JP7185667B2 - Press bar for open shield method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press bar used in an open shield construction method for constructing underground structures such as water supply and sewerage systems and underpasses in urban areas.

The open shield construction method combines the advantages of both the open cut construction method and the shield construction method, and uses excavators with openings at the top and front and rear ends. A propulsion jack is installed inside the excavator to excavate and remove the earth and sand from the face through the front end and upper opening of the excavator, extend the propulsion jack, and use the underground structure made of concrete box to receive the reaction force. Move the excavator forward. Next, the propulsion jack is retracted, a new underground structure is lowered inside the excavator, this new underground structure is set in front of the underground structure, and the face is opened from the front end and upper opening of the excavator. The earth and sand are excavated and discharged, the propulsion jack is extended, and the new underground structure and the underground structure following it receive the reaction force to move the excavator forward.

In this way, the process of excavation, advancement, and installation of underground structures is repeated to move the excavator forward. As with the shield construction method, construction is simpler than the shield construction method, and like the shield construction method, the inside is protected by the excavator against the collapse of earth and sand, so the earth retaining work, etc. in the open-cut construction method is not required. be.

As described in the patent document below, a press bar (push angle) is used as a water stoppage device for an excavator used in the open shield construction method. There is a thing that can be diameter.
JP-A-4-302618

As shown in FIGS. 13 and 14, a press bar ( push angle) 11 (push angle 16 in Patent Document 1) is made of H-shaped steel, box steel, or the like. are combined to form a rectangular frame body, of which giraffe jacks 12 are disposed as diameter expansion jacks in the middle of the upper and lower horizontal members 16a and 16b so that the entire frame can be expanded in the horizontal direction. and

Further, the press bar (push angle) 11 is provided with plate-shaped elastic plates such as rubber plates on the outer surfaces of the left and right vertical members 16c and 16d and the lower horizontal member 16b, that is, the surfaces on the side that come into contact with the inner peripheral surface of the shield machine. A sealing material 13 was attached.

A press bar 11 also provides a detachable seal around giraffe jacks 12 of the lower cross member 16b for water stoppage. As a means for performing this sealing, a waterproof member such as a sponge may be stuffed after the widening. The giraffe jack 12 is covered with a U-shaped lid 14 as a sealing member.

As shown in FIG. 15, a press bar (push angle) 11 is disposed between the open shield propelling jack and the concrete box suspended in the tail of the open shield machine so that it can be pulled in and out freely. The propelling jack is the press bar ( 11 , the propelling jack is extended to move the open shield machine forward using the concrete box as a reaction force.

As the open shield machine advances in this manner, the concrete box remains in place. If you shorten the propulsion jack after moving forward, a space will be created in front of the concrete box in the front row by the amount of forward movement, so a new concrete box will be hung and set here, and grout will be applied around it.

When the thrust jack is brought into contact with the press bar (push angle) 11 and a slight pressing force is applied thereto, the press bar (push angle) 11 is fixed in that state. The press bar (push angle) 11 has a reduced diameter before it is lowered, and the giraffe jack 12 is adjusted in the open shield machine to widen the width so that the outer circumference is watertight with the inner circumference of the open shield machine through the plate-shaped sealing material 13. , the press bar (push angle) 11 prevents the grout material from flowing out to the front side of the open shield machine.

In the case of expanding the width or reducing the expanded width by manipulating a giraffe jack, as in the case of the push angle of Patent Document 1, the work lacks speed.

In addition, since the upper and lower giraffe jacks are fixed to the horizontal member of the press bar, if the upper and lower giraffe jacks are not operated equally, the entire rectangle may be distorted and the giraffe jacks may be damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press bar for an open shield construction method that eliminates the disadvantages of the conventional example, reduces the possibility of damage to the jack of the movable part, and can be widened easily and quickly in a stable state. That's what it is.

In order to achieve the above object, the present invention according to claim 1 provides a press bar for open shield construction, which is formed by combining left and right vertical members and horizontal members, in which the horizontal member is divided in the middle and one end of the divided body is is reduced in diameter and inserted into the end of the other split body to form a telescopic structure. The gist is that it has been established.

According to the present invention of claim 1, in the press bar for the open shield construction method formed by combining the left and right vertical members and horizontal members, the upper and lower horizontal members are divided in the middle, and the end of one divided body is shortened. Since it has a telescopic structure by diametrically inserting it into the end of the other divided body, there is no jack placed in the movable part that expands and contracts, which is a weak point against distortion, so the possibility of damage to the jack is reduced, The left and right vertical members can be stably widened by pressing jacks.

The gist of the second aspect of the present invention is that the pressing jack is detachably arranged by providing a jack shelf.

According to the second aspect of the present invention, the pressing jack is installed when necessary so that it does not interfere with assembly and disassembly of the press bar. Furthermore, when workers come and go between the inside of the open shield machine and the inside of the concrete box, the members do not interfere with the press bar. In addition, the pressing jack does not become a hindrance when pulling with a pulling device using a lever block (registered trademark).

The gist of the present invention according to claim 3 is that the left and right vertical members are connected to each other in the middle by a drawing device using a lever block.

According to the third aspect of the present invention, widening of the width can be quickly performed by drawing the left and right longitudinal members together by a drawing device such as a lever block. Also, to reduce the size, the pressing jack is set to a free state.

As described above, the press bar for the open shield construction method of the present invention reduces the possibility of breakage of the jacks of the movable parts, and can be expanded easily and quickly in a stable state.

1 is a front view of the first embodiment of the press bar for the open shield construction method of the present invention when the width is reduced; FIG. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view of the first embodiment of the press bar for the open shield construction method of the present invention when the width is widened; It is a longitudinal side view at the time of press bar widening of the open shield machine which shows 2nd Embodiment of the press bar for open shield construction methods of this invention. It is a center vertical cross-sectional view of the press bar of the open shield machine showing the second embodiment of the press bar for the open shield construction method of the present invention when the press bar is widened. FIG. 10 is a cross-sectional plan view of the open shield machine showing the second embodiment of the press bar for the open shield construction method of the present invention when the press bar is widened. FIG. 5 is a plan view of the open shield machine when expanding the width of the press bar, showing the second embodiment of the press bar for the open shield construction method of the present invention. FIG. 7 is a cross-sectional view taken along line AA of FIG. 6; It is a longitudinal side view of the open shield machine when the press bar is contracted, showing a second embodiment of the press bar for the open shield construction method of the present invention. It is a central vertical cross-sectional side view of the open shield machine when the press bar is contracted, showing the second embodiment of the press bar for the open shield construction method of the present invention. Fig. 10 is a cross-sectional plan view of the open shield machine when the press bar is contracted, showing a second embodiment of the press bar for the open shield construction method of the present invention; FIG. 5 is a plan view of the open shield machine when the press bar is contracted, showing a second embodiment of the press bar for the open shield construction method of the present invention. FIG. 12 is a cross-sectional view taken along line AA of FIG. 11; It is a front view showing a conventional example. FIG. 11 is a perspective view showing a conventional example; It is a side view of an open shield machine advance process which shows the outline of an open shield construction method. It is a side view at the time of concrete box hanging down which shows the outline of an open shield construction method.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view showing one embodiment of the press bar for the open shield construction method of the present invention when the width is reduced, and FIG. 2 is a front view when the width is expanded.
As with the press bar (push angle) 11 , a rectangular frame is formed by combining upper and lower horizontal members 20, 21 and left and right vertical members 18, 19 made of H-shaped steel, box steel, or the like.

The upper and lower horizontal members 20 and 21 are divided in the middle to form a combination of divided bodies 20a and 21a and divided bodies 20b and 21b. 21c is formed, and this is inserted into the fitting holes formed at the ends of the other split bodies 20a, 21a to form an expansion/contraction structure.

Support plates 20e and 21e are fixed on the one divided body divided bodies 20a and 21a and the other divided bodies 20b and 21b, respectively. On the jack shelf 26 above the telescopic structure of the inserting parts 20c and 21c, a widening device by a pressure jack 22 with a hydraulic jack or a water pressure jack is installed, and the pressure plate 20e and 21e by the bearing flange is installed. The vertical members 18, 19 on the right and left sides can be widened.

The pressing jack 22 is detachably installed on the jack shelf 26 by bolting or the like, and can be removed as necessary.

The pressing jack 22 is formed with bearing flanges 20d, 21d, 20e, and 21e on the divisions 20a, 21a and divisions 20b, 21b and disposed therebetween.

In addition, the hook of the lever block 24 is fixed to a hooking jig 27 with a holed flange arranged halfway inside the left and right vertical members 18 and 19, and the left and right vertical members 18 and 19 are connected by a drawing device using the lever block 24. The widened width can be reduced.

A plate-like sealing material 25 made of compression rubber is pasted on the outer sides of the left and right vertical members 18 and 19 .

Next, I will explain how to use it. First, I will explain the open shield construction method. This is a construction method that uses an open shield machine to propel the structure and prevent landslides while installing the box inside.

15 and 16 schematically show an open shield machine 1, which consists of left and right side wall plates and a bottom plate connected to these side wall plates, and is open at the front, rear and top surfaces. .

The fuselage of the open shield machine 1 is divided into a plurality of parts in the longitudinal direction, and the front end of the rear fuselage as the tail part 1b is fitted into the rear end of the front fuselage as the front part 1a. A bent part 2 is formed so that it can be bent.

The front part 1a is mainly used for excavation, and has an open front end and an upper surface. Inside the fuselage, a half-folding jack (not shown) is placed on the left and right toward the rear toward the rear, and is arranged in multiple stages up and down. did.

On the other hand, the tail part 1b is for installing a concrete box 4, and has a bottom plate 5. A propulsion jack (shield jack) 3 is moved left and right toward the front and rearward in the fuselage, and also up and down. It is arranged in multiple stages.

In the figure, 6 is a slide retaining plate provided at the front end of the front portion 1a, and 11 is a press bar (push angle) of the present invention.

Although not shown, the open shield machine 1 is installed in the starting shaft, the propelling jack 3 of the open shield machine 1 is extended, and the reaction force is applied to the reaction wall in the starting shaft to move the open shield machine 1 forward. Then, the first concrete box 4 forming the underground structure is suspended from above by a lifting machine 10 such as a crane, and set behind the retracted propulsion jack 3 in the tail 1b of the open shield machine 1. - 特許庁

An excavator 7 such as a shovel excavates and discharges earth and sand from the front or top surface of the open shield machine 1.例文帳に追加Simultaneously with or after this earth discharging process, the propelling jack 3 is extended to advance the open shield machine 1. - 特許庁

Then, the second concrete box 4 is lowered into the tail portion 1b of the open shield machine 1 in front of the first concrete box 4. As shown in FIG. Thereafter, the same earth-discharging process, forwarding process, and setting process of the concrete box 4 are repeated as appropriate, and the concrete boxes 4 are successively left in the ground in tandem as the open shield machine 1 advances. Backfill the upper surface of 4.

In addition, when suspending the concrete box 4 into the tail portion 1b of the open shield machine 1, a height adjusting material such as a concrete block is arranged under the concrete box 4, and the concrete box 4 is placed in the tail portion 1b. The gaps on the left, right, and bottom of the box 4 are filled with a backfilling injection material 9 using a quick-setting grout material for primary injection, and after the open shield machine 1 moves forward, secondary injection is performed to the concrete box. A backfilling injection material 9 is injected from the inside of 4 to the outside through the grout hole.

In this way, when the open shield machine 1 reaches the arrival pit, it is removed to complete the construction work.

Before moving the open shield machine 1 forward, the press bar 11 is suspended between the propulsion jack 3 and the front end of the concrete box 4, and the width is widened by the pressing jack 22 so that the outer circumference becomes the inner circumference of the open shield machine 1. They are arranged so as to be in watertight contact with the plate-like sealing material 25 interposed therebetween.

When the thrust jack 3 is brought into contact with the longitudinal members 18, 19 of the press bar 11 and a slight pressing force is applied thereto, the press bar 11 is fixed in that state.

After placing the press bar 11 , the gap around the concrete box 4 is filled with the grout material 9 , but the press bar 11 prevents the grout material 9 from flowing out to the front part of the open shield machine 1 .

The propulsion jack 3 is extended to move the open shield machine 1 forward using the concrete box 4 as a reaction force.

After that, the press bar 11 is pulled upward, but in order to reduce the widened width of the press bar 11, the pressing jack 22 is removed, and the left and right vertical members 18 and 19 are pulled together by the lever block 24.例文帳に追加

DESCRIPTION OF SYMBOLS 1... Open shield machine 1a... Front part 1b... Tail part 2... Folding part 3... Propulsion jack 4... Concrete box 5... Bottom plate 6... Slide retaining plate 7... Excavator 8... Folding jack 9... Backfill injection material DESCRIPTION OF SYMBOLS 10... Lifting machine 11... Press bar 12... Giraffe jack 13... Plate-shaped sealing material 14... Lid 15... Hydraulic jack 17... Hook jig 16a, 16b... Horizontal member 16c, 16d... Vertical member 18, 19... Vertical member 20, DESCRIPTION OF SYMBOLS 21... Horizontal member 20a, 21a... Divided body 20b, 21b... Divided body 20c, 21c... Insert part 20d, 21d... Bearing flange 20e, 21e... Bearing plate 22... Pressure jack 23... Horizontal member 24... Lever block 25... Plate Shaped sealing material 26 ... Jack shelf 27 ... Hanging jig

Claims (3)

In the press bar for the open shield construction method, which is formed by combining the left and right vertical members and horizontal members, the horizontal member is divided in the middle, and the end of one divided body is reduced in diameter and inserted into the end of the other divided body. A press for an open shield construction method, characterized in that it has a telescopic structure with a support plate fixed on each of the one divided body and the other divided body , and a pressing jack is provided between the support plates. bar. 2. The press bar for the open shield construction method according to claim 1, wherein the pressing jack is detachably arranged by providing a jack shelf. 3. A press bar for an open shield construction method according to claim 1 or claim 2, wherein the left and right vertical members are connected to each other in the middle by means of a pulling device using a lever block.

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