JP3557357B2 - Inner formwork for installing receiving frame of square lid for underground structure and method of installing receiving frame - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inner mold used when installing a receiving frame of a square lid for an underground structure on an opening of a body such as a sewer manhole side lump as an underground structure, an underground valve room for water supply and gas, and the like. The present invention relates to a frame and a method of installing a receiving frame using the inner mold.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various proposals have been made for an inner form used for installing a receiving frame of a rectangular lid for an underground structure in accordance with the height of a road surface and a receiving frame installation method using the inner form.
[0003]
For example, in Japanese Unexamined Patent Publication No. Hei 5-22738, an inner mold is provided along the upper concrete block of the square manhole and the inner peripheral surface of the upper lid frame 15. The inner frame includes an inner frame 23 made of a foamed polyurethane sheet or the like, and a tightening jig 31 provided on the inner frame 23. The tightening jig 31 has a rectangular shape with a cushion material attached to the outside. At the four corners of the metal band frame 32, tension mechanisms (turn buckles) 34 for tightening the corners and the linear portions of the metal band frame 32 are provided. The metal band frame 32 is tensioned by the tension mechanism 34, and mortar or the like is filled between the upper concrete block and the upper lid frame 15.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional inner frame, the four corners of the metal band frame 32 provided on the inner peripheral surface side of the inner frame 23 are tensioned by the tension mechanism 34, so that the construction time is unnecessarily long. There was a problem. Moreover, since it is necessary to adjust the four tension mechanisms 34 individually, a difference is likely to occur in the manner in which each tension mechanism 34 is tensioned. Since there is a possibility that a gap is formed between the inner mold and the mortar from the gap, there is a problem in terms of the reliability of construction.
[0005]
The present invention has been made in view of the above, and an object of the present invention is to provide an inner formwork for receiving frame installation of a square lid for an underground structure and a method of installing the receiving frame, which can easily and reliably install the receiving frame. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an inner frame for installing a receiving frame of a square lid for an underground structure according to the present invention has a corner having an inner peripheral surface above a rectangular frame having an arc-shaped portion at an inner peripheral corner. This is an inner frame for receiving frame installation of a square lid for underground structures used when installing a square receiving frame having an arc-shaped part , which is always band-shaped and can be deformed into a square tubular shape when used. And has a length such that its outer diameter is slightly larger than the inner diameter of the frame and the receiving frame when deformed into a rectangular cylindrical shape, and the inner circumference of the frame and the receiving frame. An inner frame having a thickness capable of being curved along the corner of the surface, and mounted inside the inner frame attached along the respective inner peripheral surfaces of the frame and the receiving frame, and by an elastic force. And a pressing member for pressing at least a linear portion of the inner frame in an outward direction.
[0007]
With this configuration, the inner frame is attached along the respective inner peripheral surfaces of the rectangular frame and the receiving frame disposed above the frame, and at least the linear portion of the inner frame is pressed by the elastic force of the pressing member. By pressing the inner frame against the frame and the receiving frame by pressing outward, the inner peripheral side of the gap formed between the frame and the receiving frame above it can be easily and reliably sealed with the inner frame. .
[0008]
Further, the method for installing a receiving frame of a rectangular lid for underground structures according to the present invention includes the step of providing an arc-shaped portion at a corner of the inner peripheral surface at a predetermined interval above a rectangular frame having an arc-shaped portion at the inner peripheral corner. A rectangular receiving frame having a is provided, and the inner peripheral surface of each of the skeleton and the receiving frame has a flexibility that can always be deformed into a rectangular tube shape when used in a band shape, and is deformed into a rectangular cylindrical shape. When the outer diameter is slightly larger than the inner diameter of the skeleton and the receiving frame, the outer diameter of the skeleton can be curved along the inner peripheral surface of the skeleton and the receiving frame. Attach an inner frame having a thickness, and attach an elastic pressing member to the inside of the inner frame so as to press at least a linear portion of the inner frame outward with an elastic force, between the frame and the receiving frame. The cement mortar is injected into the voids that occur and solidified.
[0009]
In this method of installing the receiving frame, the inner frame of the present invention is used to install the receiving frame in the skeleton, so that the inner peripheral side of the gap formed between the skeleton and the receiving frame can be reliably sealed by the inner frame, and this gap Even if the cement mortar is poured into the mortar, the cement mortar does not leak inward from the void. In addition, since only the inner frame and the pressing member are used, the number of parts is small, and it is only necessary to mount them.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
In the inner frame for installing the receiving frame of the rectangular lid for underground structure of the present invention, the pressing member is formed in a cylindrical shape when mounted on the inner side of the inner frame, and the outer peripheral surface thereof is formed at four positions of the inner frame. Since the pressing member is configured to contact the straight portion, the pressing member contacts the inner frame in a relatively large area, and the pressing member presses the inner frame against the skeleton and the receiving frame with a stronger force.
[0011]
Further, in the inner frame for installing the receiving frame of the rectangular lid for underground structure of the present invention, the pressing member has two beam portions crossing each other, and each beam portion is made expandable and contractable by elastic force. In addition, when it is not mounted on the inner frame, its length is formed longer than the interval between the opposing linear portions of the inner frame. Since the beams are configured to be in contact with each other, each beam presses the linear portion of the inner frame against the frame and the receiving frame with an elastic force corresponding to the contracted length.
[0012]
Further, since a plate is provided at each of the ends of the beam, the contact area between the beam and the straight portion of the inner frame is increased, and the beam more reliably presses the inner frame against the frame and the receiving frame.
[0013]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a perspective view showing a state in which the inner formwork of the present invention is mounted on a square frame and a receiving frame installed above the underground structure, and FIG. 2 is a view showing the state shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 in a state, and FIG. 3 is a vertical cross-sectional view showing a mounting state of the inner and outer mold frames.
[0015]
The inner frame 1 of the present invention shown in this embodiment includes an inner frame 2 attached along the inner peripheral surfaces 4a and 5a of the rectangular frame 4 and the receiving frame 5 on the upper part of the underground structure, A pressing member 3 is mounted inside the inner frame 2 and presses the inner frame 2 outward by elastic force.
[0016]
Anchor bolts 41 are erected at the four corners of the upper flange 4b of the frame 4. On the other hand, anchor holes 51 are formed in the receiving frame 5 at the four corners of the lower flange 5b and the center of each straight portion. Then, the receiving frame 5 is installed above the frame 4 in the following procedure. First, as shown in FIG. 3, a bulk adjusting tool 42 is screwed into each of the anchor bolts 41 of the frame 4, and the installation height is set so that the upper surface of the receiving frame 5 coincides with the road surface. A nut (not shown) is insert-molded in a bolt insertion hole (not shown) at the center of the bulk adjuster 42 so that a screwing position with the anchor bolt 41 can be adjusted. Next, the anchor bolt 41 is inserted into the anchor hole 51, and the receiving frame 5 is placed on the bulk adjuster 42. Subsequently, the fixing block 52 is inserted, the protrusion 52 a is fitted into the anchor hole 51, and the nut 53 is screwed into the anchor bolt 41 to fix the receiving frame 5 on the bulk adjuster 42. Thereafter, the nut 53 is fitted into the hole of the rotation preventing cap 54, and the rotation preventing cap 54 is locked to the fixed block 52 to prevent the nut 53 from loosening.
[0017]
In this manner, the volume of the receiving frame 5 is adjusted, and the inner frame 2 is provided on the inner peripheral side of the gap 6 formed between the skeleton 4 and the receiving frame 5, and the outer frame 7 is provided on the outer peripheral side. And the inner peripheral surfaces 4a and 5a and the outer peripheral surface of the receiving frame 5 to seal the gap 6.
[0018]
The inner frame 2 is always in a band shape and has flexibility that can be deformed into a rectangular tube shape when used. In the present embodiment, a band-shaped material of foamed polyethylene is used. The inner frame 2 has a length such that its outer diameter becomes slightly larger than the inner diameter of the skeleton 4 and the receiving frame 5 when deformed into a rectangular tube shape in accordance with the inner diameter of the skeleton 4 and the receiving frame 5. The gap 6 can be reliably sealed. However, when such a band-shaped inner frame 2 is adhered along the inner peripheral surfaces 4a, 5a of the frame 4 and the receiving frame 5, the inner frame 2 is deformed into a substantially compressed rectangular cylindrical shape. As it is, the straight portion 21 of the inner frame 2 tends to protrude inward. Then, the pressing member 3 is attached inside the inner frame 2 and the linear portion 21 of the inner frame 2 is pressed to securely attach the inner frame 2 to the inner peripheral surfaces 4 a and 5 a of the frame 4 and the receiving frame 5. I have to.
[0019]
The pressing member 3 is made of foamed polyethylene similarly to the inner frame 2 and is always in a belt shape so that it can be deformed into a rectangular tube shape when used. When the band-shaped pressing member 3 is mounted inside the inner frame 2 while being deformed into a rectangular tube shape, the pressing member 3 presses the four linear portions 21... It is pressed against the frame 4 and the receiving frame 5. Therefore, the inner peripheral side of the gap 6 is securely sealed by the inner frame 2.
[0020]
The inner frame 2 has a thickness that can be curved along the corners of the inner peripheral surfaces 4a and 5a of the frame 4 and the receiving frame 5, so that the gap 6 can be securely sealed. The pressing member 3 is thicker than the inner frame 2 to increase the restoring force so that the linear portion 21 of the inner frame 2 can be reliably pressed, and has a length that can be mounted inside the inner frame 2. Formed.
[0021]
On the other hand, the outer frame 10 includes an outer frame 7 that seals the gap 6 from the outer peripheral side, a contact plate 8 that contacts the linear portion 71 of the outer frame 7, and a fixing band 9 that fixes the outer frame 7 and the contact plate 8. It is composed of The outer frame 7, like the inner frame 2 and the pressing member 3, is formed of foamed polyethylene, and is always in a band shape so that it can be deformed into a rectangular tube shape during use. Is attached along the outer peripheral surfaces 4c and 5d of the upper flange 4b of the frame 4 and the lower flange 5b of the receiving frame 5 while being deformed into a rectangular cylindrical shape. An abutment plate 8 is applied to each of the linear portions 71 of the outer frame 7, and the entire periphery of the outer frame 7 is fixed by a fixing band 9 via the abutment plate 8. Therefore, the outer peripheral side of the gap 6 is also securely sealed by the outer frame 7 .
[0022]
As described above, when the inner frame 2 and the outer frame 7 are attached to the gap 6 and the gap 6 is sealed, finally, the gap 6 is inserted through the anchor hole 51 of the receiving frame 5 where the anchor bolt 41 is not inserted. Then, a non-shrinkable and rapidly hardening cement mortar 11 is poured and solidified, and then a de-frame work is performed. As the non-shrinkable and rapidly hardening cement mortar 11, for example, a rapidly hardening cement containing a calcium-sulfo-aluminate-based expanding agent can be used.
[0023]
In this embodiment, as described above, the pressing member 3 is mounted inside the inner frame 2 and the linear portions 21 of the inner frame 2 are pressed outward by the elastic force of the pressing member 3 itself to form the frame 4 and Since the pressing member 3 is pressed against the receiving frame 5, the inner peripheral side of the gap 6 is securely sealed by the inner mold frame 1 including the inner frame 2 and the pressing member 3. Therefore, even if the cement mortar 11 is injected into the gap 6, the cement mortar 11 does not leak from the gap 6 to the inside, and the construction can be performed reliably.
[0024]
Furthermore, since only the inner frame 2 and the pressing member 3 are used as the inner mold frame 1, the number of parts is small, and they need only be deformed and mounted, respectively. In addition, the mounting work and the frame removing work can be performed extremely easily, and the time required for the construction can be significantly reduced as compared with the related art.
[0025]
In the above description, the inner frame 2, the pressing member 3 and the outer frame 7 are made of foamed polyethylene. However, the inner frame 2 and the outer frame 7 can be deformed and hermetically sealed. Any member can be used as long as it has elasticity.
[0026]
In addition, the inner frame 2, the pressing member 3, and the outer frame 7 are always in a band shape and are deformed into a rectangular tube shape at the time of use, but may be formed in a rectangular tube shape in advance.
[0027]
Further, the outer peripheral surface side of the cavity 6 is sealed with the outer mold frame 10, but may be sealed with earth and sand around the receiving frame.
[0028]
Next, various aspects of the inner mold of the present invention will be described in order with reference to FIGS.
[0029]
FIG. 4 is a view showing a second embodiment of the present invention. In the first embodiment described above, but were inside instrumentation wear of the inner frame 2 while deforming the strip-shaped pressing member 3 to the rectangular tube, in this second embodiment, when forming the cross-shaped are different . That is, the pressing member 103 of the second embodiment is formed of foamed polyethylene similarly to the pressing member 3 of the first embodiment, and has two elongated rectangular parallelepiped beams 131 and 132 at the center in the length direction. The recesses 131a and 132a provided are fitted to each other so as to cross each other in a cross shape. Each of the beam portions 131 and 132 is formed such that its length is longer than the interval between the opposed linear portions 21 and 21 of the inner frame 2 when not attached to the inner frame 2. In the state of being mounted on the inner frame 2, each of its ends is brought into contact with the linear portions 21 of the inner frame 2 by elastic force. Each of the beam portions 131 and 132 presses the linear portions 21 of the inner frame 2 outward by an elastic force corresponding to the contracted length, thereby pressing the inner frame 2 against the frame 4 and the receiving frame 5.
[0030]
In the second embodiment, the same effect as in the first embodiment is obtained, such as the effect of ensuring the tightness of the gap 6 by the inner frame 2, and the beams 131 and 132 are simply brought into contact with the inner frame 2. Therefore, the workability can be further improved as compared with the case of the first embodiment in which the band-shaped pressing member is deformed into a rectangular cylindrical shape along the inside of the inner frame 2.
[0031]
In the second embodiment, the beams 131 and 132 formed separately are combined in a cross shape, but may be integrally formed in a cross shape from the beginning instead of being formed separately.
[0032]
FIG. 5 is a view showing a third embodiment of the present invention. The third embodiment is different from the above-described second embodiment in that each beam portion is formed using a telescopic rod. That is, the pressing member 203 of the third embodiment is configured by arranging two beam portions 231 and 232 using a telescopic bar in a cross shape. Note that the two beams 231 and 232 have the same configuration except for the length, and therefore, only one beam 231 will be described here.
[0033]
The beam portion 231 includes a rod-shaped tube portion 230 formed by loosely fitting the inner tube 231b to the outer tube 231a, and plates 231c attached to both ends of the tube portion 230, that is, the respective ends of the outer tube 231a and the inner tube 231b. 231d, a coil spring 231e is inserted into the cylindrical portion 230, and the beam portion 231 can be expanded and contracted as a whole. Then, in a state where the cylindrical portion 230 is not mounted on the inner frame 2, the length of the cylindrical portion 230 is formed to be longer than the interval between the opposed straight portions 21 and 21 of the inner frame 2. When mounted inside the inner frame 2, the plates 231 c and 231 d are pushed toward the center of the cylindrical portion to shrink the cylindrical portion 230, and the whole is put inside the inner frame 2. Are brought into contact with the corresponding linear portions 21 and 21. The beam portion 231 presses each linear portion 21 of the inner frame 2 outward by an elastic force corresponding to the contracted length of the coil spring 231e, and presses the inner frame 2 against the frame 4 and the receiving frame 5.
[0034]
In the third embodiment, the same effects as the first and second embodiments described above can be obtained, such as securing the airtightness of the gap 6 by the inner frame 2 and improving workability. Are provided with the plates 231c and 231d, the contact area between the beam portion 231 and the linear portion 21 of the inner frame 2 can be sufficiently ensured even if the beam portion 231 is rod-shaped, and the inner frame 2 is securely connected to the frame 4 and the receiving frame. 5 can be pressed.
[0035]
In the third embodiment, the configuration is such that the elastic force of the coil spring 231e inserted inside the cylindrical portion 230 is used. However, the present invention is not limited to this configuration. , A cylindrical support rod may be fixed to the support rod, and a coil spring inserted into the support rod may be arranged on the outer periphery of the other support rod.
[0036]
【The invention's effect】
As described above, in the inner frame for receiving frame installation of the rectangular lid for underground structures and the method of installing the receiving frame of the present invention, the flexibility attached to the inner peripheral surface of each of the rectangular frame and the receiving frame is improved. Since the pressing member is attached to the inside of the inner frame having, and at least the linear portion of the inner frame is pressed outward by the pressing member having elastic force, the inner frame can be pressed against the skeleton and the receiving frame, and the skeleton and the receiving frame can be pressed. Can be simply and reliably sealed from the inner peripheral surface side. Therefore, even if the cement mortar is injected into the space where the inner peripheral surface is sealed, the cement mortar does not leak to the inner peripheral surface, so that the receiving frame can be reliably installed.
[0037]
Further, the pressing member is formed in a tubular shape when mounted on the inner side of the inner frame, and the outer peripheral surface thereof is configured to abut on the four linear portions of the inner frame. By pressing the inner frame in the region, the inner frame can be securely attached to the skeleton and the receiving frame. In addition, since the number of parts is small and it is only necessary to deform and mount each of them, the work can be performed easily and reliably.
[0038]
Further, the pressing member is composed of two beam portions that intersect each other, and each beam portion can be expanded and contracted by elastic force, and its length is opposed to the inner frame when not attached to the inner frame. It is formed to be longer than the interval between the straight portions, and when mounted on the inner frame, each of its distal ends is in contact with the straight portion of the inner frame. In this case, the two beam portions are deformed and the inner portion is deformed. It is only necessary to simply contact the frame, and the workability can be further improved.
[0039]
Further, when the pressing member is formed of two beams, the plate is provided at each of the ends of the beams, so that a sufficient contact area with the linear portion of the inner frame can be secured. However, the inner frame can be reliably pressed against the frame and the receiving frame.
[0040]
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which an inner mold of the present invention is mounted on a square frame and a receiving frame installed above an underground structure.
2 is a transverse sectional view along line A-A of FIG. 1 in a state of mounting the outer molds to further to those shown in FIG.
FIG. 3 is a vertical cross-sectional view showing a mounting state of an inner mold frame and an outer mold frame.
FIG. 4 is a perspective view showing a second embodiment of the present invention.
FIG. 5 is a perspective view showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner frame 2 Inner frame 21 Straight part 3 of inner frame 3 Pressing member 4 Body 4a Inner peripheral surface 4b Upper flange 4c of frame Outer peripheral surface 41 Anchor bolt 42 Bulk adjuster 5 Receiving frame 5a Inner peripheral surface 5b of receiving frame Lower flange 5c Opening 5d of receiving frame Outer peripheral surface 51 Anchor hole 52 Fixed block 52a Projection 53 Nut 54 Rotation preventing cap 6 Void 7 Outer frame 71 Straight portion of outer frame 8 This plate 9 Fixed band 10 Outer frame 11 Cement mortar 103 pressing member 131 beam 132 beam 131a beam recess 132a beam recess 203 pressing member 230 cylinder 231 beam 232 beam 231a outer cylinder 231b inner cylinder 231c plate 231d plate 231e coil spring

Claims (5)

Receiving frame for underground structure rectangular lid used when installing a rectangular receiving frame having an arc-shaped portion at the inner peripheral corner above a square frame having an arc-shaped portion at the inner peripheral corner An inner formwork for installation,
It has the flexibility that it can be deformed into a rectangular tube at the time of use in a band shape at all times, and when it is deformed into a rectangular tube, its outer diameter is slightly larger than the inner diameter of the frame and the receiving frame. An inner frame having a sufficient length and having a thickness capable of being curved along a corner of the inner peripheral surface of the frame and the receiving frame,
A pressing member attached to the inside of the inner frame attached along the respective inner peripheral surfaces of the frame and the receiving frame, and pressing at least a linear portion of the inner frame outward by elastic force,
An inner formwork for setting a receiving frame of a square lid for an underground structure, comprising: The underground structure according to claim 1, wherein the pressing member is formed in a tubular shape when mounted on the inner side of the inner frame, and an outer peripheral surface thereof is configured to contact four linear portions of the inner frame. Inner formwork for setting the receiving frame of the square lid for objects. The pressing member has two beam portions that intersect each other, and each beam portion can be expanded and contracted by elastic force, and the length thereof is opposed to the inner frame when not attached to the inner frame. The receiving frame of the rectangular lid for an underground structure according to claim 1, wherein the receiving frame is formed to be longer than the interval between the linear portions, and each of its ends abuts on the linear portion of the inner frame when mounted on the inner frame. Inner formwork for installation. The inner formwork for installing the receiving frame of the square lid for underground structures according to claim 3, wherein the beam portion has a plate at each of its ends. A square-shaped receiving frame having an arc-shaped portion is installed at a predetermined interval above a corner-shaped frame having an arc-shaped portion at the corner of the inner peripheral surface at a predetermined interval. The peripheral surface has a flexibility that can be deformed into a rectangular tube shape when used at all times , and when deformed into a rectangular tube shape, the outer diameter is slightly smaller than the inner diameter of the frame and the receiving frame. Along with a length so as to be large, an inner frame having a thickness capable of being curved along a corner of the inner peripheral surface of the frame and the receiving frame is attached, and an inner frame is provided inside the inner frame. To press at least the linear portion outward with elastic force, a pressing member having elasticity is attached, and cement mortar is injected and solidified into a void generated between the frame and the receiving frame,
A method for setting a receiving frame of a square lid for an underground structure.

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