JPH051426A - Erection method for inner form and support frame for erecting cover support frame of underground structure - Google Patents

Abstract

PURPOSE:To provide improved workability by laying an elastic mat around the inner side of a gap between the opening of an underground structure body such as a manhole, and a cover support frame above the body, and further by forming an inner form, while the mat being secured with a freely contractible anchor. CONSTITUTION:A support frame 23 is laid above the opening of the upper side body 20 of an underground structure, and fixed to suit the slope of a road via an anchor bolt 21 and a height adjustment fixture 22. Then, a strip-like elastic mat 2 made of polyethylene foam or the like is cylindrically fitted elastically along the inner side of a gap 26 between the body 20 and the support frame 23. Then, there is provided an anchor 3 comprising a plurality of vertically arranged open end ring-like pressers 4, expansion means 5 therefor and guide members 6. In addition, the anchor 3 is engaged with the upper end of the support frame 23 via the guide members 6, and the means 5 are expanded for the pressers 4 to press and fix the mat 2. Also, the gap 26 is filled with nonshrink and quick hardening cement 29. According to this construction, even an sharp slope section can be completely filled with mortar, and the stability of the support frame 23 can be maintained. Also, a construction period can be shortened.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is used when installing a receiving frame for an underground structure lid on an opening of an underground structure body such as a sewage manhole side 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]

2. Description of the Related Art Heretofore, many proposals have been made regarding a formwork and a method of installing the formwork to be used when installing the receiving frame of the lid for the underground structure in accordance with the height of the road surface.

For example, a manhole raising device disclosed in Japanese Utility Model Publication No. 3-3640 has a semi-circular shape in which one end is hinged and the other end can be expanded and contracted by a space adjusting member such as a turnbuckle. It is composed of a frame and an auxiliary ring piece that fills the gap formed between the other ends of this semi-circular frame, and the space defined by this frame and the concrete frame upper surface and the lower surface of the main body frame is filled with mortar, etc. I am trying to install a receiving frame.

[0004]

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

However, the above-mentioned semi-circular frame is a frame member having rigidity enough to withstand tension or compression because it is a member for directly expanding or contracting the frame member by a space adjusting member such as a turnbuckle. Since it is formed, the frame material itself cannot be freely deformed according to site conditions. For this reason, when installing in a place where the road slope is steep as described above, there is a problem that a gap is formed between the skeleton and the receiving frame and the semi-arcuate frame and the mortar cannot be completely filled.

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

The present invention solves the above-mentioned problems of the prior art. Even in a place where the road slope is steep, the water-tight state of the cavity for injecting mortar is ensured so that the mortar is completely filled and the gap and We will provide an inner formwork for installation of a lid receiving frame for underground structures that can secure a smooth inner surface of the receiving frame without unevenness, and by using this formwork, the construction period will be shortened and the road will be opened early. The purpose of the present invention is to provide a method of installing a receiving frame that can be used.

[0008]

In order to achieve the above-mentioned object, an inner mold for installing a lid receiving frame for an underground structure of the present invention is made to have 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 is a ring-shaped pressing tool arranged in a plurality of upper and lower stages,
It is characterized by comprising an expansion / contraction means for expanding / contracting the ring-shaped pressing tool.

Further, in the method of installing the receiving frame using the inner formwork, the receiving frame is arranged above the upper surface of the opening of the underground structure skeleton, and a gap is formed between the upper surface of the opening of the skeleton and the lower surface of the receiving frame. The band-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 tool equipped with a ring-shaped pressing tool and expansion / contraction means for expanding / contracting the pressing tool. It is characterized in that non-shrinkable and rapid-hardening cement mortar is injected into the void and solidified.

[0010]

In the inner formwork for installing the lid receiving frame for the underground structure of the present invention, since the frame material is formed of a flexible band-shaped elastic mat, the inner formwork is arranged on the inner peripheral surface side of the void portion and fixed by a fixture. The void can be completely closed by pressing. Moreover, even in a place where the road slope is steep, it can be freely deformed to adhere to the inner peripheral surface of the void. Further, since the plurality of ring-shaped pressing tools arranged above and below and the elastic mat come into linear contact with each other, the entire elastic mat can be uniformly pressed by a strong pressing force.

Further, since non-contractile and quick-hardening cement mortar is injected into the cavity closed from the inner peripheral side by the inner mold, the work time until hardening is shortened and at the time of solidification. There is no shrinkage and the stability of the receiving frame after installation is secured.

[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 formwork for installing a lid receiving frame for an underground structure of the present invention, and FIG. 2 is a perspective view of a guide member.
FIG. 3 is a perspective view showing a part of the expansion / contraction means.

The inner formwork 1 for installing the lid receiving frame for the underground structure of this embodiment comprises a strip-shaped elastic mat 2 and a fixture 3 for pressing and fixing the elastic mat 2.

The elastic mat 2 is always in the form of a strip and is flexible so that it can be deformed into a cylindrical shape at the time of use. Any elastic mat can be used as long as it can ensure hermeticity and can be elastically deformed. However, in this embodiment, a foamed polyethylene strip having excellent durability and elastic repulsion is used. And this elastic mat 2 is
When it is deformed into a cylindrical shape according to the inner diameter of the receiving frame, the outer diameter is formed to be 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 compressed in its entirety, and the elastic force of the restoring force causes the elastic mat 2 to be placed in close contact with the receiving frame 2. be able to.

Numeral 4 is a ring-shaped pressing tool made of steel wire which is arranged in two stages at the top and bottom, and is formed by a piano wire having a diameter of 5 mm in this embodiment. Then, both ends of which a part is opened and the expansion / contraction means 5 are connected by the pins 8a and 9a. In addition, although the ring-shaped pressing tool 4 is arranged in upper and lower two stages in this embodiment, it is of course possible to arrange three or more stages in order to increase the pressing force.

Reference numeral 6 is a guide member for arranging the ring-shaped pressing tool 4 arranged on the upper portion at a predetermined position. As shown in the detailed view of FIG. 2, the ring-shaped pressing tool 4 can be slid up and down on the front surface. The slide groove 6a is provided. Also, 4a
Is a shift stopper for arranging the guide members 6 at three positions on the circumference at substantially equal intervals. A locking hook 6b that can be suspended above the guide frame 6 is provided above the guide member 6 to prevent the fixture 3 from falling into the manhole. In addition, the ring-shaped pressing tool 4 arranged on the slide groove 6a is arranged above.
A stopper 6c is provided to prevent the vertical displacement of the. 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 and 9 connected to both ends of each ring-shaped pressing tool 4 arranged vertically by pins 8a and 9a, and further, both the connection pieces. The other ends of the pieces 8 and 9 are superposed on each other and supported by a connecting rod 10. And on 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 approximately the diameter of the receiving frame opening, one end is welded to the guide member 6, the other end is inserted through the insertion hole 10a, and the tip is provided with a retaining nut 11a. It is provided. 11b is the expansion / contraction rod 1
It is a wing nut screwed to the male screw 11c formed in 1.
By rotating the wing nut 11b and moving it to the side of the nut 11a in the figure, the diameter of the ring-shaped pressing tool 4 can be expanded. As a result, an outward pressing force is applied to the elastic mat 2 and it can be firmly fixed to the inner peripheral surface of the receiving frame. In the present embodiment, as the expansion / contraction means 5, the structure capable of expanding / contracting the upper and lower ring-shaped pressing tools 4 at the same time has been described, but the present invention is not limited to this, and the upper and lower sides can be expanded / contracted independently. It may have a structure.

Next, a method of installing a receiving frame using the above-mentioned inner mold 1 will be described with reference to FIGS. 1 to 6.

FIG. 4 is a sectional view showing the installation condition of the receiving frame, FIG.
[Fig. 4] is an enlarged view of a portion A in Fig. 4.

Reference numeral 20 is an upper side block for underground structures, and 21 is an anchor bolt standing upright on the upper surface of the upper side block 20. The bulk adjusting tool 22 is screwed into the anchor bolt 21 to set the installation height of the receiving frame 23. Set. This bulk adjuster 22 is shown in FIG.
The base portion 22a whose upper surface is formed in a convex spherical shape as shown in FIG.
A bolt insertion hole 22b penetrating up and down is bored, and a nut 22c is insert-molded. Therefore, when the upper surface of the receiving frame 23 is installed in the same state with respect to the sloping road surface GL, the screwing positions of the bulk adjusters 22 screwed onto the anchor bolts 21 at a plurality of positions are changed to correspond to each other. .

Subsequently, the anchor bolt 21 is inserted into the anchor hole 24 formed in the lower flange 23a of the receiving frame 23, the receiving frame 23 is placed on the bulk adjusting tool 22, and the nut 25 is screwed onto the anchor bolt 21. And fix it.

Next, the elastic mat 2 is arranged in a cylindrical shape so as to close the inner peripheral surface side of the void portion 26 formed between the lower surface of the receiving frame 23 and the upper surface of the upper mass 20.

Then, the wing nut 11b screwed to the expansion / contraction rod 11 is loosened, and the fixing member 3 shown in FIG. 1 is inserted into the opening of the receiving frame 23 from above in a state where the ring-shaped pressing member 4 is contracted. At that 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
The installation height 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 tool 4, and the elastic mat 2 is attached to the receiving frame 23 and the inner peripheral surface of the upper lump 20. Press to fix. At this time, since the ring-shaped pressing tool 4 arranged on the upper part is restrained from being displaced in the vertical direction by the stopper 6c, it is arranged on the inner peripheral position of the lower end of the receiving frame 23. An elastic mat 27 made of the same material as the elastic mat 2 that closes the inner peripheral surface of the void portion 26 is arranged in a cylindrical shape so as to close the outer peripheral surface side of the void portion 26, and the fixing band 2 is also provided.
Fix with 8 and 28.

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

After hardening of the mortar 29, the inner mold 1
It is possible to easily complete the deframing work by loosening the wing nut 11b and the fixing band 28.

Although one embodiment of the present invention has been described above, the present invention is not limited to this. For example, although the upper and lower connecting pieces are axially supported by connecting rods, the rods may be formed to be elongated downward so that both end portions of the lower ring-shaped pressing tool can also correspond to the space of the voids. good. Further, although the outer peripheral surface side of the void is closed by the elastic mat, it may be closed by using the earth and sand around the receiving frame.

[0029]

INDUSTRIAL APPLICABILITY As described above, the inner formwork for installing the lid receiving frame for the underground structure of the present invention is capable of freely deforming the band-shaped elastic mat, and a plurality of ring-shaped pressing tools arranged. The elastic mat can be pressed evenly by a strong pressing force. Therefore, even in a place where the road slope is steep, it is possible to ensure a watertight state with the void portion into which the mortar is injected and to completely fill the mortar. Moreover, it is possible to secure a smooth inner peripheral surface of the receiving frame without gaps or irregularities.

The method of installing the receiving frame using this inner mold is as follows:
Since non-shrinking and rapid-hardening cement mortar is injected, the time until hardening is shortened, and there is no shrinkage during solidification, and the stability of the receiving frame after installation is secured. Moreover, since the construction period can be shortened, the road can be opened early.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an inner formwork 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 of expansion / contraction means.

FIG. 4 is a cross-sectional view showing how the receiving frame is installed.

5 is an enlarged view of part A in FIG. 4. FIG.

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

[Explanation of symbols]

1 Inner formwork 2 elastic mat 3 fixtures 4 Ring-shaped pressing tool 4a Displacement prevention 5 scaling means 6 Guide member 6a slide groove 6b Locking hook 6c stopper 8,9 connecting piece 8a, 9a pin 10 Connecting rod 10a insertion hole 11 Expansion / contraction rod 11a nut 11b wing nut 11c male screw 21 anchor bolt 22 Bulk adjuster 23 receiving frame 25 nuts 24 anchor holes 26 Void 27 elastic mat 28 fixed bands 29 Cement mortar G. L road surface

Claims (2)

[Claims] 1. A flexible band-shaped elastic mat, and a fixing tool for pressing the inner peripheral surface of the elastic mat deformed into a cylindrical shape, the fixing tool having a plurality of vertically arranged rings. An inner formwork for installing a receiving frame for an underground structure, comprising an annular pressing member and an expansion / contraction means for expanding / contracting the ring pressing member. 2. A strip-shaped elastic mat is arranged along the inner peripheral surface side of a void portion formed between the upper surface of the opening of the skeleton and the lower surface of the receiving frame, the receiving frame being arranged above the upper surface of the opening of the underground structure skeleton. Is deformed into a cylindrical shape and arranged, and the inner peripheral surface of the elastic mat is pressed and fixed by a fixture equipped with a ring-shaped pressing tool and expansion / contraction means for expanding / contracting the pressing tool, and then non-shrinkable in the void. A method for installing a lid receiving frame for an underground structure, which comprises injecting a solid and rapid-hardening cement mortar to solidify it.