A gravity dam crack reinforcement construction process

Abstract

The application relates to the technical field of gravity dam crack repair, in particular to a gravity dam crack reinforcing construction process, which comprises the following steps: S1, construction preparation; S2, jointing and drilling construction; S3, flushing and checking construction; S4, grouting pipe installation and fixation; S5, joint sealing construction, in which epoxy mortar is used to fill the cracks; S6, slurry preparation and grouting construction, in which slurry is prepared after the epoxy mortar construction lasts for 24 hours, and a grouting pump is used for grouting construction; S7, joint pulling device installation, in which a joint pulling device is installed in a construction groove to balance stress; and S8, construction groove plugging, in which the construction groove is chiseled and cleaned, and then filled with concrete mortar. The application has the effect of reducing the re-cracking of gravity dam cracks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gravity dam crack repair, in particular to a gravity dam crack reinforcement construction process. BACKGROUND

[0002] At present, with the development of economic construction, the investment and construction of water conservancy projects in China are increasing, and the design standards of water conservancy projects are also increasing. Among them, the concrete gravity dam can pass through the dam body to discharge or take water, which saves the special discharge and water taking buildings, and is easy to construct diversion and construction flood control, and has good safety, so it is widely constructed and used. Because there is a weak layer between the anti-seepage layer and the concrete layer of the concrete dam, and between the pouring layers of the anti-seepage layer, water erosion, seasonal change thermal expansion and cold contraction, etc. can easily induce structural cracks. The vertical continuous cracks are most likely to form at 1 / 2 to 1 / 3 of each dam section perpendicular to the water flow direction. Once such cracks penetrate the concrete anti-seepage layer, a water seepage channel will be formed. Therefore, how to repair and reinforce has become an important issue in the field of water conservancy engineering research.

[0003] In the prior art, after the gravity dam appears cracks, it needs to be treated by crack pouring. The crack pouring treatment needs the following steps: first, drilling drilling, after drilling is completed, the drilling is flushed, after flushing is completed, the chemical grouting nozzle is installed for chemical grouting.

[0004] In the process of implementing the present application, the inventors found that in the prior art, at least the following problems exist. Some cracks have mutual tension away from each other. The cracks completed by chemical grouting are continuously affected by tension after being put into use, which is easy to cause the cracks to crack again. SUMMARY

[0005] In order to reduce the crack of the gravity dam after repair, the present application provides a gravity dam crack reinforcement construction process.

[0006] The gravity dam crack reinforcement construction process provided by the present application adopts the following technical scheme:

[0007] A gravity dam crack reinforcement construction process, comprising the following steps:

[0008] S1, construction preparation, grouting material, equipment arrangement and preparation, drilling point arrangement;

[0009] S2, chisel drilling construction, drilling a construction slot along the gravity dam crack, then cleaning the construction slot, and drilling according to the point using the air drill;

[0010] S3, flushing and inspection construction, after the drilling construction is completed, high-pressure water is used to clean the drilling, so that the powder and other impurities in the drilling are cleaned;

[0011] S4, grouting pipe installation and fixation, after the drilling and its surrounding are cleaned, the grouting pipe is installed in the drilling, and then epoxy is applied and fixed;

[0012] S5, crack sealing construction, cracks in the gravity dam are blown clean using wind and water alternation, and then the cracks are filled solidly using epoxy mortar;

[0013] S6, grouting construction, after the epoxy mortar construction for 24 hours, the slurry is configured, and the grouting pump is used for grouting construction;

[0014] S7, joint pulling device installation, the joint pulling device is installed in the construction groove to balance the stress;

[0015] S8, construction groove sealing, the construction groove is chiseled and cleaned, and then the concrete mortar is filled.

[0016] By adopting the above technical scheme, when the crack construction is carried out, the materials and equipment are first arranged, then the drilling interval is selected according to the actual width and depth of the crack, then the point is placed, then the crack surface is broken and drilled to form a construction groove convenient for construction, then the construction groove is cleaned, and the hole is drilled according to the point, then the drilling is cleaned with high-pressure wind and high-pressure water, and the powder generated by the drilling and the gravel in the hole are cleaned; then the grouting pipe is inserted into the drilling, and then the grouting pipe is fixed with epoxy; then the cracks are cleaned with high-pressure water and high-pressure wind alternately, and then the communication between the construction groove and the cracks is sealed with epoxy; after the epoxy mortar construction for 24 hours, the grouting liquid is configured, and then the grouting pump is used for grouting operation, after the grouting is completed, the joint pulling device is installed in the construction groove, and the joint pulling device is fastened, so that the cracks have the trend of joint, and then the grouting mortar is more dense, and at the same time, the cracks can be tensioned to a certain extent, so that the probability of re-cracking is reduced; then the construction groove is chiseled and cleaned, and then the concrete mortar is filled; the above process steps can make the crack grouting more dense, and the crack is tensioned all the time, which can reduce the re-cracking of the crack and improve the construction effect.

[0017] Optionally, in step S2, the positions of the drillings are drilled on both sides of the construction groove, and the drillings are inclined to the direction close to the cracks.

[0018] By adopting the above technical scheme, the positions of the drillings are constructed on both sides of the construction groove, which is convenient for finding hidden cracks, and the staggered drillings can increase the coverage of grouting, thereby reducing the probability of hidden cracks on the first floor, and thereby improving the grouting effect and the repair effect of the cracks.

[0019] Optionally, in step S6, after the grouting construction is completed, secondary drilling is performed, the position of the secondary drilling is located between the primary drilling and the construction slot, and secondary grouting is performed.

[0020] By adopting the above technical scheme, the first drilling grouting is used to grout the relatively deep cracks, so that the hidden cracks overflow from the lower part to the upper part, and the hidden cracks can be fully filled. The secondary drilling is performed, the angle of the drilling is large, the drilling of this time is in communication with the upper space of the cracks, the upper hidden cracks are grouted during the secondary grouting, and the staggered grouting positions can increase the coverage of grouting, further reduce the hidden cracks, reduce the probability of water accumulation in the cracks, and further reduce the probability of crack reopening, thereby improving the stability of the gravity dam.

[0021] Optionally, in step S7, the crack pulling device comprises a fixing part and a tensioning assembly, a plurality of fixing parts are arranged on the side wall of the construction slot, and the two ends of the tensioning assembly are connected to the fixing parts on the two sides of the cracks, respectively. The tensioning assembly drives the two ends of the fixing part to move close to each other.

[0022] By adopting the above technical scheme, when the crack pulling device is installed, the fixing cloth is first fixed on the two sides of the construction slot, then the tensioning assembly is installed, the tensioning assembly is installed between the two fixing parts, and the two fixing parts are driven to move close to each other by the tensioning assembly, thereby giving the cracks a tendency to move close to each other. Then the construction joint is filled with mortar. The crack pulling device has a simple structure and can pull the cracks close to each other, thereby reducing the probability of reopening of the repaired cracks.

[0023] Optionally, the crack pulling device further comprises an anchor rod and a barb, the anchor rod is inclinedly arranged on the side wall of the construction slot, the fixing part is connected to the anchor rod, and the end of the anchor rod away from the fixing part is inclined toward the direction away from the surface of the cracks. A plurality of barbs are arranged on the anchor rod, and the barbs are used to enhance the anchoring property of the anchor rod.

[0024] By adopting the above technical scheme, when the fixing part is fixed, a plurality of mounting holes are first drilled on the side wall of the construction slot, the anchor rod with the barb is inserted into the mounting hole, then grouting is performed, and maintenance is performed after the grouting is completed. Then the fixing part is installed on the anchor rod. The anchor rod and the barb can enhance the stability of the fixing part, and when the fixing part is tensioned, the anchor rod gives the fixing part an inclined downward force, so that the fixing part, the tensioning assembly and the anchor rod form a stable force area distribution, thereby improving the stability of the crack pulling device and reducing the probability of crack reopening.

[0025] Optionally, the tensioning assembly comprises a first screw rod, a second screw rod and a square nut, the first screw rod is arranged on the fixing part on one side of the crack, the second screw rod is arranged on the fixing part on the other side of the crack, and the two ends of the square nut are threadedly connected with the first screw rod and the second screw rod respectively; the square nut drives the first screw rod and the second screw rod to approach each other by rotating the square nut.

[0026] By adopting the above technical scheme, after the installation of the fixing parts on both sides of the crack is completed, the first screw rod and the second screw rod are installed on the two fixing parts on the same vertical plane, and then the square nut is rotated to drive the first screw rod and the second screw rod to approach each other, so that the two fixing parts have a tendency to approach each other; the tensioning assembly is simple in structure and convenient to operate, and can make a plurality of fixing parts under the same tensioning force according to the torque of the square nut, so that the stress of the concrete on both sides of the crack is balanced, and the instability of the deepening of the crack caused by the unbalanced stress is reduced.

[0027] Optionally, the first screw rod and the second screw rod on one side of the crack are staggered.

[0028] By adopting the above technical scheme, the first screw rod and the second screw rod are staggered, so that the rotation directions of the square nuts are opposite, thereby reducing the situation that the two adjacent square nuts are simultaneously backed off due to the impact of the concrete during the concrete pouring process.

[0029] Optionally, the square nut is provided with a connecting assembly, the connecting assembly comprises a connecting rod, a fixing lug and a hanging lug, the square nut is provided with the fixing lug, the two ends of the connecting rod are provided with the hanging lug, the directions of the two hanging lugs are opposite, and the two hanging lugs are respectively hooked with one of the fixing lugs on two adjacent square nuts.

[0030] By adopting the above technical scheme, after the square nuts are tightened according to the same torque, the fixing lugs are welded on the square nuts, and then the hanging lugs on the two ends of the connecting rod are hung on the fixing lugs on two adjacent square nuts; then the connecting rod is fixed by spot welding, and after the fixing is completed, the concrete mortar is poured; the connecting assembly is simple in structure, and can connect adjacent square nuts into a whole, and two back-off square nuts are connected into a whole through the connecting rod, so that the situation of back-off can be reduced, thereby enhancing the stability of the concrete on both sides of the crack and further reducing the probability of re-cracking of the repaired crack.

[0031] Optionally, the fixing part is provided with a supporting assembly, the supporting assembly comprises a first support rod, a bearing plate and a support rod, the support rod is inserted into the crack, the bearing plate is arranged on the support rod, two first support rods are rotatably connected to the bearing plate, and one end of the first support rod away from the bearing plate is rotatably connected to the fixing part.

[0032] By adopting the technical scheme, the support rod is inserted into the crack and fixed, the bearing plate is installed on the support rod after natural solidification, then the fixing part is attached to the anchor rod, the first support rod supports the bearing plate and the fixing part, then the fixing part and the bearing plate are welded, the support assembly is arranged to form a triangular support for the fixing part, the triangular support makes the fixing part receive pulling force or supporting force from multiple parties, thereby making the stability of the fixing part and the force applied to the concrete more stable, and further reducing the probability of the crack re-cracking; meanwhile, the first support rod is rotationally connected to the fixing part and the bearing plate, which can be applied to construction slots of various shapes, and the applicability is improved.

[0033] Optionally, the support assembly further comprises a second support rod and a rotating seat, both ends of the rotating seat are rotationally connected to the first screw rod and the second screw rod respectively, the second support rod is threadedly connected to the rotating seat, and the second support rod abuts against the bearing plate.

[0034] By adopting the technical scheme, after the square nut is screwed, the rotating seat is rotated, the rotating seat drives the second support rod to move close to the bearing plate, then the second support rod is rotated to abut against the bearing plate perpendicularly, and then is welded and fixed, the second support rod applies pulling force and supporting force to the square nut; the second support rod and the rotating seat are arranged to enhance the stability of the crack joint device, balance the stress of the crack joint device, and further enhance the stability of the repaired crack.

[0035] In summary, the present application has the following beneficial technical effects:

[0036] 1. After grouting is completed, the crack joint device is installed in the construction slot, and the crack joint device is fastened, so that the crack has a tendency to be jointed, thereby making the injected mortar more dense, and at the same time, the crack can be tensioned to a certain extent, reducing the probability of re-cracking; then the construction slot is chiseled, cleaned after chiseling is completed, and then filled with concrete mortar; the above process steps can make the crack injection more dense, and at the same time, the crack is tensioned all the time, which can reduce the re-cracking of the crack and improve the construction effect;

[0037] 2. After the square nuts are tightened at the same torque, the fixing ears are welded on the square nuts, then the hanging ears on both ends of the connecting rod are hung on the fixing ears on two adjacent square nuts, then spot welding is performed, after the fixing is completed, the concrete mortar is poured; the connecting assembly is simple in structure, and adjacent square nuts are connected into a whole, and two reverse square nuts are connected into a whole through the connecting rod, which can reduce the occurrence of back-off, thereby enhancing the stability of the concrete on both sides of the crack, and further reducing the probability of re-cracking of the repaired crack;

[0038] 3. The support rod is inserted into the crack, and the support rod is fixed, after natural solidification, the bearing plate is installed on the support rod, then the fixed part is attached to the anchor rod, the first support rod supports the bearing plate and the fixed part, then the fixed part and the bearing plate are welded, the support assembly is arranged to form a triangular support for the fixed part, the triangular support makes the fixed part receive multiple pulling forces or support forces, thereby making the stability of the fixed part and the force applied to the concrete more stable, further reducing the probability of crack reopening; meanwhile, the first support rod is rotatably connected to the fixed part and the bearing plate, which can be applied to various shapes of construction grooves, and the applicability is improved;

[0039] 4. After the square nut is screwed, the rotating seat is rotated, the rotating seat drives the second support rod to approach the bearing plate, then the second support rod is rotated to be perpendicular to the bearing plate, and then it is welded and fixed, the second support rod applies pulling force and support force to the square nut; the second support rod and the rotating seat are arranged to enhance the stability of the crack joint device, so that the crack joint device is in force balance, thereby enhancing the stability of the repaired crack. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a flowchart of the gravity dam crack reinforcement construction process in the embodiment of the application;

[0041] Figure 2 It is a schematic view of the installation position of the crack joint device and the position of twice drilling and grouting in the embodiment of the application;

[0042] Figure 3 It is a structural schematic view of the crack joint device in the embodiment of the application;

[0043] Figure 4 It is a structural schematic view of the tensioning assembly in the embodiment of the application;

[0044] Figure 5 It is an exploded schematic view of the support assembly in the embodiment of the application;

[0045] Figure 6 It is a whole schematic view of the support assembly in the embodiment of the application.

[0046] Fig. 100, crack joint device; 110, fixed part; 111, clamping groove; 120, tensioning assembly; 121, first screw rod; 122, second screw rod; 123, square nut; 130, anchor rod; 140, barb; 150, connecting assembly; 151, connecting rod; 152, fixed lug; 153, hanging lug; 160, support assembly; 161, first support rod; 162, bearing plate; 163, support rod; 164, second support rod; 165, rotating seat; 166, rotating ring; 167, long nut; 168, rotating block; 169, anchoring hook; 170, fixed plate; 180, clamping block; 200, construction groove. DETAILED DESCRIPTION

[0047] The application will be further described below in conjunction with the accompanying drawings. Figures 1-6 The application will be further described below in conjunction with the accompanying drawings.

[0048] The application discloses a gravity dam crack reinforcement construction process.

[0049] Reference Figure 1 , the gravity dam crack reinforcement construction process, comprising the following steps: S1, construction preparation, grouting material, equipment arrangement preparation, according to the size of the gravity dam and the size of the crack, the spacing of the drilling hole is judged, and the drilling point arrangement is carried out;

[0050] S2, chisel seam drilling construction, first seal the crack, then drill a construction slot 200 along the gravity dam crack, the construction slot 200 is trapezoidal, then clean the construction slot 200, use the air drill for the first time drilling according to the point, control the drilling depth according to the engineering practice, control the axis of the drilling hole and the vertical plane where the crack is thirty degrees, drill towards the crack, so that the drilling hole is connected with the crack; When drilling, drilling is carried out on both sides of the crack, and the drilling positions on both sides of the crack are staggered.

[0051] S3, flushing and inspection construction, after the drilling construction is completed, first use high pressure air to blow out the sundries and gravel in the drilling hole, then use high pressure water to clean the drilling hole, then use high pressure air to clean the hole, until the sundries such as powder in the drilling hole are cleaned;

[0052] S4, grouting pipe installation and fixation, after the drilling hole and its surrounding are cleaned, install the grouting pipe in the drilling hole, then smear and fix the epoxy liquid;

[0053] S5, seal construction, then clean the crack of the gravity dam, use high pressure air and high pressure water alternately to blow clean the crack, then use epoxy mortar to seal the crack;

[0054] S6, grouting construction, after 24 hours of epoxy mortar construction, start to configure the slurry, use the grouting pump for grouting construction, in the grouting construction, the grouting pressure is adjusted according to the depth of the drilling hole and the height of the gravity dam, and should be controlled between 0.3Mpa-0.8Mpa; After the grouting strength reaches 75% of the strength, secondary drilling is carried out, the hole position of the secondary drilling is located on one side of the primary drilling close to the construction slot 200, the axis of the secondary drilling is inclined and is thirty degrees with the vertical plane where the crack is, and the secondary drilling is connected with the upper space of the crack, and secondary grouting construction is carried out;

[0055] S7, installation of the seam pulling device 100, drill a hole in the construction slot 200 to install the seam pulling device 100, and weld and fix it, which is used for balancing the stress;

[0056] S8, the construction groove 200 is blocked, the construction groove 200 is chiseled and cleaned, and then filled with concrete mortar.

[0057] Reference Figure 2 And Figure 3 The anchor rod 130 is inserted into the anchor rod 130 hole, and the anchor rod 130 is fixed by pouring mortar into the anchor rod 130 hole; in order to facilitate the anchoring of the anchor rod 130, a plurality of barbs 140 are fixedly connected to the anchor rod 130, the barbs 140 are arranged at equal intervals on the anchor rod 130 and located in the anchor rod 130 hole, and the end of the barb 140 away from the anchor rod 130 is inclined towards the construction groove 200; the fixed plate 170 is fixedly connected to one end of the anchor rod 130 located in the construction groove 200, and the fixed plate 170 is welded with the anchor rod 130; the fixed plate 170 is provided with a fixed part 110, the fixed part 110 is a fixed block, the fixed block is welded to the end of the fixed plate 170 away from the anchor rod 130, and when the fixed block is welded, it can be cut according to the actual situation, so that the two fixed blocks are located on the same horizontal plane, and the axes of the two fixed blocks are located on the same vertical plane.

[0058] Reference Figure 4 And Figure 5 The fixed block is provided with a tensioning assembly 120, the tensioning assembly 120 includes a first screw 121 and a second screw 122, the first screw 121 and the second screw 122 are provided with a plurality of threads, and the threads of the first screw 121 and the second screw 122 are opposite; the end of the first screw 121 and the second screw 122 is fixedly connected with a clamping block 180, and the clamping groove 111 is formed in the side wall of the fixed block away from the bottom of the construction groove 200, the clamping blocks 180 on the first screw 121 and the second screw 122 are respectively clamped in the clamping grooves 111 of the two fixed blocks on the same vertical plane, and the clamping grooves 111 limit the rotation of the clamping blocks 180; the plurality of first screws 121 and second screws 122 located on one side of the crack are arranged at equal intervals along the length of the crack, and the hexagonal nut 123 is threadedly connected to the end of the first screw 121 and the second screw 122 close to each other, the hexagonal nut 123 is a hexagonal nut, and when the hexagonal nut 123 is rotated, the first screw 121 and the second screw 122 are close to each other, and the rotation directions of the two adjacent hexagonal nuts 123 are opposite; when the hexagonal nut 123 is tightened, a torque wrench is used to make the torque of the hexagonal nut 123 the same, so that each group of fixed blocks receives the same tension.

[0059] Reference Figure 4Two adjacent square nuts 123 are provided with a connecting assembly 150 connecting the two, the connecting assembly 150 comprises a fixing lug 152 welded on the square nut 123, the fixing lug 152 is in a "[ ]" shape in cross section, a hanging lug 153 is hooked on the fixing lug 152, two hanging lugs 153 close to each other are fixedly connected with a connecting rod 151, the connecting rod 151 is located between the two square nuts 123 and is used for limiting the relative rotation of the two square nuts 123.

[0060] With reference to Figure 2 And Figure 6 The fixing block is provided with a supporting assembly 160, the supporting assembly 160 comprises a supporting rod 163, a plurality of supporting holes are drilled in the groove bottom of the construction groove 200, the plurality of supporting holes are equidistant along the length direction of the construction groove 200, the supporting holes are opened in the vertical direction, and the supporting rod 163 is inserted into the supporting holes; a plurality of anchor hooks 169 are fixedly connected on the supporting rod 163, the anchor hooks 169 are inclined, and the end of the anchor hooks 169 away from the supporting rod 163 is inclined towards the direction close to the construction groove 200; a bearing plate 162 is fixedly connected on the supporting rod 163, the bearing plate 162 is in a circular plate shape, the bearing plate 162 is fixedly connected with two connecting blocks, a first supporting rod 161 is rotatably connected on each of the two connecting blocks, and the end of the two first supporting rods 161 away from the bearing plate 162 is rotatably connected on the two fixing blocks; when the fixing block is installed, the bearing plate 162 is first installed on the supporting rod 163, and then the fixing block is installed, and after the first screw rod 121 and the second screw rod 122 are adjusted, the rotating end of the first supporting rod 161 is welded.

[0061] With reference to Figure 5 The end of the first screw rod 121 and the second screw rod 122 close to each other is sleeved with a rotating ring 166, the two rotating rings 166 are rotatably connected on the first screw rod 121 and the second screw rod 122 respectively, and the two rotating rings 166 are located at the two ends of the square nut 123 and have a certain rotating gap with the square nut 123; a rotating seat 165 is fixedly connected on the two rotating rings 166, the axis of the rotating seat 165 is parallel to the axis of the square nut 123, a long nut 167 is fixedly connected on the side wall of the rotating seat 165 away from the rotating ring 166, the long nut 167 is perpendicular to the rotating seat 165, a second supporting rod 164 is threadedly connected at the end of the long nut 167 away from the rotating seat 165, a rotating block 168 is fixedly connected on the second supporting rod 164 for easy rotation, and the end of the second supporting rod 164 away from the long nut 167 abuts against the bearing plate 162, and the second supporting rod 164 is welded after adjustment.

[0062] The implementation principle of the gravity dam crack reinforcement construction process embodiment of the application is as follows: first, construction equipment is prepared, and a construction groove 200 is dug along the crack, then the grouting interval and position are determined according to the engineering requirement, drilling, cleaning, checking and crack plugging are performed, then the installation of the grouting pipe is performed, and grouting work is performed; the hidden cracks are filled sufficiently by performing twice grouting work, and the cracks are fully filled; after the strength of the grouted mortar reaches the standard, the preparation work for installing the crack closing device 100 is performed, first, the support rod 163 and the anchor rod 130 are installed by drilling, then the fixing plate 170 is welded and fixed on the anchor rod 130, then the fixing block is taken out, the bearing plate 162 is abutted against the support rod 163 and welded and fixed; then the fixing block is rotated, the fixing block is cut according to the angle of the fixing plate 170, and then it is welded and fixed; then the first screw rod 121 and the second screw rod 122 are installed in sequence, the square nut 123 is rotated by using a torque wrench, the first screw rod 121 and the second screw rod 122 are close to each other, then the welding of the fixing lug 152 is performed and the lug 153 on the connecting rod 151 is hooked on the fixing lug 152 and welded and fixed; then the seat 165 is rotated, the second support rod 164 is in a free state, then the rotating block 168 is rotated, the rotating block 168 drives the second support rod 164 to abut against the bearing plate 162, and then the second support rod 164 is welded and fixed; the construction groove 200 is chiseled, then it is cleaned, and the concrete is filled.

[0063] The above are preferred embodiments of the application, and do not limit the protection scope of the application, therefore: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A method of reinforcing a crack in a gravity dam, characterized by, The method comprises the following steps: S1, construction preparation, grouting material, equipment arrangement, drilling point arrangement; S2, chisel seam drilling construction, a construction slot (200) is drilled along the gravity dam crack, then the construction slot (200) is cleaned, and drilling is performed according to the point using an air drill; S3, flushing and inspection construction, after the drilling construction is completed, high-pressure air and high-pressure water are used to clean the drilling, and the sundries in the drilling are cleaned; S4, grouting pipe installation and fixation, after the drilling and the surrounding are cleaned, the grouting pipe is installed in the drilling, and then epoxy is applied and fixed; S5, joint sealing construction, high-pressure air and high-pressure water are used to alternately blow the crack in the gravity dam clean, and then the crack is filled with epoxy mortar; S6, grouting construction, after the epoxy mortar construction is performed for 24 hours, slurry is prepared, and grouting construction is performed by using a grouting pump; S7, installation of the joint stretching device (100), the joint stretching device (100) is installed in the construction slot (200), and stress balance is achieved; S8, construction slot (200) plugging, the construction slot (200) is chiseled and cleaned, and then concrete mortar is filled; In step S6, after the grouting construction is completed, secondary drilling is performed, the position of the secondary drilling is between the primary drilling and the construction slot (200), and secondary grouting is performed; In step S7, the joint stretching device (100) comprises a fixing part (110) and a tensioning assembly (120), the fixing part (110) is provided in plurality and arranged on the side wall of the construction slot (200), the two ends of the tensioning assembly (120) are connected to the fixing parts (110) on the two sides of the crack, and the tensioning assembly (120) drives the fixing parts (110) at the two ends to move close to each other; The fixing part (110) is provided with a supporting assembly (160), the supporting assembly (160) comprises a first supporting rod (161), a bearing plate (162) and a supporting rod (163), the supporting rod (163) is inserted into the crack, the bearing plate (162) is arranged on the supporting rod (163), and two first supporting rods (161) are rotatably connected to the bearing plate (162). One end of the first supporting rod (161) away from the bearing plate (162) is rotatably connected to the fixing part (110); The tensioning assembly (120) comprises a first screw rod (121), a second screw rod (122) and a square nut (123), the first screw rod (121) is arranged on the fixing part (110) on one side of the crack, the second screw rod (122) is arranged on the fixing part (110) on the other side of the crack, and the two ends of the square nut (123) are threadedly connected with the first screw rod (121) and the second screw rod (122). When the square nut (123) is rotated, the square nut (123) drives the first screw rod (121) and the second screw rod (122) to move close to each other; The square nut (123) is provided with a connecting assembly (150), the connecting assembly (150) comprises a connecting rod (151), a fixing lug (152) and a hanging lug (153), the square nut (123) is provided with the fixing lug (152), the connecting rod (151) is provided with the hanging lug (153) at both ends, the setting direction of two hanging lugs (153) is opposite, two hanging lugs (153) are respectively hooked with one of the fixing lug (152) on two adjacent square nuts (123). The support assembly (160) further comprises a second support rod (164) and a rotating seat (165), both ends of the rotating seat (165) are rotatably connected to the first screw rod (121) and the second screw rod (122), the second support rod (164) is threadedly connected to the rotating seat (165), and the second support rod (164) abuts against the bearing plate (162).

2. The method of claim 1, wherein the method further comprises: In step S2, the positions of the drill holes are drilled on both sides of the construction groove (200), and the drill holes are obliquely arranged in the direction close to the crack, and the drill holes on both sides of the crack are staggered.

3. The method of claim 1, wherein the method further comprises: The pulling seam device (100) further comprises an anchor rod (130) and a barb (140), the anchor rod (130) is obliquely arranged on the side wall of the construction groove (200), the fixing part (110) is connected with the anchor rod (130), and one end of the anchor rod (130) away from the fixing part (110) is inclined away from the surface of the crack; a plurality of barbs (140) are arranged on the anchor rod (130), and the barbs (140) are used to enhance the anchoring property of the anchor rod (130).

4. The method of claim 1, wherein the method further comprises: The first screw rod (121) and the second screw rod (122) on one side of the crack are staggered.

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