JPH09150414A - Method for manufacturing and demolding segment for tunnel lining - Google Patents

Abstract

(57) [Abstract] (Correction) [Problem] Even with a tunnel lining segment that does not have a joint plate like a tenon segment, it is possible to remove the mold without burying a mold insert such as an implant nut. To do so. SOLUTION: A male screw 39 is engraved on the outer peripheral surface of a demolding jig 38, and a female screw 40 is engraved on the inner peripheral surface thereof. Square grooves 41 are formed in the lower surface of the demolding jig in the radial direction. A minus screwdriver is engaged with this square groove, and the demolding jig is screwed into the female screw 8 on the lower inner peripheral surface of the grout hole frame 7. The frame 7 is installed on a form base, concrete is poured, and segments 9 are formed by dividing the tunnel lining in the circumferential direction and the axial direction. When the segment 9 is removed from the mold, the wheel bolt 43 is inserted from the opening of the upper surface of the frame 7 and fitted into the female screw of the tool for removing the mold, and the hook 45 of the crane is hooked on the wheel 45 of the wheel bolt. Wear and hang.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a segment obtained by dividing a tunnel lining in a circumferential direction and an axial direction with precast concrete and removing it from the mold. The present invention relates to a method suitable for demolding a segment having no joint plate.

[0002]

2. Description of the Related Art In the case of forming a segment obtained by dividing a tunnel lining in a circumferential direction and an axial direction by using precast concrete, conventionally, as shown in FIG.
Are provided at the end sides of the inner peripheral surface 2 of the segment 1 to penetrate the joint surfaces 3, 3, 3, 3 of the segment 1, and the notches 4, 4 ... Metal joint plates 5, 5 ... Are embedded in the cutouts 4a, 4a ... Formed on 3, 3, 3, 3. Bolt holes 6, 6 ... Are bored in the joint plates 5, 5. Further, a cylindrical metal grout hole frame 7 is embedded in the center of the segment 1.

When the segment 1 is released from the mold, a ring bolt or a hook bolt is externally screwed into the bolt holes 6, 6 ... Hang the crane hooks and lift. Then, a plurality of the segments 1 are connected in the circumferential direction and the axial direction to construct a tunnel lining. At this time, the joint plates 5 of the segments 1 adjacent to each other in the front, rear, left, and right are positioned so as to face each other, and the bolts are screwed into the bolt holes 6 from the notches 4 to thereby adjoin the adjacent segments 1. To join.

After forming the tunnel lining in this way, backfill injection is performed by screwing a grout device into the female screw portion 8 engraved in the lower portion of the inner peripheral surface of the grout hole frame 7. Then, a cap made of ABS resin or the like is fitted into the female screw portion 8 of the grout hole frame 7,
The lower surface opening of the grout hole frame 7 is closed.

On the other hand, in recent years, as shown in FIG. 6, a so-called tenon segment 9 having no joint plate has been known. Out of the joint surfaces of the tenon segment 9, front and rear axial joint surfaces 10, 10 are provided with a tenon 11 extending in the circumferential direction on one side and a tenon groove 12 extending along the circumferential direction on the other side. Has been done. Further, stud nuts 13, 13 ... Are embedded in the front and rear axial joint surfaces 10, 10.

When the mortise segment 9 is released from the mold, a wheel bolt or a hook bolt is screwed onto the stud nuts 13, 13 ..., and the wheel bolt or hook bolt is used for a crane. Hang it on and hook it up.

During construction of the tunnel lining, the tenon segments of one of the tenon segments 9 are fitted to the tenon segments 12 of the other tenon segment 9 adjacent to each other in the axial direction. Are sequentially connected.

A grout hole frame 7 is also embedded in the center of the tenon segment 9 like the segment 1. The function of the grouthole frame 7 is the same as that of the segment 1. Also,
The stud nut 13 is the outer peripheral surface 1 of the mortise segment 9.
It may be buried in 4. Further, reference numeral 15 is an inner peripheral surface of the tenon segment 9, and reference numeral 16 is a circumferential seam surface of the tenon segment 9. And the circumferential seam surface 16
A rectangular groove 17 for sealing is provided in the groove.

[0009]

[Problems to be Solved by the Invention]
Since the tenon and the tenon groove are fitted to each other to assemble the lining, the lining can be applied more easily than a normal joint plate type segment connected by bolts. Also, the lining with the tenon segment is superior in resistance to shear stress.

However, even though the stud nut embedded in the mortise segment is used only in the demolding process, it will remain permanently in the product, resulting in application and cost. Is not efficient. Further, in the manufacturing process, it is complicated since it requires a work such as setting the stud nut in the mold in advance.

Therefore, like the tenon segment,
Even segments that do not have joint plates,
The present invention has a technical problem to be solved in order to enable mold release without embedding a mold release insert such as an implant nut, and an object of the present invention is to solve the problem.

[0012]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, in which a male screw is engraved on the outer peripheral surface and a female screw is engraved on the inner peripheral surface, and A cylindrical demolding jig provided with a detachable tool engaging portion on the lower surface was fitted to a female screw carved in the lower part of the inner peripheral surface of the grouthole frame, and the grouthole frame was attached to the mold. By installing it on the base and pouring concrete, a segment that divides the tunnel lining in the circumferential direction and the axial direction is formed, and at the time of demolding the segment, a male screw was engraved at the tip. Provided is a method for manufacturing a tunnel lining segment and a method for removing a mold, which comprises fitting a mold releasing tool into the mold releasing jig and lifting the tool.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to FIGS. The same components as those of the conventional example are designated by the same reference numerals, and the description thereof will be appropriately omitted.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a precast concrete pouring formwork, and an upper surface 23 of a base 22 of the precast concrete pouring formwork 21 has a centrally bulged central arcuate shape. The upper surface 23 forms the inner peripheral surface 15 of the arc-shaped tenon segment 9. Here, the central angle of the arc drawn by the base upper surface 23 is 72 degrees. Therefore, an annular ring is formed by combining five tenon segments 9 in the circumferential direction, and these are connected in the axial direction to form a tunnel lining. The center angle (72 degrees) of the arc is an example, and the present invention is not limited to this.

On the left and right sides of the base 22, end frames 24, 24 for forming the circumferential joint surfaces 16, 16 of the tenon segment 9 are respectively provided on the bracket 25 and the horizontal shaft 2.
It is rotatably pivoted in the left-right direction via 6. Further, a crank portion 27 and a compression spring portion 28 are provided below the end frames 24, 24, respectively, and when the end frame 24 is rotated outward in the left and right directions, the crank portion 27 and the compression spring portion are provided. By the action of 28, the end frame 24 is formed to be in a clamped state at a predetermined opening angle. Further, the compression spring portion 28 also functions as a safety device for preventing the end frame 24 from being lowered by its own weight by constantly biasing the end frame 24 inward and leftward.

When the end frame 24 is set, the inner wall 29 of the end frame 24 is formed so as to be oriented just in the normal direction to the arc shape of the base upper surface 23. The convex portion 30 of the inner wall 29 is for forming the sealing square groove 17 on the circumferential joint surface 16 of the tenon segment 9.

Further, in the set state, the gable frame 24 is provided.
So that the weight of concrete does not drop below the gable frame 24
Are fastened to the side frames 31, 31 arranged in front of and behind the base 22 with bolts (not shown). Here, the side frames 31, 3
1 is an axial joint surface 10, 1 in front of and behind the mortise segment 9
0 is formed, and its upper edge coincides with the outer peripheral surface 14 of the arc-shaped tenon segment shown by the chain double-dashed line in FIG. Further, two left and right forks 32, 32 are vertically provided on the lower end edge of the side frame 31. The forks 32, 32 can be engaged with the side frame guide portions 33, 33 opened in the base 22, respectively, and can be slid, whereby the side frame 31 can move in the front-back direction with respect to the base 22. It is formed so that it can be opened and closed.

The side frame 31 provided on the front surface of the base 22 is provided with a recess 34 having a trapezoidal cross section along the circumferential direction, while the side frame 31 provided on the rear surface of the base 22 is provided. A convex portion 35 having a trapezoidal cross section is provided along the circumferential direction. The concave portion 34 is for forming the tenon 11 of the tenon segment 9, and the convex portion 35 is the tenon segment 9.
This is for forming the tenon groove 12. In the set state, the front and rear side frames 31, 31 are tightened to the base 22 with bolts (not shown).

After the grout hole frame 7 is installed and fixed at the center of the base upper surface 23, the canopy 36 is further attached.
Forming a precast concrete pouring form 2
1 is assembled, and concrete is poured from the opening 37 provided in the front-back direction of the top of the canopy 36.

The female screw 8 engraved on the lower portion of the inner peripheral surface of the grout hole frame 7 is preliminarily provided with the demolding jig 3
Fit and place 8. As shown in FIG. 3, the demolding jig 38 is formed in a cylindrical shape, and a male screw 39 that fits with the female screw 8 of the grout hole frame 7 is formed on the outer peripheral surface thereof.
Is engraved, and a female screw 40 is engraved on its inner peripheral surface.

Further, on the lower surface of the demolding jig 38, grooves 41,
41 and circular holes 42, 42 are recessed. These grooves 41, 41 and circular holes 42, 42 are provided for attaching / detaching the demolding jig 38 to / from the grout hole frame 7. That is, when a minus screwdriver is used as the attachment / detachment tool, the minus screwdriver is engaged with the grooves 41, 41 while the attachment / detachment tool is
When a pen plus in which two cylinders are projected on one side of the flange is used, the cylinder of the pen plus is used as the circular holes 42, 4
2 and engage the demolding jig 38 with the grout hole frame 7. As described above, the attaching / detaching tool engaging portion provided on the lower surface of the releasing jig 38 is determined by the correlation with the attaching / detaching tool to be used. The grooves 41, 41 and the circular holes 42, 42 are not limited as long as they can rotate.

Then, after the concrete cast on the precast concrete casting form 21 is hardened, the canopy 3
6, the side frames 31, 31 and the end frames 24, 24 are opened. Then, as shown in FIG. 4, the bolt 43 with a ring is inserted from the opening on the upper surface of the grout hole frame 7, and the male screw 44 engraved at the tip of the bolt 43 with a ring is attached to the inner periphery of the demolding jig 38. The female screw 40 on the surface is fitted. Further, the hook 45 of the crane is attached to the wheel 45 provided at the base end of the wheel bolt 43.
By hanging and lifting 6 on, the tenon segment 9 can be removed from the precast concrete pouring formwork 21.

After demolding, the demolding jig 38 is removed using the above-mentioned minus screwdriver or pen plus. Then, this demolding jig 38 is attached to the grout hole frame 7 of the tenon segment 9 to be subsequently placed, and is used for demolding the tenon segment 9.

If a female screw is engraved over the entire length of the inner peripheral surface of the grout hole frame 7, the ring bolt 43 is fitted directly onto the grout hole frame 7 from above the grout hole frame 7. Although the demolding jig 38 is unnecessary in such a case, the winding thickness of the tunnel lining is usually several tens of centimeters, and therefore the grout hole frame 7 has Since the length is required for the winding thickness, engraving the female screw on the entire length of the inner peripheral surface of the grout hole frame 7 made of metal of such a length is a very complicated work and the cost is doubled. Therefore, it can be said that it is irrational to adopt such means only for the demolding step.

Although the tenon-bearing segment has been described in the embodiment of the present invention, embedding the grout hole frame in the center of the segment is the same in a normal joint plate type segment, etc. The present invention is not limited to the method of manufacturing and demolding, but can be applied to the method of manufacturing and demolding all tunnel lining segments that embed a grout hole frame including a normal joint plate type segment. The invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the invention extends to these.

[0026]

As described above, according to the present invention, a cylindrical demolding tool having an outer peripheral surface engraved with a male screw and an inner peripheral surface engraved with a female screw is fitted in advance to the grout hole frame. do it,
It is configured to cast concrete. After the concrete is hardened, the demolding tool having the male screw engraved at the tip is fitted into the demolding jig and lifted, whereby the tunnel lining segment can be demolded.

A detachable tool engaging portion is provided on the lower surface of the demolding jig so that it can be detachably attached to the grout hole. Therefore, this demolding jig is not permanently installed in the product, even though it is used only in the demolding process like the conventional mortared segment stud nuts, and is removed from the segment after demolding. Therefore, it can be diverted to the demolding of the next segment, which is extremely efficient.

For this reason, even a segment having no joint plate such as a tenon segment does not need an insert for demolding such as a stud nut anymore, and the labor for burying it can be omitted. Not only is the process simplified, but all components in the product can be configured to direct their final function as a tunnel lining.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of a precast concrete pouring formwork.

FIG. 2 is a sectional view taken along line AA of FIG. The side frame and the canopy shown by the two-dot chain line in FIG. 1 are shown by the solid line in this figure.

FIG. 3 is a perspective view of a demolding jig.

FIG. 4 is a cross-sectional view of a main part of a segment during demolding work.

FIG. 5 (a) is a side view of the joint plate type segment. (B) The bottom view of (a).

FIG. 6 (a) is a side view of the tenon segment. (B)
The end view on the BB line of (a).

[Explanation of symbols]

 7 Grout hole frame 8 Female screw on the lower inner peripheral surface of grout hole frame 9 Mortise segment 21 Formwork for precast concrete placement 22 Base 38 Demolding jig 39 Male screw for demolding jig 40 Female screw for demolding jig 41 Groove 42 Circular Hole 43 Wheel Bolt 46 Crane Hook

Claims (1)

[Claims] 1. A grout for a cylindrical demolding jig, wherein a male screw is engraved on the outer peripheral surface, a female screw is engraved on the inner peripheral surface, and a detachable tool engaging portion is provided on the lower surface. The tunnel lining is installed in the circumferential direction by fitting it into a female screw carved in the lower part of the inner peripheral surface of the hole frame, and installing the grout hole frame on the base of the formwork and placing concrete. While forming a segment divided in the axial direction,
When demolding the segment, a demolding tool having a male screw engraved on the tip is fitted to the demolding jig and hoisted, and manufacturing and demolding of the segment for tunnel lining Method.