Construction process of prestressed concrete beams in segments

Abstract

This application relates to a construction process for segmented prestressed concrete beams, belonging to the field of prestressed beam construction technology. The process includes the following steps: binding the reinforcement of the first beam segment, installing a water-bleeding component on the beam reinforcement, and installing corrugated pipes; threading the steel strands of the first beam segment; pouring the first beam segment; tensioning the steel strands of the first beam segment; and grouting the corrugated pipes; binding the reinforcement of the first post-cast beam segment and the second beam segment; installing the water-bleeding component of the second beam segment; threading the corrugated pipes of the second beam segment; threading the steel strands of the second beam segment; connecting the steel strands of the first and second beam segments via connectors; pulling the corrugated pipes of the second beam segment through the first post-cast beam segment and splicing the ends of the corrugated pipes of the second beam segment with those of the first beam segment; pouring the second beam segment; and tensioning the ends of the steel strands of the second beam segment away from the first beam segment. This application enables the on-site construction of beams with continuous steel strands in complex environments and improves the tensile strength of small-span beams.

Description

Technical Field

[0001] This application relates to the field of prestressed construction technology, and in particular to a construction process for prestressed concrete beams constructed in segments. Background Technology

[0002] Prestressed beams are a common type of beam structure, characterized by the application of predetermined prestress during beam construction to increase the beam's strength and load-bearing capacity. Prestress is applied to the beam members through prestressed steel strands or cables, causing compressive stress in the members under load, thereby improving the overall performance of the beam.

[0003] The existing segmented prestressed beams are generally produced in component factories and then transported to the site for splicing after all the segmented beams are constructed. In some segmented construction, cast-in-place sections are reserved in adjacent bridge sections for casting to connect the adjacent bridge sections.

[0004] Regarding the aforementioned technologies, if the construction environment makes it difficult to transport large materials, it is difficult to implement this method of transporting precast beam segments to the site for installation. In addition, after the precast beam segments are produced, excess steel strands are cut off, resulting in the steel strands of this type of segmented beam being discontinuous. For beams with small spans, this construction method results in poor beam stress. Summary of the Invention

[0005] In order to enable the on-site construction of beams with continuous steel strands in complex environments and improve the tensile strength of small-span beams, this application provides a construction process for prestressed concrete beams constructed in segments.

[0006] The construction process for segmented prestressed concrete beams provided in this application adopts the following technical solution:

[0007] A construction process for prestressed concrete beams constructed in segments includes the following steps:

[0008] S1. The first beam segment reinforcement is tied, and the water-bleeding component is installed on the beam reinforcement, with corrugated pipes running through it;

[0009] S2, the steel strands of the first beam segment are threaded through, the first beam segment is poured, the steel strands of the first beam segment are tensioned, and the corrugated pipe is grouted;

[0010] S3, reinforcement binding of the first post-cast beam segment and the second beam segment, installation of the water bleeding component of the second beam segment, and installation of the corrugated pipe of the second beam segment;

[0011] S4. The steel strands of the second beam segment are threaded through, and the steel strands of the first beam segment and the steel strands of the second beam segment are connected by a connector.

[0012] S5. Pull the corrugated pipe of the second beam segment through the first post-cast beam segment and splice the end of the corrugated pipe of the second beam segment with the end of the corrugated pipe of the first beam segment.

[0013] S6. The second beam segment is poured. The steel strands of the second beam segment are tensioned at the end furthest from the first beam segment, and the corrugated pipe is grouted.

[0014] S7. The construction method of repeating steps S3 to S6 for the third beam segment to the Nth beam segment;

[0015] S8. Pouring of the first post-pouring section to the Nth post-pouring section.

[0016] By adopting the above technical solution, this method can be used to construct beams in situations with small spans and complex construction environments, solving the problem of the difficulty in transporting precast beams to the site. At the same time, segmented construction and the reservation of post-cast sections reduce the occurrence of cracks on the beam surface in the later stages. Furthermore, the corrugated pipes of the post-cast sections are grouted together with the corrugated pipes of the adjacent bridge sections as a whole, realizing the pre-grouting of the corrugated pipes of the post-cast sections.

[0017] At the same time, the corrugated pipes of the entire beam are continuous to prevent concrete from flowing into the corrugated pipes of the later-cast beam segment during the casting process.

[0018] To avoid situations where the steel strands in the post-cast sections are exposed to the outdoors for extended periods, which could lead to a decline in their performance;

[0019] The connectors overlap the steel strands, making the steel strands continuous throughout the beam and improving the tensile strength of small-span beams.

[0020] Optionally, the water-bleeding assembly includes a fixed sleeve, a water-bleeding pipe, a support sleeve, and a hanger rod. The support sleeve is connected to the hanger rod, and the hanger rod is connected to the fixed sleeve. The water-bleeding pipe is located at the crest of the corrugated pipe and passes through the support sleeve. One end of the water-bleeding pipe near the corrugated pipe has a tapered opening, and the other end of the water-bleeding pipe extends from the top of the beam.

[0021] By adopting the above technical solution, after grouting is completed, the drainage pipe can drain the excess water generated by the coagulation reaction of the grouting material from the beam, reduce water accumulation in the beam, thereby reducing the beam load and extending its service life.

[0022] The support sleeve, in conjunction with the hanger rod, facilitates the lifting and fixing of the corrugated pipe within the reinforcing cage;

[0023] After the water is drained, the drainage pipe can be pulled out and the support sleeve can be grouted to facilitate sealing of the water seepage points on the bridge deck.

[0024] Optionally, after the corrugated pipe is grouted, the drainage pipe is rotated to puncture the corrugated pipe and extend into the grout to drain the water.

[0025] Optionally, after the grout has solidified, the drainage pipe is unscrewed, the drainage pipe is pulled out from the beam segment, and grout is injected into the fixed sleeve.

[0026] Optionally, the connector includes a connecting housing and a fastening bolt. The fastening bolt is bolted to the connecting housing and has a gear. Two racks are slidably disposed within the connecting housing. The gear is located between and meshes with the two racks. A first movable plate is disposed on the side of each rack away from the gear. Two second movable plates are slidably disposed within the connecting housing. The first and second movable plates correspond one-to-one. A clamping bolt is threaded onto the second movable plate. A steel strand passes between the first and second movable plates. The clamping bolt clamps the steel strand. A groove is provided on the connecting housing for the clamping bolt to move.

[0027] By adopting the above technical solution, the steel strands extending from the beam segment are threaded into the connecting housing and pass between the first and second moving plates. Then, the clamping bolts are rotated to clamp the steel strands, and then the fastening bolts are rotated. The fastening bolts drive the gears to rotate, and the gears drive the two racks to move alternately. The racks drive the first moving plate to move. Since the steel strands are pressed tightly against the first moving plate, the first moving plate drives the steel strands to move, keeping the steel strands in a taut state. This completes the overlap of the steel strands of adjacent beam segments, allowing the connected steel strands of the beam segments to be used as a whole steel strand to bear the force, thereby improving the overall tensile strength of the beam.

[0028] Optionally, a sliding groove is provided at one end of the first movable plate away from the beam segment corresponding to the steel strand it clamps. A spring is provided in the sliding groove, and a clamping block is connected to the spring. A clamping plate is provided in the connecting housing, and a clamping groove is provided on the clamping plate. The clamping block is adapted to the clamping groove and extends into the clamping groove.

[0029] By adopting the above technical solution, when the steel strand is tightened, the first moving plate moves toward the clamping plate. The clamping block first presses against the clamping plate and extends into the sliding groove. When the clamping block is aligned with the clamping groove, the spring drives the clamping block to extend into the clamping groove. At this time, the fastening bolt can no longer be rotated, and the first moving plate is locked. This prevents the taut steel strand from retracting and causing the first moving plate to move, thereby preventing the fastening bolt from rotating out of the connecting shell and the steel strand from becoming loose. This ensures that the spliced ​​steel strand can be used as a whole steel strand to bear the force.

[0030] Optionally, in step S4, the steel strands extending out of the beam segment are cut off. The length of the steel strands extending out of the beam segment is 50-70 cm, and the reserved length of the post-cast segment is 80-100 cm.

[0031] Optionally, in steps S1 and S3, grouting pipes and grout outlet pipes are pre-embedded in the reinforcing bars. Both the grouting pipes and the grout outlet pipes are connected to the corrugated pipes, and the grouting pipes and the grout outlet pipes are flush with the top surface of the beam.

[0032] By adopting the above technical solution, grout is injected into the grouting pipe for corrugated pipe grouting. When the grout overflows from the outlet pipe, it indicates that the corrugated pipe has been grouted.

[0033] Optionally, before the concrete is poured into the beam segment, a leak-proof plug is inserted into the grouting pipe and the grout outlet pipe, and the leak-proof plug is threadedly connected to the grouting pipe and the grout outlet pipe.

[0034] By adopting the above technical solution, the anti-leakage plug can prevent concrete from flowing into the grouting pipe and grout outlet pipe and causing blockage during beam segment pouring.

[0035] When performing corrugated pipe grouting, open the leak-proof plug of the grouting pipe and then perform corrugated pipe grouting. When the corrugated pipe can no longer inject grout, slowly open the outlet pipe to allow the corrugated pipe to perform pressurized grouting, thus avoiding the situation where the corrugated pipe grouting is not complete.

[0036] Optionally, in step S5, an elastic sleeve is fitted on the splicing end of the corrugated pipe of the second beam segment, the elastic sleeve being located inside the splicing end of the corrugated pipe of the first beam segment and tightly abutting against the corrugated pipe of the first beam segment.

[0037] By adopting the above technical solution, the elastic sleeve reduces the leakage of grout at the joints of the corrugated pipes during grouting, allowing the corrugated pipes to be tightly connected.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. Segmented construction with reserved post-cast sections reduces the likelihood of cracking on the bridge deck later. Furthermore, the corrugated pipes of the post-cast sections are grouted as a whole with the corrugated pipes of the adjacent bridge sections, thus achieving pre-grouting of the corrugated pipes of the post-cast sections.

[0040] 2. Since the corrugated pipe of the entire beam is continuous, it not only prevents concrete from flowing into the corrugated pipe of the post-cast beam segment during pouring, but also prevents the steel strands of the post-cast segment from being exposed to the outdoors for a long time, which would lead to a decline in the performance of the steel strands. This allows the connector to overlap the steel strands, thus ensuring the continuity of the steel strands in the entire beam and improving the tensile strength of the small-span beam. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0042] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0043] Figure 3 yes Figure 1Enlarged schematic diagram of part B.

[0044] Figure 4 yes Figure 1 An enlarged schematic diagram of section C.

[0045] Figure 5 This is a schematic diagram illustrating the structure of the water-secreting component in an embodiment of this application.

[0046] Figure 6 This is a schematic diagram of the structure before the corrugated pipe is pulled in the second beam segment, as shown in the embodiment of this application.

[0047] Explanation of reference numerals in the attached drawings: 1. First beam segment; 2. Drainage component; 21. Fixing sleeve; 22. Drainage pipe; 23. Support sleeve; 24. Hanger rod; 3. Corrugated pipe; 31. Elastic rubber sleeve; 32. Steel strand; 4. Grouting pipe; 5. Grout outlet pipe; 6. Leakage plug; 7. First post-cast beam segment; 8. Second beam segment; 9. Connector; 91. Connecting housing; 911. Slide groove; 92. Fastening bolt; 93. Gear; 94. Rack; 95. First moving plate; 951. Sliding groove; 96. Spring; 97. Clamping block; 98. Clamping plate; 981. Clamping groove; 99. Second moving plate; 910. Pressing bolt. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0049] This application discloses a construction process for prestressed concrete beams constructed in segments.

[0050] like Figure 1 , Figure 2 and Figure 5 The construction process of prestressed concrete beams constructed in segments includes the following steps;

[0051] S1. The first beam segment 1 is tied with steel reinforcement, and the water-bleeding component 2 is installed on the beam reinforcement, with the corrugated pipe 3 passing through it;

[0052] The reinforcing bars of the first beam segment 1 are tied, and the length of the cut reinforcing bars must be greater than the length of the first beam segment 1 to facilitate lap splicing with the reinforcing bars of the first post-cast beam segment 7. During the tying of the reinforcing bars, the water-bleeding component 2 is installed according to the crest position of the corrugated pipe 3 of this beam segment.

[0053] The water-bleeding component 2 includes a fixed sleeve 21, a water-bleeding pipe 22, a support sleeve 23, and a hanger 24. There are two hangers 24. The fixed sleeve 21 is welded between the two hangers 24. Both hangers 24 are welded to the reinforcing bars. Both hangers 24 are welded to the support sleeve 23. The water-bleeding pipe 22 is threadedly connected to the fixed sleeve 21. One end of the water-bleeding pipe 22 near the support sleeve 23 has a tapered opening, and the other end of the water-bleeding pipe 22 is higher than the top elevation of the beam.

[0054] The corrugated pipe 3 is fixed to the reinforcing bar according to the design requirements. The corrugated pipe 3 passes through the support sleeve 23, which facilitates the positioning and fixing of the corrugated pipe 3.

[0055] The reinforcing steel is welded with a grouting pipe 4 and a grout outlet pipe 5. Both the grouting pipe 4 and the grout outlet pipe 5 are connected to the corrugated pipe 3. The grouting pipe 4 is connected to the trough of the corrugated pipe 3, and the grout outlet pipe 5 is connected to the crest of the corrugated pipe 3.

[0056] S2, the steel strands 32 of the first beam segment 1 are laid, the first beam segment 1 is poured, the steel strands 32 of the first beam segment 1 are tensioned, and the corrugated pipe 3 is grouted.

[0057] Before pouring concrete into the first beam segment 1, anti-leakage plugs 6 are inserted into both the grout outlet pipe 5 and the grout injection pipe 4. The anti-leakage plugs 6 are threadedly connected to the grout outlet pipe 5 to prevent concrete from flowing into the corrugated pipe 3 during the concrete pouring process, which would prevent the steel strands 32 from being installed later.

[0058] After the first beam segment 1 is poured with concrete, the steel strand 32 is threaded through the corrugated pipe 3 and tensioned. After tensioning, the leak-proof plug 6 of the grouting pipe 4 is opened to grout the corrugated pipe 3. When grouting reaches the point where no more grout can be injected into the corrugated pipe 3, the leak-proof plug 6 of the grout outlet pipe 5 is unscrewed, and grouting continues until the grout overflows from the grout outlet pipe 5. Grouting is then stopped. This method allows air inside the corrugated pipe 3 to be expelled from the gap between the end of the corrugated pipe 3 and the anchor during the grouting process, thus ensuring that the grouting in the corrugated pipe 3 is thorough and full.

[0059] After the corrugated pipe 3 is grouted, the drainage pipe 22 is turned and punctured by the drainage pipe 22. The drainage pipe 22 can discharge the excess water generated by the grouting material coagulation reaction into the beam, reducing the accumulation of water in the beam, thereby reducing the beam load and extending its service life.

[0060] After the grout has solidified, the drainage pipe 22 is unscrewed and pulled out from the beam segment. Grout is then injected into the fixing sleeve 21, which replaces the traditional situation where the drainage pipe 22 needs to be cut off and one end of the drainage pipe 22 is left inside the beam. The large diameter of the fixing sleeve 21 is more convenient for sealing and the sealing effect is better than the small diameter of the cut drainage pipe 22.

[0061] After the grout has completely solidified, the steel strands 32 are cut off. The steel strands 32 at the end of the first beam segment 1 away from the second beam segment 8 are cut off to be flush with the end face of the first beam segment 1. The steel strands 32 at the other end of the first beam segment 1 are left to extend 60 cm beyond the end face of the first beam segment 1.

[0062] S3, the reinforcement binding of the first post-cast beam segment 7 and the second beam segment 8, the installation of the water-bleeding component 2 of the second beam segment 8, and the installation of the corrugated pipe 3 of the second beam segment 8;

[0063] The reinforcing bars of the first post-cast beam segment 7 are lapped with the reinforcing bars extending from the first beam segment 1. Then, the reinforcing bars of the first post-cast beam segment 7 and the second beam segment 8 are tied simultaneously. The cutting length of the reinforcing bars of the second beam segment 8 needs to be reserved for the lap length with the reinforcing bars of the second post-cast beam segment. The length of the first post-cast beam segment 7 is 90 cm.

[0064] The installation method of the water-bleeding component 2 of the second beam segment 8 is the same as that of the water-bleeding component 2 of the first beam segment 1. The length of the corrugated pipe 3 of the second beam segment 8 should be the total length of the second beam segment 8 and the first post-cast beam segment 7.

[0065] S4. The second beam segment 8 steel strand 32 is threaded through, and the first beam segment 1 steel strand 32 and the second beam segment 8 steel strand 32 are connected by connector 9.

[0066] like Figure 3 The overlap length of the steel strand 32 is 30 cm. The connector 9 includes a connecting housing 91 and a fastening bolt 92. The fastening bolt 92 is located at the center of the connecting housing 91 and at the top of the connecting housing 91. A gear 93 is provided at one end of the fastening bolt 92 that extends into the connecting housing 91. Two racks 94 are slidably arranged inside the connecting housing 91. The gear 93 is located between the two racks 94 and meshes with the two racks 94 at the same time. A first moving plate 95 is provided on the side of the two racks 94 that is away from the gear 93.

[0067] The first movable plate 95 has a sliding groove 951 at one end away from the beam segment corresponding to the steel strand 32 it clamps. The opening direction of the sliding groove 951 is on the same side as the rack 94. A spring 96 is installed in the sliding groove 951, and the spring 96 is connected to a clamping block 97. The side of the clamping block 97 facing the gear 93 is inclined, and its inclination direction is away from the gear 93. A clamping plate 98 is installed in the connecting housing 91. There are two clamping plates 98, which are located on each side of the connecting housing 91. The clamping plates 98 correspond one-to-one with the first movable plate 95. A clamping groove 981 is opened on the clamping plate 98, and the opening of the clamping groove 981 faces the corresponding first movable plate 95. The clamping block 97 is inserted into the clamping groove 981 and is adapted to it.

[0068] Two second movable plates 99 are slidably arranged inside the connecting housing 91. The second movable plates 99 correspond one-to-one with the first movable plates 95. The first movable plates 95 are arranged opposite to the second movable plates 99. Sliding grooves 911 are provided on both sides of the connecting housing 91. The sliding grooves 911 are elongated grooves. Several clamping bolts 910 are threadedly connected to the second movable plates 99. One end of the clamping bolts 910 passes through the second movable plates 99 and the other end extends out of the connecting housing 91 through the sliding grooves 911. The steel strands 32 of the first beam segment 1 and the steel strands 32 of the second beam segment 8 each pass through a set of first movable plates 95 and second movable plates 99. The clamping bolts 910 clamp the steel strands 32.

[0069] When using connector 9, the steel strand 32 extending from the beam section is threaded into the connecting housing 91, passing between the first moving plate 95 and the second moving plate 99. Then, the clamping bolt 910 is rotated to clamp the steel strand 32. Next, the fastening bolt 92 is rotated, causing the gear 93 to rotate. The gear 93 drives the two racks 94 to move alternately, and the racks 94 drive the first moving plate 95 to move. Because the steel strand 32 is pressed tightly against the first moving plate 95, the first moving plate 95 moves the steel strand 32, keeping it taut. This tensioning of the steel strand... When the wire 32 is in place, the first moving plate 95 moves toward the clamping plate 98. The clamping block 97 first presses against the clamping plate 98 and extends into the sliding groove 951. When the clamping block 97 is aligned with the clamping groove 981, the spring 96 drives the clamping block 97 to extend into the clamping groove 981. At this time, the fastening bolt 92 can no longer be rotated, and the first moving plate 95 is locked. This prevents the taut steel strand 32 from retracting and causing the first moving plate 95 to move, thereby preventing the fastening bolt 92 from rotating out of the connecting housing 91 and the steel strand 32 and loosening. This ensures that the spliced ​​steel strand 32 can be used as a whole steel strand 32 to bear the force.

[0070] The steel strands 32 of adjacent beam segments are overlapped by connector 9, so that the steel strands 32 of the beam segments can be connected as a whole steel strand 32 to bear the force, thereby improving the overall tensile strength of the beam.

[0071] like Figure 6 S5, the corrugated pipe 3 of the second beam segment 8 is pulled through the first post-cast beam segment 7 and spliced ​​with the end of the corrugated pipe 3 of the second beam segment 8 and the first beam segment 1.

[0072] like Figure 4 The corrugated pipe 3 of the second beam segment 8 is fitted with an elastic rubber sleeve 31 at each end. The corrugated pipe 3 of the second beam segment 8 is pulled through the first post-cast beam segment 7 so that it overlaps with the part of the corrugated pipe 3 of the first beam segment 1 where the anchor is installed (i.e., the end of the corrugated pipe 3 of the first beam segment 1), and the elastic rubber sleeve 31 is tightly pressed against the inner wall of the corrugated pipe 3 of the first beam segment 1.

[0073] S6, the second beam segment 8 is poured, the steel strand 32 of the second beam segment 8 is tensioned at the end away from the first beam segment 1, and the corrugated pipe 3 is grouted;

[0074] The corrugated pipe 3 is grouted simultaneously with the corrugated pipe 3 of the first post-cast beam segment 7 and the corrugated pipe 3 of the second beam segment 8, so that the grout of the corrugated pipe 3 is combined with the grout of the corrugated pipe 3 of the first beam segment 1.

[0075] S7. The construction method of repeating steps S3 to S6 for the third beam segment to the Nth beam segment;

[0076] S8. Pouring of the first post-pouring section to the Nth post-pouring section.

[0077] The implementation principle of this application embodiment is as follows: segmented construction with reserved post-cast sections reduces the occurrence of cracks in the bridge deck later. Furthermore, the corrugated pipe 3 of the post-cast section and the corrugated pipe 3 of the adjacent bridge section are grouted as a whole, realizing the pre-grouting of the corrugated pipe 3 of the post-cast section. Moreover, since the corrugated pipe 3 of the entire beam is continuous, it not only prevents concrete from flowing into the corrugated pipe 3 of the post-cast beam section during pouring, but also avoids the steel strand 32 of the post-cast section from being exposed to the outdoors for a long time, which would lead to a decline in the performance of the steel strand 32. This allows the connector 9 to overlap the steel strand 32, thereby making the steel strand 32 of the entire beam continuous and improving the tensile strength of the small span beam.

[0078] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction process for prestressed concrete beams constructed in segments, characterized in that: The construction steps include the following: S1. The first beam segment (1) is reinforced with steel bars. A water-bleeding component (2) is installed on the beam reinforcement, and a corrugated pipe (3) is installed through it. The water-bleeding component (2) includes a fixed sleeve (21), a water-bleeding pipe (22), a support sleeve (23), and a hanger (24). The support sleeve (23) is connected to the hanger (24), and the hanger (24) is connected to the fixed sleeve (21). The water-bleeding pipe (22) is set at the crest of the corrugated pipe (3). The corrugated pipe (3) passes through the support sleeve (23). The end of the water-bleeding pipe (22) near the corrugated pipe (3) is a tapered opening, and the other end of the water-bleeding pipe (22) extends from the top of the beam. S2, the steel strands (32) of the first beam segment (1) are laid, the first beam segment (1) is poured, the steel strands (32) of the first beam segment (1) are tensioned, and the corrugated pipe (3) is grouted; S3, the first post-cast beam segment (7) and the second beam segment (8) are reinforced and tied, the water-bleeding component (2) of the second beam segment (8) is installed, and the corrugated pipe (3) of the second beam segment (8) is installed; S4. The steel strands (32) of the second beam segment (8) are threaded through, and the steel strands (32) of the first beam segment (1) and the steel strands (32) of the second beam segment (8) are connected by a connector (9). The connector (9) includes a connecting housing (91) and a fastening bolt (92). The fastening bolt (92) is bolted to the connecting housing (91). A gear (93) is provided on the fastening bolt (92). Two racks (94) are slidably arranged inside the connecting housing (91). The gear (93) is located between the two racks (94) and meshes with the two racks (94). A first moving plate (95) is provided on the side of each rack (94) away from the gear (93). Two second moving plates (99) are slidably arranged inside the connecting housing (91). The first moving plate (95) and the second moving plate (99) correspond one-to-one. The second movable plate (99) is threadedly connected to a clamping bolt (910). The steel strand (32) passes between the first movable plate (95) and the second movable plate (99). The clamping bolt (910) clamps the steel strand (32). The connecting housing (91) has a sliding groove (911) for the clamping bolt (910) to move. The first movable plate (95) has a sliding groove (951) at one end of the beam segment corresponding to the steel strand (32) it clamps. A spring (96) is provided in the sliding groove (951). The spring (96) is connected to a clamping block (97). A clamping plate (98) is provided in the connecting housing (91). A clamping groove (981) is provided on the clamping plate (98). The clamping block (97) is adapted to the clamping groove (981) and extends into the clamping groove (981). S5. The corrugated pipe (3) of the second beam segment (8) is pulled through the first post-cast beam segment (7) and the corrugated pipe (3) of the second beam segment (8) is spliced ​​with the end of the corrugated pipe (3) of the first beam segment (1); in this step, an elastic rubber sleeve (31) is provided on the splicing end of the corrugated pipe (3) of the second beam segment (8), and the elastic rubber sleeve (31) is located inside the splicing end of the corrugated pipe (3) of the first beam segment (1) and is tightly abutted against the corrugated pipe (3) of the first beam segment (1); S6, the second beam segment (8) is poured, the steel strand (32) of the second beam segment (8) is tensioned at the end away from the first beam segment (1), and the corrugated pipe (3) is grouted; S7. The construction method of repeating steps S3 to S6 for the third beam segment to the Nth beam segment; S8. Pouring of the first post-pouring section to the Nth post-pouring section.

2. The construction process of prestressed concrete beams constructed in segments according to claim 1, characterized in that: After the corrugated pipe (3) is grouted, the drainage pipe (22) is rotated and punctured by the corrugated pipe (3) to extend into the grout for drainage.

3. The construction process of prestressed concrete beams constructed in segments according to claim 2, characterized in that: After the grout has solidified, unscrew the drainage pipe (22), pull the drainage pipe (22) out of the beam segment, and inject grout into the fixed sleeve (21).

4. The construction process of prestressed concrete beams constructed in segments according to claim 1, characterized in that: In step S4, the steel strand (32) extending out of the beam segment is cut off. The length of the steel strand (32) extending out of the beam segment is 50-70 cm, and the reserved length of the post-cast segment is 80-100 cm.

5. The construction process of prestressed concrete beams constructed in segments according to claim 1, characterized in that: In steps S1 and S3, grouting pipes (4) and grout outlet pipes (5) are pre-embedded in the reinforcing bars. Both the grouting pipes (4) and the grout outlet pipes (5) are connected to the corrugated pipes (3). The grouting pipes (4) and the grout outlet pipes (5) are flush with the top surface of the beam.

6. The construction process of prestressed concrete beams constructed in segments according to claim 5, characterized in that: Before the concrete is poured into the beam segment, a leak-proof plug (6) is inserted into the grouting pipe (4) and the grout outlet pipe (5), and the leak-proof plug (6) is threadedly connected to the grouting pipe (4) and the grout outlet pipe (5).

Images