JP2010261267A - Element launching stand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely perform replacement and positioning a launching stand when a tunnel, in which a pit mouth is opened on a slope, is constructed by an element-pulling method. <P>SOLUTION: This element launching stand includes: a slide stages 21 which is loaded with the element 3, and which can be sequentially replaced obliquely downward and backward along the slope; a rail 22 which is installed in an inclined state along the slope, and which slidably supports the front of the slide stage obliquely downward and backward along the slope; a plurality of supports 23 which are disposed on both the sides of the slide stage; and a plurality of tiers of brackets 24 which are installed in the supports, and which are disposed by vertically changing positions. Vertical intervals among the plurality of tiers of brackets are set in advance to correspond to the height dimensions of the respective tiers of elements. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tunnel construction technique, and more particularly to an element starting stand applied to a so-called element pulling method.

For example, Patent Document 1 discloses an element pulling method as a non-open-cutting tunnel method.
This is to construct a tunnel by excavating the inside after arranging a large number of elements connected along the tunnel outline by pulling the elements of square cross section from the starting position and penetrating into the ground sequentially. However, it has been widely used as a construction method for an underpass, which is a relatively small tunnel that crosses under an existing track or road.

In particular, in the element pulling method shown in Patent Document 1, a traversable starter truck is installed at the start position of the element, and the element is pulled from the starter truck toward the ground. At the time of construction, the elements are arranged in the horizontal direction by sequentially moving the starting cart in the horizontal direction.
In addition, by making the starting cart not only traversable but also raising and lowering, when constructing the side wall version of the tunnel, the elements can be arranged in the vertical direction by lowering the starting cart sequentially. Yes.

Japanese Patent Laid-Open No. 2003-262084

By the way, when the tunnel entrance to be constructed by the element pulling method is open in the vertical plane as in a normal tunnel, as shown in Patent Document 1, the starting carriage is simply lowered when the side wall plate is constructed. It is possible to arrange the elements in the vertical direction by allowing them to be constructed efficiently.
However, if the wellhead is open to the slope (inclined surface) as in the case of an underpass crossing under the bank-like track, the length of the element for constructing the side wall plate is Depending on the inclination, not only the lower one becomes longer, but also the penetration position of each element into the slope becomes backward as the lower one.
Therefore, when penetrating elements with the elements arranged in the vertical direction with respect to the slope, it is necessary not only to lower the starting carriage but also to retract along the slope every time the elements of each stage are penetrated. For this reason, it is not possible to use a simple starter truck as shown in Patent Document 1 as it is, and a considerable effort and cost are required for the replacement work and positioning work of the starter base.

  In view of the above circumstances, when constructing a tunnel in which a wellhead opens to a slope by an element pulling method, the present invention can perform refilling and positioning easily and reliably, and can effectively improve workability. The purpose is to provide a simple element starting stand.

  The present invention is applied to an element pulling method in which a tunnel is constructed by pulling an element, penetrating into the ground, connecting a number of elements and arranging them along a tunnel outline, and a rectangular opening having a wellhead opening on a slope. A starting stand for sequentially arranging elements for forming a tunnel side wall plate from the slope side when arranging a cross-section tunnel, and arranging the elements in the vertical direction, the element can be mounted and along the slope A slide stage that can be repositioned obliquely downward and rearward, and a rail that is installed in an inclined state along the slope and supports the front portion of the slide stage slidably downward and rearward along the slope. A plurality of support columns arranged on both sides of the slide stage, and arranged on the support columns while changing the position in the vertical direction. And a plurality of brackets that support the rear portion of the slide stage in a horizontal posture, and the vertical distance between the brackets is set corresponding to the height dimension of each stage element. .

  In the present invention, at the rear part of the slide stage, a support beam whose both ends are engageable and disengageable with respect to the brackets of each stage is installed so as to be rotatable in a horizontal plane, and the rear part of the slide stage is interposed via the support beam. It is preferable to be able to be supported by the bracket of each step.

  In the present invention, it is preferable that at least the rear part of the slide stage is suspended from the support column by a chain block so that the slide stage can be replaced by the chain block.

  According to the transmission stand of the present invention, the front part of the slide stage is supported by the rail inclined along the slope so that the slide stage can be lowered, and the rear part of the slide stage is secured with a vertical distance corresponding to the height dimension of the element. Since the slide stage is supported step by step by a plurality of brackets arranged in a row, the slide stage can be easily replaced. Therefore, it is possible to easily and reliably position the slide stage in each stage in the vertical direction and the front-rear direction when penetrating the elements in each stage.

  In addition, a support beam that can be turned at the rear part of the slide stage is provided and is configured to be engaged and disengaged with respect to the bracket by turning the support beam, so that the rear part of the slide stage is stably and surely secured to the bracket through the support beam. When the slide stage is replaced, the bracket can be dodged by turning the support beam, so that the replacement operation is not hindered.

  Furthermore, by constructing the slide stage so that it can be replaced by a chain block, it can be easily replaced without the need for large heavy machinery such as cranes, and in this respect it is possible to improve workability. is there.

The embodiment of the present invention is shown, and is a diagram showing a tunnel (underpass) to be constructed and its cross-sectional shape. It is a top view which shows the construction condition of a side wall version similarly. It is sectional drawing which shows the construction condition of a side wall version similarly. It is an elevation view which shows a starting stand same as the above. It is a figure which shows the front part of the start stand. It is a figure which shows the rear part of the start stand.

An embodiment of the present invention will be described with reference to FIGS.
This embodiment is an application example in the case of constructing a tunnel as an underpass crossing under a bank-shaped railroad as shown in FIG. 1 (a), and an upper floor slab 1 as shown in (b). And the side wall slabs 2 on both sides are formed by the arrangement of the elements 3 respectively, and the bottom floor slab 4 and the inner partition slab 5 are formed by in-situ concrete construction.
In the present embodiment, the upper floor slab 1 and the side wall slab 2 are basically constructed by the element traction method shown in Patent Document 1, but both side surfaces of the railroad track are sloped surfaces. From the slope, each element 3 needs to penetrate into the ground, and in particular, the penetration of the element 3 for forming the side wall plate 2 is inclined to the slope. In this embodiment, the side wall plate element 3 is penetrated into the slope by using a special starting frame.

In the present embodiment, when the side wall slab 2 is constructed, as shown in FIGS. 2 and 3, the reaching platform 10 and the both sides (the reaching side and the starting side) sandwich the railroad track at the position where the side wall slab 2 is to be constructed. The starting stand 20 is arranged oppositely.
The reaching platform 10 has an elevating stage 12 on which a traction jack 11 is mounted. The traction reaction force is taken from the reaction force pile 13 installed in front of the reaching platform 10 and the element 3 is placed on the starting platform 20 by a PC steel stranded wire 14. It is towed into the ground, and the elements 3 at each stage are sequentially pulled and arranged in the vertical direction by lowering the elevating stage 12 stepwise by a dimension corresponding to the height of the element 3 at each stage. It is configured as follows.

  On the other hand, the starter base 20 has a slide stage 21 on which the element 3 to be pulled is mounted. As shown in FIG. However, in this case, the slide stage 21 is not simply lowered directly below, but in a stepwise rearward step according to the slope of the slope. It is configured to retreat.

  That is, the starter base 20 is installed in an inclined state along the slope and has a rail 22 for supporting the front part of the slide stage 21 so as to be able to descend obliquely rearward, and a plurality of arrays arranged on both sides of the slide stage 21. And a plurality of stages (five stages in the illustrated example) of brackets 24 that support the rear portion of the slide stage 21 stepwise by being arranged in a state of being substantially parallel to the rails 22. It is comprised by.

As shown in FIGS. 5 to 6, the slide stage 21 has a stage plate 33 fixed on a main frame 30 made of a steel frame via a subframe 31, and its upper surface can easily pull the element 3. Is sufficiently smooth.
As shown in FIG. 5, a leg 34 is provided at the front of the slide stage 21 and a wheel 35 is provided at the lower end thereof. When the slide stage 21 is replaced, the wheel 34 is connected to the rail. The entire slide stage 21 descends obliquely rearward along the rail 22 by rolling on 22.
As shown in FIG. 6, the center of the support beam 36 is pivotally supported by a turning shaft 37 at the rear portion of the slide stage 21 so as to be turnable in a horizontal plane. The support beam 36 is slightly longer than the width dimension of the slide stage 21, and both ends of the support beam 36 can be engaged with and disengaged from each of the brackets 24 of each step, and pull the element 3 of each step. In this case, as shown in (a) and (c), the rear part of the slide stage 21 is supported by engaging both ends of the support beam 36 with the bracket 24, whereby the front part is supported by the rail 22. The slide stage 21 can be held in a horizontal posture.
When the slide stage 21 is replaced, the support beam 36 is detached from the bracket 24 and turned as shown in (b), so that the position of the bracket 24 is changed and the slide stage 21 is lowered obliquely backward. It is allowed.

The rail 22 that supports the front portion of the slide stage 21 is made of a steel frame, is supported by a bracket 32 with respect to the support column 23, and is installed in an inclined state. A concave groove is formed to prevent the wheel 35 from falling off and to guide the descent.
In addition, the vertical distance between the brackets 24 at each stage that supports the rear portion of the slide stage 21 via the support beam 36 is set so as to exactly match the height dimension of the element 3 at each stage. Therefore, they are arranged in a state of being inclined in substantially the same manner as the rail 22 (that is, in a state of substantially matching the inclination of the slope).
The brackets 24 of the respective steps are laterally extended so as to straddle the main bracket 38 fixed to the above-mentioned support pillar 23 made of steel frames that are driven into the ground and arranged at substantially equal intervals, and two adjacent main brackets 38. It consists of a sub-bracket 39 of a predetermined length that is suspended and fixed, and the engagement position of the support beam 36 (support point of the slide stage 21) can be adjusted back and forth within the range of the length of the sub-bracket 39. .

In this embodiment, the slide stage 21 can be replaced by operating the chain block 40 without using a heavy machine such as a crane.
That is, as shown in FIGS. 5B and 6, the front part and the rear part of the slide stage 21 can be suspended from the column 23 by the chain block 40, respectively, and when the slide stage 21 is replaced, FIG. From the state shown in (a), the rear part of the slide stage 21 is slightly lifted by operating the chain block 40 on the rear side, and the support beam 36 is turned in a state in which the support beam 36 is disengaged from the bracket 24. By operating the chain block 40 in synchronism, the entire slide stage 21 may be guided by the rail 22 while being held in a horizontal position and lowered obliquely backward. Then, as shown in (c), when the support beam 36 is engaged with the lower bracket 24, the replacement of one stage is completed, and the slide stage 21 is naturally placed in a horizontal posture and supported by the rail 22 and the bracket 24. Will be.

  As described above, according to the start stand 20 of the present embodiment, the front portion of the slide stage 21 is supported by the rail 22 inclined along the slope so that it can be lowered, and the rear portion of the slide stage 21 is supported by the element 3. Since it is configured to support stepwise by a plurality of brackets 24 having a vertical interval corresponding to the height dimension, when the slide stage 21 is replaced, the slide stage 21 is lowered along the rails 22 so as to be obliquely rearward at the same time. The lower stage bracket 24 is naturally retracted and positioned by the lower bracket 24. Therefore, it is possible to easily and reliably position the slide stage 21 in the vertical direction and the front-rear direction when the element 3 of each stage penetrates.

  In addition, since the support beam 36 that can be swiveled is provided at the rear portion of the slide stage 21 and is configured to be engaged and disengaged with respect to the bracket 24 by swiveling the support beam 36, the rear portion of the slide stage 21 is interposed via the support beam 36. Thus, the bracket 24 can be supported stably and reliably, and when the slide stage 21 is replaced, the bracket 24 can be displaced only by turning the support beam 36, so that the replacement operation is not hindered.

Furthermore, since the slide stage 21 can be replaced by the chain block 40, it can be easily replaced without requiring a large heavy machine such as a crane, and in this respect, the workability can be improved. is there.
In the above embodiment, both the front part and the rear part of the slide stage 21 are suspended by the chain block 40 at the time of replacement, but the front part of the slide stage 21 is always lowered while being supported by the rail 22. Therefore, at least only the rear part of the slide stage 21 can be suspended by the chain block 40 and replaced only by the operation. In this case, the chain block 40 that suspends the front part can be omitted.

  Further, in the above embodiment, as shown in FIG. 4, when the lowermost (sixth) element 3 is inserted, the slide stage 21 is removed from the rail 22 and the bracket 24 and the ground surface (on the pit bottom surface). Therefore, the length of the rail 22 is set to be shorter and the lowermost bracket 24 is omitted, but the length of the rail 22, the number of steps of the bracket 24, Needless to say, the shape and position of the bracket 24 and the vertical distance between the brackets 24 may be appropriately set for each site corresponding to the number of steps of the element 3 to be pulled, the respective height dimensions, and the inclination angle of the slope. .

DESCRIPTION OF SYMBOLS 1 Upper floor slab 2 Side wall slab 3 Element 4 Bottom floor slab 5 Bulkhead board 10 Reaching base 11 Towing jack 12 Lifting stage 13 Reaction force pile 14 PC steel strand 20 Launch base 21 Slide stage 22 Rail 23 Post 24 Bracket 30 Main frame 31 Sub Frame 32 Bracket 33 Stage plate 34 Leg 35 Wheel 36 Support beam 37 Rotating shaft 38 Main bracket 39 Sub bracket 40 Chain block

Claims (3)

It is applied to the element pulling method that constructs a tunnel by pulling the element and penetrating into the ground, connecting a number of elements and arranging them along the tunnel outline, and a tunnel with a rectangular cross section with a wellhead opening to the slope. It is a starting stand for arranging elements for forming a tunnel side wall plate at the time of construction from the slope side in order and arranging them vertically.
A slide stage on which the element can be mounted and can be sequentially repositioned obliquely downward and rearward along the slope;
A rail that is installed in an inclined state along the slope and supports the front portion of the slide stage so as to be slidable obliquely downward and rearward along the slope;
A plurality of support columns arranged on both sides of the slide stage;
A plurality of brackets that are installed on the support columns and arranged in different positions in the vertical direction, and support the rear portion of the slide stage in which the front portion is supported by the rail as a horizontal posture;
An element starting stand, wherein the vertical spacing of the brackets is set in accordance with the height dimension of each stage element. The element starting stand according to claim 1,
At the rear part of the slide stage, a support beam whose both ends are engageable and disengageable with respect to the brackets of each stage is installed so as to be able to turn in a horizontal plane, and the rear part of the slide stage is bracketed to each stage via the support beams. An element starting stand that is supported by An element starting stand according to claim 2,
An element starting stand, wherein at least a rear portion of the slide stage is suspended from the column by a chain block, and the slide stage can be replaced by the chain block.

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