A trench support tool and trench excavation support method

Abstract

The application provides a trench support tool and trench excavation support method, and relates to the technical field of building construction. The trench support tool comprises a first steel plate, a second steel plate, a first H-shaped steel stand, a second H-shaped steel stand and a reinforcing steel plate. The first steel plate and the second steel plate are symmetrically arranged and have the same structure. Two first H-shaped steel stands are arranged on the first steel plate at intervals. Two second H-shaped steel stands are arranged on the second steel plate at intervals. A plurality of reinforcing steel plates are arranged at intervals between the two first H-shaped steel stands and between the two second H-shaped steel stands. The trench support tool further comprises a distance adjusting assembly. The distance adjusting assembly comprises a first steel pipe, a second steel pipe and a limiting piece. The first steel pipe and the second steel pipe are coaxially arranged and are used for mutual sleeving. The limiting piece is detachably connected to the first steel pipe and the second steel pipe. Compared with the prior art, the trench support tool can effectively protect the personnel working in the trench and avoid safety hazards.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and more specifically, to a trench support tooling and a trench excavation and support method. Background Technology

[0002] With the continuous advancement of urbanization, the construction of municipal, road, and building projects is gradually increasing. Among these projects, trench excavation is a frequently required task. However, trench excavation also carries certain risks, so it is essential to strengthen protective measures to ensure the personal safety of workers and the quality of the project.

[0003] Existing trench support structures mainly employ natural slope, soil nailing reinforcement, and straight trenches such as channel steel or sheet piles and reinforced concrete piles. These support structures generally suffer from problems such as high cost, long construction time, easy soil collapse after pile extraction, and inability to adapt to trenches of different widths. Summary of the Invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems.

[0005] This invention provides a trench support fixture, comprising: a first steel plate, a second steel plate, a first H-shaped steel column, a second H-shaped steel column, and a reinforcing steel plate. The first steel plate and the second steel plate have the same structure and are symmetrically arranged. Two first H-shaped steel columns are spaced apart on the first steel plate, and two second H-shaped steel columns are spaced apart on the second steel plate. Multiple reinforcing steel plates are spaced apart between the two first H-shaped steel columns and between the two second H-shaped steel columns. The trench support fixture further includes a distance adjustment component for adjusting the first steel plate and the second steel plate to move closer or further apart. The distance adjustment component includes a first steel pipe, a second steel pipe, and a limiting member. The first steel pipe is connected to the first H-shaped steel column, and the second steel pipe is connected to the second H-shaped steel column. The first steel pipe and the second steel pipe are coaxially arranged and used for interlocking. The limiting member is detachably connected to the first steel pipe and the second steel pipe, and the limiting member is used to restrict the relative movement of the first steel pipe and the second steel pipe.

[0006] The trench support tooling provided by this invention has, but is not limited to, the following beneficial effects compared to the prior art:

[0007] The trench support fixture described in this invention can be hoisted into the trench using a crane or other lifting machinery. Then, a distance adjustment component is used to attach the first and second steel plates to the two sidewalls of the trench. A limiting member can then be connected to the first and second steel pipes to restrict their relative movement. By incorporating the distance adjustment component, the distance between the first and second steel plates can be adjusted according to the trench width, allowing the same fixture to be used with trenches of different widths, thus broadening its applicability. Furthermore, multiple reinforcing steel plates are spaced between the two first H-shaped steel columns and between the two second H-shaped steel columns, ensuring that the fixture's strength, stiffness, and stability under ultimate load conditions meet the requirements of the "Technical Specification for Foundation Pit Support" and the "Code for Design of Steel Structures," thus preventing safety hazards for workers operating in the trench.

[0008] Optionally, the first steel pipe is provided with a plurality of first connecting parts at intervals along its length, and the second steel pipe is provided with a plurality of second connecting parts at intervals along its length, wherein the first connecting parts and the second connecting parts are used to connect through the limiting member.

[0009] Optionally, the limiting member is a pin, the first connecting part is a first through hole, the second connecting part is a second through hole, and the first through hole and the second through hole are used to connect through the pin to fix the first steel pipe relative to the second steel pipe.

[0010] Optionally, two first H-shaped steel columns are respectively disposed on the two side walls of the first steel plate. The first H-shaped steel column includes a first wing plate, a second wing plate, and a first web plate connected between the first wing plate and the second wing plate. The first wing plate is connected to the first steel plate, and the first steel pipe is connected to the second wing plate.

[0011] Two second H-shaped steel columns are respectively installed on the two side walls of the second steel plate. The second H-shaped steel column includes a third wing plate, a fourth wing plate, and a second web plate connected between the third wing plate and the fourth wing plate. The third wing plate is connected to the second steel plate, and the second steel pipe is connected to the fourth wing plate.

[0012] Optionally, the trench support fixture further includes a first cutting edge and a second cutting edge. The first cutting edge is connected between the first wing plate and the second wing plate, and the first cutting edge and the first wing plate form a first cutting edge structure. The second cutting edge is connected between the third wing plate and the fourth wing plate, and the second cutting edge and the third wing plate form a second cutting edge structure.

[0013] Optionally, the reinforcing steel plate includes H-beam cross braces and angle steel, and multiple H-beam cross braces and multiple angle steel are respectively provided between the two first H-beam columns and between the two second H-beam columns.

[0014] Optionally, this trench support fixture also includes steel plate hooks, with the steel plate hooks respectively installed at the upper ends of the two first H-shaped steel columns and the two second H-shaped steel columns.

[0015] Optionally, this trench support fixture also includes steel plate hooks, with the steel plate hooks respectively provided in the middle of the two first H-shaped steel columns and the two second H-shaped steel columns.

[0016] Optionally, a first support column is provided on the first H-shaped steel column, and a second support column is provided on the second H-shaped steel column. The first support column and the second support column are coaxially arranged, and the first steel pipe and the first support column are used to be sleeved with each other, and the second steel pipe and the second support column are used to be sleeved with each other.

[0017] In addition, the present invention also provides a trench excavation and support method, based on the trench support tooling described above, the trench excavation and support method comprising:

[0018] Trench excavation at the construction site;

[0019] The trench support equipment is assembled on a flat and solid ground.

[0020] The trench support fixture is hoisted into the trench;

[0021] The distance adjustment component of the trench support fixture is operated so that the first steel plate and the second steel plate of the trench support fixture are respectively attached to the two side walls of the trench.

[0022] Since the technical improvements and effects of the trench excavation and support method are the same as those of the trench support tooling, the technical effects of the trench excavation and support method will not be described in detail. Attached Figure Description

[0023] Figure 1 This is a perspective view of the trench support fixture according to an embodiment of the present invention;

[0024] Figure 2 This is a top view of the trench support fixture according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0026] Figure 4 for Figure 2 Enlarged view of section B in the middle.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First steel plate; 2. Second steel plate; 3. First H-beam column; 31. First wing plate; 32. Second wing plate; 33. First web plate; 34. First support column; 4. Second H-beam column; 41. Third wing plate; 42. Fourth wing plate; 43. Second web plate; 44. Second support column; 5. Reinforcing steel plate; 51. H-beam cross brace; 52. Angle steel; 6. Distance adjustment assembly; 61. First steel pipe; 62. Second steel pipe; 71. First cutting edge; 72. Second cutting edge; 8. Steel plate hook; 9. Steel plate tow hook. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] In the description of this invention, the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "top," "bottom," "front," "back," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this invention. They are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0033] Furthermore, in the attached diagram, the Z-axis represents the vertical direction, that is, the up-down position, and the positive direction of the Z-axis (that is, the direction the arrow points to) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down; in the attached diagram, the X-axis represents the horizontal direction, that is, the left-right position, and the positive direction of the X-axis (that is, the direction the arrow points to) represents right, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents left; in the attached diagram, the Y-axis represents the vertical direction, that is, the front-back position, and the positive direction of the Y-axis (that is, the direction the arrow points to) represents front, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents back.

[0034] It should also be noted that the meanings of the aforementioned Z-axis, X-axis and Y-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] like Figure 1 As shown, the trench support fixture of this embodiment includes: a first steel plate 1, a second steel plate 2, a first H-beam steel column 3, a second H-beam steel column 4, and reinforcing steel plates 5. The first steel plate 1 and the second steel plate 2 have the same structure and are symmetrically arranged. Two first H-beam steel columns 3 are spaced apart on the first steel plate 1, and two second H-beam steel columns 4 are spaced apart on the second steel plate 2. Multiple reinforcing steel plates 5 are spaced apart between the two first H-beam steel columns 3 and between the two second H-beam steel columns 4. The trench support fixture also includes a tool for adjusting... The first steel plate 1 and the second steel plate 2 are connected to a distance adjustment assembly 6 that allows them to move closer or further apart. The distance adjustment assembly 6 includes a first steel pipe 61, a second steel pipe 62, and a limiting member. The first steel pipe 61 is connected to the first H-shaped steel column 3, and the second steel pipe 62 is connected to the second H-shaped steel column 4. The first steel pipe 61 and the second steel pipe 62 are coaxially arranged and used to be sleeved with each other. The limiting member is detachably connected to the first steel pipe 61 and the second steel pipe 62 and is used to restrict the relative movement of the first steel pipe 61 and the second steel pipe 62.

[0036] In this embodiment, in conjunction with the appendix Figure 1As shown, in use, this trench support fixture can be hoisted into the trench using a crane or other lifting machinery. Then, the distance adjustment component 6 is used to attach the first steel plate 1 and the second steel plate 2 to the two side walls of the trench, respectively. A limiting component can then be connected to the first steel pipe 61 and the second steel pipe 62 to restrict relative movement between them. This trench support fixture, by incorporating the distance adjustment component 6, allows for adjustment of the distance between the first steel plate 1 and the second steel plate 2 according to the width of the trench. This enables the same set of trench support fixtures to be used with trenches of different widths, thus broadening its applicability. Furthermore, multiple reinforcing steel plates 5 are spaced apart between the two first H-shaped steel columns 3 and between the two second H-shaped steel columns 4, ensuring that the strength, stiffness, and stability of this fixture under ultimate load-bearing capacity conditions meet the requirements of the "Technical Specification for Foundation Pit Support" and the "Code for Design of Steel Structures," preventing safety hazards for workers operating in the trench.

[0037] Optionally, the first steel pipe 61 is provided with a plurality of first connecting parts at intervals along its length, and the second steel pipe 62 is provided with a plurality of second connecting parts at intervals along its length, wherein the first connecting parts and the second connecting parts are used to connect through the limiting member.

[0038] The limiting component is a pin, the first connecting part is a first through hole, and the second connecting part is a second through hole. The first through hole and the second through hole are used to connect through the pin to fix the first steel pipe 61 relative to the second steel pipe 62.

[0039] In this embodiment, the first steel pipe 61 and the second steel pipe 62 are two hollow steel pipe structures that can be nested together. For example, combined with the attached... Figure 1 Or attached Figure 2 As shown, the diameter of the first steel pipe 61 is slightly larger than (or equal to) the outer diameter of the second steel pipe 62, allowing the second steel pipe 62 to be inserted into the first steel pipe 61. This enables relative movement between the first steel pipe 61 and the second steel pipe 62, thereby allowing adjustment of the first steel plate 1 and the second steel plate 2 to move closer or further apart. The first steel pipe 61 extends along its length (see attached diagram). Figure 1 Or attached Figure 2 Multiple first through holes are spaced apart along the Y-axis direction, and the second steel pipe 62 is arranged along its length direction (see attached). Figure 1 Or attached Figure 2 Multiple second through holes corresponding to the first through hole are spaced apart along the Y-axis direction. The first through hole and the second through hole can be connected by a pin to fix the first steel pipe 61 relative to the second steel pipe 62.

[0040] Optionally, two first H-shaped steel columns 3 are respectively disposed on the two side walls of the first steel plate 1. The first H-shaped steel column 3 includes a first wing plate 31, a second wing plate 32 and a first web plate 33 connected between the first wing plate 31 and the second wing plate 32. The first wing plate 31 is connected to the first steel plate 1 and the first steel pipe 61 is connected to the second wing plate 32.

[0041] Two second H-shaped steel columns 4 are respectively installed on the two side walls of the second steel plate 2. The second H-shaped steel column 4 includes a third wing plate 41, a fourth wing plate 42 and a second web plate 43 connected between the third wing plate 41 and the fourth wing plate 42. The third wing plate 41 is connected to the second steel plate 2 and the second steel pipe 62 is connected to the fourth wing plate 42.

[0042] In this embodiment, in conjunction with the appendix Figures 2 to 4 As shown, the two first H-shaped steel columns 3 can be connected to the two side walls of the first steel plate 1 by welding (see attached diagram). Figure 2 (In the X-axis direction), the first H-shaped steel column 3 is an H-shaped steel column, which includes a first flange 31, a second flange 32, and a first web 33 connecting the first flange 31 and the second flange 32. The two first flanges 31 can be welded to the side walls of the first steel plate 1. Similarly, the two second H-shaped steel columns 4 can be welded to the side walls of the second steel plate 2 (see attached diagram). Figure 2 (In the X-axis direction), the second H-shaped steel column 4 is an H-shaped steel, which includes a third wing plate 41, a fourth wing plate 42 and a second web plate 43 connected between the third wing plate 41 and the fourth wing plate 42. The two third wing plates 41 can be welded to the two side walls of the second steel plate 2 by welding.

[0043] Optionally, the trench support fixture further includes a first cutting edge 71 and a second cutting edge 72. The first cutting edge 71 is connected between the first wing plate 31 and the second wing plate 32, and the first cutting edge 71 and the first wing plate 31 form a first cutting edge structure. The second cutting edge 72 is connected between the third wing plate 41 and the fourth wing plate 42, and the second cutting edge 72 and the third wing plate 41 form a second cutting edge structure.

[0044] In this embodiment, in conjunction with the appendix Figures 2 to 4 As shown, two first H-shaped steel columns 3 are respectively provided with first blades 71 on the outer side of the first steel plate 1, wherein the first blades 71 are long strip steel plate structures, and the first blades 71 are vertically oriented (see attached diagram). Figure 1One side wall of the first cutting edge 71 (in the Z-axis direction) can be welded to the side wall of the first flange 31 away from the first steel plate 1. The other side wall of the first cutting edge 71 in the vertical direction can be welded to the intersection of the second flange 32 and the first web 33. The first cutting edge 71 and the first flange 31 form a first cutting angle structure, which facilitates soil cutting. Similarly, two second H-shaped steel columns 4 are respectively provided with second cutting edges 72 on the outer side of the second steel plate 2. The second cutting edge 72 is a long strip steel plate structure. The second cutting edge 72 in the vertical direction (attached) Figure 1 One side wall of the second blade plate 72 (in the Z-axis direction) can be welded to the side wall of the third wing plate 41 away from the second steel plate 2. The other side wall of the second blade plate 72 in the vertical direction can be welded to the intersection of the fourth wing plate 42 and the second web plate 43. The second blade plate 72 and the third wing plate 41 form a second blade angle structure, which facilitates cutting the soil.

[0045] Optionally, the reinforcing steel plate 5 includes H-beam cross braces 51 and angle steel 52, and multiple H-beam cross braces 51 and multiple angle steel 52 are respectively spaced between the two first H-beam columns 3 and between the two second H-beam columns 4.

[0046] In this embodiment, in conjunction with the appendix Figure 1 As shown, multiple H-beam cross braces 51 and multiple angle steels 52 are respectively provided between the two first H-beam steel columns 3 and between the two second H-beam steel columns 4. The multiple H-beam steel cross braces 51 and multiple angle steels 52 can be connected between the two first H-beam steel columns 3 and between the two second H-beam steel columns 4 by welding. The multiple H-beam steel cross braces 51 and multiple angle steels 52 can abut against the inner wall of the first steel plate 1 and the second steel plate 2, or the multiple H-beam steel cross braces 51 and multiple angle steels 52 can be welded to the inner wall of the first steel plate 1 and the second steel plate 2.

[0047] Optionally, this trench support fixture also includes steel plate hooks 8, with the steel plate hooks 8 respectively installed at the upper ends of the two first H-shaped steel columns 3 and the two second H-shaped steel columns 4.

[0048] In this embodiment, in conjunction with the appendix Figure 1 As shown, the upper ends of the two first H-shaped steel columns 3 and the two second H-shaped steel columns 4 (attached) Figure 1 Steel plate hooks 8 are respectively installed in the positive direction of the Z-axis. The steel plate hooks 8 can be plate-shaped structures with through holes. The four steel plate hooks 8 can be connected to the upper ends of the two first H-shaped steel columns 3 and the two second H-shaped steel columns 4 by welding. The four steel plate hooks 8 can be used with cranes or other lifting machinery to lift the trench support equipment into the trench.

[0049] Optionally, this trench support fixture also includes steel plate hooks 9, with the steel plate hooks 9 respectively provided in the middle of the two first H-shaped steel columns 3 and the two second H-shaped steel columns 4.

[0050] In this embodiment, in conjunction with the appendix Figure 1 As shown, steel plate hooks 9 are respectively installed in the middle of the two first H-shaped steel columns 3 and the two second H-shaped steel columns 4. The steel plate hooks 9 can be plate-shaped structures with through holes. The four steel plate hooks 9 can be connected to the middle of the two first H-shaped steel columns 3 and the two second H-shaped steel columns 4 by welding. The four steel plate hooks 9 can be used with relevant equipment to move the trench support tool in the trench.

[0051] Optionally, a first support column 34 is provided on the first H-shaped steel column 3, and a second support column 44 is provided on the second H-shaped steel column 4. The first support column 34 and the second support column 44 are coaxially arranged. The first steel pipe 61 is used to be sleeved with the first support column 34, and the second steel pipe 62 is used to be sleeved with the second support column 44.

[0052] In this embodiment, in conjunction with the appendix Figure 2 As shown, the first support column 34 is a hollow steel pipe structure, and its length can be 1 / 5 to 1 / 4 of the length of the first steel pipe 61. The first steel pipe 61 and the first support column 34 can be nested together. The first support column 34 can have a through hole, so that the first steel pipe 61 can be connected to the first support column 34 via a pin. Similarly, the second support column 44 is a hollow steel pipe structure, and its length can be 1 / 5 to 1 / 4 of the length of the second steel pipe 62. The second steel pipe 62 and the second support column 44 can be nested together. The second support column 44 can have a through hole, so that the second steel pipe 62 can be connected to the second support column 44 via a pin. Thus, this trench support fixture is a prefabricated structure that can be assembled on-site, facilitating transportation, installation, dismantling, and hoisting. This reduces the labor requirements and shortens the trench support construction period to a certain extent.

[0053] It should be noted that the distance adjustment component 6 of this trench support tooling can be equipped with multiple components, in conjunction with the attached... Figure 1 As shown, the distance adjustment component 6 can be four.

[0054] In addition, the present invention also provides a trench excavation and support method, based on the trench support tooling described above, the trench excavation and support method comprising:

[0055] Trench excavation at the construction site;

[0056] The trench support equipment is assembled on a flat and solid ground.

[0057] The trench support fixture is hoisted into the trench;

[0058] The distance adjustment component 6 of the trench support fixture is operated so that the first steel plate 1 and the second steel plate 2 of the trench support fixture are respectively attached to the two side walls of the trench.

[0059] Since the technical improvements and effects of the trench excavation and support method are the same as those of the trench support tooling, the technical effects of the trench excavation and support method will not be described in detail.

[0060] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0061] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A trench support tool, characterized in that, include: The equipment comprises a first steel plate (1), a second steel plate (2), a first H-shaped steel column (3), a second H-shaped steel column (4), and a reinforcing steel plate (5). The first steel plate (1) and the second steel plate (2) have the same structure and are symmetrically arranged. Two first H-shaped steel columns (3) are spaced apart on the first steel plate (1), and two second H-shaped steel columns (4) are spaced apart on the second steel plate (2). Multiple reinforcing steel plates (5) are spaced apart between the two first H-shaped steel columns (3) and between the two second H-shaped steel columns (4). The trench support fixture also includes a distance adjustment component (6) for adjusting the first steel plate (1) and the second steel plate (2) to move closer or further apart from each other. Component (6) includes a first steel pipe (61), a second steel pipe (62), and a limiting member. The first steel pipe (61) is connected to the first H-shaped steel column (3), and the second steel pipe (62) is connected to the second H-shaped steel column (4). The first steel pipe (61) and the second steel pipe (62) are coaxially arranged and used for mutual sleeve connection. The limiting member is detachably connected to the first steel pipe (61) and the second steel pipe (62) and is used to restrict the relative movement of the first steel pipe (61) and the second steel pipe (62). The two first H-shaped steel columns (3) are respectively arranged on the two side walls of the first steel plate (1). The first H-shaped steel column (3) includes a first wing plate (31) and a second wing plate (32). The first web (33) is connected between the first wing plate (31) and the second wing plate (32), the first wing plate (31) is connected to the first steel plate (1), and the first steel pipe (61) is connected to the second wing plate (32); two second H-shaped steel columns (4) are respectively disposed on the two side walls of the second steel plate (2), the second H-shaped steel column (4) includes a third wing plate (41), a fourth wing plate (42) and a second web (43) connected between the third wing plate (41) and the fourth wing plate (42), the third wing plate (41) is connected to the second steel plate (2), and the second steel pipe (62) is connected to the fourth wing plate (42); the reinforcing steel plate (5) includes H The cross bracing (51) and angle steel (52) of the steel profile are provided at intervals between the two first H-shaped steel columns (3) and between the two second H-shaped steel columns (4); the trench support tooling also includes a first cutting edge (71) and a second cutting edge (72). The first cutting edge (71) is connected between the first wing plate (31) and the second wing plate (32), and the first cutting edge (71) and the first wing plate (31) form a first cutting edge structure; the second cutting edge (72) is connected between the third wing plate (41) and the fourth wing plate (42), and the second cutting edge (72) and the third wing plate (41) form a second cutting edge structure.

2. The trench support fixture according to claim 1, characterized in that, The first steel pipe (61) is provided with a plurality of first connecting parts at intervals along its length direction, and the second steel pipe (62) is provided with a plurality of second connecting parts at intervals along its length direction. The first connecting parts and the second connecting parts are used to connect through the limiting member.

3. The trench support fixture according to claim 2, characterized in that, The limiting component is a pin, the first connecting part is a first through hole, and the second connecting part is a second through hole. The first through hole and the second through hole are used to connect through the pin to fix the first steel pipe (61) relative to the second steel pipe (62).

4. The trench support fixture according to claim 1, characterized in that, It also includes steel plate hooks (8), and the upper ends of the two first H-shaped steel columns (3) and the two second H-shaped steel columns (4) are respectively provided with the steel plate hooks (8).

5. The trench support fixture according to claim 1, characterized in that, It also includes steel plate hooks (9), and the steel plate hooks (9) are respectively provided in the middle part of the two first H-shaped steel columns (3) and the two second H-shaped steel columns (4).

6. The trench support fixture according to claim 1, characterized in that, The first H-shaped steel column (3) is provided with a first support column (34), and the second H-shaped steel column (4) is provided with a second support column (44). The first support column (34) and the second support column (44) are coaxially arranged. The first steel pipe (61) and the first support column (34) are used to be sleeved with each other, and the second steel pipe (62) and the second support column (44) are used to be sleeved with each other.

7. A method for trench excavation and support, characterized in that, Based on the trench support fixture as described in any one of claims 1-6, the trench excavation and support method includes: Trench excavation at the construction site; The trench support equipment is assembled on a flat and solid ground. The trench support fixture is hoisted into the trench; Manipulate the distance adjustment component (6) of the trench support fixture so that the first steel plate (1) and the second steel plate (2) of the trench support fixture are respectively attached to the two side walls of the trench.

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