JPH0988480A - Combined box culvert body for open shield tunnelling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently execute an open shield tunnelling work even under such an obstacle as the bridge, etc. SOLUTION: A combined box culvert body is composed at least of a pair of box culverts 10 which are used for the open shield tunnelling method and vertical projecting strip sections are provided on both side sections of the end face of either one culvert 13-1 or 13-2. Then vertical recessed groove sections 27 which accept the projecting strip sections are provided on both side sections of the end face of the other box culvert 13-2 or 13-1. The culverts 13-1 and 13-2 can be joined together by sliding culverts on each other so that the projecting strip sections can get in the recessed groove sections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box culvert assembly for an open shield construction method, and more particularly, to a box culvert for suspending a box culvert from above an excavation groove and placing it in the excavation groove. The present invention relates to a box culvert combination used in an open shield method carried out in various places.

[0002]

2. Description of the Related Art The open shield construction method is applied to construct a structure such as a water channel or a tunnel in a relatively shallow underground from the surface of the earth. In this open shield method, an open shield machine including a blade that penetrates the face of an open cut groove and a propulsion device such as a propulsion jack is used.

With the blades penetrating to stabilize the face and prevent the surrounding ground from collapsing, an excavator such as a backhoe on the ground defines the wall of an underground structure such as a waterway or tunnel. The digging groove for burying the reinforced concrete box culvert is gradually extended.

When the digging groove extends by a predetermined length, the open shield machine operates the propulsion jack accordingly. By the operation of the propulsion jack, the open shield machine is propelled by the continuous box culverts installed in the cut groove behind the open shield machine as a reaction force.

When a space is formed between the state-of-the-art box culvert that bears a reaction force and the open shield machine by the promotion of this open shield machine, the new box culvert becomes like a ground crane device. It is suspended from above by the suspension device in the excavation groove and installed at the top of the box culvert group.

[0006] The blade of the open shield machine penetrates the face in a state in which the reaction force is directly applied to the newly installed box culvert, and the continuous wall of the box culvert is hereafter repeated by repeating the above-mentioned steps. The body grows.

By the way, in the above-mentioned open shield construction method, the box culvert is inserted immediately after the open shield machine, and the insertion position of the box culvert is advanced as the open shield is propelled. When building an object, the bridge covering the open cut groove hinders the suspension work of the box culvert in the groove by the suspension device.

In such a case, an intermediate pushing device is provided between the state-of-the-art box culvert and the open shield machine before the excavation groove reaches the bridge. A new box culvert is inserted between the middle pushing device and the open shield machine, and the box culvert is pushed forward by the middle pushing device.

The steps of inserting the box culvert, propelling the box culvert by the intermediate pushing device, and propelling the open shield machine are performed until the propulsion open shield machine and a part of the front box culvert group which follows the propulsion open shield machine completely cross the obstacle. Repeated for.

With this, new box culverts can be sequentially inserted in the open groove before the obstacle, so that the box culverts can be sequentially installed in the open groove regardless of the existence of the obstacle. Box culverts can also be buried in the object area.

[0011]

However, in the above-mentioned conventional construction method, when the propulsion open shield machine and a part of the front box culvert group which follows the propulsion open shield machine completely crosses the obstacle, the middle pushing device is removed, and the middle pushing device is removed. It is necessary to insert a predetermined number of box culverts from above between the existing box culverts in the rear of and the box culverts in the front of the intermediate pushing device to continuously connect both the box culverts.

Therefore, after a predetermined number of box culverts are inserted between the two box culvert groups so as to sandwich the seal members therebetween, from above the open cut groove,
Although it is pressed against the existing box culvert and is connected to it via a joint, etc., the box culvert inserted at the end and at least one box culvert of the box culverts located at its both ends that are continuous with this Even if a seal member is interposed, a relatively large gap is created between them.

In order to fill this gap, conventionally, it is indispensable to form a form on both sides of both box culverts except for the top covered with a top plate and pour concrete into the bottom of the form and box culverts. And
Work efficiency was reduced.

An object of the present invention is to solve the above conventional problems, and a box culvert combination for an open shield method capable of efficiently performing the open shield method even under an obstacle such as a bridge. To provide.

[0015]

The present invention is a box culvert combination for the open shield construction method, and is configured as follows to solve the above-mentioned technical problems. That is, the present invention is a rear box provided with a blade that penetrates into the face to stabilize the face when excavating the face groove by a ground excavator and is installed in the face groove according to the progress of the excavation. It is a box culvert combination used in an open shield construction method using an open shield machine that is advanced while carrying a reaction force to the culvert, and an intermediate pushing device that pushes a box culvert that is installed behind the open shield machine. .

This box culvert combination of the present invention is provided with a space for continuously connecting a front box culvert group pushed forward by an intermediate pushing device and a rear existing box culvert group spaced apart from the box culvert group. It is a combination of one insertion box culvert inserted from above between the group of box culverts on which the box culvert is placed, and a box culvert adjacent to this insertion box culvert, and on both sides of the end face of either one of the box culverts, A ridge extending in the vertical direction is provided, and a concave ridge extending in the vertical direction for receiving the ridge is provided on both sides of the end face end of the other box culvert (claim) (Corresponding to item 1). Hereinafter, each component will be described.

(Box culvert) A box culvert is a hollow rectangular box, which is hollow when viewed from a cross section made of, for example, reinforced concrete, which constitutes a wall of an underground structure such as a waterway or a tunnel. By doing so, it is used to form a wall that is continuous in the longitudinal direction of the underground structure.

(Box Culvert Combination) A box culvert combination is provided with a group of box culverts in front of the group in order to form a wall continuous in the longitudinal direction of an underground structure such as this waterway or tunnel. It is used to continuously connect both box culvert groups to and from the rear box culvert group to be placed, and is composed of at least two box culverts arranged continuously.

On both sides of one end face of the one box culvert, there are provided ridges extending vertically and reaching the upper end and the lower end, and on the other sides of the other face of the other box culvert. Is provided with a recessed portion for receiving. The groove portion extends in the vertical direction of the Bock culvert provided with the groove portion and reaches the upper end and the lower end thereof.

Therefore, both box culverts can be combined so as to fit the concave streak and the convex streak provided on the respective end faces in the vertical direction along the vertical direction.

In the box culvert combination of the present invention, one of the box culverts is one of the box culverts in the front and the group of box culverts in the rear which are spaced apart from the group of box culverts, which is the one located closest to the space. The concave ridges or convex ridges, which are the fitting portions, are arranged facing the gap side so that the other box culvert of the box culvert combination can be received within the gap.

The other box culvert of the combination of box culverts is entirely fitted from the upper side to the lower side in a state in which the convex ridges or concave ridges, which are the fitting portions, are fitted to the fitting portions of the one box culvert. The two box culverts that are combined and form the box culvert combination are fitted to each other at the fitting portions on both sides thereof.

Therefore, there is no gap between the both sides of the box culverts fitted to each other as in the conventional case, and concrete is poured to fill the gap between the both sides and a formwork for that is assembled. The work can be eliminated, the open shield method can be efficiently performed even under an obstacle such as a bridge, and the work efficiency can be significantly improved.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION A box culvert assembly for an open shield method according to the present invention will be described in more detail below with reference to an embodiment shown in the drawings. FIG. 1 is a perspective view showing a box culvert combination body 10 used in the open shield construction method of the present invention. Prior to description of the box culvert combination body 10, the open shield construction method in which the box culvert combination body 10 is used. Will be schematically described with reference to FIG.

The open shield construction method is applied to construct a structure 12 such as a water channel or a tunnel in a relatively shallow portion of the ground 11, as shown in FIG. The structure 12 constitutes the wall body, for example, a box culvert 13 (13A, 13A) made of reinforced concrete.
It is formed by continuously burying B) in the ground.

In order to continuously install the box culverts 13 in the ground, an open shield machine 14 is used in the open shield construction method, and the box culverts 13 are continuously crossed below an obstacle such as a bridge 15. The intermediate pusher 16 is used in combination to be embedded in the.

As is well known in the art, the open shield machine 14 includes a frame body 17 and a pair of blades 19 which are held so as to project forward from the frame body when the hydraulic jack device 18 is operated. And a hydraulic jack device 20 for propelling the frame body 17 forward. The pair of blades 19 are pushed into the face 21 by the extension operation of the hydraulic jack device 18.

The cutting face 21 stabilized by the penetration of the blade 19 is excavated by an excavating device (not shown) such as a backhoe, and the excavation groove 22 extends approximately one pitch corresponding to the thickness T of the box culvert 13. Then, the blade 19 is once retracted for the forward movement of the open shield machine 14, and the hydraulic jack device 20 as the propulsion device extends.

In the hydraulic jack device 20, when the rear box culvert 12 is pushed through the push plate 23 at the rear end, the open shield machine 14 is advanced by the extension of the excavation groove 13 by the reaction force of the box culvert 12. . In the illustrated example, the frame 17 includes a front portion 17a and a rear portion 1 so that the open shield machine 14 can be applied to a curved digging groove.
It is divided into 7b.

The two parts 17a and 17b are connected to each other by a relay jack device 24 so that the front part 17a can be angularly advanced or swung in the horizontal plane with respect to the rear part 17b.

After the forward movement of the open shield machine 14, the blade 19 extends again, and the subsequent excavation of the excavation groove 22 is restarted. Subsequently, when the hydraulic jack device 20 is operated from the extended position shown by the phantom line in FIG. 2 to the retracted position shown by the solid line, between the push plate 23 of the hydraulic jack device 20 and the box culvert 13 behind it. The new box culvert 13 is suspended from above in the excavation groove 22 by a suspension device (not shown) such as a crane device.

The push plate 23 is pressed against the newly arranged box culvert 13 to open the shield machine 14.
Moves forward. By repeating these steps, when a structure to be crossed approaches, for example, the bridge 15, in front,
In addition to the open shield machine 15, a middle push device 16 is used.

In response to the progress of the excavation work in front of the open shield machine 15 and the forward movement of the open shield machine, the intermediate pushing device 16 is extended by a plurality of intermediate pushing jack devices 26 fixed to the frame body 25 of the intermediate pushing device 16. The existing box culverts 13A at the rear of the apparatus are made to bear the reaction force, and the box culverts 13B which are sequentially inserted immediately after the intermediate pushing apparatus 16 from above in each of its repetitive operations are sequentially pushed forward in a lump.

Therefore, each time the intermediate pressing process by the intermediate pressing device 16 is repeated, the number of box culverts 13B that are collectively pushed forward by the intermediate pressing device 16 increases, and the open shield machine 14 and the subsequent box culvert 13B move forward accordingly. However, since the insertion of the new box culvert 13B is performed immediately before the intermediate pushing device 16 in the predetermined stationary position, the digging groove 22
The insertion of a new box culvert into the interior by suspension is not obstructed by the bridge 15.

When the open shield machine 14 passes through the bridge 15 and the group of front box culverts 13B following it is continuously installed below the bridge 15, the intermediate pushing device 16 is removed from the excavation groove 22, A predetermined number of box culverts 13 are inserted between the rear box culvert 13A group and the front box culvert 13B group to connect both groups.

In the example shown in FIG. 3, a new box culvert 13-1 is provided immediately after the front box culvert 13B.
Was inserted, and this inserted box culvert 13-
The last box culvert 13-2 for connection is about to be inserted between 1 and the rear box culvert 13A. The box culvert 13-1 has a space to press the box culvert 13-1 against the box culvert 13B in a state where a seal member (not shown) is arranged between the box culvert 13B and an adjacent box culvert 13B.

However, regarding the box culvert 13-2 that is finally inserted, the box culvert 13-2
-1 and the box culvert 13A, a gap larger than the thickness T of the box culvert 13-2 is left, but it is necessary to surely arrange the seal member at a predetermined position. It's not easy.

The box culvert 13-2 inserted at the end and the box culvert 13-adjacent to the box culvert 13-2 are inserted.
1 and the box culvert combination 10 shown in FIG.
Is used. On one end face of the one box culvert 13-1, a pair of concave streak portions 27 extending linearly continuously in the vertical direction are formed on both side portions thereof. Each groove 27 reaches the upper end and the lower end of the box culvert 13-1.

Such a box culvert 13-1
Can be easily formed by attaching a thin styrofoam plate (not shown) conforming to the end face shape of the box culvert to a concrete formwork.
Therefore, both box culverts 13-1 have a special shape different from the generally used box culvert 13.

On the end face of the other box culvert 13-2, a pair of convex ridges 28 corresponding to the concave ridges 27 are formed, and each convex ridge 28 continuously extends linearly to form a box culvert. Reach the top and bottom of 13-2. This box culvert 13-2 is also the same, and a box culvert in which the concave streak portion 27 is formed on the outer end surface can be easily provided by attaching a styrofoam plate corresponding to the end surface shape to the concrete form.

The groove portion 27 has a depth dimension sufficient to receive the rib portion 28, and the box culvert 13-1 is provided so that the groove portion 27 and the rib portion 28 are fitted to each other.
And 13-2 can be put in mutually from the up-down direction. Therefore, as shown in FIG. 3, the box culvert 1 has a posture in which the concave streak portion 27 and the convex streak portion 28 face each other.
The ridge portion 28 of 3-2 can be fitted into the groove portion 27 of the box culvert 13-1 so as to be slid from above.

At the time of this fitting, the concave streak portion 27 and the convex streak portion 28 guide the box culvert 13-2, so that the insertion work of the last box culvert 13-2 can be easily performed. it can.

Further, in the fitted state, the convex ridge portion 28 continuously extending from the upper end to the lower end of the box culvert 13-2 is similarly formed on the concave ridge portion 27 extending continuously from the upper end to the lower end of the box culvert 13-1. Both box culverts 13-1 and 13-2 have been accepted.
Since it is possible to eliminate the work of placing concrete to close the gap between the two sides, and the work of assembling the formwork associated therewith, it is possible to open efficiently even under obstacles such as bridges. The shield construction method can be performed, and the work efficiency can be significantly improved.

As shown in FIG. 3, the ridge 28 is formed on the box culvert 13-2 which is finally inserted,
The concave ridge portion 2 is provided on the box culvert 13-1 which is installed in advance so as to be continuous with the existing box culvert 13B.
Although the example in which No. 7 is formed is shown, the relationship between the two can be reversed and the box culvert 13-1 can be inserted at the end.

Further, the concave ridges 27 and the convex ridges 28 can be formed on the end surfaces of the box culvert 13-2 inserted last and the other box culvert 13A adjacent thereto, which face each other.

[0046]

As described above, according to the box culvert combination for the open shield method of the present invention,
By fitting both sides of both box culverts, which require the assembly of the formwork to fill the gap with the cast concrete, by fitting the concave and convex ridges that vertically penetrate both sides at the end face of the corresponding box culverts. By connecting them to each other, it is possible to prevent a gap from being generated between the box culverts without hindering the insertion work from above.

Therefore, it is possible to eliminate the most troublesome work of placing concrete on both sides of the box culvert. As a result, the open shield construction method can be efficiently performed even under an obstacle such as a bridge, and the construction period and cost can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing a box culvert assembly for an open shield method according to the present invention.

FIG. 2 is a plan view schematically showing an open shield construction method in which the box culvert assembly for the open shield construction method of the present invention is used.

FIG. 3 is a side view of a box culvert group showing a usage mode of the box culvert combination body for the open shield method of the present invention.

[Explanation of symbols]

10 Box Culvert Combination 13 (13A, 13B, 13-1, 13-2) Box Culvert 14 Open Shielding Machine 15 (Bridge) Obstacle 16 Middle Pushing Device 19 Blade 21 Cutting Face 22 Excavation Groove 27 Recessed Line 28 Convex Line

Claims (1)

[Claims] 1. A rear box provided with a blade penetrating into the face to stabilize the face when excavating the face groove by a ground excavator and installed in the face groove as the excavation progresses. In an open shield construction method using an open shield machine that is advanced while carrying a reaction force to the culvert, and an intermediate pushing device that pushes forward the box culvert installed behind the open shield machine, in the forward direction by the intermediate pushing device. One insertion box culvert inserted from above between the box culvert groups spaced to continuously connect the pushed forward box culvert group and the existing rear box culvert group spaced apart from the box culvert group. , Next to the insertion box culvert of the box culvert group A box culvert in combination with a ridge that extends vertically and reaches the upper and lower ends of the box culvert on both sides of the end face of one of the box culverts, and the other box culvert. On both sides of the end face of the culvert, for the open shield construction method, which is provided with concave ridges that extend in the vertical direction and reach the upper and lower ends of the box culvert and receive the convex ridges from the vertical direction. Box culvert combination.