JPH06272495A - Construction method of tunnel - Google Patents

Abstract

PURPOSE:To reduce a construction period, construction cost and labor in the construction of an open-cut tunnel. CONSTITUTION:Reinforcing steel 6 formed of shape steel is fitted to the outer peripheral surface of extremely thin PC lining form plates 1, 1, 1', along the circular direction thereof through connecting steel 7, and supporting material for supporting the PC lining form plates is installed expandably by a jack along the arch shape of a tunnel to be constructed, thus forming a temporary bearing assembled frame 14. This temporary bearing assembled frame 14 is installed in the movable and travelable state at the invert part 13 of channel cross section of a tunnel lower half part constructed at the bottom part of the open-cut ground. In this temporary bearing assembled frame, the PC lining form plates are assembled in arch shape and fixedly placed on both side parts of the invert part 13, and the adjacent end parts of the reinforcing steel fitted to the PC lining form plates adjacent in the ring direction are jointed in the integrated state. After arranging a series of reinforcements 26 on the outer peripheral part of the PC lining form plates, an outer form 29 is assembled in arch shape on the outside of the reinforcements 26. Cast-in-place concrete is filled in a gap between the outer form and the PC lining form plates, and a process of removing the outer form after the curing-hardening of the concrete is performed continuously in regular succession by moving the temporary bearing assembled frame 14 forward.

Description

Detailed Description of the Invention

[0001]

This invention relates to a tunnel construction method,
In particular, it relates to a construction method that uses a precast concrete plate and cast-in-place concrete in combination to construct by an open-cut construction method.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing a tunnel by an excavation method, a method of arranging an inner mold and an outer mold, placing reinforcement between them, and then pouring a cast-in-place concrete is generally carried out. .

[0003] In this form-casting method using cast-in-place, when using a balacentre as a form, a great deal of time and labor is required for assembling and disassembling the inner and outer forms, and a supporting material is required for holding the form. However, various work inside the tunnel cannot be performed until the concrete hardens and the formwork is dismantled, so there is a drawback that the construction period becomes long.

Further, even when a slide centle is used as a formwork, when the construction is carried out in each of the construction sections, there is a problem that a large amount of construction period and construction cost are required because the centle is disassembled, moved and assembled. At the same time, there is a disadvantage that the form cost is high in a tunnel with a short total length.

On the other hand, conventionally, a method of constructing a tunnel by assembling a plurality of arc-shaped precast concrete lining boards in a ring shape to shorten the construction period is also known, but it is resistant to the overburden pressure of backfill soil. The cost is high and the construction cost is enormous in order to manufacture a lining plate with a ridge.

[0006]

DISCLOSURE OF THE INVENTION The present invention is disadvantageous in that the above-mentioned in-situ formwork construction method requires a great deal of construction time and cost, and that the working efficiency is poor. It is to solve the problem that a large cost is required for manufacturing.

[0007]

According to the present invention, an inner peripheral portion of an upper half arch portion of a tunnel is divided into a plurality of parts in an arc direction, and the inner portion of the upper half arch portion itself is subjected to an external force such as a shearing force or bending due to a filling pressure of concrete. Although it has almost no proof strength, it maintains its shape when external force does not act and it is easy to break and it is along the arc direction on the outer peripheral surface of the extremely thin PC lining form plate 1, 1, 1 '. A reinforcing steel material 6 made of a vertical section steel is attached via a connecting steel material 7, the ground is excavated, and the invert portion 13 of the groove-shaped cross section of the lower half of the tunnel is constructed at the bottom of the ground.
And support members 15, 1 for supporting the PC lining formwork plates 1, 1, 1 ′ along the arch shape of the tunnel to be constructed.
A temporary receiving and assembling base 14 having a 5'extendable and retractable by a jack is installed so that it can move freely.
4, the PC lining form plates 1, 1, 1 ′ are assembled in an arch shape to be placed and fixed on both sides of the invert portion 13, and the PC lining form plates 1, which are adjacent to each other in the ring direction.
Adjacent ends of reinforcing steel materials attached to 1, 1'are joined and integrated, and after reinforcing bars 26 are arranged in series on the outer periphery of the PC lining form plate 1, 1, 1 ', an arch shape is formed on the outside. Outer formwork 29
Assemble the outer mold 29 and the PC lining mold plate 1, 1,
A tunnel construction method in which the step of pouring and filling in-situ concrete into the gap with 1'and removing the outer formwork 29 after curing and hardening it is continued while sequentially moving the temporary receiving assembly frame 14 forward It is a proposal.

[0008]

Since the PC lining form plate 1, 1, 1'is used as an inner formwork, it is integrated with the cast-in-place concrete filled between it and the outer formwork, and after curing and hardening, the inner formwork The time required for demolding is shortened and the construction cost and labor required for demolding can be reduced.

Further, since the PC-covered formwork plates 1, 1, 1'can stand on their own as a formwork after the reinforcing steel material 6 is attached, the assembled PC-covered formwork plates 1, 1, 1 ' It does not require a supporting material for holding, and it is possible to open the inside of the tunnel early and proceed with various internal works.

Since the PC lining form plates 1, 1, 1'are formed so thin that they do not maintain the proof stress against the filling pressure of concrete by themselves, the manufacturing cost and transportation cost are reduced and the tunnel is economically manufactured. In addition, the reinforcing steel material 6 attached to the outer periphery of the arc-shaped structure maintains sufficient proof stress to withstand the filling pressure of concrete, and the PC lining form plates 1, 1, 1 ' Since it is not necessary to rigidly connect each other, it is only necessary to connect them with a simple joint that does not easily separate, and even when a pin hinge has a statically indeterminate structure, it is stabilized with a rigidly connected reinforcing steel material, so PC lining It is possible to simplify the work of joining the formwork plates 1, 1, 1 '.

[0011]

[Example] In a factory, an extremely thin precast concrete lining form plate (hereinafter referred to as PC lining type) in which the inner circumferential portion of the upper half arch portion of the tunnel was divided into a plurality of parts in the arc direction in advance (3 divisions in the example) Produce 1, 1, 1'frame board) and bring these to the ground yard near the site.

The PC lining formwork plates 1, 1, 1'have almost no proof strength against external force such as shearing force and bending due to the filling pressure of concrete, but when the external force does not act, its form is changed. Molded to be thin enough to maintain and not break easily, PC lining form plate 1 on the side wall and P on the top end
As shown in FIGS. 4 to 6, comb-shaped concave and convex joints 2 and 3 are formed at the joint ends with the C lining form plate 1 ′ so as to face each other and engage with each other. Concavo-convex joint 2, 3
Through holes 4 and 5 are formed in the convex portions of the above so as to communicate with each other in series in the tunnel axis direction when meshing with each other.

As shown in FIGS. 1 and 2, in the ground yard, each PC lining form plate 1, 1 ′ has an H-shaped steel or the like on its outer peripheral surface (outer arch side) along the arc direction. The reinforcing steel material 6 having high rigidity is attached via the connecting steel material 7 continuously arranged in a wave shape in the longitudinal direction.

As shown in FIGS. 2 and 3, for example, the connecting steel member 7 is made of a strip steel plate having a substantially V-shaped shape when viewed from the front, and a bolt insertion hole 8 is formed at the end of the slope portion that spreads to the left and right. The opened fixing piece 9 is projected laterally, and a fixing plate 9 ′ having a bolt insertion hole 8 ′ is provided at the bottom end portion having a tapered shape.

In this connecting steel material 7, the fixing pieces 9 and 9 are attached to one side of the bottom surface of the flange or the like of the reinforcing steel material 6 by the bolts and nuts 1.
0, and the fixing piece 9'to the PC lining form plate 1,
1'is fastened with bolts 12 screwed into inserts 11 embedded in the outer peripheral surface of the 1'to integrate the reinforcing steel material 6 with the PC lining formwork plates 1, 1 ', and in the same manner, the connecting steel material 7 is sequentially reinforced steel material 6 Are mounted continuously along the longitudinal direction of the plate, and alternately as shown in FIG.

A PC with the reinforcing steel member 6 attached in this way
The lining form plates 1 and 1'are brought into the tunnel construction site in sequence.

The reinforcing steel material 6 and the connecting steel material 7 are not limited to those in this embodiment, and other shapes and structures can be used.

On the other hand, in the tunnel construction site where the PC lining formwork plates 1 and 1'are carried in, the ground is excavated and the invert portion 13 of the groove section in the lower half of the tunnel is constructed in advance by the site casting formwork method. Then, the temporary receiving and assembling base 14 is installed on the inversion portion 13 so as to be movable and movable as shown in FIGS. 9 and 10.

The temporary receiving and assembling base 14 is a support member 15, 1 for supporting a plurality of PC lining form plates 1 horizontally arranged on both sides of the upper part thereof along the arch shape of the tunnel to be constructed.
5'is installed by a jack so that it can expand and contract.

First, as shown in FIG. 11, a plurality of PC lining form plates 1 on the side wall of the arch are laterally arranged on both sides of the temporary receiving and assembling base 14 and supported on both side walls 13 'of the invert portion 13. Built-in, the lower end of which is a height adjustment bolt 16
Adjust the joint with the joint 13 on the top of the side wall 13 '.
7, and the reinforcing steel material 6 is mounted on the side wall 13 'by bolts 19 and 19' via the angle-type joint metal 18.
Secure to the top of.

As shown in FIG. 4, a plurality of PC lining form plates 1 and 1 arranged side by side are spliced with a plurality of inter-ring joint plates 20 across the boundary part on the outer peripheral side thereof, and both end parts are connected. Bolt 2
Connect by fastening with 1.

Next, as shown in FIG. 12, the PC lining plate 1 ′ at the top end is hung between the PC lining form plates 1 and 1 supported on both sides of the temporary receiving and assembling base 14, and FIG. As shown in Fig. 4, PC concave and convex joints 2 and 3 at both joint ends are connected through PC steel rods 22 to through holes 4 and 5 that communicate with each other in a state of being meshed with each other, and PC lining form frames adjacent to each other in the ring direction. Board 1,
A plurality of inter-panel joint plates 23 are spliced across the boundary portions on the outer peripheral side of each other 1 ', and both ends are fastened with bolts 24 to connect them.

Further, the reinforcing steel members 6 and 6 attached to the PC lining formwork plates 1 and 1'adjacent to each other in the ring direction are joined and integrated through a joint plate or the like with their ends abutted,
As a result, the thin-walled PC lining form plates 1, 1, 1'assembled in the shape of an arch are strongly supported by the reinforcing steel member 6 joined and integrated in the shape of an arch to withstand the external force such as shearing force and bending. It becomes a plate structure to hold.

In this state, the temporary receiving and assembling platform 14 is moved forward, and as shown in FIG. 13, a scaffold 25 is temporarily installed on the outer peripheral portion of the PC lining form plates 1, 1, 1 ', and this scaffold 25 is used. Reinforcing bars 26 are continuously arranged on the outer peripheral portion of the PC lining form plates 1, 1, 1 ′ above, and between the PC lining form plates 1, 1 ′ adjacent in the ring direction and the inter-ring direction. Waterproof the joints.

On both side walls 13 'of the invert portion 13, as shown in FIGS. 7 and 8, a reinforcing bar 27 to be wrapped around the lower end of the reinforcing bar 26 is provided in a projecting manner, and the reinforcing bar 27 of the PC lining form plate 1 is attached to this. By welding and connecting the reinforcing bars 28 projecting from the outer peripheral surface of the lower end portion, the PC-covered formwork plate 1 and the side wall 13 'can be firmly fixed to the concrete placed in the upper portion of the side wall 13'. It becomes possible to integrate them.

After the reinforcing bars 26 have been laid out, as shown in FIG. 14, an outer form frame 29 is assembled on the outside between the side walls 13 ', 13' in an arch shape, and the outer form frame 29, the tunnel inner wall and The cast-in-place concrete 30 is poured and filled into the gap between the PC lining form plate 1, 1, 1'which also serves as the inner form, and after the curing and curing, the outer form 29 is demolded.

After constructing a tunnel in which the PC lining form plates 1, 1, 1'and the cast-in-place concrete 30 are integrated as shown in FIG. Backfill to complete the construction.

[0028]

As described above, according to the present invention, since the PC lining form plate is used as the inner formwork, the cast-in-place concrete filled between this and the outer formwork is integrally cured and hardened. The work of demolding the mold becomes unnecessary, and the construction period can be shortened accordingly, and the construction cost and labor required for demolding can be reduced.

Further, since the PC-covered formwork plate can stand as a formwork after mounting the reinforcing steel material, no supporting material is required to hold the assembled PC-covered formwork plate, and the space inside the tunnel can be maintained. It becomes possible to open it early and perform various internal work.

Since the PC lining form plate itself is formed so thin that it does not maintain the proof stress against the filling pressure of concrete, it is possible to economically construct a tunnel by reducing manufacturing costs and transportation costs. Also, when assembling into an arch shape, the reinforcing steel material attached to the outer periphery can maintain the proof strength to withstand the filling pressure of concrete sufficiently, and it is not necessary to rigidly connect the PC lining form plate members together, so it is not easily separated. It is only necessary to connect with a simple joint, and especially in the case where the pin hinge has a statically indeterminate structure, the reinforcing steel material that is rigidly connected stabilizes, so that the work of joining the PC lining form plate can be simplified.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a construction state of the present invention in left and right different modes.

FIG. 2 is a partial vertical cross-sectional side view of a PC lining form plate showing a reinforcing steel material mounting state according to the present invention.

FIG. 3 is a plan view showing a mounting arrangement state of a connecting steel material with respect to a reinforcing steel material according to the present invention.

FIG. 4 is a plan view showing an assembled state of the PC lining form plate according to the present invention.

FIG. 5 is a partial front view showing a connected state of the PC lining form plate according to the present invention.

FIG. 6 is a partial plan view showing a connected state of the PC lining form plate according to the present invention.

FIG. 7 is a partial vertical cross-sectional front view showing the installation state of the PC lining form plate in the invert section in the present invention.

FIG. 8 is a partial cross-sectional plan view showing the installation state of the PC lining form plate in the invert section in the present invention.

FIG. 9 is a vertical sectional front view showing a construction state of the present invention.

FIG. 10 is a vertical sectional side view showing a construction state of the present invention.

FIG. 11 is a vertical sectional front view showing a construction state of the present invention.

FIG. 12 is a vertical sectional front view showing a construction state of the present invention.

FIG. 13 is a vertical sectional front view showing a construction state of the present invention.

FIG. 14 is a vertical sectional front view showing a construction state of the present invention.

FIG. 15 is a vertical sectional front view showing a construction state of the present invention.

[Explanation of symbols]

 1 PC lining form plate 1'PC lining form plate 2 Concavo-convex joint 3 Concavo-convex joint 4 Through hole 5 Through hole 6 Reinforcing steel material 7 Connecting steel material 8 Bolt insertion hole 8 'Bolt insertion hole 9 Fixing piece 9' Fixing piece 10 Bolts and nuts 11 Inserts 12 Bolts 13 Inverts 13 'Side walls 14 Temporary receiving assembly frames 15 Supporting materials 16 Height adjusting bolts 17 Joint caulking materials 18 Joining hardware 19 Bolts 20 Ring joint plates 21 Bolts 22 PC steel bars 23 Panels Inter-joint plate 24 Bolt 25 Scaffold 26 Reinforcing bar 27 Reinforcing bar 28 Reinforcing bar 29 Outer formwork

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fukuoka Keinai, Osaka City, Osaka City, Konohana Ward, 4-chome, No. 3 55 Konoikegumi Co., Ltd. (72) Inventor, Takeshi Sakaguchi, Osaka City, Osaka City, Konohana, Ward No. 55 Konoike Gumi Co., Ltd. (72) Inventor Satoshi Kadoya 4 2-3 Shiba, Minato-ku, Tokyo Japan Press Concrete Co., Ltd. (72) Inventor Hiro Osawa 1-8-23 Bentenbashi Dori, Niigata City, Niigata Prefecture Nihon Samicon Co., Ltd. (72) Inventor Masahiro Shiraiwa 1-8-3 Shimbashi, Minato-ku, Tokyo Inside Japan Concrete Industries Co., Ltd. (72) Inventor Masaru Okayama 1-3-8 Shimbashi, Minato-ku, Tokyo Within Japan Concrete Industry Co., Ltd.

Claims (1)

[Claims] 1. An inner peripheral portion of an upper half arch portion of a tunnel is divided into a plurality of portions in an arc direction, and has almost no proof strength against an external force such as a shearing force or a bending due to a filling pressure of concrete, When the external force does not act, the reinforcing steel material made of the shape steel is attached along the arc direction to the outer peripheral surface of the PC lining form plate of ultra-thin wall so as not to break easily while maintaining its shape, through the connecting steel material, A jack for supporting the PC lining form plate along the arch shape of the tunnel to be constructed at the invert part of the groove type cross section of the lower half of the tunnel constructed by excavating the ground on the bottom of the jack. The tentative receiving assembly cradle is installed so as to be extendable and retractable, and the PC lining form plate is assembled in an arch shape on the temporary receiving assembler to be mounted and fixed on both sides of the invert section. , The adjacent ends of the reinforcing steel materials attached to the PC lining form plates adjacent to each other in the ring direction are joined and integrated, and the reinforcing bars are arranged in series on the outer peripheral part of the PC lining form plate, and then the outside thereof. The process of assembling the outer mold into an arch shape, pouring and filling in-situ concrete into the gap between the outer mold and the PC lining form plate, and demolding the outer mold after curing and hardening it in sequence A tunnel construction method characterized by continuing the assembly frame while moving forward.