JPH1150514A - Method and device for laying box culvert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide box culvert laying techniques by which the period of construction work can be reduced through the enhancement of operational efficiency and excellent safety is ensured. SOLUTION: A method and a device for laying a box culvert include a first carrying truck 21 and a second carrying truck 22, which are capable of traveling along subgrade 20 on which the box culvert 19 is placed, and a portal crane 23 placed on the subgrade 20. A hoist 24 mounted on the portal crane 23 can hoist the first carrying truck 21 and the second carrying truck 22 above the subgrade 20 and return them to the subgrade 20. The operational efficiency for the work of laying the box culvert is thereby enhanced, the period of construction work can be enhanced, and safety is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laying technique suitable for laying a box culvert in a narrow place or under a bridge.

[0002]

2. Description of the Related Art When laying a box culvert used as an underdrain, etc. in a narrow place or under a bridge, conventionally, a roller such as a log is used, and the box culvert is placed on this, and the laying position is manually laid. It was rolled up and placed. However, such a laying method has a problem that not only the work efficiency is poor, but also there is a high risk that an operator will be caught between the box culvert and the roadbed when pulling out the roller at the laying position.

Accordingly, the present applicant has developed a box culvert laying technique suitable for construction in such a place, and disclosed in Japanese Utility Model Publication No. 1-182525, Japanese Patent Publication No. 2-35095, and Japanese Patent Application Laid-Open No. 9-60101. It is disclosed in gazettes and the like.

In the box culvert laying method disclosed in these publications, a box culvert is sequentially installed to a place where the box culvert is to be installed by using a carriage that runs on rails provided on both sides of a concrete subgrade on which the box culvert is mounted. Laying works while transporting.

By performing construction using such a box culvert laying method, workability can be greatly improved and worker safety can be ensured as compared with the conventional manual construction using rollers. it can.

[0006]

Problems to be Solved by the Invention
Gazette, Japanese Patent Publication No. Hei 2-35095, JP-A-9-60
In the case of the box culvert laying method disclosed in Japanese Patent Application Publication No. 101-101 and the like, the box culverts are sequentially laid by reciprocating a carrier along rails provided on both sides of a concrete subgrade. For this reason, during the laying work, one traveling trolley repeatedly moves back and forth between the place where the box culvert is loaded and the place where the box culvert is placed.

Therefore, when the transport trolley on which the box culvert is loaded is advancing toward the place where the box culvert is to be mounted, and when the transport trolley on which the box culvert is placed at a predetermined location becomes empty, the transport trolley on which the box culvert is loaded is placed on the box culvert loading location For example, when the vehicle is moving backward, the loading operation and the loading operation of the box culvert are interrupted, and the box culvert is put into a standby state, so that time is wasted and the construction period is delayed.

[0008] In the box culvert laying method disclosed in Japanese Utility Model Publication No. 1-11825 and the like, the rails provided on both sides of the concrete subgrade are so-called single tracks in a railway, so that a plurality of rails are transported on the rails. When the carts are arranged, the transport carts cannot be separated from each other. Therefore, it is extremely difficult to improve the working efficiency by arranging a plurality of transport carts on the rail.

Therefore, an object of the present invention is to provide a box culvert laying technique which can improve the working efficiency and shorten the construction period and is excellent in safety.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of transport vehicles that can travel along a roadbed on which a box culvert is mounted, and a transport vehicle arranged on a travel route of the transport vehicles. A method of laying a box culvert on a roadbed using a bogie lifting device, comprising: advancing a first carrier trolley loaded with a box culvert at a box culvert loading location to a box culvert loading scheduled place; After placing on the floor,
Retreat the transport vehicle to the location of the transport vehicle lifting device,
The first transport vehicle is lifted above the roadbed by the transport vehicle lifting device, and then the second transport vehicle loaded with the box culvert at the box culvert loading location is passed under the first transport vehicle to carry the box culvert. The box culvert is placed on the roadbed by moving forward to the place where the box is to be placed, and while the box culvert loaded on the second carriage is placed on the roadbed, the first carriage is lifted by the carriage lifting device. After returning to the roadbed and retreating toward the box culvert loading location, the second transport vehicle is retracted to the location of the transport vehicle lifting device, and the second transport vehicle is transported using the transport vehicle lifting device. , And then, at the box culvert loading place, the first transport trolley loaded with a new box culvert is moved toward the box culvert loading place Advances to, hereinafter, and repeating this process.

In the box culvert laying method according to the present invention, the transport vehicle is lifted by using the transport vehicle lifting device disposed on the traveling route, so that another transport vehicle can pass below the transport vehicle. (1) On a single roadbed, a transport vehicle loaded with a box culvert can be separated from an empty transport vehicle. Therefore, it is possible to perform the laying work by arranging a plurality of transport trolleys on the road floor, and the lifting work of the transport trolleys is performed between the box culvert loading place and the box culvert loading place. And do not hinder the mounting work. In addition, while one of the transport vehicles is moving, the loading and placing operations of the box culvert can be performed on the other transport vehicle, so that the standby time is reduced and the operation efficiency is improved.

On the other hand, the box culvert laying device of the present invention comprises a plurality of transport vehicles capable of traveling along a roadbed on which the box culvert is mounted, a box culvert loading device provided on the transport vehicle, and a traveling of the transport vehicle. And a transport trolley lifting device arranged on the path to lift the transport trolley. With such a configuration, it is possible to lay a box culvert while arranging a plurality of transport carts on the subgrade and alternately reciprocating them, and while the one transport cart is moving, loading the box culvert on the other transport cart. Since the work and the mounting work can be performed, the standby time is reduced, and the work efficiency is improved.

Further, in the box culvert laying device, a lifting platform capable of mounting and raising and lowering the box culvert can be provided as a box culvert loading device of the transport vehicle. By adopting such a configuration, if the box culvert is placed in a state where the lift is raised, the traveling of the transport trolley is not hindered, and if the lift is lowered at the box culvert placement scheduled place, the loaded box is Since the culvert can be placed on the subgrade, the laying work can be performed efficiently.

Further, in the box culvert laying device of the present invention, a movable crane can be provided as a carrier trolley lifting device. With such a configuration, the transport trolley can be smoothly lifted and lowered, and it is possible to promptly respond to the case where a change in the lifting point is required along with the progress of the laying work. .

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a configuration diagram showing a box culvert laying apparatus according to an embodiment, FIG. 2 is a perspective view of a box culvert transport trolley, FIG. 3 is a side view of the box culvert transport trolley shown in FIG. 2, and FIG. FIG.

As shown in FIG. 1, the box culvert laying apparatus of the present embodiment comprises a first transport vehicle 21 and a second transport vehicle 22 that can travel along a roadbed 20 on which a box culvert 19 is placed. And a portal crane 23 disposed on the floor 20. The lifting machine 24 mounted on the portal crane 23 lifts and holds the first transport vehicle 21 and the second transport vehicle 22 above the roadbed 20.
It can be returned to zero.

Here, with reference to FIGS. 2 and 3, the first transport vehicle 21 and the second transport vehicle 22 will be described. In addition, the 1st conveyance trolley 21 and the 2nd conveyance trolley 22 are provided with the same structure and function.

In the drawing, reference numeral 1 denotes a traveling bogie having a rectangular cross section, a hollow portion formed therein, and a wheel 2 rotatably mounted thereon.
Is a drive motor fixed to one end of the traveling vehicle 1 together with the speed reducer, and constitutes a drive system for rotatingly driving the wheel 2 from the speed reducer 4 via the chain 5. The drive of the traveling vehicle 1 is performed by remote control using a remote control switch (not shown) connected to the drive motor 3.

Reference numeral 6 denotes a hydraulic jack fixed in the hollow portion of the traveling vehicle 1. The operation of the hydraulic jack 6 is performed by the above-mentioned remote control switch. An electric hydraulic pump 8 that drives a hydraulic jack 6 is provided on a bridge 7 that connects the pair of traveling vehicles 1 and 1 at their base ends.

Reference numeral 9 denotes a lifting platform mounted on the traveling vehicle 1, which has a downwardly concave cross-sectional shape that covers the upper surface and both side surfaces of the traveling vehicle 1. The lift 9 is moved up and down by jacking up and jacking down the hydraulic jack 6.

Numeral 10 denotes a lateral feeder provided on one of the traveling carts 1, and a handle (not shown) is set on a handle mounting portion 10b provided below the slide base 10a, and the handle is manually rotated. Thereby, the slide base 10a can be moved in a direction perpendicular to the traveling direction. A roller 11 for moving the box culvert smoothly when the lateral feed device 10 is operated is provided on the other traveling vehicle 1 at a position corresponding to the lateral feed device 10.

As described above, in the box culvert laying apparatus of the present embodiment, since the transport trolleys 21 and 22 are provided with the lift pedestal 9 on which the box culvert 19 can be placed and raised, the lift pedestal 9 is raised. If the box culvert 19 is placed in a state where the box culvert 19 is placed, the traveling of the transport carts 21 and 22 is not hindered. If the elevator 9 is lowered at the place where the box culvert is to be placed, the loaded box culvert 19 is placed on the roadbed 20. Can be placed. Also, the traversing device 1
Since 0 is provided, position adjustment in the direction perpendicular to the traveling direction is also possible, and the box culvert 19 can be placed at an accurate position.

Further, as shown in FIG.
A portal crane 23 for lifting the elevator 22 is disposed so as to straddle the roadbed 20, and the lifting machine 24 is used for the empty first carrier 2.
The first and second transport vehicles 22 can be lifted and held above the roadbed 20, and can be returned to the roadbed 20. In addition,
Since the portal crane 23 is movable, the installation position can be changed.

Next, a method of actually laying a box culvert will be described with reference to FIG. FIG. 5 is a process explanatory view showing a box culvert laying method.

As shown in FIG. 5 (a), the first carriage 21 loaded with the box culvert 19a is moved forward to the box culvert loading place at the box culvert loading place, and as shown in FIG. The culvert 19a is placed on the subgrade 20. After that, the empty first transport vehicle 21 is retracted to the position where the portal crane 23 is disposed, and the first transport vehicle 21 is moved upward by the lifting machine 24 above the roadbed 20 as shown in FIG. lift.

On the other hand, as shown in FIGS.
At the box culvert loading location, the second transport trolley 22 loaded with the box culverts 19b is passed under the suspended first transport trolley 21 and advanced to the box culvert loading scheduled location, as shown in FIG. Then, the box culvert 19b is placed on the subgrade 20.

In the meantime, after the lifting machine 24 is operated in the descending direction to return the empty first carriage 21 to the roadbed 20, it is retracted toward the box culvert loading place and becomes empty. The second transport trolley 22 is retracted to a certain point of the portal crane 23, and when the second transport trolley 22 reaches the point, the second transport trolley 22 is moved to the subgrade 2 using a lifting machine 24.
Lift above zero.

Next, a new box culvert 19c is loaded on the first transport carriage 21 that has returned to the box culvert loading location, and is advanced again toward the box culvert loading scheduled location. Hereinafter, (a) to (e)
Box culvert 19c
Can be sequentially laid on the roadbed 20.

As described above, in the box culvert laying method of the present embodiment, the emptied carrier is lifted by using the portal crane 23 arranged so as to straddle the roadbed 20, thereby forming one roadbed 20. Above, the transport trolley loaded with the box culvert can be separated from the empty transport trolley.

Therefore, it is possible to perform the laying operation while alternately reciprocating between the first transport vehicle 21 and the second transport vehicle 22 disposed on the roadbed 20.
Since is located in the middle of the roadbed 20, the box culvert loading operation and the mounting operation are not hindered. In addition, while one of the transport vehicles is moving, the loading and placing operations of the box culvert can be performed on the other transport vehicle, so that the standby time is reduced and the operation efficiency is improved.

Further, in this embodiment, the portal crane 2
3 is movable, so that it is possible to promptly cope with a case where a change in the lifting point of the transport vehicle becomes necessary as the box culvert laying operation progresses. In addition to the portal crane 23, a crane having a structure in which a lifting machine 24 is attached to a horizontal holding member or the like disposed above the roadbed 20 may be used.

Next, the transport time when the above-mentioned apparatus is used is calculated. It should be noted that, here, loss time such as the unloading time of the box culvert, the installation time, and the hanging time during standby is not considered, but only the transport time.

First, the case where the box culvert is transported by using one carriage (prior art) will be described. Here, Δt: All box culvert conveyance (reciprocation)
(Min), L: Total construction extension (m), L
1: box culvert length (m), s: bogie speed (m)
/ Min), n: the number of box culverts (pieces), the total transport time is given by the following equation: Δt = 2 · L1 / s + 2 (2 · L1) / s + 2 (3 · L)
1) / s +... +2 (n · L1) / s =
n / 2 · {2 · L1 / s + (2n · L1) / s}.

On the other hand, when a box culvert is transported by using two carts, and a fixed lifting standby place is provided at an intermediate position of the construction extension, the following equation is obtained. In the following, the same symbols as those in the above formulas indicate the same contents. Σt = 2n · L1 / s + n · L1 · (n / 2-1) / s + 2 · L1 / s + ····· + 2 (n / 2) L1 / s = 2n · L1 / s + n · L1 · (n / 2-1) / s + n / 4 {2 · L1 / s + 2 (n / 2) · L1 / s} = n · L1 / 4s · (3n + 6)

Next, in the case where two carts are used and a movable lifting standby place is provided in the middle of the extension of the construction, the following formula is obtained. Σt = 3 · nL1 / 2s + L1 / s + 2 · L1 / s + 3 · L1 / s + ····· L1 / s · (n−1) = 3 · nL1 / 2s + (n−1) / 2 ／ L1 / s + L1 / s · (n−1)｝ = nL1 / 2s · (n + 2)

Based on the above calculation formula, the total construction extension: L =
Table 1 shows the results of calculation of the transport time with 100 m, box culvert length: L1 = 2.0 m, bogie speed s = 10 m / min, and required number of box culverts: n = 100/2 = 50.

[0037]

[Table 1]

[0038]

According to the present invention, the following effects can be obtained.

(1) According to the method for laying a box culvert according to the first aspect of the present invention, it is possible to separate a transport trolley loaded with box culverts and an empty transport trolley on one roadbed, so that a plurality of transport trolleys can be used. It is possible to perform the laying work while arranging and reciprocating alternately, and the lifting work of the transport trolley is performed in the middle of the box culvert loading place and the box culvert placing place, so the box culvert loading work and loading work can be done. There is no hindrance.
In addition, since the loading operation and the loading operation of the box culvert in the other transporting cart can be performed while the other transporting cart is moving, the working efficiency is improved by reducing the standby time,
The construction period can be shortened.

(2) A plurality of transport vehicles that can travel along the roadbed on which the box culverts are mounted, a box culvert loading device provided on the transport vehicles, and a vertical movement of the transport vehicles arranged on the traveling route of the transport vehicles. With the transport trolley lifting device, a plurality of transport trolleys can be placed on the roadbed and box culvert laying work can be performed while alternately reciprocating. Since the operation is performed in the middle of the box culvert mounting place, the loading operation and the mounting operation of the box culvert are not hindered. In addition, since the loading operation and the loading operation of the box culvert can be performed on the other transport vehicle while the other transport vehicle is moving, the standby time is reduced, and the operation efficiency is improved.

(3) As a box culvert loading device for the transport trolley, a box culvert can be placed on the elevator so that it can be moved up and down. If the box culvert is placed with the elevator being raised, the transport trolley runs. If the elevator is lowered at the place where the box culvert is to be placed, the loaded box culvert can be placed on the roadbed, so that the laying work can be performed efficiently.

(4) By providing a movable crane as a lifting device for the transport vehicle, the transport vehicle can be raised and lowered smoothly, and it is necessary to change the lifting point as the laying work progresses. Can respond quickly.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a box culvert laying device.

FIG. 2 is a perspective view showing a box culvert transfer cart.

FIG. 3 is a side view of the box culvert transfer cart shown in FIG. 2;

FIG. 4 is a front view showing a lifting operation by a portal crane.

FIG. 5 is a process explanatory view showing a box culvert laying method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling trolley 2 Wheel 3 Drive motor 4 Reduction gear 5 Chain 6 Hydraulic jack 7 Bridge 8 Hydraulic pump 9 Elevating platform 10 Lateral feed device 10a Slide base 10b Handle attaching part 11 Roller 19, 19a, 19b, 19c Box culvert 20 Roadbed 21 1st conveyance trolley 22 2nd conveyance trolley 23 Portal crane 24 Lifting machine

Claims (4)

[Claims] 1. The box culvert is transported along a roadbed on which a box culvert is mounted, and the box culvert is mounted on the roadbed by using a transporting vehicle lifting device disposed on a traveling path of the transporting vehicle. A box carrier is loaded at a box culvert loading location, a first transport trolley loaded with a box culvert is advanced to a box culvert loading location, the box culvert is placed on the roadbed, and then the first transport is carried out. The truck is retracted to the location of the transport trolley lifting device, the first transport trolley is lifted above the roadbed by the transport trolley lifting device, and then a box culvert is loaded at the box culvert loading location. A second transporting trolley is advanced under the first transporting trolley to a place where the box culvert is to be placed, The box culvert is placed on the roadbed, while the box culvert loaded on the second transport trolley is placed on the roadbed, the first transport trolley is moved by the transport trolley lifting device. After returning to the road floor and retreating toward the box culvert loading location, the second transport vehicle is retracted to the location of the transport vehicle lifting device, and the second transport vehicle is lifted using the transport vehicle lifting device. Lifting the transport trolley above the roadbed, and then advancing the first transport trolley loaded with a new box culvert at the box culvert loading location toward the box culvert loading scheduled location; A box culvert laying method characterized by repeating the above. 2. A plurality of transport vehicles that can travel along a roadbed on which a box culvert is mounted, a box culvert loading device provided on the transport vehicle, and the transport vehicle disposed on a travel route of the transport vehicle. Box culvert laying device provided with a transport trolley lifting device for raising and lowering the trolley. 3. The box culvert laying device according to claim 2, further comprising a lifting platform on which the box culvert can be placed and moved up and down as the box culvert loading device of the transport vehicle. 4. The box culvert laying device according to claim 2, wherein a movable crane is provided as the transport trolley lifting device.