Prestressed hollow floor with tension structure
By setting up a connection structure of steel strands and anchor steel plates in the prestressed hollow core slab, combined with high-strength grouting material, the problems of insufficient load-bearing capacity and easy fall were solved, and the safety and environmental protection were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI JIANYAN STRUCTURAL ENG CO LTD
- Filing Date
- 2025-07-01
- Publication Date
- 2026-07-21
AI Technical Summary
Existing prestressed hollow core slabs have poor load-bearing capacity and are prone to collapse during earthquakes. Demolition and reuse are time-consuming and labor-intensive, which violates environmental protection policies.
Steel strands are installed inside the slab, and the support beams are connected by anchoring steel plates and chemical anchors. Combined with high-strength grouting material, the tension adjustment and reinforcement of the steel strands are achieved.
It improves the load-bearing capacity and integrity of the floor slab, reduces the risk of falls, facilitates reuse, and complies with environmental protection policies.
Smart Images
Figure CN224532002U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of prestressed hollow core slab technology, and in particular to a prestressed hollow core slab with a tensioning structure. Background Technology
[0002] Prestressed hollow core slabs are a common type of precast reinforced concrete slab. They contain one or more longitudinal ducts to save materials and reduce weight. They are usually made of prestressed concrete, and their size is determined by the size of the building bay and the capacity of the hoisting machinery. The ducts in the slab are beneficial for sound insulation and heat insulation.
[0003] However, existing prestressed hollow core slabs have poor load-bearing capacity in actual use. They are prone to collapse during earthquakes, causing casualties. When they need to be demolished or reused, they must be crushed and rebuilt, which is not only time-consuming and labor-intensive, but also contradicts the current national energy conservation, low-carbon, and zero-carbon policies, and is detrimental to environmental protection. Therefore, we propose a prestressed hollow core slab with a tension structure. Summary of the Invention
[0004] The purpose of this utility model is to provide a prestressed hollow floor slab with a tension structure, which improves the load-bearing capacity of the original floor slab and effectively enhances the integrity of the original floor slab with the surrounding structure, making it less prone to falling and ensuring high safety.
[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a prestressed hollow floor slab with a tension structure, comprising a slab body, a first support beam, and a second support beam. The slab body is installed on top of the first and second support beams. Five equidistant holes are formed inside the slab body. Wire-passing holes are formed on both sides of the bottom of the two outermost holes of the slab body. Steel strands are threaded through the two outermost holes of the slab body. The two ends of the two steel strands extend to the outer side of the bottom of the slab body through the four wire-passing holes. Two wire-passing holes are fixedly installed on opposite sides of the first and second support beams. An anchoring steel plate is used. Two first square steel bars are fixedly installed on the side of the first support beam near the second support beam by the two anchoring steel plates. Two second square steel bars are fixedly installed on the side of the second support beam near the first support beam by the two anchoring steel plates. An internal threaded sleeve is fixedly installed at the middle position of the top of the inner side of the second square steel bar. An external threaded sleeve is installed on the internal thread of the internal threaded sleeve. The bottom end of the external threaded sleeve extends to the outer side of the bottom of the second square steel bar. A single-hole through-type anchor is provided at the bottom end of the external threaded sleeve. One end of the steel strand is fixedly connected to the external threaded sleeve through the single-hole through-type anchor.
[0006] A further feature of this invention is that a single-hole through-hole anchor is provided at the middle position of the bottom of the first square steel, and the other end of the steel strand is fixedly connected to the first square steel through the single-hole through-hole anchor.
[0007] A further feature of this invention is that inverted conical chemical anchors are provided on both sides of the interior of the anchoring steel plate, and the four anchoring steel plates are respectively fixedly connected to the first support beam and the second support beam through the inverted conical chemical anchors on both sides.
[0008] A further feature of this invention is that the first square steel and the second square steel, along with their corresponding anchoring steel plates, are fixed by welding.
[0009] A further feature of this invention is that the two outermost holes of the plate are filled with high-strength grout.
[0010] The beneficial effects of this utility model are as follows: This utility model inserts steel strands inside the holes of the plate. One end of the steel strand is fixedly connected to a first square steel bar via a single-hole through-hole anchor. The first square steel bar is welded to an anchoring steel plate, which is fixedly connected to a first support beam via two inverted conical chemical anchors. The other end of the steel strand is fixedly connected to an external threaded sleeve via a single-hole through-hole anchor. The external threaded sleeve is threaded inside an internal threaded sleeve, which is fixedly connected to a second square steel bar. The second square steel bar is also fixedly connected to a second support beam via an anchoring steel plate and inverted conical chemical anchors. By rotating the external threaded sleeve, it can be raised and lowered within the internal threaded sleeve, thereby achieving tension adjustment of the steel strand. This reinforcement method effectively improves the load-bearing capacity of the original floor slab and enhances the overall integrity of the original floor slab with the surrounding structure, making it less prone to collapse and ensuring high safety. It also allows for convenient reuse of the original floor slab, eliminating the need for crushing and rebuilding, thus saving manpower and resources. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0013] Figure 2 This is a cross-sectional view of the present invention.
[0014] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle; Figure 4 This is a side view of the present invention.
[0015] In the figure, 1. Plate; 2. First support beam; 3. Second support beam; 4. First square steel; 5. Second square steel; 6. External threaded sleeve; 7. Steel strand; 8. Anchoring steel plate; 9. Inverted conical chemical anchor; 10. Plate hole; 11. Internal threaded sleeve; 12. Single hole through-type anchor; 13. Threading hole. Detailed Implementation
[0016] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0017] Please see Figure 1-4 This utility model provides a technical solution: Example 1
[0018] A prestressed hollow core slab with a tension structure includes a slab 1, a first support beam 2, and a second support beam 3. The slab 1 is installed on top of the first support beam 2 and the second support beam 3. Five equally spaced holes 10 are formed inside the slab 1. Two wire-passing holes 13 are formed on both sides of the bottom of the two outermost holes 10 of the slab 1. Steel strands 7 are threaded through the two outermost holes 10 of the slab 1. The two ends of the two steel strands 7 extend to the outer side of the bottom of the slab 1 through the four wire-passing holes 13. Two anchor steel plates 8 are fixedly installed on opposite sides of the first support beam 2 and the second support beam 3. Two first square steel bars 4 are fixedly installed on the side of the first support beam 2 closest to the second support beam 3 via the two anchor steel plates 8. Two second square steel bars 5 are fixedly installed on the side of the second support beam 3 closest to the first support beam 2 via the two anchor steel plates 8. An internal threaded sleeve 11 is fixedly installed at the middle position of the top inner side of the second square steel 5. An external threaded sleeve 6 is installed on the internal thread of the internal threaded sleeve 11. The bottom end of the external threaded sleeve 6 extends to the outer side of the bottom of the second square steel 5, and a single-hole through-type anchor 12 is provided at the bottom end of the external threaded sleeve 6. One end of the steel strand 7 is fixedly connected to the external threaded sleeve 6 through the single-hole through-type anchor 12. By rotating the external threaded sleeve, the external threaded sleeve can be raised and lowered inside the internal threaded sleeve, thereby realizing the tension adjustment of the steel strand. A single-hole through-type anchor 12 is provided at the middle position of the bottom of the first square steel 4. The other end of the steel strand 7 is fixedly connected to the first square steel 4 through the single-hole through-type anchor 12. Through this reinforcement method, the load-bearing capacity of the plate 1 is effectively improved, and the integrity of the plate 1 with the first support beam 2 and the second support beam 3 is also effectively improved, making it less likely to fall. Example 2
[0019] The difference between this embodiment and Embodiment 1 is that: Inverted conical chemical anchors 9 are provided on both sides of the anchoring steel plate 8. The four anchoring steel plates 8 are respectively fixedly connected to the first support beam 2 and the second support beam 3 through the inverted conical chemical anchors 9 on both sides. The inverted conical chemical anchor 9 has an inverted conical screw and consists of a screw, a flat washer, and a nut. It is used with injection-type anchoring adhesive. During installation, the injection-type anchoring adhesive is injected into the drilled hole, and then the inverted conical chemical anchor is rotated clockwise into the hole. After the anchoring adhesive cures, an adhesive is formed between the hole wall and the anchor. The layers of adhesive and the inverted conical anchor bolts work together to generate an expansion force similar to that of a mechanical anchor bolt. The mechanical locking key between the inverted cone and the concrete ensures the connection strength, thereby achieving reliable anchoring and effectively improving the stability of the structure after installation. The first square steel 4 and the second square steel 5 are fixed to their corresponding anchor steel plates 8 by welding, making the square steel and the anchor steel plates 8 an integral structure with strong stability. The two outermost plate holes 10 of the plate body 1 are filled with high-strength grout, which can effectively improve the stability after tensioning.
[0020] Working principle: Before use, check the safety of each structure of this device. First, make wire holes 13 on both sides of the bottom of the two outermost plate holes 10 of the plate body 1. Insert the steel strand 7 through the wire hole 13 at one end of the plate hole 10 with the wire hole 13 made. Pull out one end of the steel strand 7 through the wire hole 13 at the other end of the plate hole 10. Then fix one end of the steel strand 7 to the first square steel 4 through a single-hole through-type anchor 12. The first square steel 4 is welded to the anchoring steel plate 8. The anchoring steel plate 8 is fixedly connected to the first support beam 2 through two inverted conical chemical anchors 9. The other end of the steel strand 7 is fixed through the single-hole through-type anchor 12. 2. The external threaded sleeve 6 is fixedly connected to the internal threaded sleeve 11. The internal threaded sleeve 11 is fixedly connected to the second square steel 4. The second square steel 4 is also fixedly connected to the second support beam 3 through the anchoring steel plate 8 and the inverted conical chemical anchor 9. Then, the external threaded sleeve 6 is rotated to make it rise and fall inside the internal threaded sleeve 11. During the rising and falling of the external threaded sleeve 6, one end of the steel strand 7 is moved to realize the tension adjustment of the steel strand 9. After the adjustment is completed, high-strength grout is injected into the plate hole 10 through which the steel strand 7 is inserted. After the grout inside the plate hole 10 is filled and solidified, the reinforcement is completed.
[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Standard parts used in this application are all commercially available and can be customized according to the description and drawings. Specific connections of the various parts employ conventional methods mature in the prior art. Machinery, parts, and equipment adopt conventional models in the prior art, and circuit connections adopt conventional connection methods in the prior art, which will not be specifically described here.
[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A prestressed hollow core slab with a tension structure, comprising a slab (1), a first support beam (2), and a second support beam (3), characterized in that: The plate (1) is installed on the top of the first support beam (2) and the second support beam (3). Five plate holes (10) are equally spaced inside the plate (1). Wire holes (13) are opened on both sides of the bottom of the two outermost plate holes (10) of the plate (1). Steel strands (7) are threaded through the two outermost plate holes (10) of the plate (1). The two ends of the two steel strands (7) extend to the outer side of the bottom of the plate (1) through the four wire holes (13). Two anchoring steel plates (8) are fixedly installed on the opposite side of the first support beam (2) and the second support beam (3). The side of the first support beam (2) near the second support beam (3) is connected by... Two anchoring steel plates (8) are fixedly installed with two first square steels (4). Two second square steels (5) are fixedly installed on the side of the second support beam (3) near the first support beam (2) through the two anchoring steel plates (8). An internal thread sleeve (11) is fixedly installed at the middle position of the top of the inner side of the second square steel (5). An external thread sleeve (6) is installed on the internal thread of the internal thread sleeve (11). The bottom end of the external thread sleeve (6) extends to the outside of the bottom of the second square steel (5). A single-hole through-type anchor (12) is provided at the bottom end of the external thread sleeve (6). One end of the steel strand (7) is fixedly connected to the external thread sleeve (6) through the single-hole through-type anchor (12).
2. A prestressed hollow floor slab with a tension structure according to claim 1, characterized in that: The single-hole through-type anchor (12) is provided at the middle position of the bottom of the first square steel (4), and the other end of the steel strand (7) is fixedly connected to the first square steel (4) through the single-hole through-type anchor (12).
3. A prestressed hollow core slab with a tension structure according to claim 1, characterized in that: Both sides of the anchoring steel plate (8) are provided with inverted conical chemical anchors (9), and the four anchoring steel plates (8) are fixedly connected to the first support beam (2) and the second support beam (3) respectively through the inverted conical chemical anchors (9) on both sides.
4. A prestressed hollow floor slab with a tension structure according to claim 1, characterized in that: The first square steel (4) and the second square steel (5) are fixed to their corresponding anchoring steel plates (8) by welding.
5. A prestressed hollow core slab with a tension structure according to claim 1, characterized in that: The two outermost holes (10) of the plate (1) are filled with high-strength grout.