JP3231674U - Manhole lifting means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole elevating means which can be permanently and safely used in a manhole after repair and can be easily installed without damaging a repair liner constituting an inner wall of the manhole. SOLUTION: This is a lifting means newly installed in a manhole after repairing an inner wall of a manhole erected substantially vertically, has a ring shape, and is expanded so as to be at least larger than the inner diameter of the manhole 10. It has a fixing member 12 that is attached with a member having caliberable rigidity and a rubber member 17 interposed therebetween and an urging force applied to the inner wall of the manhole, and at least a length extending from the fixing member to the bottom of the manhole. The lower end is installed on the bottom of the manhole so that the load during ascending and descending is applied to the bottom of the manhole, and the upper portion has a ladder 14 fixed to the fixing member. [Selection diagram] FIG. 7

Description

The present invention relates to a manhole elevating means, particularly a manhole elevating means for newly installing a ladder in a manhole that has been repaired.

A manhole is a vertical hole provided on the ground so that workers can enter and exit from the ground for the purpose of inspection, management, repair, etc. of underground sewer pipes, culverts, buried telecommunications cables, etc. Is covered with a lid. At the bottom of the manhole, for example, in a manhole connecting a sewer pipe, an invert is formed so that sewage does not stay in the lower part of the manhole and flows smoothly to the sewer pipe on the downstream side. After many years of use, manholes have cracks and damage on the inner wall, and it is required to repair the inner wall on a regular basis.

FIG. 9 shows the state of the manhole before repair. The bottom portion of the invert 54 and the conduits 56, 56 connected to the manhole are shown removed. Steps (footrest hardware) 52 for workers to move up and down are buried or driven into the inner wall of the manhole 50 at predetermined intervals. Step 52 may be partially omitted after many years of use. Cracks 58 and the like can also be seen on the inner wall of the manhole 50.

The repair of the manhole 50 needs to be performed with all the steps 52 described above removed. That is, a repair material (FRP liner) is introduced into the manhole 50, and the diameter of the manhole 50 is expanded to increase the diameter of the manhole 50. This is done by a method such as making it adhere to the inner wall and hardening it.

Until now, steps and ladders for workers to move up and down in the repaired manhole have been installed by driving step metal fittings into the inner wall of the repaired manhole in order to install them stably. Was there. However, in such an installation, there is a situation where a hole is formed even though a liner for repair is installed seamlessly. In that case, problems such as sewage and rainwater invading from the hole occurred. Such defects may cause problems such as forming cavities in the ground over time. Therefore, there has been a demand for an elevating means, that is, a ladder, in which a ladder can be easily installed without damaging the repair liner.

Patent Document 1 discloses a scaffolding for work installed for temporary work in a sloped pipeline such as a penstock for hydroelectric power generation or a inverted siphon pipe for a river. The scaffolding is connected to a ladder arranged along the lower inner wall of the sloping pipeline. An annular inner band is attached to the upper and lower ends of the ladder, and the upper and lower parts of the ladder are attached and fixed to the inside of the inner band. This inner band is arranged so as to abut the inner wall of the pipeline. In the pipeline, a plurality of reinforcing jigs are provided between the ladder and the inner wall of the pipeline in the longitudinal direction of the ladder so that the ladder does not bend. That is, the lower end of the ladder is fixed to the inner band, and the load during ascending / descending is distributed and received by the inner band.

Workers use this ladder to move through sloping pipelines and use scaffolding to perform their work. When the work is done, this scaffold will be removed along with the ladder.

Japanese Patent No. 6605168

The technique disclosed in Patent Document 1 is to install a ladder in a pipeline having a slope, and the ladder is installed so as to be substantially parallel to the slope of the pipeline, so that an operator can work. It is assumed that the installation will be temporary until the completion of. The invention of the present application is installation in a manhole, and the inner wall of the manhole stands up vertically. Therefore, when the configuration of Patent Document 1 is applied, it is considered that it cannot withstand permanent use because it is fixed to the inner wall of the manhole only by the inner band to which the ladder is attached. That is, it is impossible to support the ladder only with the inner bands attached to the top and bottom of the ladder for a long period of time, and the inner band may loosen over time and slide down to the lower side of the manhole. Therefore, the ladder disclosed in Patent Document 1 cannot be used permanently and safely in a manhole.

The present invention has been made in view of the above problems, and its purpose is to be able to be used permanently and safely in the manhole after repair, and to be easily installed without damaging the repair liner constituting the inner wall of the manhole. The purpose is to provide a means for raising and lowering a manhole.

In order to achieve the above object, the manhole elevating means according to claim 1 is
It is an elevating means newly installed in the manhole after repairing the inner wall of the manhole that is erected almost vertically.
A fixing member having a ring shape, which can be expanded in diameter so as to be at least larger than the inner diameter of the manhole, and which is attached with an urging force applied to the inner wall of the manhole by expanding the diameter of the fixing member. The lower end has a length extending from at least the fixing member to the bottom of the manhole, and the lower end is installed on the bottom of the manhole so that a load during ascending and descending is applied to the bottom of the manhole, and the upper portion is fixed to the fixing member. It is characterized by having a ladder.

With this configuration, the ring-shaped fixing member to which the upper part of the ladder is attached and fixed is expanded in diameter to the inner wall after repair at the upper position of the manhole, that is, the inner wall surface of the installed liner, and urging force is added. Is fixed. That is, the fixing member is closely installed on the inner wall surface of the liner. Since the lower end of the ladder is installed at the bottom of the manhole, the load applied to the ladder during ascending / descending is firmly received at the bottom of the manhole. Therefore, it is sufficient to restrict the movement of the upper part of the ladder only in the inclination direction, and stable setting is possible by attaching it to a rigid fixing member. That is, the load applied to the attached ladder firmly regulates the movement in the direction away from the inner wall of the liner. Therefore, the ladder can be installed easily and firmly without damaging the inner wall of the liner after repair, and a stable installation state can be maintained for a long period of time.

The manhole elevating means according to claim 2 is the manhole elevating means according to claim 1.
A cushioning member is arranged between the fixing member and the inner wall of the manhole.

With this configuration, vibrations and impacts generated on the ladder during ascending and descending are absorbed by this cushioning member, so that not only the stability of the ladder mounting state but also the stability of the work of the operator during ascending and descending is ensured.

The manhole elevating means according to claim 3 is the manhole elevating means according to claim 2.
The cushioning member is characterized by being composed of a belt-shaped rubber member interposed between the inner wall of the manhole and the ring-shaped fixing member over the entire circumference.

According to this, the cushioning member can be easily and inexpensively constructed, and in addition to the operation of claim 2, it is possible to accurately suppress the positional deviation after the fixing member is attached.

According to the manhole elevating means of the present invention, a rigid ring-shaped fixing member is attached in the manhole after repair by expanding the diameter, and the ladder is installed with the lower end installed at the bottom of the manhole. Since the upper part is fixed to the fixing member, the load on the ladder is accurately received at the bottom of the manhole, and the movement in the direction away from the inner wall of the manhole is firmly suppressed. Further, since the lifting means is attached not to the manhole inner wall itself but to the fixing member, the rehabilitating material for repairing the repaired manhole inner wall is not damaged. Therefore, long-term stable installation of the ladder is achieved without deteriorating the waterproof performance of the manhole.

It is a flow chart of the installation method of the manhole elevating means of this invention. It is explanatory drawing of the attachment state of the fixing member concerning the manhole elevating means of this invention. It is a detailed view of the diameter-expanded part of a fixing member. It is a detailed view of one end portion of the member which constitutes a fixing member. FIG. 4 (a) is a front view, and FIG. 4 (b) is a top view. It is a detailed view of the other end of the member constituting a fixing member. 5 (a) is a front view and FIG. 5 (b) is a top view. Other embodiments of the fixing member are shown. It is the schematic perspective view of the manhole which concerns on the manhole elevating means of this invention, and has completed the attachment of the ladder. It is a partial cross-sectional schematic side view of the manhole which is related to the manhole elevating means of this invention, and the ladder is attached. It is a partial cross-sectional schematic side view of a manhole that needs repair.

Hereinafter, embodiments of the manhole elevating means of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a flow chart of a method of installing the manhole elevating means of the present invention. For the manhole, for example, it is assumed that the repairing FRP liner is adhered to the inner wall of the manhole and hardened by the liner method, and the repair is completed.

In the flow of the installation method, first, the fixing member for fixing the upper part of the ladder is expanded and fixed at a predetermined height position on the upper part of the manhole where the repair has been completed (ring member attaching step: step S10). This fixing member has a ring shape and has a rigidity that allows the diameter to be expanded so as to be at least larger than the inner diameter of the manhole. Next, the ladder to be installed in the manhole is carried into the manhole (ladder carrying step: step S11). The ladder extends from the fixing member to the bottom of the manhole but has a length. Next, the lower end of the ladder is installed on the bottom of the manhole so that the load during ascending and descending is applied to the bottom of the manhole (ladder lower end installation step: step S12). Finally, the upper part of the ladder is fixed to the fixing member (ladder upper part fixing step: step S13). Hereinafter, the fixing member and each flow will be described.

FIG. 2 shows a state in which the fixing member is expanded and fixed on the upper part of the manhole. FIG. 3 is a detailed view of the enlarged diameter portion of the fixing member, FIG. 4 is a detailed view of one end of the member constituting the fixing member, and FIG. 5 is the other end of the member constituting the fixing member. A detailed view of the part is shown.

The fixing member 12 is composed of two flat plate-shaped constituent members 18, and the ends thereof can be combined and fixed by screwing. Two adjusting holes 26 and screw holes 28, 28 for fixing reaction force pieces are formed at one end of the component 18, respectively. Two bolt screws inserted into the adjusting hole 26 at one end of another member 18 at the other end of the component 18 to fix the component 18 and the component 18 in a predetermined diameter-expanded state. 20 are provided so as to project from each other. The adjustable diameter of the fixing member 12 is determined by the length of the adjusting hole 26 of the constituent member 18 in the longitudinal direction. Further, screw holes 22 and 22 for fixing the reaction force piece are formed at the other end of the constituent member 18.

The reaction force pieces 32 and 32 attached to the component 18 are fixed to the reaction force piece fixing screw holes 28, 28 and 22 and 22 by two bolts 30 and 30, respectively. The diameter of the fixing ring member 12 can be adjusted by using the reaction force piece 32. When the reaction force pieces 32, 32 are widened in the direction of the arrow R shown in FIG. 3, the diameter of the fixing member 12 is widened.

In this embodiment, there are two portions where the diameter can be adjusted. That is, the adjusting holes 26, 26 are provided at the end of the member 18, and the bolt screws 20 and 20 at the other end of the other component 18 are screwed into the adjusting holes 26, 26. When the fixing member 12 in which the two constituent members 18 are combined is attached to the manhole, the nuts 27 and 27 are screwed into the bolt screws 20 and 20 and tightened at a place where the diameter of one can be adjusted, and the other. Where the diameter can be adjusted, the nuts 27 and 27 and the bolt screws 20 and 20 are screwed together and loosely tightened so that the diameter can be adjusted.

The fixing ring member 12 is provided with ladder mounting portions 13 and 13 capable of mounting and fixing the ladder by welding to, for example, one or the other member 18. The ladder fits between the ladder mounting portions 13 and 13 and is fixed from the outside by, for example, a bolt.

FIG. 6 shows another embodiment of the fixing member. The fixing member is composed of two flat plate-shaped constituent members 42, 42, and folded portions 44, 44 are formed at the respective ends. A ring-shaped fixing member is formed by aligning the two constituent members 42, 42 in a ring shape and fastening the ends with bolts 46, 48. One bolt is configured so that the two members approach each other when rotated clockwise, and the other bolt is configured so that the two members separate when rotated clockwise. The diameter of the ring can be adjusted by these two bolts. The ladder mounting portion is not shown.

The fixing member attaching step (step S10) will be described. First, the two constituent members 18 are carried into the manhole 10. Next, the ends of the two constituent members 18 are combined, and the reaction force piece 32 is attached by the bolt 30. When combined, the bolt screws 20 and 20 of one constituent member 18 are fitted into the adjusting holes 26 and 26 of the other constituent member 18 and the nut 27 is screwed, but the diameter is adjusted in one place. Thus, in one adjustable location, the bolt screws 20, 20 and nuts 27, 27 are screwed together to tighten them, and in the other adjustable location, the bolt screws 20, 20 and nuts 27, 27 are screwed together. And tighten it loosely. In this state, the two members 18 are combined into a ring shape, which is at least smaller than the inner diameter of the manhole, but is in a state where the diameter can be expanded. The above work may be performed outside the manhole, and the combined product may be carried into the manhole.

Next, the ring-shaped fixing member 12 is aligned with the mounting position of the upper part of the manhole, and the rubber member 17 as a cushioning member is sandwiched between the fixing ring member 12 and the inner wall of the manhole 10, and the reaction force piece 32 Is moved in the direction of the arrow R, the inner wall of the manhole 10 and the rubber member 17 and the fixing ring member 12 are brought into close contact with each other without gaps, and the nuts 27 and 27 screwed into the bolt screws 20 and 20 are tightened. Then, the fixing ring member 12 is fixed to the inner wall of the manhole 10 in the expanded state, that is, while applying an urging force to the inner wall of the manhole 10.

The rubber member 17 as a cushioning member is intervened and installed between the inner wall of the manhole 10 over the entire circumference of the ring-shaped fixing member 12, and the vibration and impact generated on the ladder during ascending and descending are absorbed by the rubber member 17. Therefore, not only the stability of the ladder mounting state but also the stability of the worker's work when ascending and descending is ensured. Further, the rubber member 17 makes it possible to easily and inexpensively construct the cushioning member, and it is possible to accurately suppress the positional deviation after the fixing member 12 is attached.

After the fixing member 12 is expanded in diameter to the upper part of the manhole and fixed, the ladder 14 is carried into the manhole 10 (ladder carrying step: step S11). Then, the lower end of the ladder 14 is installed on the invert (bottom) 16 of the manhole 10 so that the load at the time of ascending and descending is applied to the invert (bottom) 16 of the manhole 10 (ladder lower end installation step: step S12).

Next, the upper part of the ladder 14 is fixed to the ladder attachment portion 13 of the fixing member 12 (ladder upper part fixing step: step S13). As described above, the ladder 14 is fitted between the ladder mounting portions 13 and 13 and fixed by bolts from the outside.

FIG. 7 is a schematic perspective view seen from the upper part of the manhole 10 after the installation of the ladder 14 is completed, and FIG. 8 shows a partial cross-sectional schematic side view of the manhole 10. The fixing member 12 is fixed by expanding the diameter from above the repair liner at a predetermined upper height position of the manhole 10. A rubber member 17 is mounted between the fixing member 12 and the inner diameter of the manhole 10.

The lower end of the ladder 14 is installed on the invert 16, and in the present embodiment, the lower end of the ladder 14 is fixed by a bolt 15 for further stability.

As a result, the attached ladder 40 is firmly fixed and held in a situation where the attached ladder 40 tends to move away from the inner wall of the manhole 10 due to the applied load. Further, since the lower part of the ladder 40 is attached to the bottom of the manhole 10, a very stable attachment state is ensured. Therefore, the ladder 40 can be easily and firmly installed without damaging the repair liner, and a stable installation state can be maintained for a long period of time.

According to the manhole elevating means of the present embodiment, a rigid ring-shaped fixing member is attached in the manhole after repair by expanding the diameter, and the ladder is installed with the lower end installed at the bottom of the manhole. Since the upper part is fixed to the fixing member, the load on the ladder is accurately received at the bottom of the manhole and the movement in the direction away from the inner wall of the manhole is firmly suppressed. Further, since the lifting means is attached not to the manhole inner wall itself but to the fixing member, the rehabilitating material for repairing the repaired manhole inner wall is not damaged. Therefore, long-term stable installation of the ladder is achieved without deteriorating the waterproof performance of the manhole.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, although the fixing member 12 is composed of two members, it may be composed of one member. Further, although the lower end of the ladder 14 is fixed by the bolt 15, if safety can be ensured, the lower end of the ladder 14 may be installed at the bottom of the manhole 10 without fixing the bolt.

Further, the fixing member is fixed to the inner wall of the manhole in an expanded state and a ladder is attached, but after attaching the ladder, the urging force on the inner wall of the manhole may be released. That is, even if there is no urging force on the inner wall of the manhole, since the ladder 14 is attached, the fixing member 12 does not move and the ladder 14 does not fall.

10 Manhole that has been repaired 12 Fixing member 13 Ladder mounting part 14 Ladder (elevating means)
15 Bolt 17 Rubber member (buffer member)
18, 42 Components 20 Bolt screws 22, 28 Reaction force piece fixing screw holes 26 Adjustment holes 27 Nuts 30 Bolts 44 Folded parts 32 Reaction force pieces 50 Manholes that need repair 52 Steps (footrest hardware)
54 Invert (bottom)
56 Sewer pipe mounting hole 58 Crack

Claims (3)

It is an elevating means newly installed in the manhole after repairing the inner wall of the manhole that is erected almost vertically.
A fixing member having a ring shape, which can be expanded in diameter so as to be at least larger than the inner diameter of the manhole, and which is attached with a biasing force applied to the inner wall of the manhole by expanding the diameter of the fixing member. ,
A ladder having at least a length extending from the fixing member to the bottom of the manhole, the lower end is installed on the bottom of the manhole so that a load during ascending and descending is applied to the bottom of the manhole, and the upper portion is fixed to the fixing member. And, a manhole elevating means characterized by having. The manhole elevating means according to claim 1, wherein a cushioning member is arranged between the fixing member and the inner wall of the manhole. The manhole according to claim 2, wherein the cushioning member is composed of a belt-shaped rubber member interposed between the manhole and the inner wall of the manhole over the entire circumference of the ring-shaped fixing member. Lifting means.

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