CN113089934A - Embedded tension-compression dispersion type anchor backing plate and construction method - Google Patents

Abstract

The invention discloses an embedded tension-compression dispersion type anchor backing plate and a construction method thereof, wherein the anchor backing plate comprises a web pull plate with a hollow structure, a main bearing plate with a through hole is fixedly arranged at the first end of the web pull plate, the inner diameter of the main bearing plate is smaller than that of the first end of the web pull plate, and the outer diameter of the main bearing plate is larger than that of the first end of the web pull plate; the second end of the web-pulling plate is fixedly provided with a first secondary bearing plate with a through hole, the outer diameter of the first secondary bearing plate is larger than that of the second end of the web-pulling plate, and the first secondary bearing plate is also provided with a fixed joint. The embedded tension-compression dispersion type anchor backing plate and the construction method thereof disclosed by the invention have the advantages that the multi-stage bearing plate can be fully utilized, the dispersion stress is uniform, and the inter-axial distance size of an anchor can be reduced under the working condition of the same prestress.

Description

Embedded tension-compression dispersion type anchor backing plate and construction method

Technical Field

The invention relates to an anchor backing plate, in particular to an embedded type tension-compression dispersion type anchor backing plate and a construction method.

Background

In recent years, the circular tower type cast anchor backing plate is widely applied because the multistage bearing plate is adopted to disperse the concrete stress under the anchor. But many steps of circular tower type anchor backing plate has set up main bearing plate at top terminal surface (fig. 1), and the rigid coupling point sets up usually on main bearing plate for with pouring template fixed connection, mainly rely on the horn tube between the bearing plate to transmit the compressive stress of main bearing plate to secondary bearing plate in proper order, this type of anchor backing plate still has following technological not enough:

1. the anchor backing plate mainly transfers the pressure stress from the top end surface to the concrete, the flared tube mainly plays a role in transition to the connection of a pore channel, generally considering the utilization of materials, the flared tube can be designed to be thin, the structural rigidity of the top end surface is designed to be large, so the impact of the thickness and the initial stress part of the flared tube is received, once the main bearing plate surface generates plastic bending deformation, the stress can be concentrated to generate larger split stress, and the secondary bearing plate surface with a smaller bearing surface can not provide corresponding protection, so the mechanical property of the main bearing plate surface of the anchor backing plate plays a decisive role, the secondary bearing plate plays a smaller role, the integral stress dispersion effect of the anchor backing plate is not facilitated, and the anchor backing plate is difficult to meet the requirement of smaller and smaller anchoring space;

2. the top end face is usually connected with a pouring template, so that an anchored anchor plate is usually arranged outside the beam end face (figure 2), secondary vertical die pouring is needed for sealing the anchor, the appearance is not attractive, shrinkage cracks are easy to generate due to the fact that the age of the anchor plate is inconsistent with that of a beam, and when a prefabrication assembly technology is used, the anchor device protrudes out of the beam end face, so that arrangement of reinforcing steel bars at joints and connection of pore channels are not facilitated, the width of wet joints is increased, and the engineering cost is improved;

3. to using the mode that the stretch-draw notch buries the ground tackle into the beam-ends, need additionally to set up the ground tackle notch (fig. 3) before pouring to need guarantee the sealed of notch and beam form, in order not to influence the follow-up stretch-draw of thick liquids infiltration influence, for guaranteeing not interfering the grout hole and be convenient for stretch-draw, can reserve great notch size usually, to the whole adverse effect that produces of structure, still need the secondary to found the mould to pour and be used for sealing the anchor after accomplishing the pore grout simultaneously, influence the beam-ends roughness.

Disclosure of Invention

Aiming at the problems, the invention provides an embedded tension-compression dispersion type anchor backing plate and a construction method, aiming at solving the problem that the existing anchor backing plate is damaged due to the fact that greater splitting stress is generated by stress concentration after the main bearing plate surface of the anchor backing plate generates plastic bending deformation; the secondary bearing plate has a smaller effect and larger distance between the primary bearing plate and the secondary bearing plate; the anchor plate is externally arranged on the end surface of the beam, so that the structure is not attractive, the width of a wet joint is large, and the engineering cost is high; and secondary vertical mold pouring is needed for sealing anchors after pore grouting is completed.

The invention adopts the following technical scheme to realize the purpose:

an embedded type tension-compression dispersion type anchor backing plate comprises a web pulling plate with a hollow structure, wherein a main bearing plate with a through hole is fixedly arranged at the first end of the web pulling plate, the inner diameter of the main bearing plate is smaller than that of the first end of the web pulling plate, and the outer diameter of the main bearing plate is larger than that of the first end of the web pulling plate; the second end of the web-pulling plate is fixedly provided with a first secondary bearing plate with a through hole, the outer diameter of the first secondary bearing plate is larger than that of the second end of the web-pulling plate, and the first secondary bearing plate is also provided with a fixed joint.

In the technical scheme, a main bearing plate is used for being matched with an anchor plate to anchor a prestressed tendon, the inner edge of the main bearing plate extends towards the inside of a web pulling plate to form a step in clamping fit with the anchor plate, the anchor plate is matched with the main bearing plate in the web pulling plate, the main bearing plate and a first secondary bearing plate respectively form a main bearing step and a first secondary bearing step in matching with concrete on the outer ring of the web pulling plate, and the first secondary bearing plate positioned at the top end of an anchor backing plate is provided with a fixed connection point fixedly connected with a pouring template; firstly, in the process of stress: the main bearing plate of the anchor backing plate is stressed through the main bearing step, because the elastic modulus of the concrete is smaller than that of the anchor backing plate casting, and under the condition of the same stress, the micro strain of the anchor backing plate is smaller than that of the concrete, when the main bearing step bears the compressive stress to a certain degree, the first secondary bearing plate can be influenced by the tensile stress of the web-pulling plate to start sharing partial compressive stress, so as to achieve the purpose of dispersing the stress, and the anchor backing plate in the technical scheme can fully utilize the two bearing plates; secondly, compared with the anchor backing plate in the prior art, the stress diffusion is more uniform, and the inter-axial distance of the anchor can be reduced under the condition of applying the same prestress.

The further technical scheme is that the anchor backing plate is used for anchoring the prestressed tendons in cooperation with the anchor plate, and the axial length of the web plate is greater than that of the anchor plate. In the technical scheme, the anchor plate can be embedded into the anchor backing plate (namely, into the inner cavity of the web-pulling plate), when the top end surface of the anchor backing plate (namely, the first secondary bearing plate) is connected with the pouring template, a tensioning notch does not need to be preset, after concrete pouring and tensioning are completed, the anchor sealing process can be completed only through pore grouting, extra formwork erection and anchor sealing are not needed, the construction efficiency is improved, and the engineering cost is saved;

the further technical scheme is that a reinforcing rib is fixedly arranged on an outer ring of the web plate along the axial direction of the web plate, and two ends of the reinforcing rib are fixedly connected with the main bearing plate and the first secondary bearing plate respectively. In the technical scheme, the top end face of the anchor backing plate (namely the first secondary bearing plate) is driven to disperse the compressive stress by the tension of the web pulling plate and the reinforcing rib.

The further technical proposal is that the device also comprises a horn tube fixedly connected with the main bearing plate. The other end of the horn pipe in the technical scheme is connected with the embedded pipeline and used for wrapping the prestressed tendons.

The further technical scheme is that the device further comprises a belly pressure plate with a hollow structure, one end of the belly pressure plate is fixedly connected with the main bearing plate, and the outer ring of the other end of the belly pressure plate is fixedly provided with a second secondary bearing plate. According to the technical scheme, the anchor backing plate is combined with the anchor backing plate in the prior art for use, the main bearing surface is arranged in the middle of the anchor backing plate, and the compression stress is transmitted to the first secondary bearing plate through the web pull plate and is transmitted to the second secondary bearing plate through the web press plate, so that the compression stress of all stages of bearing plates of the anchor backing plate is uniformly dispersed.

The technical scheme is that the device further comprises a grouting channel which sequentially penetrates through the end face of the first secondary bearing plate, the side wall of the web-pulling plate and the inner wall of the main bearing plate. The technical scheme can utilize the grouting pore passage to carry out pore passage grouting.

The anchor backing plate construction method comprises the embedded tension-compression dispersion type anchor backing plate, a horn tube and an embedded pore passage, wherein the anchor backing plate is used for anchoring prestressed tendons in cooperation with an anchor plate, and the construction method comprises the following steps:

1) fixedly connecting the pouring template with a fixed connection point on the first secondary bearing plate, and fixedly connecting the horn tube with the end face of the main bearing plate positioned outside the web pulling plate; the pouring template and the first secondary bearing plate, the horn tube and the main bearing plate can be effectively and mechanically connected in a bolt or clamping groove mode;

2) pushing the pre-buried pore channel into the horn tube, and performing connection and gap sealing; the sealing connection can be performed by winding a sealing adhesive tape or using a heat-shrinkable sleeve;

3) pouring concrete; pouring concrete into the pouring template;

4) removing the mold and completing maintenance, then penetrating, pushing the anchor plate into the inner cavity of the web-pulling plate after the prestressed tendons penetrate through the anchor plate, installing, limiting and tensioning;

5) after tensioning is completed, cutting off redundant prestressed tendons, and carrying out a grouting process.

The invention has the beneficial effects that:

1. in the process of stress: the main bearing plate of the anchor bearing plate is stressed through the main bearing step, the elastic modulus of the concrete is smaller than that of the cast anchor bearing plate, and the micro strain of the anchor bearing plate is smaller than that of the concrete under the condition of the same stress, so that when the first secondary bearing plate bears a certain compressive stress, the first secondary bearing plate can be influenced by the tensile stress of the tensile plate to start sharing part of the compressive stress, and the purpose of dispersing the stress is achieved, therefore, the anchor bearing plate in the technical scheme can fully utilize the two bearing plates

2. The anchor plate can be embedded into the anchor backing plate (namely, the inner cavity of the web-pulling plate), when the top end surface of the anchor backing plate (namely, the first-stage bearing plate) is connected with the pouring template, a notch does not need to be preset, after concrete pouring and tensioning are completed, the anchor sealing process can be completed only through pore grouting, additional formwork erection and anchor sealing are not needed, the construction efficiency is improved, and the engineering cost is saved;

3. compared with the anchor backing plate in the prior art, the stress diffusion is more uniform, and the inter-axial distance of the anchor can be reduced under the condition of applying the same prestress.

Drawings

FIG. 1 is a diagram: the prior art is the structural schematic diagram of the matching of the anchor backing plate and the anchor plate.

FIG. 2 is a diagram of: the structure schematic diagram of the anchor backing plate after construction in the prior art.

FIG. 3 is a diagram of: the prior art is provided with a schematic structural diagram of an anchor backing plate with a tensioning notch after construction.

FIG. 4 is a diagram of: the invention discloses a structural schematic diagram of the matching of an anchor backing plate, a horn tube and an embedded tube.

FIG. 5 is a diagram: the invention relates to a three-dimensional view of the matching of an anchor backing plate and a flared tube.

FIG. 6 is a diagram of: the invention discloses a structural schematic diagram of the matching of an anchor backing plate and an anchor plate.

FIG. 7 is a diagram of: the invention discloses a structural schematic diagram of an anchor backing plate after concrete pouring construction.

FIG. 8 is a diagram of: the invention discloses a structural schematic diagram of an anchor backing plate after grouting construction.

FIG. 9 is a diagram of: the invention discloses a structural schematic diagram of an anchor backing plate with grouting holes.

FIG. 10 is a diagram: the invention discloses a schematic structure of an anchor backing plate with a belly pressure plate.

In the figure:

1. a belly plate; 10. an inner cavity; 2. a main bearing plate; 31. a first secondary bearing plate; 310. fixing the contact; 30. grouting a pore channel; 32. a second secondary bearing plate; 4. reinforcing ribs; 5. a flare tube; 51. pre-burying a pipe; 6. an abdominal compression plate; 7. an anchor plate; 70. grouting holes of the anchor plates; 8. pouring a template; 81. stretching the notch; 9. a pulp pressing plate; 90. grouting holes of the grouting plates.

Detailed Description

The present invention will be described in detail below with reference to comparative examples and embodiments and fig. 1 to 10, and features in the following examples and examples may be combined with each other without conflict.

Comparative example:

as shown in fig. 1 to 3, the conventional anchor backing plate is manufactured by an integral casting molding process, and as shown in fig. 1, the anchor backing plate comprises a main bearing plate 2, a horn tube 5 and a secondary bearing plate 3 which are sequentially connected from top to bottom, wherein the main bearing plate 2 is positioned at one end with a larger tube opening of the horn tube 5, and the other end with a smaller tube opening is connected with an embedded tube 51, the main bearing plate 2 is of a hollow structure, the inner diameter of the main bearing plate is smaller than the outer diameter of the anchor plate 7, the anchor plate 7 is anchored on the top end surface (namely the end surface of the main bearing plate 2) of the anchor backing plate under the action of prestress, the outer diameter of the main bearing plate 2 is larger than the outer diameter of the horn tube 5 and the matched end thereof, a main bearing step is formed on the outer ring of the horn tube 5, the stress is transmitted to concrete, the outer diameter of the secondary bearing plate 3 is larger than the outer diameter of the horn tube 5 and the matched end thereof, and a secondary, transferring the stress to the concrete;

in the aspect of construction, the anchor backing plate has two structures in the construction process, firstly, as shown in figure 2, as the main bearing plate 2 is connected with the pouring template 8, the anchor backing plate externally arranged on the end face of the beam needs to be subjected to secondary vertical die pouring for anchor sealing after construction, the anchor backing plate is not attractive and is easy to generate shrinkage cracks, when a prefabricated assembly technology is used, the anchor protrudes out of the end face of the beam, the arrangement of reinforcing steel bars at joints and the connection of pore channels are not facilitated, the width of wet joints is increased, and the engineering cost is improved; secondly, as shown in fig. 3, in a mode of embedding the anchor plate 7 in the beam end by using the tensioning notch 81, the tensioning notch 81 needs to be additionally arranged before pouring, the sealing between the tensioning notch 81 and the pouring template 8 needs to be ensured so as to avoid influencing the penetration of slurry and influencing the subsequent tensioning, a larger notch size is usually reserved for ensuring that grouting holes are not interfered and the tensioning is facilitated, so that the whole structure is adversely influenced, and meanwhile, secondary formwork erection pouring is still needed for sealing the anchor after the pore channel grouting is finished, so that the flatness of the beam end is influenced;

in the aspect of structure, this type of anchor backing plate mainly transfers compressive stress to the concrete by main bearing plate 2 of top terminal surface, the flare tube 5 mainly plays the connection effect of transition to pre-buried pipe 51, generally consider the material utilization, can design the flare tube 5 thinner, and design the structural rigidity of main bearing plate 2 great, consequently receive the influence of the thickness and the initial stress position of flare tube 5, in case main bearing plate 2 produces plastic bending deformation, can stress concentration produce bigger splitting stress, and the less minor bearing plate 3 of loading end can't provide corresponding protection, so the mechanical properties of anchor backing plate main bearing plate 2 among the prior art has played the decisive role, and minor bearing plate 3 plays the effect less, be unfavorable for the dispersion effect of the whole stress of anchor backing plate, therefore be difficult to be applicable to the requirement of smaller and smaller anchor interval nowadays.

Aiming at the problems in the comparative example, the embodiment of the embedded tension-compression dispersion type anchor backing plate is provided, as shown in fig. 4 to 8, for anchoring a prestressed tendon in cooperation with an anchor plate 7, and comprises a web plate 1 with a hollow structure, wherein a main bearing plate 2 with a through hole is fixedly arranged at a first end of the web plate 1, the inner diameter of the main bearing plate 2 is smaller than that of the first end of the web plate 1 and is used for being matched with the anchor plate, and the outer diameter of the main bearing plate 2 is larger than that of the first end of the web plate 1; the second end of the web-pulling plate 1 is fixedly provided with a first secondary bearing plate 31 with a through hole, the inner diameter of the first secondary bearing plate 31 is larger than the outer diameter of the anchor plate, the outer diameter of the first secondary bearing plate 31 is larger than the outer diameter of the second end of the web-pulling plate 1, and the first secondary bearing plate 31 is also provided with a fixed joint 310;

specifically, the web-pulling plate 1, the main bearing plate 2 and the first secondary bearing plate 31 are prepared by adopting an integral casting forming process, the main bearing plate 2 and the first secondary bearing plate 31 are all distributed along the circumferential direction of the web-pulling plate 1, the web-pulling plate 1 is of a cylindrical structure, the axial length of an inner cavity 10 of the web-pulling plate 1 is greater than the axial length of the anchor plate 7, namely the anchor plate 7 can be embedded into the inner cavity 10 of the web-pulling plate 1, the inner edge of the main bearing plate 2 extends towards the inner part of the web-pulling plate 1 to form a step in clamping fit with the anchor plate 7, the main bearing plate 2 and the first secondary bearing plate 31 respectively form a main bearing step and a first secondary bearing step in concrete fit on the outer ring of the web-pulling plate 1, and the first secondary bearing plate 31 positioned at the top end of the anchor backing plate is provided with a fixed connection point 310 fixedly connected with the pouring template 8; in the process of stress: the main bearing plate 2 is stressed through the main bearing step, the elastic modulus of the concrete is smaller than that of the anchor backing plate casting, and the micro strain of the anchor backing plate is smaller than that of the concrete under the condition of the same stress, so that when the main bearing step bears the compressive stress to a certain degree, the first secondary bearing plate 31 can be influenced by the tensile stress of the web-pulling plate 1 to start sharing part of the compressive stress, and the purpose of dispersing the stress is achieved, and the anchor backing plate in the embodiment can fully utilize two bearing plates; secondly, the anchor plate 7 is embedded into the anchor backing plate, when the top end face of the anchor backing plate (namely the first secondary bearing plate 31) is connected with the pouring template 8, a tensioning notch does not need to be preset, after concrete pouring and tensioning are completed, the anchor sealing process can be completed only through pore grouting, additional formwork erection and anchor sealing are not needed, the construction efficiency is improved, and the engineering cost is saved; thirdly, the first secondary bearing plate 31 is positioned at the top end of the anchor backing plate, the outer diameter is larger than that of the main bearing plate 2, the bearing surface is also larger, and the stress can be better dispersed; and thirdly, compared with the anchor backing plate in the prior art, the stress diffusion is more uniform, and the inter-axial distance of the anchor can be reduced under the condition of applying the same prestress.

The anchor backing plate construction process of this embodiment uses horn pipe 5, pre-buried pipe 51 in the cooperation, and wherein, the one end and the main load bearing plate 2 of horn pipe 5 are connected, the other end with pre-buried pipe 51 way is connected for wrapping up prestressing tendons, construction method includes following step:

1) fixedly connecting the pouring template 8 with a fixed joint 310 on the first secondary bearing plate 31, namely fixedly connecting the pouring template 8 with the top end surface of the anchor backing plate, and fixedly connecting the horn tube 5 with the end surface of the main bearing plate 2 positioned outside the web pull plate 1; the pouring template 8 and the first secondary bearing plate 31, the horn tube 5 and the main bearing plate 2 can be effectively and mechanically connected through bolts or clamping grooves and the like;

2) pushing the pre-buried pore passage 51 into the horn tube 5 for connection and gap sealing; specifically, the sealing connection can be performed by winding a sealing adhesive tape or using a heat-shrinkable sleeve;

3) pouring concrete, namely pouring the concrete into the pouring template 8;

4) removing the formwork, maintaining, and then penetrating, pushing the anchor plate 7 into the inner cavity 10 of the web-pulling plate 1 after the prestressed tendons penetrate through the anchor plate 7, installing limiting and tensioning, wherein the limiting can be but not limited to a clip anchorage device, a conical anchorage device and other structures;

5) after tensioning is finished, cutting off redundant prestressed tendons, in a preferred embodiment, cutting off the part of the prestressed tendons exceeding the top end face of the web-pulling plate 1 after tensioning is finished, and carrying out a mud jacking process; the concrete grouting process can be performed by fixing the grouting plate 9 on the first secondary bearing plate 31, grouting through the grouting plate grouting hole 90 and the anchor plate grouting hole 70 on the anchor plate 7, and completing the anchor sealing process, wherein the anchor plate grouting hole 70 is communicated with the inner cavity 10 of the web 1 and the flare tube 5, as shown in fig. 6 (arranged along the radial direction of the anchor plate 7) and fig. 7 (arranged along the axial direction of the anchor plate 7).

In another embodiment, on the basis of the above embodiment, the outer ring of the web plate 1 is further fixedly provided with a reinforcing rib 4 along the axial direction thereof, and two ends of the reinforcing rib 4 are respectively fixedly connected with the main bearing plate 2 and the first secondary bearing plate 31; specifically, the reinforcing rib 4 and the anchor backing plate structure of the above embodiment are manufactured by an integral casting process, and the web pull plate 1 and the reinforcing rib 4 are pulled to drive the top end face of the anchor backing plate (i.e., the first secondary bearing plate 31) to disperse the compressive stress, thereby improving the dispersion performance of the compressive stress of the anchor backing plate.

In some other embodiments or practical applications, the axial length of the anchor plate 7 may also be greater than the axial length of the inner cavity 10 of the web-pulling plate 1, and the anchor sealing operation needs to be performed by a conventional means in the construction process; the specific shape of the web 1 can also be set according to specific working conditions, for example, it adopts the shapes of tower, flat, etc. described in the prior art; the connection relation of the integral casting molding process can be replaced by fixed connection modes such as bolts, welding and the like.

The above embodiment exemplarily shows a specific structure of the grouting process, and in other embodiments or practical applications, the anchor backing plate may be replaced by other structures, for example, as shown in fig. 9, the anchor backing plate further includes a grouting hole 30, the grouting hole 30 sequentially penetrates through an end surface of the first secondary bearing plate 31, a side wall of the web plate 1 and an inner wall of the main bearing plate 2, and grouting can be performed through a grouting hole located at an end surface of the first secondary bearing plate 31 through the grouting hole 30 during grouting without installing components such as the grouting plate 9.

The above embodiment exemplarily shows a specific structure of the anchor backing plate with the flared tube 5, and in other embodiments or practical applications, the anchor backing plate can be replaced by other structures, for example, as shown in fig. 10, the anchor backing plate in the above embodiment further includes a web pressing plate 6 with a hollow structure, one end of the web pressing plate 6 is fixedly connected with the main bearing plate 2, and an outer ring of the other end of the web pressing plate 6 is fixedly provided with a second secondary bearing plate 32 along the circumferential direction thereof and is provided with an interface connected with the embedded tube 51; specifically, the first secondary bearing plate 31, the web pull plate 1, the main bearing plate 2, the web pressure plate 6 and the second secondary bearing plate 32 are prepared by an integral casting forming process, the anchor backing plate of the embodiment adopts the anchor backing plate in the prior art to replace the horn tube 5 in the embodiment, the main bearing surface is arranged in the middle of the anchor backing plate, and the pressure stress is transmitted to the first secondary bearing plate 31 through the web pull plate 1 and is also transmitted to the second secondary bearing plate 32 through the web pressure plate 6, so that the pressure stress of each level of bearing plates of the anchor backing plate is uniformly dispersed; in addition, the web plate 1 can also be directly connected with the embedded pipe 51.

The invention provides an embedded type tension-compression dispersion type anchor backing plate and a construction method, wherein in the stress process, a main bearing plate 2 is stressed through a main bearing step, and because the elastic modulus of concrete is smaller than that of an anchor backing plate casting, under the condition of the same stress, the micro strain of the anchor backing plate is smaller than that of the concrete, when the main bearing step bears the compressive stress to a certain degree, a first secondary bearing plate 31 can be influenced by the tensile stress of a web plate 1 to start sharing part of the compressive stress, so that the purpose of dispersing the stress is achieved, and the anchor backing plate in the technical scheme can fully utilize two bearing plates; the anchor plate 7 can be embedded into the anchor backing plate (namely embedded into the inner cavity 10 of the web-pulling plate 1), when the top end face of the anchor backing plate (namely the first secondary bearing plate 31) is connected with the pouring template 8, a notch does not need to be preset, after concrete pouring and tensioning are completed, the anchor sealing process can be completed only through pore grouting, extra formwork erection for anchor sealing is not needed, the construction efficiency is improved, and the engineering cost is saved; compared with the anchor backing plate in the prior art, the stress diffusion is more uniform, and the inter-axial distance of the anchor can be reduced under the condition of applying the same prestress.

Claims (7)

1. The embedded type tension-compression dispersion type anchor backing plate is characterized by comprising a web pulling plate (1) with a hollow structure, wherein a main bearing plate (2) with a through hole is fixedly arranged at the first end of the web pulling plate (1), the inner diameter of the main bearing plate (2) is smaller than that of the first end of the web pulling plate (1), and the outer diameter of the main bearing plate (2) is larger than that of the first end of the web pulling plate (1);

the second end of the web-pulling plate (1) is fixedly provided with a first secondary bearing plate (31) with a through hole, the outer diameter of the first secondary bearing plate (31) is larger than that of the second end of the web-pulling plate (1), and the first secondary bearing plate (31) is further provided with a fixed joint (310).

2. An embedded tension and compression dispersion anchor pad according to claim 1, wherein the anchor pad is used for anchoring tendons in cooperation with the anchor plate (7), and the axial length of the web (1) is greater than that of the anchor plate (7).

3. The embedded tension-compression dispersion type anchor backing plate as claimed in claim 1, wherein the outer ring of the web plate (1) is fixedly provided with a reinforcing rib (4) along the axial direction thereof, and both ends of the reinforcing rib (4) are fixedly connected with the main bearing plate (2) and the first secondary bearing plate (31), respectively.

4. The embedded tension-compression dispersion type anchor backing plate as claimed in claim 1, further comprising a flare tube (5) fixedly connected to the main bearing plate (2).

5. The embedded tension-compression dispersion type anchor backing plate as claimed in claim 1, further comprising a web pressing plate (6) with a hollow structure, wherein one end of the web pressing plate (6) is fixedly connected with the main bearing plate (2), and the other end of the web pressing plate (6) is externally and annularly provided with a second secondary bearing plate (32).

6. The embedded tension-compression dispersion type anchor backing plate as claimed in claim 1, further comprising a grouting channel (30), wherein the grouting channel (30) sequentially penetrates through the end surface of the first secondary bearing plate (31), the side wall of the web plate (1) and the inner wall of the main bearing plate (2).

7. An anchor backing plate construction method, characterized by comprising the embedded tension-compression dispersion type anchor backing plate of claim 1, a horn tube (5) and an embedded duct (51), wherein the anchor backing plate is used for anchoring a prestressed tendon in cooperation with an anchor plate (7), and the construction method comprises the following construction steps:

1) fixedly connecting a pouring template (8) with a fixed joint (310) on a first secondary bearing plate (31), and fixedly connecting a horn tube (5) with the end face of a main bearing plate (2) positioned outside a web pulling plate (1);

2) pushing the pre-buried pore passage (51) into the horn tube (5) for connection and gap sealing;

3) pouring concrete;

4) removing the mould and completing maintenance, then penetrating, pushing the anchor plate (7) into the inner cavity (10) of the web-pulling plate (1) after the prestressed tendons penetrate through the anchor plate (7), installing, limiting and tensioning;

5) after tensioning is completed, cutting off redundant prestressed tendons, and carrying out a grouting process.

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