Prefabricated pile and preparation method, prefabricated composite pile and installation method

Abstract

The present invention provides a prefabricated pile and a preparation method, a prefabricated composite pile and an installation method, which belong to the field of construction engineering technology, and include: a steel cage, the steel cage includes a plurality of main bars and stirrups, and the two ends of the main bars are respectively a first end and a second end, and the two ends of the stirrups are respectively a starting end and a terminal end, wherein the second ends of the plurality of main bars extend along the length direction of the prefabricated pile to have a connection portion that exceeds the terminal end of the stirrup; concrete, covering the entire steel cage, the concrete corresponding to the position of the connection portion in the concrete is a concrete pile cap, and the concrete pile cap and the connection portion are detachably arranged, wherein a recess is arranged on the concrete pile cap near one end of the concrete pile body. By setting the recess, the present invention can quickly and safely remove the concrete pile cap from the prefabricated pile, and expose the main bars connected to the cap, without causing damage to the main bars.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and relates to a prefabricated pile, and in particular to a prefabricated pile and a preparation method, a prefabricated composite pile and an installation method. Background Art

[0002] Prefabricated pull-out piles are a type of pile foundation that is prefabricated in a factory and then transported to the construction site for installation. They are mainly used to resist uplift forces, that is, to prevent the structure from moving upward due to external forces. This type of pile is usually suitable for engineering scenarios that need to withstand large vertical upward tension, such as bridge anchoring, slope stabilization, offshore platforms, etc. Existing prefabricated piles have the following problems:

[0003] When there is a connection problem between the top of the precast pile and the pedestal, the top of the precast pile needs to be broken, that is, the top of the precast pile needs to be removed or reduced to expose the main reinforcement on the precast pile. However, due to the skills and quality of the construction workers, the main reinforcement will be damaged during the pile breaking operation, and the concrete on the precast pile will also cause cracks in the pile body due to the damage to the main reinforcement through the transfer of force, affecting the bearing capacity and service life of the entire precast pile. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide a prefabricated pile that can be reliably connected to a cap without damaging the structure of the product itself.

[0005] The object of the present invention can be achieved by the following technical solution: A prefabricated pile, comprising:

[0006] A steel cage, the steel cage comprising a plurality of main bars arranged in a ring array and extending along the length direction of the precast pile, and stirrups extending along the length direction of the precast pile and wound around the plurality of main bars, wherein the two ends of the plurality of main bars are respectively a first end and a second end, and the two ends of the stirrups are respectively a starting end and a terminal end, wherein the first ends of the plurality of main bars are arranged at the same end as the starting end of the stirrups, and the second ends of the plurality of main bars extend along the length direction of the precast pile to have a connection portion exceeding the terminal end of the stirrups;

[0007] Concrete, including a concrete pile body corresponding to the position of the stirrup and a concrete pile cap corresponding to the position of the connection part, and the concrete pile cap and the connection part are detachably arranged, wherein a recess is arranged on one end of the concrete pile cap close to the concrete pile body, and the recess is formed by being sunken along the outer surface of the concrete pile cap toward the inner surface, wherein the distance between the bottom of the recess and the surface of the main reinforcement is less than the depth of the recess on the concrete pile body.

[0008] In the above-mentioned precast pile, the recess is an annular groove, and the annular groove includes a first groove wall and a second groove wall, wherein the first groove wall is arranged obliquely, the second groove wall is arranged horizontally, and the first groove wall is formed by extending obliquely downward from the outer surface of the concrete pile cap to the inner surface, and the horizontal plane where the second groove wall is located is flush with the dividing line between the concrete pile body and the concrete pile cap.

[0009] In the above-mentioned precast pile, the groove depth of the annular groove reaches the outer surface of the main reinforcement.

[0010] In the above-mentioned precast pile, the surface of the connection part is covered with an isolation structure, wherein the isolation structure prevents the concrete pile cap from contacting the connection part.

[0011] In the above-mentioned prefabricated piles, the isolation structure is a membrane structure or a casing structure, wherein, when the isolation structure is a membrane structure, the outer surface of the main reinforcement corresponding to the connection part is covered with a membrane layer, and the width of the membrane layer is equal to the length of the connection part; when the isolation structure is a casing structure, the outer surface of the main reinforcement corresponding to the connection part is nested with a casing, and the depth of the casing is equal to the length of the connection part.

[0012] In the above-mentioned precast piles, the precast piles are solid.

[0013] In the above-mentioned precast pile, at least one plane is provided on the surface of the precast pile.

[0014] The present invention also provides a prefabricated composite pile, comprising:

[0015] The precast pile serves as a top pile, and the first end of the main reinforcement in the precast pile is connected to a first connecting end plate;

[0016] The prefabricated bottom pile is provided with a second connecting end plate at one end, and the connection between the prefabricated pile and the prefabricated bottom pile is achieved by fixed connection between the first connecting end plate and the second connecting end plate.

[0017] In the above-mentioned prefabricated composite piles, the prefabricated bottom piles are prefabricated hollow pipe piles, or prefabricated hollow bamboo-joint pipe piles.

[0018] The present invention also provides a method for preparing a prefabricated pile, comprising the steps of:

[0019] S1: positioning a plurality of main bars by a positioning mold, wherein the plurality of main bars are arranged in a ring shape, and a first connecting end plate is connected to one end of the main bar, the starting end of the stirrup starts from the end where the first connecting end plate is located, and is spirally wound around the main bar along the axis direction of the main bar, and a height difference is formed between the terminal end of the stirrup and the other end of the main bar, thereby forming a steel cage;

[0020] S2: In the steel cage of step S1, the outer surface of the main reinforcement corresponding to the height difference is covered with a layer of isolation structure;

[0021] S3: placing the steel cage in step S2 into a precast mold for the precast pile, wherein a convex portion is provided in the precast mold. When concrete is poured into the precast mold, the precast pile is solidly formed and a concave portion is formed on the surface of the precast pile, thereby completing the preparation of the precast pile.

[0022] The present invention also provides a method for installing a prefabricated composite pile, comprising the steps of:

[0023] S1: Insert the prefabricated bottom pile into the corresponding soil and reserve the connection height;

[0024] S2: moving the precast pile to above the precast bottom pile, and forming a precast composite pile by connecting the first connecting end plate on the precast pile and the second connecting end plate on the precast bottom pile;

[0025] S3: Pressing down the prefabricated composite pile so that the second groove wall 312 in the annular groove on the prefabricated pile is flush with the ground. At this time, the position of the second groove wall is the elevation position of the top of the prefabricated composite pile;

[0026] S4: Remove the concrete pile cap on the precast pile to expose the second end of the main reinforcement in the precast pile, and this end serves as the connection end with the cap. At this time, the installation of the precast composite pile is completed.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The precast pile provided by the present invention can quickly and safely remove the concrete pile cap from the precast pile by providing a recess, thereby exposing the main reinforcement connected to the cap without damaging the main reinforcement. In addition, during the transportation and stacking process of the precast pile with the concrete pile cap, the main reinforcement is protected from being exposed and corroded, thereby extending the service life of the precast pile.

[0029] (2) The concave portion is set as an annular groove, and the groove depth of the annular groove is opened to the outer surface of the main reinforcement. In this way, when the concrete pile cap is removed, the concrete pile body will not be affected, thereby avoiding cracking of the concrete pile body.

[0030] (3) By setting up an isolation structure, the concrete pile cap and the main reinforcement are not in contact, so that a similar "nested structure" is formed between the concrete pile cap and the main reinforcement. The concrete pile cap can be removed from the main reinforcement with just a little force. The operation is convenient and quick, and will not cause damage to the main reinforcement.

[0031] (4) The precast piles are solid in design, which not only eliminates the need for core filling operations but also enables reliable connection with the foundation. The solid structure not only improves the shear resistance of the entire precast pile and prolongs its service life, but also eliminates the need for a sealing structure, thus simplifying the installation of the precast piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a prefabricated pile of the present invention.

[0033] Figure 2 It is a cross-sectional view of a prefabricated pile of the present invention.

[0034] Figure 3 It is a cross-sectional view of a precast pile of the present invention in a state where the isolation structure on the second end of the main reinforcement is not removed.

[0035] Figure 4 It is a cross-sectional view of a precast pile of the present invention with the isolation structure on the second end of the main reinforcement removed.

[0036] Figure 5 It is a cross-sectional view of the middle section of a prefabricated pile of the present invention.

[0037] Figure 6 It is a cross-sectional view of a precast pile in which a first connecting end plate is connected to the first end of a main reinforcement.

[0038] Figure 7 It is a structural schematic diagram of a prefabricated pile connected to a cap according to the present invention.

[0039] Figure 8 The utility model is a flow chart of installation of a prefabricated composite pile of the present invention.

[0040] In the figure,

[0041] 100, steel cage; 110, main reinforcement; 111, first end; 112, second end; 120, stirrups; 121, starting end; 122, ending end;

[0042] 200, concrete pile body;

[0043] 300, concrete pile cap; 310, annular groove; 311, first groove wall; 312, second groove wall;

[0044] 400, isolation structure;

[0045] 500, first connecting end plate;

[0046] 600, prefabricated bottom pile; 610, second connecting end plate;

[0047] 700. Platform. DETAILED DESCRIPTION

[0048] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0049] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] like Figures 1 to 8 As shown, the present invention provides a prefabricated pile, comprising:

[0051] A steel cage 100, comprising a plurality of main bars 110 arranged in a ring array and extending along the length direction of the precast pile, and stirrups 120 extending along the length direction of the precast pile and wound around the plurality of main bars 110, wherein two ends of the plurality of main bars 110 are respectively a first end 111 and a second end 112, and two ends of the stirrups 120 are respectively a starting end 121 and a terminating end 122, wherein the first end 111 of the plurality of main bars 110 is arranged at the same end as the starting end 121 of the stirrups 120, and the second end 112 of the plurality of main bars 110 extends along the length direction of the precast pile to have a connection portion exceeding the terminating end 122 of the stirrups 120;

[0052] Concrete, including a concrete pile body 200 corresponding to the position of the stirrup 120 and a concrete pile cap 300 corresponding to the position of the connection part, and the concrete pile cap 300 and the connection part are detachably arranged, wherein a recess is arranged on one end of the concrete pile cap 300 close to the concrete pile body 200, and the recess is formed by being sunken along the outer surface of the concrete pile cap 300 toward the inner surface, wherein the distance between the bottom of the recess and the surface of the main reinforcement 110 is less than the depth of the recess on the concrete pile body 200.

[0053] A precast pile provided by the present invention can quickly and safely remove a concrete pile cap 300 from the precast pile by providing a recess, thereby exposing the main reinforcement 110 connected to the base 700 without causing damage to the main reinforcement 110. In addition, during the transportation and stacking of the precast pile with the concrete pile cap 300, the main reinforcement 110 is protected from being exposed and corroded, thereby extending the service life of the precast pile.

[0054] In addition, although the concrete in this embodiment is divided into a concrete pile body 200 and a concrete pile cap 300 by the concave portion, the concrete pile body 200 and the concrete pile cap 300 are integrally formed when the precast pile is formed, and do not need to be formed in separate steps, which can be well adapted to existing precast pile forming equipment and avoid increasing the forming cost of the precast pile.

[0055] Preferably, the recess is an annular groove 310, and the annular groove 310 includes a first groove wall 311 and a second groove wall 312, wherein the first groove wall 311 is arranged obliquely, and the second groove wall 312 is arranged horizontally, and the first groove wall 311 is formed by extending obliquely downward from the outer surface to the inner surface of the concrete pile cap 300, and the horizontal plane where the second groove wall 312 is located is flush with the boundary line between the concrete pile body 200 and the concrete pile cap 300.

[0056] It is further pointed out that the groove depth of the annular groove 310 reaches the outer surface of the main rib 110 .

[0057] In this embodiment, the recess is set as an annular groove 310, and the groove depth of the annular groove 310 is opened to the outer surface of the main reinforcement 110, so that when the concrete pile cap 300 is removed, the concrete pile body 200 will not be affected, thereby preventing the concrete pile body 200 from cracking.

[0058] It is worth mentioning that the groove width is the same as the groove depth, which is generally about 40mm.

[0059] In addition, only a thin layer of concrete may be retained between the bottom of the groove and the main reinforcement 110 , which also facilitates the removal of the concrete pile cap 300 without causing damage to the main reinforcement 110 .

[0060] Preferably, the surface of the connection part is covered with an isolation structure 400 , wherein the isolation structure 400 prevents the concrete pile cap 300 from contacting the connection part.

[0061] It is further pointed out that the isolation structure 400 is a thin film structure or a sleeve structure, wherein, when the isolation structure 400 is a thin film structure, the outer surface of the main rib 110 corresponding to the connection part is covered with a thin film layer, and the width of the thin film layer is equal to the length of the connection part; when the isolation structure 400 is a sleeve structure, a sleeve is nested on the outer surface of the main rib 110 corresponding to the connection part, and the depth of the sleeve is equal to the length of the connection part.

[0062] It is worth mentioning that the isolation structure 400 can be an isolation tarpaulin, or a PVC film, or a plastic paper, or a PVC sleeve, etc.

[0063] In this embodiment, by providing the isolation structure 400, the concrete pile cap 300 and the main reinforcement 110 are not in contact with each other, so that a similar "nested structure" is formed between the concrete pile cap 300 and the main reinforcement 110. The concrete pile cap 300 can be removed from the main reinforcement 110 with just a little force, which is convenient and quick to operate and will not cause damage to the main reinforcement 110.

[0064] Preferably, the prefabricated piles are solid.

[0065] It is further pointed out that the precast pile is a non-prestressed solid pile.

[0066] In the prior art, precast piles are generally hollow, and hollow precast piles generally have the following problems. First, when the precast pile is connected to the base 700, it is necessary to set a steel cage 100 in the hollow position of the precast pile and fill the steel cage 100 by grouting to form a whole with the external precast pile. This operation process is called "core filling process". The structure formed by the "core filling process" is connected to the base 700, and the operation is relatively troublesome; second, the precast pile with a hollow setting is inserted into the soil, and is affected by the lateral or oblique shear stress of the soil for a long time, and is prone to breakage or cracking, which affects its service life; third, when the precast pile with a hollow setting is inserted into the soil, cement slurry will emerge from the hollow position of the precast pile. Therefore, in order to avoid the above situation, it is necessary to seal the hollow part.

[0067] In view of the various problems existing in the hollow precast piles in the prior art, the precast piles in this embodiment are solidly arranged, which not only eliminates the need for core filling operations but also enables reliable connection with the base 700. Moreover, the setting of the solid structure not only improves the shear resistance of the entire precast pile and extends the service life of the precast pile, but also eliminates the need for a sealing structure, thereby simplifying the installation of the precast piles.

[0068] It is worth mentioning that, since the precast piles are solid, they are generally formed by horizontal casting. In order to facilitate the compaction, feeding and finishing of concrete, the surface of the precast piles after forming will have at least one plane.

[0069] It is further pointed out that the cross section of the precast pile is a regular hexagon, or a regular octagon, or a regular decagon, or a drum shape, or a pear shape, etc.

[0070] Preferably, the present invention further provides a prefabricated composite pile, comprising:

[0071] The precast pile, wherein the first end 111 of the main reinforcement 110 in the precast pile is connected to a first connecting end plate 500;

[0072] The prefabricated bottom pile 600 is provided with a second connection end plate 610 at one end, and the connection between the prefabricated pile and the prefabricated bottom pile 600 is achieved by the fixed connection between the first connection end plate 500 and the second connection end plate 610 .

[0073] In this embodiment, the prefabricated pile is solid, and the prefabricated bottom pile 600 is hollow pipe pile, or hollow bamboo pipe pile, and the prefabricated combined pile thus formed also has the same performance as the prefabricated pile. In addition, the molding of the prefabricated bottom pile 600 is an existing preparation process, so it will not be described in detail.

[0074] It is further pointed out that when the precast pile is used as a part of a precast composite pile, the length of the precast pile is generally not less than 6 meters, so that it can have a stronger anti-horizontal performance.

[0075] It is worth mentioning that the first connection end plate 500 and the second connection end plate 610 can be directly welded and fixed, or a positioning convex portion is provided on the first connection end plate 500, and a positioning concave portion is provided on the second connection end plate 610, and the positioning convex portion and the positioning concave portion are matched and then fixed by welding, or the first connection end plate 500 and the second connection end plate 610 are both provided with positioning concave portions, and then the first connection end plate 500 and the second connection end plate 610 are positioned and connected by a third accessory (positioning convex portion), and then fixed by welding. All of the above methods are possible, and are not limited to the several methods described above.

[0076] The present invention also provides a method for preparing a prefabricated pile, comprising the steps of:

[0077] S1: A plurality of main bars 110 are positioned by a positioning mold, and the plurality of main bars 110 are arranged in a ring shape, and a first connecting end plate 500 is connected to one end of the main bar 110, and a starting end 121 of the stirrup 120 starts from the end where the first connecting end plate 500 is located, and is spirally wound around the main bar 110 along the axial direction of the main bar 110, and a height difference is formed between the terminating end 122 of the stirrup 120 and the other end of the main bar 110, so as to form a steel cage 100;

[0078] S2: In the steel cage 100 of step S1, the outer surface of the main reinforcement 110 corresponding to the height difference is covered with a layer of isolation structure 400;

[0079] S3: Put the steel cage 100 in step S2 into a precast mold of a precast pile, and a convex portion is provided in the precast mold. When concrete is poured into the precast mold, the precast pile is solidly arranged and a concave portion is formed on the surface of the precast pile, thereby completing the preparation of the precast pile.

[0080] It is worth mentioning that if a prefabricated composite pile needs to be prepared, it is only necessary to weld and fix the second connection end plate 610 on the prefabricated bottom pile 600 to the first connection end plate 500 .

[0081] The present invention also provides an installation process of a prefabricated composite pile, comprising the steps of:

[0082] S1: insert the prefabricated bottom pile 600 into the corresponding soil and reserve the connection height;

[0083] S2: moving the prefabricated pile as the top pile to the top of the prefabricated bottom pile 600, and forming a prefabricated composite pile by connecting the first connecting end plate 500 on the prefabricated pile and the second connecting end plate 610 on the prefabricated bottom pile 600;

[0084] S3: Pressing down the prefabricated composite pile so that the second groove wall 312 in the annular groove 310 on the prefabricated pile reaches a preset position;

[0085] S4: removing the concrete pile cap 300 on the precast pile, exposing the connection part of the main reinforcement 110 in the precast pile, and connecting the cap reinforcement to the connection part.

[0086] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0087] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0088] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A prefabricated pile, characterized in that: include: A steel cage, the steel cage comprising a plurality of main bars arranged in a ring array and extending along the length direction of the precast pile, and stirrups extending along the length direction of the precast pile and wound around the plurality of main bars, wherein the two ends of the plurality of main bars are respectively a first end and a second end, and the two ends of the stirrups are respectively a starting end and a terminal end, wherein the first ends of the plurality of main bars are arranged at the same end as the starting end of the stirrups, and the second ends of the plurality of main bars extend along the length direction of the precast pile to have a connection portion exceeding the terminal end of the stirrups; Concrete, including a concrete pile body corresponding to the position of the stirrup and a concrete pile cap corresponding to the position of the connection part, and the concrete pile cap and the connection part are detachably arranged, wherein a recess is arranged on one end of the concrete pile cap close to the concrete pile body, and the recess is formed by being sunken along the outer surface of the concrete pile cap toward the inner surface, wherein the distance between the bottom of the recess and the surface of the main reinforcement is less than the depth of the recess on the concrete pile body.

2. The prefabricated pile according to claim 1, characterized in that: The recess is an annular groove, and the annular groove includes a first groove wall and a second groove wall, wherein the first groove wall is arranged obliquely, and the second groove wall is arranged horizontally, and the first groove wall is formed by extending obliquely downward from the outer surface of the concrete pile cap to the inner surface, and the horizontal plane where the second groove wall is located is flush with the dividing line between the concrete pile body and the concrete pile cap.

3. The prefabricated pile according to claim 2, characterized in that: The groove depth of the annular groove reaches the outer surface of the main rib.

4. The prefabricated pile according to claim 1, characterized in that: The surface of the connection part is covered with an isolation structure, wherein the isolation structure prevents the concrete pile cap from contacting the connection part.

5. The prefabricated pile according to claim 4, characterized in that: The isolation structure is a film structure or a sleeve structure, wherein, when the isolation structure is a film structure, the outer surface of the main rib corresponding to the connection part is covered with a film layer, and the width of the film layer is equal to the length of the connection part; when the isolation structure is a sleeve structure, a sleeve is nested on the outer surface of the main rib corresponding to the connection part, and the depth of the sleeve is equal to the length of the connection part.

6. The prefabricated pile according to claim 1, characterized in that: The prefabricated piles are arranged in a solid manner.

7. A prefabricated composite pile having the prefabricated pile according to any one of claims 1 to 6, characterized in that: include: The precast pile serves as a top pile, and the first end of the main reinforcement in the precast pile is connected to a first connecting end plate; The prefabricated bottom pile is provided with a second connecting end plate at one end, and the connection between the prefabricated pile and the prefabricated bottom pile is achieved by fixed connection between the first connecting end plate and the second connecting end plate.

8. The prefabricated composite pile according to claim 7, characterized in that: The prefabricated bottom piles are prefabricated hollow pipe piles, or prefabricated hollow bamboo-joint pipe piles.

9. A method for preparing a prefabricated pile according to any one of claims 1 to 6, characterized in that: Includes steps: S1: positioning a plurality of main bars by a positioning mold, wherein the plurality of main bars are arranged in a ring shape, and a first connecting end plate is connected to one end of the main bar, the starting end of the stirrup starts from the end where the first connecting end plate is located, and is spirally wound around the main bar along the axis direction of the main bar, and a height difference is formed between the terminal end of the stirrup and the other end of the main bar, thereby forming a steel cage; S2: In the steel cage of step S1, the outer surface of the main reinforcement corresponding to the height difference is covered with a layer of isolation structure; S3: placing the steel cage in step S2 into a precast mold for the precast pile, wherein a convex portion is provided in the precast mold. When concrete is poured into the precast mold, the precast pile is solidly formed and a concave portion is formed on the surface of the precast pile, thereby completing the preparation of the precast pile.

10. A method for installing the prefabricated composite pile according to claim 7, characterized in that: Includes steps: S1: Insert the prefabricated bottom pile into the corresponding soil and reserve the connection height; S2: moving the precast pile as a top pile to the top of the precast bottom pile, and forming a precast composite pile by connecting the first connecting end plate on the precast pile and the second connecting end plate on the precast bottom pile; S3: Pressing down the prefabricated composite pile so that the second groove wall in the annular groove on the prefabricated pile reaches a preset position; S4: Remove the concrete pile cap on the precast pile to expose the connection part of the main reinforcement in the precast pile, and connect the cap reinforcement to the connection part.

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