Pre-stressed tendon tensioning structure of retard-bonded pre-stressed beam plate penetrating through post-cast strip

Abstract

A post-cast strip crossing retard-bonded prestressed beam slab prestressed tendon tensioning structure comprises a post-cast strip left prestressed beam, a post-cast strip right prestressed beam, a post-cast strip, a post-cast strip left prestressed tendon, a post-cast strip right prestressed tendon and a post-cast strip crossing prestressed tendon. The post-cast strip left side prestressed beam and the post-cast strip right side prestressed beam are prestressed beams arranged along the left side and the right side of the post-cast strip respectively; the post-cast strip left side prestressed tendon is arranged and mounted along the post-cast strip left side prestressed beam; the post-cast strip right side prestressed tendon is arranged and mounted along the post-cast strip right side prestressed beam; the post-cast strip penetrating prestressed tendons penetrate through the post-cast strip along the post-cast strip left side prestressed beam and the post-cast strip right side prestressed beam. The prestressed tendon tensioning device has the beneficial effects that the construction operation mode of implementing prestressed tendon tensioning in two stages can be achieved, the utilization rate of construction formworks can be increased, the usage amount of main body structure formworks can be reduced, meanwhile, the prestressed construction quality is guaranteed, and the construction progress is accelerated.

Description

Technical Field

[0001] The utility model belongs to the technical field of building engineering construction, and specifically relates to a slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through a post-casting strip. Background Art

[0002] During the main construction stage of the super-long span, the slow-bonding prestressed beams and post-cast strips coexist, and the prestressing tensioning operation needs to wait until the structural concrete reaches the strength requirements before it can be carried out. However, the implementation method adopted by traditional construction requires pouring the beams and slabs first, waiting for the beams and slabs to solidify and reach the strength requirements, and the main structure on both sides is completed and reaches the strength requirements, and then pouring the post-cast strips. Finally, after the post-cast strips solidify to the strength requirements, the prestressed tendons of the slow-bonding prestressed beams and slabs that pass through the post-cast strips are tensioned. The whole process is very time-consuming.

[0003] The disadvantage of the traditional construction of the above structure is that, when the prestressed tendons of the slow-bonding prestressed beams and slabs are not tensioned, the formwork structure of the entire prestressed beams and slabs cannot be dismantled, resulting in the inability to carry out the construction of the upper part of the prestressed beams and slabs. The pouring construction of the post-cast strips needs to be completed at least 42 days after the main structures on both sides are completed. The tensioning of the prestressed tendons needs to wait for at least one month after the construction of the post-cast strips. The whole process is very time-consuming. The number of supporting formworks consumed in the pouring of the super-long span main slow-bonding prestressed beams and slabs is extremely large. The length of the construction period greatly affects the consumption of the support plates, which seriously affects the construction cost and progress. The reason is that the biggest problem is that the tensioning operation of the prestressed tendons of the slow-bonding prestressed beams and slabs that cross the post-cast strips is very late, which seriously limits the construction progress. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the prestressed tendon tensioning operation of the slow-bonding prestressed beam and slab passing through the post-cast strip is carried out late, resulting in a long service life and high consumption of the construction template. Therefore, a slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through the post-cast strip is provided, which can reduce the construction period of the support template of the slow-bonding prestressed beam and slab, thereby shortening the construction period.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the prestressed tendon tensioning structure of the slow-bonding prestressed beam slab passing through the post-casting strip of the utility model comprises a prestressed beam on the left side of the post-casting strip, a prestressed beam on the right side of the post-casting strip, a post-casting strip, a prestressed tendon on the left side of the post-casting strip, a prestressed tendon on the right side of the post-casting strip and a prestressed tendon passing through the post-casting strip; the prestressed beam on the left side of the post-casting strip and the prestressed beam on the right side of the post-casting strip are prestressed beams arranged along the left side and the right side of the post-casting strip respectively; the prestressed tendon on the left side of the post-casting strip is arranged and installed along the prestressed beam on the left side of the post-casting strip, The two ends of the prestressed tendons on the left side of the post-cast strip are respectively arranged at the two ends of the prestressed beam on the left side of the post-cast strip; the prestressed tendons on the right side of the post-cast strip are arranged and installed along the prestressed beam on the right side of the post-cast strip, and the two ends of the prestressed tendons on the right side of the post-cast strip are respectively arranged at the two ends of the prestressed beam on the right side of the post-cast strip; the prestressed tendons crossing the post-cast strip are arranged and installed along the prestressed beam on the left side of the post-cast strip and the prestressed beam on the right side of the post-cast strip, and the two ends of the prestressed tendons crossing the post-cast strip are respectively arranged at the left end of the prestressed beam on the left side of the post-cast strip and the right end of the prestressed beam on the right side of the post-cast strip.

[0006] The prestressed tendons on the left side of the post-casting strip, the prestressed tendons on the right side of the post-casting strip and the prestressed tendons crossing the post-casting strip are made of ultra-high-strength, low-relaxation, slow-bonding prestressed steel strands, which are coated with a slow-bonding adhesive and wrapped with a PE sheath.

[0007] The prestressed tendons on the left side of the post-cast strip, the prestressed tendons on the right side of the post-cast strip and the prestressed tendons crossing the post-cast strip are tensioned at one end or at both ends according to their length. When the length exceeds 30m, tensioning is adopted at both ends, and when the length does not exceed 30m, tensioning is adopted at one end.

[0008] The two ends of the prestressed tendons on the left side of the post-cast strip and the prestressed tendons on the right side of the post-cast strip are respectively provided with a fixed end and a tensioning end, and the two ends of the prestressed tendons passing through the post-cast strip are provided with a tensioning end.

[0009] The fixed end is provided with an extruded anchor assembly structure, including a fixed end spiral rib, an extruded anchor seat and an extruded anchor, the fixed end spiral rib, the extruded anchor seat and the extruded anchor are sequentially installed on the prestressed rib of the fixed end, and the extruded anchor is assembled on the extruded anchor seat.

[0010] The tensioning end is equipped with a single-hole clip-type anchor, which includes a tensioning end spiral reinforcement, a pressure plate, an anchor cup and a clip. The tensioning end spiral reinforcement, the pressure plate, the anchor cup and the clip are installed on the tensioning end prestressed reinforcement in sequence. The anchor cup is pressed on the pressure plate, and the clip is assembled in the anchor cup.

[0011] The beneficial effect of the utility model is that, in response to the large-span slow-bonding prestressed beam-slab construction structure, by arranging prestressed tendons on the left side of the post-casting strip, prestressed tendons on the right side of the post-casting strip and prestressed tendons passing through the post-casting strip in the prestressed beams on both sides of the intersection of the post-casting strip, a construction operation method of tensioning the prestressed tendons is implemented in two stages, thereby achieving the effect of removing the slow-bonding prestressed beam-slab supporting formwork in advance, which not only improves the utilization rate of the construction formwork, saves the use of the main structure formwork, greatly shortens the construction period, and at the same time ensures the quality of the prestressed construction, frees up the working surface for subsequent construction, and speeds up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a schematic diagram of the plane layout structure of the utility model;

[0013] Attached Figure 2 This is a schematic diagram of the layout structure of the prestressed tendons of the beams on both sides of the post-cast belt of the utility model;

[0014] Attached Figure 3 It is a schematic diagram of the layout structure of the prestressed reinforcement passing through the post-casting belt of the utility model;

[0015] Attached Figure 4 This is a schematic diagram of the fixed end structure of the prestressed tendon of the utility model;

[0016] Attached Figure 5 This is a schematic diagram of the prestressed tendon tensioning end structure of the utility model;

[0017] In the attached drawing: prestressed beam 1 on the left side of the post-cast strip, prestressed beam 2 on the right side of the post-cast strip, post-cast strip 3, prestressed tendons 4 on the left side of the post-cast strip, prestressed tendons 5 on the right side of the post-cast strip, prestressed tendons 6 passing through the post-cast strip, fixed end A, fixed end spiral tendons A1, extrusion anchor seat A2, extrusion anchor A3, tensioning end B, tensioning end spiral tendons B1, pressure plate B2, anchor cup B3, clip B4. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below in conjunction with embodiments.

[0019] Example 1

[0020] As attached Figure 1-5As shown, the utility model of the slow-bonding prestressed beam slab prestressed tendon tensioning structure passing through the post-casting strip comprises a left prestressed beam 1 of the post-casting strip, a right prestressed beam 2 of the post-casting strip, a post-casting strip 3, a left prestressed tendon 4 of the post-casting strip, a right prestressed tendon 5 of the post-casting strip and a prestressed tendon 6 passing through the post-casting strip; the left prestressed beam 1 of the post-casting strip and the right prestressed beam 2 of the post-casting strip are prestressed beams arranged along the left and right sides of the post-casting strip 3 respectively; the left prestressed tendon 4 of the post-casting strip is arranged and installed along the left prestressed beam 1 of the post-casting strip, and the left prestressed tendon 6 of the post-casting strip is arranged and installed along the left prestressed beam 1 of the post-casting strip. The two ends of the tendon 4 are respectively arranged at the two ends of the prestressed beam 1 on the left side of the post-cast strip; the prestressed tendon 5 on the right side of the post-cast strip is arranged and installed along the prestressed beam 2 on the right side of the post-cast strip, and the two ends of the prestressed tendon 5 on the right side of the post-cast strip are respectively arranged at the two ends of the prestressed beam 2 on the right side of the post-cast strip; the prestressed tendon 6 passing through the post-cast strip is arranged and installed along the prestressed beam 1 on the left side of the post-cast strip and the prestressed beam 2 on the right side of the post-cast strip, and passes through the post-cast strip 3, and the two ends of the prestressed tendon 6 passing through the post-cast strip are respectively arranged at the left end of the prestressed beam 1 on the left side of the post-cast strip and the right end of the prestressed beam 2 on the right side of the post-cast strip.

[0021] The prestressed tendons 4 on the left side of the post-casting belt, the prestressed tendons 5 on the right side of the post-casting belt and the prestressed tendons 6 passing through the post-casting belt are made of ultra-high-strength, low-relaxation, slow-bonding prestressed steel strands, which are coated with a slow-bonding adhesive and wrapped with a PE sheath.

[0022] The prestressed tendons 4 on the left side of the post-cast strip, the prestressed tendons 5 on the right side of the post-cast strip and the prestressed tendons 6 passing through the post-cast strip are tensioned at one end or at both ends according to their length. When the length exceeds 30m, tensioning is adopted at both ends, and when the length does not exceed 30m, tensioning is adopted at one end.

[0023] The two ends of the prestressed tendons 4 on the left side of the post-cast strip and the prestressed tendons 5 on the right side of the post-cast strip are respectively provided with a fixed end A and a tensioning end B, and the two ends of the prestressed tendons 6 passing through the post-cast strip are provided with tensioning ends B.

[0024] The fixed end A is equipped with an extruded anchor combination structure, including a fixed end spiral rib A1, an extruded anchor seat A2 and an extruded anchor A3. The fixed end spiral rib A1, the extruded anchor seat A2 and the extruded anchor A3 are sequentially installed on the prestressed rib of the fixed end A, and the extruded anchor A3 is assembled on the extruded anchor seat A2.

[0025] The tensioning end B is equipped with a single-hole clip-type anchor, which includes a tensioning end spiral reinforcement B1, a pressure plate B2, an anchor cup B3 and a clip B4. The tensioning end spiral reinforcement B1, the pressure plate B2, the anchor cup B3 and the clip B4 are sequentially installed on the prestressed reinforcement of the tensioning end B. The anchor cup B3 is pressed on the pressure plate B2, and the clip B4 is assembled in the anchor cup B3.

[0026] Example 2

[0027] The utility model discloses a construction process and principle of a slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through a post-casting strip.

[0028] 1. Arrangement of prestressed tendons: Combined with the attached Figure 1 As shown, during construction, concrete formwork support is carried out according to the beam and slab design drawings. After the support is completed, prestressed tendons are arranged in the formwork in combination with the technical solution of the utility model, and in the formwork of the prestressed beam 1 on the left side of the post-casting belt to be poured and the prestressed beam 2 on the right side of the post-casting belt, the prestressed tendons are arranged in combination with the attached Figure 2-4 The structure is equipped with prestressed tendons 4 on the left side of the post-cast strip, prestressed tendons 5 on the right side of the post-cast strip, and prestressed tendons 6 passing through the post-cast strip.

[0029] 2. Casting of slow-bonding prestressed beams and slabs: According to the construction requirements, concrete pouring construction work is carried out to complete the beam and slab casting work except for the post-casting strip 3.

[0030] 3. The first tensioning of prestressed tendons: When the concrete strength of the poured slow-bonding prestressed beam and slab reaches 90%, all the prestressed tendons in the slow-bonding prestressed beam and slab except the prestressed tendons 6 passing through the post-cast strip are tensioned. According to the settings of the prestressed tendons 4 on the left side of the post-cast strip, the prestressed tendons 5 on the right side of the post-cast strip and the fixed ends A and tensioning ends B on other prestressed tendons in the design drawings, install accessories, and then cooperate with the tensioning equipment to carry out tensioning operations. After the tensioning is completed and meets the design standard conditions, all the support formworks of the slow-bonding prestressed beam and slab that are not related to the post-cast strip 3 can be dismantled.

[0031] 4. Casting of post-cast strip: According to the construction requirements, the lining components of the post-cast strip 3 are arranged, and the casting operation of the post-cast strip 3 is completed.

[0032] 5. Tensioning of prestressed tendons passing through the post-cast strip: When the concrete strength of the poured post-cast strip 3 reaches 90%, the prestressed tendons 6 passing through the post-cast strip in the slow-bonding prestressed beam and slab are tensioned in turn. After the tensioning is completed and meets the design standard conditions, all the slow-bonding prestressed beam and slab supporting formwork related to the post-cast strip 3 can be dismantled.

[0033] In the above construction process, the prestressed tendons in the slow-bonding prestressed beam and slab are tensioned in two stages: the first stage of tensioning avoids the prestressed tendons 6 that pass through the post-casting strip, and before the pouring of the post-casting strip 3, the tensioning of the prestressed tendons 4 on the left side of the post-casting strip, the prestressed tendons 5 on the right side of the post-casting strip and other prestressed tendons is completed; the second stage of tensioning is performed on the prestressed tendons 6 that pass through the post-casting strip after the pouring of the post-casting strip 3 is completed and the concrete strength standard is reached. The tensioning operation of the two stages is at least 40 days apart. The tensioning of the first stage can ensure the structural strength of the slow-bonding prestressed beam and slab, so that the formwork can be removed in advance. The number of formworks used for the casting of the long-span slow-bonding prestressed beam and slab is extremely large, and the number of formworks used at the post-casting strip 3 is limited and only accounts for a small part. The above tensioning method can save at least 40 days of the construction period of the formwork, thereby improving the use efficiency of the formwork and shortening the construction period of the overall project.

Claims

1. A prestressed tendon tensioning structure of a slow-bonding prestressed beam and slab passing through a post-cast strip, characterized in that: The invention comprises a prestressed beam (1) on the left side of a post-casting strip, a prestressed beam (2) on the right side of a post-casting strip, a post-casting strip (3), a prestressed tendon (4) on the left side of the post-casting strip, a prestressed tendon (5) on the right side of the post-casting strip, and a prestressed tendon (6) passing through the post-casting strip; the prestressed beam (1) on the left side of the post-casting strip and the prestressed beam (2) on the right side of the post-casting strip are prestressed beams arranged along the left side and right side of the post-casting strip (3), respectively; the prestressed tendon (4) on the left side of the post-casting strip is arranged and installed along the prestressed beam (1) on the left side of the post-casting strip, and the two ends of the prestressed tendon (4) on the left side of the post-casting strip are respectively arranged on the prestressed beam (1) on the left side of the post-casting strip. The two ends of the stress beam (1) are arranged on the right side of the post-casting strip; the prestressed tendons (5) on the right side of the post-casting strip are arranged and installed along the prestressed beam (2) on the right side of the post-casting strip, and the two ends of the prestressed tendons (5) on the right side of the post-casting strip are respectively arranged at the two ends of the prestressed beam (2) on the right side of the post-casting strip; the prestressed tendons (6) passing through the post-casting strip are arranged and installed along the prestressed beam (1) on the left side of the post-casting strip and the prestressed beam (2) on the right side of the post-casting strip, and pass through the post-casting strip (3), and the two ends of the prestressed tendons (6) passing through the post-casting strip are respectively arranged at the left end of the prestressed beam (1) on the left side of the post-casting strip and the right end of the prestressed beam (2) on the right side of the post-casting strip.

2. The slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through the post-cast strip as claimed in claim 1 is characterized in that: The prestressed tendons (4) on the left side of the post-casting strip, the prestressed tendons (5) on the right side of the post-casting strip and the prestressed tendons (6) passing through the post-casting strip are made of ultra-high-strength, low-relaxation, slow-bonding prestressed steel strands, which are coated with a slow-bonding adhesive and covered with a PE sheath.

3. The slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through the post-cast strip as claimed in claim 1 is characterized in that: The prestressed tendons (4) on the left side of the post-casting strip, the prestressed tendons (5) on the right side of the post-casting strip, and the prestressed tendons (6) passing through the post-casting strip are tensioned at one end or at both ends according to their length. When the length exceeds 30m, tensioning is performed at both ends, and when the length does not exceed 30m, tensioning is performed at one end.

4. The slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through the post-cast strip as claimed in claim 1, characterized in that: The two ends of the prestressed tendons (4) on the left side of the post-cast strip and the prestressed tendons (5) on the right side of the post-cast strip are respectively provided with a fixed end (A) and a tensioning end (B), and the two ends of the prestressed tendons (6) passing through the post-cast strip are provided with tensioning ends (B).

5. The slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through the post-cast strip as claimed in claim 4, characterized in that: The fixed end (A) is provided with an extruded anchor assembly structure, which includes a fixed end spiral rib (A1), an extruded anchor seat (A2) and an extruded anchor (A3); the fixed end spiral rib (A1), the extruded anchor seat (A2) and the extruded anchor (A3) are sequentially installed on the prestressed rib of the fixed end (A); and the extruded anchor (A3) is assembled on the extruded anchor seat (A2).

6. The slow-bonding prestressed beam and slab prestressed tendon tensioning structure passing through the post-cast strip as claimed in claim 4, characterized in that: The tensioning end (B) is equipped with a single-hole clip-type anchor, which includes a tensioning end spiral tendon (B1), a pressure plate (B2), an anchor cup (B3) and a clip (B4). The tensioning end spiral tendon (B1), the pressure plate (B2), the anchor cup (B3) and the clip (B4) are sequentially installed on the prestressed tendons of the tensioning end (B), the anchor cup (B3) is pressed on the pressure plate (B2), and the clip (B4) is assembled in the anchor cup (B3).

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