Pre-embedded rigid bread pipe protective sleeve

By designing a pre-embedded rigid protective sleeve for bread tubes, and utilizing a combination of annular support protection rings and threaded support rods, the problem of incompatibility of existing bread tube protective sleeves is solved. This achieves stable clamping and high rigidity protection for different types of bread tubes, reducing costs and management difficulties.

CN224944499UActive Publication Date: 2026-11-06CHINA CONSTR WATER ENVIRONMENTAL PROTECTION CO LTD
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Patent Information

Application Number
CN202522138609.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-10
Publication Date
2026-11-06
Estimated Expiration
2035-10-10

AI Technical Summary

Technical Problem

In the existing technology, the protective sleeve for bread tubes cannot be adjusted and adapted to different models of bread tubes, resulting in high material procurement costs, difficulty in inventory management, and model mismatch that can easily lead to project delays. Furthermore, the protective sleeve has poor adaptation, clamping and fixing performance, insufficient anti-extrusion rigidity, and insufficient high-strength rigidity protection capability.

Method used

A pre-embedded rigid protective sleeve for bread tubes was designed, including an annular support and protection ring, a C-shaped adjustment port, a snap-fit ​​mounting block, a threaded support rod, and pre-embedded mounting parts. Through the combination of threaded connection and pre-embedded mounting parts, stable clamping and rigid protection of bread tubes of different models can be achieved.

Benefits of technology

It achieves stable compatibility and clamping for different types of bread tubes, improves the convenience of installation and rigid protection, prevents bread tubes from being damaged by external deformation, and reduces material procurement and management costs.

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Abstract

This utility model relates to the field of building construction equipment technology and discloses a pre-embedded rigid protective sleeve for bread tubes. It includes a bread tube body with an annular support and protection ring on the outer side. Both sides of the annular support and protection ring have corresponding C-shaped adjustment ports. This utility model, by providing C-shaped adjustment ports on both sides of the annular support and protection ring, facilitates the installation and adjustment of the locking mounting block. The locking mounting block is threaded with a threaded support rod, which can push an arc-shaped extrusion plate to press and fix the bread tube body, facilitating stable multi-point clamping operations. The annular support and protection ring provides rigid outer ring protection. An anti-expansion crack prefabricated plate is sleeved on the pre-embedded mounting component, providing auxiliary anti-expansion crack protection. This makes the device convenient for multi-point clamping operations, easy to adapt and stably clamp different types of bread tubes, and the protected tube body is not easily deformed or damaged by external forces, demonstrating excellent rigid protection capabilities.
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Description

Technical Field

[0001] This utility model relates to the field of building construction equipment technology, and in particular to a pre-embedded rigid bread tube protective sleeve. Background Technology

[0002] "Bread pipe" is a common industry term for plastic or metal conduits with a flat or rectangular cross-section, capable of accommodating one or more electrical wires, cables, or water pipes. Named for its bread-like shape, it's frequently used in installation environments where space is crucial and interference between pipes is avoided, such as wall cavities or floor slab layers. Rigid bread pipe protective sleeves are pipeline protection components used in building water and electricity installations and municipal pipeline laying. During pre-embedding, the protective sleeve supports the bread pipe. After the concrete solidifies, the protective sleeve becomes integrated with the building structure. Subsequent installation simply involves inserting the bread pipe through the pre-drilled channel in the protective sleeve.

[0003] In existing technologies, protective sleeves for bread tubes are typically designed for a specific type of bread tube. Since bread tubes come in various sizes, protective sleeves must be designed specifically for each size, making it impossible to adjust and fit them according to different outer diameters. Purchasing protective sleeves of corresponding specifications separately for different bread tube models not only increases material procurement costs and inventory management difficulties but also easily leads to project delays due to model mismatches on-site. Furthermore, the protective sleeves' compatibility, clamping, and fixing performance are relatively poor, their applicability is limited, and their pre-embedded protection capability for bread tubes is relatively inadequate, with insufficient resistance to compression and rigid stress, and insufficient high-strength rigid protection capability. Therefore, we propose a pre-embeddable rigid protective sleeve for bread tubes to solve these problems. Utility Model Content

[0004] In response to the problems raised, this utility model provides a pre-embedded rigid bread tube protective sleeve to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pre-embedded rigid bread tube protective sleeve includes a bread tube body, and an annular support and protection ring is provided on the outer side of the bread tube body; Both sides of the annular support and protection ring are provided with C-shaped adjustment ports. The two C-shaped adjustment ports are evenly engaged and slidably fitted with engagement and installation blocks. A threaded support rod is threadedly installed in the middle of the engagement and installation blocks. Arc-shaped extrusion plates and pre-embedded installation parts are respectively installed at both ends of the threaded support rod. The pre-embedded installation parts are located on the outside of the annular support and protection ring. The arc-shaped extrusion plates are extruded and positioned on the outside of the bread tube body. An anti-expansion crack prefabricated plate is sleeved on the pre-embedded installation parts.

[0006] Preferably, the annular support and protection ring is installed in a ring shape on the outside of the bread tube body, and a flexible joint protection sleeve is sleeved on the outside of the bread tube body. Multiple arc-shaped extrusion pieces are abutted and positioned on the outside of the flexible joint protection sleeve, and the annular support and protection ring corresponds to the position of the flexible joint protection sleeve.

[0007] Preferably, the annular support and protection ring includes two arc-shaped semicircular rings, which are assembled in a ring shape on the outside of the bread tube body. Both ends of the two arc-shaped semicircular rings are provided with bolts for fixing. The two ends of the two arc-shaped semicircular rings are bolted together by the bolts for fixing. Two adjacent C-shaped adjustment ports are opened on the two arc-shaped semicircular rings.

[0008] Preferably, the plurality of the engaging mounting blocks are H-shaped and slidingly engaged within the C-shaped adjustment port. An adjustment threaded port is provided in the middle of the engaging mounting block, and the threaded support rod is threaded through the adjustment threaded port. The two ends of the threaded support rod are located inside and outside the annular support protection ring, respectively.

[0009] Preferably, the side of the arc-shaped extrusion piece away from the threaded support rod is abutted and positioned on the bread tube body, the arc-shaped extrusion piece is concave arc-shaped, and the side of the threaded support rod away from the arc-shaped extrusion piece is fixedly connected to the pre-embedded mounting part.

[0010] Preferably, the embedded mounting component is fixed to the threaded support rod in a cross shape, and the anti-expansion precast plate is vertically snapped into the bottom of the embedded mounting component.

[0011] Preferably, a cross-shaped anti-slip sleeve is embedded in the center of the anti-expansion precast slab, the cross-shaped anti-slip sleeve is sleeved and fixed on the pre-embedded mounting component, and the anti-expansion precast slab is limited and sleeved on the pre-embedded mounting component by the cross-shaped anti-slip sleeve.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. This pre-embedded rigid bread tube protective sleeve has C-shaped adjustment ports on both sides of the annular support protective ring, which facilitates the installation and sliding of the locking and mounting block within the C-shaped adjustment ports. The locking and mounting block is threadedly connected to a threaded support rod. Rotating the threaded support rod allows it to extend and retract within the locking and mounting block, facilitating the pushing of the arc-shaped extrusion plate on the threaded support rod to press and fix it to the outside of the bread tube body. In the opposite direction, the locking and mounting block is positioned, facilitating the pressing and positioning of the locking and mounting block on the C-shaped adjustment port. The installation and positioning effect is good, which facilitates stable multi-point clamping operations and makes the device easy to use for multi-point clamping operations and easy to adapt and stably clamp different types of bread tubes.

[0013] 2. The pre-embedded rigid bread tube protective sleeve, by setting the pre-embedded installation part outside the annular support protection ring, makes it easy to adjust by rotating the threaded support rod by hand. The annular support protection ring can provide rigid protection for the outer ring. The pre-embedded installation part is fitted with an anti-expansion crack prefabricated plate, which plays an auxiliary role in anti-expansion crack protection. The rigid protection capability of the bread tube body is good, making the device's protective tube body less susceptible to deformation and damage from external forces. The rigid protection capability is excellent. Attached Figure Description

[0014] Figure 1 A frontal perspective three-dimensional schematic diagram of a pre-embedded rigid bread tube protective sleeve proposed in this utility model; Figure 2 A top view schematic diagram of a pre-embedded rigid bread tube protective sleeve proposed in this utility model; Figure 3 This is a top-view perspective view of the bread tube body of this utility model after the main body has been removed; Figure 4 This is a side perspective three-dimensional schematic diagram of the connection structure between the embedded installation component and the anti-expansion crack precast slab of this utility model; Figure 5 This is a side perspective three-dimensional schematic diagram of the connection structure between the arc-shaped semicircular ring and the C-shaped adjustment port of this utility model.

[0015] In the diagram: 1. Main body of the bread tube; 101. Flexible joint protective sleeve; 2. Annular support protective ring; 201. Arc-shaped semi-circular ring; 202. Bolted fixing bolt; 3. C-shaped adjustment port; 4. Snap-fit ​​mounting block; 401. Adjustment threaded port; 5. Threaded support rod; 6. Arc-shaped extrusion plate; 7. Embedded mounting parts; 8. Anti-expansion crack precast slab; 801. Cross anti-slip sleeve. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Please see Figures 1-5 A pre-embedded rigid bread tube protective sleeve includes a bread tube body 1, and an annular support and protection ring 2 is provided on the outside of the bread tube body 1. Both sides of the annular support and protection ring 2 are provided with C-shaped adjustment ports 3. The two C-shaped adjustment ports 3 are evenly engaged and slidably fitted with engagement and installation blocks 4. The engagement and installation blocks 4 are threadedly installed with threaded support rods 5 in the middle. The two ends of the threaded support rods 5 are respectively fitted with arc-shaped extrusion plates 6 and pre-embedded installation parts 7. The pre-embedded installation parts 7 are located on the outside of the annular support and protection ring 2. The arc-shaped extrusion plates 6 are extruded and positioned on the outside of the bread tube body 1. The pre-embedded installation parts 7 are fitted with anti-expansion crack prefabricated plates 8. The beneficial effects that this plan aims to achieve are: By providing C-shaped adjustment ports 3 on both sides of the annular support and protection ring 2, it is easy for the locking and mounting block 4 to slide within the C-shaped adjustment ports 3. The locking and mounting block 4 is threadedly connected to a threaded support rod 5. Rotating the threaded support rod 5 allows it to extend and retract within the locking and mounting block 4, which facilitates pushing the arc-shaped extrusion plate 6 on the threaded support rod 5 to press and fix it to the outside of the bread tube body 1, and to position the locking and mounting block 4 in the opposite direction, so that the locking and mounting block 4 can be pressed and positioned on the C-shaped adjustment port 3. The installation and positioning effect is good, and it is easy to perform multi-point clamping operations stably. The pre-embedded mounting component 7 is located outside the annular support protection ring 2, making it easy to rotate the threaded support rod 5 by hand. The annular support protection ring 2 can provide rigid outer ring protection. The pre-embedded mounting component 7 is fitted with an anti-expansion crack prefabricated plate 8, which plays an auxiliary role in anti-expansion crack protection. It has good rigid protection capability for the bread tube body 1, making the device easy to perform multi-point clamping operations and easy to adapt and stably clamp different types of bread tubes. It also protects the tube body from deformation and damage caused by external forces, and has excellent rigid protection capability.

[0019] Furthermore, the annular support and protection ring 2 is installed in a ring shape on the outside of the bread tube body 1. The outside of the bread tube body 1 is fitted with a flexible joint protection sleeve 101. Multiple arc-shaped extrusion pieces 6 are abutted and positioned on the outside of the flexible joint protection sleeve 101. The annular support and protection ring 2 corresponds to the flexible joint protection sleeve 101. Specifically, the annular support and protection ring 2 is installed in a ring shape on the outside of the bread tube body 1. The installation and positioning are stable and suitable for adjustment. The outside of the bread tube body 1 is fitted with a flexible joint protection sleeve 101. The arc-shaped extrusion piece 6 is positioned against the outside of the flexible joint protection sleeve 101. The flexible joint protection sleeve 101 has anti-corrosion and elastic resistance, and plays a protective role. The pre-embedded anti-expansion and anti-extrusion effect is good.

[0020] Furthermore, the annular support and protection ring 2 includes two arc-shaped semicircular rings 201. The two arc-shaped semicircular rings 201 are assembled in a ring shape on the outside of the bread tube body 1. Both ends of the two arc-shaped semicircular rings 201 are provided with bolts 202. The two ends of the two arc-shaped semicircular rings 201 are bolted together by the bolts 202. Two adjacent C-shaped adjustment ports 3 are correspondingly opened on the two arc-shaped semicircular rings 201. Specifically, the annular support and protection ring 2 includes two arc-shaped semicircular rings 201. The two arc-shaped semicircular rings 201 are integrally bolted together by bolting and fixing bolts 202 and are set in a ring shape on the outside of the bread tube body 1. The inner diameter of the annular support and protection ring 2 is larger than the outer diameter of the bread tube body 1, which makes it easy to adapt to the installation and bearing of different bread tube bodies 1 and has a good assembly and fixing effect.

[0021] Furthermore, multiple engaging mounting blocks 4 are H-shaped and sliding within the C-shaped adjustment port 3. An adjustment threaded port 401 is provided in the middle of the engaging mounting block 4. The threaded support rod 5 is threaded through the adjustment threaded port 401. The two ends of the threaded support rod 5 are located inside and outside the annular support protection ring 2, respectively. Specifically, the locking mounting block 4 is H-shaped and slides within the C-shaped adjustment port 3. The locking mounting block 4 is easy to move and adjust. The locking mounting block 4 has an adjustment threaded port 401 in the middle, which is convenient to support the threaded support rod 5. When the threaded support rod 5 drives the arc-shaped extrusion plate 6 to extrude the bread tube body 1, it is convenient to support and fix it, making it easy to use and operate.

[0022] Furthermore, the side of the arc-shaped extrusion piece 6 away from the threaded support rod 5 is abutted and positioned on the bread tube body 1. The arc-shaped extrusion piece 6 is concave arc-shaped, and the side of the threaded support rod 5 away from the arc-shaped extrusion piece 6 is fixedly connected to the pre-embedded mounting part 7. Specifically, the side of the arc-shaped extrusion plate 6 away from the threaded support rod 5 is abutted and positioned on the bread tube body 1. The arc-shaped extrusion plate 6 plays a good supporting and positioning role. The arc-shaped extrusion plate 6 is concave and fits the surface of the bread tube body 1, resulting in good installation and fixing effect. The side of the threaded support rod 5 away from the arc-shaped extrusion plate 6 is fixedly connected to the pre-embedded mounting part 7, which facilitates the bearing protection of the pre-embedded mounting part 7 against external vibration and extrusion in the later stage, and is convenient to use and operate.

[0023] Furthermore, the pre-embedded mounting component 7 is fixed to the threaded support rod 5 in a cross shape, and the anti-expansion precast slab 8 is vertically snapped into the bottom of the pre-embedded mounting component 7; Specifically, the pre-embedded mounting part 7 is fixed to the threaded support rod 5 in a cross shape, which makes it easy to rotate the threaded support rod 5 by hand. After the pre-embedded part 7 is embedded, the pre-embedded fastening is good, which is suitable for pre-embedding and protection. The anti-expansion crack precast plate 8 is vertically snapped into the bottom of the pre-embedded mounting part 7, which has a good fixing and protection effect and excellent adaptability.

[0024] Furthermore, a cross anti-slip sleeve 801 is embedded in the center of the anti-expansion precast slab 8. The cross anti-slip sleeve 801 is sleeved and fixed on the embedded mounting part 7. The anti-expansion precast slab 8 is limited and sleeved on the embedded mounting part 7 by the cross anti-slip sleeve 801. Specifically, a cross-shaped anti-slip sleeve 801 is embedded in the center of the anti-expansion precast slab 8, which facilitates the installation of the anti-expansion precast slab 8 on the outside of the pre-embedded mounting component 7 by the cross-shaped anti-slip sleeve 801. The pre-embedded mounting component 7 and the anti-expansion precast slab 8 play the role of pre-embedded fixation at the same time, with good rigid load-bearing and anti-expansion protection effect, and are not easy to be damaged by the bread pipe body 1 due to the thermal expansion and contraction of concrete, thus providing good protection.

[0025] How to use and how to work this device: An annular support and protection ring 2 is provided on the outside of the bread tube body 1. C-shaped adjustment ports 3 are provided on both sides of the annular support and protection ring 2, which facilitates the installation and sliding of the locking and mounting block 4 within the C-shaped adjustment ports 3. The locking and mounting block 4 is threadedly connected to a threaded support rod 5. The two ends of the threaded support rod 5 are respectively provided with an arc-shaped extrusion plate 6 and a pre-embedded mounting part 7. When the annular support and protection ring 2 is sleeved on the outside of the bread tube body 1, the threaded support rod 5 can be rotated to extend and retract within the locking and mounting block 4, which facilitates pushing the arc-shaped extrusion plate 6 on the threaded support rod 5 to press and fix it to the outside of the bread tube body 1. Multiple arc-shaped extrusion plates 6 stably press the outside of the bread tube body 1. When the arc-shaped extrusion plates 6 press the outside of the bread tube body 1, they can reverse the position of the locking and mounting block 4, which facilitates the locking and mounting block 4 to be pressed and positioned on the C-shaped adjustment port 3. The installation and positioning effect is good, which facilitates stable multi-point clamping operations and makes it easy to adapt and stably clamp different types of bread tubes. The pre-embedded mounting component 7 is located outside the annular support protection ring 2, which makes it easy to rotate the threaded support rod 5 by hand to adjust it. After positioning, the pre-embedded mounting component 7 can assist in protective pre-embedding. The annular support protection ring 2 can provide rigid outer ring protection. The pre-embedded mounting component 7 is fitted with an anti-expansion crack precast plate 8. After the whole is pre-embedded and fixed, the anti-expansion crack precast plate 8 can play an auxiliary anti-expansion crack protection role, protecting the bread tube body 1 from deformation damage caused by external forces. It has excellent rigid protection capability. The annular support and protection ring 2 is installed in a ring shape on the outside of the bread tube body 1. The installation and positioning are stable and suitable for adjustment. The outside of the bread tube body 1 is fitted with a flexible joint protection sleeve 101. The arc-shaped extrusion piece 6 is positioned against the outside of the flexible joint protection sleeve 101 to play a protective role. The pre-embedded anti-expansion and anti-extrusion effect is good. The annular support and protection ring 2 includes two arc-shaped semicircular rings 201. The two arc-shaped semicircular rings 201 are integrally bolted together by bolting and fixing bolts 202. They are set in a ring shape on the outside of the bread tube body 1. The inner diameter of the annular support and protection ring 2 is larger than the outer diameter of the bread tube body 1, which makes it easy to adapt to the installation and bearing of different bread tube bodies 1 and has a good assembly and fixing effect. The locking mounting block 4 is H-shaped and slides within the C-shaped adjustment port 3. The locking mounting block 4 is easy to move and adjust. The locking mounting block 4 has an adjustment threaded port 401 in the middle, which is convenient to support the threaded support rod 5. When the threaded support rod 5 drives the arc-shaped extrusion plate 6 to extrude the bread tube body 1, it is convenient to support and fix it, making it easy to use and operate. The side of the arc-shaped extrusion plate 6 away from the threaded support rod 5 is abutted and positioned on the bread tube body 1. The arc-shaped extrusion plate 6 plays a good supporting and positioning role. The arc-shaped extrusion plate 6 is concave and fits the surface of the bread tube body 1, resulting in good installation and fixing effect. The side of the threaded support rod 5 away from the arc-shaped extrusion plate 6 is fixedly connected to the pre-embedded mounting part 7, which facilitates the bearing protection of the pre-embedded mounting part 7 against external vibration and extrusion in the later stage, and is convenient to use and operate. The pre-embedded mounting part 7 is fixed to the threaded support rod 5 in a cross shape, which makes it easy to rotate the threaded support rod 5 by hand. After the pre-embedded part 7 is embedded, the pre-embedded fastening is good, which is suitable for pre-embedding and protection. The anti-expansion crack precast plate 8 is vertically snapped into the bottom of the pre-embedded mounting part 7, which has good fixing and protection effect and excellent adaptability. A cross-shaped anti-slip sleeve 801 is embedded in the center of the anti-expansion crack precast slab 8, which facilitates the installation of the anti-expansion crack precast slab 8 on the outside of the pre-embedded mounting component 7 by embedding the cross-shaped anti-slip sleeve 801. The pre-embedded mounting component 7 and the anti-expansion crack precast slab 8 play the role of pre-embedded fixation at the same time. It has good rigid load-bearing and anti-expansion crack protection effect, and is not easy to be damaged by the thermal expansion and contraction of concrete. It has a good protection effect. The device facilitates multi-point clamping operations, allows for stable clamping of different types of bread tubes, and protects the tube body from deformation and damage caused by external forces, providing excellent rigid protection.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. Pre-embeddable rigid bread tube protection sleeve, comprising a bread tube body (1), characterized in that: The outer side of the bread tube body (1) is provided with an annular support and protection ring (2). Both sides of the annular support and protection ring (2) are provided with C-shaped adjustment ports (3). The two C-shaped adjustment ports (3) are evenly engaged and slidably fitted with engagement and mounting blocks (4). The engagement and mounting blocks (4) are threaded with threaded support rods (5) in the middle. The threaded support rods (5) are respectively fitted with arc-shaped extrusion plates (6) and pre-embedded mounting parts (7) at both ends. The pre-embedded mounting parts (7) are located on the outside of the annular support and protection ring (2). The arc-shaped extrusion plates (6) are extruded and positioned on the outside of the bread tube body (1). The pre-embedded mounting parts (7) are fitted with anti-expansion and cracking prefabricated plates (8).

2. A pre-embeddable rigid bread tube protection sleeve according to claim 1, characterised in that: The annular support and protection ring (2) is installed in a ring shape on the outside of the bread tube body (1). The bread tube body (1) is fitted with a flexible joint protection sleeve (101). Multiple arc-shaped extrusion pieces (6) are positioned against the outside of the flexible joint protection sleeve (101). The annular support and protection ring (2) corresponds to the flexible joint protection sleeve (101).

3. The pre-embeddable rigid bread tube protection sleeve of claim 1, wherein: The annular support and protection ring (2) includes two arc-shaped semicircular rings (201). The two arc-shaped semicircular rings (201) are assembled in a ring shape on the outside of the bread tube body (1). Both ends of the two arc-shaped semicircular rings (201) are provided with bolts (202). The two ends of the two arc-shaped semicircular rings (201) are bolted together by bolts (202). Two adjacent C-shaped adjustment ports (3) are opened on the two arc-shaped semicircular rings (201).

4. The pre-embeddable rigid bread tube protection sleeve of claim 1, wherein: Multiple locking mounting blocks (4) are H-shaped and sliding in the C-shaped adjustment port (3). The locking mounting block (4) has an adjustment threaded port (401) in the middle. The threaded support rod (5) is threaded through the adjustment threaded port (401). The two ends of the threaded support rod (5) are located inside and outside the annular support protection ring (2).

5. The pre-embeddable rigid bread tube protection sleeve of claim 1, wherein: The arc-shaped extrusion piece (6) is positioned on the bread tube body (1) on the side away from the threaded support rod (5). The arc-shaped extrusion piece (6) is concave arc-shaped. The side of the threaded support rod (5) away from the arc-shaped extrusion piece (6) is fixedly connected to the pre-embedded mounting part (7).

6. The pre-embeddable rigid bread tube protection sleeve of claim 1, wherein: The pre-embedded mounting component (7) is fixed in a cross shape on the threaded support rod (5), and the anti-expansion precast plate (8) is vertically fitted and sleeved on the bottom of the pre-embedded mounting component (7).

7. The pre-embeddable rigid bread tube protection sleeve of claim 1, wherein: A cross anti-slip sleeve (801) is embedded in the center of the anti-expansion precast slab (8). The cross anti-slip sleeve (801) is sleeved and fixed on the pre-embedded installation part (7). The anti-expansion precast slab (8) is limited and sleeved on the pre-embedded installation part (7) by the cross anti-slip sleeve (801).