Mud jacking cap for post-tensioned beam and slab duct mud jacking
By designing a grouting cap for rear-tension beam slabs, the synchronous grouting and end sealing are achieved, which solves the problem of difficulty in guaranteeing the quality of anchor sealing in traditional construction and improves the construction efficiency and quality of beam slabs.
Patent Information
- Application Number
- CN202421756956.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-24
AI Technical Summary
During the construction of traditional post-tension beam slabs, the anchor sealing process is uneven, and the quality of the anchor sealing is difficult to ensure, which affects the grouting density of the beam slabs. After the anchor is sealed, the grouting needs to be waited until the mortar or concrete reaches a certain strength before the grouting can be pressed, affecting the construction efficiency.
A grouting cap for post-tension beam and plate channel grouting can be carried out simultaneously in grouting and end sealing. High-strength grouting materials of strength such as beam and plate concrete are used for anchor sealing, without chiseling removal in the subsequent period, eliminating the anchor sealing and solidification process.
It has achieved the guarantee of the construction quality of beam and slabs, simplified the process, eliminated the anchor sealing process, shortened the prefabricated construction cycle of beam and slabs, and improved construction efficiency.
Smart Images
Figure CN222909426U_ABST
Abstract
Description
Technical Field
[0001] The utility model specifically relates to a grouting cap for grouting of a post-tensioned beam-slab channel, and belongs to the technical field of grouting caps. Background Art
[0002] Post-tensioned beams and slabs need to be grouted after the prestressed tendons are tensioned. The traditional construction method is to seal the anchors at the tensioning ends and then perform grouting. The anchors are usually sealed with high-strength mortar or concrete of the same grade as the beam body. Since the anchor mortar or concrete is mostly mixed on-site, the errors in the weighing system and mixing time have a greater impact on the concrete strength. The anchor sealing process is uneven, and the quality of the anchor sealing is difficult to guarantee, which further affects the grouting density of the beam and slab. Moreover, after the anchor sealing, the anchor sealing mortar or concrete must reach a certain strength before grouting, which affects the overall construction efficiency of the beam and slab. If low-strength mortar is used for anchor sealing, it is necessary to chisel off the original end sealing mortar after the beam and slab are installed and before the cast-in-place concrete is poured at the beam end, which wastes manpower, material and financial resources. At the same time, it may also affect the end sealing steel strands and clips, further affecting the quality of the beam body. Utility Model Content
[0003] In order to solve the above problems, the utility model proposes a grouting cap for grouting of post-tensioned beam and slab channels, which can realize grouting and end sealing simultaneously. The end sealing adopts grouting material with high strength equal to that of beam and slab concrete, and there is no need to chisel it out later, thus ensuring the quality of beam and slab construction, and can save the sealing and anchor curing link, thereby improving the efficiency of beam and slab construction.
[0004] The utility model discloses a grouting cap for grouting holes in a post-tensioned beam and slab, comprising:
[0005] A cap pressing barrel, wherein the rear end of the cap pressing barrel is integrally formed with ear seats on both sides, and the ear seats are provided with long through holes; the front end of the cap pressing barrel is pressed together with the end of the anchor head;
[0006] A bolt anchor rod, wherein the rear end of the bolt anchor rod is screwed with a limit nut, the limit nut movably passes through the long through hole, and a pad is provided between the limit nut and the ear seat; the front end of the bolt anchor rod is fixed to the beam plate outside the anchor head;
[0007] The inner sides of the cap cylinder and the anchor head are filled with grouting slurry.
[0008] The installation process of the grouting cap is as follows: a blind hole or a reserved blind hole is opened on site on the beam plate outside the anchor head, and then the grouting cap tube and the anchor head are aligned. Then, the bolt anchor rod, the limit nut and the pad are assembled, and then the bolt anchor rod is inserted into the long through hole of the ear seat; and the bolt anchor rod is slid on the long through hole to align the bolt anchor rod with the blind hole, and then the bolt anchor rod is directly screwed into the blind hole, or the bolt anchor rod is fastened to the inside of the blind hole through the expansion sleeve; after the grouting cap is installed, the grouting operation can be carried out, and the slurry is pumped into the inside of the flow channel through which the prestressed tendons pass through by the grouting pump, and the slurry fills the flow channel, and Enter and fill into the closed space formed by the grouting cap cylinder and the anchor head, wait for the slurry to solidify, unscrew the bolt anchor rod, separate the grouting cap from the anchor head, and complete the demoulding work; use the grouting cap cylinder to seal the anchor at the tensioning end of the beam and slab, and fill the internal space of the grouting cap while grouting the beam and slab, so as to achieve the sealing of the beam and slab ends simultaneously. The sealing end adopts high-strength grouting material with the same strength as the beam and slab concrete, and there is no need to chisel it out later, thus ensuring the quality of beam and slab construction; relying on the grouting cap, grouting operation can be carried out directly after the tensioning is completed, which simplifies the process, saves the sealing link, shortens the prefabrication construction period of the beam and slab, and improves the efficiency of beam and slab construction.
[0009] Furthermore, the outer part of the pressing part between the cap cylinder and the anchor head is sleeved with a limiting sleeve, and the limiting sleeve can cover the outer part of the pressing part between the cap cylinder and the anchor head to prevent the grouting from overflowing from the pressing part.
[0010] Furthermore, the cap pressing cylinder is a bowl-shaped structure or a cylindrical structure.
[0011] Furthermore, the cap pressing cylinder comprises an outer sleeve with hollow ends, a convex pressing seat is embedded in the rear end of the outer sleeve; and the ear seat is integrally formed on the pressing seat.
[0012] Furthermore, the cap pressing cylinder comprises an outer cylinder, an inner shell is embedded in the inner side of the outer cylinder, and the inner shell is formed by two semicircular cavity columns being molded together; the front end of the inner shell is pressed tightly against the anchor head, and the rear end of the inner shell is pressed tightly against the inner surface of the outer cylinder; the outer cylinder covers the outside of the front end of the anchor head; the inner shell and the outer cylinder are matched to facilitate the assembly and demolding of the cap pressing cylinder. During assembly, the semicircular cavity columns are molded together and covered with a circle of tape, and then the inner shell is sent into the outer cylinder, and the inner shell is pressed tightly against the anchor head, and at the same time, the outer cylinder is used to limit the outer part of the anchor head; during disassembly, first detach from the outer cylinder, then cut the tape, and separate the two semicircular cavity columns respectively to complete the demolding.
[0013] Furthermore, an exhaust valve is screwed on the rear end of the cap pressing cylinder, and part of the slurry and the injected air are synchronously discharged through the exhaust valve to ensure the quality of the capping head.
[0014] Compared with the prior art, the grouting cap for grouting the channels of post-tensioned beams and slabs of the utility model can directly carry out grouting operations after tensioning is completed, thus saving beam and slab construction time. The device is easy to install and disassemble, and the construction is convenient, saving the cost of end-sealing mortar or concrete mixing and materials. High-strength grouting material with the same strength as the original beam and slab is used for anchor sealing, thus ensuring the quality of anchor sealing, ensuring the fullness of grouting, and improving the overall quality of the beam and slab. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the overall structure of the grouting cap of Example 1 of the utility model.
[0016] Figure 2 This is a schematic diagram of the cylindrical grouting cap, anchor head and beam-slab installation structure of Example 1 of the utility model.
[0017] Figure 3 This is a schematic diagram of the bowl-shaped grouting cap, anchor head and beam-slab installation structure of Example 1 of the utility model.
[0018] Figure 4 This is a schematic diagram of the grouting cap, anchor head and beam-slab installation structure of Example 2 of the utility model.
[0019] Figure 5 This is a schematic diagram of the grouting cap, anchor head and beam-slab installation structure of Example 3 of the utility model.
[0020] Figure 6 This is a schematic diagram of the grouting cap, anchor head and beam-slab installation structure of Example 4 of the utility model.
[0021] Figure numerals: 1. pressure cap cylinder, 2. ear seat, 3. long through hole, 4. anchor head, 5. bolt anchor rod, 6. limit nut, 7. pad, 8. beam and plate, 9. grouting slurry, 10. limit sleeve, 11. outer cylinder, 12. pressure seat, 13. inner liner, 14. exhaust valve, 15. outer sleeve. DETAILED DESCRIPTION
[0022] Embodiment 1:
[0023] like Figures 1 to 3 The grouting cap for grouting the hole of the post-tensioned beam and slab shown in the figure comprises:
[0024] A cap pressing barrel 1, wherein both sides of the rear end of the cap pressing barrel 1 are integrally formed with ear seats 2, and the ear seats 2 are provided with long through holes 3; the front end of the cap pressing barrel 1 is pressed together with the end of the anchor head 4;
[0025] A bolt anchor rod 5, the rear end of which is screwed to a limit nut 6, the limit nut 6 movably passes through the long through hole 3, a pad 7 is provided between the limit nut 6 and the ear seat 2; the front end of the bolt anchor rod 5 is fixed to a beam plate 8 outside the anchor head 4;
[0026] The inner sides of the cap cylinder 1 and the anchor head 4 are filled with grouting slurry 9 .
[0027] The installation process of the grouting cap is as follows: a blind hole is opened on site or a blind hole is reserved on the beam 8 outside the anchor head 4, and then the cap tube 1 and the anchor head 4 are aligned, and then the bolt anchor rod 5, the limit nut 6 and the pad 7 are assembled, and then the bolt anchor rod 5 is inserted into the long through hole 3 of the ear seat 2; and the bolt anchor rod 5 is slid on the long through hole 3 to align the bolt anchor rod 5 with the blind hole, and then the bolt anchor rod 5 is directly screwed into the blind hole, or the bolt anchor rod 5 is fastened to the inside of the blind hole through the expansion sleeve; the installation of the grouting cap is completed, and then the grouting operation can be carried out, and the slurry is pumped into the inside of the flow channel through which the prestressed tendons pass through by the grouting pump, and the slurry fills the flow channel. And enter and fill into the closed space formed by the pressing cap cylinder 1 and the anchor head 4, wait for the slurry to solidify, unscrew the bolt anchor rod 5, separate the grouting cap from the anchor head 4, and complete the demoulding work; use the pressing cap cylinder 1 to seal the anchor on the tensioning end of the beam and slab 8, and fill the internal space of the grouting cap while grouting the beam and slab 8, and simultaneously realize the sealing of the beam and slab 8. The sealing end adopts a high-strength grouting material with the same strength as the concrete of the beam and slab 8, and there is no need to chisel it out later, thereby ensuring the construction quality of the beam and slab 8; relying on the grouting cap, grouting operation can be carried out directly after the tensioning is completed, which simplifies the process, saves the sealing link, shortens the prefabrication construction period of the beam and slab 8, and improves the construction efficiency of the beam and slab 8.
[0028] The outer part of the pressing part of the cap cylinder 1 and the anchor head 4 is sleeved with a limiting sleeve 10, and the limiting sleeve 10 can cover the outer part of the pressing part of the cap cylinder 1 and the anchor head 4 to prevent the grouting from overflowing from the pressing part.
[0029] The cap pressing cylinder 1 is a bowl-shaped structure or a cylindrical structure.
[0030] Embodiment 2:
[0031] like Figure 4 The grouting cap for grouting the duct of the post-tensioned beam and slab shown in the figure comprises an outer sleeve 15 with hollow ends, a convex press seat 12 is embedded at the rear end of the outer sleeve 15; and the ear seat 2 is integrally made on the press seat 12.
[0032] Embodiment 3:
[0033] like Figure 5The grouting cap for grouting the duct of the post-tensioned beam and slab shown in the figure comprises an outer cylinder 11, an inner liner 13 is embedded in the inner side of the outer cylinder 11, and the inner liner 13 is composed of two semicircular cavity columns molded together; the front end of the inner liner 13 is pressed tightly against the anchor head 4, and the rear end of the inner liner 13 is pressed tightly against the inner surface of the outer cylinder 11; the outer cylinder 11 covers the outside of the front end of the anchor head 4; the inner liner 13 and the outer cylinder 11 are matched to facilitate the assembly and demoulding of the cap cylinder 1. During assembly, the semicircular cavity columns are molded together and covered with a circle of tape, and then the inner liner 13 is sent into the outer cylinder 11, and the inner liner 13 is pressed tightly against the anchor head 4, and at the same time, the outer part of the anchor head 4 is engaged and limited by the outer cylinder 11; during disassembly, first detach from the outer cylinder 11, then cut the tape, separate the two semicircular cavity columns respectively to complete the demoulding.
[0034] Embodiment 4:
[0035] like Figure 6 The grouting cap for grouting the post-tensioned beam and slab channel shown in the figure has an exhaust valve 14 screwed on the rear end of the grouting cap tube 1, through which part of the slurry and the injected air are synchronously discharged to ensure the quality of the head.
[0036] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.
Claims
1. A grouting cap for grouting holes in post-tensioned beam and slab, characterized in that: include: A cap pressing barrel, wherein the rear end of the cap pressing barrel is integrally formed with ear seats on both sides, and the ear seats are provided with long through holes; the front end of the cap pressing barrel is pressed together with the end of the anchor head; A bolt anchor rod, wherein the rear end of the bolt anchor rod is screwed with a limit nut, the limit nut movably passes through the long through hole, and a pad is provided between the limit nut and the ear seat; the front end of the bolt anchor rod is fixed to the beam plate outside the anchor head; The inner sides of the cap cylinder and the anchor head are filled with grouting slurry.
2. The grouting cap for grouting holes in post-tensioned beam-slab according to claim 1 is characterized by: The cap pressing cylinder is pressed together with the anchor head and the outer portion thereof is sleeved with a limiting sleeve.
3. The grouting cap for grouting holes in post-tensioned beam-slab according to claim 1 is characterized by: The cap pressing cylinder is a bowl-shaped structure or a cylindrical structure.
4. The grouting cap for grouting holes in post-tensioned beam-slab according to claim 1 is characterized by: The cap pressing cylinder comprises an outer sleeve with hollow ends, a convex pressing seat is embedded at the rear end of the outer sleeve; and the ear seat is integrally made on the pressing seat.
5. The grouting cap for grouting holes in post-tensioned beam-slab according to claim 1 is characterized by: The cap pressing cylinder comprises an outer cylinder body, an inner shell is embedded in the inner side of the outer cylinder body, and the inner shell is formed by two semicircular cavity columns being molded together; the front end of the inner shell is tightly pressed against the anchor head, and the rear end of the inner shell is tightly pressed against the inner surface of the outer cylinder body; the outer cylinder body covers the outside of the front end of the anchor head.
6. The grouting cap for grouting holes in post-tensioned beam-slab according to claim 1, characterized in that: An exhaust valve is screwed and installed on the rear end of the cap pressing cylinder.