JP2868928B2 - Inner formwork for installing lid receiving frame for underground structure and method of installing receiving frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for installing a receiving frame of a lid for an underground structure over an opening of an underground structure body such as a sewer manhole block, water and sewage and an underground valve room for gas. The present invention relates to an inner mold and a method of installing a receiving frame using the inner mold.

[0002]

Conventionally, a number of proposals have been made for the mold and the installation method to use when the receiving frame of the lid underground structures installed in accordance with the height of the road surface.

For example, a manhole raising device described in Japanese Utility Model Publication No. Hei 3-3640 has a semicircular arc shape in which one end is hinged and the other end can be expanded and reduced by an interval adjusting member such as a turnbuckle. frame and is constituted by the auxiliary ring piece to fill the gap formed between the other end of the semi-circular frame, mortar space defined by the lower surface of the raised device and concrete frame top and the body frame of this Filling the body frame
(Reception frame) .

[0004]

On the other hand, when an underground structure is installed on a place where the road gradient is steep, the frame itself must be installed horizontally, while the lid body must be installed according to the road gradient. The gap between the upper surface of the skeleton of the underground structure and the lower surface of the lid receiving frame becomes uneven.

[0005] However, since the above-mentioned semicircular frame directly expands or contracts the frame itself by a spacing adjusting member such as a turnbuckle, the frame is made of a rigid enough to withstand the tension or compression. It is formed, and the frame itself cannot be freely deformed in accordance with the site conditions. For this reason, when installing in a place where the road gradient is steep as described above, there is a problem that a gap is formed between the frame, the receiving frame and the semicircular frame, and the mortar cannot be completely filled.

Further, the conventional mortar filled in the gap is accompanied by shrinkage at the time of solidification, so that a gap is formed between the upper surface of the mortar and the receiving frame after hardening, which causes sinking and rattling of the receiving frame. There is also a problem that it takes a long time to cure the mortar until it hardens, so that the road cannot be opened early.

The present invention solves such a conventional problem. Even in a place where the road gradient is steep, the mortar is completely filled with the mortar by filling the mortar with a watertight state. To provide an inner formwork for installing a lid receiving frame for underground structures that can secure a smooth inner peripheral surface without unevenness, and to shorten the construction period by using this formwork and open the road early. It is an object of the present invention to provide a method of setting a receiving frame that can be used.

[0008]

In order to achieve the above object, an inner mold for installing a lid receiving frame for underground structures according to the present invention is provided with a flexible band-shaped elastic mat and a cylindrical deformed shape. And a fixture for pressing the inner peripheral surface of the elastic mat,
The fixing tool, a ring-shaped pressing tool arranged in a plurality of stages vertically,
And a means for expanding and contracting the ring-shaped pressing member.

Further, the method of installing a receiving frame using the inner formwork is such that a receiving frame is disposed above the upper surface of the opening of the underground structure frame, and a gap formed between the upper surface of the opening of the frame and the lower surface of the receiving frame. A belt-shaped elastic mat is deformed into a cylindrical shape along the inner peripheral surface side of the portion, and the inner peripheral surface of the elastic mat is pressed by a fixing device having a ring-shaped pressing tool and expanding / contracting means for expanding / contracting the pressing tool. Then, non-shrinkable and rapidly hardening cement mortar is injected into the void portion and solidified.

[0010]

The inner frame for installing the lid receiving frame for underground structures according to the present invention is formed on the inner peripheral surface side of the gap portion by the fixing member because the frame material is formed of a flexible band-like elastic mat. By pressing, the gap can be completely closed. In addition, even in a place where the road gradient is steep, the road can be freely deformed and adhered to the inner peripheral surface side of the gap. Further, since the plurality of ring-shaped pressing members arranged vertically and the elastic mat are in linear contact with each other, the entire elastic mat can be uniformly pressed by a strong pressing force.

Further, since non-shrinkable and rapidly hardening cement mortar is injected into the space sealed from the inner peripheral side by the inner mold, the working time until hardening is shortened and the solidification time during solidification is reduced. There is no shrinkage, and the stability of the receiving frame after installation is ensured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings.

FIG. 1 is an exploded perspective view of an inner mold for installing a lid receiving frame for an underground structure according to the present invention, FIG. 2 is a perspective view of a guide member,
FIG. 3 is a perspective view showing a part of the enlarging / reducing means.

The inner frame 1 for installing the lid receiving frame for underground structures according to the present embodiment comprises a band-shaped elastic mat 2 and a fixture 3 for pressing and fixing the elastic mat 2.

The resilient mat 2, the passage always are those having flexibility can be deformed into a cylindrical shape during use in belt-like, Oh as it sealability can moreover elastically deformable securing <br/> Re Any material can be used as long as it is used, but in this example, a strip of foamed polyethylene which is excellent in durability and elastic repulsion is used. The elastic mat 2 is formed such that when deformed into a cylindrical shape in accordance with the inner diameter of the receiving frame, the outer diameter is slightly larger than the inner diameter of the opening of the frame. For this reason, when the elastic mat 2 is deformed into a cylindrical shape and brought into contact with the inner peripheral surface of the receiving frame, the elastic mat 2 is entirely compressed, and the elastic mat 2 is disposed in a state of being in close contact with the receiving frame 2 due to its restoring force. be able to.

Reference numeral 4 denotes a steel wire ring-shaped pressing device which is arranged in two stages vertically, and in this embodiment is formed of a piano wire having a diameter of 5 mm. Then, both ends, part of which are opened, and the expansion / contraction means 5 are connected by pins 8a, 9a. In this embodiment, the ring-shaped pressing members 4 are vertically arranged in two stages, but it is of course possible to arrange three or more stages in order to increase the pressing force.

Reference numeral 6 denotes a guide member for arranging the ring-shaped pressing member 4 disposed at an upper portion at a predetermined position. As shown in a detailed view of FIG. 2, the ring-shaped pressing member 4 is inserted through the front surface.
And a slide groove 6a that can slide up and down. Reference numeral 4a denotes a deviation stopper for arranging the guide members 6 at three locations at substantially equal intervals on the circumference. Above the guide member 6, a locking hook 6b that can be hung on the upper edge of the receiving frame is provided to prevent the fixture 3 from falling into the manhole. A stopper 6c is provided in the slide groove 6a to prevent a downward displacement of the ring-shaped pressing tool 4 disposed on the upper side.
Is provided. In addition, the ring-shaped pressing tool 4 arranged at the lower part
Can be freely slid up and down within the range of the slide groove 6a.

As shown in FIG. 3, the expansion / contraction means 5 has connecting pieces 8, 9 connected to both ends of respective ring-shaped pressing members 4 arranged vertically by pins 8a, 9a. The other ends of the pieces 8 and 9 are overlapped and supported by a connecting rod 10. And in this connecting rod 10,
An insertion hole 10a through which the expansion / contraction rod 11 can be inserted is formed in the middle. The expansion / contraction rod 11 has a length close to the approximate diameter of the opening of the receiving frame. One end is connected to the guide member 6 by welding, the other end is inserted through the insertion hole 10a, and a nut 11a for retaining is provided at the tip. Provided. 11b is expansion rod 1
A wing nut screwed into the male screw 11c formed in 1;
By rotating this wing nut 11b, the tip of the
Angle of nuts 11a is moved to the side connecting piece 8, 9 provided on the
It can be expanded to a ring-shaped pressing tool 4 by the large to Rukoto. As a result, an outward pressing force is applied to the elastic mat 2, and the elastic mat 2 can be firmly fixed to the inner peripheral surface of the receiving frame. In the present embodiment, the structure in which the upper and lower ring-shaped pressing members 4 can be simultaneously expanded and contracted as the expansion and contraction means 5 has been described. However, the present invention is not limited to this. It is good also as a structure which does.

Next, a method of installing a receiving frame using the above-described inner mold 1 will be described with reference to FIGS.

FIG. 4 is a sectional view showing the installation of the receiving frame, and FIG.
5 is an enlarged view of a portion A in FIG.

Reference numeral 20 denotes an upper side mass which is a skeleton for an underground structure.
Reference numeral 21 denotes an anchor bolt standing upright on the upper surface of the upper lump 20, and the mounting height of the receiving frame 23 is set by screwing a bulk adjuster 22 to the anchor bolt 21. As shown in FIG. 6, the bulk adjuster 22 has a base part 22a having an upper surface formed in a convex spherical shape, a bolt insertion hole 22b penetrating vertically, and a nut 22c formed by insert molding. . Therefore, the receiving frame 2 against the inclined road surface GL.
In the case where the upper surfaces of 3 are installed in the same state, the screwing positions of the bulk adjusters 22 screwed to the anchor bolts 21 at a plurality of locations are changed to correspond.

[0022] Then, the anchor hole 24 drilled in the bottom flange by inserting the anchor bolt 21 is placed a receiving frame 23 onto the bulk adjuster 22 of receiving frame 23, the anchor bolt 2
A nut 25 is screwed onto 1 and fixed.

[0023] Then, to arrange the elastic pad 2 is deformation in a cylindrical shape so as to close the inner circumferential surface of the gap portion 26 occurring between the upper surface of the lower surface and the upper side mass 20 of the receiving frame 23.

[0024] Then, loosen the wing nut 11b screwed to the scaling rod 11 is inserted from above the fastener 3 illustrated in FIG. 1 a ring-shaped pusher 4 in a state where the reduced diameter into the opening of the receiving frame 23. At this time, the locking hook 6b provided on the guide member 6 is locked to the upper edge of the receiving frame 23.

Next, the ring-shaped pressing tool 4 arranged at the lower part
3 is adjusted according to the inclination of the receiving frame, the wing nut 11b shown in FIG. 3 is tightened to expand the ring-shaped pressing member 4, and the elastic mat 2 is moved to the receiving frame 23 and the inner peripheral surface of the upper side mass 20. Press and fix. At this time, since the ring-shaped pressing member 4 arranged at the upper portion is restrained from shifting downward in the downward direction by the stopper 6c, the ring-shaped pressing member 4 is arranged at an inner peripheral position of the lower end of the receiving frame 23. Further, an elastic mat 27 of the same material as the elastic mat 2 for closing the inner peripheral surface of the gap portion 26 is arranged in a cylindrical shape so as to close the outer peripheral surface side of the gap portion 26, and the fixed band 2 is closed.
Fix at 8,28.

Finally, a non-shrinkable and rapidly hardening cement mortar is inserted into the space 26 defined by the elastic mats 2 and 27 from the anchor hole 24 through which the anchor bolt 21 formed in the receiving frame 23 is not inserted. Inject 29 and cure. Since the inner and outer peripheral surfaces of the cavity 26 are closed by the elastic mats 2 and 27, cement mortar to the outside is
29 can be prevented from flowing out. As the non-shrinkable and rapidly hardening cement mortar 29 used here, for example, a hardening cement containing a calcium-sulfo-aluminate-based expanding agent can be used.

After hardening of the cement mortar 29,
By loosening the wing nut 11b and the fixing band 28 of the inner frame 1, the unframed work can be easily completed.

Although one embodiment of the present invention has been described above, the present invention is not limited to this. For example, each of the upper and lower connecting pieces is pivotally supported by a connecting rod, but this rod is formed to be long downward so that both end portions of the lower ring-shaped pressing tool can also correspond to the gap of the gap. good. In addition, the outer peripheral surface side of the gap is closed with the elastic mat, but may be closed with the use of earth and sand around the receiving frame.

[0029]

As described above, the inner formwork for installing the lid receiving frame for underground structures according to the present invention can freely deform the band-like elastic mat and has a plurality of ring-shaped pressing tools. , The entire elastic mat can be pressed evenly by the strong pressing force. For this reason, even in a place where the road gradient is steep, the mortar can be completely filled by maintaining a watertight state with the void portion into which the mortar is injected. In addition, a smooth inner peripheral surface free of gaps and irregularities can be secured.

Further, the method of installing the receiving frame using the inner mold is as follows:
Since the non-shrinkable and rapidly hardening cement mortar is injected, the time until hardening is shortened, and the stability of the receiving frame after installation is secured without shrinkage during solidification. Moreover, since the construction period can be shortened, the road can be opened early.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an inner formwork for installing a cover receiving frame for an underground structure according to the present invention.

FIG. 2 is a perspective view of a guide member.

FIG. 3 is a perspective view of an enlarging / reducing means.

FIG. 4 is a cross-sectional view showing the installation state of a receiving frame.

FIG. 5 is an enlarged view of a portion A in FIG. 4;

FIG. 6 is a partially cutaway side view showing an example of a bulk adjuster.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inner frame 2 Elastic mat 3 Fixing device 4 Ring-shaped pressing tool 4a Stoppage prevention 5 Expansion / contraction means 6 Guide member 6a Slide groove 6b Locking hook 6c Stopper 8,9 Connection piece 8a, 9a Pin 10 Connection rod 10a Insertion hole 11 Expansion / contraction Rod 11a Nut 11b Wing nut 11c Male screw 20 Upper side lump (body for underground structure) 21 Anchor bolt 22 Bulk adjuster 23 Receiving frame 25 Nut 24 Anchor hole 26 Void 27 Elastic mat 28 Fixed band 29 Non-shrinkable and hard of cement mortar G. L road surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 29/14 E02D 29/12 E04G 15/06

Claims (2)

(57) [Claims] 1. A belt-shaped elastic mat having flexibility, and a fixing device for pressing an inner peripheral surface of the elastic mat deformed into a cylindrical shape, wherein the fixing device includes a plurality of vertically arranged rings. An inner mold for setting a receiving frame for an underground structure, comprising: a pressing member; and an expanding / contracting means for expanding / contracting the ring-shaped pressing member. 2. A belt-shaped elastic mat is disposed above an upper surface of an opening of an underground structure body, and is formed along an inner peripheral surface of a gap formed between an upper surface of the opening of the underground structure and a lower surface of the receiving frame. Is deformed into a cylindrical shape, and the inner peripheral surface of the elastic mat is pressed and fixed by a fixing device provided with a ring-shaped pressing tool and an expanding / contracting means for expanding / contracting the pressing tool, and then is not shrunk to the void portion. A method of installing a lid receiving frame for underground structures, characterized by injecting and solidifying a hard and hard cement mortar.