CN115075134A - A sling anchor cup protective structure with fire resistance and shock absorption functions - Google Patents

Abstract

The invention discloses a sling anchor cup protection structure with fire resistance and shock absorption functions. The sealing cover body is a cylindrical body with two ends open, and the sealing package is fixed on the outside of the sling anchor cup; the inner surface of the sealing cover body has A sealing fire-resistant layer; an isolation gap is formed between the sealing cover body and the sling anchor cup; the inner support sleeve is tightly attached to the outer side wall of the sling anchor cup; the shock absorption bracket is connected to the outer side wall of the inner support sleeve , and is pressed tightly between the sealing cover body and the inner support sleeve, the shock-absorbing bracket can be squeezed and deformed, and the shock-absorbing bracket is provided with an energy-dissipating spring. In the invention, a sealing cover body is arranged on the outer side of the sling anchor cup to realize isolation and fire prevention, and the vibration is transmitted to the energy dissipation spring through the deformation of the shock-absorbing bracket, and the shock-absorbing bracket is used to provide a strong supporting structure to ensure the stable installation of the sealing cover body. It uses the deformation of the shock-absorbing bracket to transmit the vibration energy to the energy-dissipating spring, and at the same time meets the functional requirements of stable support and vibration consumption.

Description

A sling anchor cup protective structure with fire resistance and shock absorption functions

technical field

The invention relates to the technical field of sling anchor cup fire resistance, and more particularly to a sling anchor cup protective structure with fire resistance and shock absorption functions.

Background technique

The cable system (main cable, suspension cable, etc.) of a suspension bridge is the key stress-bearing structure of the cable system bridge, commonly known as the "lifeline" of the bridge. Ensuring the safety and durability of the cable system is the top priority in the construction and operation of the cable system bridge. The main cables and slings of most suspension bridges have been protected against fire and heat insulation. Because the sling anchor cup is poured with zinc-copper alloy with a melting point of about 400°C, and the sling anchor cup has not been fire-resistant yet. Thermal seal protection.

Therefore, in order to greatly improve the disaster prevention and anti-corrosion capabilities of the cable system bridge, ensure the safety and stability of the cable system bridge, prolong the safe operation life of the bridge, and ensure the safe and efficient operation of the bridge during the operation period, the lifting of the sling anchor cup The significance of cable protection is very important.

However, in the experiment, it was found that although the fire-proof and fire-resistant cover on the outside of the sling anchor cup can play a fire-resistant role, the cables of the suspension bridge are often in a vibrating state due to the influence of wind, which leads to the structure of the cover on the outside. The form will generate frequent vibrations, affecting the stability of the cable and the overall installation effect.

Therefore, it is an urgent problem for those skilled in the art to provide a protective structure for the sling anchor cup, which can balance the effects of fire resistance and shock absorption.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a sling anchor cup protection structure with fire resistance and shock absorption functions, aiming at solving the above technical problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

A sling anchor cup protective structure with fire resistance and shock absorption functions, comprising:

a sealing cover body; the sealing cover body is a cylindrical body with two ends open, and the sealing package is fixed on the outside of the sling anchor cup; the inner surface of the sealing cover body has a sealing fire-resistant layer; the sealing cover body and the An isolation gap is formed between the sling anchor cups;

an inner support sleeve; the inner support sleeve is tightly fitted on the outer side wall of the sling anchor cup;

A shock-absorbing bracket; the shock-absorbing bracket is connected to the outer side wall of the inner support sleeve, and is pressed between the sealing cover body and the inner support sleeve, and the shock-absorbing bracket can be squeezed deformation, and the shock-absorbing bracket is provided with an energy dissipation spring.

Through the above technical solutions, the sling anchor cup protection structure provided by the present invention is provided with a sealing cover body on the outer side of the sling anchor cup to achieve isolation and fire prevention, and the shock-absorbing bracket is connected through the inner support sleeve fixed on the sling anchor cup so that the The shock-absorbing bracket is supported between the sealing cover body and the inner support sleeve, and the vibration is transmitted to the energy-dissipating spring through the deformation of the shock-absorbing bracket. It uses the deformation of the shock-absorbing bracket to transmit the vibration energy to the energy-dissipating spring, and at the same time meets the functional requirements of stable support and vibration consumption, and has a good shock-absorbing effect.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, the shock absorption bracket further includes a support rod; the number of the support rod is two, and a long strip is opened in the middle of the support rod. The two supporting rods are arranged in an X-shaped cross, and are fastened and connected through the two elongated holes through the cooperation of the locking bolt and the locking nut; the two ends of the two supporting rods on the same side The heads are respectively connected with the two hinge seats on the inner support sleeve through pins, and the two end heads on the other side of the two support rods are pressed against the inner side wall of the sealing cover body; the energy dissipation The number of the springs is two, and the two ends are respectively pressed and fixed in the upper and lower fork openings of the X-shaped structure formed by the two support rods.

The beneficial effects of adopting the above technical solutions are as follows: the present invention adopts the X-shaped cross structure as the shock-absorbing bracket, and the X-shaped cross structure has good structural stability and adjustability. During vibration, the vibration energy is transmitted to the The energy-dissipating spring can also provide elastic force to the X-type bracket. At the same time, the connection form of the elongated hole ensures that the X-type bracket has a certain elastic deformation ability, which can have a long service life and maintain a long use effect. .

It should be noted that the locking bolts and locking nuts of the X-shaped bracket provided by the present invention are in a fastened state during installation, and in order to facilitate positioning, one end of the elongated hole can be used as a connection point during manufacture, and tightened. During deformation, with the deformation of the support rod, the fastening points of the locking bolt and the locking nut gradually move along the elongated hole, so that the X-shaped bracket is deformed to meet the support strength.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, an arc-shaped fitting plate is provided on the end of the support rod that is pressed against the inner side wall of the sealing cover body.

The beneficial effect of adopting the above technical solutions is that the structure of the arc-shaped cladding plate can make the shock-absorbing bracket of the X-shaped cross structure fit more closely with the inner side wall of the sealing cover body.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, the number of the shock absorption brackets is 4, and the shock absorption brackets are evenly arranged around the outer side of the inner support sleeve.

The beneficial effects of adopting the above technical solutions are: four shock-absorbing brackets are arranged around the outer side of the inner support sleeve, which can meet the shock-absorbing requirements from different directions, and the control effect is better.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, the inner side wall of the inner support sleeve has a rubber layer.

The beneficial effects of adopting the above technical solutions are: by arranging the rubber layer, the friction between the inner support sleeve and the sling anchor cup can be improved, the integrity between the inner support sleeve and the sling anchor cup can be improved, and at the same time, the Shock absorption and energy dissipation.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, the sealing and fire-resistant layer includes two layers of flame-retardant and fire-resistant sealant coating layers, and the two layers of the Composite fiber fire-resistant insulation tape between coating layers of flame-retardant and fire-resistant sealant.

The beneficial effect of adopting the above technical scheme is that the use requirements and effects of fire isolation can be met through the coordinated use of two layers of flame-retardant and fire-resistant sealant and the composite fiber fire-resistant heat-insulating tape.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption function, the sealing cover body includes two first half shells equally divided along the plane where the center axis is located, the first half shells The edge of the butt joint of the shell has a first convex plate protruding outward; the two first half shells are connected to the two first convex plates that are butted together by a first bolt.

The beneficial effects of the above technical solutions are: the split structure of the half shell can meet the assembly and sleeve requirements of the outer side of the sling anchor cup, and the bolt fastening method has the advantages of simple, convenient and reliable connection.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, rubber sealing strips are embedded in the butt edges of the two first half shells; The butt edge surfaces of the shell are coated with a flame retardant and fire resistant sealant.

The beneficial effects of adopting the above technical solutions are: the rubber sealing strip can improve the sealing performance after the butt joints of the half-shells, and can improve the integrity of the assembled half-shells. The application of flame-retardant and fire-resistant sealant at the butt joints of the half shells can prevent fire failure due to improper protection of the butt joints.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, the inner support sleeve includes two second half shells equally divided along the plane where the center axis is located, the second half shells The edge of the butt seam of the half-shells has a second flange plate protruding outward; the two second half-shells are connected to the two second flange plates that fit and butt through a second bolt. .

The beneficial effects of the above technical solutions are: the split structure of the half shell can meet the assembly and sleeve requirements of the outer side of the sling anchor cup, and the bolt fastening method has the advantages of simple, convenient and reliable connection.

Preferably, in the above-mentioned sling anchor cup protection structure with fire resistance and shock absorption functions, the abutting surfaces of the two first half-shells and the abutting surfaces of the two second half-shells are perpendicular to each other .

The beneficial effects of adopting the above technical solutions are as follows: the staggered assembly and connection methods can make the outward forces of the two different, and the structural stability can be improved.

As can be seen from the above technical solutions, compared with the prior art, the present invention provides a sling anchor cup protection structure with fire resistance and shock absorption functions, which has the following beneficial effects:

1. The sling anchor cup protection structure provided by the present invention is provided with a sealing cover body on the outside of the sling anchor cup to achieve isolation and fire prevention, and is connected to the shock-absorbing bracket through the inner support sleeve fixed on the sling anchor cup so that the shock-absorbing bracket is It is supported between the sealing cover body and the inner support sleeve, and the vibration is transmitted to the energy dissipating spring through the deformation of the shock-absorbing bracket. The deformation of the shock-absorbing bracket transmits the vibration energy to the energy-dissipating spring, and at the same time meets the functional requirements of stable support and vibration consumption, and has a good shock-absorbing effect.

2. The present invention adopts the X-shaped cross structure as the shock-absorbing bracket. The X-shaped cross structure has good structural stability and adjustability. During the vibration, the vibration energy is transmitted to the energy-dissipating spring through the deformation of the X-shaped bracket, and the energy is dissipated at the same time. The spring can also provide elastic force to the X-shaped bracket, and at the same time, the connection form of the elongated hole ensures that the X-shaped bracket has a certain elastic deformation ability, can have a long service life, and maintain a long-term use effect.

3. The X-shaped bracket provided by the present invention uses a long hole structure, so that the support rod can gradually guide the deformation of the X-shaped bracket with the plastic deformation and the elastic action of the energy dissipation spring, and support it, which can meet the support strength and stability, Greatly improve the service life and use effect.

4. The X-shaped bracket of the present invention utilizes the length characteristic of the elongated hole and uses one end as the connection point, which can limit the initial fixing position of the two support rods, and the connection and positioning are more convenient.

5. The X-shaped bracket of the present invention adopts bolt connection and end-head hinged connection. When the long-term use fails, the overall structure can be replaced by replacing the support rod, locking bolt, locking nut or pin, which is easy to replace the structure and prevent cost loss.

6. The present invention is provided with a sealing cover body on the outer side of the existing sling anchor cup, and a sealing fire-resistant layer is processed on the inner surface of the sealing cover body, which can realize the fire isolation protection of the sling anchor cup and ensure the bridge system of the cable system. It can improve the safety and stability of the bridge, prolong the safe operation life of the bridge, ensure the safe and efficient operation of the bridge during the operation period, and greatly improve the disaster prevention and anti-corrosion capabilities of the cable system bridge.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic diagram of the external structure of the sling anchor cup protective structure provided by the present invention;

Fig. 2 accompanying drawing is the structural schematic diagram after half-section of the sling anchor cup protective structure provided by the present invention;

3 is a schematic structural diagram of a sealing cover body provided by the present invention;

4 is a schematic structural diagram of the first half-shell provided by the present invention;

Fig. 5 accompanying drawing is the sectional view of the sealing cover body and the sealing fire-resistant layer provided by the present invention;

6 is a schematic diagram of the protective structure of the sling anchor cup provided by the present invention after removing the sealing cover body;

Figure 7 is a schematic structural diagram of the inner support sleeve provided by the present invention;

8 is a schematic diagram of the front structure of the shock-absorbing bracket provided by the present invention;

FIG. 9 is a schematic diagram of the rear structure of the shock absorbing bracket provided by the present invention.

in:

1-The body of the sealing cover;

11-Isolation gap; 12-First half shell; 13-First flange plate; 14-First bolt piece; 15-Lock ring; 16-Conical reducing section; 17-Cylinder section;

2-Inner support sleeve;

21-Hinged seat; 22-Second half shell; 23-Second flange plate; 24-Second bolt piece;

3- shock-absorbing bracket;

31-energy dissipation spring; 32-support rod; 321-long hole; 33-locking bolt; 34-locking nut; 35-arc-shaped fitting plate;

4- Sling anchor cup;

5- Seal the fire-resistant layer;

51- Fire-retardant and fire-resistant sealant coating; 52- Composite fiber fire-resistant thermal insulation tape.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to Figure 1 and Figure 2, an embodiment of the present invention discloses a sling anchor cup protection structure with fire resistance and shock absorption functions, including:

The sealing cover body 1; the sealing cover body 1 is a cylindrical body with two ends open, and the sealing package is fixed on the outside of the sling anchor cup 4; the inner surface of the sealing cover body 1 has a sealing fire-resistant layer 5; the sealing cover body 1 and the sling An isolation gap 11 is formed between the anchor cups 4;

The inner support sleeve 2; the inner support sleeve 2 is fastened to the outer side wall of the sling anchor cup 4;

The shock-absorbing bracket 3; the shock-absorbing bracket 3 is connected to the outer side wall of the inner support sleeve 2, and is tightly pressed between the sealing cover body 1 and the inner support sleeve 2, the shock-absorbing bracket 3 can produce extrusion deformation, and reduce the An energy dissipation spring 31 is provided on the shock stand 3 .

Example 1:

Referring to FIGS. 3 and 4 , the sealing cover body 1 includes two first half shells 12 which are equally divided along the plane where the axis of the first half shell is located. Plate 13; the two first half-shells 12 are connected to the two first flange plates 13 that are butted together by first bolts 14.

For the shape design of the sealing cover body 1, it is generally designed according to the shape of the sling anchor cup 4:

The sealing cover body 1 includes a locking ring 15, a conical reducing section 16 and a cylindrical section 17 formed coaxially in sequence; The cylindrical section 17 is located outside the sling anchor cup 4 , the bottom edge of the cylindrical section 17 has a radially inwardly protruding closed ring 18 , and the inner ring of the closed ring 18 presses against the bottom edge of the sealing sling anchor cup 4 .

Example 2:

Referring to FIG. 5 , the sealing and fire-resistant layer 5 includes two layers of flame-retardant and fire-resistant sealant coating layers 51 , and a composite fiber fire-resistant heat insulation tape 52 bonded between the two layers of flame-retardant and fire-resistant sealant coating layers 51 .

In order to further optimize the above technical solution, rubber sealing strips are embedded in the butting edges of the two first half-shells 12 ; the surfaces of the butting edges of the two first half-shells 12 are coated with a flame-retardant and fire-resistant sealant.

In this embodiment, the sealing cover body 1 is made of 304 stainless steel with a thickness of 3 mm. The flame-retardant and fire-resistant sealant coating layer 51 and the flame-retardant and fire-resistant sealant are all made of B-FRS flame-retardant silica gel; The gel is the main raw material, and the glass fiber is the reinforcing material. The thickness of the two layers of flame-retardant and fire-resistant sealant coating layers 51 are both 1000 μm; the thickness of the composite fiber fire-resistant and heat-insulating tape 52 is 4±1 mm.

The sealing cover body 1 and the sealing fire-resistant layer 5 are constructed according to the following process and sequence:

①Cleaning the inner surface of the sealing cover body 1: Remove the dirt on the inner surface of the sealing cover body 1, such as dust, oil, etc., until the inner surface of the sealing cover body 1 is clean and dry.

②The first coating layer 51 of flame-retardant and fire-resistant sealant is scraped: apply flame-retardant and fire-resistant sealant on the inner surface of the sealing cover body 1, and use a special scraper to scrape the flame-retardant and fire-resistant sealant onto the sealing cover body 1. On the inner surface, the thickness of the flame retardant and fire resistant sealant coating is about 1000 μm. Be careful not to leak coating, blistering, etc.

③Construction of composite fiber fire-resistant and heat-insulating tape 52, referred to as FCFR fire-resistant tape for short: paste the FCFR fire-resistant tape on the first coating layer 51 of flame-retardant and fire-resistant sealant scraped on the inner surface of the sealing cover body 1, and the joints should be Tight and neat with no obvious gaps.

④ The second layer of flame retardant and fire-resistant sealant coating layer 51 is scraped: after the construction of the FCFR fire-resistant tape is completed, scrape the second layer of flame-retardant and fire-resistant sealant, and use a special scraper to scrape the flame-retardant and fire-resistant sealant. To the surface of the FCFR fire-resistant tape, the thickness of the flame-retardant and fire-resistant sealant coating is about 1000 μm. Note that for the appearance of the finished product, the surface of the second layer of flame-retardant and fire-resistant sealant should be uniform and smooth without defects, and pinholes, cracks, falling off, and missing coating are not allowed.

⑤ Install rubber sealing strips on the butt surfaces of the stainless steel sealing cover body 1, and then coat all butt surfaces with flame-retardant and fire-resistant sealants.

Example 3:

Referring to Figures 6 to 9, the shock-absorbing bracket 3 further includes support rods 32; the number of support rods 32 is two, and a long hole 321 is opened in the middle, and the two support rods 32 are arranged in an X-shaped cross, and Through the cooperation of the locking bolts 33 and the locking nuts 34, they are fastened through the two elongated holes 321; Through the pin shaft connection, the two ends of the other side of the two support rods 32 are pressed against the inner side wall of the sealing cover body 1; Inside the upper and lower forks of the X-shaped structure formed by the rod 32 .

In order to further optimize the above technical solution, an arc-shaped fitting plate 35 is provided on the end of the support rod 32 that is pressed against the inner side wall of the sealing cover body 1 .

In order to further optimize the above technical solution, the inner side wall of the inner support sleeve 2 is provided with a rubber layer.

In order to further optimize the above technical solution, the inner support sleeve 2 includes two second half shells 22 which are equally divided along the plane where the axis of the second half shell 22 is located. The edge plate 23; the two second half shells 22 are connected to the two second flange plates 23 that are butted together by means of second bolts 24.

In order to further optimize the above technical solution, the abutting surfaces of the two first half-shells 12 and the abutting surfaces of the two second half-shells 22 are perpendicular to each other.

In this embodiment, the number of the shock-absorbing brackets 3 is 4, and they are evenly arranged around the outer side of the inner support sleeve 2 .

The assembling method of this embodiment is:

First, lock the shock-absorbing bracket 3. In order to facilitate the positioning, the end of the long hole 321 close to the inner support sleeve 2 is used as the connection point, and the locking bolt 33 and the locking nut 34 are tightened. The radially protruding length of the shock mount 3 is the gap length of the isolation gap 11 .

The two second half-shells 22 of the adjusted shock-absorbing bracket 3 are sheathed on the outside of the sling anchor cup 4 for fixing. For the structure where the outer diameter of the sling anchor cup 4 is not uniform, the second half-shell 22 can be connected with the suspender. The gap between the anchor cups 4 is filled with foam glue. The two second flange plates 23 that are butted together are connected by the second bolts 24 , so that the two second half-shells 22 are fastened.

Install the sealing cover body 1 on the outside of the sling anchor cup 4 and the shock-absorbing bracket 3, and fasten all the first bolts 14 on the sealing cover body 1 to complete the sealing protection of the sling anchor cup 5. After the installation is completed, The shock-absorbing bracket 3 is pressed against the inner side wall of the sealing cover body 1 .

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a hoist cable anchor cup protective structure with fire-resistant and shock-absorbing function which characterized in that includes:

a seal boot body (1); the sealing cover body (1) is a cylindrical body with openings at two ends, and is hermetically wrapped and fixed on the outer side of the sling anchor cup (4); the inner surface of the sealing cover body (1) is provided with a sealing fireproof layer (5); an isolation gap (11) is formed between the sealing cover body (1) and the sling anchor cup (4);

an inner support sleeve (2); the inner support sleeve (2) is tightly attached to the outer side wall of the sling anchor cup (4);

a shock-absorbing bracket (3); the shock absorption support (3) is connected to the outer side wall of the inner support sleeve (2) and tightly props between the sealing cover body (1) and the inner support sleeve (2), the shock absorption support (3) can generate extrusion deformation, and an energy dissipation spring (31) is arranged on the shock absorption support (3).

2. A sling anchor cup protecting structure with fire and shock resisting functions as claimed in claim 1, wherein the shock absorbing bracket (3) further comprises a support bar (32); the number of the support rods (32) is two, the middle parts of the support rods are provided with strip holes (321), the two support rods (32) are arranged in an X-shaped crossed manner and penetrate through the two strip holes (321) to be tightly connected through the matching of locking bolts (33) and locking nuts (34); two end heads on the same side of the two support rods (32) are respectively connected with two hinged seats (21) on the inner support sleeve (2) through pin shafts, and two end heads on the other side of the two support rods (32) are tightly propped against the inner side wall of the sealing cover body (1); the number of the energy dissipation springs (31) is two, and two ends of the energy dissipation springs are respectively and tightly fixed in an upper fork and a lower fork of an X-shaped structure formed by the two support rods (32).

3. The structure of claim 2, wherein the end of the support rod (32) abutting against the inner side wall of the sealing cover body (1) is provided with an arc-shaped abutting plate (35).

4. A sling anchor cup guard structure with fire and shock resisting function according to any one of claims 1-3, wherein the number of shock absorbing brackets (3) is 4 and is evenly arranged around the outside of the inner support sleeve (2).

5. A sling anchor cup guard structure with fire and shock resisting function as claimed in claim 1, wherein the inner side wall of the inner support sleeve (2) is provided with a rubber layer.

6. The sling anchor cup protective structure with fire and shock resistant function according to claim 1, wherein the sealing fire resistant layer (5) comprises two flame retardant fire resistant sealant coating layers (51), and a composite fiber fire resistant thermal insulation tape (52) bonded between the two flame retardant fire resistant sealant coating layers (51).

7. A fire and shock resistant roundabout anchor cup guard structure according to any one of claims 1 to 3 and 5 to 6, wherein said boot seal body (1) comprises two first half shells (12) equally divided along a plane of a central axis thereof, and wherein a pair of joint edges of said first half shells (12) have first convex edge plates (13) protruding outward; the two first half shells (12) are connected with the two first flange plates (13) which are butted in an abutting mode through first bolt pieces (14).

8. The structure of claim 7, wherein the abutting edges of the two first half shells (12) are embedded with rubber sealing strips; the abutting edge surfaces of the two first half shells (12) are coated with a flame-retardant fire-resistant sealant.

9. A fire and shock resistant fall anchor cup guard structure as claimed in claim 7 wherein said inner support sleeve (2) comprises two second half shells (22) equally spaced along the plane of its central axis, the butt seam edges of said second half shells (22) having outwardly convex second ledge plates (23); the two second half shells (22) are connected with the two second flange plates (23) which are butted in an abutting mode through second bolt pieces (24).

10. A fire and shock resistant fall anchor cup guard structure as claimed in claim 9 wherein the abutment surfaces of the two first half shells (12) and the abutment surfaces of the two second half shells (22) are perpendicular to each other.

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