Large-span assembly type prestressed concrete truss structure and construction method

Abstract

The invention relates to a large-span assembly type prestressed concrete truss structure and a construction method, and belongs to the technical field of assembly type concrete truss structures, the large-span assembly type prestressed concrete truss structure comprises a prefabricated column and a prefabricated beam, the prefabricated column is provided with a column prestressed hole channel, the prefabricated beam is provided with a beam prestressed hole channel, and the prefabricated beam is provided with a beam prestressed hole channel; a steel bar bundle penetrates through the column prestress hole channel and the beam prestress hole channel jointly, two fixing rings are oppositely arranged on the steel bar bundle in a sleeving mode, the prefabricated column is located between the two fixing rings, limiting strips are hinged to the faces, close to each other, of the two fixing rings, and adjusting assemblies are arranged on the fixing rings. A bending groove is formed in the inner wall of the beam prestressed duct in the circumferential direction of the beam prestressed duct, the bending groove is provided with a first inclined face and a second inclined face, and the limiting strip is used for being connected with the second inclined face in an abutting mode. The steel bar bundle tensioning device has the advantages that the steel bar bundle is not prone to moving in the tensioning process, and the construction structural strength can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of assembled concrete truss structures, and in particular to a large-span assembled prestressed concrete truss structure and a construction method. Background Art

[0002] With the development of the construction industry, the demand for large-span spatial structures is increasing. At present, assembled steel structures or concrete truss structures are usually used to realize large-span spatial structures.

[0003] In the related art, a Chinese patent document with publication number CN108060746A discloses a prefabricated prestressed concrete large-span frame system and a construction method thereof, the system includes a foundation, a prefabricated reinforced concrete column and a reinforced concrete composite beam, the composite beam includes a prefabricated beam part and a composite beam layer, the prefabricated beam part is provided with a beam prestressing channel, the prefabricated column is provided with a column prestressing channel, the column prestressing channel is aligned with the beam prestressing channel, the two channels are provided with a steel bar bundle, and the prefabricated column and the composite beam layer are anchored in the composite steel bar anchor connection. After the steel bar bundle is inserted into the beam prestressing channel and the column prestressing channel, the bonding mortar is poured into the beam-column joint to fill the joint and bond it, and after the polymer mortar reaches the required strength, the steel bar bundle is tensioned.

[0004] With respect to the above-mentioned related technologies, during the process of tensioning the steel bar bundle, the steel bar bundle is prone to move, which affects the structural strength. Summary of the invention

[0005] In order to prevent the steel bar bundle from moving easily during the tensioning process and to help ensure the strength of the construction structure, the present application provides a large-span assembled prestressed concrete truss structure and a construction method.

[0006] In the first aspect, the present application provides a large-span assembled prestressed concrete truss structure, which adopts the following technical solution: A large-span assembled prestressed concrete truss structure comprises a precast column and a precast beam, wherein the precast column is provided with a column prestressing channel, and the precast beam is provided with a beam prestressing channel, wherein the column prestressing channel and the beam prestressing channel are both penetrated with a steel bar bundle, and two fixing rings are relatively sleeved on the steel bar bundle, and the precast column is located between the two fixing rings, and the surfaces of the two fixing rings close to each other are hinged with a limit strip, and the hinge axis of the limit strip is perpendicular to the central axis of the steel bar bundle, and the fixing ring is provided with an adjustment component for adjusting the corresponding limit strip to rotate toward or away from the steel bar bundle, and a bending groove is provided on the inner wall of the beam prestressing channel along its own circumference, and the bending groove has a first inclined surface and a second inclined surface, and the second inclined surface is located on the side of the first inclined surface close to the precast column, and the diameter of the second inclined surface gradually decreases toward the direction close to the precast column, and the limit strip is used to abut against the second inclined surface.

[0007] Preferably, the adjusting assembly includes a connecting rope, a fixing strip arranged on the connecting rope, a cutting piece arranged in the column prestressed hole and an elastic piece arranged on the fixing ring, the connecting rope is arranged between the corresponding limiting strips on the two fixing rings, when the length direction of the limiting strip is parallel to the central axis of the steel bar bundle, the distance between the upper limiting strips of the two fixing rings close to one side is less than the length of the connecting rope; one end of the fixing strip is arranged on the connecting rope, and the other end is arranged on the connecting rope, the length of the connecting rope between the two ends of the fixing strip is greater than the length of the fixing strip, and when the fixing strip is in a complete state, the length direction of the limiting strip is parallel to the central axis of the steel bar bundle; the cutting piece is used to cut off the fixing strip, and the elastic piece is used to drive the limiting strip to rotate in the direction away from the steel bar bundle.

[0008] Preferably, the cutting piece includes a cutter slidably arranged in the column prestressed channel and a spring arranged in the column prestressed channel, the spring is used to maintain the position of the cutter, the cutter is provided with a first magnetic block, the fixed bar is provided with a second magnetic block, the second magnetic block is used to adsorb the first magnetic block so that the cutter cuts the fixed bar, and the adsorption force between the second magnetic block and the first magnetic block is greater than the elastic force of the spring.

[0009] Preferably, the elastic member comprises an elastic sheet for driving the limiting strip to rotate in a direction away from the reinforcing bar bundle, one end of the elastic sheet is arranged on the fixing ring, and the other end is arranged on the limiting strip.

[0010] Preferably, the fixing strip is a polystyrene strip.

[0011] Preferably, the connecting rope is a steel wire rope.

[0012] Preferably, one end of the limiting strip away from the fixing ring is aligned with the second inclined surface, and one end of the limiting strip close to the fixing ring is aligned with the first inclined surface.

[0013] Preferably, the steel bar bundle is a partially unbonded prestressed bar, the steel bar bundle comprises an unbonded section and a mid-span bonding section, the mid-span bonding section spans the prefabricated column, and the fixing ring is sleeved on the mid-span bonding section.

[0014] In a second aspect, the present application provides a construction method for a large-span assembled prestressed concrete truss structure, which adopts the following technical solution: A construction method of the large-span assembled prestressed concrete truss structure comprises the following steps: Prefabricated columns and prefabricated beams are produced in the factory, wherein a column prestressing hole is reserved in the prefabricated column, a beam prestressing hole is reserved in the prefabricated beam, and a bending groove is reserved in the beam prestressing hole; Construction foundation, prefabricated columns for the bottom floor; Install temporary supporting corbels on the precast columns on the ground floor and the precast beams to be installed; Install upper precast columns; Install the precast beam on the temporary support corbel so that the prestressing holes of the beam are aligned with the prestressing holes of the column; Install a fixing ring on the steel bar bundle, align the steel bar bundle with the column prestressing hole and the beam prestressing hole and continuously insert the steel bar bundle to a predetermined position, and adjust the limit bar to rotate in a direction away from the steel bar bundle through the adjustment component so that the end of the limit bar abuts against the corresponding second inclined surface; Pour bonding mortar into the joints between beams and columns to fill the joints and bond them tightly. After the mortar reaches the required strength, tension the steel bars.

[0015] In summary, this application includes the following beneficial technical effects: During construction, the limiting strip is adjusted by the adjusting component to rotate toward the direction close to the steel bar bundle, so that the length direction of the limiting strip is parallel to the central axis of the steel bar bundle, the steel bar bundle is aligned with the column prestressed hole and the beam prestressed hole and continuously penetrated to the predetermined position, so that the fixing ring and the limiting strip are moved to the required position, and the end of the limiting strip away from the fixing ring corresponds to the second inclined surface, and the end of the limiting strip close to the fixing ring corresponds to the first inclined surface. Then, the limiting strip is adjusted by the adjusting component to rotate toward the direction away from the steel bar bundle, so that the end of the limiting strip away from the fixing ring abuts against the second inclined surface at the corresponding position, thereby realizing the limitation of the position of the steel bar bundle, and then bonding mortar is poured into the beam-column joint to fill the joint and bond it. After the mortar reaches the required strength, the steel bar bundle is tensioned. Since the limiting strips on the fixing rings on both sides of the prefabricated column abut against the corresponding second inclined surface, the fixing ring cannot move toward the direction close to the prefabricated column, so that when the steel bar bundle is tensioned, the steel bar bundle cannot move and can only be stretched, which helps to ensure the strength of the construction structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the overall structure of an embodiment of the present application.

[0017] Figure 2 It is a partial structural cross-sectional view of an embodiment of the present application.

[0018] Figure 3 yes Figure 2 Enlarged view of part A.

[0019] Figure 4 yes Figure 2 Enlarged view of part B.

[0020] Explanation of the reference numerals in the accompanying drawings: 1. Precast column; 2. Precast beam; 3. Prestressed channel of column; 4. Prestressed channel of beam; 5. Steel bar bundle; 51. Unbonded section; 52. Mid-span bonding section; 6. Fixing ring; 7. Limiting strip; 8. Bending groove; 81. First inclined surface; 82. Second inclined surface; 9. Connecting rope; 10. Fixing strip; 11. Cutter; 12. Spring; 13. First magnetic block; 14. Second magnetic block; 15. Elastic sheet; 16. Groove. DETAILED DESCRIPTION

[0021] The following combination Figure 1-Figure 4 This application is described in further detail.

[0022] The present application embodiment discloses a large-span assembled prestressed concrete truss structure. Figure 1 The large-span assembled prestressed concrete truss structure includes a precast column 1 and a precast beam 2, wherein the precast column 1 refers to the middle column, that is, the column located in the middle position; a column prestressing hole 3 is opened on the precast column 1, and a beam prestressing hole 4 is opened on the precast beam 2, the beam prestressing hole 4 is aligned with the column prestressing hole 3, and the number of the column prestressing hole 3 and the beam prestressing hole 4 is set according to needs; the column prestressing hole 3 and the aligned beam prestressing hole 4 are both penetrated by a steel bar bundle 5, the steel bar bundle 5 is a partially unbonded prestressed bar, the steel bar bundle 5 includes an unbonded section 51 and a mid-span bonding section 52, the mid-span bonding section 52 spans the precast column 1 and extends to the beam prestressing hole 4 on both sides, the mid-span bonding section 52 is a steel bar with the outer sheath removed to expose the steel bar bundle 5, and the setting of the steel bar bundle 5 is the same as in the related art.

[0023] Reference Figure 1 and Figure 2, two fixing rings 6 are welded relatively to each other on the mid-span bonding section 52 of the steel bar bundle 5, and the fixing ring 6 is welded by two semicircular rings, so as to facilitate the fixed connection between the fixing ring 6 and the mid-span bonding section 52; the prefabricated column 1 is located between the two fixing rings 6, and the two fixing rings 6 are hinged on the sides close to each other with limit strips 7, and the hinge axis of the limit strip 7 is perpendicular to the central axis of the steel bar bundle 5. There are multiple limit strips 7 arranged along the circumference of the corresponding fixing ring 6. In the embodiment of the present application, there are three limit strips 7 arranged to leave enough space for the bonding mortar to pass through. The limit strip 7 is in the shape of an arc, and when the length direction of the limit strip 7 is parallel to the central axis of the steel bar bundle 5, the outer arc surface of the limit strip 7 is flush with the outer arc surface of the fixing ring 6.

[0024] Reference Figure 1 and Figure 2 A bending groove 8 is provided on the inner wall of the beam prestressed channel 4, and the bending groove 8 corresponds to the fixing ring 6 in the corresponding beam prestressed channel 4. The bending groove 8 is provided along the circumferential direction of the corresponding beam prestressed channel 4, and the cross-section of the bending groove 8 is V-shaped. The inner wall of the bending groove 8 has a first inclined surface 81 and a second inclined surface 82. The second inclined surface 82 is located on the side of the first inclined surface 81 close to the prefabricated column 1, and the diameter of the second inclined surface 82 gradually decreases toward the direction close to the column prestressed channel 3. The limit strip 7 is used to abut against the inner wall of the corresponding second inclined surface 82, and the fixing ring 6 is provided with an adjustment component for adjusting the limit strip 7 to rotate toward or away from the steel bar bundle 5; when the steel bar bundle 5 penetrates into the predetermined position, the end of the limit strip 7 away from the fixing ring 6 corresponds to the second inclined surface 82, and the end of the limit strip 7 close to the fixing ring 6 corresponds to the first inclined surface 81, so as to ensure that the limit strip 7 can rotate.

[0025] During construction, the limiting strip 7 is adjusted by the adjusting component to rotate toward the direction close to the reinforcing bar bundle 5, so that the length direction of the limiting strip 7 is parallel to the central axis of the reinforcing bar bundle 5. At this time, the outer arc surface of the limiting strip 7 is flush with the outer arc surface of the fixing ring 6. Then, the reinforcing bar bundle 5 is aligned with the prestressed hole of the side column, the column prestressed hole 3 of the precast column 1 and the beam prestressed hole 4 of the precast beam 2 and continuously penetrated to the predetermined position, so that the fixing ring 6 and the limiting strip 7 are moved to the required position, and the end of the limiting strip 7 away from the fixing ring 6 corresponds to the second inclined surface 82, and the end of the limiting strip 7 close to the fixing ring 6 corresponds to the first inclined surface 81. Then, by adjusting The component adjusts the limit strip 7 to rotate in the direction away from the steel bar bundle 5, so that the end of the limit strip 7 away from the fixed ring 6 abuts against the second inclined surface 82 at the corresponding position, thereby limiting the position of the steel bar bundle 5, and then pouring bonding mortar into the beam-column joint to fill the joint and bond it. After the mortar reaches the required strength, the steel bar bundle 5 is tensioned. Since the limit strips 7 on the fixed rings 6 on both sides of the prefabricated column 1 abut against the corresponding second inclined surface 82, the fixed rings 6 cannot move in the direction close to the prefabricated column 1, so that when the steel bar bundle 5 is tensioned, the steel bar bundle 5 cannot move and can only be stretched, which helps to ensure the strength of the construction structure.

[0026] Reference Figure 2 , Figure 3 ,and Figure 4 In order to facilitate the adjustment of the limit strip 7 to rotate in the direction of approaching or moving away from the reinforcement bundle 5, the adjustment assembly includes a connecting rope 9, a fixing strip 10, a cutting piece and an elastic piece. The connecting rope 9 is fixed between the corresponding limit strips 7 on the two fixing rings 6. When the length direction of the limit strip 7 is parallel to the central axis of the reinforcement bundle 5, the distance between the two corresponding limit strips 7 on the two fixing rings 6 is less than the length of the connecting rope 9; one end of the fixing strip 10 is fixed on the connecting rope 9, and the other end is also fixed on the connecting rope 9. The length of the connecting rope 9 between the two ends of the fixing strip 10 is greater than the length of the fixing strip 10. When the reinforcement bundle 5 is located at the predetermined installation position, the fixing strip 10 is located in the column prestressing channel 3. Among them, the fixing strip 10 is a polystyrene strip to ensure that the polystyrene strip can be easily cut off, and at the same time ensure that the corresponding limit strips 7 on the two fixing rings 6 are limited to the initial state. The initial state of the limit strip 7 is that the length direction of the limit strip 7 is parallel to the central axis of the reinforcement bundle 5; the connecting rope 9 is a steel wire rope with good strength. When the fixing strip 10 is in a complete state, both ends of the connecting rope 9 are in a tensioned state, and the length direction of the limiting strip 7 is parallel to the central axis of the reinforcing bar bundle 5 .

[0027] Reference Figure 2 and Figure 4The cutting piece is arranged in the column prestressed hole 3, and the cutting piece is used to cut the fixing strip 10. Specifically, in order to facilitate cutting of the fixing strip 10, grooves 16 are opened on the opposite sides of the inner wall of the column prestressed hole 3. The cutting piece includes a cutter 11 and a spring 12. The cutter 11 corresponds to the groove 16 one by one. The cutter 11 is slidably arranged in the groove 16. The cutter 11 moves along the radial direction of the column prestressed hole 3. The spring 12 is fixed between the bottom wall of the corresponding groove 16 and the cutter 11 to maintain the position of the cutter 11, so that the cutter 11 is not easy to wear against the steel bar bundle 5 during the passage of the steel bar bundle 5; first magnetic blocks 13 are fixed on both sides of the cutter 11, and a second magnetic block 14 is fixed on the side of the fixing strip 10 away from the mid-span bonding section 52. The second magnetic block 14 is used to adsorb the first magnetic block 13 to drive the cutter 11 to cut the fixing strip 10. The adsorption force between the second magnetic block 14 and the first magnetic block 13 is greater than the elastic force of the spring 12 . When the spring 12 is in a natural state, the cutter 11 is located in the groove 16 .

[0028] Reference Figure 2 and Figure 3 , the elastic member is arranged on the fixing ring 6, and the elastic member is used to drive the limiting strip 7 to rotate in the direction away from the reinforcing bar bundle 5. Specifically, the elastic member includes an elastic sheet 15, and the elastic sheet 15 corresponds to the limiting strip 7 one by one. The elastic sheet 15 is arc-shaped, and the elastic sheet 15 is convex in the direction away from the reinforcing bar bundle 5. One end of the elastic sheet 15 is fixed on the fixing ring 6, and the other end is fixed on the side of the corresponding limiting strip 7 close to the reinforcing bar bundle 5. In other embodiments, the connecting rope 9, the fixing strip 10, the cutting piece and the elastic member can be replaced by a tension spring arranged on the fixing ring 6, a first magnet arranged on the second inclined surface 82, and a second magnet arranged on the limiting strip 7. The adsorption force between the first magnet and the second magnet is greater than the tension of the tension spring. The limiting strip 7 is pulled by the tension spring to remain in a state parallel to the reinforcing bar bundle 5. When the fixing ring 6 and the limiting strip 7 move to the corresponding position, the first magnet on the second inclined surface 82 adsorbs the second magnet to drive the limiting strip 7 to rotate in the direction away from the reinforcing bar bundle 5, and the abutment between the limiting strip 7 and the corresponding second inclined surface 82 can also be achieved.

[0029] When the steel bar bundle 5 is in the initial state, the fixing strip 10 is in the complete state, and the fixing strip 10 tightens the two ends of the connecting rope 9. At this time, the length direction of the limiting strip 7 is parallel to the length direction of the steel bar bundle 5, and the outer wall arc surface of the limiting strip 7 is flush with the arc surface of the fixing ring 6, so as to facilitate the steel bar bundle 5 to pass through the beam prestressing channel 4 and the column prestressing channel 3 smoothly; when the steel bar bundle 5 is inserted to the predetermined position, the fixing strip 10 corresponds to the position of the cutter 11, the second magnetic block 14 is aligned with the first magnetic block 13, and then the steel bar bundle 5 is rotated so that the steel bar bundle 5 drives the fixing ring 6 and the limiting strip 7 along the axis of the steel bar bundle 5. The fixing strip 10 is rotated in the direction of rotation, so that the limiting strips 7 on both sides drive the fixing strip 10 to move, so that the second magnetic block 14 on the fixing strip 10 can absorb the first magnetic block 13 on the cutter 11, so that the cutter 11 moves to cut off the fixing strip 10, and then the fixing strip 10 releases the pulling on the connecting rope 9, reducing the pulling force of the connecting rope 9 on the limiting strip 7, thereby releasing the restriction on the limiting strip 7. At this time, the elastic sheet 15 on the fixing ring 6 pushes the corresponding limiting strip 7 to rotate in the direction away from the steel bar bundle 5, thereby facilitating the abutment between the limiting strip 7 and the corresponding second inclined surface 82, so as to fix the position of the steel bar bundle 5.

[0030] The implementation principle of the large-span assembled prestressed concrete truss structure of the embodiment of the present application is as follows: during construction, the two semicircular rings of the fixing ring 6 are welded to the required positions of the steel bar bundle 5. At this time, under the tensile force of the fixing strip 10, the length direction of the limiting strip 7 is parallel to the length direction of the steel bar bundle 5, and the outer arc surface of the limiting strip 7 is flush with the outer arc surface of the fixing ring 6. Then, the steel bar bundle 5 is aligned with the prestressed hole of the side column, the column prestressed hole 3 of the precast column 1 and the beam prestressed hole 4 of the precast beam 2 and continuously penetrated to the predetermined position, so that the fixing ring 6 and the limiting strip 7 are moved to the required position, that is, the end of the limiting strip 7 away from the corresponding fixing ring 6 corresponds to the second inclined surface 82, and the end of the limiting strip 7 close to the corresponding fixing ring 6 corresponds to the first inclined surface 81, the fixing strip 10 crosses the cutter 11, and the second magnetic block 14 corresponds to the position of the first magnetic block 13; then the steel bar bundle 5 is rotated, so that the steel bar bundle 5 drives the fixing ring 6 and the limiting strip 7 to rotate along the axial direction of the steel bar bundle 5, so that the two The limiting strip 7 on the side drives the fixing strip 10 to move, so that the second magnetic block 14 on the fixing strip 10 can absorb the first magnetic block 13 on the cutting knife 11, so that the cutting knife 11 moves to cut off the fixing strip 10, and then the fixing strip 10 releases the pulling on the connecting rope 9, reducing the pulling force of the connecting rope 9 on the limiting strip 7, thereby releasing the restriction on the limiting strip 7. At this time, the elastic sheet 15 on the fixing ring 6 pushes the corresponding limiting strip 7 to rotate in the direction away from the steel bar bundle 5, so as to facilitate the abutment of the limiting strip 7 with the corresponding second inclined surface 82, so as to limit the position of the steel bar bundle 5, and then pour the bonding mortar into the joint of the beam and column to fill the joint and bond it. After the mortar reaches the required strength, the steel bar bundle 5 is tensioned. Since the limiting strips 7 on the fixing rings 6 on both sides of the precast column 1 abut against the corresponding second inclined surface 82, the fixing ring 6 cannot move in the direction close to the precast column 1. When the steel bar bundle 5 is tensioned, the steel bar bundle 5 cannot move and can only be stretched, which helps to ensure the strength of the construction structure.

[0031] The present application also provides a method for constructing a large-span assembled prestressed concrete truss structure. The method for constructing a large-span assembled prestressed concrete truss structure comprises the following steps: Step 1: producing a prefabricated column 1 and a prefabricated beam 2 in a factory, wherein a column prestressing hole 3 is reserved in the prefabricated column 1, a cutting piece is arranged in the groove 16 in the column prestressing hole 3, a beam prestressing hole 4 is reserved in the prefabricated beam 2, and a bending groove 8 is reserved at a required position of the inner wall of the beam prestressing hole 4; Step 2: Construction of foundation, construction of prefabricated columns 1 at the bottom layer; Step 3: Install temporary support brackets on the bottom prefabricated columns 1 and the prefabricated beams 2 to be installed; Step 4: Install the upper prefabricated column 1; Step 5: Install the prefabricated beam 2 on the temporary support bracket so that the beam prestressing hole 4 is aligned with the column prestressing hole 3; Step 6: Weld the fixing ring 6 on the mid-span bonding section 52 of the steel bar bundle 5, tighten the two ends of the connecting rope 9 with the fixing bar 10, and the length direction of the limiting bar 7 is parallel to the length direction of the steel bar bundle 5. Align the steel bar bundle 5 with the column prestressing channel 3 and the beam prestressing channel 4 and continuously penetrate to the predetermined position, rotate the steel bar bundle 5, so that the second magnetic block 14 on each fixing bar 10 can absorb the first magnetic block 13 on the cutter 11, and then the cutter 11 cuts the fixing bar 10, and the elastic sheet 15 pushes the limiting bar 7 to rotate in the direction away from the steel bar bundle 5, so that the limiting bar 7 abuts against the second inclined surface 82 at the corresponding position; Step 7: Pour bonding mortar into the joints between beams and columns to fill the joints and bond them tightly. After the mortar reaches the required strength, tension the steel tendon 5.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A large-span assembled prestressed concrete truss structure, comprising a prefabricated column (1) and a prefabricated beam (2), wherein the prefabricated column (1) is provided with a column prestressing channel (3), and the prefabricated beam (2) is provided with a beam prestressing channel (4), characterized in that: The column prestressed hole (3) and the beam prestressed hole (4) are both penetrated by a steel bar bundle (5), two fixing rings (6) are relatively sleeved on the steel bar bundle (5), the prefabricated column (1) is located between the two fixing rings (6), and the two fixing rings (6) are hingedly connected to a limiting strip (7) on the sides close to each other, the hinge axis of the limiting strip (7) is perpendicular to the central axis of the steel bar bundle (5), and the fixing ring (6) is provided with a tool for adjusting the corresponding limiting strip (7) to move closer or farther away. An adjusting component is provided for rotating in the direction of a steel bar bundle (5); a bending groove (8) is provided on the inner wall of the beam prestressing channel (4) along its own circumference; the bending groove (8) has a first inclined surface (81) and a second inclined surface (82); the second inclined surface (82) is located on a side of the first inclined surface (81) close to the prefabricated column (1); the diameter of the second inclined surface (82) gradually decreases in a direction close to the prefabricated column (1); and the limiting strip (7) is used for abutting against the second inclined surface (82).

2. A large-span assembled prestressed concrete truss structure according to claim 1, characterized in that: The adjustment component comprises a connecting rope (9), a fixing strip (10) arranged on the connecting rope (9), a cutting piece arranged in the column prestressed hole (3) and an elastic piece arranged on the fixing ring (6); the connecting rope (9) is arranged between the corresponding limiting strips (7) on the two fixing rings (6); when the length direction of the limiting strip (7) is parallel to the central axis of the reinforcing bar bundle (5), the distance between the upper limiting strips (7) on the two fixing rings (6) is less than the length of the connecting rope (9); one end of the fixing strip (10) is arranged on the connecting rope (9), and the other end is arranged on the connecting rope (9); the length of the connecting rope (9) between the two ends of the fixing strip (10) is greater than the length of the fixing strip (10); when the fixing strip (10) is in a complete state, the length direction of the limiting strip (7) is parallel to the central axis of the reinforcing bar bundle (5); the cutting piece is used to cut the fixing strip (10), and the elastic piece is used to drive the limiting strip (7) to rotate in a direction away from the reinforcing bar bundle (5).

3. A large-span assembled prestressed concrete truss structure according to claim 2, characterized in that: The cutting piece comprises a cutter (11) slidably arranged in a column prestressed hole (3) and a spring (12) arranged in the column prestressed hole (3); the spring (12) is used to maintain the position of the cutter (11); a first magnetic block (13) is arranged on the cutter (11); a second magnetic block (14) is arranged on the fixing bar (10); the second magnetic block (14) is used to adsorb the first magnetic block (13) so that the cutter (11) cuts the fixing bar (10); and the adsorption force between the second magnetic block (14) and the first magnetic block (13) is greater than the elastic force of the spring (12).

4. The large-span assembled prestressed concrete truss structure according to claim 2, characterized in that: The elastic member comprises an elastic sheet (15) for driving the limit strip (7) to rotate in a direction away from the reinforcing bar bundle (5); one end of the elastic sheet (15) is arranged on the fixing ring (6), and the other end is arranged on the limit strip (7).

5. The large-span assembled prestressed concrete truss structure according to claim 2, characterized in that: The fixing strip (10) is a polystyrene strip.

6. The large-span assembled prestressed concrete truss structure according to claim 2, characterized in that: The connecting rope (9) is a steel wire rope.

7. The large-span assembled prestressed concrete truss structure according to claim 1, characterized in that: One end of the limiting strip (7) away from the fixing ring (6) is aligned with the second inclined surface (82), and one end of the limiting strip (7) close to the fixing ring (6) is aligned with the first inclined surface (81).

8. A large-span assembled prestressed concrete truss structure according to any one of claims 1 to 7, characterized in that: The steel bar bundle (5) is a partially non-bonded prestressed bar, and the steel bar bundle (5) comprises a non-bonded section (51) and a mid-span bonded section (52). The mid-span bonded section (52) spans the prefabricated column (1), and the fixing ring (6) is sleeved on the mid-span bonded section (52).

9. A construction method for a large-span assembled prestressed concrete truss structure as claimed in any one of claims 1 to 8, characterized in that: The steps include: Prefabricated columns (1) and prefabricated beams (2) are produced in a factory, wherein a column prestressing hole (3) is reserved in the prefabricated column (1), a beam prestressing hole (4) is reserved in the prefabricated beam (2), and a bending groove (8) is reserved in the beam prestressing hole (4); Construction foundation, prefabricated columns for the bottom layer (1); Install temporary supporting brackets on the prefabricated columns (1) on the bottom floor and the prefabricated beams (2) to be installed; Installing upper prefabricated columns (1); Installing the prefabricated beam (2) on the temporary supporting bracket so that the beam prestressing hole (4) is aligned with the column prestressing hole (3); A fixing ring (6) is installed on the steel bar bundle (5), the steel bar bundle (5) is aligned with the column prestressing hole (3) and the beam prestressing hole (4) and continuously inserted to a predetermined position, and the limiting strip (7) is adjusted by an adjustment component to rotate in a direction away from the steel bar bundle (5) so that the end of the limiting strip (7) abuts against the corresponding second inclined surface (82); Bonding mortar is poured into the joints between beams and columns to fill the joints and bond them tightly. After the mortar reaches the required strength, the steel bar tendons (5) are tensioned.

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