Sliding anchoring construction method for oblique prestress cement concrete pavement

Abstract

The invention relates to the technical field of road construction, and discloses a sliding anchoring construction method for an inclined prestressed cement concrete pavement, which is characterized by comprising the following technological processes: preparing for construction; a sliding construction platform is erected; a pavement side mold is erected; laying a sliding layer; prestressing tendons and common reinforcing steel bars are blanked; installing reinforcing steel bars; mounting a corrugated pipe; concrete construction; pre-stressed tendons are arranged in a pipe penetrating mode; tensioning the prestressed tie bars; pipeline grouting; constructing an anchoring groove closed body; road surface grooving; the micro-expansion concrete is poured into the cavity defined by the anchoring groove plate and the wall-attached steel die, an anchoring groove closed body is formed, the difficulty of prestressed tie bar closed construction is reduced, and the durability of prestressed tie bars is improved.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and more specifically to a sliding anchoring construction method for an oblique prestressed cement concrete pavement. Background Art

[0002] Under the long-term adverse natural environment and vehicle load, cement concrete pavement will expose some of its own defects, mainly manifested in the damage of concrete panels and joints, such as fracture, arching, misalignment, mud pumping, peeling and other defects. Although the currently used oblique prestressed concrete pavement can solve the problems of concrete pavement construction, it still has room for improvement in terms of difficult template installation and positioning, low efficiency of cast-in-place surface concrete pouring, poor stress performance of cast-in-place surface layer, and easy to cause defects in the later stage.

[0003] In view of the above technical status quo, our company proposes to pour micro-expansion concrete into the cavity enclosed by the anchor groove plate and the wall steel formwork to form an anchor groove closure, which helps to reduce the difficulty of the prestressed reinforcement closure construction and improve the durability of the prestressed reinforcement. Set up a sliding layer of fine sand polyethylene film (which can be replaced by composite geotextile) to reduce road vibration and reduce the occurrence of later road diseases. Use a two-time concrete pouring construction process, the first pouring to the plane of the corrugated pipe, followed by the second pouring to the top surface, to improve the installation and positioning accuracy of the corrugated pipe.

[0004] This technology has been searched by the professional science and technology search and consultation center. After searching, no literature reports identical to this technology were found, and this technology is novel. In addition, this technology has been applied for a utility model patent (patent name: a highway crack treatment device for highway engineering, patent number: ZL202122783366.9, patentee: Hunan Xianghan Zhongyu Construction Co., Ltd.) and authorized. This technology has been well applied in the "Hanshou County Yougang Town Tong Third-Class Highway X007 Line Reconstruction Project" and the "Hunan Green Expo Agriculture and Forestry Development Co., Ltd. Road Pavement Reconstruction Project", ensuring the construction quality, accelerating the construction progress, and achieving significant economic and social benefits. The engineering construction technology and experience were summarized to form a sliding anchor construction method for oblique prestressed cement concrete pavement.

[0005] Therefore, the present invention proposes a sliding anchoring construction method for an oblique prestressed cement concrete pavement. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a sliding anchor construction method for an inclined prestressed cement concrete pavement to solve the problems existing in the above-mentioned background technology.

[0007] The present invention provides the following technical solutions: a sliding anchor construction method for an oblique prestressed cement concrete pavement, and a process flow of the sliding anchor construction method for an oblique prestressed cement concrete pavement: Construction preparation; Set up sliding construction platform; Pavement side formwork support; Laying of sliding layer; Cutting of prestressed steel bars and ordinary steel bars; Steel bar installation; Bellows installation; Concrete construction; Prestressed tendons are laid through pipes; Prestressed tendons tensioning; Pipeline grouting; Construction of anchor groove closure; Road surface grooves.

[0008] Preferably, the pavement side form is placed on the pavement base layer, and vertical positioning bolts and horizontal positioning bolts are set on the side of the pavement side form close to the prefabricated pier top channel plate, and the spatial position of the pavement side form is controlled by the vertical positioning bolts and horizontal positioning bolts. The angle of the prestressed tendons along the driving direction of the pavement is 30°, the spacing between the reinforcement bars is 0.5m, the reinforcement bars are 12.7 unbonded prestressed steel strands, and the structural reinforcement on both sides adopts C35 concrete crown beams.

[0009] Preferably, the template uses a steel template, and the prestressed tendons should reserve a tensioning length of 40 to 60 cm. A rectangular groove is opened at a certain distance in the template. The template ground is close to the top surface of the base layer. The local low-lying areas (gaps) are paved with cement mortar in advance. In order to facilitate the layout of the prestressed tendons and leave space for prestressing, a triangular box welded with steel plates is arranged on the edge of the road surface line. The triangular box should be perpendicular to the prestressed tendons on the side through which the tendons are passed, and a circular hole with a diameter of 30 mm is opened to ensure that the corrugated pipe passes through exactly. The hole opening position The location is determined according to the position of the prestressed tendons in the direction of the plate thickness to play the role of fixing the corrugated pipe. The specific size of the triangular box needs to be determined according to the anchor size to ensure that the anchor is cast in the concrete after sealing and meets the requirements of the protective layer thickness. The tensioning end of the oblique prestressed concrete pavement adopts a single-hole clip-type anchor with an anchor diameter of 50mm, a pad size of 80mm*80mm, and a thickness of 13mm. Anti-split steel bars and spiral reinforcement steel bars are set in the local pressure-bearing area of ​​the prestressed tendon end (anchor section, tensioning end).

[0010] Preferably, the sliding layer is arranged on the top surface of the base layer, and the base layer should be flat and free of pits. Before laying the sliding layer, the surface of the base layer should be cleaned first. Fine sand and polyethylene film should be laid on the base layer in advance as the sliding layer. The fine sand should be sieved with a 5mm square hole sieve to remove oversized particles. The fine sand should be dry and laid as the installation progresses. When laying, it should be scraped flat with a 6m long aluminum alloy rod, and then a 0.3mm polyethylene film should be laid on it.

[0011] Preferably, the prestressed tendon has a diameter of 12.7 mm and a cross-sectional area of ​​98.7 mm. 2 For prestressed steel strands, select the middle part of the plate thickness as the centroid of the two layers of prestressed tendons. The pavement concrete strength grade is C35. Check the specifications, dimensions and quantity of prestressed tendons and structural steel bars. Mechanical cutting should be used for cutting steel strands and structural steel bars. Electric welding or gas cutting is strictly prohibited. Prestressed tendons should be kept as straight as possible, and those with large bends should be removed.

[0012] Preferably, the structural steel bars are arranged along the edge of the pavement according to the design drawings, small steel bars are welded at the bottom of the steel cage to keep the steel cage stably placed, adjacent steel cage joints are connected by electric welding, and the positions without oblique prestressed tendons at the ends of the road panels are reinforced with steel mesh with a spacing of 30cm*30cm, and the range must cover the blank triangular area.

[0013] Preferably, both ends of the corrugated pipe pass through the interior of the longitudinal structural steel cage of the tensioning end, and pass through the pre-processed triangular box, and finally extend from the hole of the tensioning end template to the outside of the template, and are arranged in a bidirectional cross-arrangement according to the design drawings, and stand steel bars are placed at the intersection as needed. After the corrugated pipe is arranged, it should be straightened to ensure the angle between the prestressed tendons and the longitudinal direction of the pavement. The corrugated pipe can be straightened with a rope, and the intersection positions of the straightened corrugated pipe (including both the lower support frame and the non-support frame) are tied and fastened with wire at intervals. In order to prevent the corrugated pipe from shifting during concrete pouring, the steel strand bundle is completed before pouring concrete.

[0014] Preferably, after the deformation joint filling body forms strength, the prestressed tendons are passed through the prestressed tendon passing tube, and the anchor groove plate is used as the tensioning support body to apply prestressed force to the prestressed tendons. The tensioning of the prestressed tendons is divided into two tensioning times. The first tensioning is carried out 12 hours after the concrete road panel is poured, and the strength of the concrete reaches 30% of the design strength. The tensioning control stress is 0.3σcon; the second tensioning is carried out 7d after the concrete road panel is poured, and the strength of the concrete reaches 75% of the design strength. Super tensioning is adopted, the stress is controlled to be 1.05σcon, the duration is 2min, the load is unloaded to σcon, and then anchored.

[0015] Preferably, before grouting, the bellows ports of adjacent plates need to be tightly connected and wrapped tightly to avoid leakage. Concrete mortar is poured from one end of the post-tensioning pipe to the other end. The flow time of concrete mortar in two adjacent grouting ports is used to check the fluidity of concrete mortar. When the concrete mortar flows to the middle grouting port, the grouting port should be blocked. If a large amount of concrete mortar is poured into the pipe but concrete mortar cannot be seen at the middle grouting port or the end of the pipe, the grouting should be restarted from the middle grouting port.

[0016] Preferably, in order to meet the requirements of road skid resistance and drainage, the grooving directions are transverse, that is, the direction perpendicular to the center line of the road surface; and longitudinal, that is, the direction parallel to the center line of the road surface; the grooving direction can also be divided into double oblique, that is, the direction parallel to the oblique prestressed tendons. In terms of anti-skid and drainage, double lateral grooving is better than transverse and longitudinal grooving. The specific grooving method is carried out according to relevant specifications and design unit requirements after the assembly is completed. The detailed dimensions of the grooves are carried out according to the drawings and relevant specifications. The groove spacing should be 12~24mm, the cross-section of the groove is trapezoidal, the trapezoidal wound width is 5mm, the lower mouth width is 3mm, and the depth is 5mm. When grooving, the lines must be laid out in advance and the groups must be grouped according to the width of the grooving machine, with a spacing of 10~20cm between each group.

[0017] Technical effects and advantages of the present invention: Pouring micro-expansive concrete into the cavity enclosed by the anchor groove plate and the wall-attached steel formwork to form an anchor groove closure body helps to reduce the difficulty of prestressed reinforcement closure construction and improve the durability of prestressed reinforcement.

[0018] A fine sand polyethylene film sliding layer is set up to reduce road vibration and reduce the occurrence of later road diseases.

[0019] The tensioning of prestressed tendons is divided into two stages. The first stage controls the stress at 0.3σcon (σcon is the design value of concrete compressive strength). The second stage is super-tensioning, with the stress controlled at 1.05σcon for 2 minutes. The tendons are unloaded to σcon and then anchored to avoid stress loss and improve construction quality.

[0020] The two-time concrete pouring construction process is adopted, with the first pouring to the plane of the prestressed pipe, followed by the second pouring to the top surface, to improve the installation and positioning accuracy of the prestressed pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the construction structure of the anchor groove closure body of the present invention.

[0022] Figure 2 It is a process flow chart of the present invention.

[0023] Figure 3 This is a plan view of the road slab reinforcement arrangement of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the inclined prestressed cement concrete pavement sliding anchor construction method involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Reference Figure 1-3 The present invention provides a sliding anchor construction method for an oblique prestressed cement concrete pavement. The process flow of the sliding anchor construction method for an oblique prestressed cement concrete pavement is as follows: Construction preparation The construction of prestressed reinforced cement concrete road slab can only be carried out after the construction quality of the roadbed, cushion layer, base layer and lower sealing layer meets the requirements of the "Technical Specifications for Highway Pavement Base Construction" and the "Technical Specifications for Highway Roadbed Construction"; All materials must be inspected and accepted upon arrival in accordance with regulations, and can only be used on site if they meet the requirements; Before the construction of prestressed reinforced cement concrete road slabs, the various properties of the materials must be checked, and construction can only be carried out after the performance indicators meet the requirements and the quality and quantity are met.

[0026] Sliding construction platform erection The prefabricated pier foundation is inserted into a hole in the foundation soil, and the pier top adjustment plate is placed on the upper part of the prefabricated pier foundation, and its top surface elevation is controlled by the pier top alignment body; the pier top slot plate is placed on the pier top adjustment plate, and the platform slide rail is placed in the slide rail connecting groove on the upper surface of the pier top slot plate, so that the sliding roller on the lower surface of the sliding support plate is embedded in the sliding track of the platform slide rail, and a platform sliding beam is arranged on the upper surface of the sliding support plate.

[0027] Pavement side formwork support The pavement side formwork is placed on the pavement base, and vertical and horizontal alignment bolts are set on the side of the pavement side formwork close to the prefabricated pier top channel plate, and the spatial position of the pavement side formwork is controlled by the vertical and horizontal alignment bolts. The angle of the prestressed tendons along the driving direction of the pavement is 30°, the spacing of the tendons is 0.5m, and the tendons are 12.7 unbonded prestressed steel strands. The structural reinforcement on both sides adopts C35 concrete crown beams; The template uses steel templates, and the prestressed tendons should reserve a tensioning length of 40 to 60 cm. A rectangular groove is opened at a certain distance in the template. The template ground is close to the top surface of the base, and the local low-lying areas (gaps) are paved with cement mortar in advance. In order to facilitate the layout of prestressed tendons and leave space for prestressed tensioning, a triangular box welded with steel plates is arranged on the edge of the pavement line. The triangular box should be perpendicular to the prestressed tendons on the side through which the tendons are passed, and a circular hole with a diameter of 30 mm is opened to ensure that the corrugated pipe just passes through. The opening position is determined according to the position of the prestressed tendons in the direction of the plate thickness to play a role in fixing the corrugated pipe. The specific size of the triangular box needs to be determined according to the anchor size to ensure that the anchor is cast in the concrete after sealing the anchor and meets the requirements of the protective layer thickness. The tensioning end of the oblique prestressed concrete pavement adopts a single-hole clip-type anchor with a diameter of 50 mm, a pad size of 80 mm*80 mm, and a thickness of 13 mm. Anti-split steel bars and spiral reinforcement steel bars are set in the local pressure-bearing area at the ends of the prestressed tendons (anchor section, tensioning end).

[0028] Laying the sliding layer The sliding layer is set on the top surface of the base layer, and the base layer should be flat and free of pits. Before laying the sliding layer, clean the surface of the base layer. Fine sand and polyethylene film should be laid on the base layer in advance as the sliding layer. Fine sand should be screened with a 5mm square hole sieve to remove oversized particles. Fine sand should be dry and laid as the installation progresses. When laying, use a 6m long aluminum alloy rod to scrape it flat, and then lay a 0.3mm polyethylene film on it.

[0029] Cutting of prestressed steel bars and ordinary steel bars The diameter of the prestressed tendons is 12.7 mm and the cross-sectional area is 98.7 mm. 2 For prestressed steel strands, the middle part of the plate thickness is selected as the centroid position of the two layers of prestressed tendons. The pavement concrete strength grade is C35. Check the specifications, dimensions and quantity of prestressed tendons and structural steel bars. Mechanical cutting should be used for cutting steel strands and structural steel bars. Electric welding or gas cutting is strictly prohibited. Prestressed tendons should be kept as straight as possible, and those with large curvatures should be removed.

[0030] Steel bar installation The structural reinforcement is arranged along the edge of the road surface according to the design drawings. Small steel bars are welded at the bottom of the steel cage to keep the steel cage stable. The joints of adjacent steel cages are connected by electric welding. The position without oblique prestressed tendons at the end of the road panel is reinforced with a steel mesh with a spacing of 30cm*30cm, and the range should cover the blank triangular area.

[0031] Bellows Installation The two ends of the corrugated pipe pass through the longitudinal steel cage of the tensioning end, and pass through the pre-processed triangular box, and finally extend from the hole of the tensioning end template to the outside of the template. According to the design drawings, it is arranged in a two-way cross-arrangement, and the frame steel bars are placed at the intersection as needed. After the corrugated pipe is arranged, it should be straightened to ensure the angle between the prestressed tendons and the longitudinal direction of the road surface. The corrugated pipe can be straightened with a rope, and the intersection position of the straightened corrugated pipe (including both the lower support frame and the non-support frame) is tied and fastened with wire at intervals. In order to prevent the displacement of the corrugated pipe during the concrete pouring process, the steel strands are bundled before pouring concrete.

[0032] Concrete construction The concrete is poured in two times, the first time to the plane of the corrugated pipe, followed by the second time to the top surface. The mixture needs to have sufficient fluidity to ensure that the concrete fills the gaps between the steel bars and the formwork with little vibration. During the pumping and pouring process, pay attention to avoid direct impact on the corrugated pipe when the concrete falls. If the corrugated pipe is found to sink or shift, correct it in time to ensure that the position of the steel mesh meets the design requirements when the pouring is completed.

[0033] Prestressed tendon pipe laying Anchor groove plates are arranged on the inner side of the pavement side formwork, and prestressed tendons are arranged and passed between the anchor groove plates in a direction oblique to the pavement side formwork.

[0034] Prestressed tendon tensioning After the deformation joint filling body forms strength, the prestressed tendons are inserted into the prestressed tendon insertion tube, and the anchor slot plate is used as the tensioning support body to apply prestressed tension to the prestressed tendons. The tensioning of the prestressed tendons is divided into two tensioning. The first tensioning is 12 hours after the concrete road slab is poured, and the strength of the concrete reaches 30% of the design strength. The tensioning control stress is 0.3σcon; the second tensioning is 7 days after the concrete road slab is poured, and the concrete strength reaches 75% of the design strength. Super tensioning is used, the control stress is 1.05σcon, the duration is 2 minutes, unloading to σcon, and then anchoring.

[0035] Pipeline grouting Before grouting, the bellows ports of the adjacent plates need to be tightly connected and wrapped tightly to avoid leakage. Concrete mortar is poured from one end of the post-tensioned pipe to the other end. The flow time of concrete mortar in two adjacent grouting ports is used to check the fluidity of concrete mortar. When concrete mortar flows to the middle grouting port, the grouting port should be blocked. If a large amount of concrete mortar is poured into the pipe but concrete mortar cannot be seen at the middle grouting port or the end of the pipe, grouting should be restarted from the middle grouting port.

[0036] Anchor groove closure construction Simultaneously, wall-attached steel formworks are set up on both sides of the cast-in-place surface layer and the precast panel, and the anchor groove closure body is poured into the cavity formed by the wall-attached steel formworks and the anchor groove plate, and maintenance construction is carried out in a timely manner.

[0037] Road grooves In order to meet the requirements of road skid resistance and drainage, the groove direction is horizontal, that is, the direction perpendicular to the center line of the road surface; there is a longitudinal direction, that is, the direction parallel to the center line of the road surface; the groove direction can also be divided into double oblique, that is, the direction parallel to the oblique prestressed tendons. In terms of anti-skid and drainage, double lateral grooves are better than horizontal and longitudinal. The specific groove method is to be constructed according to the relevant specifications and design unit requirements after the assembly is completed. The detailed dimensions of the groove are carried out according to the drawings and relevant specifications. The groove spacing should be 12~24mm, the cross-section of the groove is trapezoidal, the trapezoidal wound width is 5mm, the lower mouth width is 3mm, and the depth is 5mm. When grooving, the lines should be laid out in advance, and the groups should be grouped according to the width of the groover, with a spacing of 10~20cm between each group.

[0038] Working principle of the present invention: This method is aimed at the construction of prestressed concrete pavement by inclined tensioning method. A fine sand polyethylene film sliding layer is set at the bottom of the prestressed concrete pavement by inclined tensioning method to reduce the vibration of the pavement during operation. The tensioning of the prestressed tendons is divided into two tensioning. The first tensioning is carried out 12 hours after the concrete road slab is poured, and the strength of the concrete reaches 30% of the design strength; the second tensioning is carried out 7 days after the concrete road slab is poured, and the strength of the concrete reaches 75% of the design strength, which can reduce the occurrence of pavement diseases in the later period. At the same time, the concrete pouring construction process is adopted twice. The first pouring is to the plane of the prestressed pipe, and the installation position of the prestressed pipe is adjusted in time to improve the installation positioning accuracy of the prestressed pipe. Then the second concrete pouring is carried out to the top surface. By pouring micro-expansion concrete into the cavity enclosed by the anchor groove plate and the wall-attached steel mold, an anchor groove closed body is formed, which helps to reduce the difficulty of the closed construction of the prestressed tendon and improve the durability of the prestressed tendon.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or modifications within the technical scope disclosed by the present invention; according to the technical plan and its improved conception of the present invention, all of which should be included under the protection of the present invention.

Claims

1. The sliding anchor construction method for oblique prestressed cement concrete pavement is characterized by: Process flow of sliding anchor construction method for inclined prestressed cement concrete pavement: Construction preparation; Set up sliding construction platform; Pavement side formwork support; Laying of sliding layer; Cutting of prestressed steel bars and ordinary steel bars; Steel bar installation; Bellows installation; Concrete construction; Prestressed tendons are laid through pipes; Prestressed tendons tensioning; Pipeline grouting; Construction of anchor groove closure; Road surface grooves.

2. The sliding anchor construction method for inclined prestressed cement concrete pavement according to claim 1 is characterized in that: The pavement side formwork is placed on the pavement base layer. Vertical and horizontal positioning bolts are set on the side of the pavement side formwork close to the prefabricated pier top channel plate, and the spatial position of the pavement side formwork is controlled by the vertical and horizontal positioning bolts. The angle of the prestressed tendons along the driving direction of the pavement is 30°, the spacing between the reinforcements is 0.5m, the reinforcements are 12.7 unbonded prestressed steel strands, and the structural reinforcement on both sides adopts C35 concrete cap beams.

3. The sliding anchor construction method for inclined prestressed cement concrete pavement according to claim 1 is characterized by: The template uses steel template, and the prestressed tendons should reserve a tensioning length of 40 to 60 cm. A rectangular groove is opened at a certain distance in the template. The template ground is close to the top surface of the base layer. The local low-lying areas (gaps) are paved with cement mortar in advance. In order to facilitate the layout of prestressed tendons and leave space for prestressed tensioning, a triangular box welded with steel plates is arranged on the edge of the road surface. The triangular box should be perpendicular to the prestressed tendons on the side through which the tendons are passed, and a circular hole with a diameter of 30 mm is opened to ensure that the corrugated pipe passes through exactly. The hole position is based on According to the position of the prestressed tendons in the direction of the plate thickness, in order to play the role of fixing the corrugated pipe, the specific size of the triangular box needs to be determined according to the anchor size to ensure that the anchor is cast in the concrete after sealing and meets the requirements of the protective layer thickness. The tensioning end of the oblique prestressed concrete pavement adopts a single-hole clip-type anchor with an anchor diameter of 50mm, a pad size of 80mm*80mm, and a thickness of 13mm. Anti-split steel bars and spiral reinforcement steel bars are set in the local pressure-bearing area of ​​the prestressed tendon end (anchor section, tensioning end).

4. The sliding anchor construction method for inclined prestressed cement concrete pavement according to claim 1 is characterized by: The sliding layer is set on the top surface of the base layer. The base layer should be flat and free of pits. Before laying the sliding layer, the surface of the base layer should be cleaned first. Fine sand and polyethylene film should be laid on the base layer in advance as a sliding layer. The fine sand should be sieved with a 5mm square hole sieve to remove oversized particles. The fine sand should be dry and laid as the installation progresses. When laying, use a 6m long aluminum alloy rod to scrape it flat, and then lay a 0.3mm polyethylene film on it.

5. The sliding anchor construction method for inclined prestressed cement concrete pavement according to claim 1 is characterized in that: The diameter of the prestressed tendons is 12.7 mm and the cross-sectional area is 98.7 mm. 2 For prestressed steel strands, select the middle part of the plate thickness as the centroid of the two layers of prestressed tendons. The pavement concrete strength grade is C35. Check the specifications, dimensions and quantity of prestressed tendons and structural steel bars. Mechanical cutting should be used for cutting steel strands and structural steel bars. Electric welding or gas cutting is strictly prohibited. Prestressed tendons should be kept as straight as possible, and those with large bends should be removed.

6. The sliding anchor construction method for inclined prestressed cement concrete pavement according to claim 1 is characterized by: The structural reinforcement is arranged along the edge of the pavement according to the design drawings. Small steel bars are welded at the bottom of the steel cage to keep the steel cage in a stable position. Adjacent steel cage joints are connected by electric welding. The position at the end of the road panel where there is no oblique prestressed tendons is reinforced with a steel mesh with a spacing of 30cm*30cm, and the range must cover the blank triangular area.

7. The sliding anchor construction method for an oblique prestressed cement concrete pavement according to claim 1 is characterized in that: Both ends of the corrugated pipe pass through the interior of the longitudinal structural steel cage at the tensioning end, and pass through the pre-processed triangular box, and finally extend from the hole of the tensioning end template to the outside of the template. It is arranged in a two-way cross-arrangement according to the design drawings, and stand steel bars are placed at the intersection as needed. After the corrugated pipe is arranged, it should be straightened to ensure the angle between the prestressed tendons and the longitudinal direction of the pavement. The corrugated pipe can be straightened with a rope, and the intersection positions of the straightened corrugated pipe (including both the lower support frame and the non-support frame) should be tied and fastened with wire at intervals. In order to prevent the corrugated pipe from shifting during the concrete pouring process, the steel strand bundle is completed before pouring concrete.

8. The sliding anchor construction method for inclined prestressed cement concrete pavement according to claim 1 is characterized by: After the deformation joint filling body forms strength, the prestressed tendons are passed through the prestressed tendon passing tube, and the anchor groove plate is used as the tensioning support body to apply prestressed force to the prestressed tendons. The tensioning of the prestressed tendons is divided into two tensioning. The first tensioning is carried out 12 hours after the concrete road panel is poured, and the strength of the concrete reaches 30% of the design strength. The tensioning control stress is 0.3σcon; the second tensioning is 7d after the concrete road panel is poured, and the concrete strength reaches 75% of the design strength. Super tensioning is used, the control stress is 1.05σcon, the duration is 2min, the load is unloaded to σcon, and then anchored.

9. The sliding anchor construction method for an oblique prestressed cement concrete pavement according to claim 1 is characterized by: Before grouting, the bellows ports of the adjacent plates need to be tightly connected and wrapped tightly to avoid leakage. Concrete mortar is poured from one end of the post-tensioning pipe to the other end. The flow time of concrete mortar in two adjacent grouting ports is used to check the fluidity of concrete mortar. When the concrete mortar flows to the middle grouting port, the grouting port should be blocked. If a large amount of concrete mortar is poured into the pipe but concrete mortar cannot be seen at the middle grouting port or the end of the pipe, the grouting should be restarted from the middle grouting port.

10. The sliding anchor construction method for an oblique prestressed cement concrete pavement according to claim 1 is characterized in that: In order to meet the requirements of pavement anti-skid and drainage, the grooving directions are transverse, that is, the direction perpendicular to the center line of the pavement; longitudinal, that is, the direction parallel to the center line of the pavement; the grooving direction can also be divided into double oblique, that is, the direction parallel to the oblique prestressed tendons. In terms of anti-skid and drainage, double lateral grooving is better than transverse and longitudinal. The specific grooving method is carried out according to the relevant specifications and requirements of the design unit after the assembly is completed. The detailed dimensions of the grooves are carried out according to the drawings and relevant specifications. The groove spacing should be 12~24mm, the cross-section of the groove is trapezoidal, the trapezoidal wound width is 5mm, the lower mouth width is 3mm, and the depth is 5mm. When grooving, the lines must be laid out in advance and the groups must be grouped according to the width of the grooving machine, with a spacing of 10~20cm between each group.

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