JPH0491616A - Pit cover receiving frame and joint metal therefor, and installation of receiving frame - Google Patents

Abstract

PURPOSE:To simplify temporary securing work prior to placement of concrete by forming a step for mounting a pit cover in a frame body and forming a securing seat having a slit to be inserted with a rotation stopper of a supporting member below the mounting step while leaving a hollow section with respect to the mounting step. CONSTITUTION:Primary concrete 32 is placed at a position lower than the bottom face of a pit P. At that time, anchor members B such as iron rods are planted, at predetermined intervals, at positions corresponding to the side positions of the pit P in the primary concrete. A supporting member 2 temporarily fastened to a frame body 1A is then welded to the anchor member B thus temporarily securing the frame body 1A to a predetermined horizontal position at set height. The frame body 1A and the supporting member 2 are then fastened and the supporting member 2 is secured firmly to the anchor member B. Subsequently, secondary concrete 34A is placed, a receiving frame member 1 is buried and secured by mortar 31a, 31b and then the pit P and the floor face are finished.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a receiving frame material for a pit lid and a connecting tool for this receiving frame material, for forming a pit for cable wiring, a groove for a train, etc. In addition, regarding the construction method of the receiving frame material, in detail, a receiving frame material for a bit lid that can be easily temporarily fixed,
The present invention also relates to a connection tool for receiving frame materials that can connect the receiving frame materials with a simple operation, and a method for constructing the receiving frame materials that can easily embed and fix the receiving frame materials in concrete.

[Prior Art] When forming a pit for cable wiring, etc. outdoors or indoors, it is common to form a receiving frame material along the upper edge of the pit to support the bit cover. . FIG. 9 is a perspective explanatory view showing an example of the arrangement of the pit P and the receiving frame material 1. As shown in FIG. The pit P is formed by pouring concrete at a position dug below the floor surface GL. Receiving frame members 1.1 supporting both side edges of the pit lid 4 are arranged in parallel on the upper edges of both sides of the pit P. FIG. 10 is a sectional view showing an example of the receiving frame material 1. The receiving frame material 1 consists of an L-shaped steel angle 51 and a steel bar 52 with a rectangular cross section welded to the upper surface of the L-shaped angle 51. The pit lid 4 is supported on the upper surface of the angle 51, and the steel bar 52 restricts the movement of the side surface of the pit M4.
4 so that the top surface is the same as the floor level GL.

When connecting these receiving frame members 1 in the longitudinal direction, or when connecting the receiving frame members 1.1 to each other at a bent portion, the ends of the receiving frame members 1 are butt welded to form a joint. It is assumed that Wd is formed.

By the way, when installing the receiving frame material 1, first, primary concrete 32 is poured leaving a space of a size and shape corresponding to the pit P. At this time, anchor reinforcements 53 are provided protruding from the primary concrete 32.

Next, while holding the receiving frame member 1 at a predetermined height and horizontal position, it is welded and fixed to the insert 53. Thus 1
Next, the receiving frame material 1 is temporarily fixed to the concrete 32, and then secondary concrete 34 is cast, and the receiving frame material 1 is buried and fixed in the secondary concrete. Finally, mortar material 31a
, 31b to finish the inner surface of the pit and the floor surface.

However, when temporarily fixing the receiving frame material 1 using the anchor rods 53, complicated cutting and welding operations had to be performed. In other words, it is rare that the cutting line 53 is provided at an accurate position and at an appropriate length.
In actual construction methods, it is often necessary to cut the crossbars and receiving frame material in the vertical or horizontal direction for adjustment, or to additionally install auxiliary iron bars. It was extremely difficult to perform this cutting and welding work while positioning the parts.

Further, the welding work of the joint Wd between the receiving frame members is also complicated and requires a long time to perform the connection work.

[Problems to be Solved by the Invention] Therefore, the first object of the present invention is to provide a receiving frame material for a pit lid that can be easily temporarily fixed before concrete pouring, and to provide a receiving frame material for a pit lid that can be temporarily fixed before concrete placement. The goal is to perfect a construction method using

Still another object of the present invention is to provide a connecting tool that allows the above-mentioned receiving frame members to be easily connected to each other at a bending connection portion or a longitudinal connection portion.

[Means for Solving the Problems] A receiving frame material for a bit lid according to the present invention that achieves the above object is composed of a frame made of synthetic resin and a support member, and the frame body supports the pit lid. A receiving step is formed on which the support member is placed, and a fixing seat portion is provided below the receiving step with an insertion slit for a rotation stopper of the support member, leaving a cavity between the supporting member and the supporting member. The support member is provided with the rotation stopper and the fastening washer on the holding bolt.

The connecting tool of the present invention is also characterized in that it comprises a spacer plate that spans the cavity of each frame to be connected, a rotation stopper, and a fastening bolt that is threaded through the rotation stopper. .

Further, in the construction method of the present invention, the receiving frame material of the pit lid is fixed to an anchor material or a reinforcing material using a support member, and then concrete is poured.

[Operations and Examples] FIG. 1 is a partially cutaway perspective view showing a typical example of the receiving frame material for a pit lid according to the present invention, and the receiving frame material 1 is composed of a frame body IA and a supporting member 2. Consisted of. The frame IA is formed by integrally molding an upper wall 11 and a lower end wall 17 on a main body 12 having a C-shaped cross section, and has an insertion slit 1.
5 is formed to open downward, and a cavity 16 is formed in the upper part thereof. The main body portion 12 and the upper wall 11 allow the frame I
A receiving step 13 is formed along the longitudinal direction of A, and the pit M4 is placed on the receiving step 13 (see FIG. 2).

Therefore, it is preferable that the height of the upper wall 11 projecting from the main body 12 is equal to the thickness of the pit lid 4. Further, below the cavity 16, on both sides of the insertion slit 15, there are seat portions 1.
4a14b extends along the longitudinal direction of the frame IA.

In addition, a lower end wall 1 is provided at the bottom of the main body 12 on the inner wall side of the pit.
7 is preferably provided so as to protrude downward, so that the formwork can be easily installed when pouring concrete into the inner wall surface of the pit.

Furthermore, it is desirable that protrusions 18, 18 are provided on the outer surfaces of the main body 12 and the upper wall 11 so as to extend along the longitudinal direction of the frame IA. This prevents a gap from being formed between the body portion 12 and the like.

The other supporting member 2 is a plate-shaped rotation stopper 22. The rotation stopper 22 is composed of a washer 23, a holding bolt 21, and a nut 24, and a screw hole 22b into which the holding bolt 21 is screwed is formed in the center of the rotation stopper 22, and the width W of the rotation stopper 22 is as follows. It is formed shorter than the width TO of the insertion slit 15 of the frame IA, and its length is formed longer than the word width TO.

Preferably, a notch 22a formed at an angle α is formed at the longitudinal end of the rotation stopper 22, so that the rotation stopper 22 can be rotated diagonally after being inserted into the cavity 16 of the frame IA. The side surface of the notch 22a abuts the side wall surface of the cavity 16,
To prevent excessive idling from occurring. The rotation stopper 22 and the holding bolt 21 are fixed by welding,
It may be rotatably fixed.

Further, a washer 23 is inserted into the holding bolt 21 and a nut 24 is screwed together to form a support member 2 as shown in the lower part of FIG. 1, and this support member 2 is detachable from the frame IA. The structure is as follows. That is, by inserting the rotation stopper 22 into the cavity 16 in the direction of the dashed line arrow through the insertion slit 15, and then turning it approximately 901 degrees to the state indicated by the broken line, the image tip of the rotation stopper 22 is The part is the seat part 14
a, 14b. In this state, the support member 2 is movable along the longitudinal direction of the frame IA.

Next, when the nut 24 is tightened toward the rotation stopper 22, as shown in FIG. 2 (cross-sectional view), the seats 14a and 14b
is sandwiched between the rotation stopper 22 and the washer 23, and the support member 2 is fastened and fixed at any position on the frame 1A. An appropriate number of support members 2 are arranged in the longitudinal direction of the frame body IA, and used for temporary fixing work to be described later.

It is recommended that the frame IA be made of a synthetic resin material, preferably an FRP material loaded with reinforcing glass fibers along the longitudinal direction of the frame, and lightly colored as desired. Ru.

Further, it is desirable that at least the holding bolt 21 in the support member 2 be made of a steel material with high weldability.

On the other hand, in consideration of ease of transportation and manufacturing handling, it is recommended that the frame IA be manufactured as a standard length product of several meters.
In order to connect them together, it is necessary to prepare a connecting tool. FIG. 3 is a perspective explanatory view showing an example of the connector 3. FIG. The connector 3 is a spacer plate 28. Consisting of a fastening bolt 29 and the aforementioned rotation stopper 22, the width of the spacer plate 28 is formed to be the same as or slightly smaller than the width of the cavity 16 of the frame IA, and is in contact with the upper wall surface of the cavity 16. Both ends of the spacer member 28 are configured to be separated by a frame IA and a frame IA, respectively.
It can be inserted into the cavity 16.16 of the IA.

Therefore, when connecting the two frames IA and IA,
First, the frames IA, IA are fitted to both ends of the spacer plate 28, and then the rotation stopper 22 with the fastening bolt 29 screwed thereto is inserted into the cavity 16 of the frame IA and rotated about 90 degrees. Then, the fastening bolt 29 is further tightened to fix the frame IA and the connector 3, as shown in FIG. That is, the rotation stopper 22 is brought into contact with the seats 14a and 14b, and the spacer plate 28 is secured to the cavity 1 of the frame IA using the fastening bolts 29.
6 to fix the spacer plate material 28 and the frame body IA. Therefore, as shown in FIG. 5, an appropriate number of rotation stops 22 can be provided at both ends of the spacer plate 28 to connect the frames IA, IA. The spacer plate 28 in the connector 3 may be straight in the horizontal direction or bent at an arbitrary angle, as shown in FIGS. 6(A) and CB), or may be bent at an arbitrary angle in the vertical direction. , it may be constructed so as to be able to accommodate a sloped portion of the floor surface.

A pit forming construction method when using the above-mentioned receiving frame material 1 will be explained with reference to FIGS. 7 and 8, respectively. First, in the example shown in FIG. 7, primary concrete 32 is poured at a position lower than the bottom of the pit P. At this time, anchor members B made of reinforcing bars or the like are erected at regular intervals in the primary concrete at portions corresponding to the side positions of the pit. Then, the support member 2 temporarily fastened to the frame IA is welded to the anchor material B, and the support member 2 temporarily fastened to the frame IA is welded to the anchor material B.
Temporarily fix A at a predetermined horizontal position at a set height.

At this time, a reinforcing material R such as an angle material may be used for the welding of the holding bolt 21 and the anchor material B, and the supporting member 2 may be further moved in the longitudinal direction of the frame IA, or the supporting member 2 may be moved in the longitudinal direction of the frame IA. may be additionally placed.

Then, the frame IA and the support member 2 are fastened and fixed, and the support member 2 and the anchor material B are also securely fixed.

Next, secondary concrete 34A is placed, and the receiving frame material 1 is buried and fixed using mortar materials 31a and 31b, and the pipes, floor surface, etc. are finished.

On the other hand, in the construction example shown in Figure 8, the existing foundation ground G
Using reinforcing materials R3 to R3 on top, the frame IA is temporarily installed at the set position via the supporting member 2, and concrete (34
B) Form a pit P by pouring, and mortar material 31a
, 31b. This sharpening support member 2
Let's move or add it and use it in the same way as in the above example.

The receiving frame material 1 and the connecting tool 3 of the pit lid in the present invention are not limited to those of the above example, but may be modified as appropriate. Furthermore, the construction method is not limited to the above embodiments,
A method of arranging the receiving frame material 1 at a predetermined position using a concrete form may also be used.

[Effects of the Invention] Since the receiving frame material of the present invention is configured as described above, it can be temporarily installed in a predetermined position in a short time by simple construction work. Furthermore, the connecting tool of the present invention allows the above-mentioned receiving frame members to be easily connected to each other, and the receiving frame members can be temporarily installed efficiently.

Furthermore, by the method of the present invention, the receiving frame material can be efficiently embedded and fixed in concrete, and grooves, pits, etc. can be arranged with simple work.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing a typical embodiment of the receiving frame material of the present invention, Fig. 2 is a sectional view taken along the line II-II in Fig. 1, and Fig. 3 is an implementation of the connector of the present invention. A perspective explanatory view showing an example, FIG. 4 is a cross-sectional view taken along the line IV-rV in FIG. 3, and FIG.
6(8) and (B) are plan views showing other embodiments of the connecting tool of the present invention, and FIGS. 7 and 8 are implementation of the construction method of the present invention. FIG. 9 is an explanatory view showing a conventional arrangement of a receiving frame member of a bit lid, and FIG. 10 is a cross-sectional view showing the structure of a conventional pit. 1... Pit lid receiving frame material IA... Frame body 2... Support member 3...
Connection tool 21... Holding bolt 22... Insertion member 23... Washer 28... Spacer plate material 29... Fastening bolt

Claims (4)

[Claims] (1) A receiving frame material for supporting a pit lid,
The receiving frame material consists of a frame made of synthetic resin and a support member, and the frame has a receiving step portion on which the pit lid is placed, and below the receiving step portion there is provided a support member as described below. A fixing seat portion having a slit for inserting the rotation stopper is formed with a cavity remaining between the support member and the support step, and the support member is attached to the holding bolt with a slit for inserting the rotation stopper and the tightening washer. A receiving frame material for a pit lid, comprising: (2) A connecting tool for connecting the frames described in claim (1), the connecting tool being a spacer plate and a rotation stopper that are inserted between the cavities of each frame to be connected. and a fastening bolt that threads through the rotation stopper and passes through the rotation stopper. (3) In the method for constructing a receiving frame material according to claim (1), a support member is temporarily tightened to the frame body, and then a retaining bolt of the support member is attached to an anchor erected by primary pouring concrete. A receiving frame for a pit lid, characterized in that the frame is welded and fixed to the material, the frame is positioned at a predetermined position, a supporting member is fastened, and the holding bolt and the frame are buried and fixed with secondary concrete pouring. Construction method of materials. (4) In the method for constructing a receiving frame material according to claim (1), a supporting member is temporarily tightened to the frame, and then a retaining bolt of the supporting member is welded and fixed to a reinforcing member fixed to the foundation ground. Also, a method for constructing a receiving frame material for a pit lid, characterized in that the frame body is positioned at a predetermined position, a supporting member is fastened, and then the holding bolt and the frame body are embedded and fixed by pouring concrete.