Foldable integrated trench excavation supporting structure and construction method

Abstract

The foldable integrated trench excavation supporting structure comprises a first supporting structural plate, a second supporting structural plate and a plurality of transverse structural members, first connecting parts are arranged at the two ends of the transverse structural members correspondingly, and second connecting parts corresponding to the first connecting parts are arranged on the first supporting structural plate and the second supporting structural plate; the first connecting part is movably connected with the second connecting part, a plurality of fixing holes are correspondingly formed in the first connecting part and the second connecting part, and the first connecting part and the second connecting part which are rotated can be fixed through a fastener; the first supporting structural plate and the second supporting structural plate can be driven to form a folded state and an unfolded state through relative rotation of the first connecting part and the second connecting part; when the supporting structure is used, the first supporting structure plate and the second supporting structure plate can be switched to the folded state only by lifting the first supporting structure plate and the second supporting structure plate through a lifting rope and rotating the opening structure through lifting equipment, the folded state can be switched to the unfolded state, and rapid supporting construction of non-intrusive trench excavation can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction support, and in particular to a foldable integrated trench excavation support structure and a construction method. Background Art

[0002] In the existing trench excavation support form, invasive enclosure structure construction or anchor structure construction is often required, which causes great damage to the original site and requires a certain amount of time and cost to restore. Therefore, a support structure form that does not require intrusion and can be constructed quickly is needed. Summary of the invention

[0003] In view of the above-mentioned technical problems existing in the existing trench support forms, the purpose of the present invention is to provide a foldable integrated trench excavation support structure and a construction method, which is an integrated foldable structure and does not need to be disassembled. It can be switched to a folded state during transportation. When in use, it only needs to use a lifting device to lift the first support structure plate and the second support structure plate through a lifting rope and rotate the structure to open it, so as to switch from the folded state to the unfolded state. Then, the support structure in the unfolded state is lifted into the trench through the lifting setting, and the first support structure plate and the second support structure plate are respectively supported on both sides of the trench, thereby realizing rapid support construction without intrusive trench excavation.

[0004] In order to achieve the above-mentioned object, the foldable integrated trench excavation support structure provided by the present invention comprises a first support structure plate, a second support structure plate, and a plurality of transverse structural members, wherein the plurality of transverse structural members are sequentially arranged between the first support structure plate and the second support structure plate, and the two ends of the transverse structural members are respectively provided with a first connecting portion, and the first support structure plate and the second support structure plate are provided with a second connecting portion corresponding to the first connecting portion;

[0005] The first connection part is movably connected to the second connection part, and the first connection part and the second connection part can rotate relative to each other. The first connection part and the second connection part are correspondingly provided with a plurality of fixing holes, and the first connection part and the second connection part can be fixed after rotation by fasteners passing through the fixing holes on the first connection part and the second connection part;

[0006] The first connecting portion and the second connecting portion rotate relative to each other, so that the first supporting structure plate and the second supporting structure plate can be driven to form a folded state and an unfolded state;

[0007] In the unfolded state, the first supporting structure plate and the second supporting structure plate are arranged opposite to each other, and a plurality of transverse structural members are vertically arranged between the first supporting structure plate and the second supporting structure plate. In the folded state, the first supporting structure plate and the second supporting structure plate form an upper and lower parallel staggered state, and a plurality of transverse structural members are sequentially and parallelly arranged between the first supporting structure plate and the second supporting structure plate.

[0008] Furthermore, a plurality of lifting ears are provided on the first supporting structure plate and the second supporting structure plate.

[0009] Furthermore, the first connecting portion includes a first connecting plate and a plug plate, wherein the first connecting plate is fixed to one end of the transverse structural member, the plug plate is fixed to the first connecting plate, and a first rotating hole is provided on the plug plate.

[0010] Furthermore, the second connecting part includes a second connecting plate and two supporting plates. The second connecting plate is fixed on the first supporting structure plate and the second supporting structure plate. The two supporting plates are relatively and symmetrically arranged on the second connecting plate. A space for the plug-in plate to be placed is formed between the two supporting plates. Both supporting plates are provided with a second rotating hole corresponding to the first rotating hole. The second rotating hole is coaxial with the first rotating hole. The first connecting part and the second connecting part can be movably connected by a movable connecting piece that is inserted into the first rotating hole and the second rotating hole and connected.

[0011] Furthermore, the plug plate is provided with a first fixing hole and a second fixing hole, and the two support plates are provided with a third fixing hole and a fourth fixing hole corresponding to the first fixing hole and the second fixing hole respectively;

[0012] In the unfolded state, the first fixing hole is coaxial with the third fixing holes on the two support plates, and the second fixing hole is coaxial with the fourth fixing holes on the two support plates. Two fasteners are respectively passed through the first fixing hole and the third fixing hole and fixed, and passed through the second fixing hole and the fourth fixing hole and fixed, so as to fix the first connecting part and the second connecting part in the unfolded state;

[0013] When in the folded state, the plug plate rotates around the movable connecting piece through the first rotating hole, and the positions of the first fixing hole and the second fixing hole on the plug plate change. By rotating the plug plate toward the first direction or the second direction, the first fixing hole on the plug plate can be made coaxial with the fourth fixing hole on the carrier plate, or the second fixing hole can be made coaxial with the third fixing hole on the carrier plate. The fastener passes through the first fixing hole and the fourth fixing hole and fixes them, or passes through the second fixing hole and the third fixing hole and fixes them, so as to fix the first connecting part and the second connecting part in the folded state.

[0014] Furthermore, the movable connecting part includes a pin body and a limit head connected to both ends of the pin body, the pin body is inserted into the first rotating hole and the second rotating hole, the diameter of the limit heads at both ends is larger than the aperture of the first rotating hole and the second rotating hole, and the plug plate and the two support plates can be limited between the two limit heads.

[0015] Furthermore, the first supporting structure plate and the second supporting structure plate have the same structure, both consisting of a first split plate and a second split plate, the first split plate and the second split plate are connected by anchor nails; and the first split plate and the second split plate adopt a modular length corrugated plate structure.

[0016] In order to achieve the above object, the present invention provides a construction method of a foldable integrated trench excavation support structure, which is used for any one of the above items, and the construction method comprises:

[0017] S1: During processing, firstly, two ends of the transverse connecting member are connected to the second connecting portions on the first supporting structure plate and the second supporting structure plate through the first connecting portion, and firstly, the movable connecting member is passed through the first rotating hole and the second rotating hole and connected, so as to movably connect the first connecting portion and the second connecting portion;

[0018] S2: During transportation, the support structure is rotated to a folded state by driving the first connection part and the second connection part to rotate, and the fastener is passed through the first fixing hole and the fourth fixing hole and fixed, or passed through the second fixing hole and the third fixing hole and fixed, so as to fix the support structure in the folded state;

[0019] S3: During the rotation, only the movable connecting pieces in the first rotation hole and the second rotation hole are retained, and the first supporting structure plate and the second supporting structure plate are lifted by the lifting equipment and then rotated in parallel;

[0020] S4: After the rotation is completed, two fasteners are respectively passed through the first fixing hole and the third fixing hole and fixed, and passed through the second fixing hole and the fourth fixing hole and fixed, so as to fix the support structure in the deployed state;

[0021] S5: Before trench excavation, the support structure in the S4 state is placed near the trench. When the trench is excavated to a certain depth, the first support structure plate and the second support structure plate are hoisted as a whole into the trench by a lifting device, and the lower excavation is carried out in a supported state. After excavation to the structural construction surface, the structure construction in the communication trench is carried out. After backfilling, the support structure is hoisted to the next trench section for construction.

[0022] The foldable integrated trench excavation support structure and construction method provided by the present invention are an integrated foldable structure, which does not need to be disassembled and can be switched to a folded state during transportation. When in use, it is only necessary to lift the first support structure plate and the second support structure plate through a lifting rope through a lifting device and rotate the structure to open it, so as to switch from the folded state to the unfolded state. The support structure in the unfolded state is then lifted into the trench through the lifting setting, and the first support structure plate and the second support structure plate are respectively supported on both sides of the trench, thereby realizing rapid support construction of non-invasive trench excavation.

[0023] Compared with the prior art, the foldable integrated trench excavation support structure and construction method provided by the present invention also have the following beneficial effects:

[0024] (1) Project duration benefits;

[0025] A foldable integrated trench excavation support structure can realize the integrated construction of the trench excavation support structure, and rapid folding and unfolding can greatly reduce the installation and dismantling period of the support structure.

[0026] (2) Economic benefits;

[0027] A foldable integrated trench excavation support structure is a rotatable and reusable structural system. After a section of trench excavation is completed, it can be folded for transportation and reuse, which reduces both the production cost of the support structure and the transportation cost.

[0028] (3) Quality and efficiency;

[0029] A foldable integrated trench excavation support structure can realize the integration of the trench excavation support structure and reduce the errors caused by assembling scattered components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Figure 1 A schematic diagram of the structure of the foldable integrated trench excavation support structure provided by the present invention in an unfolded state;

[0032] Figure 2 A schematic diagram of the structure of the foldable integrated trench excavation support structure provided by the present invention in a folded state;

[0033] Figure 3 A schematic diagram of a first connecting portion and a second connecting portion of the foldable integrated trench excavation support structure provided by the present invention when the structure is in an unfolded state;

[0034] Figure 4 A schematic diagram of the exploded structure of the first connecting part and the second connecting part of the foldable integrated trench excavation support structure provided by the present invention when the structure is in an unfolded state;

[0035] Figure 5 A schematic diagram of a first connecting portion and a second connecting portion of the foldable integrated trench excavation support structure provided by the present invention in a folded state;

[0036] Figure 6 A schematic diagram of the exploded structure of the first connecting part and the second connecting part of the foldable integrated trench excavation support structure provided by the present invention when the structure is in a folded state;

[0037] Illustration Description:

[0038] A first supporting structure plate 100, a second supporting structure plate 200, a transverse structural member 300, a movable connecting member 400, and a fastener 500;

[0039] The second connecting part 110, the second connecting plate 111, the supporting plate 112, the second rotating hole 113, the third fixing hole 114, the fourth fixing hole 115, the lifting ear 120, the first connecting part 310, the first connecting plate 311, the plug plate 312, the first rotating hole 313, the first fixing hole 314, the second fixing hole 315, the pin body 410, and the limiting head 420. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0041] Embodiment 1:

[0042] See also Figure 1-Figure 2 , which is a schematic structural diagram of the foldable integrated trench excavation support structure provided by the present invention.

[0043] As can be seen from the figure, the foldable integrated trench excavation support structure provided by the present invention includes three components: a first support structure plate 100, a second support structure plate 200, and a plurality of transverse structural members 300.

[0044] A plurality of transverse structural members 300 are sequentially arranged between the first supporting structure plate 100 and the second supporting structure plate 200 . The transverse structural members 300 are used to connect the first supporting structure plate 100 and the second supporting structure plate 200 .

[0045] The two ends of the transverse structural member 300 are respectively provided with first connecting parts 310, and the first supporting structure plate 100 and the second supporting structure plate 200 are matched with second connecting parts 110 corresponding to the first connecting parts 310;

[0046] The first connection part 310 is movably connected to the second connection part 110. The first connection part 310 and the second connection part 110 can rotate relative to each other. The first connection part 310 and the second connection part 110 are provided with a plurality of fixing holes correspondingly. The first connection part 310 and the second connection part 110 can be fixed to each other after rotation by fasteners passing through the fixing holes on the first connection part and the second connection part.

[0047] The first connecting portion 310 and the second connecting portion 110 rotate relative to each other, so as to drive the first supporting structure plate 100 and the second supporting structure plate 200 to form a folded state and an unfolded state;

[0048] In the unfolded state, the first supporting structure plate 100 and the second supporting structure plate 200 are arranged opposite to each other, and a plurality of transverse structural members 300 are vertically arranged between the first supporting structure plate 100 and the second supporting structure plate 200. In the folded state, the first supporting structure plate 100 and the second supporting structure plate 200 form a vertically parallel staggered state, and a plurality of transverse structural members 300 are sequentially and parallelly arranged between the first supporting structure plate 100 and the second supporting structure plate 200.

[0049] Compared with the prior art, the foldable integrated trench excavation support structure provided by the present solution is an integrated foldable structure, which does not need to be disassembled and can be switched to a folded state during transportation. When in use, it is only necessary to lift the first support structure plate 100 and the second support structure plate 200 through a lifting rope through a lifting device and rotate the structure to open it, so as to switch from the folded state to the unfolded state, and then lift the support structure in the unfolded state into the trench through the lifting setting, and support the two sides of the trench respectively by the first support structure plate 100 and the second support structure plate 200, thereby realizing rapid construction of support without intrusive trench excavation.

[0050] Specifically, the first supporting structure plate 100 and the second supporting structure plate 200 are conventional supporting structure plates. The first supporting structure plate 100 and the second supporting structure plate 200 are provided with a plurality of lifting ears 120 , and the lifting ears 120 can be connected to the lifting ears 120 by lifting ropes for lifting equipment.

[0051] The transverse structural member 300 in this example preferably adopts an I-shaped steel structure, which is connected between the first supporting structure plate 100 and the second supporting structure plate 200 and is used for bearing transverse force during trench excavation support.

[0052] Furthermore, if Figure 3-Figure 6 The first connecting portion 310 includes a first connecting plate 311 and a plug plate 312. The first connecting plate 311 is fixed to one end of the transverse structural member 300. The plug plate 312 is fixed to the first connecting plate 311. The plug plate 312 is provided with a first rotating hole 313.

[0053] The present solution does not limit the specific connection method between the first connecting plate 311 and the transverse structural member 300 and the specific connection method between the plug plate 312 and the second connecting plate 311, which can be determined according to actual needs. For example, the present solution preferably adopts welding.

[0054] The second connecting portion 110 includes a second connecting plate 111 and two supporting plates 112. The second connecting plate 111 is fixed on the first supporting structure plate 100 and the second supporting structure plate 200. The two supporting plates 112 are relatively and symmetrically arranged on the second connecting plate 111. A space for the plug plate 312 to be placed is formed between the two supporting plates 112. Both supporting plates 112 are provided with a second rotating hole 113 corresponding to the first rotating hole 313. The second rotating hole 113 is coaxial with the first rotating hole 313. The first connecting portion 310 and the second connecting portion 110 can be movably connected by a movable connection 400 that penetrates the first rotating hole 313 and the second rotating hole 113 and is connected.

[0055] The insert plate 312 is provided with a first fixing hole 314 and a second fixing hole 315 , and the two support plates 112 are provided with a third fixing hole 114 and a fourth fixing hole 115 corresponding to the first fixing hole 314 and the second fixing hole 315 , respectively.

[0056] In the unfolded state, the first fixing hole 314 is coaxial with the third fixing hole 114 on the two support plates 112, and the second fixing hole 315 is coaxial with the fourth fixing hole 115 on the two support plates 112. Two fasteners 400 are respectively passed through the first fixing hole 314 and the third fixing hole 114 and fixed, and passed through the second fixing hole 315 and the fourth fixing hole 115 and fixed, so as to fix the first connecting portion 310 and the second connecting portion 110 in the unfolded state;

[0057] When in the folded state, the plug plate 312 rotates around the movable connecting piece 400 through the first rotating hole 313, and the positions of the first fixing hole 314 and the second fixing hole 315 on the plug plate 312 change. By rotating the plug plate 312 toward the first direction or the second direction, the first fixing hole 314 on the plug plate 312 can be made coaxial with the fourth fixing hole 115 on the carrier plate 112, or the second fixing hole 315 can be made coaxial with the third fixing hole 114 on the carrier plate 112. The fastener 500 passes through the first fixing hole 314 and the fourth fixing hole 115 and fixes them, or passes through the second fixing hole 315 and the third fixing hole 114 and fixes them, so as to fix the first connecting part 310 and the second connecting part 110 in the folded state.

[0058] Furthermore, if Figure 5 In the folded state, the first connecting plate 311 and the second connecting plate 111 are in a vertical state, and the plurality of transverse structural members 300 are switched from being parallel to the horizontal plane to being perpendicular to the horizontal plane. The transverse structural members 300 are respectively close to the two sides of the first supporting structure plate 100 and the second supporting structure plate 200 and are respectively in contact with the first supporting structure plate 100 and the second supporting structure plate 200. At this time, the folded state is obtained.

[0059] like Figure 4The movable connecting member 400 is a pin body 410 and a limiting head 420 connected to both ends of the pin body 410. The pin body 410 is inserted into the first rotating hole 313 and the second rotating hole 113. The limiting heads 420 at both ends have a diameter greater than the aperture of the first rotating hole 313 and the second rotating hole 113, and can limit the plug plate 312 and the two carrier plates 112 between the two limiting heads 420.

[0060] The present solution does not limit the structure of the fastener 500 , which can be determined according to actual needs. For example, a freely detachable pin or bolt can be used.

[0061] Based on the foldable integrated trench excavation support structure formed by the above scheme, this scheme also provides a construction method, and the construction steps are as follows:

[0062] S1: During processing, firstly, the two ends of the transverse connecting member 200 are connected to the first supporting structure plate 100 and the second connecting portion 110 on the second supporting structure plate 200 through the first connecting portion 310, and the movable connecting member 400 is passed through the first rotating hole 313 and the second rotating hole 113 and connected, so as to movably connect the first connecting portion 310 and the second connecting portion 110;

[0063] S2: During transportation, the support structure is rotated to a folded state by driving the first connection part 310 and the second connection part 110 to rotate, and the fastener 500 is passed through the first fixing hole 314 and the fourth fixing hole 115 and fixed, or passed through the second fixing hole 315 and the third fixing hole 114 and fixed, so as to fix the support structure in the folded state. Figure 2 ;

[0064] S3: During rotation, only the movable connecting member 400 in the first rotation hole 313 and the second rotation hole 113 is retained, and the first supporting structure plate 100 and the second supporting structure plate 200 are lifted by the lifting equipment and then rotated in parallel;

[0065] S4: After the rotation is completed, the two fasteners 400 are respectively passed through the first fixing hole 314 and the third fixing hole 114 and fixed, and passed through the second fixing hole 315 and the fourth fixing hole 115 and fixed, so as to fix the support structure in the unfolded state. Figure 1 As shown;

[0066] S5: Before trench excavation, the support structure in the S4 state is placed near the trench. When the trench is excavated to a certain depth, the first support structure plate 100 and the second support structure plate 200 are hoisted as a whole into the trench by a lifting device, and the lower excavation is carried out in a supported state. After excavation to the structural construction surface, the structure construction in the communication trench is carried out. After backfilling, the support structure is hoisted to the next trench section for construction.

[0067] Embodiment 2:

[0068] This embodiment describes the structures of the first supporting structure plate 100 and the second supporting structure plate 200 on the basis of the first embodiment, and the other structures are the same and will not be described in detail here.

[0069] The first supporting structure plate 100 and the second supporting structure plate 200 in Example 1 are an integrated conventional supporting plate structure, while the first supporting structure plate 100 and the second supporting structure plate 200 in this embodiment are unconventional supporting plate structures to improve structural strength and adopt a split structure. When split, the two are connected in a detachable manner to achieve assembly and modularization of the overall structure.

[0070] The first supporting structure plate 100 and the second supporting structure plate 200 have the same structure, and in this embodiment are composed of a first split plate and a second split plate, and the first split plate and the second split plate are connected by anchor nails.

[0071] In addition, the first split plate and the second split plate adopt a modular length corrugated plate structure, and the rigidity of the corrugated plate structure is improved while the structural weight is reduced.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A foldable integrated trench excavation support structure, characterized in that: The invention comprises a first supporting structure plate, a second supporting structure plate, and a plurality of transverse structural members, wherein the plurality of transverse structural members are sequentially arranged between the first supporting structure plate and the second supporting structure plate, and first connecting parts are respectively arranged at both ends of the transverse structural members, and second connecting parts corresponding to the first connecting parts are arranged on the first supporting structure plate and the second supporting structure plate; The first connection part is movably connected to the second connection part, and the first connection part and the second connection part can rotate relative to each other. The first connection part and the second connection part are correspondingly provided with a plurality of fixing holes, and the first connection part and the second connection part can be fixed after rotation by fasteners passing through the fixing holes on the first connection part and the second connection part; The first connecting portion and the second connecting portion rotate relative to each other, so that the first supporting structure plate and the second supporting structure plate can be driven to form a folded state and an unfolded state; In the unfolded state, the first supporting structure plate and the second supporting structure plate are arranged opposite to each other, and a plurality of transverse structural members are vertically arranged between the first supporting structure plate and the second supporting structure plate. In the folded state, the first supporting structure plate and the second supporting structure plate form an upper and lower parallel staggered state, and a plurality of transverse structural members are sequentially and parallelly arranged between the first supporting structure plate and the second supporting structure plate.

2. The foldable integrated trench excavation support structure according to claim 1, characterized in that: The first supporting structure plate and the second supporting structure plate are provided with a plurality of lifting ears.

3. The foldable integrated trench excavation support structure according to claim 1, characterized in that: The first connecting portion includes a first connecting plate and a plug plate. The first connecting plate is fixed to one end of the transverse structural member. The plug plate is fixed to the first connecting plate. A first rotating hole is provided on the plug plate.

4. The foldable integrated trench excavation support structure according to claim 3 is characterized in that: The second connecting part includes a second connecting plate and two supporting plates. The second connecting plate is fixed to the first supporting structure plate and the second supporting structure plate. The two supporting plates are relatively and symmetrically arranged on the second connecting plate. A space for the plug-in plate to be placed is formed between the two supporting plates. Both supporting plates are provided with a second rotating hole corresponding to the first rotating hole. The second rotating hole is coaxial with the first rotating hole. The first connecting part and the second connecting part can be movably connected by a movable connecting piece that is inserted into the first rotating hole and the second rotating hole and connected.

5. The foldable integrated trench excavation support structure according to claim 4, characterized in that: The plug plate is provided with a first fixing hole and a second fixing hole, and the two support plates are respectively provided with a third fixing hole and a fourth fixing hole corresponding to the first fixing hole and the second fixing hole; In the unfolded state, the first fixing hole is coaxial with the third fixing holes on the two support plates, and the second fixing hole is coaxial with the fourth fixing holes on the two support plates. Two fasteners are respectively passed through the first fixing hole and the third fixing hole and fixed, and passed through the second fixing hole and the fourth fixing hole and fixed, so as to fix the first connecting part and the second connecting part in the unfolded state; When in the folded state, the plug plate rotates around the movable connecting piece through the first rotating hole, and the positions of the first fixing hole and the second fixing hole on the plug plate change. By rotating the plug plate toward the first direction or the second direction, the first fixing hole on the plug plate can be made coaxial with the fourth fixing hole on the carrier plate, or the second fixing hole can be made coaxial with the third fixing hole on the carrier plate. The fastener passes through the first fixing hole and the fourth fixing hole and fixes them, or passes through the second fixing hole and the third fixing hole and fixes them, so as to fix the first connecting part and the second connecting part in the folded state.

6. The foldable integrated trench excavation support structure according to claim 4, characterized in that: The movable connecting piece includes a pin body and limit heads connected to both ends of the pin body. The pin body is inserted into the first rotating hole and the second rotating hole. The diameters of the limit heads at both ends are larger than the apertures of the first rotating hole and the second rotating hole, and the plug plate and the two support plates can be limited between the two limit heads.

7. The foldable integrated trench excavation support structure according to claim 1, characterized in that: The first supporting structure plate and the second supporting structure plate have the same structure, both consisting of a first split plate and a second split plate, and the first split plate and the second split plate are connected by anchor nails; Furthermore, the first split plate and the second split plate adopt a modular length corrugated plate structure.

8. A construction method of a foldable integrated trench excavation support structure, characterized in that: include: S1: During processing, firstly, two ends of the transverse connecting member are connected to the second connecting portions on the first supporting structure plate and the second supporting structure plate through the first connecting portion, and firstly, the movable connecting member is passed through the first rotating hole and the second rotating hole and connected, so as to movably connect the first connecting portion and the second connecting portion; S2: During transportation, the support structure is rotated to a folded state by driving the first connection part and the second connection part to rotate, and the fastener is passed through the first fixing hole and the fourth fixing hole and fixed, or passed through the second fixing hole and the third fixing hole and fixed, so as to fix the support structure in the folded state; S3: During the rotation, only the movable connecting pieces in the first rotation hole and the second rotation hole are retained, and the first supporting structure plate and the second supporting structure plate are lifted by the lifting equipment and then rotated in parallel; S4: After the rotation is completed, two fasteners are respectively passed through the first fixing hole and the third fixing hole and fixed, and passed through the second fixing hole and the fourth fixing hole and fixed, so as to fix the support structure in the deployed state; S5: Before trench excavation, the support structure in the S4 state is placed near the trench. When the trench is excavated to a certain depth, the first support structure plate and the second support structure plate are hoisted as a whole into the trench by a lifting device, and the lower excavation is carried out in a supported state. After excavation to the structural construction surface, the structure construction in the communication trench is carried out. After backfilling, the support structure is hoisted to the next trench section for construction.

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