JP2000303795A - Center truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center truck which assures a space to pass a conveyor, while maintaining sufficient support strength of a form part. SOLUTION: Columns 26A, 26B disposed on one side of a truck are localized at the center of the truck, and a space S for passing a conveyor is secured in a space between a form part 21 and a gate-shaped frame part 20 on the one side of the truck, so that a long belt conveyor 13 can be passed into the truck 10 without impeding the function of the internal space of the gate-shaped frame part 20 to serve as a passage. Moreover, the part of a form supporting part 22 disposed on the side of the space S to pass the conveyor is of a high- strength structure, so that the space S to pass the conveyor can be secured while sufficient support strength of the form part 21 is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal trolley, and more particularly to a centrifugal trolley which is a traveling formwork used for placing concrete on a tunnel wall after excavation.

[0002]

2. Description of the Related Art Conventionally, the following excavation method is known as a tunnel excavation method. That is, (1) NAT
M section method (blasting excavation, mechanical excavation)
(2) TBM method (concrete segment lining) in which tunnel excavation is performed by a machine, (3) other various conventional methods.

[0003] The tunnel dug by the full section method of (1) and the conventional method of (3) is used to cover the tunnel wall by using a sheet-stretched work vehicle running on a rail laid on the tunnel roadbed. Concrete is cast on the inner wall surface of the tunnel using a centrifugal trolley that is covered with a waterproof sheet and then has a formwork on the inner surface of the tunnel. The structure of this centro cart is mainly composed of a portal frame (with a self-propelled device) that travels inside the tunnel after excavation, an arch-shaped frame for concrete placement, and a gate-shaped frame. And a form supporting portion supported on the outer periphery of the frame portion.

[0004] Dust and toxic gas generated near the face of the tunnel are discharged to the outside of the tunnel through a long wind pipe provided in the tunnel by the negative pressure of a fan mounted on the ventilation cart. You. These ventilation trolleys, seat-stretching trolleys, and centre trolleys are all portal trolleys in which the upper ends of a pair of columns are connected using a girder. Therefore, the slip generated during the excavation is loaded on the bed of the dump truck, and then the track sequentially passes through the internal space of each bogie, so that the slip is transported to the outside of the tunnel by the piston.

[0005]

By the way, in the transportation of the piston by the dump truck using such a dump truck, for example, the work of loading and unloading the waste from the dump truck onto the truck bed is troublesome, and the transportation efficiency of the waste is low. Therefore, in recent years, a method has been developed in which a special belt conveyor capable of freely adjusting the length of the endless belt is used to efficiently transport the slip out of the tunnel. The special belt conveyor referred to here derives an extended endless belt from the belt storage cassette arranged near the pit, according to the length of tunnel digging, but only as much as this endless belt is extended The endless belt is internally held by a belt holding roller to extend the conveyor.

The belt storage cassette is an endless belt length adjusting device. Inside the belt storage cassette, a part of the back belt of the endless belt is stored in a folded state between many pairs of rollers. Thus, when the belt conveyor is extended with the progress of the tunnel excavation, the extended endless belt is fed out from between the rollers in the belt storage cassette. The belt conveyor is held by a number of trussed steel members bolted to the inner surface of the tunnel at regular intervals.

[0007] However, in the conventional Sentle cart,
At the time of the design, a space for inserting the belt conveyor was not secured. In other words, the large internal space of the gate-shaped center truck has a passage-like role of carrying in and out various types of excavating equipment using a vehicle or the like, in addition to entering and exiting the dump truck. Therefore, a space for inserting the belt conveyor cannot be secured in this internal space. In addition, in the conventional center truck, there is no dimensional allowance in the gap between the formwork on one side of the tunnel and the portal frame so that the belt conveyor can pass through.

Therefore, as a result of earnest research, the inventor considered to increase the gap between the mold on one side of the tunnel and the portal frame, and pass the belt conveyor through the enlarged space. However, it has been found that simply changing the design in this way causes a strong obstacle to the Sentle bogie. That is, in order to secure a space for inserting the conveyor, one of the columns disposed on one side of the truck must be unevenly distributed toward the center of the truck. This means that the portion of the form supporting portion disposed on one side of the bogie is lengthened. However, simply increasing the length of the form support portion causes a shortage of strength in the form support portion due to the role of the form support portion for supporting a heavy formwork portion. There is a concern that it becomes impossible to support the load from the formwork part inside, and that a part of the formwork support is cracked or bent.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a centrifugal trolley capable of securing a space for inserting a conveyor while maintaining a sufficient supporting strength of a mold section.

[0010]

According to a first aspect of the present invention, there is provided a portal-type frame portion having a column arranged on a vehicle side and traveling in a tunnel after excavation, and a wall surface of the excavated tunnel. The centrifugal bogie provided with an arch-shaped form part serving as a form for placing concrete on the concrete and a form supporting part for supporting the form part on the outer periphery of the gate type frame part. One of the pillars arranged in a pair is unevenly distributed toward the center of the bogie, and a transport conveyor for carrying out the slip generated during excavation is inserted into the space between the formwork and the portal frame on one side of the bogie. Space for the conveyor
This is a centrifugal trolley in which a portion of the form supporting portion disposed on the side of the conveyor insertion space has a higher strength structure than a portion on the opposite side of the conveyor insertion space.

The tunnel excavation method is not limited. For example, the present invention can be applied to a whole section method or a part of a conventional method. However, TBM method shall be excluded. The portal frame may be a self-propelled bogie equipped with a motor or a tow bogie that is towed by the self-propelled bogie. The type of travel of the portal frame may be such that wheels travel along rails laid on the tunnel roadbed or tires may travel on the tunnel roadbed. Further, the size and structure of the portal frame portion are not limited as long as the portal frame portion has a portal shape having a pair of columns. Also, the size and shape of the mold section are not limited. For example, 1
It may be such that the inner wall of the tunnel can be collectively covered with a single formwork. Further, the inner wall of the tunnel may be divided into two, three, or more in the circumferential direction of the inner wall (or the length of the tunnel), or may have a structure in which molds are connected.

The structure for supporting the formwork by the formwork support is not limited. For example, one in which a predetermined number of hydraulic cylinders are arranged at appropriate locations can be employed. The concrete poured into the gap between the inner wall of the tunnel and the formwork is not limited. For example, concrete for secondary lining of general-purpose tunnels in which various cements and aggregates or fine aggregates and water are kneaded is used. In other words, the space between the formwork portion and the gate-shaped frame portion is a space in which a formwork supporting portion that supports the formwork portion protrudes from the gate-shaped frame portion. Also, the form of the transport conveyor is not limited as long as it can transport the waste. For example, a belt conveyor, a chain conveyor, or the like can be employed. further,
This conveyor may or may not have the function of adjusting the conveyor length. However, in the case of a transport conveyor whose length cannot be adjusted, it is necessary to sequentially arrange short conveyors in line with the progress of tunnel excavation.

[0013] The degree of unevenly distributing the columns on the side of the conveyor insertion space toward the center of the bogie, and the portion of the mold supporting portion disposed on the side of the conveyor insertion space, are changed to the opposite side of the side of the conveyor insertion space. The degree to which the strength is higher than that of the portion is not limited. The point is that the amount of uneven distribution of the pillars is an amount that can secure a space through which the conveyor can pass in the space between the frame part on one side of the portal frame part and the portal frame part, and the part of the frame support part. It is sufficient that the strength increase amount is an amount that can support the formwork portion without any trouble by the formwork support portion elongated by the uneven distribution of the columns. In addition, as a specific example of forming the mold supporting portion with high strength, a member (for example, a screw jack or the like) connecting the mold portion and the portal frame portion may have a larger cross-sectional area, or may have a rigid member. For example, when the connecting member is a jack or a cylinder, the protruding output of the rod is increased. by the way,
In addition to increasing the strength of the form support, the portal frame to which the form support is attached may have a high strength structure.
Specifically, the thickness of the constituent plate material of the portal frame, the use of a high-rigidity member, or the provision of a reinforcing member may be mentioned.

[0014]

According to the present invention, one of the columns arranged opposite to the portal frame is biased toward the center of the bogie so that the space between the formwork on one side of the portal frame and the portal frame. Since a space for inserting the conveyor is secured, a long transport conveyor for carrying out the slip can be passed through the center truck without obstructing the passage function of the internal space of the portal frame. In addition, since the portion located on the conveyor insertion space side of the form support has a higher strength structure than the part opposite to the conveyor insertion space side, the support strength of the form part is sufficiently maintained However, it is possible to secure a space for inserting the transport conveyor.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a trolley according to an embodiment of the present invention. FIG. 1 is a front view (the right half in the figure is shown in cross section) of a centur truck according to one embodiment of the present invention. FIG. 2 is an explanatory diagram showing a state in use of a tunnel excavation facility to which the centur truck according to one embodiment of the present invention is applied.

In FIG. 2, reference numeral 10 denotes a sentry truck as a movable form truck for casting concrete on the wall surface of a tunnel having an upper half radius of 4.5 m. Here, it is applied to the secondary lining of tunnel excavation by the blasting method.
That is, in this blasting method, a gunpowder is put into a hole drilled in the bedrock and crushed, and this is crushed by a self-propelled crusher 11 into a slip having a diameter of 20 cm or less. Thereafter, the waste discharged from the crusher 11 passes through a short inclined belt conveyor 12, and extends over substantially the entire length of the tunnel, and is an endless belt 13 of a continuous conveyor belt conveyor (transport conveyor) 13.
a is dropped on one end of a. Then, the debris is discharged from the tunnel entrance through the conveyor 13 to the outside of the tunnel.

The belt conveyor 13 has a function of adjusting the length of the endless belt 13a. That is, a belt storage cassette 13b is provided near the wellhead of the belt conveyor 13. In the belt storage cassette 13b, a part of the back belt of the endless belt 13a is stored in a folded state between many pairs of rollers. Thus, when the belt conveyor 13 is extended with the progress of tunnel excavation, the extended endless belt 13a is fed out from between rollers in the belt storage cassette 13b.

Further, various tunnel excavating devices are provided in the tunnel. That is, in order from the face side, a ventilation cart 15 that exhausts dust and toxic gas generated near the face from the long vinyl wind pipe 14 to the outside of the tunnel using the negative pressure of the fan 15a,
A sheet-stretched work cart 16 for covering the tunnel wall surface with a waterproof sheet, and the sentry cart 10 are arranged at predetermined intervals. In addition, between the ventilation cart 15 and the seat-stretched work cart 16, between the seat-stretched work cart 16 and the centured cart 10, and the centured cart 1
A number of suspension trucks 17 are arranged at a pitch of 3 m on the wellhead side approaching zero. These suspension carts 17
Is a table for suspending the long belt conveyor 13 via the mounted chain. Further, the support of the belt conveyor 13 in the tunnel portion after the concrete is cast is released from the temporary fixing by the chain, and the frame is directly connected to the concrete wall surface via the truss structure T (see FIG. 1) made of steel. It is done by bolting.

A method for excavating a tunnel using these devices will be described below. Dust and toxic gas near the face of the tunnel are discharged out of the tunnel from the air tube 14 by the negative pressure of the fan 15a of the ventilation cart 15. In this ventilation state, first, the work of covering the tunnel wall surface with the waterproof sheet is performed using the sheet-stretching work cart 16. Then
Formwork part 2 inside tunnel wall by centre truck 10
1 (described later) is set, and concrete is poured. This concrete placing operation is repeated while sequentially moving a predetermined distance toward the face in accordance with the extension of the tunnel. When the tunnel is extended, the endless belt 13 in the belt storage cassette 13b is moved from the face side of the belt conveyor 13 by a winch.
a is pulled out by the extension. At this time, the belt extending at the same time as the excavation is suspended by the chains of the suspension carts 17 except for the bolted portions by the truss structure T. However, at the time of each lining work such as the waterproofing work by the sheet tension work cart 16 and the concrete placing work by the centrifugal cart 10, the chain of the suspension cart 17 is temporarily removed, and these carts 10,
The support is moved to 15 and 16 to perform a predetermined operation.

Referring now to FIG. 1, the trolley 10 according to this embodiment will be described in detail. The left half of the center line in FIG. 1 is a front view, and the right half thereof is a cross-sectional view of a centrifugal trolley. As shown in FIG. 1, the centrifugal trolley 10 mainly includes a portal frame 20 that travels in a tunnel after excavation, and an arch-shaped mold that serves as a mold for placing concrete on the excavated tunnel wall surface. A frame part 21 and a form support part 22 for supporting the form part 21 on the outer periphery of the portal frame part 20 are provided. The portal frame 20 has a portal girder 23 when viewed from the front. Below the four corners of the girder 23, two pairs of moving columns 26A having wheels 25 rolling on rails 24 are provided vertically. Among them, a traveling motor 26a (see FIG. 2) for self-propelling is attached to each of the pair of wellhead-side wheels 25.
Further, fixed columns 26B for bogie positioning are provided vertically at a predetermined pitch, one pair at a time, between the columns 26A below both sides of the girder 23. A low-head journal jack 27 is provided below these fixed columns 26B. With the rod of each low head journal jack 27 protruding,
5 is lifted from the rail 24, so that the trolley 10
Can be positioned at a predetermined position on the rail 24.

Of these columns 26A and 26B, FIG.
A pair of struts 26A, 2 arranged on the left side of
6B is unevenly distributed toward the center of the bogie. That is, from the center in the width direction of the gate-shaped frame part 20, the support 26A on the left side in FIG.
The length a up to 26B is designed to be shorter than the length b from the center point in the width direction of the portal frame 20 to the columns 26A and 26B on the right side in FIG. This is to secure a conveyor insertion space S for passing the belt conveyor 13 in the space between the frame 21 and the portal frame 20 on one side of the bogie. Also, if the length a is shortened in this manner, the columns 26A, 26 on the side of the conveyor insertion space S can be used.
6B may have insufficient strength. Therefore, in this embodiment, the strength of this portion is also increased. That is, each part is reinforced by the reinforcing member, the thickness of the used member is increased, and the rigidity of the member is increased.

Subsequently, the formwork portion 21 is mainly composed of a pair of lower cat steel foams 29A, 2 arranged at the lower portions of both side walls of the tunnel fixed to the tunnel roadbed via fixing members 28.
9B, a pair of side wall steel foams 30A, 30B which are hinged on the lower cat steel foams 29A, 29B and are provided on both side walls of the tunnel, and both ends are formed on the side wall steel forms 30A, 30B. It is constituted by one upper half steel foam 31 which is pivotally mounted via a hinge and is arranged at the upper part of the tunnel.

Each steel foam has a so-called skin plate type structure. That is, as shown in FIG. 3, the steel foam 30A (another steel foam 2)
9A, 29B, 30B, and 31 have the same structure). The rectangular box body has a rectangular face plate 1 having a curved arbitrary width and a flange 2 erected on each side. The face plate 1 is reinforced from the inside by a mold steel 3 having a constant pitch. The thickness of the face plate 1 is designed to withstand the maximum lateral pressure load at the time of placing concrete. Due to the face plate 1, the flange 2, and the mold steel 3, the steel foam 30A has a high-strength structure with little bending even during concrete casting. FIG. 3 is an enlarged perspective view of a steel foam constituting a part of the formwork to be assembled to the centrifugal trolley according to one embodiment of the present invention.

Next, the form supporting portion 22 will be described with reference to FIG. The form support 22 is provided for each steel form 2
9A, 29B, 30A, 30B, and 31 have jacks having different sizes and structures for supporting the inner side from the inside. That is, the jack supporting the lower cat steel foam 29A has four double-pushed types (rods project from both ends of the jack).
And a lower screw jack 34A in which four single-pressing types (rods protrude from only one end) are alternately arranged. Similarly, the jack supporting the lower cat steel foam 29B is a lower screw jack 34B in which four double-pressing types and four single-pressing types are alternately arranged.

On the other hand, middle and upper jacks that support the upper and lower portions of the side wall steel foam 30A are four double-pressed and single-pressed middle screw jacks 35A that support the lower portion of the side wall steel foam 30A, respectively.
It has eight single-pressed upper screw jacks 36A that support the upper part of the side wall steel foam 30A. These jacks 36A are longer than the upper screw jacks 36B described later, but have high strength because they are made of a member having high rigidity.

The middle and upper jacks for supporting the upper and lower portions of the side wall steel foam 30B include four double-pressed and single-pressed middle screw jacks 35B for supporting the lower portion of the side wall steel foam 30B, respectively. It has eight single-pressing upper screw jacks 36B that support the upper part of the side wall steel foam 30B.
The jack supporting the upper half steel foam 31 has a relatively large hydraulic jack 37 with high strength and a relatively small low-head journal jack 38. The hydraulic jack 37 is moved in the direction of the vehicle by a hydraulic traverse device 39 extending on the beam 23 in the direction of the vehicle. As a result, the mold section 21 moves in the direction of the vehicle and can be centered.

Of these jacks, jacks 34A, 35A, 36A on the side of the conveyor insertion space S are provided.
It is preferable to increase the projecting power of each rod. This is because an excessive load received from the formwork 21 side due to the provision of the conveyor insertion space S, particularly a large load received from the formwork 21 side at the time of concrete placement, breaks the screw portion of the jack or causes the rod to break. This is because they are not pushed back. In addition, as described above, in order to secure the space S for inserting the conveyor, the width of the space between the frame part 21 on one side of the bogie and the portal frame part 20 is reduced to the form part 21 on the other side of the bogie.
And it is larger than the width of the space between the portal frames 20. Therefore, the lower and middle screw jacks 34A and 35A on the lower surface of the girder 23 are attached at one end of the portal frame 20 side in order to adjust the space width.
Lower and middle screw jack 34B on the other side of the bogie,
It is slightly outside the gantry from the mounting position of each end of 35B.

Further, the lower and middle screw jacks 34A and 35A are high-strength screw jacks having a slightly larger diameter than the lower and middle screw jacks 34B and 35B. Further, the length of the upper screw jack 36A is also equal to that of the upper screw jack 3A.
It is longer than the length of 6B and has high strength. As described above, since the portion of the form supporting portion 22 arranged on the side of the conveyor insertion space S has a high strength structure, the form
This belt conveyor insertion space S can be secured while maintaining the supporting strength of the belt conveyor sufficiently.

Here, an upper screw jack 36A will be described as an example with reference to an enlarged front view (FIG. 4) of a main part showing a form part, a form supporting part and a connecting part structure according to an embodiment of the present invention. The structure for assembling each screw jack to the formwork 21 will be described in detail. At the tip of the rod 36a of the upper screw jack 36A, a short pressed cylinder-shaped pressing roll 36b is fixed with its axis oriented in a direction orthogonal to the rod length direction. The pressing roll 36b has a connecting pin 36c inserted into a hollow portion of the roll 36b, and an elongated hole 36d into which the connecting pin 36c is loosely inserted.
Through the connecting bracket 36 having a substantially U-shaped cross section.
e is rotatably supported by the shaft.

The connecting bracket 36e has a rectangular backing plate 36f directly connected to the side wall steel foam 30A.
And two parallel connecting pieces 36g erected at right angles on one side of both sides of the backing plate 36f. Each connecting piece 36
The leading end of g has a mountain shape, and the elongated hole 36d is formed in the center of the leading end. The long hole 36d is oriented in the lengthwise direction of the connecting piece 36g. Also,
A tapered cotter 36h having a tapered surface on the side of the pressing roll 36b is loosely inserted into the gap between the pressing roll 36b and the pressing plate 36f. The cotter 36h is welded with a projection 36i for preventing the cotter 36h from coming off. In addition, a high wear resistance, for example, a high manganese-based steel material 36j is weld-welded near the middle of the tapered surface of the cotter 36h. The cotter 36h, which is a base material, is made of, for example, a mild steel material.

When the side wall steel foam 30A is supported by the upper screw jack 36A, first, the rod 36a of the upper screw jack 36A is made to protrude.
Connect the end of the connecting bracket 36e to the side wall steel foam 3.
Contact with 0A. Next, the connection bracket 36e and the backing plate 36f are bolted together. Alternatively, the connecting bracket 36e is fixed to the side wall steel foam 30A in advance, and then the rod 36a is gradually extended. In this way, by inserting the connecting pin 36c into these holes successively at the rod extending position where the elongated hole 36d and the hollow portion of the pressing roll 36b match, the side wall steel foam 3
0A is connected and supported by the upper screw jack 36A.

Then, pressing roll 3 using a hammer
A cotter 36h is driven into the gap between the pad 6f and the backing plate 36f. As a result, the connection pin 36 loosely inserted into the elongated hole 36d
The upper screw jack 36 </ b> A in the stretched state is slightly pushed into the portal frame 20 by the movable length of c. As a result, via the jack 36A, the side wall steel foam 3
OA is cantilevered without play. In addition, at the time of cotter driving, the cotter 3
6h is pressed against the pressing roll 36b. Thereby, even if the cotter 36h is used repeatedly, the cotter 36
h can be prevented from being deformed due to wear.

As described above, the tensioned state of the upper screw jack 36A is made to appear finally by driving with the cotter 36h.
The function of the upper screw jack 36 </ b> A can be sufficiently exhibited in a narrow space, which is a gap between the mold and the frame portion 21, where it is difficult to use a long fastening tool such as a wrench.
In addition, when the formwork 21 is dismantled, the hammer is used to release the driving state of the cotter 36h.
The connection between the side wall steel foam 30A and the upper screw jack 36A is loosened. Thereafter, the connection bracket pin 36c is pulled out, and the upper screw jack 36A is removed from the side wall steel foam 30A. FIG.
, 40 is a work floor, 41 is a handrail, and 42 is a ladder.

Here, the operation of the trolley 10 according to this embodiment will be described. 10 trolleys in the tunnel
Is assembled, the carriage 10 is moved by the wheels 25 to a predetermined position by a traveling motor (not shown). Then
At the same time as the low-head journal jacks 27 fix the center truck 10 at a predetermined position on the rail 24,
The width of the gap between the tunnel wall surface and the formwork 21 is adjusted in the upper part of the bogie. Then, the form-feeding unit 2 is moved
The center 1 is moved toward the bogie side to perform centering, and each gap between the inner wall of the tunnel on the bogie side and the formwork 21 is adjusted. After that, concrete is poured into each gap between the inner wall of the tunnel and the formwork 21 and is poured. Next, the form part 21 is removed from the cast concrete inner surface. Then, after the tunnel is extended by a predetermined length, the centrifugal trolley 10 is moved to the face side by a predetermined distance for the subsequent driving operation, and the trolley 10 is similarly positioned and fixed. In addition,
The belt conveyor 13 is disposed over the entire length of the tunnel through the belt conveyor insertion space S.

As described above, the column 26A on one side of the bogie of the portal frame 20 is biased toward the center of the bogie so that the frame portion 21 on one side of the portal frame 20 and the portal frame 20 are located between the columns 26A. Since the conveyor insertion space S is ensured in the space, the long belt conveyor 13 for carrying out the slip is placed in the centrifugal carriage 10 without obstructing the passage function of the internal space of the portal frame 20. Can be inserted. In addition, for example, the column 26A on the side of the conveyor insertion space S,
If the weight of the portion of the centrifugal trolley 10 on the side of the conveyor insertion space S is increased by, for example, increasing the weight of the centrifugal trolley 10, the weight of the two sides of the portal frame 20 can be balanced. When the vehicle travels (the same applies to tire traveling), the load on the wheels 25 arranged on both sides of the portal frame 20 is less likely to be biased. Thereby, it is possible to realize the smooth running of the centrifugal trolley 10 in which such one of the columns 26A and 26B is unevenly distributed.

[0036]

According to the present invention, one of the pillars is biased toward the center of the bogie to secure a space for inserting the conveyor in the space between the formwork on one side of the portal frame and the portal frame. With this configuration, a long transport conveyor can be inserted into the carriage without obstructing the passage function of the internal space of the portal frame. Moreover, since the portion arranged on the side of the conveyor insertion space of the form supporting portion has a higher strength structure than the portion opposite to the side of the conveyor inserting space, while maintaining the supporting strength of the form part sufficiently, Conveyor insertion space can be secured.

[Brief description of the drawings]

FIG. 1 is a front view of a trolley according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing the use of a tunnel excavation facility to which the centur truck according to one embodiment of the present invention is applied.

FIG. 3 is an enlarged perspective view of a steel foam constituting a part of a formwork part to be assembled to the centrifugal trolley according to one embodiment of the present invention.

FIG. 4 is an enlarged front view of a main part showing a mold part, a mold support part, and a connecting part structure according to one embodiment of the present invention.

[Description of Signs] 10 centimeter trolley, 13 belt conveyor (conveyor), 20 gate type frame part, 21 formwork part, 22 formwork support part, 26A, 26B support, S conveyor insertion space.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasufumi Miura 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. Inside Industrial Co., Ltd. (72) Inventor Shozo Fukuhara 345-1 Kanda, Nogata-shi, Fukuoka Towa Machine Electric Industries Co., Ltd. F-term (reference)

Claims (1)

[Claims] Claims: 1. A vehicle having a column arranged on a side of a vehicle,
A gate-shaped frame that runs in the tunnel after excavation, an arch-shaped frame that serves as a form for placing concrete on the excavated tunnel wall, and a gate-shaped frame A trolley provided with a form supporting portion that is supported on the outer periphery of the section, wherein one of the paired columns of the portal frame is unevenly distributed toward the center of the bogie, and the form section and the gate on one side of the bogie. In the space between the mold frame portion, a conveyor insertion space for inserting a conveyor for carrying out the slip generated during excavation is secured, and the mold support portion is disposed on the conveyor insertion space side. The center part has a stronger structure than the part on the opposite side of the conveyor insertion space side.