Fabricated crown beam matched with steel pipe pile and construction method of fabricated crown beam

Abstract

The invention provides an assembly type crown beam matched with a steel pipe pile, which comprises a bottom connecting part, the bottom connecting part comprises a fixing plate and a lap joint device which is arranged on the lower side of the fixing plate and used for being connected with a steel pipe, an outer side baffle is detachably mounted on one side of the fixing plate, and an inner side baffle is detachably mounted on the other side of the fixing plate; a middle truss is arranged between the inner side baffle and the outer side baffle, and the inner side baffle is detachably connected with the steel support. The outer side baffle is L-shaped, the short edge of the outer side baffle is detachably connected with the fixing plate, and the long edge is detachably connected with the middle truss; the inner side baffle is L-shaped, the short edge of the inner side baffle is detachably connected with the fixed plate, and the long edge is detachably connected with the middle truss; the lap joint device comprises an L-shaped lap joint block, one side of the lap joint block is connected with the steel pipe pile, and the other side is connected with the fixing plate. The fabricated crown beam matched with the steel pipe pile is simple in overall structure, reasonable in stress, safe, reliable, convenient to mount and dismount and capable of being recycled and reused, and the construction cost is greatly saved.

Description

Technical Field

[0001] The invention belongs to the technical field of deep foundation pit construction, and in particular relates to an assembled crown beam adapted to steel pipe piles and a construction method thereof. Background Art

[0002] With the continuous development of the construction scale of high-rise buildings, bridges and underground structures, foundation pit excavation has become an indispensable part of construction. In the process of foundation pit excavation, the selection of support structure is an important factor restricting the construction period and construction quality. When steel pipe piles are used as support structures, they have developed rapidly in deep foundation pit engineering applications in recent years due to their high rigidity, small deformation, fast construction speed, low pollution, few underground residues, and ability to be reused. In order to meet the integrity and force requirements of steel pipe piles, a crown beam must be set on the top of the steel pipe piles. The commonly used crown beam is a reinforced concrete crown beam that is welded by steel pipe piles and steel bars and poured with concrete, but the construction period is long, and the ends of the steel pipe piles need to be cut and the crown beams need to be chiseled off in the later stage, making it impossible to recycle the materials. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes an assembled crown beam adapted to steel pipe piles and a construction method thereof.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] An assembled crown beam adapted for steel pipe piles comprises a bottom connection part, the bottom connection part comprises a fixed plate and a lap joint device on the lower side of the fixed plate for connecting with the steel pipe, an outer baffle plate is detachably installed on one side of the fixed plate, an inner baffle plate is detachably installed on the other side, a middle truss is provided between the inner baffle plate and the outer baffle plate, and the inner baffle plate is detachably connected to the steel support; the outer baffle plate is L-shaped, and its short side is detachably connected to the fixed plate, and its long side is detachably connected to the middle truss; the inner baffle plate is L-shaped, and its short side is detachably connected to the fixed plate, and its long side is detachably connected to the middle truss; the lap joint device comprises an L-shaped lap joint block, one side of which is connected to the steel pipe pile, and the other side is connected to the fixed plate.

[0006] Furthermore, the wall thickness of the outer baffle plate and the inner baffle plate is greater than 16 mm.

[0007] Furthermore, the outer edges of the short sides of the outer baffle plate and the inner baffle plate do not extend beyond the edge of the fixed plate.

[0008] Furthermore, the middle truss includes Bailey plates arranged corresponding to the outer baffles and the inner baffles respectively, and a support frame is provided between the Bailey plates arranged corresponding to the outer baffles and the Bailey plates arranged corresponding to the inner baffles.

[0009] Furthermore, stiffening ribs are provided between the long side and the short side of the outer baffle.

[0010] Furthermore, the inner baffle and the steel support are connected by bolts.

[0011] Furthermore, one side of the lap joint device is connected to the steel pipe pile by bolts, and the other side is connected to the fixing plate by bolts.

[0012] Furthermore, the short sides of the outer baffle plate and the inner baffle plate are connected to the fixing plate by bolts.

[0013] A construction method for the above-mentioned assembled crown beam comprises the following steps:

[0014] S1, prefabricated inner baffle, outer baffle, fixing plate, L-shaped overlap block and middle truss;

[0015] S2, placing the fixing plate on the top of the steel pipe pile and fixing it to the steel pipe pile through an L-shaped overlap block;

[0016] S3. Install the outer baffle on the fixed plate;

[0017] S4. Locate the middle truss by the angle steel on the outer baffle plate and install the middle truss;

[0018] S5. Install the inner baffle on the fixed plate;

[0019] S6. Install steel supports on the inner baffle.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The assembled crown beam adapted to the steel pipe piles provided by the invention has a simple overall structure, reasonable force, safety and reliability, and is easy to install and dismantle. Compared with the traditional reinforced concrete crown beam, it avoids the later processes of cutting the steel pipe piles and chiseling the crown beam, greatly shortens the construction period, and can be recycled and reused, greatly saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 A side view created for the present invention;

[0024] Figure 2 Front view created for the present invention;

[0025] Figure 3 A top view created for the present invention;

[0026] Figure 4A schematic diagram of the outer baffles in the present invention;

[0027] Figure 5 A schematic diagram of the inner baffle in the invention;

[0028] Figure 6 A schematic diagram of an L-shaped overlap block in the invention;

[0029] Figure 7 It is a schematic diagram of the L-shaped overlap block and the steel pipe pile being filled by the wedge-shaped block in the invention;

[0030] Figure 8 A schematic diagram of a support frame in the invention;

[0031] Fig. 9 It is a schematic diagram of Bailey sheet in the invention. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] An assembled crown beam adapted for steel pipe piles, such as Figures 1 to 9 As shown, it includes a bottom connection part, which includes a fixing plate 6 and a lap joint device 501 on the lower side of the fixing plate for connecting with the steel pipe, and its main function is to connect the steel pipe pile with the upper crown beam structure. An outer baffle 1 is detachably installed on one side of the fixing plate, and an inner baffle 2 is detachably installed on the other side. A middle truss is provided between the inner baffle and the outer baffle, and the inner baffle is detachably connected to the steel support;

[0037] The outer baffle is L-shaped, with its short side detachably connected to the fixed plate and its long side detachably connected to the middle truss; the inner baffle is an L-shaped body 101, with its short side detachably connected to the fixed plate and its long side detachably connected to the middle truss; the overlapping device includes an L-shaped overlapping block 5, one side of which is connected to the steel pipe pile and the other side is connected to the fixed plate.

[0038] In an optional embodiment, the long side of the outer baffle plate facing the middle truss side and the long side of the inner baffle plate facing the middle truss side are both provided with a plurality of angle steels 103. The two side baffle plates are welded with angle steels according to the height of the middle truss, and the middle truss structure is fixed by each angle steel at the same time, so that the structural stability is guaranteed. Usually, one row of trusses is equipped with two rows of angle steels, and the angle steel model should not be less than L50×5mm. The wall thickness of the outer baffle plate and the inner baffle plate is greater than 16mm.

[0039] The outer edges of the short sides of the outer baffle and the inner baffle do not extend outward from the edge of the fixed plate. The middle truss includes Bailey plates 3 arranged corresponding to the outer baffle and the inner baffle respectively, and a support frame 4 is provided between the Bailey plates arranged corresponding to the outer baffle and the Bailey plates arranged corresponding to the inner baffle. Usually, the number of Bailey plates is not less than 2 rows.

[0040] The outer baffle is provided with stiffening ribs 102 between the long side and the short side to ensure the stress stability to a greater extent, while the inner baffle is not provided with stiffening ribs and is used to connect the steel support. Usually, after the angle steel on the outer baffle is welded, the bolt holes are arranged according to the assumed point position of the steel support and the design plan, and the bolt diameter should not be less than 20mm.

[0041] The inner baffle is connected to the steel support by bolts. The overlapping device includes an L-shaped steel plate, one side of which is connected to the steel pipe pile by bolts, and the other side is connected to the fixed plate by bolts. The short sides of the outer baffle and the inner baffle are connected to the fixed plate by bolts 7. The overlapping device is provided with a triangular rib 502 to improve its structural strength.

[0042] The above-mentioned prefabricated crown beam is easy and convenient to construct, and the construction period is short. At the same time, the mechanical properties such as strength and stiffness are stronger. It is suitable for the foundation pit excavation process where the supporting structure is any type of steel pipe piles, and can be reused after disassembly.

[0043] A construction method for the above-mentioned assembled crown beam comprises the following steps:

[0044] S1. Prefabricate inner baffles, outer baffles, fixed plates, L-shaped overlap blocks, middle trusses and other components to facilitate later assembly and reuse;

[0045] S2, place the fixing plate on the top of the steel pipe pile and fix it to the steel pipe pile through the L-shaped overlap block. Preferably, the gap between the L-shaped overlap block and the steel pipe pile is filled with a wedge block 8, such as Figure 7 As shown, the main function of the wedge block is to fill the gap between the L-shaped ribbed connecting block and the steel pipe pile, making the bolt connection more firm and reliable.

[0046] S3. Install the outer baffle on the fixed plate;

[0047] S4. Locate the middle truss by the angle steel on the outer baffle plate and install the middle truss;

[0048] S5. Install the inner baffle on the fixed plate;

[0049] S6. The overall assembly of the crown beam has been completed through the above steps. Subsequently, the position and layout of the steel support are located according to the design plan, and the steel support is installed on the inner baffle by bolts.

[0050] The main body of the assembled crown beam adapted to the steel pipe piles provided by the invention is composed of a steel structure, including inner and outer baffles, a middle truss and a lap joint. The inner and outer baffles are both L-shaped, and their main function is to fix the middle truss structure. At the same time, the inner baffle plays the role of connecting the steel support. The middle truss structure is composed of standard Bailey plates and support frames, and has strong bending, compression and shearing capabilities. The lap joint is mainly used to connect the steel pipe piles in the foundation pit. The main structures are all bolted and can be easily disassembled for reuse.

[0051] In summary, the assembled crown beam adapted to the steel pipe pile provided by the invention has a simple overall structure, reasonable force, safety and reliability, and is easy to install and dismantle; compared with the traditional reinforced concrete crown beam, it avoids the later steel pipe pile cutting and crown beam chiseling processes, greatly shortens the construction period, and can be recycled and reused, greatly saving construction costs. It has great promotion value and good social benefits, and provides a reference for the excavation of foundation pits for steel pipe pile support structures.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled crown beam adapted to a steel pipe pile, characterized in that: It includes a bottom connecting part, which includes a fixed plate and a lap joint device on the lower side of the fixed plate for connecting with a steel pipe. An outer baffle plate is detachably installed on one side of the fixed plate, and an inner baffle plate is detachably installed on the other side. A middle truss is provided between the inner baffle plate and the outer baffle plate, and the inner baffle plate is detachably connected to the steel support; the outer baffle plate is L-shaped, and its short side is detachably connected to the fixed plate, and its long side is detachably connected to the middle truss; the inner baffle plate is L-shaped, and its short side is detachably connected to the fixed plate, and its long side is detachably connected to the middle truss; the lap joint device includes an L-shaped lap block, one side of which is connected to the steel pipe pile, and the other side is connected to the fixed plate.

2. The assembled crown beam adapted for steel pipe piles according to claim 1 is characterized in that: The wall thickness of the outer baffle plate and the inner baffle plate is greater than 16 mm.

3. The assembled crown beam adapted for steel pipe piles according to claim 1 is characterized in that: The outer edges of the short sides of the outer baffle plate and the inner baffle plate do not extend beyond the edge of the fixed plate.

4. The assembled crown beam adapted for steel pipe piles according to claim 1 is characterized in that: The middle truss includes Bailey plates arranged corresponding to the outer baffles and the inner baffles respectively, and a support frame is provided between the Bailey plates arranged corresponding to the outer baffles and the Bailey plates arranged corresponding to the inner baffles.

5. The assembled crown beam adapted for steel pipe piles according to claim 1 is characterized in that: Stiffening ribs are provided between the long side and the short side of the outer baffle.

6. The assembled crown beam adapted to the steel pipe pile and the construction method thereof according to claim 1, characterized in that: The inner baffle plate is connected to the steel support via bolts.

7. The assembled crown beam adapted to the steel pipe pile and the construction method thereof according to claim 1 is characterized in that: One side of the lap joint device is connected to the steel pipe pile by bolts, and the other side is connected to the fixing plate by bolts.

8. The assembled crown beam adapted to the steel pipe pile and the construction method thereof according to claim 1 is characterized in that: The short sides of the outer baffle plate and the inner baffle plate are both connected to the fixing plate by bolts.

9. A construction method for the assembled crown beam according to any one of claims 1 to 8, characterized in that: The steps include: S1, prefabricated inner baffle, outer baffle, fixing plate, L-shaped overlap block and middle truss; S2, placing the fixing plate on the top of the steel pipe pile and fixing it to the steel pipe pile through an L-shaped overlap block; S3. Install the outer baffle on the fixed plate; S4. Locate the middle truss by the angle steel on the outer baffle plate and install the middle truss; S5. Install the inner baffle on the fixed plate; S6. Install steel supports on the inner baffle.

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