. 13 is a plan view of a reaction force receiving device main body.

FIG. 14 is a front view of FIG.

FIG. 15 is a side view of FIG.

16 is a cross-sectional view taken along the line AA of FIG.

17 is a sectional view taken along line BB of FIG.

FIG. 18 is a partially cutaway enlarged view of a support pipe support arm.

FIG. 19 is a left end view of FIG.

FIG. 20 is a plan view before the support pipe lifting jig and the excavation bit mounting portion are connected.

FIG. 21 is a plan view after the support pipe lifting jig and the excavating bit mounting portion are connected.

22 is a side view of FIG. 21. FIG.

FIG. 23 is a plan view of FIG. 21.

FIG. 24 is an enlarged view of part C in FIG. 21.

FIG. 25 is a side sectional view of a part D in FIG. 24.

FIG. 26 is a plan view of a support pipe lifting jig.

FIG. 27 is a front view of FIG. 26;

28 is a right side view of FIG. 26.

FIG. 29 is an explanatory diagram of a conventional loading test device.

[Explanation of symbols]

 1 Ceiling slab surface 2 Traveling rail 3 Excavator 4 Ground 5 Working room 6 Strut pipe 7 Loading flat plate 8 Fluid pressure jack 10 Strut pipe lifting reaction force receiver 10A Reaction force receiver body 11 Strut pipe support arm 12 Strut pipe Pulling traction means 13 Drilling bit mounting portion 15 Chain 16 Chain block 17 Roller 18 Strut pipe lifting jig 19 Locking tool 20 Hydraulic jack 21 Beam member 22 Supporting leg 23 Pump 24 Piping 26 Strut pipe 27 Loading flat plate 28 Dial gauge 30 Anchor 31 Eyebolt 32 Lower end flange 33 Lifting chain 34 Conduit 35 Cable for measurement 36 Cable for load monitor 37 Measuring room 38 Static strain measuring instrument 39 Personal computer 40 Load control panel 41 Printer 42 Central bogie 43 Drilling bucket 44 Change Total 45 Pressure Transducer 46 Hydraulic Hose 47 Measurement Cable 48 Caisson Ceiling Slab 49 Penetration Hardware 50 Measuring Room 51 Remote Hydraulic Unit 52 Remote Hydraulic Unit Controller 53 Static Strain Measuring Instrument 54 Personal Computer 55 Printer 56 Top Plate 57 Bottom Plate 58 Grip 59 Stopper 60 Strut pipe insertion hole 61 Upper plate 62 Lower plate 63 Pipe support arm insertion hole 64 Vertical flat side plate 65 Locking screw 66 Locking collar 67 Guide collar 68 Chain 69 Ring member 70 Locking type hook metal fitting 71 Bending rod 72 Base end Arm portion 73 Attachment / detachment portion 74 Hook 75 Engagement edge 76 Operation handle 77 Guide shaft 78 Guide arc hole 79 Collar-shaped fixed support plate 80 Guide hole 81 Bolt hole 82 Collar-shaped movable support plate 83 Support frame 84 Base 85 Shaft hole 86 Lock Nut 87 Both sides 88 U groove 8 9 Support plate 90 Axial pin 91 U-groove opening / closing arm 92 Tip bending part 93 Support plate bending part 94 Pin hole 94 Pin hole 96 Small stopper pin 97 Ring body 98 Chain 99 Locking ring 100 Recessed part 101 Wedge hole 102 Wedge hole 103 Wedge

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masayuki Ikeda 2935 Yanoguchi, Inagi City, Tokyo (72) Inventor Akihiro Matsuno 3-10-21 Izumidai, Ageo City, Saitama Prefecture Inventor Shoji Oda 4 Ichinoe Edogawa-ku, Tokyo Chome 13-9 (72) Inventor Tetsuya Nakanishi 73-15, Heisei-cho, Matsuzaka City, Mie Prefecture (72) Inventor Koji Sato Ami Prefecture, Kaito-gun Yatomi-cho, Satoki Nitta-type 424 (72) Inventor Kazuhide Izumi Aichi 77-2-6 Hachimajo, Yuji, Onishi City, Iwata (72) Inventor Tetsuo Iwata 39-2 Shimoguchi, Yamato-cho, Yamato-machi, Ichinomiya-shi, Aichi (72) Riki Sato 1 Tango-cho, Nakagawa-ku, Nagoya-shi -25 (72) Inventor Manabu Kasahara 2-27 Osoyanagicho, Gifu City, Gifu Prefecture (27) Nobuhiro Higuchi 48-3 Hodeno Town, Kuwana City, Mie Prefecture

Claims (4)

[Claims] 1. A support pipe in a working room 5 of a pneumatic caisson for excavating the ground 4 by an excavator 3 which travels along parallel traveling rails 2 which are paired and fixed to a ceiling slab surface 1. The upper end of 6 abuts on the ceiling slab surface 1, the loading flat plate 7 and the fluid pressure jack 8 are interposed between the support pipe 6 and the ground 4, and the fluid pressure jack 8 is extended.
In the flat plate loading method in which a load test is performed by taking a reaction force to the ceiling slab surface 1 via the support pipe 6, the support pipe 6 is lifted by an appropriate lifting means, and the upper portion thereof is positioned between the pair of traveling rails 2. And vertically arranged. At this time, the pillar pipe support arm 11 of the pillar pipe lifting reaction force receiver 10 provided on the pillar pipe 6 so as to be vertically movable and rotatable within a predetermined range is parallel to the traveling rail 2. In addition, the reaction force receiver 10 is lifted, the support pipe support arm 11 is rotated by a predetermined angle and pulled down again, so that both ends of the support pipe support arm 11 are placed on the traveling rail 2. The upper part of the pillar pipe 6 is brought into contact with the ceiling slab surface 1 by operating the pillar pipe pulling pulling means 12 stretched between the reaction force receiver 10 and the pillar pipe 6, and lower end Flat loading method characterized by interposing a hydraulic jack 8 for loading between the ground 4. 2. The pulling means 12 for pulling up the support pipe.
Is constituted by a chain block 16 in which the tip of the chain 15 is locked to the reaction force receiving device 10 and fixed to the support pipe 6, and the chain block 16 is operated to move the upper end of the support pipe 6 from the ceiling slab surface 1. The flat plate according to claim 1, wherein the rollers 17 at both ends of the support pipe support arm 11 are rolled down along the traveling rail 2 to move the support pipe 6 to another loading point after being slightly lowered. Loading method. 3. A support pipe lifting jig 1 in which a lifting means for the support pipe 6 is provided in an excavation bit 13 of an excavator 3.
8. The flat plate loading method according to claim 1 or 2, wherein the flat plate loading method comprises: 4. In a working room 5 of a pneumatic caisson for excavating the ground 4 by an excavator 3 that travels along a traveling rail 2 that is fixed to the ceiling slab surface 1 in pairs,
Abut the upper end of the pillar pipe 6 to the ceiling slab surface 1,
In the flat plate loading device in which the loading flat plate 7 and the fluid pressure jack 8 are interposed between the support pipe 6 and the ground 4, and the fluid pressure jack 8 is extended to perform a loading test, the support pipe 6 is attached to the support pipe 6. A column pipe lifting reaction force receiver 10 having column pipe support arms 11 that are vertically movable and rotatable in a predetermined range along the traveling rail 2 and that can engage both ends of the traveling rail 2, and an excavator 3 Locking device 19 for locking the support pipe lifting jig 18 provided in the
A structure is provided in which a chain 15 that locks one end to 0 and the other end to the support pipe 6 and a support pipe pulling means 12 including means for winding the chain 15 in a direction to shorten the chain 15 are provided. Flat plate loading device.