JP3380806B2 - Opening / closing tool for lid of buried box and method for opening / closing lid using this opening / closing tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing tool for opening and closing a heavy lid exposed on the ground surface of a buried box such as a CCBOX which is provided in the ground and through which a plurality of communication cables and the like are inserted. The present invention relates to a method for opening and closing a lid using a tool.

[0002]

2. Description of the Related Art Conventionally, communication cables and various cables for supplying electric power are buried in the ground. At the branch connection point of these cables, the so-called CC
The cable is branched and connected using an embedded box such as a BOX. In these buried boxes, the boxes themselves are underground, but the lids are provided on the road surface.

[0003]

However, these buried boxes have the power cables and the like, which are one of the social infrastructures, inserted therein as described above, and because they are on the road surface, in terms of strength, It is made of heavy steel or concrete, and therefore cannot be opened and closed easily. Therefore, when this lid is opened for various works and maintenance at a later date, a truck crane or the like is used.

In view of this, the present invention does not use a truck crane or the like, requires only a few manpower, and requires the least effort,
Moreover, the object of the present invention is to solve the problems described above by providing a lid opening / closing tool that can be used safely in various buried boxes and a lid opening / closing method using the opening / closing tool.

[0005]

According to a first aspect of the invention, a hydraulic jack is installed in a vertical direction in a vertically elongated frame-shaped tool main body, and the hydraulic jack can be moved up and down in front of the tool main body. A vertical plate-shaped locking portion is provided, a concave portion is provided at the upper end edge of the locking portion, a protruding portion that is rolled up is provided at the lower end edge, and wheels for traveling the tool body are provided on the left and right sides of the tool body. , A lid support portion is provided at a substantially central portion of a substantially rectangular tubular support arm that is provided separately from the main body and has a step portion that is long in the horizontal direction and is bent upward in the middle, and the step portion of the support arm is provided. A vertical plate-shaped upper end edge and a lower end edge are provided at the end portion on which the provided portion is provided, and a hooked portion is provided at the upper end edge, and a locked portion that is detachably locked to the locking portion of the tool body is provided. , On the lid support part of the support arm, on the lid exposed in the ground surface of the buried box provided in the ground The upper end of the mounting rod whose lower end is locked in the hole or groove formed in the above, the support arm is fixed to the lid, and the locked portion of the support arm protruding outside the lid is The tool body is moved horizontally so that the locking portion of the tool body abuts, the hydraulic jack of the tool body is operated to raise the locking portion, and the locked portion is scooped from below to engage. The claw of the stopper is engaged with the recess of the engaging portion, and the lower end edge of the engaged portion is engaged with the protrusion of the engaging portion to integrally attach the engaged portion and the engaging portion. The lid body supported by the support arm was pulled up by the action, and it was used as an opening / closing tool for the lid body of the movable burying box.

According to a second aspect of the present invention, a hydraulic jack is installed in a vertical direction in a vertically elongated frame-shaped tool main body, and a vertical plate-like lock that can be lifted and lowered by the hydraulic jack is provided in front of the tool main body. Provided with a concave portion at the upper end edge of the locking portion, a protruding portion wound up upward at the lower end edge, and wheels for running the tool main body on the left and right sides of the tool main body, separately from the main body. A lid support portion is provided at a substantially central portion of a substantially rectangular tube-shaped support arm having a step portion that is long in the horizontal direction and bent upward in the middle, and screws are provided on the upper surface and the lower surface of the step portion of the support arm, respectively. Removable to the locking part of the tool body, which has a hole and has a vertical plate-like upper end edge and a lower end edge at the end of the supporting arm on which the step portion is provided, and which has a claw at the upper end edge. A locked portion that is locked to the Support the upper part of the mounting rod whose lower end is locked in the hole or groove formed in the upper surface of the lid body exposed on the ground surface of the scraped buried box, and fix the support arm to the lid body. The edge cutting bolt is screwed into the screw hole on the upper surface of the part, the lower end of the bolt is pulled out from the screw hole on the lower surface and supported on the ground to cut the edge of the lid body and the surrounding frame body, and the support protruding to the outside of the lid body The tool main body is moved horizontally with respect to the locked portion of the arm to bring the locking portion of the tool body into contact with the arm, and the hydraulic jack of the tool main body is activated to raise the locking portion to lock the locked portion. Scoop the part from below and engage the claw of the locked part with the recess of the locking part and the lower edge of the locked part with the protrusion of the locking part to lock the locked part. Part is attached integrally, and the lid supported by the support arm is pulled up by the action of the hydraulic jack to make it movable. And the opening and closing tool of the lid of the box.

According to a third aspect of the present invention, in opening and closing a heavy lid body exposed to the ground surface of a buried box provided in the ground, the left side and the right side of the upper surface of the lid body in a closed state, respectively. Is supported by a support arm having a substantially rectangular tube shape that is long in the horizontal direction from the left and right above the lid, and has a step portion that is bent upward in the middle, and the left and right end portions of the lid are supported. In the vicinity of the outer side of the tool arm, the tool body is moved horizontally with respect to the vertical plate-shaped locked portion provided at the end on the side where the stepped portion of the support arm is provided, and the locking portion of the tool body abuts. Then, the hydraulic jacks in the tool bodies raise the respective locking portions provided to be able to move up and down to scoop up the locked portions from below, and the claws of the locked portions are locked in the concave portions of the locking portions. The lower end edge of the locking portion is engaged with the projecting portion of the locking portion to integrally attach the locked portion and the locking portion, respectively. Lift simultaneously the lid from the left and right by a hydraulic jack, and the opening and closing process of the lid body buried box for moving the lid by the traveling device provided to each tool body.

According to a fourth aspect of the present invention, in opening and closing a heavy lid body exposed on the ground surface of a buried box provided in the ground, the left side and the right side of the upper surface of the lid body in a closed state, respectively. Has a step portion that is long in the horizontal direction from each of the left and right above the lid body, and has a step portion that is bent upward in the middle, and the step portion has a substantially rectangular tube shape with screw holes on the upper surface and the lower surface, respectively. Supported by the support arm of the support arm, and an edge cutting bolt is screwed into the screw hole on the upper surface of each step of the support arm to extend from the screw hole on the lower surface and supported on the ground to cut the edge of the lid body and the surrounding frame body. In the vicinity of the outside of each of the left and right end portions of the lid body, place the tool body horizontally with respect to the vertical plate-like locked portions provided at the end portions on the side where the step portions of these support arms are provided. It is moved and brought into contact with the locking part of the tool body, and it can be raised and lowered by the hydraulic jack inside each tool body. Each locking part is raised to scoop up the locked part from below, the claw of the locked part is the recess of the locking part, and the lower edge of the locked part is the protrusion of the locking part. Engage and attach the locked part and the locking part together, lift the lids simultaneously from the left and right sides by these hydraulic jacks, and move the lids by the traveling device provided in each tool body. The method for opening and closing the lid of the buried box was used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. The opening / closing tool for the lid of the buried box according to this embodiment includes a tool body A shown in FIG. 1 and a support arm B shown in FIG. The tool body A includes a rectangular parallelepiped frame 1 and wheel portions 2 provided on the left and right side surfaces. Inside the tool body A, a 2t hydraulic jack 3 is installed in the vertical direction on a bottom plate 4, and the maximum stroke for moving up and down of the hydraulic jack 3 is 250mm. An operating lever (not shown) of the hydraulic jack 3 is removable, and as shown in FIG. 3, a mounting port 3a is provided on the back side of the tool body A. A handle 5 for carrying the tool body A is provided on the head of the hydraulic jack 3.

A large opening surface is provided in the vertical direction on the front surface of the tool main body A, which is fixed to the elevating part of the hydraulic jack 3 and is a vertical plate-like engaging part which moves together with the elevating of the hydraulic jack 3. There are 6 hoistways. The vertical plate-shaped locking portion 6 is further fixed to the hydraulic jack 3 via a substantially square guide frame body 7. The guide frame body 7 is provided on each of the left and right side plates forming the front surface of the tool body A. The left and right ends of the end portion 8 are slidably locked to the edge portion 8, so that the locking portion 6 can be raised and lowered with respect to the tool body A. The locking portion 6 is a vertical plate shape, but is substantially H-shaped, and the recessed portion 6a in the upper portion is a portion for locking a claw 9a in the upper portion of a locked portion 9 of the support arm B described later. The lower two projecting portions 6b are wound up by 180 degrees so as to lock the lower end edge 9b of the locked portion 9.

Each of the left and right wheel portions 2 of the tool body A is provided with a protruding piece 10 in the horizontal direction, and casters are provided on the lower surfaces of the protruding pieces 10 one by one. Although it can be fixed and rotated freely by the stopper 11c, this caster has a fixed traveling direction and can travel only in the left-right direction (hereinafter referred to as "fixed caster 11a"), while the caster on the right side is Although it does not have a stopper 11c, the traveling direction is not fixed, and the fixing release lever 11
It is rotatable 360 degrees on the plane by d (hereinafter referred to as "universal caster 11b").

As shown in FIGS. 2 and 4, the support arm B has a substantially rectangular tube shape having a step portion 12 which is long in the horizontal direction and is bent upward in the middle, and the step portion 12 of the support arm B is provided. A vertical plate-shaped locked portion 9 that is locked to the locking portion 6 of the tool body A is fixed to the end portion on the open side. This locked portion 9
Has a concave portion at the center of the upper edge, and a short angle piece is fixed to the portion to form a claw 9a. Further, on the upper surface and the lower surface of the central portion of the support arm B, there are long holes 1 which are constant in the longitudinal direction.
3 (a long hole on the lower surface is not shown) is drilled into each of these two long holes 13, and a mounting bolt 14 screwed to the surface of the iron lid.
Of the special washer 15 and the nut 1 on the portion protruding from the upper surface of the support arm B.
5a is covered and tightened with a spanner to support and fix the support arm B to the iron lid. Furthermore, step 1
The upper and lower surfaces of 2 are provided with screw holes 17 for mounting the edge cutting bolts 16 of the iron lid.

Next, the procedure for opening the iron lid of the buried box using this opening / closing tool will be described with reference to FIGS.
As shown in FIG. 5, caps (not shown) that close the lock device opening / closing holes 19 provided on the left side and the right side on the upper surface of the iron lid 18 of the closed buried box provided on the road. (Only the right side is shown in FIG. 5, and the same applies to FIGS. 6 to 8, 10, and 12 below).
Unlock 8 The mounting bolts 14 are respectively screwed into the lock device opening / closing holes 19 and are screwed in until a thick threaded portion (not shown) of the mounting bolt 14 is hidden by a monkey wrench (in the direction of the arrow in FIG. 5). The exposed end of 14 is left untouched.

As shown in FIG. 6, each support arm B is inserted through the elongated holes 13 at the ends of the two mounting bolts 14 protruding from the surface of the iron lid 18. At this time, the stepped portion 12 of the support arm B, into which the mounting bolt 14 is inserted, is located above the ground adjacent to the left and right of the iron lid 18.
The position of the mounting bolt 14 in the long hole 13 is adjusted.
After that, the special washer 15 and the nut 15a are put on the portion projecting from the upper surface of each support arm B, and it is confirmed that the lower surface of the support arm B is in a positional relationship (see FIG. 11) at right angles to the edge of the iron lid 18. After that, the special washer 15 and nut 15
Tighten a with a spanner (in the direction of the arrow in FIG. 6) to securely fix the support arm B to the iron lid 18 to support it.

Then, the edge of the iron lid 18 with the surrounding frame is cut. Usually, in a buried box that has been installed for a long time, sand, pebbles, mud, etc., get stuck in the gap between the lid and the surrounding frame of the buried box, and these become stuck, and the Sometimes you can't even try to lift the lid.
Therefore, edging is performed to separate these fixed parts.

As shown in FIG. 7, the edging bolt 16 is screwed from the upper surface to the screw hole 17 provided on the stepped portion 12 of each of the left and right support arms B supporting the iron lid 18 and projected from the lower surface. The edge of the edging bolt 16 supports the ground adjacent to the iron lid 18, and the screwing is further advanced on both the left and right sides.
By lifting the support arm B, the edge of the iron lid 18 is cut. At this time, a backing plate 20 is laid in order to protect the pavement and the like around the iron lid 18. After the edging of the iron lid 18 is completed, the screwing of the edging bolt 16 is loosened so that the two edging bolts 16 are respectively supported by the support arm B.
Then, the iron lid 18 is lowered and returned to its original position. Further, the pad 20 is removed.

Next, as shown in FIG. 8, the tool main body A is placed on a long guide rail 21 having both edges raised at a constant width, and in this state, one end of the guide rail 21 is raised. The edge cutouts 21a are installed on the left and right adjacent grounds of the iron lid 18 so that the locked portions 9 of the support arm B are located at the positions. Then, the tool body A is brought closer to the cutout portion 21a, and the engaging portion 6 of the tool body A is moved to the support arm B.
Match with the locked portion 9 of. At this time, fixed caster 11
The brake is applied by the stopper 11c of a and the rotation of the free caster 11b on the plane is fixed. After that, as shown in FIG. 9, it is confirmed that the two lower protruding portions 6b of the locking portion 6 are located at a position lower than the lower end edge 9b of the locked portion 9.

Thereafter, as shown in FIG. 10, the tool body A
The hydraulic jack 3 is operated to lift up (in the direction of the arrow in FIG. 10), and the locked portion 6 is rescued by the locked portion 6 and the locked portion 9 of the support arm B and the locking portion 6 of the tool body A. Lock each other. At this time, the lower end edge 9b of the locked portion 9 is locked to the projecting portions 6a on both sides of the locking portion 6, and the recess 6 of the locking portion 6 is also locked.
The claw 9a of the locked portion 9 is locked to a. In this state, the iron lid 18 supported by the support arm B is lifted up. At this time, the hydraulic jack 3 for lifting up the iron lid 18 is operated at the same speed on the left and right.

When the iron lid 18 is sufficiently lifted from the ground by lifting up the hydraulic jacks 3 on both the left and right sides, as shown in FIG.
Release the brake by the stopper 11c of FIG.
As shown in, the handle 5 of each tool body A is held and the iron cover 18 is moved in parallel on the guide rail 21 to a predetermined position (arrow direction in FIG. 12). At this time, the rotation of the free caster 11b on the plane is fixed until it passes through the opening 18a of the buried box.

This embodiment has been described by opening and closing the iron lid 18. However, the lid is not limited to the iron lid 18, and any other lid body provided with the lock device opening / closing hole 19 may be made of concrete. It may be made of material. Further, although two opening / closing tools are used on the left and right, a plurality of sets of opening / closing tools may be used on the left and right if the iron lid to be opened and closed is long. When closing the iron lid 18, the work may be performed in the reverse order of the opening.

The mounting bolt 14 screwed into and screwed into the lock device opening / closing hole 19 of the iron lid 18 is not limited to such a threaded bolt, but a bent tip portion or a tip portion may be omitted. Various attachment rods such as a hook type that is projected in a T shape can be used.

In the above-described embodiment, the support arm B has a substantially rectangular tube shape which is long in the horizontal direction and has the step portion 12 which is bent upward in the middle. However, the present invention is not limited to this. Further, although the mounting bolt 14, the special washer 15, and the nut 15a are used as the lid supporting portion of the supporting arm B,
The lid support portion of the support arm B is not limited to these. Although the fixed casters 11a and the free casters 11b are used as wheels provided on the protruding piece 10 of the tool body A and as a traveling device of the tool body A, the present invention is not limited to these.

Further, in the edging operation, the pad plate 20 is laid to protect the pavement around the iron lid 18 and the tip of the edging bolt 16 is supported. It is not an essential requirement of this invention. Further, each tool body A with the iron lid 18 lifted up is moved on the guide rail 21, but moving each tool body A on the guide rail 21 is not an essential requirement of the present invention.

[0024]

In each of the first to fourth aspects of the invention, the opening and closing tools of these inventions can be used independently for opening and closing the heavy lid of the buried box, and the support arm and the tool body are separated. Therefore, it is possible to easily and surely attach the lower surface of the support arm in a positional relationship at a right angle to the upper surface of the lid, which is the opening / closing preparation work. Therefore, it is not necessary to use a truck crane or the like. Also, fix these left and right support arms directly to the lid, and move the tool body horizontally with respect to the locked parts of these support arms to bring the locking parts of the tool body into contact, The jack is operated to raise the locking part to scoop up the locked part from below, the claw of the locked part is the recess of the locking part, and the lower edge of the locked part is the locking part. Since the protruding portions are engaged with each other, the locked portion and the locking portion can be reliably and stably attached integrally. In this way, the locked parts of each support arm are scooped up by the hydraulic jacks of the left and right tool bodies that can be lifted up and down, and the left and right opening and closing tools and the lid are integrated, so that the lid itself The beam is used as an opening / closing tool to reduce the size of the tool. Therefore, even when the lid body supported by the support arm is pulled up by the action of the hydraulic jack, the work can be performed extremely safely. Furthermore, it is lightweight and easy to handle in transportation and transportation, and can be used in various ways even if the lid that opens and closes is long and wide. Further, since it is lifted right above by the hydraulic jack, even a thick lid can be easily opened and closed.

Further, in the inventions of claims 2 and 4, the lid can be lifted with a small force by the thrust of the screw and the lever action, and the edge of the lid fixed to the periphery can be cut off. You can open and close your body very smoothly.

[Brief description of drawings]

FIG. 1 is a perspective view of a tool body according to an embodiment of the present invention.

FIG. 2 is a perspective view of a support arm according to an embodiment of the present invention.

FIG. 3 is a rear view of the opening / closing tool according to the embodiment of the present invention.

FIG. 4 is a plan view of the opening / closing tool according to the embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which mounting bolts are screwed into the lock device opening / closing holes of the lid in the embodiment of the present invention.

FIG. 6 is an explanatory view showing a state in which the support arm is fixed to the lid body through mounting bolts screwed into the lock device opening / closing holes of the lid body in the embodiment of the present invention.

FIG. 7 is an explanatory view showing a state in which the edge of the lid is cut by screwing the edge cutting bolt in the support arm fixed to the lid of the embodiment of the present invention.

FIG. 8 is an explanatory view of locking and fixing the support arm fixed to the lid to the tool body in the embodiment of the present invention.

FIG. 9 is an explanatory view showing a state in which the locked portion of the support arm and the locking portion of the tool body are locked and fixed together in the embodiment of the present invention.

FIG. 10 is an explanatory view showing a state in which the lid body is lifted up by the tool main body in which the support arm is locked and fixed in the embodiment of the present invention.

FIG. 11 is a side view showing a state where the lid body is lifted up from the left and right by two opening / closing tools in the embodiment of the present invention.

FIG. 12 is an explanatory view showing a state in which the lid body lifted up is moved by the opening / closing tool in the embodiment of the present invention.

[Explanation of symbols]

A Tool body B Support arm 2 Wheel part 3 Hydraulic jack 6 Locking part 9 Locked part 11a of support arm Fixed caster 11b Universal caster 12 Step part of support arm 13 Long hole of support arm 14 Mounting bolt 16 Bolt for edge cutting 18 Lid

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koji Matsumoto 5-38-3 Minami-cho, Fuchu-shi, Tokyo Within Koken Sangyo Co., Ltd. (72) Inventor Hiroshi Onozawa 1-1-14 Shinjuku-ku, Tokyo Nasu Electric Co., Ltd. Within Iron Works Co., Ltd. (56) Reference JP-A-9-111792 (JP, A) Actual development 4-37639 (JP, U) Actual development 7-17842 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) H02G 1/06 E02D 29/14 E02D 29/12 H02G 9/04

Claims (4)

(57) [Claims] Claims: 1. A hydraulic jack is installed in a vertical direction in a vertically elongated frame-shaped tool body, and a vertical plate-shaped engaging portion that can be raised and lowered by the hydraulic jack is provided in front of the tool body. A recess is provided at the upper edge of the engaging portion, a protruding portion is wound up at the lower edge, and wheels for traveling the tool body are provided on the left and right sides of the tool body. The support body is provided at the substantially central portion of a substantially rectangular tube-shaped support arm having a step portion that is long and bent upward in the middle, and a vertical plate shape is provided at the end portion of the support arm on the side where the step portion is provided. An engaged portion that has an upper end edge and a lower end edge and is provided with a claw on the upper end edge and is detachably engaged with the engaging portion of the tool body is provided. Lock the lower end of the buried box provided in the ground into the hole or groove that was drilled in the upper surface of the lid exposed on the ground surface. The upper part of the mounting rod is supported, the supporting arm is fixed to the lid, and the tool main body is moved horizontally with respect to the locked portion of the supporting arm projecting outward of the lid to engage the tool main body. The stopper is brought into contact, the hydraulic jack of the tool body is operated to raise the locking part, and the locked part is scooped up from below, and the claw of the locked part is recessed in the locking part, The lower end edge of the locked portion is engaged with the protruding portion of the locking portion to integrally attach the locked portion and the locking portion, and the lid body supported by the support arm by the action of the hydraulic jack is attached. A tool for opening and closing the lid of a buried box, which can be raised and moved freely. 2. A hydraulic jack is installed in a vertical direction in a vertically elongated frame-shaped tool body, and a vertical plate-shaped engaging portion that can be raised and lowered by the hydraulic jack is provided on the front surface of the tool body. A recess is provided at the upper edge of the engaging portion, a protruding portion is wound up at the lower edge, and wheels for traveling the tool body are provided on the left and right sides of the tool body. Is provided at a substantially central portion of a substantially rectangular tube-shaped support arm having a step portion that is long and bent upward in the middle, and a screw hole is bored on each of the upper surface and the lower surface of the step portion of the support arm. The support arm is detachably engaged with the engaging portion of the tool body, which has a vertical plate-like upper end edge and a lower end edge at the end portion on the side where the step portion is provided, and has a claw provided at the upper end edge. An embedded box that is provided in the ground with a locked portion and the lid support portion of the support arm. , A hole drilled in the upper surface of the lid exposed on the ground surface or the upper part of the mounting rod whose lower end is locked in a groove, and the supporting arm is fixed to the lid, and a screw hole is formed in the upper surface of the stepped portion. From above, the lower edge of the support arm is screwed out, the lower end of it is pulled out from the screw hole on the lower surface, and it is supported on the ground to cut the edge of the lid and the surrounding frame, and the support arm protruding outside the lid is locked. Move the tool body horizontally with respect to the part to bring the locking part of the tool body into contact with it, operate the hydraulic jack of the tool body to raise the locking part, and scoop up the locked part from below. Then, the claw of the locked portion is engaged with the concave portion of the locking portion, and the lower end edge of the locked portion is engaged with the protruding portion of the locking portion, so that the locked portion and the locking portion are integrally attached, The lid supported by the support arm is pulled up by the action of the hydraulic jack, and is movable. Opening and closing tool of the lid of 設箱. 3. In the opening and closing of a heavy lid body exposed to the ground surface of a buried box provided in the ground, the left and right surfaces on the upper surface of the lid body in the closed state are From the left and right above the lid body, supported by a substantially rectangular tubular support arm that is long in the horizontal direction and has a step portion that is bent upward in the middle, in the vicinity of the outside of each of the left and right end portions of the lid body. The tool body is moved horizontally with respect to the vertical plate-shaped locked portion provided at the end portion on the side where the step portion of the support arm is provided, and the locking portion of the tool body is brought into contact with each tool body. The respective hydraulic jacks inside raise the lockable parts that are lifted to scoop up the locked parts from below, so that the claws of the locked parts are recessed in the locking parts.
Engage the lower edge of the locked part with the protruding part of the locking part to attach the locked part and the locking part together, and lift the lid from the left side and the right side at the same time by these hydraulic jacks. A method for opening and closing the lid of an embedded box, comprising moving the lid by a traveling device provided in each of the tool bodies. 4. When opening and closing a heavy lid body exposed on the ground surface of a buried box provided in the ground, the left and right surfaces on the upper surface of the lid body in the closed state are From the left and right above the lid body, there is a step portion that is long in the horizontal direction and bent upward in the middle, and the step portion is supported by a substantially rectangular tubular support arm with screw holes on the upper surface and the lower surface, respectively. Then, an edge cutting bolt is screwed into the screw hole on the upper surface of each step of the support arm to be pulled out from the screw hole on the lower surface and supported on the ground to cut the edge of the lid body and the surrounding frame body, In the vicinity of the outside of each left and right end of the body, the tool main body is moved horizontally with respect to the vertical plate-shaped locked portion provided at the end on the side where the step of these support arms is provided. Abut the locking part of the tool, and lift up each locking part that can be raised and lowered by the hydraulic jack in each tool body. And scooped from below the engaged portion by the claw of the engaging portion in the recess of the locking portion,
Engage the lower edge of the locked part with the protruding part of the locking part to attach the locked part and the locking part together, and lift the lid from the left side and the right side at the same time by these hydraulic jacks. A method for opening and closing the lid of an embedded box, comprising moving the lid by a traveling device provided in each of the tool bodies.