A method for in-situ repairing of a strip-shaped broken zone of a cement concrete pavement surface layer

Abstract

The application discloses a cement concrete pavement surface layer zonal fracture zone in-situ repairing method, a conversion platform and a cutting machine above the conversion platform. The conversion platform can cut the concrete surface layer under the action of the oblique control body. The slag blocking filter plate and the water storage cavity are arranged in the backfill area, the spray head connecting pipe, the oblique spray head and the transverse spray head are arranged on the water storage cavity, the cavity pressurizing pipe is arranged on the water storage cavity, the active biological filling body in the reinforcing vertical pipe can permeate into the first filling body to form the biological reinforcing body, the back pressure stay bar and the back pressure grouting pipe are arranged on the top of the first filling body, the oblique support pile and the transverse stay bar are arranged along the longitudinal direction of the backfill area, the interface anti-cracking layer is coated on the sidewall of the backfill area on the top of the first filling body, the dense pressurizing body and the supporting bag body below the protective cover plate apply the downward pressure to the arc-shaped pressing plate, and the deformation amount of the arc-shaped pressing plate can be controlled through the positioning pressing plate. The application can improve the pavement fracture zone treatment efficiency and enhance the overall structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of strip road surface broken zone disease treatment repair method suitable for active cement concrete pavement. BACKGROUND

[0002] During the use of active cement concrete pavement, different forms of pavement structure layer crushing often occur due to the influence of uneven subgrade soil and upper vehicle load. When there is a fill-dig interface in the subgrade or the setting of pavement slab separation joint is not reasonable, it often leads to strip cracks or slab crushing problems in the pavement structure layer. At present, when treating concrete pavement broken zone in engineering, the method of pouring concrete in situ after removing the broken zone concrete blocks is usually used. Although this method can solve the problem of broken zone treatment, it is difficult to accurately control the removal range of broken zone, enhance the overall strength of post-poured surface layer structure, block cracks at joint parts, and improve the flatness of the pavement. In view of this, in order to improve the quality and efficiency of in-situ repair of cement concrete pavement surface layer strip broken zone, a cement concrete pavement surface layer strip broken zone in-situ repair method is urgently needed, which can accurately control the treatment range of broken zone, enhance the overall strength of new and old pavement structure layer, avoid crack reflection at joint parts, and improve the flatness of pavement surface. SUMMARY

[0003] The purpose of the present application is to provide a cement concrete pavement surface layer strip broken zone in-situ repair method, which overcomes the shortcomings of existing repair methods, such as easy crack reflection at joint parts, overall enhancement of post-poured surface layer structure, and low flatness of pavement surface.

[0004] A cement concrete pavement surface layer strip broken zone in-situ repair method, characterized in that it comprises the following steps:

[0005] 1) Broken zone cutting: determine the position of the pavement cutting line on both sides of the concrete surface layer pavement broken zone, and extend the cutting line to 2-5 cm below the pavement base; lay a diagonal cutting platform on the upper surface of the concrete surface layer, and lay a cutting machine on the diagonal cutting platform, and control the cutting position of the cutting machine through a diagonal control body;

[0006] 2) backfill area surface erosion: remove the pavement broken material between the two pavement cutting lines, form the backfill area, arrange the slag filter plate at the bottom end of the suspension support rod, and set the water storage cavity between the two adjacent suspension support rods in the longitudinal direction, arrange the spray head connecting pipe on the two side surfaces and the bottom surface of the water storage cavity, and arrange two inclined spray heads and transverse spray heads on the spray head connecting pipe, set the cavity water supply pipe and the cavity pressurizing pipe on the top of the water storage cavity, and make the cavity water supply pipe and the cavity pressurizing pipe communicate with the external water supply equipment and the pressure gas bag respectively, wherein the initial pressure of the pressure gas bag is 0.1-0.3 MPa; set the closed cover plate at the top of the suspension support rod, and set the closed belt body between the closed cover plate and the concrete surface layer;

[0007] 3) first filling body construction: insert the reinforcing vertical pipe into the hole at the bottom end of the backfill area, when the first filling body is filled to the top elevation of the reinforcing vertical pipe, first pour the biological filling body into the inside of the reinforcing vertical pipe, make the biological filling body penetrate to the bottom of the backfill area through the guide hole slot on the reinforcing vertical pipe, form the biological reinforcing body, and then fill the first filling body in the upper part of the reinforcing vertical pipe, set the downward convex counter-pressure reinforcement on the upper surface of the first filling body, set the post-grouting pipe between the adjacent counter-pressure reinforcements in the longitudinal direction, and set the reinforcing connecting reinforcement on the upper surface of the counter-pressure reinforcement;

[0008] 4) inclined support pile and transverse reinforcement construction: drill two rows of mirror-symmetrical inclined holes along the longitudinal direction of the backfill area at uniform intervals, and pour concrete to form the inclined support pile; after the concrete pouring of the inclined support pile is completed, immediately press the T-shaped anchor reinforcement at the two ends of the transverse reinforcement into the inclined support pile from top to bottom;

[0009] 5) second filling body construction: brush the interface anti-cracking layer on the sidewall of the backfill area above the first filling body; the interface anti-cracking layer adopts cement mortar, the cement adopts Portland cement, and the phosphorus acid bacteria or nitrifying bacteria with a mass ratio of 0.2-3% to the cement is mixed in the cement mortar; first, set the arc-shaped pressing plate above the backfill area, and then pour the self-compacting concrete or prestressed concrete on the upper part of the first filling body and the counter-pressure reinforcement through the concrete pouring hole reserved on the arc-shaped pressing plate to form the second filling body; subsequently, set the protective cover plate above the arc-shaped pressing plate, and set the dense pressurizing body between the protective cover plate and the positioning pressing plate on the upper surface of the arc-shaped pressing plate, set two support bag bodies parallel to the longitudinal direction of the backfill area on the two sides of the dense pressurizing body, and blow fill the medium-coarse sand into the support bag bodies to form the blow-fill support body; pressurize the dense pressurizing body through the external pressurizing device to apply downward pressure to the arc-shaped pressing plate and the second filling body; before the initial setting of the second filling body, inject the micro-expanding concrete into the first filling body through the post-grouting pipe to form the joint dense body.

[0010] Step 1) the pavement cutting line is symmetrically arranged on both sides of the pavement broken zone, and the inclination angle is 45-60°; the inclined cutting platform comprises a platform bottom plate, an inclined position control body and a conversion platform; the inclined position control body adopts a hydraulic jack, and four thereof are arranged in parallel on the platform bottom plate in a rectangular shape, and the inclination angle thereof is parallel to the pavement cutting line.

[0011] Step 2) the slag blocking filter plate is rolled from a steel plate, two closed side plates rolled from rubber sheets are connected on both sides of the slag blocking filter plate, and a slag storage groove is arranged at the lower part of the slag blocking filter plate; the inclined spray head and the transverse spray head both adopt water-saving spray heads; the water storage cavity adopts a steel plate to be rolled into a closed cylindrical body shape or an elliptical cylinder or a cuboid shape or a combination of a circular shape and a rectangular shape; the pressure air bag adopts a rubber sheet to be sewn into a closed cavity; and the closed belt body is cut from a rubber sheet or a geotextile material.

[0012] Step 3) the first filling body adopts light-weight concrete with a density of 1.1-1.5 g / cm 3 ; the reinforcing vertical pipe is rolled from a steel pipe, a lead hole is inserted into a pavement base layer, and 2-3 guide hole grooves are arranged at the upper part of the reinforcing vertical pipe; the guide hole grooves are circular or elliptical or rectangular, and 2-3 thereof are arranged in each row; the biological filling body adopts cement mortar improved by phosphorus bacteria or nitrifying bacteria, and 0.2-3% of the phosphorus bacteria or nitrifying bacteria by mass of cement is mixed into the cement mortar; and the anti-drawing reinforcement is rolled from a steel plate or a threaded steel bar and is welded and connected with the counter-pressure bracing rib.

[0013] Step 4) the inclined bracing pile adopts concrete material, the strength grade is 1-2 higher than that of the concrete surface layer 1, and the included angle with the horizontal plane is 45-60°; and the transverse tension rib is rolled from a steel plate or a steel bar and is vertically welded and connected with the T-shaped anchor rib at both ends.

[0014] Step 5) the arc-shaped pressing plate 36 is rolled from a steel plate with a thickness of 0.5-2 mm into an arc shape with an upper convexity, and the upper surface is welded and connected with a positioning pressing plate; the positioning pressing plate is rolled from a steel plate with a thickness of 3-5 mm into a width of 20-50 cm; the protective cover plate is rolled from a steel plate with a thickness of 3-5 mm into an arc shape with an upper convexity, and the two side edges are firmly connected with the concrete surface layer through anchor nails.

[0015] The application has the advantages that the application can accurately control the treatment range of the broken zone of the cement concrete pavement, enhance the integrity of the new and old pavement structure layers, avoid crack reflection at the joint part, and improve the surface flatness of the pavement. The conversion platform and the cutting machine thereon can cut the concrete surface layer along the oblique pavement cutting line under the action of the oblique control body, realize the cutting guide control of the edge line of the backfill area, and set the slag blocking filter plate and the water storage cavity in the backfill area, and distribute the spray head connecting pipe, the oblique spray head and the transverse spray head on the water storage cavity, realize the multi-directional combined flushing of the backfill area and the rapid collection of the flushing sundries, set the cavity pressurizing pipe on the water storage cavity, automatically pressurize the water in the water storage cavity, improve the flushing pressure of the oblique spray head and the transverse spray head, and the active biological filler in the reinforcing vertical pipe can penetrate into the first filler at the bottom of the backfill area, form a biological reinforcing body, improve the sealing effect of the bottom of the first filler, and block the crack reflection at the bottom. Meanwhile, the reverse pressure stay bar on the upper surface of the first filler is downwardly protruding, and when the post grouting pipe is grouted, the reverse pressure stay bar can provide a reverse pressure to the post grouting pipe, and the stability of the post grouting pipe is enhanced. The reinforcing connecting bar is arranged on the upper surface of the reverse pressure stay bar, which is helpful to enhance the integrity of the first filler and the second filler. The oblique support pile and the transverse stay bar are arranged along the longitudinal direction of the backfill area, which can enhance the connection strength between the second filler and the concrete surface layer. The interface anti-cracking layer is coated on the side wall of the backfill area at the upper part of the first filler, and the phosphoric acid bacteria or nitrifying bacteria are mixed in the cement mortar of the interface anti-cracking layer, which can improve the anti-cracking performance of the interface anti-cracking layer through the action of the biological enzyme. The interface anti-cracking layer is coated on the side wall of the backfill area at the upper part of the first filler, and the phosphoric acid bacteria or nitrifying bacteria are mixed in the cement mortar of the interface anti-cracking layer, which can improve the anti-cracking performance of the interface anti-cracking layer through the action of the biological enzyme. The dense pressurizing body and the supporting bag body below the protective cover plate can exert a downward pressure on the arc-shaped pressure plate, and the positioning pressure plate can control the deformation amount of the arc-shaped pressure plate, so that the second filler is rapidly pressurized and densified, and the influence of the hardening deformation of the second filler on the flatness of the pavement is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a flow chart of the in-situ repair of the strip broken zone of the cement concrete pavement surface layer of the application;

[0017] Figure 2 is Figure 1 a cutting schematic diagram of the strip broken zone of the cement concrete pavement surface layer;

[0018] Figure 3 is Figure 1 a flushing construction schematic diagram of the backfill area;

[0019] Figure 4 is Figure 1 a schematic diagram of the in-situ repair structure of the strip broken zone of the cement concrete pavement surface layer;

[0020] Fig. 1: 1-concrete surface layer; 2-pavement broken zone; 3-pavement cutting line; 4-pavement base layer; 5-oblique cutting platform; 6-cutter; 7-oblique control body; 8-platform bottom plate; 9-conversion platform; 10-backfill area; 11-suspension support rod; 12-slag blocking filter plate; 13-water storage cavity; 14-sprinkler connecting pipe; 15-oblique sprinkler; 16-transverse sprinkler; 17-cavity water supply pipe; 18-cavity pressurizing pipe; 19-water supply equipment; 20-pressure air bag; 21-closed cover plate; 22-closed belt body; 23-first filling body; 24-biologic filling body; 25-biologic filling body; 26-closed side plate; 27-guiding hole groove; 28-biologic reinforcing body; 29-counter-pressure reinforcing rib; 30-post-pressure grouting pipe; 31-reinforcing connecting rib; 32-oblique support pile; 33-transverse reinforcing rib; 34-T-shaped anchoring rib; 35-interface anti-cracking layer; 36-arc-shaped pressing plate; 37-second filling body; 38-protection cover plate; 39-positioning pressing plate; 40-dense pressing body; 41-slag storage groove; 42-supporting bag body; 43-blowing and filling supporting body; 44-joint densification body. DETAILED DESCRIPTION

[0021] The embodiments of the structure of the present application will be described in detail with reference to the accompanying drawings:

[0022] A method for repairing a cement concrete pavement surface layer strip broken zone in situ, comprising the following steps:

[0023] 1) Broken zone cutting: The position of the pavement cutting line 3 is determined on both sides of the pavement broken zone 2 of the concrete surface layer 1, and the cutting line is extended to 2-5 cm below the pavement base layer 4; the oblique cutting platform 5 is arranged on the upper surface of the concrete surface layer 1, and the cutter 6 is arranged on the oblique cutting platform 5, and the cutting position of the cutter 6 is controlled by the oblique control body 7;

[0024] 2) Surface flushing of backfill area: The pavement broken material between the two pavement cutting lines 3 is removed to form the backfill area 10; the slag blocking filter plate 12 is arranged at the bottom end of the suspension support rod 11, and the water storage cavity 13 is arranged between two longitudinally adjacent suspension support rods 11; the sprinkler connecting pipe 14 is arranged on both sides and the bottom of the water storage cavity 13, and two oblique sprinklers 15 and transverse sprinklers 16 are arranged on the sprinkler connecting pipe 14; the cavity water supply pipe 17 and the cavity pressurizing pipe 18 are arranged on the top of the water storage cavity 13, and the cavity water supply pipe 17 and the cavity pressurizing pipe 18 are respectively communicated with the external water supply equipment 19 and the pressure air bag 20, wherein the initial pressure of the pressure air bag 20 is 0.1-0.3 MPa; the closed cover plate 21 is arranged at the top of the suspension support rod, and the closed belt body 22 is arranged between the closed cover plate 21 and the concrete surface layer 1;

[0025] 3) First filling body construction: Reinforced vertical pipe 24 is inserted into the hole at the bottom of the backfill area. After the first filling body 23 is filled to the top of the reinforced vertical pipe 24, the inside of the reinforced vertical pipe 24 is first filled with biological filling body 25, which penetrates the bottom of the backfill area through the guide hole slot 27 on the reinforced vertical pipe 24 to form a biological reinforcement body 28, and then the first filling body 23 above the reinforced vertical pipe 24 is filled. The reverse pressure bar 29 is arranged on the upper surface of the first filling body 23, and the back pressure grouting pipe 30 is arranged between the adjacent reverse pressure bars 29 in the longitudinal direction, and the reinforcing bar 31 is arranged on the upper surface of the reverse pressure bar 29.

[0026] 4) Inclined support pile and transverse reinforcement construction: Two rows of mirror-symmetrical inclined holes are uniformly spaced along the longitudinal direction of the backfill area 10, and concrete is poured to form inclined support piles 32. After the concrete pouring of the inclined support piles 32 is completed, the T-shaped anchor bars 34 at both ends of the transverse reinforcement 33 are immediately pressed into the inclined support piles 32 from top to bottom.

[0027] 5) Second filling body construction: The interface crack prevention layer 35 is applied to the sidewall of the backfill area above the second filling body. The interface crack prevention layer 35 uses cement mortar, the cement uses Portland cement, and the cement mortar is mixed with 0.2-3% of phosphorus acid bacteria or nitrifying bacteria by mass. An arc-shaped pressing plate 36 is arranged above the backfill area, and self-compacting concrete or prestressed concrete is poured into the upper part of the first filling body 23 and the reverse pressure bar 29 through the reserved concrete pouring hole on the arc-shaped pressing plate 36 to form the second filling body 37. Then, a protective cover plate 38 is arranged above the arc-shaped pressing plate 36, and a dense pressure body 40 is arranged between the protective cover plate 38 and the positioning pressing plate 39 on the upper surface of the arc-shaped pressing plate 36. Two support bag bodies 42 are arranged on both sides of the dense pressure body 40 parallel to the longitudinal direction of the backfill area, and medium-coarse sand is blown into the support bag bodies to form a blown filling support body 43. The dense pressure body is pressurized by an external pressure device to apply downward pressure to the arc-shaped pressing plate 36 and the second filling body 37. Before the initial setting of the second filling body 37, micro-expanding concrete is injected into the first filling body 23 through the back pressure grouting pipe 30 to form a joint dense body 44.

[0028] Embodiment 1: A method for repairing a strip-shaped broken zone of a cement concrete pavement surface layer in situ, characterized in that it comprises the following steps:

[0029] The thickness of the concrete surface layer 1 is 25 cm, and the concrete with a strength grade of C30 is poured. The true joint interval is 6 m.

[0030] The width of the pavement broken zone 2 is 40 cm.

[0031] The angle between the pavement cutting line 3 and the horizontal plane is 60°, and the pavement cutting line 3 extends 5 cm below the pavement base 4. The pavement base 4 uses a cement stabilized gravel base.

[0032] An oblique cutting platform 5 is installed on the upper surface of the concrete surface layer 1. The oblique cutting platform 5 includes a platform base plate 8, an oblique control body 7, and a conversion platform 9. The platform base plate 8 and the conversion platform 9 are both made of steel plates with a thickness of 10mm.

[0033] The inclined control body 7 uses a hydraulic jack with a stroke of 30cm. Four of them are arranged in a rectangle on the platform base plate 8 and are parallel to each other. Their inclined angle is parallel to the road cutting line 3.

[0034] Remove the broken road material between the two road surface cutting lines 3 to form a backfill area 10 with a bottom width of 30cm.

[0035] The suspension strut 11 is made of H-beam steel with specifications of 244×175×7×11. A slag-blocking filter plate 12 is installed at the bottom of the suspension strut 11. The slag-blocking filter plate 12 is made of steel plate with a thickness of 2mm. Two closed side plates 26 made of rubber sheet are welded to both sides of the slag-blocking filter plate 12. The closed side plates 26 are made of rubber sheet with a thickness of 1mm and are bonded to the slag-blocking filter plate 12. A slag storage tank 41 is set at the bottom of the slag-blocking filter plate 12. The slag storage tank 41 has a depth of 5cm and a width of 10cm.

[0036] A water storage cavity 13 is provided between two longitudinally adjacent suspension struts 11. The water storage cavity 13 is made of steel plate with a thickness of 2mm and rolled into a closed elliptical cylinder shape. Sprayer connecting pipes 14 are respectively arranged on the two sides and the bottom of the water storage cavity 13. The sprayer connecting pipes 14 are made of steel pipe with a diameter of 60mm and are connected to the water storage cavity 13. Two oblique sprayers 15 and a horizontal sprayer 16 are arranged on the sprayer connecting pipes 14. Both the oblique sprayers 15 and the horizontal sprayers 16 are water-saving sprayers. A cavity water supply pipe 17 and a cavity pressurization pipe 18 are provided at the top of the water storage cavity 13. Both the cavity water supply pipe 17 and the cavity pressurization pipe 18 are made of steel pipe with a diameter of 60mm. The cavity water supply pipe 17 and the cavity pressurization pipe 18 are respectively connected to the external water supply equipment 19 and the pressure bladder 20. The initial pressure of the pressure bladder 20 is 0.2 MPa, and the water supply equipment 19 uses a water pump with a head of 20 m.

[0037] A closed cover plate 21 is installed at the top of the suspension strut. The closed cover plate 21 is made of steel plate with a thickness of 2mm. A closed strip 22 is installed between the closed cover plate 21 and the concrete surface layer 1. The closed strip 22 is made of rubber sheet with a thickness of 2cm.

[0038] A reinforcing vertical pipe 24 is inserted into the bottom hole of the backfill area 10. The reinforcing vertical pipe 24 is made of steel pipe with a diameter of 100mm. Two guide slots 27 are set on the upper part of the reinforcing vertical pipe. The guide slots 27 have a diameter of 50mm and three are arranged in each slot.

[0039] The first filling body 23 adopts large-void lightweight concrete with a density of 1.3 g / cm3; when the first filling body 23 is filled to the top elevation of the reinforced vertical pipe 24, the interior of the reinforced vertical pipe 24 is first injected with a biological filling body 25; the biological filling body 25 adopts cement mortar improved by phosphorus bacteria, and 0.53% of phosphorus bacteria by mass of cement is mixed into the cement mortar. The biological filling body 25 penetrates to the bottom of the backfill area through the guide hole and groove 27 on the reinforced vertical pipe 24, and forms a biological reinforcement 28.

[0040] A downward convex counter-pressure rib 29 is arranged on the upper surface of the first filling body 23, a post-grouting pipe 30 is arranged between longitudinally adjacent counter-pressure ribs 29, and a reinforcing tie 31 is arranged on the upper surface of the counter-pressure rib 29; the counter-pressure rib 29 is rolled from a steel plate with a thickness of 10 mm, has a width of 10 cm and a chord height of 2 cm; the post-grouting pipe 30 has a diameter of 60 mm; and the reinforcing tie 31 has a T-shaped cross section and is rolled from a steel plate with a thickness of 10 mm and a width of 3 cm.

[0041] Two rows of mirror-symmetrical oblique holes are evenly spaced and drilled along the longitudinal direction of the backfill area 10, and are filled with concrete to form oblique support piles 32; the oblique support piles 32 have a diameter of 50 mm and a concrete strength grade of C50; after the concrete of the oblique support piles 32 is injected, T-shaped anchor bars 34 at both ends of a transverse tension bar 33 are immediately pressed into the oblique support piles 32 from top to bottom; the T-shaped anchor bars 34 are rolled from a steel plate with a thickness of 10 mm and a width of 3 cm.

[0042] An interface anti-cracking layer 35 is applied to the sidewall of the backfill area on the upper part of the first filling body; the interface anti-cracking layer 35 adopts cement mortar, the cement of which is portland cement, and 0.5% of phosphorus bacteria by mass of cement is mixed into the cement mortar.

[0043] An arc-shaped pressing plate 36 is first arranged above the backfill area, and then self-compacting concrete with a strength grade of C35 is cast on the upper part of the first filling body 23 and the counter-pressure rib 29 through a concrete injection hole reserved on the arc-shaped pressing plate 36 to form a second filling body 37; the arc-shaped pressing plate 36 is rolled from a steel plate with a thickness of 0.5 mm.

[0044] A protective cover plate 38 is arranged above the arc-shaped pressing plate 36; the protective cover plate 38 is rolled from a steel plate with a thickness of 3 mm, has an upward convex arc shape, and is firmly connected to the concrete surface layer 1 through anchor nails at both sides.

[0045] A compacting and pressing body 40 is arranged between the protective cover plate 38 and a positioning pressing plate 39 on the upper surface of the arc-shaped pressing plate 36; the compacting and pressing body 40 adopts a hydraulic jack and is connected to an external pressing device.

[0046] Two support bag bodies 42 are arranged on both sides of the compacted pressure body 40 in parallel to the longitudinal direction of the backfill area, and the support bag bodies 42 are made of geotextile bags; medium-coarse sand is blown into the support bag bodies to form blown-fill support bodies 43.

[0047] The first filling body 23 is injected with micro-expansion concrete with a strength grade of C35 through the post-grouting pipe 30 to form a joint compacted body 44.

[0048] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. The structure described in the present application file and the drawings is only an embodiment of the assembled bridge pier, and the bridge pier assembled by the combination of the adjusting section, the standard section and the pier cap section is within the protection scope of the present application. For ordinary skilled persons in the technical field to which the present application belongs, a number of equivalent substitutions or obvious variations can be made without departing from the concept of the present application, and the performance or use is the same, which should be considered as belonging to the protection scope determined by the claims submitted by the present application.

Claims

1. A method for in situ repair of a cement concrete pavement surface strip of a band of crushing, characterized in that, It comprises the following steps: 1) Breaking zone cutting: the position of the pavement cutting line (3) is determined on both sides of the pavement breaking zone (2) of the concrete surface layer (1), and the cutting line is extended to 2-5 cm below the pavement base (4); an inclined cutting platform (5) is arranged on the upper surface of the concrete surface layer (1), and a cutting machine (6) is arranged on the inclined cutting platform (5), and the cutting position of the cutting machine (6) is controlled by an inclined control body (7); 2) Surface flushing of backfill area: the pavement breaking material between the two pavement cutting lines (3) is removed to form a backfill area (10), a slag blocking filter plate (12) is arranged at the bottom end of a suspension support rod (11), a water storage cavity (13) is arranged between two longitudinally adjacent suspension support rods (11), a spray head connecting pipe (14) is arranged on the two side surfaces and the bottom surface of the water storage cavity (13), two inclined spray heads (15) and a horizontal spray head (16) are arranged on the spray head connecting pipe (14), a cavity water supply pipe (17) and a cavity pressurizing pipe (18) are arranged on the top of the water storage cavity (13), and the cavity water supply pipe (17) and the cavity pressurizing pipe (18) are respectively communicated with an external water supply device (19) and a pressure gas bag (20), wherein the initial pressure of the pressure gas bag (20) is 0.1-0.3 MPa; a closed cover plate (21) is arranged on the top of the suspension support rod (11), and a closed belt body (22) is arranged between the closed cover plate (21) and the concrete surface layer (1); 3) First filling body construction: a reinforcing vertical pipe (24) is inserted into the hole at the bottom end of the backfill area, after the first filling body (23) is filled to the top elevation of the reinforcing vertical pipe (24), the interior of the reinforcing vertical pipe (24) is first poured with a biological filling body (25), the biological filling body (25) is a cement mortar improved by phosphorus bacteria or nitrifying bacteria, the biological filling body (25) penetrates to the bottom of the backfill area through the guide hole slot (27) on the reinforcing vertical pipe (24) to form a biological reinforcing body (28), and then the first filling body (23) above the reinforcing vertical pipe (24) is filled, a downward convex counter-pressure stay bar (29) is arranged on the upper surface of the first filling body (23), a post-grouting pipe (30) is arranged between the longitudinally adjacent counter-pressure stay bars (29), and a reinforcing tie bar (31) is arranged on the upper surface of the counter-pressure stay bar (29); 4) Inclined support pile and horizontal tie bar construction: two rows of mirror-symmetrical inclined holes are drilled along the longitudinal direction of the backfill area (10) at uniform intervals, and concrete is poured to form inclined support piles (32); after the concrete pouring of the inclined support piles (32) is completed, the T-shaped anchor bars (34) at both ends of the horizontal tie bars (33) are immediately pressed into the inclined support piles (32) from top to bottom; 5) The second filling body construction: the interface anti-cracking layer (35) is painted on the sidewall of the backfill area of the upper part of the first filling body; the interface anti-cracking layer (35) uses cement mortar, the cement uses Portland cement, and the cement mortar is mixed with 0.2-3% of phosphorus acid bacteria or nitrifying bacteria by mass; an arc-shaped pressing plate (36) is arranged above the backfill area, and self-compacting concrete or prestressed concrete is poured into the upper part of the first filling body (23) and the counter-pressure reinforcing bar (29) through the reserved concrete pouring hole of the arc-shaped pressing plate (36), so that the second filling body (37) is formed; then a protective cover plate (38) is arranged above the arc-shaped pressing plate (36), a compacting pressure body (40) is arranged between the protective cover plate (38) and the positioning pressing plate (39) on the upper surface of the arc-shaped pressing plate (36), two support bag bodies (42) are arranged on both sides of the compacting pressure body (40) and are parallel to the longitudinal direction of the backfill area, and medium-coarse sand is blown into the support bag bodies to form a blown filling support body (43); the compacting pressure body is pressurized by an external pressurizing device, and downward pressure is applied to the arc-shaped pressing plate (36) and the second filling body (37); before the initial setting of the second filling body (37), micro-expansive concrete is injected into the first filling body (23) through the back-pressure grouting pipe (30) to form a joint compacting body (44).

2. The method for in situ repair of a cement concrete pavement surface strip of a broken strip according to claim 1, characterized in that: In step 1, the pavement cutting line (3) is symmetrically arranged on both sides of the pavement broken zone (2) in mirror image, and the inclination angle is 45-60°; the inclined cutting platform (5) comprises a platform bottom plate (8), an inclined control body (7) and a conversion platform (9); the inclined control body (7) is arranged in a rectangle on the platform bottom plate (8) and is parallel to each other, and the inclination angle is parallel to the pavement cutting line (3).

3. The method for in situ repair of a cement concrete pavement surface strip of a broken strip according to claim 2, characterized in that: In step 2, the slag blocking filter plate (12) is made of a steel plate, two closed side plates (26) made of rubber sheets are connected to both sides of the slag blocking filter plate (12), and a slag storage groove (41) is arranged at the lower part of the slag blocking filter plate (12); the inclined nozzle (15) and the transverse nozzle (16) are both water-saving nozzles; the water storage cavity (13) is made of a steel plate and is in the shape of a closed cylinder, an elliptical cylinder, a rectangular prism or a combination of a circle and a rectangle; the pressure air bag (20) is made of a rubber sheet and is in the shape of a closed cavity; the closed belt body (22) is cut from a rubber sheet or a geotextile material.

4. The method for in situ repair of a cement concrete pavement surface strip of a broken strip according to any one of claims 1 to 3, characterized in that: The first filling body (23) in step 3) adopts large-void lightweight concrete with a density of 1.1-1.5 g / cm 3 ; the reinforcing vertical pipe (24) is rolled from a steel pipe, is inserted into the pavement base (4), and is provided with 2-3 guide hole grooves (27) at the upper part of the reinforcing vertical pipe; the guide hole grooves (27) are circular, elliptical or rectangular, and 2-3 are arranged in each row; the biological filling body (25) adopts cement mortar improved by phosphorus bacteria or nitrifying bacteria, and 0.2-3% of the phosphorus bacteria or nitrifying bacteria is mixed in the cement mortar in terms of the mass ratio of cement; and the reinforcing tie (31) is rolled from a steel plate or a threaded steel bar and is welded to the counter-pressure tie (29).

5. The method for in situ repair of a cement concrete pavement surface strip of a broken strip according to claim 3, characterized in that: In step 4, the inclined supporting pile (32) is made of concrete material, the strength grade is 1-2 higher than that of the concrete surface layer 1, and the included angle with the horizontal plane is 45-60°; the transverse reinforcing bar (33) is made of a steel plate or a reinforcing bar and is vertically welded and connected to the T-shaped anchor bar (34) at both ends.

6. The method for in situ repair of a cement concrete pavement surface strip of a broken strip according to claim 5, characterized in that: In step 5, the arc-shaped pressing plate (36) is made of a steel plate with a thickness of 0.5-2 mm and is in the shape of an upper convex arc, and the upper surface is welded and connected to the positioning pressing plate (39); the positioning pressing plate (39) is made of a steel plate with a thickness of 3-5 mm and is in the shape of a rectangular prism with a width of 20-50 cm; the protective cover plate (38) is made of a steel plate with a thickness of 3-5 mm and is in the shape of an upper convex arc, and the two side edges are firmly connected to the concrete surface layer (1) by anchor nails.

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