JP2007107316A - Method of temporarily recovering pavement surface in burying work of underground buried object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of temporarily recovering a pavement surface in burying work of an underground buried object, according to which a pavement material such as asphalt mixture is not used but a temporary cover is used in execution of temporary recovery work, to thereby bring about improved cost efficiency and shortened construction hours, and achieve execution of the work without much waste because of no generation of wasted asphalt mixture when the temporary cover is removed in order to carry out permanent recovery after the temporary recovery. <P>SOLUTION: When the burying work of the underground buried object such as a gas pipe is carried out, an excavated hole 17 bored in the pavement surface 10 is backfilled and rolled, and bearing sand 27 is laid and leveled off so as to have a depth of several centimeters or more on a backfilled uppermost portion, followed by arranging the temporary cover 11 fitted into the excavated hole bored in the pavement surface, on the laid and leveled off bearing sand in a manner capable of settling independently from the pavement surface. Then vibration is applied to an upper surface of the temporary cover by means of a rolling machine, and therefore a lower surface of the temporary cover is borne by the bearing sand with an almost uniform bearing force as a whole, to thereby temporarily recover the road surface that is usable in the almost same manner as the pavement surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temporary restoration method for a paved surface in an underground construction work.

  For example, in a construction where a gas pipe is drawn from a main pipe into a residential land, provisional restoration is often performed at the time of work separation in order to secure traffic on the road where the main pipe is laid. The purpose of the temporary restoration is not only the immediate countermeasures that cannot be carried out at the same time as the completion of construction, but also until the road ground where the excavated construction hole is backfilled is almost in the same state as before the backfilling. In some cases, natural rolling of the excavation part due to vibration of a vehicle passing through the backfill part is expected. Thereby, it is possible to prevent the pavement from sinking at a later date due to insufficient rolling pressure when the restoration work is suddenly performed. The same applies to construction of water pipes and the like.

  Conventionally, the temporary restoration method that has been performed for the above-described purpose has been to backfill excavated portions and temporarily paving with asphalt mixture. In temporary restoration work using asphalt mixture, it is necessary to destroy the asphalt mixture used for temporary restoration and bring it to the recycling site when carrying out this restoration work. And so on. In addition, noise is generated during compaction and demolition work at the time of construction.

As a countermeasure, for example, there is an invention of JP-A-2002-138407, and the invention of the same issue is that durability and water resistance so that a lining board used for forming a temporary road surface during digging work can withstand long-term use. The purpose is to improve the performance. In the case of this invention, an upper layer portion having durability and water resistance is formed on the upper surface of the tatami-shaped iron plate through a nonwoven fabric infiltrated with urethane resin, and the construction hole necessary for the underground construction of the underground buried object is formed. It is considered difficult to divert to backfill.

  Japanese Patent Application Laid-Open No. 2004-52410 relates to a method for temporarily restoring an excavated road surface, and a pin is driven into a location outside the temporary roadbed material in the mat for fixing the temporary restoration mat. However, since the pin only needs to be driven into the existing pavement that is peeled off in this restoration, the supporting force is small, and in some cases, the pin may come off due to the running load of the automobile and may be scattered. Moreover, since it is necessary to lay a simulated roadbed material under the temporary restoration mat, its flatness becomes a problem, and the quality of the work is greatly influenced by the skill level of the work.

  Utility Model Registration No. 3112511 is called a road temporary restoration laying block mat, but there is no means or method for fixing the laid mat, so there is a risk that the mat may be flipped up by the running load of the automobile. is there. Further, the flatness of the backfill surface on which the block mat is spread becomes a problem, which is the same as the case of the invention relating to the temporary restoration. The inventions and ideas of the latter two are also not very useful for backfilling the construction holes necessary for the underground construction work, and are considered to have little merit.

JP 2002-138407 A JP 2004-52410 A Utility model registration No. 3112511

  In particular, none of the above-mentioned inventions and devices has taken any measures against the sinking of the temporary lid that is expected to occur during the temporary restoration. If the temporary lid is supported by the existing pavement, if the temporary lid sinks, the support pavement surface will receive a vehicle load, and there is a concern that it will be damaged. On the other hand, the purpose of expecting the rolling effect by sinking the backfill portion by the weight of the vehicle passing over the temporary lid during temporary restoration cannot be achieved.

The present invention has been made paying attention to the above points, and the problem is that it is not necessary to use a paving material such as an asphalt mixture at the time of temporary restoration, and it is economical and can be constructed in a short time. It is to provide a temporary restoration method for paved surfaces in the construction of objects. Further, another object of the present invention is to bury underground buried objects that do not generate waste materials of asphalt mixture when the temporary lid is removed at the stage of the final restoration work after the temporary restoration, so that construction without waste is possible. It is to provide a temporary restoration method for paved surfaces in construction.

  In order to solve the above-mentioned problems, the present invention is to bury the construction hole opened in the pavement surface in the underground construction work such as gas piping construction, and perform the rolling pressure, and several cm at the top of the backfill. Placing the support sand to the above depth and leveling it, placing the temporary lid that fits in the construction hole opened in the pavement surface, placing it on the support sand that has been leveled, keeping the sinkable state independent of the pavement surface, By applying vibration to the upper surface of the temporary lid using a compactor, almost the entire lower surface of the temporary lid is received by the supporting sand with a uniform supporting force so that it can be temporarily restored to a usable state like the pavement surface. It is a measure to do. In the present invention, the burying work of the underground burial means, for example, a part of the gas piping work or the waterworks, and the work of burying the underground burial that does not require maintenance after the construction and then backfilling it near the pavement surface.

  The underground construction targeted by the present invention is necessary to reduce the impact of road traffic because it mainly involves excavation of paved roads, such as gas pipe construction and water pipe construction. Is. However, not only that, in order to eliminate road ground non-uniformity caused by partial excavation and backfilling of the pavement surface, vehicle weight is added during temporary restoration, thereby reducing the time of partial backfilling. It is effective and necessary to obtain a rolling effect by allowing it to settle naturally.

  In the temporary restoration method of the pavement surface in the underground construction work of the present invention, first, the construction hole opened in the pavement surface is backfilled and rolling is performed. This compaction is the compaction of the soil constituting the road ground and the ground constituent material including gravel, and is performed using a compactor. Further, when the backfill layer is deep, backfilling is performed to a predetermined depth and rolling is performed, and further backfilling is performed and rolling is repeated. This stage is referred to as a backfill rolling process in the present invention.

  After the backfill rolling process, the supporting sand is thrown into the top of the backfilled ground component. It is desirable that the supporting sand is spread and leveled to a depth of several cm or more, more specifically 2 cm or more and 5 cm or less. Below that, due to the lack of thickness, the supporting force for receiving the temporary lid explained in the next step is not uniform across the entire surface. Conversely, when the thickness exceeds 5 cm, the supporting sand itself is tightened due to the excessive thickness. This is because the sunk greatly sinks and creates a step with the existing pavement surface around the construction hole. It is important that the supporting sand is spread to a uniform depth without unevenness to prevent rattling of the temporary lid. When the supporting sand is spread and leveled, a compactor may be used or may not be used. For this purpose, the depth of the supporting sand is verified by using an auxiliary tool commonly called a rake and the like is confirmed. This stage is referred to as a sand cushion leveling process in the present invention.

  A temporary lid is placed on the leveled support sand. The temporary lid desirably has a planar shape similar to the planar shape of the construction hole. In addition, the temporary lid has a size and shape that can fit in the construction hole and almost completely close the opening, and at the same time, it does not contact or engage with the pavement surface and can sink independently. It is important to keep it in place. Although the temporary lid is preferably a cast iron product, it is also possible to use a lightweight resin product. This stage is referred to as a temporary lid placement step in the present invention.

  It is desirable that the temporary lid used in this process has a so-called manhole iron lid or a similar structure as shown in FIGS. The lower surface of such a temporary lid is provided with a rib that becomes an engaging portion that bites into the support sand spread and smoothed in the previous process, and the upper surface has an appropriate frictional resistance against the tire of the vehicle that passes. This is because the concave and convex pattern to be provided is provided, and it exhibits a suitable effect as a temporary lid during temporary restoration. However, the shape and structure similar to the manhole iron cover is not an essential condition, and the object of the present invention can be achieved to a considerable extent even by a flat temporary cover as shown in FIG.

  In the temporary lid placement step, vibration is applied to the upper surface of the temporary lid using a compactor, so that the lower surface of the temporary lid is received by the supporting sand with a uniform supporting force. In order to obtain this uniform supporting force, it is necessary to level the supporting sand described above and to be independent of the paved surface of the temporary lid. In this way, a method in which the supporting sand on the lower surface of the temporary lid flows and the entire lower surface of the temporary lid is received with a uniform supporting force is called a sand cushion method. In the sand cushion method, rattling does not occur at the stage where the temporary lid is received by the supporting sand, and therefore other fixing means such as pins and piles are not required.

  Thus, the backfill portion of the construction hole is temporarily restored to a usable state in the same manner as the pavement surface with the temporary lid exposed on the pavement surface. Although the temporarily placed temporary lid is fixed to the pavement surface so as not to move, a slight gap is generated around the temporary lid. On the other hand, in the present invention, joint sand can be filled between the inner peripheral surface of the construction hole and the outer peripheral surface of the temporary lid, and a waterproof measure can be taken using a filler having a sealing property. As a result, it is possible to prevent flooding from the target sand portion to the backfill portion due to rain or the like, causing the backfill portion to be washed away or causing uneven settlement. A rubber seal material that expands in contact with water (hereinafter referred to as a water expansion rubber) is suitable as a filler having a sealing property, and is formed in a strip shape or a ring shape on the outer periphery of the temporary lid and the pavement surface. Fill the gap with the inner peripheral surface of the drilled construction hole. In addition, a resin material having elasticity and a sponge material composed of closed cells can be used as a filler in the method of the present invention.

  Since the present invention is configured and operates as described above, it is not necessary to use a paving material such as Alfalt at the time of temporary restoration. Therefore, the material cost and construction cost required for asphalt composite construction for the temporary restoration work. The construction time and also the construction cost and construction time required to remove the asphalt mixture used in the temporary restoration work at the time of this restoration work are no longer necessary, and no waste material of asphalt mixture is generated, so it is economical and shortens the construction period There is an effect that is possible. In addition, according to the present invention, it is possible to prevent a problem caused by intrusion of rainwater or the like by providing a sealing material around the temporary lid, and during temporary restoration, the same as in the so-called manhole iron lid Driving stability and anti-slip effect can be expected. In addition, since the temporary lid is not fixed to the pavement using pins etc., if the temporary lid sinks after temporary restoration, remove the temporary lid, lift it up, replenish the supporting sand and return the temporary lid. During the temporary restoration, the level difference between the temporary lid and the existing pavement surface generated by natural rolling can be easily corrected.

Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments.
Device Configuration FIG. 1 shows an example of a temporary lid 11 used in a method for temporarily restoring a pavement surface in an underground buried object of the present invention. This temporary lid 11 is a large circular iron lid having a diameter of φ940, which is made of ductile cast iron like an actual manhole iron lid, but weighs several tens of kg so that it can be lifted by one or two people It is assumed that it is thinner than an actual manhole cover. The temporary lid 11 has a planar shape similar to the construction hole, and has a shape and size such that a gap of 5 to 10 mm is formed around the hole diameter of the construction hole. Is filled with water-expandable rubber as described later.

  The temporary lid 11 is provided with a plurality of hand key holes 12 used for lifting or moving (FIG. 3), and a gas detection tube 31 is driven into the ground for the hand key holes 12 to gas. Make sure that there are no leaks after construction. See FIG. That is, since the gas detection tube 31 has a diameter of about 15 mm, the hand key hole 12 is provided with a slightly larger diameter. In addition, when the temporary lid 11 is formed of the same material as the manhole iron lid and the surface pattern is also expected to prevent slipping, the manhole iron lid is said to wear 0.2 mm / year. In consideration of the above, if the depth of the surface pattern 13 is set to 6 mm, the life until the depth is halved is 15 years, which is longer than the lining plate described in Patent Document 1. It will show the durability to reach.

  In addition, ribs are provided on the lower surface of the temporary lid 11 in the vertical and horizontal directions as engaging portions 14 that bite into the support sand and are fixed (FIGS. 1B and 2). The illustrated rib has a length that is about the same as the thickness of the temporary lid 11 and engages and engages the supporting sand 27 with a sufficient depth to create a fixed state. It is provided in a letter shape. This rib may be a single + shape, or may be provided in a triple or more lattice shape, and may have a negative shape, a radial shape, or any non-geometric shape. The temporary lid 11 is also provided with a hanging edge 15 on the periphery, and the hanging edge 15 surrounds the “well” -shaped engagement portion 14 and is several tens of percent deeper than that. It has become. Since the outer peripheral surface of the drooping portion 15 is composed of a sloping inclined surface, it is easy to bite into the supporting sand 27 and comes into tight engagement as it bites. This engagement action by biting can be similarly obtained for the “well” -shaped engagement portion 14 having a tapered cross-sectional shape.

  The most primitive example of the temporary lid 11 is a single plate-like one and is shown in FIGS. The temporary lid 11 in FIG. 4A has a uniform thickness, and the outer peripheral surface is also vertical and has no inclination. Such a temporary lid 11 is only in surface contact with the support sand 27 at the flat lower surface 16, but is fixed to the support sand 27 by contact with the entire surface by rolling. The temporary lid 11 of FIG. 4B has a flat lower surface 15 and an outer peripheral surface whose bottom is inclined inward, and is fixed to the supporting sand when the lower surface 16 comes into full contact by rolling.

  4C and 4D are examples of construction holes opened in the pavement surface 10. The construction hole 17 shown in FIG. 4C has a vertical cylindrical inner peripheral surface 17a, and the construction hole 18 shown in FIG. 4D has a spherical inner peripheral surface 18a centered on a point O on the pavement surface. Yes. These construction holes 17 and 18 are different depending on the excavation method, and the construction method of the present invention can be applied to both of them. In the case of the construction hole 18 having the spherical inner peripheral surface 18 a, in relation to the temporary lid 11, a gap is created around the temporary hole 11 in a state where the temporary lid 11 is disposed in the construction hole 18, and the temporary lid is independent of the pavement surface 10. It is assumed that 11 has a size and shape capable of sinking.

  FIG. 5 shows an example of an auxiliary tool 20 called a rake, which has support portions 21 and 22 that are locked on the pavement surface 10 at both ends, and a required depth d from the lower surfaces 21a and 22a. It has a first contact surface 23 with the surface of the backfill portion, which is lowered only. In addition, since the second contact surface 24 is provided at a position that is higher than the upper surfaces 21b and 22b of the support portions 21 and 22 by the required depth d ', two kinds of depths, that is, the backfill portion surface and the support sand surface. It can correspond to the test of.

Temporary restoration method for pavement surface in underground construction work according to the present invention Backfill rolling process (see Fig. 6)
In underground construction such as gas piping construction, in the case of the example shown in FIG. 6 and the following, a construction hole 18 having an opening of a spherical inner peripheral surface 18a is formed in the pavement surface 10. In order to backfill, soil components including soil, gravel, etc. are introduced. The supplied ground constituent material is compacted by using a compactor 25 (FIG. 6A). When the backfill layer 26 is deep, rolling is repeated every time a ground material of about 30 cm is introduced (FIG. 6B. The backfilling operation is finished and the surface of the same layer is at a predetermined depth position. The test is performed by applying the first contact surface 23 of the auxiliary tool 20, and the validity is confirmed (FIG. 6C).

Supporting sand leveling process (see Fig. 7)
Support sand 27 is thrown into the surface of the backfill portion 26 formed in the previous step (FIG. 7A). The supporting sand 27 is spread over the entire surface so as to have a depth of about 3 to 5 cm, and is compacted by stepping with a foot or using the compactor 25 (FIG. 7B). The position of the surface of the leveling layer of the supporting sand 27 is also confirmed by applying the second contact surface 24 of the auxiliary tool 20 (FIG. 7C). The depth d ′ of the second contact surface 24 is set in consideration of the thickness of the temporary lid 11.

Temporary lid placement process (see Fig. 8)
The temporary lid 11 is placed on the surface of the support sand 27 spread and spread in the previous step (FIG. 8A). With the provision of the temporary lid 11, the opening of the construction hole 18 is blocked except for the gap 28 between the surrounding pavement surface 10. The temporary lid 11 is rolled using a rolling machine 25 (FIG. 8B). In order to mitigate the noise generated when the compactor 25 strikes the temporary lid 11 made of cast iron, a cushioning material such as a plywood plate is used in between. By the rolling operation on the temporary lid 11, the engaging portion 14 of the lower surface 16 of the temporary lid 11 bites into and engages the surface of the support sand 27 that has been compacted, and the lower surface 16 of the temporary lid 11 covers the entire surface. It will be in the state where it was stuck and fixed to the surface of support sand 27. Further, it is confirmed that there is no step between the periphery of the temporary lid 11 and the pavement 10 (FIG. 8C).

Sealing process (see FIGS. 9 and 10)
Then, the joint sand 29 is filled and filled in the gap 28 between the peripheral portion of the temporary lid 11 and the pavement surface 10, and the joint sand 29 is rolled and placed (FIGS. 9A and 9B). Filling the joint sand 29 is repeated until the joint is completely filled. Further, in order to prevent rainwater and the like from entering through the gap 28 between the temporary lid 11 and the pavement surface 10, a waterproof measure can be taken using a filler 30 having a sealing property (FIGS. 10A and 10B). ). The illustrated filler 30 is made of water-expanded rubber having substantially the same thickness as the gap 28 between the temporary lid 11 and the pavement surface 10 and is packed in the gap 28 and then infiltrated with water by means such as watering. It is left in an expanded state. As described above, an elastic material may be packed in the gap 28 in a compressed state instead of the water expansion rubber. Thus, the temporary restoration method for the pavement surface 10 according to the present invention is completed.

Gas leak inspection (see Fig. 12)
At the stage where the temporary restoration method is completed, check whether there is any gas leak. For this purpose, a gas detection pipe 31 connected to a gas leak detection device (not shown) is driven from the hand key hole 12 to the backfill layer through the joint sand layer. If a gas leak is detected, the amount is further measured to evaluate the gas leak state, and it is determined whether or not the construction is to be repeated for the gas piping work or the temporary restoration work according to the present invention. If there is no problem, the gas detection tube 31 is extracted and the remaining holes are filled with an appropriate filler.

Main restoration process (see Fig. 11)
Although the present invention relates to a construction method for temporary restoration of a pavement surface, it also has a side surface that facilitates this restoration work after provisional restoration, so the restoration process will be briefly described. After the temporary restoration work is completed, the system waits for the natural settlement of the backfill portion 26 due to vehicle traffic. First, the temporary lid 11 is removed by inserting and locking the hand key into the hand key hole 12 (FIG. 11A), and all of the supporting sand 27 that remains on the backfill portion and forms the sand cushion layer is removed ( FIG. 11B). After that, as the pavement material 32, for example, asphalt joint is formed in a void having the backfill portion 26 as the bottom surface and the inner wall of the construction hole 18 (or 17) opened in the pavement surface 10 which is an existing road surface. This restoration is performed by filling and rolling the material.

  The temporary restoration method and the subsequent restoration method of the present invention have the above-described configuration, and the temporary lid 11 is fixed by the lower support sand 27 so that it can sink independently of the surrounding pavement surface 10. Therefore, the load received by the temporary lid 11 during the temporary restoration by the vehicle or the like does not affect the surrounding pavement surface 10 in any way. The supporting sand 27 used as the sand cushion of the temporary lid 11 can be made of a recycled material that is a reused product of, for example, molten slag generated in a garbage incineration plant.

The temporary lid | cover used for the temporary restoration method of the pavement surface in the underground construction of the underground embedment which concerns on this invention is shown, A is the top view, B is a partial expanded sectional view. The bottom view of the thing of FIG. FIGS. 3A and 3B show a hand keyhole portion, where A is a partially enlarged bottom view, B is a cross-sectional view taken along line CC in FIG. 3A, and C is a cross-sectional view taken along line DD in FIG. The side view of other temporary lids A and B applicable to this invention, and explanatory drawing which shows the cross-sectional shape of the construction holes C and D. FIG. The front view which shows an example of the auxiliary tool used for this invention. Explanatory drawing which shows the backfill rolling process A, B, and C. FIG. Explanatory drawing which shows the support sand spread leveling process A, B, and C. FIG. Explanatory drawing which shows temporary cover arrangement | positioning process A, B, and C. FIG. Explanatory drawing which shows the first half A and B of a joint sealing process. Explanatory drawing which shows the latter half A and B of a joint-sealing process. Explanatory drawing which shows this recovery process A, B, and C. FIG. Explanatory drawing which shows a gas leak test | inspection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pavement surface 11 Temporary cover 12 Hand key hole 14 Engagement part 15 Edge part 16 Lower surface of temporary cover 17, 18 Construction hole 17a, 18a Inner peripheral surface 20 Auxiliary tool 21, 22 Support part 23 1st contact surface 24 2nd contact surface Contact surface 25 Compressor 26 Backfill 27 Support sand 28 Clearance 29 Joint sand 30 Filler 31 Gas detector tube

Claims (3)

In underground construction such as gas piping construction, backfill the construction hole opened in the pavement surface, perform rolling compaction, and spread the support sand to a depth of several cm or more on the top of the backfill. The temporary lid that fits in the construction hole opened in the pavement surface is placed on the leveled support sand so that it can sink independently of the pavement surface, and the upper surface of the temporary lid is vibrated using a compactor. As a result, the bottom surface of the temporary lid is received by the supporting sand with a substantially uniform supporting force as a whole, and the pavement surface of the underground buried object is temporarily restored to a usable state in the same way as the pavement surface. Temporary restoration method. Filled with joint sand between the inner peripheral surface of the construction hole and the outer peripheral surface of the temporary lid, and further waterproofed with a filler having a sealing property between the inner peripheral surface of the construction hole and the outer peripheral surface of the temporary lid. The temporary restoration method of the pavement surface in the underground construction of the underground buried object of Claim 1 which gave the countermeasure. As the temporary lid, the lower surface is provided with a rib that becomes an engaging portion that bites into the support sand spread and smoothed in the previous process, and the upper surface has an appropriate frictional resistance against the tire of the vehicle that passes. The temporary restoration method of the pavement surface in the underground construction of the underground buried object of Claim 1 which uses what provided the uneven | corrugated pattern.

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