JP5341466B2 - Adhesive overlay method for existing concrete pavement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesion overlay method for the existing concrete pavement high in bond strength between existing concrete and a cement mixture and excelling in cost and construction time. <P>SOLUTION: The overlay method includes forming a rugged surface on the surface C1 of an existing structure C through shot blasting, applying an adhesive R on the rugged surface, and laying new concrete thereon to lay the cement mixture integrally on the existing concrete. An epoxy adhesive is used as the adhesive R, and the cement mixture is laid under the conditions that the applied amount to the rugged surface is 0.4 kg/m<SP>2</SP>or more. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an adhesion overlay method used for repairing concrete pavement.

JP-A-9-71902 “Top Surface Pressure Boosting Method Design and Construction Manual”, Highway Research Committee, November 1995, P.A. 10-17, 59-101

  For concrete pavements in structures such as steel bridge RC floor slabs and runways, repairs are required if they are damaged due to repeated action or subsidence due to traffic load after the start of service. As a repairing method at this time, a floor slab thickening method or an overlay method using concrete (SFRC) mixed with steel fibers is carried out. This is to lay new concrete on existing concrete.

  In the above construction method, it is important from the viewpoint of the structure and durability (life) that the existing concrete and the new concrete are integrated, and after the repair, these are integrated. Therefore, after cutting the existing concrete surface or concrete pavement surface, shot blasting is performed by hitting steel balls, and a new surface or pavement surface is created by overlaying the new concrete on top of it (non-patented) Reference 1).

  In addition, the fragile part of the existing concrete surface is removed with a water jet that injects high-pressure water, and an uneven surface is formed. Further, a small uneven surface is formed by shot-blasting, and the existing concrete and the new concrete (overlay concrete) A method for further improving the adhesion has been developed (Patent Document 1).

  In order to ensure the adhesion between the existing concrete and the new concrete (overlay concrete), the surface treatment is performed by shot blasting as described above to form an uneven surface, but this alone cannot provide sufficient adhesion strength. Therefore, if a water jet is used in combination as in the invention described in Patent Document 1, the adhesion strength is higher than that of shot blasting alone, but a large amount of water is required for the construction, and the concrete glass (crushing of existing concrete) The conventional method has problems in terms of cost and construction time, such as generation of a large amount of waste water containing a single piece) and the need to dry the treated surface before overlaying.

  In view of the above problems, the present invention does not require the use of a water jet, has high adhesion strength between existing concrete and new concrete (overlay concrete), and is excellent in terms of cost and construction time. It is an object to provide an adhesion overlay method.

In order to solve the above problems, the invention according to claim 1 of the present application forms an uneven surface on the surface C1 of the existing structure C, applies an adhesive R to the uneven surface, and lays a cement mixture thereon. By doing so, it is an overlay method capable of integrating and laying the cement mixture on existing concrete, and an epoxy adhesive is used as the adhesive R, and the epoxy adhesive is fatigued 2 million times under water-filled conditions. There is no strength reduction in the test, the compressive strength is 50 MPa or more, the compressive elastic modulus is 1000 MPa or more, the bending strength is 35 MPa or more, the tensile shear strength is 10 MPa or more, the residual tensile strength is 90% or more in the exposure condition of JISK6857 treatment condition E, or the base material breaks. be those, the coating amount to the irregular surface and wherein the set to 0.4 kg / m ² or more, adhesion over the existing concrete pavement To provide a gastric method.

  Note that the above phrase “cement mixture” mainly includes “mortar” in which cement, fine aggregate, water, and admixture are mixed, and mainly cement, fine aggregate, coarse aggregate, water, and admixture. The concept including any of the mixed “concrete” is shown (the same applies hereinafter). In this invention, this cement mixture is used as what is corresponded to the new concrete laid by the said conventional construction method.

  Further, the invention according to claim 2 of the present application is to lay the cement mixture under the condition that the adhesive R is in a semi-solidified state after the adhesive R is applied to the uneven surface. The condition in which the agent R is in a semi-solid state is a condition in which the difference in pulling force between the leading nut Na and the trailing nut Nb is 5 N or less when the bond nut tensile test is performed. However, the adhesive application step of applying the above-mentioned application amount of the adhesive R on the polished iron plate P1, and the pre-adjusted nut Na, which is a nut subjected to galvanization of M6, immediately after the application step, It is composed of the same shape and material as the preceding nut Na, with a delay from the leading nut placement step and the leading nut placement step in which the lower end surface is in contact with the adhesive R applied on the iron plate P. Other nuts which are other nuts After the nut Nb and the post-nut arrangement step, the post-nut Nb and the post-nut Nb are arranged after the post-nut arrangement step and the post-nut arrangement step. It has the pulling-up force measurement process of peeling from said iron plate P1 by pulling up, and measuring the pulling force required in this case, The adhesion overlay construction method of the existing concrete pavement of Claim 1 characterized by the above-mentioned is provided. .

  Note that the “surface C1 of the existing structure C” includes both the surface exposed from the original in the existing structure C and the surface that appears due to the cutting work performed prior to the shot blasting.

  The invention according to claim 3 of the present application is the existing concrete according to claim 1 or 2, wherein the mass ratio of the aggregate to the cement in the cement mixture is 0.7 or more and 8.0 or less. Provide pavement overlay method.

  The invention according to claim 4 of the present application uses a resin spraying device for applying the adhesive R. The resin spraying device includes a moving body unit 1, an injection nozzle unit 2, a control unit 3, a mist suction unit. The moving body 1 includes driving wheels 11 and is movable in at least one direction on the surface C1 of the structure C. The injection nozzle 2 A direction that is provided at an end portion in the moving direction, can spray the adhesive R from the injection port 21, is parallel to the surface C1 of the structure C, and intersects the moving direction of the moving body portion 1. The control unit 3 controls the movement of the moving body unit 1 and the injection nozzle unit 2, and the mist suction unit 4 includes a scattering prevention cover 4a. The cover 4a is an injection port of the injection nozzle part 2 1 and the surface C1 of the structure C are covered. The scattering prevention cover 4a is provided with a suction port 42a, and the suction port 42a is connected to the dust collector 5 through the exhaust path E. The adhesion overlay method of the existing concrete pavement according to any one of claims 1 to 3, wherein the overlay method is used.

  In the invention according to claim 5 of the present application, the driving wheel 11 of the resin spraying device is a set of two endless track rings (caterpillars) provided in parallel. In addition, nozzle support rails 6 and 6 are provided so as to extend in a direction orthogonal to the moving direction of the moving body portion 1, and the nozzle support rails 6 and 6 are provided on the support structure 6 a. The support structure 6a has a truss structure in which three horizontal structural members are arranged in a triangular shape in a longitudinal sectional view, and each horizontal structural member is connected by a truss member, and the nozzle A lateral movement base portion 7 that is movable along the support rails 6 and 6 is provided. The lateral movement base portion 7 includes a link portion 72 having a four-bar link structure, and is provided on the link portion 72. The nozzle support part 73 can be moved up and down. Ri, in the nozzle support 73 is characterized in that the the injection nozzle portion 2 and the scattering prevention cover 4a is attached, according to claim 4, provides a deposited overlay method of existing concrete pavement.

  In the invention according to claim 6 of the present application, the scattering prevention cover 4a of the resin spraying device has a side surface portion 43a having a circular inner cross-sectional shape, and the scattering prevention cover 4a The suction pipe 42 having the exhaust path E is integrally provided. The suction pipe 42 has the suction port 42a. The horizontal component of the axis A in the suction port 42a of the suction pipe 42 is 6. The angle θ based on the radial direction D of the side surface portion 43 a in the suction port 42 a is in the range of 80 ° to 95 ° starting from the radially outer side. 6. Provides an overlay method for existing concrete pavement.

  Further, in the invention according to claim 7 of the present application, the scattering prevention cover 4a of the resin spraying device has a side surface portion 43a having a circular inner cross-sectional shape, and the scattering prevention cover 4a The suction pipe 42 having the exhaust path E is integrally provided. The suction pipe 42 has the suction port 42a. The horizontal component of the axis A in the suction port 42a of the suction pipe 42 is The adhesion overlay method for an existing concrete pavement according to claim 4 or 5, characterized by being coincident with a horizontal tangent line of a virtual plane X that is concentric with the inner peripheral surface of the side surface portion 43a.

  The invention according to claim 8 of the present application is characterized in that the suction pipe 42 of the resin spraying device is provided in two or more positions symmetrically with respect to the central axis of the anti-scattering cover 4a. The adhesion overlay method of the existing concrete pavement as described in 4 or 5 is provided.

  In the invention according to claim 9 of the present application, the scattering prevention cover 4a of the resin spraying device has an outer cylinder portion 43 and an inner cylinder portion 44 provided inside the outer cylinder portion 43. The suction port 42a is provided between the outer cylinder part 43 and the inner cylinder part 44, and is between the outer cylinder part 43 and the inner cylinder part 44. A guide vane 45 is provided below, and the guide vane 45 is provided in parallel with the axis A of the suction port 42a of the suction pipe 42. The adhesion overlay method of the existing concrete pavement described in 1. is provided.

  Further, in the invention according to claim 10 of the present application, the spray nozzle portion 2 of the resin spraying device starts moving from one end in the moving range and stops at the other end, and when the spray nozzle portion 2 moves. The adhesive R is sprayed only, and the movable body portion 1 stops while the spray nozzle portion 2 is moving, and after the spray nozzle portion 2 stops at the other end, the range where the adhesive R has already been sprayed. 10. The apparatus according to any one of claims 4 to 9, wherein the movement is performed in the opposite direction, and the above operation is automatically and repeatedly controlled by a control pattern previously input to the control unit 3. An adhesion overlay method for existing concrete pavement is provided.

  By the construction method according to the present invention, the adhesion strength of the newly installed concrete (cement mixture) with the existing concrete can be significantly increased as compared with the conventional construction method. Moreover, since the combined use of a water jet is not essential, the generation of concrete glass can be reduced as much as possible. As a result, it is possible to construct a new durable pavement integrated with existing concrete.

  When a dedicated resin spraying device is used, smooth construction is possible.

  Hereinafter, the present invention will be described by taking an example of an embodiment. FIG. 1 is a side view of a resin spraying device used in this example, and FIG. 2 is a plan view thereof. FIG. 4 shows a scattering prevention cover. FIG. 7 shows a construction method.

  In the following description, the left side in FIG. 1 is “front”, and the right side is “rear”. Further, the left side in FIG. 2 is “left”, and the right side is “right”.

  In addition, in the present invention, the surface C1 of the structure C that is a target to which the resin is dispersed may be a horizontal plane or an inclined plane. Moreover, as long as it can maintain the positional relationship with the surface C1 of the structure C while resisting the gravity of the movable body portion 1 of the resin spraying device, it may be a vertical surface or a steeply inclined surface close thereto. . In addition, the surface C1 of the existing structure C may be a flat surface or a rough surface having unevenness from the beginning.

  In the construction method according to the present invention, in order to ensure the adhesion of the laying (overlaying) cement mixture to the existing concrete, the surface portion of the concrete pavement in the existing structure, particularly the surface weakened portion, is shot blasted, for example. After the surface treatment or the cutting process is performed, the surface treatment is performed by, for example, shot blasting to form an uneven surface. An epoxy adhesive is applied to the concavo-convex surface thus formed, and a cement mixture is laid thereon and integrated under the condition that this adhesive has an adhesive effect (details will be described later). In this way, since it is sufficient to cut the existing concrete only when necessary, a small amount of concrete is generated, and no drying treatment is required as in the case of using a conventional water jet.

  Next, the construction method according to the present invention is shown in the order of steps. First, an uneven surface is formed on the surface of an existing concrete pavement, for example, by shot blasting. If there is a damaged part such as a slight crack on the existing concrete surface, the part is cut and removed, and then shot blasting is performed. In shot blasting, a shot material such as a steel ball having a particle diameter of about 2 mm is struck onto the surface to form an uneven surface, and the shot material and dust generated by blasting are sucked.

  Here, “shot blasting” in the present invention refers to a process in which a large number of solids collide with a target surface and the target surface is scraped off by an impact force when these solids collide. Therefore, the material and size of the shot material are not limited to those exemplified above.

  In addition, formation of an uneven surface is not limited to the above-described shot blasting, and for example, a polishing means such as a blade may be applied to the surface portion of concrete pavement. In some cases, a water jet may be used in combination as in the prior art.

  Thereafter, an epoxy adhesive is sprayed and applied to the uneven surface formed as described above with a dedicated machine (resin spraying device described later). In addition, the epoxy adhesive used in this construction method has no decrease in strength in a 2 million times fatigue test under water-filled conditions, and has a compressive strength of 50 MPa or more, a compression elastic modulus of 1000 MPa or more, a bending strength of 35 MPa or more, and a tensile shear strength of 10 MPa or more. The residual tensile strength in the exposure condition of JIS K6857 treatment condition E is 90% or more or the base material is destroyed.

  The chemical composition is preferably one in which the main agent is a bisphenol-based epoxy resin and the curing agent is a modified aliphatic polyamine, but may be one having another chemical composition.

  And after applying an epoxy adhesive to an uneven surface as mentioned above, cement mixture, such as ready-mixed concrete conveyed by the agitator car, is struck, and the surface layer by a new cement mixture is formed. However, this cement mixture was placed immediately after the adhesive was applied after the adhesive was applied, in a condition where the adhesive R was in a semi-solidified state, that is, when a bond nut tensile test was performed. The difference between the force that pulls the nut up for a predetermined time (advance pulling force) and the force that pulls the nut installed after a predetermined time after applying the adhesive (rear pulling force) is 5N or less, more preferably 4N or less. Must be done under conditions.

Examples of the composition of the cement mixture to be laid (overlaid) include the following concrete. In addition, the mixing | blending of the cement mixture used by this invention is not limited to this.
Slump: 6.5 ± 1.5cm, Air volume: 4.5 ± 1.5%, W / C = 47%, s / a = 44.4%
Example of unit amount (kg / m ³ ) of each material: W = 157kg, C = 334kg, S = 797kg, G = 1030kg, AE water reducing agent = C × 0.7%
Design standard bending strength: 5.0 N / mm ²
(W: water, C: cement, S: fine aggregate, G: coarse aggregate, W / C: water / cement ratio (mass ratio), s / a: fine aggregate ratio (total aggregate The volume ratio of fine aggregates)

  Here, the nut tension test of the bond uses a test method described in Japanese Patent Application Laid-Open No. 2007-240215. However, the test in the present application is performed using a flat steel plate P without using the simulated steel deck slab described in the above publication. Incidentally, here, a flat plate made of SS400 having a thickness of 9 mm and a length and width of 300 mm was used.

  FIG. 8 shows a nut N as a test body. When measuring the lifting force as described below, an eye bolt B having a bolt shaft B1 of the same diameter is screwed into the screw hole N1 of the nut N. . Thus, by using a nut as a test body, a general-purpose product can be used at a low cost and a test can be performed very efficiently. In addition, the test using nuts in this way has been proven in the “Nut Tensile Test” proposed by the Resin Pavement Technology Association to determine whether or not traffic can be released after the construction of the resin-type non-slip pavement. It has a high reliability test method.

  Next, the execution procedure of this test will be described. FIG. 9 is a diagram showing the procedure of the test method.

(1) Adhesive application process As shown in FIG. 9B, the adhesive R is mixed with the main agent and the curing agent on the surface of the iron plate P whose surface has been polished as shown in FIG. 9A. Apply after. The coating amount per unit area is made equal to the coating amount on the uneven surface. However, the range of coating amount 0.4kg / m ² ~1.4kg / m ² because no output is substantial difference in pull-up force of the nut, the difference in coating amount of within the range acceptable.

(2) Leading nut arrangement process Immediately after the application process of (1) above, the leading nut Na is arranged on the iron plate P coated with the adhesive R as shown in FIG. As the leading nut Na and the following trailing nut Nb, steel nuts having a size of M6 and galvanized are used. This arrangement is made so that the lower end surface of the leading nut Na is in contact with the applied adhesive R.

(3) Retrofit nut arrangement process The retrofit nut Nb, which is another nut made of the same shape and material as the advanced nut Na, is delayed from the advance nut arrangement process of (2) above. Like the nut Na, as shown in FIG.9 (d), it arrange | positions on the iron plate P which apply | coated the adhesive agent.

(4) Lifting force measuring step After the (3) retrofit nut arrangement step, the leading nut Na and the retrofit nut Nb are peeled off from the iron plate P1, and the lifting force required at this time is measured. The lifting force is measured by screwing the eyebolt B shown in FIG. 8 into each of the leading nut Na and the trailing nut Nb, and attaching a measuring means such as a suspension scale S to the hook portion of the eyebolt B to attach the eyebolt B. The maximum pulling force when the nuts Na and Nb are peeled off is measured.

  In order to measure the change in the pulling force of the post-attached nut Nb with respect to the elapsed time between the pre-attached nut arranging step and the post-attaching nut arranging step, the above steps (1) to (4) are changed by changing the elapsed time. Repeat several times.

  However, in order to increase the efficiency of the measurement, the number of nuts N corresponding to the number of times the lifting force is measured with respect to the elapsed time is arranged in the leading nut arrangement step (2), and the elapsed time to be measured. Each time, the above nut (N) may be used as the retrofit nut Nb, and the above (3) retrofit nut arrangement step and (4) the lifting force measurement step may be repeated.

  Further, in order to increase the reliability of the measured value of the lifting force, a plurality of sets of the front nuts Na and the back nuts Nb are arranged for one elapsed time, and a plurality of tests are measured for each group. You may calculate the average value of the raising force value which concerns on a body, and may evaluate this average value as the raising force in the said elapsed time.

  The bond nut tensile test is performed as described above. This test may be performed at an actual construction site, or may be performed in advance under the same conditions as the construction site. That is, this test is not necessarily performed at the construction site in the present invention.

  Moreover, in actual construction, the temperature around the construction site and the wind speed are defined, and a list that satisfies the above test results under those conditions can be confirmed at a glance after the adhesive R has been applied. You may create and use a calculation formula.

  Next, Table 1 shows the results of measuring the nut pulling force and the adhesive strength of the cement mixture by the nut tension test of the above bond under various environmental temperatures. In addition, the elapsed time when the above-mentioned (4) lifting force measurement step was performed is an elapsed time based on the time when the main agent and the curing agent were mixed. No.5 is 60 minutes, No.6 is 180 minutes, No.7 is 330 minutes, No.8 is 375 minutes, No.9 is 180 minutes, No.10 is 240 minutes, No.11 is 270 minutes .

This measurement was performed according to the following procedure (see FIG. 10). First, an existing concrete flat plate having a thickness of 50 mm is prepared, adhesive R is applied to the upper surface thereof, and a cement mixture is overlaid thereon at a height of 50 mm. Then, after curing for a predetermined period, an annular cut having a diameter of 100 mm is made so as to reach the existing concrete portion with a core machine. The adhesive strength was measured by attaching an adhesive plate to the upper surface of the cement mixture at the annular cut portion and pulling it with a Kenken type tensile tester at a loading speed of 6 N / mm ² per minute.

The specifications of the existing concrete and cement mixture (concrete) used for this measurement are the same, and are as follows.
Slump: 8.0 ± 2.5cm, Air volume: 4.5 ± 1.5%, W / C = 38.4%, s / a = 41.3%
Unit amount of each material (kg / m ³ ): W = 173kg, C = 451kg, S = 686kg, G = 998kg, AE water reducing agent = C × 1.0%
(W: water, C: cement, S: fine aggregate, G: coarse aggregate, W / C: water / cement ratio (mass ratio), s / a: fine aggregate ratio (total aggregate The volume ratio of fine aggregates)

  The leading lifting force in the table is the force required when pulling up the leading nut Na installed immediately after applying the adhesive R as described above, and the trailing lifting force is applied by applying the adhesive. The force required when pulling up the post-attached nut Nb installed after a predetermined time. The adhesion strength of the laying (overlaying) cement mixture is not related to the front pulling force and the rear pulling force, but depends on the difference between the rear pulling force and the front pulling force. In other words, when the difference between the leading pulling force and the trailing pulling force exceeds 5N (No.8, 10, 11 in the table), the adhesive strength is low because it breaks at the cement mixture and adhesive interface. If the difference in pulling force is 5 N or less (No. 3-7, 9 in the table), the base material is broken and sufficient adhesion strength is obtained. In addition, the above is not affected by the environmental temperature. It can be said that it is effective to drive the cement mixture when the difference between the front pulling force and the post pulling force in the nut tensile test is 5 N or less. In order to perform the above-mentioned cement mixture driving construction under conditions where the pulling force difference is 5 N or less, it is difficult in time to apply the adhesive by manpower construction, and the adhesive varies depending on the individual differences of the construction workers. Is difficult to apply uniformly, and a special applicator is required.

  Here, the relationship between the composition of the cement mixture to be laid (overlaid) and the adhesion strength is also mentioned. The mass ratio of aggregate to cement in the cement mixture is desirably 0.7 or more and 8.0 or less. This is considered to be because the adhesion strength increases as the contact area between the aggregate and the adhesive R increases. The above upper limit is determined by the minimum proportion of cement required to bond the aggregates.

  An experiment on this was performed and will be described below. As the cement mixture to be laid (overlaid), mortar and concrete were used. The fine aggregate (sand) blended in this experiment has a particle size distribution as shown in Table 2.

  In the cement mixture used in this experiment, the mass ratio S / C (aggregate / cement mass ratio) of aggregate to cement is 0 (cement paste), 0.1, 0.5, 0.75, 1 , 1.5, 2, 2.4, 4.4, 5.5. Of these, those with S / C of 0.1 to 4.4 are mortars in which cement and fine aggregate are mixed, and those with S / C of 5.5 are cement, fine aggregate and coarse bone. Concrete mixed with wood. The fine aggregate rate (s / a) of this concrete is 44.4%.

  Using the above ten cement mixtures, a cylindrical specimen was prepared in the following manner, and the load was measured to calculate the adhesion strength.

  The existing concrete part of the test specimen for this measurement was prepared by first producing a concrete cylinder having a diameter of 100 mm and then cutting this cylinder to a height of 50 mm. The existing concrete portion is placed in a mold having a diameter of 100 mm, and the adhesive R is applied to the cut surface as described above. Thereafter, a cement mixture was cast on the applied adhesive R at a height of 50 mm to obtain a specimen having a diameter of 100 mm and a height of 100 mm. This specimen was cured for 7 days or more and then the load was measured.

Load measurements, equipped with a jig at each end portion in the axial direction of the specimen was performed pulled at loading rate per minute 0.4 N / mm ² in the axial direction. The maximum load measured in this way was divided by the cross-sectional area at the time of fracture to determine the bond strength.

  The results of this experiment are shown in Table 3. It was confirmed that there was a significant difference in adhesion strength between S / C of 0.5 or less and 0.75 or more.

  And there was almost no difference in adhesion strength between S / C 4.4 and 5.5. In addition, the inventors of the present application have obtained a result that there is almost no difference when the adhesion strength is measured by changing the fine aggregate ratio between 40% and 50% separately from the above. From these facts, the results of this experiment are considered to apply to both mortar and concrete.

  Next, an example is given and demonstrated about the resin spraying apparatus used by this invention. As shown in FIG. 1 and the like, this includes a moving body portion 1, an injection nozzle portion 2, a control portion 3, and a mist suction portion 4.

  The moving body unit 1 is provided with a driving wheel 11 on a main body frame 12, and is movable on the surface C1 of the existing structure C in at least one direction. The driving wheel 11 in the example shown here (hereinafter referred to as “this example”) is driven by the power of the electric motor 13 shown in FIG. 2 being transmitted through the speed reducer 14 and the driving shaft 15, and is parallel. This is a set of two endless track rings (caterpillars) installed in, which can move forward and backward. Although this endless track ring (caterpillar) has the advantage of being excellent in straight running performance, it is desirable, but the drive wheel 11 may be a general wheel instead of such endless track ring (caterpillar). In this example, a rubber caterpillar is used, but a metal caterpillar may be used, and various changes can be made.

  Further, when the surface C1 of the structure C is a vertical surface or a steeply inclined surface close thereto, for example, along the temporary rail or rack provided along the surface C1 of the structure C, the moving body 1 Can be applied by providing the movable body 1 with wheels and gears that can be moved against gravity.

  In addition, the moving body unit 1 is provided with an arm unit 16 and a dust collector 5. These functions will be described later.

  The moving body 1 is provided with nozzle support rails 6 so as to extend in a direction orthogonal to the moving direction of the moving body 1. As shown in FIG. 2, the nozzle support rail 6 according to this example is provided on a support structure 6 a that extends in the left-right direction at the rear end portion of the movable body portion 1. In this support structure 6a, three horizontal structural members (structural steel pipes in this example) are arranged in a triangular shape in a longitudinal sectional view (see FIG. 1), and each of the horizontal structural members is a truss member. By having the truss structure connected by, it has high rigidity while being lightweight. Therefore, it is easy to form the support structure 6a with a dimension corresponding to the dimension in the left-right direction of the construction range, thereby enabling large-scale construction. In addition, the left-right direction dimension of the support structure 6a which concerns on this example is 4.5 m.

  The support structure 6a can change the height from the surface C1 of the structure C by rotating the eleverter handle 61, thereby setting the injection nozzle 2 at an optimum position. be able to.

  The nozzle support rail 6 is provided with a lateral movement base portion 7. The lateral movement base portion 7 includes a wheel 71 that rotates along the nozzle support rail 6, a link portion 72 having a four-bar link structure, a nozzle support portion 73 that is a portion to which the injection nozzle portion 2 is attached, a driving motor 74, a gear. A box 75 is provided. The link portion 72 can be moved up and down due to the provision of the electric cylinder, and the spray nozzle portion 2 can be arranged at an appropriate height with respect to the surface C1 of the structure C. A driving gear (not shown) is provided at the tip of the rotation shaft of the gear box 75, and the power of the driving motor 74 is transmitted to the driving gear via the gear box 75. The driving gear meshes with a rack provided in the moving body portion 1 in parallel with the nozzle support rail 6, whereby the lateral movement base portion 7 is brought into contact with the nozzle support rail 6 as the driving electric motor 74 rotates. Along the left and right directions.

  In this example, one lateral movement base portion 7 is provided for each set of nozzle support rails 6. However, it is assumed that two or more lateral movement base portions 7 are provided, and each lateral movement base portion 7 is provided. It is good also as what shares a construction range for every.

  Further, in the present invention, the nozzle support rail 6 is not essential, and the lateral movement base portion 7 extends in a direction (left and right direction in this example) intersecting the moving direction (front and rear direction in this example) of the movable body portion 1. Anything that can be moved is acceptable. As an example, it is conceivable that the moving body 1 is supported by an arm, a chain, or a belt, but various other means may be employed.

  The injection nozzle part 2 is provided in the edge part (rear edge part in this example) in the moving direction of the mobile body part 1 via the nozzle support rail 6 as mentioned above. Specifically, the injection port 21 is attached to the nozzle support portion 73 of the lateral movement base portion 7 so as to face downward. This injection nozzle part 2 can inject the adhesive R from the injection port 21, and is parallel to the surface C 1 of the structure C by moving the lateral movement base part 7 along the nozzle support rail 6. In addition, it is possible to move in the direction intersecting the moving direction of the moving body 1. That is, the injection nozzle unit 2 moves along the nozzle support rail 6.

  The spray pattern SP of the adhesive R sprayed from the spray nozzle 2 in this example is elongated in the front-rear direction as shown in FIG. As shown in the drawing, each spray pattern SP has a tapered shape at both ends in the front-rear direction, and the spray amount of the adhesive R is reduced. Therefore, in order to evenly spread the adhesive R over the entire construction range, as described later, the construction is sequentially performed so that both ends in the front-rear direction of the spray pattern SP of the adhesive R overlap.

  A resin supply hose 8 is connected to the injection nozzle portion 2. The resin supply hose 8 in this example is connected to a high-pressure pump vehicle P (not shown) arranged around the construction site separately from the resin spraying device, and from this high-pressure pump vehicle P, compressed air and adhesive R Is supplied. In this example, as the adhesive R, a two-component type of a main agent and a curing agent is used, so two resin supply hoses 8 are connected to the injection nozzle portion 2 and the two components are supplied separately. Then, the compressed air and the adhesive R are mixed inside the injection nozzle portion 2 and are jetted out from the jet port 21 to the surface C1 of the structure C at a high pressure. Note that, as in the present example, the adhesive R or the like is not supplied from the high-pressure pump car P, and the movable body 1 may be provided with a set of a resin tank, a compressor, and a pump.

  The injection nozzle unit 2 is provided with an on-off valve 22 that can open and close the flow path of the adhesive R. This on-off valve 22 is controlled by the control unit 3 described later in this example, and is opened only when the injection nozzle unit 2 is moving along the nozzle support rail 6. Specifically, each of the sections W1 to W5 shown in FIG. The on-off valve 22 is operated by compressed air supplied by a compressor (not shown) provided in the moving body unit 1. As shown in FIG. 7, the opening / closing valve 22 is opened only during the movement of the injection nozzle portion 2, so that the construction section in one direction and the construction section in the opposite direction are shifted backward as shown in FIG. 7. When covering the cover, the application amount of the adhesive R does not increase at the end of each construction section, and uniform construction is possible.

  The injection nozzle unit 2 can be implemented in various forms. For example, the one lateral movement base part 7 may be provided with a plurality of injection nozzle parts 2-2. Moreover, the one injection nozzle part 2 may be provided with a plurality of injection ports 21. In the case where a plurality of injection nozzle portions 2 and 2 are provided, the injection ports may be arranged in a horizontal row, or may be arranged in a polygonal shape in plan view. In addition, the spray pattern of the adhesive R ejected from the spray port 21 can have various shapes such as a circle, an ellipse, and an oval other than the present example.

  In this example, the control unit 3 is provided in the moving body unit 1. The control unit 3 uniformly controls the endless track ring (caterpillar) 11 of the moving body unit 1, the driving motor 74 of the lateral movement base unit 7, and the on-off valve 22 of the injection nozzle unit 2, thereby uniformly bonding. The agent R can be sprayed and construction with high accuracy is possible. The control unit 3 has a built-in microcomputer (referred to as “program controller”), and can automatically control the above-described units (full automatic program operation control) according to a control pattern inputted in advance. The control unit 3 includes a switch, an inverter, a relay, and the like for operating each unit in addition to the microcomputer. It should be noted that during the adjustment / positioning or when the apparatus is moved, the control by the control unit 3 can be turned off to perform manual operation.

  The control pattern is input by transferring a control pattern created using dedicated software on a personal computer separate from the control unit 3 to the microcomputer. Details of the operation control will be described later.

  The mist suction part 4 sucks and collects the splash (mist) of the adhesive R that the dust collector 5 provided on the moving body part 1 has not fixed on the surface C1 of the structure C, and scatters around the resin spraying device. It is provided not to let you.

  This mist suction part 4 is provided with a scattering prevention cover 4a, and this scattering prevention cover 4a covers the space between the injection port 21 of the injection nozzle part 2 and the surface C1 of the structure C. The cross-sectional shape of the inner peripheral surface of the scattering prevention cover 4a is circular. As shown in FIG. 4, the shape of the anti-scatter cover 4a in this example is such that the upper part is substantially conical, the lower part is cylindrical, and the inside is hollow. The shape is not limited to this, and various shapes such as a cylindrical shape (see FIG. 5), a conical shape, a hemispherical shape, and a bell shape can be implemented.

  A mounting base 41 is provided on the upper part of the scattering prevention cover 4 a, and this mounting base 41 is fixed to the nozzle support portion 73 of the lateral movement base portion 7. And the injection nozzle part 2 has penetrated the upper part of the scattering prevention cover 4a, and the injection port 21 of the injection nozzle part 2 is provided in the scattering prevention cover 4a.

  Further, a skirt portion 46 made of a rubber plate is provided at the lower end portion of the anti-scattering cover 4a in this example so that the gap generated between the surface C1 of the structure C is as small as possible. The lower end portion of the skirt portion 46 in this example is finely divided in the circumferential direction as shown in the figure, so that the resistance is reduced even when the surface C1 of the structure C is rubbed during construction.

  As shown in FIG. 4A, a suction port 42a is opened on the inner surface of the scattering prevention cover 4a. As shown in FIG. 1, the suction port 42 a is an end of an exhaust path E connected to a dust collector 5 provided in the moving body 1. In this example, four suction pipes 42 are provided integrally with the anti-scattering cover 4a, and four duct hoses 47 are attached to each of the four suction pipes 42. As shown in FIG. 2, a collecting chamber 48 is provided at the tip of the arm portion 16 that is movable with respect to the main body frame 12, and the four duct hoses 47 are collected in the collecting chamber 48. The collecting chamber 48 and the dust collector 5 are connected by a single connecting hose 49. The exhaust path E in this example is an air flow path from the scattering prevention cover 4 a to the dust collector 5 through each of the duct hose 47, the collecting chamber 48, and the connecting hose 49.

  The arm portion 16 includes a proximal end arm 16a that is rotatable with respect to the main body frame 12, and a distal end arm 16b that is rotatable with respect to the proximal end arm 16a. Thus, the collecting chamber 48 can be moved within a range in which the arms 16a and 16b can rotate, and the exhaust path E can be made to follow the lateral movement of the lateral movement base portion 7. Thereby, even if the scattering prevention cover 4a exists in any position within the construction range, it is possible to reliably collect droplets of the adhesive R described later.

  The suction port 42a sucks out the splash of the adhesive R that has floated on the surface C1 of the structure C and floats inside the scattering prevention cover 4a, and keeps the inside of the scattering prevention cover 4a at a negative pressure during construction. This splash is collected by the dust collector 5. Thereby, even during construction, splashes of the adhesive R that has not been fixed on the surface C1 of the structure C are hardly scattered from the resin spraying device. The position at which the suction port 42a is provided in the anti-scattering cover 4a is not particularly limited, but it is desirable to provide the positional relationship so that the swirling flow F can be generated as described below.

  As shown in FIG. 4, the suction tube 42 in this example is provided so as to project at an angle of about 40 ° obliquely upward along the lower end portion of the upper conical portion of the scattering prevention cover 4 a. . As shown in FIG. 6A, the projecting direction of at least the root portion (connection portion with the anti-scattering cover 4a) of the suction tube 42 is such that the horizontal component of the axis A at the suction port 42a is the side surface portion. It is assumed to coincide with the horizontal tangent of the virtual plane X that is concentric with the inner peripheral surface of 43a.

  FIGS. 6B and 6C show another example in which the anti-scattering cover 4a has a cylindrical shape, and in FIG. 6B, the suction pipe 42 has a cylindrical side surface portion 43a. FIG. 6C shows a case where the suction tube 42 is provided on the upper end surface 43b of the cylindrical body as shown in FIG. In any case, as in this example, the horizontal component of the axis A at the suction port 42a coincides with the horizontal tangent of the virtual plane X concentric with the inner peripheral surface of the side surface 43a. Yes.

  By configuring the suction pipe 42 as described above, as shown in FIG. 4, the swirl flow F can be generated along the inner peripheral surface of the side surface portion 43a inside the scattering prevention cover 4a. Thus, it is possible to effectively suck out the splashes present in the inner space of the scattering prevention cover 4a.

  Here, the present invention is not limited to the case where the horizontal component of the axis A coincides with the horizontal tangent of the virtual plane X that is concentric with the inner peripheral surface of the side surface 43a as in this example. If the horizontal direction component is within the range of 80 ° to 95 ° starting from the radially outer side with respect to the radial direction D of the side surface portion 43a at the suction port 42a, the swirling flow F is Since it can be generated, it is allowed (see FIG. 4B). In other words, in other words, with the horizontal tangent of the virtual surface X as a reference, the horizontal component of the axis A at the suction port 42a is concentric with the inner peripheral surface of the side surface portion 43a. With respect to the tangent line, a deflection of 5 ° toward the radially inner side of the side surface portion 43a and 10 ° toward the outside of the same diameter is allowed.

  In this example, the suction pipe 42 protrudes only outside the scattering prevention cover 4a, but conversely, it may be provided only protruding inside the scattering prevention cover 4a, or inside the scattering prevention cover 4a. It is good also as what penetrates and the exterior.

  Even if the suction pipe 42 is provided as described above, the swirl flow F can be generated in the scattering prevention cover 4a. However, in the scattering prevention cover 4a of this example, as shown in FIG. 43 and an inner cylinder part 44 provided inside the outer cylinder part 43, and a suction port 42a is provided between the outer cylinder part 43 and the inner cylinder part 44. The guide blade 45 is provided between the outer cylinder portion 43 and the inner cylinder portion 44 and below the suction port 42a.

  The guide blade 45 is provided in parallel with the axis A of the suction port 42a of the suction tube 42. Since the guide vanes 45 are provided in this manner, the air in the anti-scattering cover 4a is guided to the guide vanes 45, so that the swirl flow F is more easily generated and the suction efficiency can be improved.

  In some cases, the horizontal direction component of the axis A at the suction port 42a does not satisfy the above condition with respect to the protruding direction of the root portion of the suction pipe 42 with respect to the anti-scattering cover 4a. A swirling flow F may be generated.

  In this example, as shown in FIG. 4 (B), the suction pipes 42 are provided four symmetrically with respect to the central axis (vertical virtual axis) of the scattering prevention cover 4a. That is, the suction pipe 42 is provided every 90 ° in the circumferential direction. By providing a plurality of suction pipes 42 in this manner, the above-described swirl flow F can be generated more effectively, and splashing of the splash can be performed more efficiently. The suction pipes 42 may be provided at two places (see FIG. 5) or at five or more places per one scattering prevention cover 4a.

  Here, the prior art related to this apparatus will be described. As such a resin spraying device for spraying a liquid resin on the surface of a structure, for example, there is an invention “Reinforcing agent spraying device for drainage pavement” described in JP-A-5-33310.

  The present invention provides a self-propelled tractor provided with a resin mixture spraying device and a cinnabar dust spraying device for mixing and spraying a resin liquid main agent and a curing agent, and a spray nozzle of both devices provided on a traverse stand of a traversing device. It is to provide. With this configuration, it is possible to prevent crushed stones from being peeled off and scattered on the pavement surface, and to obtain a drainage pavement that is excellent in drainage and sound absorption and also serves as a slip stopper.

  However, in this device, since the control of the self-propelled tractor and the control of each spraying device were not unified, it was difficult to perform construction with high accuracy. This device is for spraying resin or the like on the road, and no special measures are taken on the device itself to prevent scattering of resin or the like.

  On the other hand, depending on the construction site, it may be a problem if the resin is scattered around. For example, when construction is performed on the road surface in an airport facility, if resin is accidentally attached to the aircraft, there is a risk of serious danger in the operation of the aircraft, and there is a risk that the installer will be required to compensate. It was.

  Thus, in a construction place where the scattering of resin is severely restricted, a temporary wall must be provided around the construction range or a curing sheet must be laid around the construction area, which is inefficient. And since the above measures must be taken to the periphery of the original construction range, the daily work at the construction site may be affected.

  In order to solve such a problem, the resin spraying device used in the present invention includes a scattering prevention cover 4a having a suction port 42a opened, and the suction port 42a is an end portion of an exhaust passage E continuous to the dust collector 5. As a result, the splash (mist) of the adhesive R that has not fixed on the surface C1 of the structure C can be sucked out, and the splash can be collected by the dust collector 5. For this reason, the resin is not scattered as much as possible.

  Further, the resin spraying device used in the present invention is provided with a suction pipe 42 having an exhaust passage E, and the horizontal direction component of the axis A in the suction port 42a of the suction pipe 42 is the side surface in the suction port 42a. Since the angle θ with respect to the radial direction D of the portion 43a is in the range of 80 ° to 95 ° starting from the outside of the diameter, the swirl flow F can be generated inside the scattering prevention cover 4a, which is effective. It is possible to suck out the splashes present in the internal space of the splash prevention cover 4a.

  Alternatively, a suction pipe 42 having an exhaust path E is provided, and the horizontal component of the axis A at the suction port 42a of the suction pipe 42 is in the horizontal direction of the virtual plane X that is concentric with the inner peripheral surface of the side surface portion 43a. By matching with the tangent, the swirl flow F can be generated inside the scattering prevention cover 4a, and the splashes present in the inner space of the scattering prevention cover 4a can be sucked out effectively.

  Alternatively, since the suction pipe 42 is provided in two or more positions symmetrically with respect to the center axis of the anti-scattering cover 4a, it is possible to suck out the splash more efficiently.

  In addition to the above, the resin spraying device used in the present invention has a scattering prevention cover 4a having an outer cylindrical portion 43 and an inner cylindrical portion 44 provided inside the outer cylindrical portion 43, and the outer Between the cylindrical portion 43 and the inner cylindrical portion 44, a guide blade 45 is provided below the suction port 42a. The guide blade 45 is parallel to the axis A of the suction port 42a of the suction tube 42. By being provided, the air in the scattering prevention cover 4a is guided to the guide vanes 45 and the swirling flow F is more likely to be generated, and the suction efficiency can be increased.

  From the above, the resin spraying device used in the present invention can overcome the problems of the invention described in JP-A-5-33310.

  Next, a method for applying the adhesive R using the resin spraying apparatus according to this example will be described with reference to FIG. Although this apparatus can also be manually controlled, in order to realize a uniform amount of adhesive R applied in the method according to the present invention, normally, by a control pattern previously input to the control unit 3, Operation is automatically controlled (fully automatic program operation control).

  First, each part is adjusted before construction starts. Install this device manually at the construction start position. Then, the elevator handle 61 is rotated so that the left and right heights are adjusted so that the nozzle support rail 6 is parallel to the surface C1 of the structure C on which the uneven surface is formed as described above. Next, the link part 72 is moved up and down to adjust the height of the injection nozzle part 2 and the scattering prevention cover 4a. And the movement range of the injection nozzle part 2 on the nozzle support rail 6 in the left-right direction, that is, the start point and end point of the section where the adhesive R is injected is set. This setting is performed on the control unit 3 or by adjusting the position of a clamp or the like attached to the nozzle support rail 6.

  After adjusting each part as described above, automatic operation of the apparatus is started as shown in FIG. When the person in charge of operation presses the automatic operation start button provided in the control unit 3, the injection nozzle unit 2 starts to move from one end in the movement range in the left-right direction set in advance as described above. And stops at the other end (intervals W1, W3, W5 in FIG. 7 (W5 shows the way of movement), and the solid line in the figure shows the trajectory of the injection nozzle 2). The on-off valve 22 is opened only when the injection nozzle portion 2 moves as described above, and is closed when the injection nozzle 2 stops. While the on-off valve 22 is open, the adhesive R is injected from the injection port 21 toward the surface C1 of the structure C. In addition, the moving speed of the injection nozzle part 2 can be arbitrarily adjusted in the control part 3 according to the target application amount.

  The moving body portion 1 is stopped when the spray nozzle portion 2 moves as described above. Then, the moving body portion 1 moves forward after the injection nozzle portion 2 stops at the other end (sections B1 and B3 in FIG. 7, where the broken lines in the drawing indicate the locus of the injection nozzle 2). That is, the moving body 1 moves in the direction opposite to the range where the resin has already been sprayed. At this time, as shown in FIG. 3, the injection pattern SP1 of the injection nozzle 2 in the range where the resin has already been applied and the injection pattern SP2 in the range where the resin is applied next as described below are slightly different. The moving body part 1 moves forward so as to overlap, and the adhesive R can be uniformly distributed in the construction range. The overlap width OW at this time covers the decrease in the injection amount of the adhesive R at both ends in the front-rear direction with respect to the injection pattern SP of the injection nozzle 2, which is the injection width SW, and uniform injection in the front-rear direction. The distance is a quantity.

  After the moving body portion 1 moves forward as described above, the spray nozzle 2 moves from the other end to the one end at a constant speed in the opposite direction to the above, and the adhesive R is sprayed (section in FIG. 7). W2, W4). Then, the moving body unit 1 moves forward again (sections B2 and B4 in FIG. 7).

  The operation of the pattern is automatically repeated until the application of the adhesive R in the construction range is finished. As described above, this resin spraying device can be constructed over a wide range with high accuracy.

  In this example, the moving body unit 1 is controlled to stop when the injection nozzle unit 2 moves as described above. However, the moving body unit 1 and the injection nozzle unit are not limited thereto. It may be controlled so that 2 moves simultaneously and the adhesive R is spread in an oblique direction.

Here, Table 4 shows the adhesion strength of the cement mixture (concrete) overlaid on the existing concrete pavement specimen prepared according to the construction method according to the present invention. A specimen was prepared in a cylindrical shape in the same manner as described above, and the adhesion strength was calculated by measuring the load by tensile at both ends in the same manner as described above. When the surface of the existing concrete specimen is shot blasted (No. 1-2 in Table 4), the adhesion density is 1.0 to 1.5 MPa. On the other hand, when an epoxy adhesive is used together (No. 3-9 in Table 4), if the coating amount is 0.4 kg / m ² , only shot blasting (with the same projection density) can be used. 2.6 times, coating amount 0.7
In kg / m ² , it is 3 times when only shot blasting treatment (with the same projection density) is used. From this, the application amount is 0.4 kg / m ² or more, more preferably 0.7 kg / m. ^It can be seen that a sufficient adhesion strength can be obtained with ² or more. When the coating amount is 0.2 kg / m ² (No. 3 in Table 4), the adhesion strength is as small as 1.72 MPa, and even if an epoxy adhesive is used, there is almost no effect. In the case where the adhesive application operation is performed manually, it is difficult to apply the adhesive uniformly due to the individual differences of the operators, and it seems that sufficient adhesion strength cannot be obtained at locations where the application amount is partially small. When the coating amount is 0.7kg / m ² or more (No.5-9 in Table 4), the adhesion strength hardly changes even if the coating amount is increased. It is considered the limit of strength. On the contrary, it can be said that application of a large amount of adhesive more than necessary is costly and not beneficial. The coating amount is desirably 2.0 kg / m ² or less from the viewpoint of securing the film thickness when the sag occurs after application of the adhesive and the cost.

  Next, test construction was performed on an existing concrete pavement having a width of 3.5 m and an extension of 30 m. For the existing concrete pavement, expanded concrete with a mass ratio (W / B) of 39% of water to cement and expanded material was used, and the following construction was performed at an age of 8 months.

First, the surface of the existing concrete pavement is shot blasted at a projection density of 150 kg / m ² (No. 1-3 in Table 5), or the surface is cut 20 mm and shot blasted at a projection density of 150 kg / m ² (Table No. 4-6 in No. 5), an epoxy adhesive was applied using the above resin spraying device, and a cement mixture (concrete) was overlaid thereon. The overlay thickness was 50 mm for No. 1-3 in Table 5 and 70 mm for No. 4-6 in Table 5.

The overlayed cement mixture (concrete) is of the following two types. In Nos. 1-2 and 5-6 in Table 5, expanded concrete was used. The specifications are as follows.
Slump (just before driving): 6.5 ± 1.5cm, Air volume (just before driving): 4.5 ± 1.5%, W / B = 40%, s / a = 42.1%
Unit amount of each material (kg / m ³ ): W = 162kg, C = 385kg, EX = 20kg, S = 723kg, G = 1030kg
Design standard bending strength: 5.0 N / mm ²
(W: amount of water, C: amount of cement, EX: amount of expanded material, S: amount of fine aggregate, G: amount of coarse aggregate, W / B: ratio of water / cement / expanded material (mass ratio), s / a: Fine aggregate rate (volume ratio of fine aggregate to total aggregate)

In Table No. 3-4, plain concrete was used. The specifications are as follows.
Slump (just before driving): 6.5 ± 1.5cm, Air volume (just before driving): 4.5 ± 1.5%, W / C = 47%, s / a = 44.4%
Unit amount of each material (kg / m ³ ): W = 157kg, C = 334kg, S = 797kg, G = 1030kg
Design standard bending strength: 5.0 N / mm ²
(W: amount of water, C: amount of cement, S: amount of fine aggregate, G: amount of coarse aggregate, W / B: ratio of water / cement / expandable material (mass ratio), s / a: fine aggregate ratio (bone The volume ratio of fine aggregate to the whole material))

  As for the amount of adhesive applied, use a 150mm square polyethylene sheet with a non-woven fabric sheet, place this plate on the surface of the existing concrete pavement where the adhesive is to be applied (4 points each), and before and after application. The coating amount was calculated from the mass change, and the difference from the set amount was confirmed. However, this coating amount was not confirmed in Nos. 3 and 6 in Table 5.

The adhesion strength was calculated by cutting out a specimen having a diameter of 100 mm and a height of 90 mm (45 mm for the existing concrete part and 45 mm for the overlay part) from the construction site 8 months after the overlay, and measuring the load two months later. The load measurement was performed in the same manner as described above, and jigs were attached to both end portions in the axial direction of the specimen and pulled at a loading speed of 0.4 N / mm ² per minute in the axial direction. The maximum load measured in this way was divided by the cross-sectional area at the time of fracture to determine the bond strength.

  Table 5 shows the measurement results of the adhesive application amount and the adhesion strength. It can be seen that at any measurement location, the coating amount is close to the set value, and the adhesive can be uniformly sprayed by the resin spraying device, and sufficient adhesion strength can be obtained. Moreover, it turns out that the presence or absence of the cutting of the existing concrete pavement surface has little influence on adhesion strength.

  As described above, by applying the epoxy adhesive to the shot-blasted uneven surface by the method according to the present invention and overlaying the cement mixture under the condition that the difference in pulling force by the nut tension test of the bond is 5 N or less The adhesion strength of the cement mixture with the existing concrete can be greatly increased compared to the conventional method. In addition, the generation of concrete glass can be reduced as much as possible, and smooth construction is possible using a dedicated resin spraying device. As a result, it is possible to construct a new durable pavement integrated with existing concrete.

It is a side view which shows an example of the resin spraying apparatus used by this invention. It is a top view of the resin spraying apparatus. It is the schematic which shows the injection pattern of liquid resin in the resin spraying apparatus. The scattering prevention cover in the resin spraying apparatus is shown, (A) is a side view, (B) is a plan view. It is a perspective view which shows the scattering prevention cover which concerns on another example. It is the schematic which shows the positional relationship of the suction pipe of the scattering prevention cover in the said resin spraying apparatus, (A) is an example, (B) (C) is another example, Comprising: Is in plan view. It is explanatory drawing which shows the construction method using the said resin spraying apparatus, (A) is in a planar view, (B) is in a side view. It is a figure explaining the test body etc. which are used for the nut nut test of the bond of this invention. It is a figure which shows the procedure of the nut nut test of the bond of this invention. It is explanatory drawing of the test point of adhesion strength.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile body part 11 Drive wheel 2 Injection nozzle part 21 Injection port 3 Control part 4 Mist suction part 4a Spattering prevention cover 42 Suction pipe 42a Suction port 43 Outer cylinder part 43a Side surface part 44 Inner cylinder part 45 Guide vane 5 Dust collector 6 Nozzle support Rail 6a Support structure 7 Lateral movement base portion 72 Link portion 73 Nozzle support portion A Axis C Structure C1 Structure surface D Radial direction of side portion E Exhaust path R Liquid resin X Virtual surface θ Radial direction of side portion of axis Angle relative to

Claims (10)

An uneven surface is formed on the surface (C1) of the existing structure (C), an adhesive (R) is applied to the uneven surface, and a cement mixture is laid on the surface, whereby the cement mixture is placed on the existing concrete. An overlay method that can be laid in one piece,
An epoxy adhesive is used as the adhesive (R),
The above-mentioned epoxy adhesive has no decrease in strength in a 2 million times fatigue test under water-filled conditions, has a compressive strength of 50 MPa or more, a compressive elastic modulus of 1000 MPa or more, a bending strength of 35 MPa or more, and a tensile shear strength of 10 MPa or more. The residual tensile strength under the exposure conditions is 90% or more or the base material is destroyed,
An adhesion overlay method for an existing concrete pavement, characterized in that the coating amount on the uneven surface is 0.4 kg / m ² or more. After application of the adhesive (R) to the uneven surface, the cement mixture is laid under conditions where the adhesive (R) is in a semi-solid state,
The condition in which the adhesive (R) is in a semi-solidified state is a condition in which the pulling force difference between the front nut (Na) and the rear nut (Nb) is 5 N or less, assuming that a bond nut tensile test is performed. Yes,
The nut tension test of the above bond is
An adhesive application step of applying the adhesive (R) for the amount of application on the iron plate (P1) whose surface has been polished;
Immediately after the application step, a tip nut (Na), which is a nut galvanized with M6, is disposed so that the lower end surface is in contact with the adhesive (R) applied on the iron plate (P). A nut placement process;
Delayed from the leading nut arrangement step, a retrofit nut (Nb), which is another nut made of the same shape and material as the leading nut (Na), was applied onto the iron plate (P1). Post-attaching nut placement step for placing the lower end surface in contact with the adhesive;
After the post-nut mounting step, the pull-up force measurement for measuring the pull-up force required for peeling off the iron plate (P1) by pulling up the pre-attach nut (Na) and the post-nut (Nb). The adhesion overlay method of the existing concrete pavement according to claim 1, further comprising: a step.   The adhesion overlay method for an existing concrete pavement according to claim 1 or 2, wherein a mass ratio of the aggregate to the cement in the cement mixture is 0.7 or more and 8.0 or less. In applying the adhesive (R), a resin spraying device is used,
This resin spraying device includes a moving body part (1), an injection nozzle part (2), a control part (3), a mist suction part (4),
The moving body part (1) includes a drive wheel (11), and is movable in at least one direction on the surface (C1) of the structure (C).
The injection nozzle part (2) is provided at the end of the moving body part (1) in the moving direction, and can inject the adhesive (R) from the injection port (21). C) is parallel to the surface (C1) and is movable in a direction intersecting with the moving direction of the movable body part (1),
The control unit (3) controls the movement of the moving body unit (1) and the injection nozzle unit (2),
The mist suction part (4) has a scattering prevention cover (4a),
This scattering prevention cover (4a) covers the space between the injection port (21) of the injection nozzle part (2) and the surface (C1) of the structure (C),
The scattering prevention cover (4a) has a suction port (42a) opened, and the suction port (42a) is an end of an exhaust passage (E) continuous with the dust collector (5). The adhesion overlay method of the existing concrete pavement according to any one of claims 1 to 3. The drive wheel (11) of the resin spraying device is a set of two endless track rings (caterpillars) provided in parallel,
The moving body part (1) is provided with nozzle support rails (6, 6) so as to extend in a direction perpendicular to the moving direction of the moving body part (1).
This nozzle support rail (6, 6) is provided on the support structure (6a),
The support structure (6a) has a truss structure in which three horizontal structural members are arranged in a triangular shape in a longitudinal sectional view, and each horizontal structural member is connected by a truss member. ,
A laterally movable base portion (7) movable along the nozzle support rails (6, 6) is provided;
The lateral movement base portion (7) has a link portion (72) having a four-bar link structure, and a nozzle support portion (73) provided on the link portion (72) is vertically movable.
The method for adhering an existing concrete pavement according to claim 4, wherein the spray nozzle part (2) and the anti-scatter cover (4a) are attached to the nozzle support part (73). . The scattering prevention cover (4a) of the resin spraying device has a side surface portion (43a) in which the cross-sectional shape of the inner peripheral surface is circular,
A suction pipe (42) having the exhaust path (E) is provided integrally with the scattering prevention cover (4a),
The suction pipe (42) has the suction port (42a),
The horizontal direction component of the axis (A) at the suction port (42a) of the suction pipe (42) is an angle with respect to the radial direction (D) of the side surface portion (43a) at the suction port (42a) ( The adhesion overlay method for an existing concrete pavement according to claim 4 or 5, wherein θ) is in the range of 80 ° to 95 ° starting from the outside of the diameter. The scattering prevention cover (4a) of the resin spraying device has a side surface portion (43a) in which the cross-sectional shape of the inner peripheral surface is circular,
A suction pipe (42) having the exhaust path (E) is provided integrally with the scattering prevention cover (4a),
The suction pipe (42) has the suction port (42a),
The horizontal component of the axis (A) at the suction port (42a) of the suction pipe (42) matches the horizontal tangent of the virtual surface (X) that is concentric with the inner peripheral surface of the side surface (43a). The adhesion overlay construction method for an existing concrete pavement according to claim 4 or 5, characterized in that:   The existing pipe according to claim 4 or 5, characterized in that two or more suction pipes (42) of the resin spraying device are provided symmetrically with respect to the center axis of the scattering prevention cover (4a). Adhesive overlay method for concrete pavement. The scattering prevention cover (4a) of the resin spraying device has an outer cylinder part (43) and an inner cylinder part (44) provided inside the outer cylinder part (43).
The suction port (42a) is provided between the outer cylinder part (43) and the inner cylinder part (44),
Guide vanes (45) are provided between the outer cylinder part (43) and the inner cylinder part (44) and below the suction port (42a),
The guide vane (45) is provided in parallel with the axis (A) of the suction port (42a) of the suction pipe (42), according to any one of claims 6 to 8, Adhesive overlay method for existing concrete pavement. The injection nozzle part (2) of the resin spraying device starts moving from one end in the moving range and stops at the other end,
The adhesive (R) is jetted only during the movement of the jet nozzle (2),
The movable body part (1) stops during the movement of the injection nozzle part (2), and after the injection nozzle part (2) stops at the other end, a range in which the adhesive (R) has already been sprayed. Moves in the opposite direction,
The above-described operation is automatically and repeatedly controlled by a control pattern previously input to the control unit (3), and the overlay method for adhering an existing concrete pavement according to any one of claims 4 to 9 .