An assembled underground continuous wall capable of being implemented at low headroom and a construction method thereof

Abstract

The present invention provides an assembled underground continuous wall that can be implemented at low headroom and a construction method thereof, comprising: a first I-shaped steel member and a second I-shaped steel member, wherein male joints are provided at both ends of the upper and lower flanges of the first I-shaped steel member; female joints are provided at both ends of the upper and lower flanges of the second I-shaped steel member; the first I-shaped steel member and the second I-shaped steel member are arranged adjacent to each other, the male joint on one side of the first I-shaped steel member is inserted into the female joint of the adjacent second I-shaped steel member in the vertical direction, and the first I-shaped steel member and the second I-shaped steel member are nested together. Compared with the cast-in-place underground continuous wall, the present invention has the advantages of assembly, low mud discharge, high work efficiency, and reliable quality; and the steel members used in the construction can be removed and recycled, which saves energy and reduces consumption; it can be implemented at low headroom, and provides an efficient enclosure structure form for developing underground space under existing buildings.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering, and in particular to an assembled underground continuous wall that can be implemented with low clearance and a construction method thereof, which is suitable for a foundation pit retaining structure system in the fields of underground space development, underground engineering, etc. Background Art

[0002] In recent years, the development and utilization of urban underground space in my country has entered a stage of rapid growth. The development and utilization of urban underground space has become an important measure to build a resource-saving and environmentally friendly society and realize ecological civilization, and the scale and difficulty of underground space development are increasing. With the continuous improvement of urban functional requirements, there are more and more urban renewal and renovation projects that develop underground space under existing protected buildings to improve building functions. The traditional cast-in-place underground continuous wall technology cannot meet the construction needs of low clearance conditions of existing buildings. Therefore, there is an urgent engineering demand for the research and development of new underground continuous wall technologies that can meet the low clearance implementation.

[0003] After searching, it was found that the Chinese patent with application number CN201811190402.7 discloses an underground continuous wall with assembled lattice steel TRD method and its construction method. The continuous wall includes a TRD method wall, and a lattice component is arranged inside the TRD method wall. The lattice component includes a narrow-wing I-beam and a straight-type steel sheet pile located outside the two flanges of the narrow-wing I-beam. Both ends of the straight-type steel sheet pile are provided with a locking mouth. The straight-type steel sheet piles outside the adjacent same-side flanges of the narrow-wing I-beam are connected by the locking mouth of the straight-type steel sheet piles.

[0004] However, in the above patent, the narrow-wing I-beam and the straight steel plate are arranged independently of each other, the overall rigidity is weakened, and the calculation of the bending rigidity of the combined structure is unclear, which is not convenient for engineering personnel to use; the I-beam and the steel plate need to be inserted twice, the construction process increases, the work efficiency is reduced, there is no measure for low clearance implementation, and the construction cannot ensure that the two fit together; the locking type at the end of the steel plate is not conducive to the nested construction of super-long steel. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide an assembled underground continuous wall that can be implemented with low clearance and a construction method thereof.

[0006] The first aspect of the present invention provides an assembled underground continuous wall that can be implemented with low headroom, comprising:

[0007] a first I-shaped steel member, wherein male joints are provided at both ends of the upper and lower flanges of the first I-shaped steel member;

[0008] a second I-shaped steel member, wherein the upper and lower flange ends of the second I-shaped steel member are provided with female joints;

[0009] The first I-shaped steel member is arranged adjacent to the second I-shaped steel member, the male joint on one side of the first I-shaped steel member is inserted into the female joint of the adjacent second I-shaped steel member along the vertical direction, and the first I-shaped steel member and the second I-shaped steel member are nested together.

[0010] Preferably, the assembled underground continuous wall that can be implemented with low headroom includes:

[0011] A plurality of first I-shaped steel members and a plurality of second I-shaped steel members, wherein the first I-shaped steel members and the second I-shaped steel members are arranged in sequence and spaced apart, and adjacent first I-shaped steel members and second I-shaped steel members are nested and assembled into a whole.

[0012] Preferably, the first I-shaped steel member is composed of a plurality of first segments spliced ​​together end to end; the first segment is composed of two first flange plates and a first web plate to form an I-shaped structure in cross section.

[0013] Preferably, the male joint is an I-shaped steel, which is arranged along the length direction of the end of the first flange plate, is orthogonal to and welded to the first flange plate, and forms a T-shaped structure in cross section with the first flange plate.

[0014] Preferably, the second I-shaped steel member is composed of a plurality of second segments spliced ​​together end to end; the second segment is composed of two second flange plates and a second web plate to form an I-shaped structure in cross section.

[0015] Preferably, the female joint is a C-shaped steel, which is arranged along the length direction of the end of the second flange plate, and the notch of the C-shaped steel faces away from the second flange plate, so that the male joint can be inserted into the C-shaped steel from the notch in the vertical direction; the C-shaped steel is orthogonal to the second flange plate and welded.

[0016] Preferably, the top sections of the first I-shaped steel member and the second I-shaped steel member are both provided with a crown beam area, and the flange length of the crown beam area is smaller than the flange length of the main body of the first I-shaped steel member and the second I-shaped steel member, so that the flanges of the top sections of the first I-shaped steel member and the second I-shaped steel member are arranged at intervals to meet the requirements for the setting of stirrups of the crown beam.

[0017] Preferably, the first I-shaped steel member and the second I-shaped steel member are arranged in a cement-soil mixing wall.

[0018] The second aspect of the present invention provides a construction method of the above-mentioned assembled underground continuous wall that can be implemented at low headroom, comprising:

[0019] Prepare the first type I steel members and the second type I steel members that meet the clearance and force requirements of the construction site;

[0020] Construct cement-soil mixing walls of equal thickness in low headroom working areas;

[0021] A first I-shaped steel member is hoisted and inserted into the cement-soil mixing wall, and then a second I-shaped steel member is hoisted into the cement-soil mixing wall and is adjacent to the first I-shaped steel member, and the female joint on one side of the second I-shaped steel member is nested with the male joint on one side of the first I-shaped steel member, and then another first I-shaped steel member is hoisted to the other side of the second I-shaped steel member, and the male joint of the first I-shaped steel member is nested with the female joint on the other side of the second I-shaped steel member; the first I-shaped steel member and the second I-shaped steel member are arranged in sequence at intervals, and the adjacent sides are connected by nesting female joints and male joints to form an assembled underground continuous wall.

[0022] Preferably, the construction of cement soil mixing wall of equal thickness in the low-headroom operation area is carried out by using channel-type cutting cement soil mixing wall equipment or milling cement soil mixing wall equipment that meets the requirements of low-headroom operation.

[0023] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0024] The above-mentioned assembled underground continuous wall of the present invention is assembled by a first I-type steel member and a second I-type steel member which are nested in sequence, and the construction process is simple, efficient and fast; the first I-type steel member and the second I-type steel member are nested and connected together by a female and a male joint, and the guiding property is good. The nested assembly method is adopted, so that the connection method of adjacent steel members is firm, which is convenient for ultra-deep steel construction, and the continuous wall formed after nesting has high rigidity, clear force calculation, and is easy for engineering personnel to design and apply; the assembled underground continuous wall can solve the problems of large mud discharge, low construction efficiency, and difficult quality control existing in cast-in-place concrete underground continuous walls; compared with cast-in-place underground continuous walls, it has the characteristics of assembly, low mud discharge, high efficiency, and reliable quality; the steel members can be pulled out and recycled, saving energy and reducing consumption; it can also be used as a permanent basement structure exterior wall.

[0025] The above-mentioned assembled underground continuous wall of the present invention inserts the above-mentioned first I-type steel member and the second I-type steel member into a cement-soil mixing wall of equal thickness. The mutually nested steel members have high rigidity, and the steel members are wrapped by cement soil, with good seepage-proof performance, which can meet the requirements of water-proofing and earth-retaining for large-depth foundation pit engineering.

[0026] The construction method of the above-mentioned prefabricated underground continuous wall of the present invention, combined with the channel-type cutting cement soil mixing wall technology or the milling cement soil mixing wall technology that can operate at low clearance, can realize the efficient implementation of large-depth underground continuous walls under low clearance working conditions through the assembly of steel components, thereby providing an effective enclosure structure form for the development of underground space under existing buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 It is a cross-sectional schematic diagram of an assembled underground continuous wall that can be implemented with low headroom in a preferred embodiment of the present invention;

[0029] Figure 2 It is a three-dimensional schematic diagram of an assembled underground continuous wall that can be implemented with low headroom in a preferred embodiment of the present invention;

[0030] Figure 3 is a schematic cross-sectional view of a first I-shaped steel member according to a preferred embodiment of the present invention;

[0031] Figure 4 is a schematic cross-sectional view of a second I-shaped steel member according to a preferred embodiment of the present invention;

[0032] Figure 5 It is a top view of the splicing method of adjacent first sections of a first I-shaped steel member according to a preferred embodiment of the present invention;

[0033] Figure 6 It is a side view of the splicing method of adjacent first sections of a first I-shaped steel member according to a preferred embodiment of the present invention;

[0034] The marks in the figure are respectively represented as: 1 is the first I-type steel member, 2 is the second I-type steel member, 3 is the crown beam area, 4 is the cement-soil mixing wall, 5 is the web splicing plywood, 6 is the flange outer splicing plywood, 7 is the flange inner splicing plywood, 8 is the first bolt, 9 is the second bolt, 11 is the first flange plate, 12 is the first web plate, 13 is the male joint, 21 is the second flange plate, 22 is the second web plate, 23 is the female joint, 1a is the first segment of the uppermost section, 1b is the first segment of the lower section, 2a is the second segment of the uppermost section, and 2b is the second segment of the lower section. DETAILED DESCRIPTION

[0035] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0036] Reference Figure 1 The figure shows a cross-sectional schematic diagram of a prefabricated underground continuous wall that can be implemented at low headroom in a preferred embodiment of the present invention, which can be used as an energy-saving and efficient prefabricated enclosure structure for deep and large foundation pit projects, and is particularly suitable for being a form of foundation pit enclosure structure that can be implemented at low headroom for developing underground space under existing buildings. The figure includes a first I-shaped steel member 1 and a second I-shaped steel member 2, which are inserted into a cement soil mixing wall 4, and the first I-shaped steel member 1 and the second I-shaped steel member 2 are sequentially arranged adjacent to each other and assembled as a whole.

[0037] Among them, male joints 13 are provided at both ends of the upper and lower flanges of the first I-shaped steel member 1. Female joints 23 are provided at both ends of the upper and lower flanges of the second I-shaped steel member 2. The male joint 13 on one side of the first I-shaped steel member 1 is inserted into the female joint 23 of the adjacent second I-shaped steel member 2 in the vertical direction, and the first I-shaped steel member 1 and the second I-shaped steel member 2 are nested together.

[0038] In other preferred embodiments, the assembled underground continuous wall that can be implemented with low clearance includes: a plurality of first I-shaped steel members 1 and a plurality of second I-shaped steel members 2, wherein the first I-shaped steel members 1 and the second I-shaped steel members 2 are arranged in sequence and spaced apart, and the adjacent first I-shaped steel members 1 and the second I-shaped steel members 2 are nested and assembled into a whole. Figure 2 As shown, the number of the first I-shaped steel member 1 and the number of the second I-shaped steel member 2 are both two. The upper and lower male joints 13 on one side of the first I-shaped steel member 1 are respectively inserted into the two female joints 23 on the same side of the adjacent second I-shaped steel member 2, and then another first I-shaped steel member 1 is arranged at the adjacent position on the other side of the above-mentioned second I-shaped steel member 2, and the upper and lower male joints 13 on one side of the first I-shaped steel member 1 are respectively inserted into the two female joints 23 on the other side of the above-mentioned second I-shaped steel member 2, and then the two male joints 13 on the other side of the first I-shaped steel member 1 are inserted into the two female joints 23 of another second I-shaped steel member 2, so that the above-mentioned two first I-shaped steel members 1 and the two second I-shaped steel members 2 are assembled into a whole.

[0039] In other preferred embodiments, the first I-shaped steel member 1 is composed of a plurality of first segments spliced ​​end to end; Figure 2As shown, the first I-shaped steel member 1 is formed by splicing the tail end of the uppermost first segment 1a and the lower first segment 1b into one piece. The first segment is processed into an I-shaped integrated structure with two first flange plates 11 and a first web plate 12, wherein the two first flange plates 11 are respectively connected to the two ends of the first web plate 12. As a preferred method, the two first segments are mechanically connected by bolts or screws. Specifically: refer to Figure 5 , Figure 6 As shown, an outer flange splicing plate 6 and an inner flange splicing plate 7 are provided at the joint of the first flange plates 11 of the two first sections. The outer flange splicing plate 6 and the inner flange splicing plate 7 are respectively located at the inner side and the outer side of the joint of the first flange plates 11. A plurality of first bolts 8 sequentially pass through the outer flange splicing plate 6, the first flange plate 11, and the inner flange splicing plate 7 to connect the three as one. Two web splicing plates 5 are provided at the joint of the first web plates 12 of the two first sections. The two web splicing plates 5 are respectively clamped on both sides of the first web plate 12; a plurality of second bolts 9 sequentially pass through one of the web splicing plates 5, the first web plate 12, and the other web splicing plate 5 to connect the three as one. In the specific implementation, the specifications of the outer flange splicing plate 6, the inner flange splicing plate 7, and the web splicing plate 5 and the specifications of the first bolts 8 and the second bolts 9 are determined according to the strong connection requirements of the steel section. The number of the first sections of the first I-shaped steel member 1 can be arranged according to the clearance requirements of the construction site. During the specific construction, the first section of the lower section can be hoisted to the designated position first, and then the first section of the upper section can be hoisted above the first section of the lower section, and the lower end of the hoisted first section of the upper section can be aligned with the upper end of the first section of the lower section and then spliced.

[0040] The thickness of the two first flange plates 11 and the first web plate 12 can be designed according to the engineering requirements. Take an application project as an example: the I-beam (Q235) is 900mm high and 700mm wide; the first web plate 12 is 16mm thick, and the first flange plate 11 is 28mm thick. Its bending stiffness is equivalent to that of a 980mm high concrete underground continuous wall (C30).

[0041] In other preferred embodiments, the male joint 13 is a straight steel. The straight steel is arranged along the length direction of the end of the first flange plate 11. The straight steel is orthogonal to the first flange plate 11 and welded. The straight steel and the first flange plate 11 form a T-shaped structure in cross section. In the process of connecting the first I-shaped steel member 1 and the second I-shaped steel member 2, the male joint 13 plays a guiding function to ensure the implementation of the ultra-deep steel wall. In specific implementation, a straight steel with a full length is welded at the ends of the two first flange plates 11 of the first I-shaped steel member 1. Refer to Figure 3 As shown, four straight-line steels are orthogonally welded to the first flange plate 11 to form four male joints 13 .

[0042] In other preferred embodiments, the second I-shaped steel member 2 is composed of a plurality of second segments spliced ​​end to end; Figure 2 As shown, the second I-shaped steel member is formed by splicing the tail end of the second segment 22a of the uppermost section and the head end of the second segment 22b of the lower section into one piece. The second segment is processed into an I-shaped integrated structure with two second flange plates 21 and a second web plate 22, wherein the two second flange plates 21 are respectively connected to the two ends of the second web plate 22. As a preferred method, the connection method of the two second segments can be carried out by the splicing method of the first segments mentioned above. For specific connection methods, please refer to Figure 5 , Figure 6 The specifications of the second flange plate 21 and the second web plate 22 of the second I-shaped steel member 2 may be the same as those of the first I-shaped steel member 1 or may be different.

[0043] In other preferred embodiments, the female joint 23 is a C-shaped steel, which is arranged along the length direction of the end of the second flange plate 21, and the notch of the C-shaped steel faces away from the second flange plate 21, so that the male joint 13 can be inserted into the C-shaped steel from the notch in the vertical direction; the C-shaped steel is orthogonal to the second flange plate 21 and welded. In specific implementation, the full-length C-shaped steel is welded at the ends of the two second flange plates 21 of the second I-shaped steel member 2. Figure 4 As shown, four C-shaped steels orthogonal to the second flange plate 21 are welded to form four female joints 23 .

[0044] In the above embodiment, the specifications of the I-shaped steel and the C-shaped steel can be determined according to the design requirements, and ensure that the male connector 13 can be inserted into the female connector 23 in the vertical direction, and can be firmly nested together without separation. Take an application project as an example: the specifications of the male connector 13 are 76mm (width) × 28mm (thickness); the female connector 23 is processed from a round steel pipe with a tongue-and-groove opening, with an inner diameter of 106mm, an outer diameter of 130mm, a wall thickness of 12mm, and an opening size of 48mm.

[0045] In other preferred embodiments, the foundation pit retaining structure generally needs to be provided with supporting crown beams and surrounding purlins, referring to Figure 2 As shown, the top sections of the first I-shaped steel member 1 and the second I-shaped steel member 2 need to be provided with a crown beam area 3, and the flange plate of the crown beam area 3 is processed into a flange with a reduced length, that is, the flange length of the crown beam area 3 is less than the flange length of the first I-shaped steel member 1 and the second I-shaped steel member 2. The flanges 11 in this range are arranged at intervals to meet the requirements for the setting of the stirrups of the crown beam. For the area where the surrounding purlin needs to be set, it can be achieved by welding hangers or bolts on the steel member on site.

[0046] The prefabricated underground continuous wall described in the above embodiment can be used only as a temporary retaining structure during the foundation pit implementation stage. After the underground structure is completed, the above steel components can be removed, recycled and reused. The two walls can also be combined into one as a permanent basement structure exterior wall. When used as a permanent underground wall, the bolts and other components that need to be reserved on the steel can be determined according to the design requirements.

[0047] Another embodiment provides a construction method of an assembled underground continuous wall that can be implemented at a low headroom, which is used to construct and form the assembled underground continuous wall that can be implemented at a low headroom. The construction method may include the following steps:

[0048] S1: Prepare a plurality of first I-shaped steel members 1 and a plurality of second I-shaped steel members 2 that meet the clearance and force requirements of the construction site.

[0049] S2: Construct cement soil mixing wall 4 of equal thickness in low clearance working area.

[0050] S3: hoist one of the first I-shaped steel members 1 and insert it into the cement-soil mixing wall 4, then hoist a second I-shaped steel member 2 into the cement-soil mixing wall 4 and make it adjacent to the first I-shaped steel member 1, nest the female joint 23 on one side of the second I-shaped steel member 2 and the male joint 13 of the adjacent first I-shaped steel member 1 together, then hoist another first I-shaped steel member to the other side of the second I-shaped steel member, and nest the male joint of the first I-shaped steel member and the female joint on the other side of the second I-shaped steel member together; arrange the first I-shaped steel member and the second I-shaped steel member in sequence, and connect the adjacent sides through the nested female joints and male joints to form an assembled underground continuous wall.

[0051] In other preferred embodiments, a cement soil mixing wall 4 of equal thickness is constructed in a low clearance operation area, and the cement soil mixing wall 4 can be formed by a channel-type cutting cement soil mixing wall 4 device or a milling cement soil mixing wall 4 device. Both the channel-type cutting cement soil mixing wall 4 device and the suspended milling cement soil mixing wall 4 device can operate at a clearance of 7m. The cement soil mixing wall 4 constructed by these two types of equipment is of equal thickness and continuous, and the cement soil wall has good mixing uniformity. The maximum depth of the wall can reach 80m, and the verticality can reach 1 / 500. It can be applied to various soft and hard strata, and has little impact on the construction environment. The steel structure is inserted into the cement soil wall and is wrapped by cement soil with a certain strength. It has good seepage resistance and can meet the requirements of water-proof and earth-retaining for large-depth foundation pit engineering under low clearance conditions.

[0052] In summary, the prefabricated underground continuous wall and its construction method that can be implemented with low clearance in the above-mentioned embodiments have the characteristics of assembly, low mud discharge, high work efficiency, and reliable quality compared to the cast-in-place underground continuous wall; the steel components can be removed and recycled to save energy and reduce consumption; they can also be used as the exterior wall of a permanent basement structure; at the same time, they can be implemented with low clearance, providing an efficient enclosure structure form for the development of underground space under existing buildings.

[0053] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A construction method for an assembled underground continuous wall that can be implemented at low headroom, characterized in that: The assembled underground continuous wall comprises: a first I-shaped steel member, wherein male joints are provided at both ends of the upper and lower flanges of the first I-shaped steel member; a second I-shaped steel member, wherein the upper and lower flange ends of the second I-shaped steel member are provided with female joints; The first I-shaped steel member is arranged adjacent to the second I-shaped steel member, the male joint on one side of the first I-shaped steel member is inserted into the female joint of the adjacent second I-shaped steel member in the vertical direction, and the first I-shaped steel member and the second I-shaped steel member are nested together; The first I-shaped steel member is composed of a plurality of first segments spliced ​​together end to end; the first segment is composed of two first flange plates and one first web plate to form an I-shaped structure in cross section; The male joint is a straight steel, the straight steel is arranged along the length direction of the end of the first flange plate, the straight steel is orthogonal to the first flange plate and welded, and the straight steel and the first flange plate form a T-shaped structure in cross section; The second I-shaped steel member is composed of a plurality of second segments spliced ​​together end to end; the second segment is composed of two second flange plates and a second web plate to form an I-shaped structure in cross section; The female joint is a C-shaped steel, which is arranged along the length direction of the end of the second flange plate, and the notch of the C-shaped steel faces away from the second flange plate, so that the male joint can be inserted into the C-shaped steel from the notch along the vertical direction; the C-shaped steel is orthogonal to the second flange plate and is welded; The top sections of the first I-shaped steel member and the second I-shaped steel member are both provided with a crown beam area, and the flange length of the crown beam area is less than the flange length of the main body of the first I-shaped steel member and the second I-shaped steel member, so that the flanges of the top sections of the first I-shaped steel member and the second I-shaped steel member are arranged at intervals to meet the requirements for the setting of stirrups of the crown beam; The construction method comprises: Prepare a number of first type I steel members and a number of second type I steel members that meet the clearance and force requirements of the construction site; Construct cement-soil mixing walls of equal thickness in low headroom working areas; A first I-shaped steel member is hoisted and inserted into the cement-soil mixing wall, and then a second I-shaped steel member is hoisted into the cement-soil mixing wall and is adjacent to the first I-shaped steel member, and the female joint on one side of the second I-shaped steel member is nested with the male joint on one side of the first I-shaped steel member, and then another first I-shaped steel member is hoisted to the other side of the second I-shaped steel member, and the male joint of the first I-shaped steel member is nested with the female joint on the other side of the second I-shaped steel member; the first I-shaped steel member and the second I-shaped steel member are arranged in sequence at intervals, and the adjacent sides are connected by nesting female joints and male joints to form an assembled underground continuous wall.

2. The construction method of the assembled underground continuous wall that can be implemented at low headroom according to claim 1 is characterized in that: include: A plurality of first I-shaped steel members and a plurality of second I-shaped steel members, wherein the first I-shaped steel members and the second I-shaped steel members are arranged in sequence and spaced apart, and adjacent first I-shaped steel members and second I-shaped steel members are nested and assembled into a whole.

3. The construction method of an assembled underground continuous wall that can be implemented at low headroom according to any one of claims 1 to 2, characterized in that: The first I-shaped steel member and the second I-shaped steel member are arranged in a cement-soil mixing wall.

4. The construction method of an assembled underground continuous wall that can be implemented at low headroom according to any one of claims 1 to 2, characterized in that: The construction of equal thickness cement soil mixing wall in the low clearance operation area: wherein, channel-type cutting cement soil mixing wall equipment or milling cement soil mixing wall equipment that meets the requirements of low clearance operation is used for construction.

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