JP3347866B2 - How to lay the tunnel footstep - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a step floor having a substantially horizontal upper surface and extending in the longitudinal direction of a tunnel at the bottom of a tunnel lining body having a ring-shaped cross section.

[0002]

2. Description of the Related Art For example, tunnels such as common trenches in which various public utilities such as telephone cables, gas pipes, and water and sewage systems are disposed have many vertically long rectangular or ring-shaped cross sections. In either case, the tubular lining that constitutes the outer wall of the tunnel is
It is constructed by installing a number of arc-shaped precast concrete slabs (so-called segments). In this kind of communal trench, the center of the bottom is used as a walkway for workers and a passage for carrying in materials in order to inspect, repair, or expand various public facilities. Here, in the case of a tunnel having a rectangular cross section, a flat and horizontal bottom can be used as a passage as it is. However, in the case of a tunnel having a ring shape, a passage having a horizontal top surface is used because the bottom is concave. That is, it is necessary to lay a walking floor.

FIG. 4 shows a tunnel which is a common groove having a ring-shaped cross section. In this case, a ring 2 formed by mounting a plurality of segments 1 is joined in an axial direction to form a lining 3. It is constructed, and various public facilities 4 are arranged via hangers 5 therein, and a floor 7 having a horizontal upper surface and a water guide groove 6 extending on both sides is laid at the bottom. Conventionally, the above-mentioned walking floor 7 is laid by casting concrete on site.

[0004]

In the method of laying a floor by casting concrete on site, when the construction of the lining is completed over the entire length or after the construction of a certain distance is completed, the bottom of the lining is formed. The procedure for setting and curing concrete with the formwork installed in the tunnel is long, so the construction period until the completion of the final construction of the tunnel is prolonged, and cost is required because a large amount (many) of formwork is required. I was dissatisfied. In addition, when casting concrete, it is necessary to clean the inner peripheral surface of the bottom of the lining body of the casting portion and to provide a water guiding groove, which is troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tunnel pedestrian laying method capable of facilitating construction, shortening a construction period, and reducing costs.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and has an upper surface which is substantially horizontal and extends in the longitudinal direction of the tunnel at the bottom of a tunnel lining body having a ring-shaped cross section. A method of laying a step floor, comprising: an arc surface along an inner peripheral surface of the lining body; and an upper surface and a bottom portion which are substantially horizontal with the arc surface aligned with a bottom inner peripheral surface of the lining body. A plurality of precast blocks having a side surface forming a step with the inner peripheral surface, the arc surface is adjusted to the bottom inner peripheral surface of the lining body in a state where the upper surface is substantially horizontal, and they are brought close to or joined to each other. Side by side in the longitudinal direction of the tunnel
From the top surface of the precast block to the arc surface
The through-hole formed as a screw hole, a hollow cylindrical
The bottom edge of the jack jig hits the inner peripheral surface of the bottom of the lining.
Pre-cast by further screwing
Raise the lock and pull the pre-cap from the hollow part of the jack jig.
Arc surface of strike block and bottom of lining body facing the arc surface
It is characterized in that an adhesive is filled between the inner peripheral surface and the inner peripheral surface .

[0007] The jack jig, and the jig main body screw portion to be screwed into the screw hole on the outer peripheral surface is formed, loaded into the threaded hole is disposed below the jig body, the And a pressure receiving cylinder having a lower end formed with a hole for passing the adhesive.

[0008]

According to the present invention, a plurality of precast blocks are arranged on the inner peripheral surface of the bottom of the lining body, so that a step floor is laid at the bottom of the tunnel. Pre-manufactured precast blocks are arranged side by side, which eliminates the need for work such as installing a formwork, placing concrete, and curing compared to the conventional method of placing concrete on site, shortening the construction period and reducing costs. Reduction is achieved.

Further, since the adhesive is filled between the precast block and the lining body through the through hole formed from the upper surface of the precast block to the arc surface , the precast block can be joined to the lining body. By making the through-hole a screw hole and screwing a hollow cylindrical jack jig into the screw hole to float the precast block, it becomes easy to fill the adhesive from the hollow portion of the jack jig.
Further, the jack jig is provided with a jig main body having an outer peripheral surface formed with a screw portion to be screwed into the screw hole, and disposed below the jig main body and loaded into the screw hole, and has a lower end portion. If the pressure receiving cylinder is formed with a hole for passing the adhesive, the adhesive is filled between the precast block and the lining body from the passing hole of the pressure receiving cylinder, and the pressure receiving cylinder is buried. The tool body can be used repeatedly.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a tunnel which is a common groove having a function similar to that shown in FIG. That is, in this tunnel, a ring 2 and a lining 3 are constructed by a large number of segments 1, and various public utilities 4 such as telephone cables, gas pipes, water and sewage are arranged via hangers 5 inside the ring 2. Numeral 11 denotes a step laid by the method of the present embodiment.

The walking floor 11 is composed of a number of concrete precast blocks (hereinafter simply referred to as blocks) 12. This block 12 has a rectangular shape in plan view,
As shown in FIG. 2, an arc surface 13 along the inner peripheral surface of (the segment 1 of) the lining body 3 and a substantially horizontal surface with the arc surface 12 aligned with the bottom inner peripheral surface of the lining body 3 And a notch 17 extending in the longitudinal direction of the tunnel (the width direction of the segment 1) at both ends of the arc surface 13 in the circumferential direction. Is formed. In the center of this block 12, the upper surface 1
A through hole 18 is formed from 4 to the arcuate surface 13, and an insert fitting 20, which is a screw cylinder having a trapezoidal thread 19 formed on the inner peripheral surface, is integrally embedded in the through hole 18. The insert fitting 20 is buried in a range of about ／ above the through-hole 18, and a portion below the insert fitting 20 has a tapered diameter.

In this case, a pair of ridges 21 are formed on the inner peripheral surface of the segment 1 at intervals in the circumferential direction.
The interval between the ridges 21 is set to be slightly longer than the length of the arc surface 13 between the notches 17 of the block 12. These ridges 21 extend over the entire length of the segment 1 in the width direction. The center between the two ridges 21 is the segment 1
Is formed at a position corresponding to the center of the circumferential length of.
The segment 1 installed on the bottom of the lining body 3 is set so that the center of its circumferential length is located at the lowest part. However, even if the segment 1 is slightly displaced in the circumferential direction due to an installation error, the arc 1 is not circular. If the surface 13 is aligned with the inner peripheral surface between the ridges 21, the lower surface of both ends (the portion thinned by the notch 17) 22 of the block 12 is dimensioned so as to cover the entire upper surface or a part of the two ridges 21. Has been made. Therefore, the height of the ridge 21 is set such that a slight gap is formed between the block 12 and both ends 22 in a state where the arc surface 13 is aligned with the inner peripheral surface between the ridges 21.

In order to lay the walking floor 11 by the block 12, the upper surface 14 becomes horizontal every time one ring 2 of the lining body 3 by the segment 1 is formed or when a plurality of rings 2 are joined. In the state, the arc surface 13 is covered with the lining 3
Are arranged side by side in the longitudinal direction of the tunnel by contacting the end faces of adjacent ones with the inner peripheral surface of the bottom of the tunnel. At this time, a pressure-receiving sleeve (pressure-receiving cylinder) 24 that constitutes a jack jig 23 described later is arranged at the center of the bottom of the lining 3 corresponding to the through-hole 18.
4 is inserted into the through hole 18, and a leak-proof material 2 such as a sponge is
5 is arranged. At least one axial end of the pressure receiving sleeve 24 has a plurality of grooves (passing holes) 2 as shown in FIG.
4a are formed radially, and are arranged with the end on the side where the groove 24a is formed downward.

To transport and install the block 12 in the tunnel, it is desirable to use a generally known erector,
The arm of the erector may be screwed into the insert fitting 20. In order to make the upper surface of the block 12 horizontal, the arc surface 13 is slid in the circumferential direction between the ridges 21, and the leakage preventing material 25 is sandwiched between both ends 22 and each ridge 21. I do.

Next, a jig main body 26 constituting the jack jig 23 is screwed into the insert fitting 20. The jig body 26 has a hollow cylindrical shape as a whole and has an insert fitting 2 on the outer peripheral surface.
A screw part 27 screwed into the trapezoidal screw part 19 of 0, a screw part 28 is also formed on the inner peripheral surface of the hollow part, and a hexagonal bolt head 30 is formed at the upper end with a washer part 29 interposed therebetween. Thus, the jack jig 23 is constituted by the jig main body 26 and the pressure receiving sleeve 24. Screw part 2 of jig body 26
The screw 7 is screwed into the trapezoidal thread 19 of the insert fitting 20 until the lower end contacts the pressure receiving sleeve 24, and the jig body 26 is further screwed from this state. Then, although the jig main body 26 is screwed into the insert fitting 20, further progress is prevented by the pressure receiving sleeve 24, and the block 12 floats by the screwing action instead.

When the block 12 is slightly lifted in this way, a grout material injection pipe (not shown) is screwed into the screw portion 28 on the inner peripheral surface of the jig main body 26, and a grout material (adhesive material) such as mortar is formed therefrom. G is injected into the space between the arc surface 13 of the block 12 and the inner peripheral surface at the bottom of the lining 3 facing the arc surface 13, and the block 12 is joined to the segment 1. At this time, the groove 24 of the pressure receiving sleeve 24
The grout material G flows out from a. The filled grout material G is blocked by the leak stopper 25 and does not leak out from both ends 22. When the filling of the grout material G is almost completed, the jig main body 26 is removed, the grout material G is filled in the through hole 18 until the grout material G is flush with the upper surface 14, and the pressure receiving sleeve 24 is filled and killed. The tool body 26 is used repeatedly. Further, the step 15 formed between the both side surfaces 16 of the block 12 and the inner peripheral surface of the bottom portion is
Is configured as

The step floor 11 is laid at the bottom of the tunnel by arranging a number of blocks 12 on the inner peripheral surface of the bottom of the lining 3 in the above manner. According to the method of laying the walking floor 11, the blocks 12 are laid by arranging the blocks 12 that have been manufactured in advance. Since such work is not required, the construction period is shortened and the cost is reduced. In particular,
Without waiting for the entire length of the tunnel to be completed, as described above, the block 12 can be installed every time one ring 2 of the lining body 3 by the segment 1 is formed or when a plurality of rings 2 are joined. In this way, if the blocks 12 are sequentially installed following the completion of the ring 2, the construction period can be significantly reduced.

Further, it is not necessary to install a mold as described above, and the installation of the block 12 automatically causes the water guide groove 31 to be installed.
Is formed, and since it is not necessary to clean the inner peripheral surface of the bottom of the lining body 3 for concrete casting, simplification of construction is promoted.

The grout material G can be easily filled by mounting the jack jig 23 including the pressure receiving sleeve 24 and the jig main body 26 on the insert metal fitting 20 and floating the block 12. In addition, jack jig 2
3 is composed of two members, a jig main body 26 and a pressure receiving sleeve 24, and the jig main body 26 can be used repeatedly, so that the cost can be reduced in this respect as well.

[0020]

As described above, according to the method for laying a footstep of a tunnel according to the present invention, an arc surface along the inner peripheral surface of the lining body of the tunnel and the arc surface are formed in the bottom of the lining body. A plurality of precast blocks each having an upper surface that is substantially horizontal and a side surface that forms a step between the inner peripheral surface of the bottom and a plurality of precast blocks that are aligned with the peripheral surface, and covering the arc surface so that the upper surface is approximately horizontal It is characterized by being aligned with the bottom inner peripheral surface and being arranged side by side in the longitudinal direction of the tunnel so as to be close to or joined to each other. Since there is no need to perform operations such as casting and curing, there is an effect that simplification of construction, shortening of construction period and reduction of cost are achieved.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a common groove having a walking floor laid according to a method of one embodiment of the present invention.

FIG. 2 is an enlarged front sectional view showing a structure of a walking floor.

FIG. 3 is a bottom view of a pressure receiving sleeve constituting the jack jig.

FIG. 4 is a front sectional view of a common groove having a walking floor laid by a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Segment, 2 ... Ring, 3 ... Lining body, 11 ... Footbed, 12 ... Concrete precast block, 13
... Arc surface, 14 ... Top surface, 15 ... Step, 16 ... Side, 18
... Through hole, 20 ... Insert fitting (screw hole), 21 ... Protrusion, 23 ... Jack jig, 24 ... Pressure receiving sleeve (Pressure receiving cylinder), 24a ... Groove (passing hole), 25 ... Leak prevention material, 2
6: jig body, 27: screw portion, 31: water guide groove, G: grout material.

Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 11/00 E21D 11/04 E21D 11/08

Claims (2)

(57) [Claims] 1. A method of laying a step floor having a substantially horizontal upper surface and extending in a longitudinal direction of a tunnel, at a bottom portion of the tunnel lining body having a ring-shaped cross section, wherein the walking floor extends along an inner peripheral surface of the lining body. A plurality of precast blocks each having an arc surface and a side surface forming a step between the substantially horizontal upper surface and the bottom inner peripheral surface in a state where the arc surface is aligned with the bottom inner peripheral surface of the lining body, top with the matched arc surface in a state where a substantially horizontal in the bottom peripheral surface of the lining body, distribution and set side by side in the tunnel longitudinal direction in close proximity or bonded to each other, form toward arcuate surface from an upper surface of the precast block
The formed through hole is used as a screw hole, and a hollow cylindrical die is inserted into the screw hole.
The lower end of the jack jig hit the inner peripheral surface of the bottom of the lining
By further screwing in from the state, the precast block
Surface, and precast from the hollow part of the jack jig
Inside the arc surface of the block and the bottom of the lining body facing the arc surface
A method for laying a footstep in a tunnel, characterized in that an adhesive is filled between the tunnel and a peripheral surface . 2. The jack jig having a screw portion formed on an outer peripheral surface thereof and screwed into the screw hole, and disposed below the jig body and loaded into the screw hole. the adhesive tunnel walking floor laying method according to claim 1, wherein the passage hole is characterized in that it consists of a pressure receiving barrel formed of the lower end.