JP6695611B2 - Solid splitting dismantling method using expansion tube and bridge reinforced concrete slab dismantling removal method - Google Patents

Description

  The present invention relates to a method for dismantling a solid such as an existing concrete structure or a rock mass using an expansion tube, and more particularly to a method for dismantling and removing a reinforced concrete floor slab of a bridge using an expansion tube.

  As a conventional construction method related to the splitting and dismantling construction method of such an existing concrete structure, Patent Document 1 discloses a method for cutting a pier 1 which is a reinforced concrete structure, in which the pier 1 Before the load on the cutting upper part of the cutting tool is applied to the wire saw 2, the cutting gap holding means for holding the height of the cutting gap S constant above or below the cutting gap S formed in the pier 1 or across the cutting gap S. There is disclosed a horizontal cutting method for a reinforced concrete structure in which a thin hydraulic jack 30 is installed, and the hydraulic jack 30 is jacked up by counteracting the load on the cutting upper part by fluid pressure (claim of patent document 1). Claims 1 and 7, paragraph [0022] of the description, FIG. 9 of the drawings, etc.).

  However, in the horizontal cutting method of the reinforced concrete structure described in Patent Document 1, although the hydraulic pressure is used, the cutting itself of the concrete structure is performed by the wire saw 2. However, there are problems that dust and the like are scattered by cutting concrete, polluting the surrounding environment where the bridge is located, and causing complaints from neighboring residents. In addition, a concrete structure containing hard gravel (coarse aggregate) is rubbed with a harder material to be scraped off and cut, and there is also a problem that a great amount of energy is consumed for cutting and dismantling.

  Further, in the reinforced concrete floor slab of a bridge, the steel girder and the concrete floor slab are integrated with a synthetic member such as a headed stud dowel or a welded slab anchor welded on the upper surface of the steel girder. For this reason, in the conventional method of dismantling and removing reinforced concrete floor slabs for bridges, the floor slab portion located on the upper surface of the flange of the steel girder (hereinafter referred to as the girder portion) is left and the concrete portion Was crushed or cut, and the reinforced concrete floor slab was divided into blocks of a size that could be lifted by a lifting device and then removed, after which the concrete on the girder was scraped off with a breaker or pick and removed. (See also paragraph [0005] of the specification of Patent Document 2, FIG. 5 of the drawings, etc.).

  However, in such a conventional method of dismantling and removing reinforced concrete floor slabs for bridges, the tip of the breaker comes into contact with the upper surface of the flange of the steel girder when the girder part is scraped off with a breaker, etc. There is a problem that a large noise is generated by being amplified by a member having a wide area such as a web.

  Then, in order to solve such a problem, in Patent Document 2, the web 6 of the steel girder 4 in the existing floor slab 1 at the position to be replaced is cut in the vertical direction along the bridge axis direction, and the existing floor slab is cut. 1 is removed together with the upper web 9b of the steel girder 4, and a separately manufactured new floor slab 20 of the same shape and size as the existing floor slab 1 is placed on the lower web 9a of the existing steel girder, A method for replacing a bridge concrete floor slab that integrally joins the lower web 9a and the steel girder upper web 29 of the new floor slab 20 is disclosed (claim 1 of the scope of claims of patent document 2; Paragraphs [0022]-[0031], see Figures 2, 4 etc. of the drawings).

  However, the bridge concrete slab replacement construction method described in Patent Document 2 can replace the concrete slab in a short time, but requires an ultra-large crane that can lift the concrete slab with the upper half of the steel girder. Therefore, the leasing cost increases. In addition, there is a problem that the bridge concrete floor slab replacement construction method described in Patent Document 3 cannot be adopted at a site where an assembly yard for assembling a super-large crane that cannot travel on a general road cannot be secured.

  Further, in the bridge concrete floor slab replacement construction method described in Patent Document 2, there is a problem that it takes time and effort to form a predetermined suspension hole 3 so as to withstand the load of the steel girder half which is a heavy object and the floor slab. there were. Moreover, since the steel girder under the floor slab must be cut, there is a risk that sparks and part of the melted steel girder may fall, and work scaffolds should be provided over the entire bridge to be removed. There is also a problem that the temporary scaffold installation work becomes enormous and the temporary construction cost increases.

  Further, in Patent Document 3, for the purpose of providing a dismantling method capable of efficiently dismantling a concrete member locally, one core hole 3 is bored in a planned dismantling region 1 of a reinforced concrete member 10. The free surface 13 is formed, and a hydraulic crusher 15 is installed in the crushing hole 5 formed around the free surface 13 to apply pressure in the direction of the free surface 13 to connect the free surface 13 and the crushing hole 5. By breaking the concrete at 9 and extruding it in the direction of the free surface 13, a new free surface 13 is formed and a crushing hole 5 is bored around the new free surface 13. By applying pressure in the direction, the concrete is divided at the dividing plane 9 that connects the free surface 13 and the crushing hole 5, and the concrete is extruded in the direction of the free surface 13 to form a new free surface 13, thereby repeating the planned dismantling area. A concrete member dismantling method for dismantling No. 1 is disclosed (refer to claim 1 of Patent Document 3, paragraphs [0020] to [0037] in the description, and FIGS. 1 to 5 of the drawings, etc. ).

  However, in the dismantling method described in Patent Document 3, a hydraulic crusher 15 or the like is installed on the concrete member to be dismantled, and a worker works the core hole 3 or the like on the concrete member to be dismantled similarly. Above all, it is necessary to push the free surface 13 little by little with the crusher 15 while taking care so that the concrete member does not collapse, and gradually dismantle locally. This is not only dangerous for the work itself, but also takes time for dismantling work, resulting in high labor costs and high dismantling costs.

JP, 2003-74196, A JP, 2007-239365, A JP, 2014-152504, A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose thereof is to reduce the risk of noise and vibration and environmental pollution, and to dismantle safely and in a short time. It is intended to provide a solid splitting dismantling method using an expansion tube and a dismantling removing method of a reinforced concrete floor slab of a bridge that can reduce dismantling costs.

The solid splitting dismantling method using an expansion tube according to claim 1 is a solid splitting dismantling method for splitting and breaking up an existing solid such as an existing concrete structure or a rock mass into small pieces and breaking the existing solid. A core removal step of drilling a plurality of core holes at predetermined intervals along a fracture line that is split and an expansion tube that expands when a fluid is press-fitted into each core hole of the plurality of core holes. Expansion tube inserting step of inserting and expanding the expansion tube inserted into the plurality of core holes by injecting fluid into the expansion tube, and expanding the existing solid along the breaking line. And the cross-sectional shape of the expansion pipe before the expansion into which the fluid is press-fitted is a shape having a recessed part that is folded inward, and the cross-sectional shape after the expansion of the fluid into which the fluid is press-fitted. Is a substantially circular recess type expansion tube, and in the expansion tube inserting step, the recesses are oriented in the same direction along the fracture line, or the recesses are in opposite directions along the fracture line. to face, and wherein interposed to Rukoto the recess expander tube into the core hole.

  The solid splitting dismantling method using the expansion tube according to claim 2 is the solid splitting dismantling method using the expansion tube according to claim 1, wherein in the expansion tube expanding step, the solid splitting dismantling method is used. It is characterized in that the fluid is press-fitted into the plurality of installed expansion tubes at substantially the same time to expand the fluid.

A method for dismantling and removing a reinforced concrete floor slab for a bridge using an expansion tube according to claim 3 is for dismantling and removing a reinforced concrete floor slab for a bridge including a steel girder and a reinforced concrete floor slab that is fixedly integrated with the steel girder. A method for dismantling a reinforced concrete floor slab of a bridge, in the girder portion of the reinforced concrete floor slab that is above the steel girder, along a girder break line that divides and breaks this girder portion, at predetermined intervals. The core removal process of drilling multiple core holes and the cross-sectional shape before expansion when the fluid is press-fitted is a shape with a concave part that is folded inward, and after the expansion when the fluid is press-fitted. The cross-sectional shape of the recessed type expansion pipe having a substantially circular shape, the recesses are oriented in the same direction along the girder break line, or the recesses are oriented in opposite directions along the girder break line. As described above , in parallel with the expansion tube inserting step of inserting the recessed type expansion tube into each core hole of the plurality of core holes, the core removing step and the expansion tube inserting step, or the expansion tube inserting step. After the end, except for the girder portion, a floor slab breakage removal step of breaking and removing the reinforced concrete floor slab, and after the floor slab breakage removal step, the plurality of recessed expansion tubes inserted into the plurality of core holes And an expansion tube expanding step of splitting the girder portion along the girder break line.

The method of dismantling and removing a reinforced concrete floor slab of a bridge using the expansion pipe according to claim 4 is the method of dismantling and removing the reinforced concrete floor slab of a bridge according to claim 3 , wherein the expansion pipe is used in the floor slab breaking and removing step. Is used to split the reinforced concrete floor slab, and the exposed reinforcing bars are blown out from the generated cracks to break and remove the reinforced concrete floor slab.

According to the invention described in claims 1 to 4 , the fluid is press-fitted into the expansion pipe to expand it, and the existing solid is split and dismantled. Therefore, the existing solid is split while adjusting the pressure of the fluid pressed into the expansion pipe. Can be generated, and there is little risk of noise. In addition, since only a fluid such as water is used, even if the fluid leaks out, there is little risk of contaminating the surrounding environment like a static crushing agent. In addition, compared to cutting with a wire saw or diamond cutter, it is not only environmentally friendly without generating dust etc., but also has a weaker tensile strength than compressive strength, such as concrete structures, rocks, and bricks. Since it can be disassembled by cleaving a solid from the inside, it has good energy efficiency and is also environmentally friendly. In addition, the worker is less likely to be injured by being caught in the wire saw or the diamond cutter, and the existing solid can be disassembled safely and in a short time.
Further, according to the invention described in claims 1 to 4, since it is disassembled by using the recess type expansion tube having a small cross-sectional diameter before expansion, the diameter of the core hole drilled in the core removing step may be small, The extraction process can be shortened, and the existing solid can be disassembled more safely and in a shorter time, and the disassembly cost can be reduced.

  In particular, according to the invention described in claim 2, since the fluid is press-fitted into the plurality of expansion tubes inserted in the plurality of core holes at substantially the same time to expand, the existing solid is split at a stretch along the break line. It can be divided. Furthermore, the existing solid can be disassembled safely in a short time, and the disassembly cost can be reduced.

According to the inventions of claims 3 and 4 , the girder portion of the reinforced concrete floor slab of the bridge is a factor that causes a large noise when disassembling with a breaker or a pick because the stud dowels and the like are provided. Since the fluid is pressed into the expansion pipe to expand it and split it from the inside of the concrete to dismantle it, the reinforced concrete floor slab can be split while adjusting the pressure of the fluid that is pressed into the expansion pipe, which causes noise. There is no fear. Moreover, since only a fluid such as water is used, even if the fluid leaks out, there is little possibility of contaminating the surrounding environment like a static crushing agent. In addition, compared to cutting with a wire saw or diamond cutter, it does not generate dust etc. and is not only environmentally friendly, but also the floor slab made of concrete whose tensile strength is much lower than compressive strength Since it can be split and dismantled with, it is energy efficient and is also environmentally friendly in that respect. In addition, there is less risk of an operator being injured by being caught in the wire saw or the diamond cutter, and the floor slab can be disassembled safely and in a short time.

In particular, according to the invention as set forth in claim 4 , further, since it is not necessary to cut it by using a wire saw or a diamond cutter, dust is not generated and it is environmentally friendly. In addition, since the floor slab made of concrete, which has a much lower tensile strength than the compressive strength, can be disassembled by splitting it from the inside, it is energy efficient and environmentally friendly in that respect as well. Further, there is little risk of an operator being injured by being caught in the wire saw or the diamond cutter, and the floor slab can be disassembled safely and in a short time.

It is a perspective view showing a concave type expansion tube according to the first embodiment used in the present invention. It is a front view which shows a recessed type expansion tube same as the above. It is an AA line enlarged end view which shows the cross-sectional shape of the expansion tube main body of a recessed type expansion tube same as the above. It is a BB line expanded sectional view which shows the joint structure of the expansion tube main body of a recessed type expansion tube and a sealing sleeve same as the above. It is a CC line expanded sectional view which mainly shows the cross-sectional shape of the injection sleeve of the recessed type expansion tube same as the above. It is a DD line expanded sectional view mainly showing the joint structure of the expansion tube main body of the recessed type expansion tube and the injection sleeve. It is process explanatory drawing which shows the core removal process of the solid splitting disassembly method which concerns on embodiment of this invention with a perspective view. It is a process explanatory view which shows the expansion pipe installation process of the same split-disassembly dismantling method with a plan view. It is a process explanatory view showing the expansion pipe expansion process of the above-mentioned solid splitting dismantling method with a plan view. It is an expansion process explanatory drawing which shows the expansion process of the expansion pipe main body in an expansion pipe expansion process same as the above with a sectional view. It is a top view which represented typically the experimental result about the directionality of a crack. It is a perspective view which shows the bridge dismantled and removed by the dismantling removal method of the reinforced concrete floor slab of the bridge which concerns on embodiment of this invention. It is sectional drawing of the bridge same as the above. It is process explanatory drawing which shows the core removal process of the disassembly removal construction method of the reinforced concrete floor slab of the bridge which concerns on embodiment of this invention by the partial expansion perspective view of a girder part. It is process explanatory drawing which shows the core removal process same as the above with the front view seen horizontally along the bridge axis direction. It is a process explanatory drawing which shows the expansion pipe insertion process of the dismantling removal construction method of the reinforced concrete floor slab of a bridge same as the above with a partially expanded plan view of a girder part. It is process explanatory drawing which shows the floor slab fracture removal process of the dismantlement removal method of the reinforced concrete floor slab of the bridge same as the above with a perspective view. It is a process explanatory view showing the front slab breaking removal process same as the above in a horizontal view seen along the bridge axis direction. It is a process explanatory drawing which shows the expansion pipe expansion process of the dismantling removal construction method of the reinforced concrete floor slab of a bridge same as the above with the partial expansion top view of a girder part.

  Hereinafter, an embodiment for carrying out the solid splitting dismantling method and the dismantling removing method of a reinforced concrete composite floor slab of a bridge according to the present invention will be described in detail with reference to the drawings.

<Expansion tube>
First, an expansion pipe used for a solid split dismantling method and a bridge reinforced concrete floor slab dismantling method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

  First, with reference to FIG. 1 to FIG. 6, regarding a recessed type expansion tube 1 which is an expansion tube according to an embodiment used for a solid splitting dismantling method and a reinforced concrete floor slab dismantling removal method according to an embodiment of the present invention. explain.

<Expansion tube>
As shown in FIG. 1 and FIG. 2, a recess type expansion tube 1 according to an embodiment of the present invention includes an expansion tube body 2 made of a deformed steel tube and a seal for sealing an end opening at one end of the expansion tube body 2. It is composed of a stop sleeve 3 and an injection sleeve 4 fitted to the other end of the expansion tube body 2, and has a function of expanding the expansion tube body 2 by high-pressure water supplied from the injection sleeve 4.

(Expansion tube body)
The expansion pipe body 2 is flatly pressed after the base pipe of the general steel pipe is once expanded, and as shown in FIG. 3, a recess 2a is formed by roll forming or the like in which a part of the steel pipe is folded inward. Made of deformed steel pipe. The outer diameter of this deformed steel pipe is smaller than the outer diameter of the raw pipe. Further, as the raw pipe, since it is required to have a deformability capable of being expanded, pressed and roll-formed and not bursting at the time of high-pressure expansion, it is not a high-strength steel pipe having a high carbon content and brittleness, and an elongation of about 40%. A steel pipe having a tensile strength of 400 N / mm ² grade having a deformability is suitable.

(Sealing sleeve)
As shown in FIG. 4, the sealing sleeve 3 has an end portion mainly composed of a short tubular cylindrical steel pipe having an inner diameter substantially the same as the outer diameter of the pipe end of the deformed steel pipe of the expansion pipe body 2. It is a closed sleeve. Further, the sealing sleeve 3 is externally fitted to the tip of the expansion tube body 2, and the tube end of the expansion tube body 2 is welded in that state, so that the expansion tube body is kept watertight even at high pressure. It has a function of sealing the tube end of No. 2.

  Of course, the joining of the sealing sleeve 3 and the expansion tube main body 2 is not limited to welding joining, and if the tube end of the expansion tube main body 2 can be sealed so as to maintain the watertightness even under high pressure, the sealing is performed. It may be joined by another joining method such as press-fitting a separate sealing metal fitting on the tube end of the sleeve.

(Injection sleeve)
As shown in FIGS. 5 and 6, the injection sleeve 4 is mainly composed of a short tubular cylindrical steel pipe having an inner diameter substantially the same as the outer diameter of the pipe end of the deformed steel pipe of the expansion pipe body 2. ..

  As shown in FIG. 6, the injection sleeve 4 has a rear end of the expansion tube main body 2 welded to the inner peripheral surface thereof so as to close the tube end of the expansion tube main body 2 so as to maintain watertightness even under high pressure. Is configured. Further, as shown in FIGS. 5 and 6, the injection sleeve 4 has an injection port 4a which is welded to the inner peripheral surface thereof and penetrates to the expansion tube main body 2 and which is connected to the injection port 4a. High-pressure water can be injected into the expansion pipe body 2 from the injection sleeve 4 via a high-water pressure supply unit WU described later.

  Of course, the injection sleeve 4 may be configured to be capable of injecting high-pressure water and maintaining water-tightness even under high pressure, and a separate metal fitting may be used to join the injection sleeve 4 and the tube end of the expansion tube body 2 together. It does not matter even if it is joined through.

Since the sealing sleeve 3 and the injection sleeve 4 are not required to have the same deformability as the expansion tube body 2, a steel pipe having a tensile strength of 400 N / mm ² equivalent to that of the expansion tube body ² or more. It should be composed of.

  According to such a recess type expansion tube 1, since it has been previously expanded and then formed into a recess having a recess 2a by press molding, roll molding or the like, the expansion amount at the time of press-fitting high pressure water is increased. In addition to being excellent in deformability, the possibility of bursting during expansion is extremely low.

  Further, the outer diameter (diameter) of the sealing sleeve 3 and the injection sleeve 4 is 40 mm or less, and the outer diameter of the folded expansion tube body 2 is about 36 mm. Therefore, the recessed expansion tube 1 has a diameter of 40 mm. It can be inserted into the small diameter hole.

<Solid cleaving method>
Next, a solid splitting dismantling method according to the embodiment of the present invention using the recessed expansion tube 1 according to the above-described embodiment will be described with reference to FIGS. 7 to 11. Solid splitting dismantling method according to the present embodiment, existing bridges, tunnels, existing concrete structures such as buildings, rock blocks that obstruct in civil engineering construction law, or bricks, tensile strength compared to compressive strength Although it can be suitably applied to a low existing solid, a rectangular solid unreinforced concrete mass C having a rectangular cross section will be described as an example of the existing solid.

(1) Core removal step First, in the solid splitting and demolishing method according to the present embodiment, as shown in FIG. 7, a breaking line L of a concrete block C to be split and broken is set, and a predetermined interval is set along the breaking line L. A core removing step is performed in which a plurality of core holes H are drilled. Specifically, the breaking line L is marked (positioned) on the concrete block C, the center position of the core hole H is marked at a predetermined interval, and a core removing device such as a core drill is set according to the marking. After that, the core removing device is operated to drill the core hole H having a predetermined depth according to the length of the recessed expansion tube 1.

  The interval between the core holes H may be appropriately determined by previously confirming the range in which one expansion tube can be cleaved by experiments or the like according to the type of solid to be broken and disassembled. An experiment was conducted assuming that the unreinforced concrete block C would be split by the above-mentioned recessed type expansion tube 1, and it became clear that splitting would occur at intervals of about 40 cm.

(2) Expansion Tube Inserting Step Next, in the solid splitting and dismantling method according to the present embodiment, as shown in FIG. 8, each core hole H of the plurality of core holes drilled in the previous step has An expansion tube inserting step of inserting the expansion tube 1 is performed. Specifically, as shown by the arrows in FIG. 8, the recessed expansion tubes 1 of the recessed expansion tubes 1 are arranged so that the groove directions of the recesses 2a of the expansion tube body 2 coincide with each other along the fracture line L. The recess type expansion tubes 1 are inserted into the core holes H such that the groove directions of the recesses 2a face the same direction or the opposite directions.

  Then, as shown in FIG. 8, a high water pressure supply unit WU, which is a high pressure water generator that is connected to all of the plurality of recessed expansion tubes 1 inserted in each core hole H via a pressure adapter CA, is set. The high pressure water can be simultaneously supplied to all of the plurality of recess type expansion tubes 1. The high water pressure supply unit WU according to the present embodiment is a high-pressure water generator of an air boosting system, and has an air pressure of 0.5 to 0.8 MPa, a generated water pressure of 25 to 30 MPa (maximum 50 MPa), and a pressure boosting ratio (air 1: It has a capacity of water 65) and a discharge rate of 9 L / min.

  Of course, the fluid to be injected into the expansion tube is not limited to water, and high-pressure oil may be injected through a conventional hydraulic device instead of the high-pressure water generator. However, if the high-pressure water generator is used to inject high-pressure water, not only a large amount of fluid can be obtained at low cost, but in the unlikely event that fluid leaks from the expansion pipe or fluid that remains in the expansion pipe is removed. Even if it is left unattended, there is no risk of adversely affecting the surrounding environment, which is preferable.

(3) Expansion Tube Expansion Step Next, in the solid splitting and dismantling method according to the present embodiment, as shown in FIG. 9, a high water pressure is applied to the plurality of recess type expansion tubes 1 inserted in the plurality of core holes H. An expansion pipe expansion step is performed in which water is press-fitted through the supply unit WU to expand the recessed expansion pipe 1 and to split the concrete block C along the fracture line L. Specifically, the high water pressure supply unit WU is operated to simultaneously inject and fill water in each recess type expansion pipe 1 via the pressurizing adapter CA, and the recess type expansion pipe 1 is caused to flow by the water pressure as shown in FIG. By inflating the concrete lump C and applying pressure from the inside to the concrete lump C, a tensile stress is applied to the concrete lump C, the concrete lump C is split along the fracture line L, and the concrete lump C is divided into any size that is easy to carry out. You can

Here, the physical properties of concrete are, as expressed by the formula of tensile strength: f _tk = f ' _ck ^2/3 (where _f'ck is the design compressive strength), the tensile strength is much higher than the compressive strength. Has a characteristic of being low, and has a higher energy efficiency in the cutting work as compared with the conventional case where a wire saw or a diamond cutter is used for cutting, and the concrete block C can be fractured / divided with energy saving.

  Further, when the recessed type expansion pipe 1 expands, as shown in FIG. 12, the interval between the recessed parts 2a opens first and the concrete mass C is pushed open, so that a crack is generated along the groove direction of the recessed part 2a. Conceivable. Therefore, as described above, in the expansion tube inserting step, by setting the groove directions of the recesses 2a of the recess type expansion tubes 1 so as to face the same direction or to face opposite directions, The concrete block C can be split along any break line L.

  Regarding the direction of this crack, the applicants made a test piece of a non-reinforced concrete column having a square cross section, and as shown in FIG. 11, the test piece was placed so that the groove direction of the concave portion 2a faced diagonally. Experimentally confirmed expansion and cracks running along the diagonal of the test piece.

  Further, although the core hole H has to be drilled in advance, it is easy to simultaneously inflate a plurality of recess type expansion tubes 1 by the high water pressure supply unit WU, and by devising the progress of the process, It is also possible to reduce the working time as a whole, as compared with a cutting method using a wire saw or a diamond cutter that can only cut from two directions or two directions.

(4) Carrying out and removing step Next, in the solid cleaving and dismantling method according to the present embodiment, a carrying out and removing step is carried out in which the concrete block C ruptured to an arbitrary size in the previous step is loaded into the carrying vehicle and carried out and removed. (Not shown). Specifically, the concrete lump C broken to an arbitrary size is loaded into a unloading vehicle such as a dump truck using a heavy machine such as a power shovel or a hydraulic crusher, and is unloaded. As a result, the dismantling work of the concrete mass by the solid splitting dismantling method according to the present embodiment is completed.

  At this time, concrete can be finely crushed and recycled as gravel, etc., and steel materials such as reinforcing bars and expansion pipes can be melted and reshaped into deformed reinforcing bars, etc. Sorted and shipped. According to the solid splitting and dismantling method according to the present embodiment, since no concrete adheres to the expansion pipe, this sorting can be performed very easily. Also, since the fluid that is injected into the discarding expansion pipe is water, there is no concern about environmental pollution, so it is possible to discard the expansion pipe without checking the remaining fluid, thus reducing sorting time. Can be planned.

  According to the solid splitting dismantling method according to the present embodiment described above, the concrete mass C that is an existing solid can be split while adjusting the pressure of the fluid that is press-fitted into the recessed expansion tube 1 by the high water pressure supply unit WU. Yes, there is little risk of noise. In addition, since the concave type expansion tube 1 is pressurized by water, even if the fluid leaks out, there is little possibility of contaminating the surrounding environment like a static crushing agent. Further, compared to cutting with a wire saw or a diamond cutter, dust is not generated and it is environmentally friendly. Moreover, there is little risk that an operator will be caught in the wire saw or the diamond cutter and injured, and the concrete block C can be safely disassembled in a short time.

  Further, according to the solid splitting dismantling method according to the present embodiment, water is pressed into the plurality of recess type expansion tubes 1 inserted in the plurality of core holes H at substantially the same time to expand, and therefore, along the fracture line L. The concrete lump C can be split at a stretch and divided. Therefore, the existing solid can be disassembled more safely in a short time, and the disassembly cost can be reduced.

  Moreover, according to the solid splitting dismantling method according to the present embodiment, the concrete block C is split using the small-diameter recessed expansion tube 1, so that the diameter of the core hole H drilled in the core removing step is about 40 mm. It is possible to dismantle the concrete lump C in a shorter time by shortening the working time of the core removing process and reducing the dismantling cost.

<Construction method for dismantling reinforced concrete floor slab of bridge>
Next, a method for dismantling and removing a reinforced concrete composite floor slab of a bridge according to an embodiment of the present invention using the recessed expansion tube 1 according to the above-described embodiment will be described with reference to FIGS. 12 to 19.

  As shown in FIG. 12 and FIG. 13, a main girder K made of a shaped steel such as an I-shaped steel is laid at predetermined intervals between lower structures T such as bridge piers, and a reinforced concrete floor is placed on the main girder K. Reinforced concrete composite floor slab of bridge B in which the main girder K and the concrete floor slab S are integrated by a headed stud dowel SJ (see FIG. 15) formed with the slab S and protruding from the upper surface of the flange of the main girder K An example of dismantling and removing S will be described.

(1) Core removal step First, in the method for dismantling the reinforced concrete floor slab of the bridge according to the present embodiment, as shown in FIGS. 14 and 15, the dismantling removal is performed in consideration of the positions of the headed stud dowel SJ and the slab anchor. A core removing step of setting a break line L2 in a girder portion A1 above the main girder K of the concrete floor slab S to be formed, and drilling a plurality of core holes H2 at predetermined intervals along the break line L2. I do. Specifically, the broken line L2 is marked (positioned) on the carry portion A1, the center position of the core hole H2 is marked at a predetermined interval, and a core removing device such as a core drill is set according to the marking. .. Then, the core removing device is operated to drill the core hole H2 having a depth reaching the upper surface of the flange of the main girder K.

  The interval between the core holes H2 may be appropriately determined by previously confirming the range in which one expansion tube can be split by experiments or the like according to the thickness of the concrete floor slab S to be broken and disassembled and the reinforcing bar arrangement. .. When the concrete floor slab S having a general thickness of about 350 mm is split by the recess type expansion tube 1 described above, the spacing may be about 20 to 100 cm.

(2) Expansion pipe inserting step Next, in the method for dismantling and removing the reinforced concrete floor slab of the bridge according to the present embodiment, as shown in FIG. 16, the core holes H2 of the plurality of core holes drilled in the previous step are formed. The expansion tube inserting step of inserting the recessed type expansion tube 1 described above is performed. Specifically, as shown by the arrows in FIG. 16, the recess type expansion tubes 1 of the recess type expansion tubes 1 are arranged so that the groove directions of the recesses 2a of the expansion tube body 2 coincide with each other along the fracture line L2. The recess type expansion tubes 1 are inserted into the core holes H2 so that the groove directions of the recesses 2a face the same direction or the opposite directions.

  Then, as shown in FIG. 16, the above-described high water pressure supply unit WU to be connected via the pressure adapter CA is set to all of the plurality of recess type expansion tubes 1 inserted in the respective core holes H2, and the plurality of recesses are set. High pressure water can be supplied to all of the mold expansion tubes 1.

(3) Floor slab breaking and removing step Next, in the method for dismantling and removing the reinforced concrete floor slab of the bridge according to the present embodiment, as shown in FIGS. 17 and 18, the concrete floor slab S is broken except for the girder portion A1. Perform the floor slab breakage removal process. Specifically, using a wire saw or a diamond cutter, the concrete floor slab S excluding the girder portion A1 is ruptured into a size that can be lifted by a lifting device such as a crane and divided, and the slab is ruptured to separate another floor slab. The broken pieces that have become separable from the part are lifted by a lifting device and sequentially removed.

  Of course, instead of cutting with a wire saw or a diamond cutter, the core hole may be drilled along the breaking line, and the concave expansion tube 1 may be used to split and carry out. By doing so, not only is the risk of dust and the like less likely to occur, but also energy efficiency is good and the environment is friendly. Further, there is little risk that an operator will be injured by being caught in the wire saw or the diamond cutter, and the concrete floor slab S can be disassembled safely and in a short time.

  In addition, when the concrete floor slab S except for the girder portion A1 is divided using the concave type expansion tube 1, the concave type expansion tube 1 is expanded to split the concrete floor slab S and exposed from the cracks generated. The reinforced steel bars are melted and broken and removed.

  The (1) core removing step, (2) expansion tube inserting step, and (3) floor slab breaking and removing step may be performed concurrently in parallel. However, it is preferable that (1) the core removing step and (2) the expansion tube inserting step are performed in a state with a scaffold, and (3) before the floor slab is removed in the floor slab breaking and removing step, the girders around the floor slab are removed. It is desirable that the (1) core removing step and the (2) expansion tube inserting step of the portion A1 be completed.

(4) Expansion Tube Expansion Step Next, in the method for dismantling and removing the reinforced concrete floor slab of the bridge according to the present embodiment, as shown in FIG. 19, a plurality of recessed-type expansion tubes 1 inserted in a plurality of core holes H2. Then, an expansion pipe expanding step is performed in which water is press-fitted through the high water pressure supply unit WU to expand the recessed expansion pipe 1 and split the girder portion A1 of the concrete floor slab S along the break line L2. Specifically, the high water pressure supply unit WU is operated to simultaneously inject and fill water into each recess type expansion pipe 1 via the pressurizing adapter CA, and the recess pressure type expansion pipe 1 is supplied with the water pressure as shown in FIG. And the pressure is applied to the girder portion A1 from the inside to apply a tensile stress to the concrete of the girder portion A1, and the girder portion A1 is split along the fracture line L2 to be divided.

  At this time, along with the splitting of the girder portion A1, the headed stud dowel SJ, which integrated the main girder K and the concrete floor slab, and the concrete are displaced and separated, and the girder portion A1 is easily removed.

  Further, when the girder portion A1 is scraped off by a breaker or a pick as in the conventional method, the tip of the breaker or the like comes into contact with the upper surface of the flange of the main girder K, which is a steel girder, and its vibration noise is generated. There is no possibility that a large noise is generated by being amplified by a member having a wide area such as. In addition, since the plurality of recessed type expansion pipes 1 separated by using the high water pressure supply unit WU can be simultaneously expanded to divide the carry portion A1, the carry portion A1 can be efficiently divided.

(5) Carrying out and removing step Next, in the method of dismantling and removing the reinforced concrete floor slab of the bridge according to the present embodiment, a carrying out and removing step is carried out in which the girder portion A1 divided in the previous step is loaded into the carrying vehicle and carried out and removed. (Not shown). Specifically, the divided girder portion A1 is loaded into a unloading vehicle such as a dump truck and carried out using a heavy machine such as a power shovel or a hydraulic crusher. As a result, the dismantling and removing work of the concrete slab S by the dismantling and removing method of the reinforced concrete slab of the bridge according to the present embodiment is completed.

  At this time, according to the method for dismantling and removing the reinforced concrete floor slab of the bridge according to the present embodiment, since concrete does not adhere to the expansion pipe as described above, the concrete and the steel material can be sorted very easily. Also, since the fluid that is injected into the discarding expansion pipe is water, there is no concern about environmental pollution, so it is possible to discard the expansion pipe without checking the remaining fluid, reducing the sorting time. Can be planned.

  According to the method for dismantling and removing the reinforced concrete floor slab of the bridge according to the present embodiment described above, the existing solid can be split while adjusting the pressure of the fluid that is pressed into the expansion pipe by the high water pressure supply unit WU, and noise can be generated. There is no danger of this occurring. Moreover, since only a fluid such as water is used, even if the fluid leaks out, there is little possibility of contaminating the surrounding environment like a static crushing agent. In addition, the generation of dust and the like can be reduced, and energy efficiency is good, which is environmentally friendly. In addition, it is possible to reduce the risk of an operator being injured by being caught in the wire saw or the diamond cutter, and safely dismantling the concrete floor slab S in a short time.

  As described above, the solid splitting dismantling method and the dismantling removing method of the reinforced concrete floor slab of the bridge according to the embodiment of the present invention have been described in detail, but the embodiments described above or illustrated are embodied in carrying out the present invention. However, the technical scope of the present invention should not be limitedly interpreted by these. Furthermore, the present invention may be applied when the concrete floor slab portion is divided into small pieces.

1: Recessed expansion tube (expansion tube)
2: Expansion tube main body 2a: Recessed portion 3: Sealing sleeve 30: Sleeve main body 31: Sealing metal fitting 4: Injection sleeve 40: Injection sleeve main body 41: Small diameter sleeve 42: Injection port C: Concrete block (existing solid)
B: Bridge T: Pier (substructure)
K: Main girder (steel girder)
SJ: Stud dowel with head (synthetic material)
S: Concrete slab A1: Girder upper part H, H2: Core hole L, L2: Break line WU: High water pressure supply unit (high pressure water generator)

Claims (4)

A method for splitting and dismantling solids that splits and disassembles existing solids such as existing concrete structures and rock blocks into smaller pieces,
A core removing step of drilling a plurality of core holes at predetermined intervals along a break line for dividing and breaking the existing solid,
An expansion tube inserting step of inserting an expansion tube that expands when a fluid is press-fitted therein into each core hole of the plurality of core holes;
An expansion tube expansion step of press-fitting and expanding a fluid into the plurality of expansion tubes inserted in the plurality of core holes, and cleaving the existing solid along the breaking line ;
The cross-sectional shape of the expansion pipe before the expansion into which the fluid is press-fitted is a shape having a recessed part that is folded inward, and the cross-sectional shape after the expansion into which the fluid is press-fitted is substantially circular. It is a concave type expansion tube that becomes,
In the expansion pipe inserting step, the recess type expansion pipe is provided with the core so that the recesses are oriented in the same direction along the fracture line or the recesses are oriented in opposite directions along the fracture line. A solid splitting and dismantling method using an expansion tube characterized by being inserted into a hole. In the expansion tube expansion step, a fluid is press-fitted into the plurality of expansion tubes inserted in the plurality of core holes substantially at the same time to expand the solid material. Splitting and dismantling method. A method for dismantling and removing a reinforced concrete floor slab of a bridge, which comprises removing a reinforced concrete floor slab of a bridge including a steel girder and a reinforced concrete floor slab anchored and integrated with the steel girder,
In the girder portion of the reinforced concrete floor slab that is above the steel girder, along the girder break line that divides and breaks the girder portion, a core removing step of drilling a plurality of core holes at predetermined intervals,
The cross-sectional shape before expansion into which the fluid is press-fitted is a shape having a recessed part that is folded inward, and the cross-sectional shape after expansion into which the fluid is press-fitted is a substantially circular recessed type expansion tube The recess-shaped expansion tubes are arranged so that the recesses are oriented in the same direction along the girder break line, or the recesses are oriented in opposite directions along the girder break line. Expansion tube inserting step of inserting in each core hole of the hole,
In parallel with the core removal step and the expansion tube insertion step, or after the completion of the expansion tube insertion step, except for the girder portion, a floor slab breaking removal step of breaking and removing the reinforced concrete floor slab,
After the floor slab breaking and removing step, the fluid is press-fitted into the plurality of recess type expansion tubes inserted in the plurality of core holes to expand, and the expansion for splitting the girder portion along the girder break line. A method of dismantling and removing a reinforced concrete floor slab of a bridge using an expansion tube, characterized by comprising a tube expansion step. In the floor slab breaking and removing step, after splitting the reinforced concrete floor slab using the expansion pipe, the exposed reinforcing bars are melt-cut from the generated crack, and the reinforced concrete floor slab is broken and removed. Item 3. A method for dismantling and removing a reinforced concrete floor slab of a bridge according to Item 3 .

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