JP3759493B2 - Repair method around the manhole cover frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing steps, cracks, and the like generated in a manhole portion and a pavement portion around the manhole portion.
[0002]
[Prior art]
In underground pipelines such as sewers and power cables, manholes M for maintenance work that rise from the pipeline and lead to the ground are constructed at appropriate intervals. The manhole M has a structure in which a cover frame 2 for receiving a manhole cover 3 is provided on a concrete cylindrical neck 1 embedded in the ground, and the periphery of the cover frame 2 is paved.
[0003]
In the manhole M provided on the road, when a vehicle or the like passes over the manhole M, the lid frame 2 supporting the lid 3 of the manhole M sinks, or a crack occurs in a pavement or the like on the road surface around the manhole M. . For this reason, it is necessary to increase the height of the lid frame 2 and adjust it to a predetermined road surface height to repair steps and cracks caused by the settlement of the surrounding pavement. For this repair, various methods have been conventionally performed, and various techniques have been disclosed.
[0004]
For example, as a method of adjusting the height of the lid frame 2, as shown in FIG. 6, a part of the neck 1 that supports the lid frame 2 in the upper part of the neck 1 on the inner periphery of the manhole M is used. Is provided with a jack hole 4, the jack 5 is placed in the jack hole 4, and the plunger 5 a at the upper part of the jack 5 is brought into contact with the lower surface of the lid frame 2. In this state, the jack 5 is operated to raise the lid frame 2 so that the upper end of the lid frame 2 is flush with the road surface, and padding is performed between the neck 1 and the lid frame 2 to fix the lid frame 2. After that, the gap is filled with cement or the like.
[0005]
For example, as shown in FIG. 7, the lid frame itself is provided with an anchor bolt insertion hole 13 and a jack bolt insertion hole 14 in the lid frame 12 fixed to the neck 11 of the manhole M. There is one in which the lid frame 12 can be moved up and down with respect to the neck 11 by rotating a jack bolt 15 screwed into the insertion hole 14 (see, for example, Patent Document 1).
[0006]
Further, as a lid frame having an up-and-down function of another structure, as shown in FIG. 8, a lid frame 18 including an outer cylindrical body 16 and a lid receiving frame body 17 is provided on the upper part of the manhole M, and the inner side of the outer cylindrical body 16 There is a structure in which a receiving seat 16a is provided at the lower portion, and the receiving seat 16a and the lid receiving frame body 17 are bolted together with a jack bolt 15. By loosening the jack bolt 15 and inserting a liner 19 between the seat 16a and the lid receiving frame 17, the lid receiving frame 17 can be raised and lowered with respect to the outer cylinder 16 and the neck 11 (for example, , See Patent Document 2).
[0007]
[Patent Document 1]
JP 2000-87376 A [Patent Document 2]
Japanese Patent Laid-Open No. 10-60932
[Problems to be solved by the invention]
However, in the conventional repair method shown in FIG. 6, since the concrete neck 1 must be shaved in the manhole M, a large noise is generated during the work, and pollution due to the noise becomes a problem. Further, the shaving work and jack-up work are work in a narrow manhole M where a sufficient work space cannot be secured. For this reason, in the same manhole M, a plurality of persons cannot work at the same time, so the efficiency is low, and the work is performed in an unstable posture.
[0009]
Moreover, since the repair method shown in FIG.7 and FIG.8 must have the function to raise / lower the lid frame itself with respect to the neck 11, in the manhole M which has the existing lid frame 2 which does not have this raising / lowering function. ,I can not use it.
[0010]
Therefore, an object of the present invention is to perform work efficiently in an existing manhole.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention fixes a receiving member straddling the upper surface of the manhole's neck to the ground at both ends, and the lower end of the bulky member provided on the receiving member so as to be able to be raised and lowered is attached to the lid frame Lock. By raising the raising member with a driving machine, the lid frame locked by the raising member is raised and raised to a predetermined height, and the lid frame is fixed to the neck at that position, and the lid Repair with a repair material packed around the frame.
[0012]
According to this repair method, work can be performed from the ground side outside the manhole, so that a wide work space can be secured, and the work posture and work efficiency can be improved.
[0013]
As a specific form of the bulking member, it has a horizontal locking surface facing the upper end and the lower end, a jack is mounted as a driving device on the receiving member, and a jack plunger is mounted on the locking surface of the upper end. Means for lowering the engaging surface of the lower end from the lower part, and for engaging the bulking member with the lid frame, and lifting the bulking member by the operation of a jack. Can be adopted.
[0014]
In this way, the bulking member can be easily lifted and lowered using a known hydraulic jack or the like, so the work is simple.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
One embodiment is shown in FIG. 1 to FIG. 4, and the repair method around the manhole cover frame of this embodiment is provided with a cover frame 2 at the upper end of a concrete cylindrical neck 1 embedded in the ground G, and the cover In the manhole M in which the lid 3 is fitted to the frame 2, the receiving member 7 straddling the upper surface of the neck 1 is grounded at both ends in order to raise the lid frame 2 sunk with respect to the surrounding road surface to a predetermined height. It fixes to G, the raising member 8 is provided in the receiving member 7 so that raising / lowering is possible, and the lid frame 2 is latched by the raising member 8. By raising the raising member 8 with the drive unit 6, the lid frame 2 locked by the raising member 8 is raised to a predetermined height, and the lid frame 2 is fixed to the neck 1 at that position, This is a repair method for repairing road pavement and the like on the ground G by packing repair material around and below the lid frame 2.
[0016]
The bulky member 8 has horizontal locking surfaces 8a and 8b opposed to the upper and lower ends thereof, and as shown in FIG. 2, an insertion hole 7a provided in the middle of the receiving member 7 in the vertical direction. The bulky member 8 is inserted into the bulkhead member 8, and the bulky member 8 is attached to the receiving member 7 so as to be movable up and down. At this time, as shown in FIG. 3, if the locking surfaces 8a and 8b can be attached to and removed from the bulky member 8 with bolts 8c or the like, the bulky member 8 is removed from the insertion hole 7a after the work is completed. The receiving member 7 and the bulky member 8 can be removed. The receiving member 7 has a beam shape, and its length is not limited as long as it is long enough to straddle the neck 1 of the manhole M.
[0017]
When raising the lid frame 2 with respect to the neck 1, first, at the base 2 b of the lid frame 2, the nut of the anchor bolt 10 that fixes the lid frame 2 and the neck seat 1 is loosened and released. As shown in FIG. 2, the anchor bolts 10 are provided at several anchor portions A provided on the outer peripheral portion of the lid frame 2 by being screwed into the neck 1 through the base portion 2b. In a normal laying state, As shown in FIG. 1, the entire anchor portion A including the anchor bolt 10 is covered with protective concrete C, a paving material, and the like.
[0018]
The road pavement and the like above the anchor portion A is scraped off by a known core machine with a suitable area, and the protective concrete C and the like covering the anchor portion A are removed. Next, the nut tightening the anchor bolt 10 is loosened and removed, or when the nut is fixed, the anchor bolt 10 itself is cut and removed, and the anchor bolt 10 is released.
[0019]
When the anchor bolt 10 is released, the lid frame 2 is cut off from the neck 1 and the lid frame 2 is raised in several places along the circumference of the lid frame 2 by the following means.
[0020]
As shown in FIG. 3, the lifting work is performed by placing a hydraulic jack 5 as a driving device 6 on the receiving member 7 and placing the plunger 5a of the jack 5 on the locking surface 8a of the upper end from below. . The shape of the locking surface 8a is not limited as long as it has a sufficient area for the upper end of the plunger to contact.
[0021]
A flange 2a as shown in FIG. 1 is usually provided on the inner periphery of the lid frame 2, and the locking surface 8b of the lower end is directed from the lower part of the flange 2a, so that the bulky member 8 The lower end is locked to the lid frame 2. This locking position may be any position on the inner periphery of the lid frame 2, but if it is locked near the anchor portion A, it is close to a fixing location between the neck 1 and the lid frame 2, which will be described later. Easy.
[0022]
When the hydraulic jack 5 is operated and the plunger 5a pushes up the locking surface 8a, the bulky member 8 rises as shown by an arrow a in FIG. 1, and is locked by the locking surface 8b along with the rise. The lid frame 2 is raised as indicated by the arrow b in FIG. In order to set the lid frame 2 to a predetermined height, the height of the lid frame 2 is measured by level or the like while performing the above-mentioned raising, and when the predetermined height is reached, the operation of the jack 5 is stopped, Exit. Since this operation can be performed from the ground side outside the manhole M, a plurality of people can work simultaneously and is efficient.
[0023]
A pedestal receiving bolt 9 is screwed in the vertical direction into the base 2b of the lid frame 2, and after the lid frame 2 is raised to the predetermined height, the pedestal receiving bolt 9 is rotated in that state, Is moved forward and backward to contact the upper surface of the neck 1. By this contact, the lid frame 2 is held in the vertical direction with respect to the neck 1 and maintains its height.
[0024]
Subsequently, the height of the lid frame 2 is finely adjusted by rotating the pedestal receiving bolt 9 and raising / lowering the lid frame 2 by the jack 5, and then the tips of all bolts 9 are applied to the upper surface of the neck 1 at that position. The lid frame 2 is stabilized by contact, and a nut is attached to the anchor bolt 10, and the nut is tightened to prevent rotation, and the attachment of the lid frame 2 to the neck 1 is completed. When the anchor bolt 10 is removed, the anchor bolt 10 is screwed into the neck 1 again and tightened with a nut, and the lid frame 2 is fixed to the neck 1.
[0025]
Then, the bulkiness member 8 and the like are removed from the lid frame 2, and a repair material is packed in the gap formed between the neck 1 and the ground G around and below the lid frame 2. The repair material is preferably a material that can be filled and injected into a narrow gap, such as cement or mortar, and if necessary, a coagulation time adjusting material may be added. At this time, if a liner R or the like sandwiched between the base of the lid frame 2 and the neck 1 is used in combination, the fixation of the lid frame 2 can be further stabilized.
[0026]
When this work is completed and the repair material is solidified, the inner surface of the neck 1 is finished with mortar, a filler, etc., and then the unevenness and cracks of the pavement around the lid frame 2 are made of a step correction material such as asphalt emulsion. Repair. At this time, the pavement around the lid frame 2 is cut as shown by the broken line in FIG. 4 using a known asphalt cutter C, and the damaged pavement inside the cut line is removed within a certain range, and then removed again. Pavement such as asphalt can be performed on the entire part. In this way, the unevenness of the pavement accompanying the sinking of the lid frame 2 can be removed over a wide range, so the finish is beautiful.
[0027]
In the above embodiment, the road surface pavement and the like above the anchor portion A is first cored with an appropriate area by a core machine and the protective concrete covering the anchor portion A is removed before the lifting work. It is not limited to the form, for example, before the lifting work, using the asphalt cutter C, the pavement around the lid frame 2 is cut as shown by the broken line in FIG. It is possible to adopt a repair method that removes all of the above.
[0028]
When the lid frame 2 is raised, the pedestal 2b of the lid frame 2 is lifted, so that the pavement not only above the pedestal 2b but also the surrounding pavement is lifted together and the pavement is damaged. In order to achieve a smooth road surface, it is desirable to remove all the pavement of the lifted portion and re-pave that portion if possible. However, this recovery range tended to increase as the bulkiness increased.
[0029]
Therefore, if the pavement of the repair part is separated from the surrounding pavement in advance as described above, the range of restoration of the pavement is reduced particularly when the cover frame 2 is large in volume, so the work time of the construction is reduced. This leads to shortening and is advantageous in terms of cost. In addition, if the cutting radius of the cutter C is reduced and only the top of the neck 1 is used as a pavement removal / recovery range within this range, it is useful for simplifying the procedural aspects such as road use permission. .
[0030]
Moreover, in said embodiment, although the hydraulic jack 5 was used as the drive device 6 which raises / lowers the raising member 8 with respect to the receiving member 7, a various drive device can be used besides this embodiment. For example, as a driving machine other than the jack 5, a rack is provided in the vertical direction of the bulking member 8, a small gear meshing with the rack is provided in the receiving member 7, and the small gear is rotated by a driving machine such as a motor. The structure which raises / lowers the bulkiness member 8 along the said rack can be considered. In this case, the upper locking surface 8a can be omitted.
[0031]
Further, in the above embodiment, the pedestal receiving bolt 9 is screwed into a screw hole provided in the base of the lid frame 2, but L is supported on the outer peripheral end of the base 2 b of the lid frame 2 from the lower surface. As shown in FIG. 5, a configuration in which the base receiving bolt 9 is screwed in the vertical direction to a nut 2 d fixed to the L-shaped metal fitting 2 c can also be adopted as shown in FIG. 5. This is convenient because processing such as drilling the lid frame 2 can be omitted.
[0032]
In the existing manhole M, the shape of the flange portion 2a formed on the inner periphery of the lid frame 2 is various. However, the locking surface 8b extends from the lower portion of the hook portion 2a, and the bulky member 8 and the lid It is sufficient that the frame 2 is locked, and the frame 2 is not necessarily horizontal.
[0033]
【The invention's effect】
As described above, the present invention can work efficiently from the ground side.
[Brief description of the drawings]
FIG. 1 is a plan view showing a repair method according to an embodiment. FIG. 2 is a cross-sectional view of the embodiment. FIG. 3 is a perspective view of the embodiment. FIG. 5 is a detailed view showing how the pedestal receiving bolt according to another embodiment is used. FIG. 6 is a cross-sectional view showing a conventional repair method. FIG. 7 shows the structure of a conventional lid frame. Sectional view [FIG. 8] Cross-sectional view showing the structure of a conventional lid frame [Explanation of symbols]
1,11 Neck seats 2,12,18 Lid frame 2a collar 2b base 2c L-shaped bracket 2d nut 3 lid 4 jack hole 5 jack 5a plunger 6 drive 7 receiving member 8 bulk member 9 base receiving bolt 10 anchor bolt A Anchor part G Ground M Manhole R Liner

Claims (1)

In the repair method around the lid frame 2 in the manhole M in which the lid frame 2 is provided at the upper end of the cylindrical neck 1 rising from the underground conduit and the lid 3 is fitted to the lid frame 2,
The receiving member 7 straddling the upper surface of the neck 1 is fixed to the ground G at both ends thereof, and a raised member 8 provided on the receiving member 7 so as to be movable up and down is locked to the lid frame 2. The lid 6 is raised to a predetermined height by being raised by the driving device 6, and the lid frame 2 is fixed to the neck 1 at the position, and a repair material is placed around the lid frame 2. the packed Mel so,
The bulky member 8 has horizontal locking surfaces 8a and 8b opposite to the upper and lower ends, a jack 5 is mounted as a driving device 6 on the receiving member 7, and the jack 5 is placed on the locking surface 8a of the upper end. 5, the plunger 5 a is addressed from below, and the locking surface 8 b of the lower end is addressed and locked from the bottom of the lid frame 2, and the bulky member 8 is raised by the operation of the jack 5. a method of repairing a surrounding manhole lid frame, characterized.

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