JPH06288189A - Laying method for portal culvert - Google Patents

Abstract

PURPOSE:To lay a portal culvert in a narrow excavation space. CONSTITUTION:Support sections 4 for a portal culvert conveying device are provided on the inner face side of both side walls 3a of a portal culvert 3 arranged on foundation concrete 1 and opened downward, and lift devices of conveying devices A arranged below the support sections 4 are lifted to float the portal culvert 3. The conveying devices A are moved to convey the portal culvert 3 to the installation site, the lift devices of the conveying devices A are lowered at the installation site, and the portal culvert 3 is installed in sequence on the foundation concrete 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a portal culvert which can be suitably used especially in a narrow pit.

[0002]

2. Description of the Related Art The most common method for laying a precast portal culvert is to suspend it from above by using a crane or the like in an open-cut space. However, a large crane cannot be used in construction in a narrow place, and it is necessary to move the excavation space to the installation position by using a roller or the like.

The applicant of the present application has developed various transporting devices for the portal culvert used in such a case.
It was proposed in Japanese Utility Model Publication No. 59-18830 and Japanese Utility Model Publication No. 62-31186.

By using this transporting device, it is possible to use mechanical power in a narrow place instead of the conventional human-powered construction, and even a large portal culvert can be quickly and easily operated without much labor. Can be installed safely.

On the other hand, due to various factors such as recent densely packed houses, congestion of underground buried objects, and reduction of construction costs, the excavation space for laying portal culverts has become increasingly narrow. Absent. In extreme cases, the distance from the outer wall of the portal culvert to the earth retaining sheet pile is 1
The case of about 0 to 20 cm also occurs.

[0006]

However, according to the conventional laying method using the conveying device, a certain space is required between the side face of the portal culvert and the sheet pile as the installation place of the conveying device or the working space, and It becomes difficult to use in a narrow space.

The problem to be solved by the present invention is,
By effectively utilizing the transport device proposed in Japanese Patent No. 18830, Japanese Utility Model Laid-Open No. 62-31186, etc., it is possible to lay a portal culvert in a narrower excavation space.

[0008]

A method for laying a portal culvert according to the present invention is to provide a support portion for a portal culvert transporting device on the inner surface of both side walls of a portal culvert which is arranged on a foundation concrete and which is opened downward. The elevating device of the carrying device arranged below the support part is raised to levitate the portal culvert, and then the carrying device is moved to carry the portal culvert to the installation site, and the elevating device is installed at the installation site. And the portal culverts are sequentially installed by lowering the above to solve the above problem.

Here, the foundation on which the portal culvert is placed is formed in advance into a flat shape by concrete,
After laying the portal culvert, the bottom plate can be laid with concrete or mortar at a predetermined slope. It is also possible to integrally form a convex part with the inner width of the portal culvert cast at a predetermined slope on the upper surface of the foundation concrete, and after laying down the lower ends of both side walls of the portal culvert with concrete or mortar. Is.

[0010]

In the present invention, the portal culvert whose lower part is opened can be used and the portal culvert transporting device can be arranged on the inner surface side of the portal culvert. As a result, it is possible to lay the portal culvert without providing any space between the side wall of the portal culvert and the earth retaining sheet pile.

[0011]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
FIG. 2 is an enlarged view of a main part of FIG.

[0012] Reference numeral 1 is a concrete foundation, which is flatly formed by a cast-in-place work, and a rail 2 is laid on the concrete foundation 1. Further, a transport device A capable of traveling is arranged on the rail 2.

Reference numeral 3 denotes a portal culvert whose lower part is opened. Insert nuts 3b are provided on both side walls 3a, and engaging members 4 are mounted on the insert nuts 3b by high-strength bolts. The engaging member 4 is made of an angle member having an L-shaped cross section, and is welded with an appropriate number of reinforcing members 5. The bottom surface 6 of the engaging member is supported by the transfer device A.

As shown in FIGS. 2 and 3, the carrier device A has a rectangular cross section 7, a hollow portion 8 formed therein, and a traveling carriage 10 on which a wheel 9 is rotatably mounted.
Is a drive motor fixed to one end of the traveling vehicle 7 together with the speed reducer 11, and constitutes a drive system for rotationally driving the wheel 9 on one side from the speed reducer 11 via the chain 12. The driving of the traveling carriage 7 is performed by remote control using the remote control switch 13 connected to the drive motor 10.

Reference numeral 14 is a cylinder in which an actuator 15 fixed in the hollow portion 8 is vertically projected and retracted through an opening 16 provided in the traveling carriage 7, and the remote control switch 1
Operate using 3.

Reference numeral 17 denotes an elevating table mounted on the traveling carriage 7, which has a cross-sectional shape which is downwardly concave and covers the upper surface and both side surfaces of the traveling carriage. The lift table 17 moves up and down in the vertical direction by moving the actuator 15 forward and backward by the operation of the cylinder 14.

Reference numeral 18 denotes a lateral feeding device, which is composed of a support base 19 fixed to the lift table 17 and a slide base 20 sliding on the surface of the support base 19 in a direction orthogonal to the traveling direction of the traveling carriage 7. .

Next, with reference to FIGS. 1 and 4, a method of laying a portal culvert using the above-mentioned carrier A will be described.

First, the rail 2 is laid on the concrete foundation 2, and a pair of transporting devices A are arranged on the rail 2.

Next, the side wall 3a of the portal culvert 3
The engaging member 4 is attached to the insert nut 3b provided in the above by high strength bolt coupling. From this state, the cylinder 14 is actuated to extend the actuator 15 to raise the lifting platform 17, raise the portal culvert 3 from the surface of the concrete foundation 1, and further drive the drive motor 10 to move the traveling carriage 7 to move the portal. The culvert 3 is conveyed to a predetermined installation position.

Next, as shown in FIG. 4, by retracting the actuator 1 of the cylinder 14 at the installation position in the vicinity of the already installed portal culvert 3-1 part, the elevating table 17 is lowered and the portal culvert 3 is mounted. Place on one side of the concrete foundation. In this case, in order to align with the portal culvert 3-1 in the front row, the transverse feed device 18 performs lateral positioning.

Finally, a bottom plate B having a predetermined slope is formed between the side walls 3a of the portal culvert 3 by pouring concrete.

As described above, according to the laying method of this embodiment, the portal culvert 3 whose lower part is opened can be used and the portal culvert transport device A can be arranged on the inner surface side of the portal culvert 3. This enables the laying work of the portal culvert 3 without providing any space between the portal culvert side wall 3a and the earth retaining sheet pile, and the installation using the transfer device A in a narrow place where the excavation cross section is restricted. Is possible.

FIG. 6 is a sectional view showing still another embodiment,
In this embodiment, a convex portion 1a having an inner width of a portal culvert, which has been cast in a predetermined gradient in advance, is integrally formed on the upper part of the foundation concrete 1, and the conveying device A is arranged on the convex portion 1a. is doing.

The laying method in this embodiment is similar to the previous embodiment, but after laying the portal culvert 3, the bottom end portions of both side walls 3a of the portal culvert 3 are made of concrete or mortar 25 without placing the bottom plate B. Solidify by.

As a result, as compared with the previous embodiment, the work of placing the concrete on the bottom plate is not particularly required, and it is only necessary to place the concrete on the lower end portions 3 of the side walls 3a of the portal culvert, and the work labor after the laying can be saved.

[0027]

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

(1) Since there is nothing projecting outside from the side wall of the laid portal culvert, it is possible to carry out construction within a narrow excavation cross section that cannot be used by the conventional transfer device.

(2) In the conventional laying method, it was necessary to secure a space for the conveying device, and it was forced to place extra concrete. However, according to the method of the present invention, it is not necessary and economical. Therefore, it is possible to work in a narrow space.

[Brief description of drawings]

FIG. 1 is a front view showing an implementation status of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

3 is a front view of the transfer device shown in FIG. 1. FIG.

FIG. 4 is an explanatory diagram showing a transportation procedure of a portal culvert.

FIG. 5 is an explanatory diagram showing a transportation procedure of a portal culvert.

FIG. 6 is an explanatory diagram showing a transportation procedure of the portal culvert in the second embodiment.

FIG. 7 is an explanatory diagram showing a transportation procedure of the portal culvert in the second embodiment.

[Explanation of symbols]

1 concrete foundation, 1a convex part, 2 rails, 3
Portal culvert, 3a Side wall, 3b Insert nut, 4 Engaging member, 5 Reinforcing material, 6 Bottom surface of engaging member, 7 Traveling carriage, 8 Hollow part, 9 Wheel, 10
Drive motor, 11 speed reducer, 12 chain, 13 remote control switch, 14 cylinder, 15 actuator, 16 opening, 17 lift, 18 traverse device, 19 support base, 20 slide base, A transfer device, B bottom plate

Claims (3)

[Claims] 1. A support portion for a portal culvert transporting device is provided on the inner surface side of both side walls of a portal culvert placed on a foundation concrete and opened downward, and a lifting device for the transporting device is disposed below the support portion. Raise to raise the portal culvert, then move the transport device to transport the portal culvert to the installation site, and lower the elevator device of the transport device at the installation site to place it on the foundation concrete. A method for laying portal culverts, characterized in that the portal culverts are sequentially installed. 2. After laying the portal culvert,
The method for laying a portal culvert according to claim 1, wherein a bottom plate having a predetermined slope is placed. 3. A base plate for a portal culvert having a predetermined slope is formed in advance on the upper surface of the foundation concrete, the portal culvert is laid, and then the side wall lower end of the portal culvert is consolidated. The method for laying a portal culvert according to claim 1.