KR101003035B1 - Method of manufacturing synthetic segment for shield - Google Patents

Abstract

PURPOSE: A method for manufacturing a synthetic segment for shield is provided to mold the synthetic segment by centrifugation. CONSTITUTION: A method for manufacturing a synthetic segment for shield comprises: a step of preparing cylindrical frame(2) containing steel inside; a step of placing the frame in an axial direction; a step of rapidly rotating a rotator; a step of pouring concrete into the inside of the frame; and a step of molding synthetic segment having the frame.

Description

Method of manufacturing synthetic segment for shield

The present invention relates to a method for producing a composite segment for shields used for constructing pipelines or tunnels in the ground according to the shield method.

The shield method, which is known as a method for constructing pipelines or tunnels in the ground without a digging from the ground, is used to build a pipeline by sequentially repeating excavation by an excavator and segment assembly at the rear thereof. will be.

The segment used in the shielding method as described above has a structure in which a cylindrical body having a predetermined internal diameter is divided into a plurality of parts along the circumferential direction, and brought into the rear of the excavator in a divided state and the cylinder at the rear of the excavator. To form a shield ring, and to build a pipeline by repeating the assembly of the shield ring, and the excavation of the excavator using the connection as a reaction force.

Conventionally, the method for manufacturing a shielding segment is, for example, when manufacturing a segment for assembling a shield ring having a finish inner diameter of 1500 mm, first, according to a design of determining the width, height (thickness) and number of divisions of the segment. The formwork for segments of steel materials which has a structure which divided the cylinder into multiple numbers is manufactured.

Then, the reinforcing bars are assembled in the formwork, the flowable concrete is poured into the formwork, the concrete is cured by vibrating the formwork, and the segment is obtained by demolding after the curing of the concrete. Since one segment ring is manufactured by a set of formwork, in order to increase efficiency, 5 to 10 sets of formwork are usually prepared, and used formwork is discarded.

However, the conventional method of forming by vibration manufactures the segment formwork according to the ordering order of the orderer, so that not only does the segment formwork cost occur, but also the price per one shield ring varies according to the number of segment manufactures ordered. There was a problem.

In addition, assembling or dismantling the segment formwork requires a manpower, which increases the cost. Furthermore, manufacturing of the segment formwork requires several millimeters of manufacturing precision, making it difficult to manufacture technically. There was a phenomenon.

Accordingly, the present invention has been conceived from a fume pipe manufacturing apparatus widely used in the manufacture of propulsion pipes, and by using a fume pipe manufacturing apparatus, it is possible to form a synthetic segment by centrifugal force, thereby enabling effective use of the fume pipe manufacturing apparatus. In addition, the present invention provides a method for producing a shielded synthetic segment that can efficiently manufacture a synthetic segment having excellent quality, thereby reducing manufacturing costs.

In order to solve the above problems, the present invention has a thickness of 6 to 9mm on the rim of the fume pipe manufacturing, and four edges of the back plate having a thickness of about 3 to 4mm by dividing a plurality of cylinders along the main direction. A cylindrical frame of degree is provided, and a plurality of frame frames are detachably coupled to the inside of the rotor for manufacturing fume pipe by using a frame frame for assembling a plurality of cylindrical frame rings in a cylindrical shape. A plurality of frame frames arranged in the axial direction are assembled and assembled, and a cornering body is positioned between the fixing ring body between adjacent frame frame rings and the frame end rings positioned at both ends in the rotor body for manufacturing the fume pipe. The fixed ring body, the cornering body and the frame frame are arranged in a detachable bolted state, and in this state, the frame frame of each frame ring is rotated together with the rotating body. Pour the litter to adjust the inner diameter of the concrete layer to the inner diameter of the fixing ring and cornering body, and simultaneously cut the composite segment having a plurality of frames by axially cutting the concrete layer at a position between adjacent frames after solidification of the concrete layer. It was made to be molded.

A circumferential joint groove is formed on the inner circumferential side surfaces of the fixing ring on a circumferential joint groove forming protrusion protruding toward the inside of the frame ring, and the circumferential joint groove is formed on the concrete layer of the segment having a molded frame. And forming the axial joint groove in the concrete layer of the segment having the frame by cutting the concrete layer in the axial direction at the position between the adjacent frame after the molding.

The frame frame is provided with a cylindrical post-fill material injection hole protruding on the inner surface side of the back plate, and closes the inner end of the injection hole with a rubber cap, so that the end of the rubber cap coincides with the inner diameter finishing surface height of the concrete layer. have.

When the frame frame has a circumferential frame formed at four edges of the arcuate backboard, the frame ring, the fixed ring body, and the cornering body and the rotating body are assembled when the frame ring, the fixed ring body, and the cornering body are assembled into the rotating body for manufacturing a fume pipe. By constructing the elastic mat partially at intervals occurring at the inner circumference of the edge, integration with the rotating body can be achieved.

In addition, when assembling the shield ring in a segment having a plurality of divided frame frames, the mutual coupling of adjacent segments uses a U-shaped pin, and at the end of the circumferential frame along the circumferential direction of the segment having the frame frame. The U-shaped pins are inserted into the pin holders to be coupled to each other, and the axial coupling of the assembled shield ring comprises a plurality of parachute-type pins protruding in one axial cross section of the segment having the frame frame. It is press-inserted into the pin hole with the release preventing groove provided at the other end in the direction, and the pin tip is openly coupled in the pin hole, so that the assembly of the shield ring and the connection of the shield ring can be made without bolts.

Here, the frame is a steel material formed in a rectangular frame formed around an arcuate plate, and has a structure in which reinforcing bars are welded therein, and a frame frame of a pair is assembled through a rubber plate inside the rotating body. The cylindrical frame rings are assembled by detachably joining both sides of each frame with U-shaped pins.

In this way, a plurality of frame rings are assembled in the inner axial direction of the rotating body, the fixing ring bodies are disposed between adjacent frame frames, and the cornering bodies are arranged at the outer ends of the frame frames located at both ends. RC segment is manufactured by pouring concrete into the frame frame while rotating the rotary furnace and forming concrete by centrifugal force.It is possible to simultaneously produce a plurality of RC segments with high roundness accuracy with one inner process whose finish is equivalent to that of a fume pipe. do.

According to the present invention, a plurality of frame rings in which a cylindrical frame is divided into a plurality of frame frames in a circumferential direction are assembled in an inner circumference of a rotating body for manufacturing a fume pipe, and the rotating body is rotated within the frame. By pouring concrete, segments with frames are molded by centrifugal method, so that synthetic segments can be manufactured in a short time as well as fume pipes. Furthermore, like fume pipes, excellent roundness precision, smooth inner circumferential surfaces and excellent roughness coefficients are achieved. A plurality of segments can be obtained at the same time, and the total cost of segment manufacturing can be reduced by improving the efficiency.

In addition, since the composite segment has a steel frame structure on the outside, it is possible to protect the periphery of the concrete part, and the product does not generate defects in the corner part, or body rupture due to pressure, which has been occurring in the field so far. Not only this, but also by centrifugal molding, the compressive strength reaches nearly twice that of the conventional segment, so that the mold height (thickness) can be made thin.

In addition, by using the rotor of the fume pipe manufacturing apparatus for the production of the composite segment, it is possible to effectively use the fume pipe manufacturing apparatus already used by the fume pipe manufacturing apparatus can improve the operating efficiency of the fume pipe manufacturing apparatus.

Fig.1 (a) is a perspective view of the frame frame single body used for formation of a composite segment, (b) is a front view of the frame ring which joined and assembled several frame frame.
FIG. 2 (a) is a perspective view of a frame ring assembled by combining a plurality of frame frames, and (b) is a longitudinal cross-sectional view showing a state in which a composite segment is formed by assembling a plurality of frame rings to a centrifugal rotating body. to be.
3 is an exploded perspective view showing the relationship between a plurality of frame rings and a centrifugal rotating body.
(A) is an enlarged cross-sectional view showing the relationship between the frame ring and the stationary ring body assembled to the centrifugal rotating body, and (b) shows the relationship between the frame ring and the cornering body assembled to the centrifugal rotating body. It is an enlarged cross section.
Fig. 5 is a longitudinal front view of the centrifugal molding apparatus showing a state where the synthetic segments are centrifugally molded.
(A) is a perspective view of the completed synthetic segment single body, (b) is an expanded sectional view which shows the state at the time of shaping | molding of the post-fill material injection hole part provided in the composite segment, (c) is a post-fill material which removed the rubber cap. An enlarged sectional view of the injection hole with a ground cap and a non-return valve installed.
Fig. 7A is an exploded perspective view showing an axial connection portion of a shield ring in which a composite segment is assembled, (b) is an enlarged sectional view showing the structure of the axial connection portion, and (c) is an axial connection. It is an exploded perspective view of the parachute pin used for a part.
Fig. 8 is an enlarged cross-sectional view showing a connecting portion of a U-shaped pin for circumferentially connecting the frame ring and the composite segment.
Fig. 9A is an enlarged cross-sectional view of the seal structure with respect to the axial joint groove at the connecting portion of the composite segment, and (b) is an enlarged cross-sectional view of the seal structure with respect to the circumferential joint groove at the shield ring connecting portion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 9, the shielding composite segment 1 includes a steel frame 2, a concrete layer 3 formed inside the frame 2, and a concrete layer 3. Is formed by reinforcing bars 4 embedded in the shell, and in the present embodiment, the composite segment 1 has a cylindrical, for example, four or six-split structure, and the four composite segments 1a, 1b, By combining 1c, 1d) sequentially, one shield ring is assembled.

The frame frame 2 has a rectangular backboard 2a having an arc-shaped thickness of about 3 to 4 mm, and a thickness from the four edges of the backboard 2a to the curved surface side. A circumferential frame 2b having a thickness of ˜9 mm is provided and formed, and the indentation recess 6 of the U-shaped pin 5 is machined at four corners of the circumferential frame 2b, and a plurality of portions located in the axial direction are provided. The connection hole 8 of the I-shaped pin 7 and the connection bracket 9 of the I-shaped pin 7 are provided in the inside, and the inside of this frame 2 is shown in FIG. Reinforcing bars 4 are welded in the circumferential direction and the axial direction.

FIG. 5 shows a centrifugal molding apparatus for manufacturing the composite segment 1 using the frame frame 2 as described above, in which a plurality of rotating rollers 11 are horizontally equilibrated on the base 10 at predetermined intervals. It arrange | positioned, and supports the cylindrical rotating body 12 which becomes a bipartition structure for centrifugal molding between the adjacent rotating rollers 11, and rotates the rotating body 12 through the rotating roller 11 with a drive motor. At the same time, the plurality of frame rings 2c are assembled in the inner axial direction of the rotating body 12 and rotated while concrete is put into the frame 2 of each frame ring 2c. By rotating the whole 12 at high speed, the concrete layer 3 is formed by centrifugal force, and a plurality of shield rings can be produced simultaneously.

When assembling the frame ring 2c in the rotating body 12, the stationary ring body 13 is disposed between the adjacent frame ring, and the cornering body 14 at the outer end of the frame ring located at both ends. Is disposed, and the elastic mat 15, such as rubber, is partially constructed at intervals generated between the inner circumferential surface of the rotating body 12 and the frame ring or the fixing ring body 13, thereby rotating the rotating body 12 and the frame frame. The ring and the stationary ring body 13 are integrated.

As shown in FIG. 4A, the fixing ring body 13 is provided with a pair of outer circumferential circular walls 13a of the outer diameter accommodated in the rotating body 12 and opposed to both sides of the circular circumferential wall 13a. It has a cross-sectional shape consisting of an annular wall 13b. The frame 2 is joined by a bolt 16 screwed to the connecting bracket 9 of the I-shaped pin 7 so that the inner circumference of the annular wall 13b is the inner circumferential finishing surface 13c of the concrete layer 3. )

On the inner circumferential sides of the annular walls 13b of the fixing ring 13, the projection 17 is provided over the entire circumferential direction on the engaging side surface with the frame 2, and the circumferential frame provided on the frame 2 ( The inner circumference of 2b) is accommodated in the outer circumference of the protrusion 17. Accordingly, the inner circumference of the concrete layer 3 is finished in a state of protruding from the inner circumference of the circumferential frame 2b, so that the protrusion 17 is a joint groove 18 along the circumferential direction with respect to the concrete layer 3. ).

The cornering body 14 overlaps the outer end of the frame 2 with the annular wall 14a which overlaps with the inner peripheral surface of the rotating body 12 and is fixed with the bolt 19, as shown in FIG.4 (b). The cross section is formed in an L shape by a circular circumferential wall 14b coupled by a bolt 20 that is screwed to the connecting frame 9 of the frame frame 2 and the I-shaped pin 7. The inner circumference of 14b) becomes the inner circumferential finishing surface 13c of the concrete layer 3, and the circular circumferential wall 14b is on the inner circumferential side with the joining side with the frame 2 on the inner circumferential side. It is provided so that this protrusion 17 may form the joint groove 18 along the circumferential direction with respect to the concrete layer 3.

Here, the ground injection hole 22 and its injection cylinder 23 are provided in the back board 2a of the frame frame 2, and this injection cylinder 23 is rubber | gum like FIG.6 (b). It is closed so that opening and closing with the cap 24, the cross section of the rubber cap 24 is the same as the inner peripheral finishing surface of the concrete layer (3).

Next, a method for producing a synthetic segment using the centrifugal molding apparatus will be described.

As shown in Figs. 2B, 3, and 4, the plurality of frame frames 2 are joined by the U-shaped pins 5 in the rotor 12 having a bi-divided structure along the axis. Assembling the cylindrical frame frame 2c, arranging a plurality of the frame ring 2c in the axial direction, and arranging the fixing ring body 13 between the adjacent frame frame rings 2c, (13) and the frame frame 2 are joined by bolts 16, and the cornering body 14 is disposed at the outer ends of the frame ring 2c located at both ends, and the cornering body 14 is rotated. 12) and bolts 19 and 20 to the frame frame 2 so that each frame ring 2c can be integrally rotated with respect to the rotating body 12 after assembly.

Subsequently, in a state in which the rotating body 12 is horizontally supported by the rotating roller 11 as shown in FIG. 5, the fluidity is introduced into the frame 2 of each frame ring 2c while the rotating body 12 is rotated. Pour the concrete, and finish the inner circumference with a long trowel (gote) on the basis of the inner circumferential surfaces of the fixing ring body 13 and the cornering body 14, and dehydrated and hardened by centrifugal force by high-speed rotation. Complete 3).

The concrete input into each frame ring (2c) is poured about 1/3 of the thickness of the flowable concrete with a conveyor while rotating the rotor 12 at high speed, and hardened by centrifugal force molding by high speed rotation , Pour about 2/3 of the remaining concrete in two separate portions. By dividing and curing the concrete in this way, it is possible to reliably fill concrete even at the corners of the frame 2 to eliminate the generation of space, and to cure the concrete by centrifugal force by high-speed rotation, so that the quality is excellent in only 120 minutes. It is possible to manufacture a plurality of segment rings at the same time.

In addition, by employing centrifugal force molding to form the composite segment 1, the frame 2 is finished simultaneously with the propulsion tube, has excellent roundness, no distortion, and the inner circumferential surface of the concrete layer 3 is smooth. The composite segment 1 with) can be molded. Then, when the stationary rotating body 12 is separated up and down and the composite segment 1 is taken out, for example, three segment rings can be manufactured simultaneously in one process.

After simultaneously forming a plurality of segment rings as described above, after curing the concrete layer 3, the cornering body 14 is taken out from the rotating body 12 and the frame 2, and the rotating body 12 is divided. The fixed ring body 13 is taken out from between the adjacent segment rings, and the connecting portion of each frame frame 2 adjacent to the inner circumference of the concrete layer 3 in each segment ring is formed by using a cutter having a thickness of about 10 mm. Direction to separate the concrete layer 3, thereby forming joint grooves 25 on both sides of the inner axial direction in the concrete layer of the composite segment 1, after which the segment rings are U-shaped pins. By taking out (5), the synthetic segment 1 divided into four is completed.

The composite segment 1 thus produced is used for constructing the pipeline by the shield method, and carries in the composite segment 1 partitioned inside the shield cylinder unit disposed at the rear of the excavator and stretches the propulsion jockey. The segmenting by repeating the advance of the excavator which makes the segment ring embedded in the ground reaction as a reaction force, the segmenting assembly in the shield cylinder unit, and connecting the assembled segment ring to the end of the segment ring embedded in the ground. The pipeline is being built underground.

Here, when assembling the segment ring by connecting the compound segments 1, the axial joint grooves at the connecting portions of the compound segments are watertightly treated with a seal member 28 as shown in FIG. The circumferential joint groove generated at the connecting portion of the shield ring when connected in the direction is watertightly treated with the seal member 29 as shown in FIG.

Fig. 8 shows U-shaped pins in the recessed recess 6 which is a pin holder provided in the frame 2 when assembling a set of composite segments 1 by cylindrical segment ring in constructing a pipeline by the shield method. (5) is penetrated into a cylindrical shape, and the axial coupling of the segment ring is a parachute type I-shaped pin shown in (c) of FIG. 7 in the connection bracket 9 provided on one side of the frame frame 2 in the axial direction. (7) is screwed into the axial direction by inserting the tip side of the I-shaped pin (7) in the connecting bracket (9) having a pin hole with a release prevention groove provided on the other side in the axial direction of the frame (2) By pressurizing, the tip end side of the I-shaped pin 7 is enlarged in the connecting bracket 9 and connected.

The assembly of such segment rings and the axial connection of the segment rings are holderless, and the constructed conduits have the advantage that the inner surface finish is completely unnecessary.

The joint groove 25 along the axial direction generated between each of the composite segments 1 by the assembly of the segment ring and the circumferential joint groove 18 formed between the adjacent segment rings are sealed as shown in FIG. By embedding (28,29), it is buried and the watertightness of the inner peripheral surface is maintained.

In addition, in the case of injecting the post-fill material into the outer circumference of the segment ring located in the ground, as shown in FIG. 6 (b), the injection cylinder 23 closed by the rubber cap 24 at the time of molding is shown in FIG. After removing the rubber cap 24, the ground cap 26 and the check valve 27 are mounted, and the post-filling material is introduced from the injection container 23 through the check valve 27 toward the outer circumference of the segment ring. Inject it.

1..Synthetic segment 2..Frame frame 3..Concrete layer
4. Rebar 5. U-shaped pin 6. Indent groove
7. I-shaped pin 8. Connecting hole 9. Connecting bracket
10. Base 11. Rotating roller 12. Rotating body
13 .. Retaining ring body 14. Corner ring body 15. Elastic mat
16. Bolt 17. Stone 18. Joint groove
19. Bolt 20. Bolt 21. Stone
22..injection 23..injection 24..rubber cap
25. Joint groove 26. Ground cap 27. Reverse check valve
28. Seal material 29. Seal material

Claims (5)

A circumferential frame is provided at four edges of a fume pipe manufacturing rotor and a back plate in which a cylinder is divided into a plurality of cylinders along a circumferential direction, and a frame frame for assembling a plurality of cylindrical frame rings is used. ,
Inside the rotor for manufacturing a fume pipe, a plurality of frame frames are assembled in a axial direction by assembling a plurality of frame frames detachably coupled with U-shaped pins in the axial direction.
In the inside of the fume pipe manufacturing rotor, a fixing ring body between adjacent frame frames and a cornering body at the outer end positions of the frame rings located at both ends, and the fixing ring body, the cornering body and the frame frame are combined with detachable bolts. Put it in a state,
In this state, the concrete is poured into the frame of each frame ring while rotating the frame ring together with the rotating body to match the inner diameter of the concrete layer with the inner diameter of the fixing ring and the cornering body, and the frame frame adjacent after curing of the concrete layer. A method for producing a shielded composite segment, which can simultaneously form a composite segment having a plurality of frames by cutting the concrete layer in the axial direction at an internal position. The method of claim 1,
A circumferential joint groove for forming a circumferential direction protruding toward the inside of the frame ring is provided on both inner sides of the fixing ring, and the circumferential direction is formed in the concrete layer of the segment having a molded frame. A method for producing a shielded composite segment for forming a joint groove in the axial direction in the concrete layer of the segment provided with the frame by forming a joint groove of the frame, and cutting the concrete layer axially at an adjacent interframe frame position after molding. 3. The method according to claim 1 or 2,
The frame frame is provided with a cylindrical post-fill material injection hole protruding on the inner surface side of the back plate, and closes the inner end of the injection hole with a rubber cap, so that the end of the rubber cap coincides with the inner diameter finishing surface height of the concrete layer. Process for the preparation of synthetic segments 3. The method according to claim 1 or 2,
When the frame frame has a circumferential frame formed at four edges of the arcuate backboard, the frame ring, the fixed ring body, and the cornering body are assembled in the rotor for manufacturing a fume pipe. A method for producing a shielded composite segment for integrating with a rotating body by partially constructing an elastic mat at intervals occurring in an inner circumference. delete

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