Auxiliary device for constructing underground diaphragm wall guide wall and construction method of auxiliary device

Abstract

The invention provides an auxiliary device for constructing a guide wall of an underground diaphragm wall and a construction method of the auxiliary device, the auxiliary device comprises a plurality of auxiliary units which are spliced and connected, and each auxiliary unit comprises an adjustable supporting frame unit and wall guide plate units which are symmetrically arranged on the two sides of the supporting frame unit; during guide wall construction, under the supporting effect of the adjustable supporting frame unit, one part of the guide wall plate unit is connected with an original guide wall steel bar structure to form one part of the guide wall steel bar structure, and the other part of the guide wall plate unit serves as a guide wall pouring formwork. When the auxiliary device is used for constructing the underground diaphragm wall guide wall, due to the fact that the auxiliary device is provided with the structure of the supporting frame and the structure of the guide wall pouring formwork, the procedures of formwork installation, formwork supporting frame welding and the like do not need to be conducted independently, the traditional guide wall construction mode is greatly simplified, the construction time is shortened, stability and universality are high, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of underground continuous wall construction, and in particular to an auxiliary device for constructing an underground continuous wall guide wall and a construction method thereof. Background Art

[0002] Guide wall, also known as guide wall, refers to the wall structure used for underground continuous wall support and lateral protection. In the construction of underground continuous wall excavation, in order to control the lateral deformation of the soil and stabilize the soil around the trench section, it is necessary to set up a guide wall to provide support and protection. This structure usually runs through the entire trench section or a certain range to reduce the displacement of the soil and ensure the construction safety of the underground continuous wall.

[0003] At present, the mainstream construction method of underground continuous wall guide walls at home and abroad is mainly cast-in-place concrete guide walls. During construction, the first steps required are formwork installation, formwork support frame welding, guide wall reinforcement binding, etc., to ensure that the guide wall has sufficient strength and density after casting.

[0004] Although the traditional cast-in-place guide wall can meet most of the current construction requirements, its shortcomings are also obvious: first, the construction process is relatively complicated and requires a lot of manpower, materials and equipment; second, the construction cost is high. The current wooden formwork and support frame can only be used once, resulting in serious waste of materials.

[0005] In view of the shortcomings of the conventional cast-in-place guide wall in the prior art, those skilled in the art have been looking for solutions. Summary of the invention

[0006] The purpose of the present invention is to provide an auxiliary device for constructing an underground continuous wall guide wall and a construction method thereof, so as to solve the problems of complex construction, high construction cost and waste of resources in the conventional cast-in-place guide wall using the prior art.

[0007] In order to solve the above-mentioned technical problems, the present invention provides an auxiliary device for constructing an underground continuous wall guide wall, and the auxiliary device for constructing an underground continuous wall guide wall comprises: a plurality of auxiliary units assembled and connected, each auxiliary unit comprises: an adjustable support frame unit and a guide wall plate unit symmetrically arranged on both sides of the support frame unit; during the guide wall construction, under the support of the adjustable support frame unit, a part of the guide wall plate unit is connected to the original guide wall steel bar structure to form a part of the guide wall steel bar structure, and the other part is used as a guide wall casting template.

[0008] Optionally, in the auxiliary device for constructing the underground continuous wall guide wall, each guide wall plate unit includes: a precast plate and a steel truss arranged on the side of the precast plate. During the guide wall construction, the steel truss is connected to the original guide wall steel structure to form a part of the guide wall steel structure, and the precast plate serves as a guide wall casting template.

[0009] Optionally, in the auxiliary device for constructing an underground continuous wall guide wall, the prefabricated panel includes: a main body, a plurality of extension ribs extending beyond the first side of the main body, and a plurality of extension rib slots reserved on the second side of the main body and adapted to the extension ribs; based on the plug-in adaptation of the extension ribs on adjacent prefabricated panels and the extension rib slots, the assembly of the two auxiliary units is achieved.

[0010] Optionally, in the auxiliary device for constructing an underground continuous wall guide wall, the adjustable support frame unit includes: two side rods and an active telescopic rod vertically arranged between the two side rods and two driven telescopic rods respectively located on both sides of the active telescopic rod; based on the adjustment of the length of the active telescopic rod, the two side rods located at both ends of the active telescopic rod are linked to move outward or inward, and the two side rods drive the two driven telescopic rods therein to follow the active telescopic rod to adjust the length, so that the two side rods are close to or away from the prefabricated panels of the adjacent side guide wall panel unit.

[0011] Optionally, in the auxiliary device for guiding the construction of an underground continuous wall, the active telescopic rod includes: a handwheel drive sleeve, a threaded rod and a rotating component, one end of the threaded rod is vertically fixed to a side rod, and the other end is sleeved in the handwheel drive sleeve, and the handwheel drive sleeve can rotate along the threaded rod; based on the cooperation between the rotating component located in the end of the handwheel drive sleeve and the fulcrum located on the other side rod, a connection between the handwheel drive sleeve and the other side rod is established.

[0012] Optionally, in the auxiliary device for constructing an underground continuous wall guide wall, the rotating component includes: a bearing and a fulcrum hole opened in the axial direction of the bearing, and the fulcrum hole is adapted to the fulcrum on the other side rod.

[0013] Optionally, in the auxiliary device for constructing an underground continuous wall guide wall, the driven telescopic rod includes: a sleeve, a tooth rod, a positioning hole and a positioning block, the first end of the sleeve is vertically fixed to a side rod, the second end of the sleeve is sleeved on the outside of a portion of the tooth rod, and can perform telescopic movement along the tooth rod; the other end of the tooth rod is vertically fixed to the other side rod; based on the positioning block, the positioning hole opened on the second end of the sleeve engages with the teeth on the tooth rod exposed outside the positioning hole to limit the relative position of the sleeve and the tooth rod.

[0014] Optionally, in the auxiliary device for guiding underground continuous walls, the tooth rod comprises a rod body and teeth arranged on one side of the rod body, and the teeth are arranged toward the pipe wall having positioning holes formed on the casing.

[0015] The present invention also provides a construction method for an auxiliary device for constructing an underground continuous wall guide wall, and the construction method for the auxiliary device for constructing an underground continuous wall guide wall comprises the following steps:

[0016] Arranging two wall guide plate units in the auxiliary unit at predetermined positions;

[0017] An adjustable support frame unit is arranged between two guide wall plate units, and the length of the adjustable support frame unit is adjusted so that a part of the guide wall plate units located on both sides thereof is connected with the original guide wall reinforcement structure to form a part of the guide wall reinforcement structure, and the other part is used as a guide wall casting template;

[0018] pouring concrete to form the underground continuous wall guide wall;

[0019] After the guide wall strength of the underground continuous wall reaches the standard, the length of the adjustable support frame unit is adjusted so that the adjustable support frame unit can be removed from between the two guide wall plate units.

[0020] In an auxiliary device for constructing an underground continuous wall guide wall and a construction method thereof provided by the present invention, the auxiliary device includes: a plurality of auxiliary units connected by assembly, each auxiliary unit includes: an adjustable support frame unit and a guide wall plate unit symmetrically arranged on both sides of the support frame unit; during the guide wall construction, under the support of the adjustable support frame unit, a part of the guide wall plate unit is connected to the original guide wall steel bar structure to form a part of the guide wall steel bar structure, and the other part is used as a guide wall casting template. The auxiliary device of the present invention is used to construct an underground continuous wall guide wall. Since the auxiliary device has the structure of both a support frame and a guide wall casting template, there is no need to perform separate template installation, template support frame welding and other processes, which greatly simplifies the traditional guide wall construction mode, shortens the construction time, has high stability and universality, and reduces the construction cost; in addition, the adjustable support frame unit is adjustable, can adapt to the construction of guide walls of various specifications, can be disassembled and recycled, and further reduces the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0022] Figure 1 A schematic diagram of the structure of a prefabricated panel in one embodiment of the present invention;

[0023] Figure 2 Another structural schematic diagram of a prefabricated panel in one embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of an adjustable support frame unit in one embodiment of the present invention;

[0025] Figure 4 It is a front view of an active telescopic rod in one embodiment of the present invention;

[0026] Figure 5A longitudinal cross-sectional view of the end of a hand wheel driven sleeve in one embodiment of the present invention;

[0027] Figure 6 is a transverse cross-sectional view of the end of a hand wheel driven sleeve in one embodiment of the present invention;

[0028] Figure 7 A longitudinal cross-sectional view of a handwheel driving sleeve at the handwheel position in one embodiment of the present invention;

[0029] Figure 8 It is a front view of a driven telescopic rod in one embodiment of the present invention;

[0030] Fig. 9 A partial enlarged view of a driven telescopic rod in one embodiment of the present invention;

[0031] Fig.10 It is a structural schematic diagram of an auxiliary device for constructing an underground continuous wall guide wall in one embodiment of the present invention;

[0032] Fig.11 It is a schematic diagram of an auxiliary device for constructing an underground continuous wall guide wall after installation at a construction site in one embodiment of the present invention;

[0033] Fig.12 It is a cross-sectional view after pouring concrete using an auxiliary device for constructing an underground continuous wall guide wall in one embodiment of the present invention.

[0034] In the figure:

[0035] 100-Wall Guide Unit:

[0036] 1-prefabricated plate; 20-main body; 2-extension rib; 4-extension rib slot; 3-reinforcement truss;

[0037] 200-Adjustable Support Frame Unit:

[0038] 16, 16'-side bars;

[0039] 17-active telescopic rod; 5-hand wheel drive sleeve; 10-internal thread; 6-threaded rod; 7-rotating part; 8-bearing; 9-fulcrum hole;

[0040] 11-driven telescopic rod; 19-sleeve; 12-tooth rod; 13-positioning hole; 15-positioning block;

[0041] 18-Original guide wall reinforcement structure. DETAILED DESCRIPTION

[0042] The following is a further detailed description of an auxiliary device for constructing an underground continuous wall guide wall and a construction method thereof proposed by the present invention in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0043] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0044] In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply 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 invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0047] Please refer to Figure 1 , Figure 2 , Figures 10 to 12The auxiliary device for constructing the underground continuous wall guide wall includes: a plurality of assembled auxiliary units, each of which includes: an adjustable support frame unit 200 and guide wall plate units 100 symmetrically arranged on both sides of the support frame unit; during the guide wall construction, under the support of the adjustable support frame unit 200, a part of the guide wall plate unit 100 is connected to the original guide wall steel bar structure 18 to form a part of the guide wall steel bar structure, and the other part is used as a guide wall casting template.

[0048] The auxiliary device of the present invention is used to construct underground continuous wall guide walls. Since the auxiliary device has the structure of both a support frame and a guide wall casting formwork, there is no need to perform separate processes such as formwork installation and formwork support frame welding, which greatly simplifies the traditional guide wall construction mode, shortens the construction time, has high stability and universality, and reduces construction costs. In addition, the adjustable support frame unit 200 is adjustable and can be adapted to guide wall construction of various specifications. It can be disassembled and recycled, which further reduces construction costs.

[0049] Please refer to Fig.11 and Fig.12 Each guide wall plate unit 100 includes: a precast plate 1 and a steel truss 3 arranged on the side of the precast plate 1. During the guide wall construction, the steel truss 3 is connected to the original guide wall steel structure to form a part of the guide wall steel structure. The precast plate 1 serves as a guide wall casting template.

[0050] like Figure 1 and Figure 2 As shown, the prefabricated panel 1 includes: a main body 20, a plurality of extension ribs 2 extending beyond the first side of the main body 20, and a plurality of extension rib slots reserved on the second side of the main body 20 and adapted to the extension ribs 2; based on the plug-in adaptation of the extension ribs 2 on the adjacent prefabricated panels 1 and the extension rib slots, the splicing of two prefabricated panels 1 is realized, and then the assembly of two auxiliary units is realized, and the entire assembly process does not require welding and is simple to operate. That is: based on the prefabricated panel assembly meeting the length of the guide wall casting template required for construction, and based on the steel bar truss 3 on the side of the prefabricated panel 1, the guide wall casting template is tightly connected with the guide wall formed by subsequent casting, the entire construction process is simple to operate, and the construction efficiency is improved.

[0051] Preferably, in order to facilitate the insertion of the prefabricated panels into the trench sections during construction, a slope is formed on the side of the prefabricated panels in contact with the soil, thereby effectively ensuring that the two prefabricated panels are in the same horizontal plane while increasing overall stability and facilitating subsequent connection.

[0052] Please refer to Figure 2As shown, the adjustable support frame unit 200 includes: two side rods 16, 16' and an active telescopic rod 17 vertically arranged between the two side rods 16, 16' and two driven telescopic rods 11 respectively located on both sides of the active telescopic rod 17; based on the adjustment of the length of the active telescopic rod 17, the two side rods 16, 16' located at both ends of the active telescopic rod 17 are linked to move outward or inward, and the two side rods 16, 16' drive the two driven telescopic rods 11 therein to follow the active telescopic rod 17 to adjust the length, so that the two side rods 16, 16' are close to or away from the prefabricated board 1 of the adjacent side guide wall panel unit 100, so that the three telescopic rods (one active telescopic rod 17 and two driven telescopic rods 11) can be extended and retracted at the same time, which is convenient for disassembly and assembly, and can meet the needs of guide wall construction of different widths.

[0053] like Figures 3 to 7 As shown, the active telescopic rod 17 includes: a handwheel drive sleeve 5, a threaded rod 6 and a rotating component 7, one end of the threaded rod 6 is vertically fixed to a side rod 16, and the other end is sleeved in the handwheel drive sleeve 5, and the handwheel drive sleeve can rotate along the threaded rod 6; based on the cooperation of the rotating component 7 located in the end of the handwheel drive sleeve 5 and the fulcrum located on the other side rod 16, the connection between the handwheel drive sleeve 5 and the other side rod 16 is established.

[0054] like Figure 7 As shown, not all inner walls of the handwheel drive sleeve 5 are provided with threads, only the inner wall at one end near the handwheel position is provided with an internal thread 10. The construction personnel rotate the handwheel drive sleeve 5 based on the handwheel to make it rotate along the threaded rod 6, converting the rotational motion into linear motion, thereby realizing the adjustment of the overall length of the active telescopic rod 17.

[0055] like Figure 5 and Figure 6 As shown, the rotating component 7 includes: a bearing 8 and a fulcrum hole 9 opened in the axial direction of the bearing 8, and the fulcrum hole is adapted to the fulcrum on the other side rod 16. That is, the right side of the active telescopic rod 17 (i.e., the end of the handwheel drive sleeve 5) is in contact with the side rod 16' but not fixedly connected, and the side rod 16' is provided with a fulcrum (protrusion) corresponding to the right end contact surface area of ​​the active telescopic rod 17, and the fulcrum is connected with the fulcrum hole 9 in the bearing 8 to realize the transmission of horizontal force. In other words, when the handwheel drive sleeve 5 rotates relative to the threaded rod 6, the active telescopic rod 17 moves around the fulcrum with the bearing 8, and its rotational movement does not affect the side rod 16'.

[0056] like Figure 8 and Fig. 9As shown, the driven telescopic rod 11 includes: a sleeve 19, a tooth rod 12, a positioning hole 13 and a positioning block 15. The first end of the sleeve 19 is vertically fixed to a side rod 16, and the second end of the sleeve 19 is sleeved on the outside of a portion of the tooth rod 12 and can perform telescopic movement along the tooth rod 12; the other end of the tooth rod 12 is vertically fixed to the other side rod 16'; based on the positioning block 15, the positioning hole 13 opened on the second end of the sleeve 19 is engaged with the teeth on the tooth rod 12 exposed outside the positioning hole 13 to limit the relative position of the sleeve 19 and the tooth rod 12.

[0057] Specifically, the tooth rod 12 includes a rod body and teeth arranged on one side of the rod body, and the teeth are arranged toward the tube wall of the sleeve 19 where the positioning hole 13 is opened.

[0058] Accordingly, this embodiment also provides a construction method for an auxiliary device for constructing an underground continuous wall guide wall. Figures 1 to 12 The construction method of the auxiliary device for constructing an underground continuous wall guide wall described in this embodiment is described in detail.

[0059] First, step S1 is performed to set two wall guide plate units 100 in the auxiliary unit at predetermined positions;

[0060] Next, step S2 is performed to set an adjustable support frame unit 200 between the two guide wall plate units 100, and adjust the length of the adjustable support frame unit 200 so that a part of the guide wall plate units 100 located on both sides thereof is connected to the original guide wall reinforcement structure to form a part of the guide wall reinforcement structure, and the other part is used as a guide wall casting template;

[0061] Next, step S3 is performed to pour concrete to form an underground continuous wall guide wall;

[0062] Next, step S4 is executed, and after the underground continuous wall guide wall strength reaches the standard, the length of the adjustable support frame unit 200 is adjusted so that the adjustable support frame unit 200 is removed from between the two guide wall plate units 100 .

[0063] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0064] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0065] The present invention has the following advantages:

[0066] 1) The auxiliary device of the present invention for constructing underground continuous wall guide wall has the structure of both support frame and guide wall casting template, and there is no need to carry out separate template installation, template support frame welding and other processes, which greatly simplifies the traditional guide wall construction mode, shortens the construction time, has high stability and universality, and reduces construction costs.

[0067] 2) The adjustable support frame unit has adjustable length, can be adapted to the construction of guide walls of various specifications, can be disassembled and recycled, reduces material waste, and further reduces construction costs.

[0068] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An auxiliary device for constructing an underground continuous wall guide wall, characterized in that: include: A plurality of auxiliary units are assembled and connected, each of which comprises: an adjustable support frame unit (200) and a guide wall plate unit (100) symmetrically arranged on both sides of the support frame unit; during the guide wall construction, under the support of the adjustable support frame unit (200), a part of the guide wall plate unit (100) is connected to the original guide wall steel bar structure (18) to form a part of the guide wall steel bar structure, and the other part is used as a guide wall casting template.

2. The auxiliary device for constructing underground continuous wall guide wall according to claim 1, characterized in that: Each guide wall plate unit (100) comprises: a precast plate (1) and a steel truss (3) arranged on the side of the precast plate (1); during the guide wall construction, the steel truss (3) is connected to the original guide wall steel bar structure to form a part of the guide wall steel bar structure, and the precast plate (1) serves as a guide wall casting template.

3. The auxiliary device for constructing underground continuous wall guide wall according to claim 2, characterized in that: The prefabricated panel (1) comprises: a main body (20), a plurality of extension ribs (2) extending beyond a first side of the main body (20), and a plurality of extension rib slots (4) reserved on a second side of the main body (20) and adapted to the extension ribs (2); based on the plug-in adaptation of the extension ribs (2) on adjacent prefabricated panels (1) and the extension rib slots (4), the assembly of two auxiliary units is achieved.

4. The auxiliary device for constructing underground continuous wall guide wall according to claim 1, characterized in that: The adjustable support frame unit (200) comprises: two side bars (16, 16'), an active telescopic rod (17) vertically arranged between the two side bars (16, 16'), and two driven telescopic rods (11) respectively located on both sides of the active telescopic rod (17); based on the adjustment of the length of the active telescopic rod (17), the two side bars (16, 16') located at both ends of the active telescopic rod (17) are linked to move outward or inward, and the two side bars (16, 16') drive the two driven telescopic rods (11) therein to follow the active telescopic rod (17) to adjust the length, so that the two side bars (16, 16') are close to or away from the prefabricated board (1) of the adjacent side guide plate unit (100).

5. The auxiliary device for constructing underground continuous wall guide wall according to claim 4, characterized in that: The active telescopic rod (17) comprises: a handwheel drive sleeve (5), a threaded rod (6) and a rotating component (7); one end of the threaded rod (6) is vertically fixed to a side rod (16), and the other end is sleeved in the handwheel drive sleeve (5), and the handwheel drive sleeve can rotate along the threaded rod (6); based on the cooperation between the rotating component (7) located in the end of the handwheel drive sleeve (5) and the fulcrum located on the other side rod (16), the connection between the handwheel drive sleeve (5) and the other side rod (16) is established.

6. The auxiliary device for constructing underground continuous wall guide wall according to claim 5, characterized in that: The rotating component (7) comprises: a bearing (8) and a fulcrum hole (9) opened in the axial direction of the bearing (8), wherein the fulcrum hole is adapted to be matched with the fulcrum on the other side rod (16).

7. The auxiliary device for constructing underground continuous wall guide wall according to claim 1, characterized in that: The driven telescopic rod (11) comprises: a sleeve (19), a toothed rod (12), a positioning hole (13) and a positioning block (15); the first end of the sleeve (19) is vertically fixed to a side rod (16); the second end of the sleeve (19) is sleeved on the outside of a portion of the toothed rod (12) and can perform telescopic movement along the toothed rod (12); the other end of the toothed rod (12) is vertically fixed to the other side rod (16'); the positioning block (15) is engaged with the teeth on the toothed rod (12) exposed outside the positioning hole (13) through the positioning hole (13) opened on the second end of the sleeve (19) to limit the relative position of the sleeve (19) and the toothed rod (12).

8. The auxiliary device for constructing underground continuous wall guide wall according to claim 7, characterized in that: The tooth rod (12) comprises a rod body and teeth arranged on one side of the rod body, wherein the teeth are arranged toward the tube wall of the sleeve (19) on which the positioning hole (13) is opened.

9. A construction method for the auxiliary device for constructing an underground continuous wall guide wall according to any one of claims 1 to 8, characterized in that: The following steps are involved: Arranging two wall guide plate units (100) in the auxiliary unit at predetermined positions; An adjustable support frame unit (200) is arranged between two guide wall plate units (100), and the length of the adjustable support frame unit (200) is adjusted so that a part of the guide wall plate units (100) located on both sides thereof is connected to the original guide wall reinforcement structure to form a part of the guide wall reinforcement structure, and the other part is used as a guide wall casting template; pouring concrete to form the underground continuous wall guide wall; After the guide wall strength of the underground continuous wall reaches the standard, the length of the adjustable support frame unit (200) is adjusted so that the adjustable support frame unit (200) is removed from between the two guide wall plate units (100).

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