A construction method for low clearance underground continuous wall

Abstract

The present invention provides a method for constructing a low-headroom underground continuous wall. The method for constructing a low-headroom underground continuous wall comprises the following steps: a plurality of first inclined holes and a plurality of second inclined holes are drilled downward on the upper surfaces of both sides of the guide wall groove; the first inclined holes and the second inclined holes have opposite inclination directions; inclined steel bars are inserted into the first inclined holes and the second inclined holes, and the upper ends of the inclined steel bars extend upward out of the first inclined holes and the second inclined holes; the horizontal section of the guide wall steel bar cage is fixedly connected to the upper end of the inclined steel bars. The first inclined holes and the second inclined holes are arranged in opposite inclination directions, so that the two inclined steel bars located in the first inclined holes and the second inclined holes have opposite inclination directions. Therefore, the inclined directions of the inclined steel bars in the first inclined holes and the second inclined holes are also opposite. The horizontal section of the guide wall can always maintain a horizontal state under the action of the inclined steel bars with opposite inclination directions, thereby increasing the safety of subsequent continuous wall construction.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a low-clearance underground continuous wall construction method. Background Art

[0002] In order to ease urban traffic pressure and save urban land, underground continuous walls have become a widely used support method in the construction of subway station enclosure structures. As one of the main means to solve urban traffic problems, subway projects mainly pass through urban built-up areas and central areas. The conditions around subway construction sites are generally complex, and there will be more and more subway projects under close distance and low clearance conditions.

[0003] As a widely used support method, the construction process of underground continuous wall is greatly affected by the surrounding environment. When using conventional equipment and processes, the construction of underground continuous wall has high requirements for the working space, especially under low clearance and close distance conditions.

[0004] In the existing underground continuous wall construction, different geological conditions often have different impacts in the construction area. In some cases where the geological stability is poor, if the continuous wall trench wall is not reinforced, it may have adverse effects in subsequent construction, such as continuous wall trench wall collapse. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a low-headroom underground continuous wall construction method that overcomes the above problems or at least partially solves the above problems, which can solve the problem that the wall of the existing continuous wall construction is poor in stability and prone to collapse, thereby achieving the effect of improving the stability of the continuous wall construction.

[0006] Specifically, the present invention provides a low-headroom underground continuous wall construction method, which is characterized by comprising: Construction inspection, obtaining construction location; Excavate the foundation pit at the construction location to form the guide wall trench; A plurality of first oblique holes and a plurality of second oblique holes are drilled downward on the upper surfaces of both sides of the guide wall groove; the first oblique holes and the second oblique holes have opposite inclination directions; L-shaped guide wall reinforcement cages are arranged on both sides of the guide wall groove; Inserting the inclined steel bars into the first inclined hole and the second inclined hole, and the upper ends of the inclined steel bars extend upward out of the first inclined hole and the second inclined hole; The horizontal section of the guide wall reinforcement cage is fixedly connected to the upper end of the inclined reinforcement.

[0007] Optionally, in the step of drilling a plurality of first oblique holes and a plurality of second oblique holes downwardly on the upper surfaces of both sides of the guide wall groove, the step further includes: The first inclined hole is drilled obliquely from the upper surface of the guide wall groove into the guide wall groove; The inclined steel bar located in the first inclined hole is a first inclined steel bar; the lower end of the first inclined steel bar extends outward from the lower end of the first inclined hole to the vertical section of the guide wall steel bar cage and is located in the guide wall groove; An oblique-stayed hook is arranged at the lower end of the first oblique-stayed steel bar.

[0008] Optionally, the step after installing the diagonal hook at the lower end of the first diagonal steel bar includes: The lower end of the first inclined steel bar is fixedly connected to the vertical section of the guide wall steel cage.

[0009] Optionally, the second oblique hole includes a first section and a second section; The first section is located at the upper end of the second section; the diameter of the second section is greater than the diameter of the first section.

[0010] Optionally, after the step of fixedly connecting the horizontal section of the guide wall reinforcement cage to the upper end of the inclined reinforcement, the step further includes: pouring concrete into the second inclined hole; pouring concrete on the vertical section of the guide wall reinforcement cage; pouring concrete into the first inclined hole; Pour concrete on the horizontal section of the guide wall reinforcement cage.

[0011] Optionally, after pouring concrete on the horizontal section of the guide wall reinforcement cage, the step further includes: After the strength of the guide wall reaches a preset strength, digging downward on the basis of the guide wall groove to form a continuous wall groove; The continuous wall reinforcement cage is placed downwardly in the continuous wall groove, and the preset position of the continuous wall reinforcement cage is connected to the inclined hook.

[0012] Optionally, the angle between the first oblique hole and the second oblique hole is 20-60 degrees.

[0013] Optionally, the plurality of first oblique holes are divided into a plurality of oblique hole groups; Each of the inclined hole groups includes a plurality of first inclined holes; the plurality of first inclined holes in each of the inclined hole groups are evenly distributed along the length direction of the guide wall groove; The plurality of inclined hole groups are evenly distributed along the vertical direction.

[0014] In the low clearance underground continuous wall construction method of the present invention, a plurality of first inclined holes and a plurality of second inclined holes are provided, and inclined steel bars are provided in both the first inclined holes and the second inclined holes. The upper end of the inclined steel bar is fixedly connected to the horizontal section of the guide wall steel cage, so that the inclined steel bar is a part of the guide wall steel cage. The provision of a plurality of inclined steel bars can increase the friction between the guide wall steel cage and the soil layer of the guide wall groove wall, thereby increasing the tensioning force of the inclined steel bars on the guide wall steel cage, thereby effectively increasing the stability of the guide wall steel cage, thereby achieving the stability of the subsequent continuous wall steel cage connection.

[0015] Furthermore, the first inclined hole and the second inclined hole are arranged in opposite directions, so that the two inclined steel bars located in the first inclined hole and the second inclined hole can have opposite directions of inclination. Therefore, the inclined directions of the inclined steel bars in the first inclined hole and the second inclined hole are also opposite. When the guide wall formed by the guide wall steel bar cage is subjected to downward tension or the guide wall is subjected to external forces in other directions, the two inclined steel bars with opposite inclination directions can generate two opposite directions of resistance to prevent deformation, thereby effectively preventing the guide wall of the horizontal section corresponding to the guide wall steel bar cage from being lifted to one side. In other words, the horizontal section of the guide wall can always maintain a horizontal state under the action of the inclined steel bars with opposite inclination directions, thereby increasing the stability and safety of subsequent continuous wall construction.

[0016] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 is a schematic flow chart of a low headroom underground continuous wall construction method according to an embodiment of the present invention; Figure 2 is a schematic flow chart of a low headroom underground continuous wall construction method according to an embodiment of the present invention; Figure 3 is a schematic flow chart of a low headroom underground continuous wall construction method according to an embodiment of the present invention; Figure 4 is a schematic structural diagram of a guide wall reinforcement frame in a low clearance underground continuous wall construction method according to an embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0018] In the figure: 100, guide wall groove; 200, guide wall steel bar cage; 300, continuous wall steel bar cage; 400, guide wall; 500, first inclined hole; 600, second inclined hole; 700, inclined steel bar; 710, first inclined steel bar; 720, inclined hook; 730, second inclined steel bar. DETAILED DESCRIPTION

[0019] Refer to the following Figures 1 to 5 To describe the low-clearance underground continuous wall construction method of an embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0020] Unless otherwise clearly defined and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0021] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0022] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0023] Figure 1 This is a schematic structural diagram of the low headroom underground continuous wall construction method. Figure 1 As shown, and refer to Figures 2 to 5 The embodiment of the present invention provides a low-headroom underground continuous wall construction method, and the low-headroom underground continuous wall construction method includes: S100, construction detection, obtaining the construction location; S200, excavating a foundation pit at the construction location to form a guide wall groove 100; S300, a plurality of first oblique holes 500 and a plurality of second oblique holes 600 are drilled downward on the upper surfaces of both sides of the guide wall groove 100; the first oblique holes 500 and the second oblique holes 600 are inclined in opposite directions; S400, L-shaped guide wall steel cages 200 are respectively arranged on both sides of the guide wall groove 100; S500, inserting the oblique steel bar 700 into the first oblique hole 500 and the second oblique hole 600, and the upper ends of the oblique steel bar 700 extend upward out of the first oblique hole 500 and the second oblique hole 600; S600, the horizontal section of the guide wall reinforcement cage 200 is fixedly connected to the upper end of the inclined reinforcement 700.

[0024] Specifically, the construction inspection includes the early construction preparation and the layout of the inspection position, so as to obtain the construction position. Further, since the height of the guide wall 400 after pouring concrete needs to be 2.2m, the depth of the guide wall groove 100 is at least 2.2m. Further, the drilling directions of the first inclined hole and the second inclined hole 600 are both processed by inclined drilling.

[0025] Specifically, the plurality of first inclined holes 500 and the plurality of second inclined holes 600 are both provided with inclined steel bars 700, and the upper ends of the inclined steel bars 700 are fixedly connected to the horizontal sections of the guide wall steel bar cage 200, so that the inclined steel bars 700 are part of the guide wall steel bar cage 200. The provision of the plurality of inclined steel bars can increase the friction between the guide wall steel bar cage 200 and the wall of the guide wall groove 100, thereby effectively improving the stability of the provision of the guide wall steel bar cage 200, and further achieving the stability of the connection of the subsequent continuous wall steel bar cage 300.

[0026] Furthermore, the first inclined hole 500 and the second inclined hole 600 are arranged in opposite directions, so that the two inclined steel bars 700 located in the first inclined hole 500 and the second inclined hole 600 are inclined in opposite directions. Therefore, the inclined directions of the inclined steel bars 700 in the first inclined hole 500 and the second inclined hole 600 are also opposite. When the guide wall 400 formed by the guide wall steel bar cage 200 is subjected to downward tension or the guide wall 400 is subjected to external forces in other directions, the two inclined steel bars 700 with opposite inclined directions can generate two opposite directions of resistance to deformation, thereby effectively preventing the guide wall 400 of the horizontal section corresponding to the guide wall steel bar cage 200 from being lifted to one side. That is to say, the horizontal section of the guide wall 400 can be kept in a horizontal state under the action of the inclined steel bars 700 with opposite inclined directions, thereby increasing the safety of subsequent continuous wall construction.

[0027] In some embodiments of the present invention, Figure 2 , Figure 4 and Figure 5 As shown, in the step of drilling a plurality of first oblique holes 500 and a plurality of second oblique holes 600 downwardly on the upper surfaces of both sides of the guide wall groove 100, the step further includes: S510, a first oblique hole 500 is drilled obliquely from the upper surface of the guide wall groove 100 into the guide wall groove 100; S520, the inclined steel bar 700 located in the first inclined hole is the first inclined steel bar 710; the lower end of the first inclined steel bar 710 extends outward from the lower end of the first inclined hole 500 to the vertical section of the guide wall steel bar cage 200, and is located in the guide wall groove 100; S530 , installing an oblique-stayed hook 720 at the lower end of the first oblique-stayed steel bar 710 .

[0028] Specifically, the first inclined hole 500 is a through hole, and both upper and lower ends thereof are open, so that the lower end of the first inclined steel bar 710 can extend from the lower end of the first inclined hole 500 into the guide wall groove 100. Further, the upper end of the opposite second inclined hole 600 is located on the side of the first inclined hole 500 close to the upper end close to the groove wall of the guide wall groove 100, and the second inclined hole 600 is first drilled downward away from the side of the groove wall of the guide wall groove 100, thereby forming a state in which the first inclined hole 500 and the second inclined hole 600 have opposite inclination directions.

[0029] Furthermore, the inclined hook 720 is formed by bending the lower end of the first inclined steel bar 710 located in the guide wall groove 100, thereby increasing the stability of the inclined hook 720, thereby providing a stable installation position for the subsequent continuous wall steel bar cage 300. Furthermore, the inclined steel bar 700 located in the second inclined hole 600 is a second inclined steel bar 730.

[0030] In some embodiments of the present invention, Figure 5 As shown, the steps after installing the inclined hook 720 at the lower end of the first inclined steel bar 710 include: S531, fix the lower end of the first inclined steel bar 710 to the vertical section of the guide wall steel bar cage 200.

[0031] Specifically, the lower end of the first inclined steel bar 710 is fixedly connected to the steel bars of the numerical section of the guide wall steel bar cage 200, thereby increasing the tightness between the inclined hook 720 and the guide wall steel bar cage 200, making the inclined hook 720 a part of the guide wall steel bar cage 200, thereby further increasing the stability of the inclined hook 720.

[0032] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 5 As shown, the second oblique hole includes a first section and a second section, the first section is located at the upper end of the second section, and the diameter of the second section is greater than the diameter of the first section.

[0033] After the horizontal section of the guide wall reinforcement cage 200 is fixedly connected to the upper end of the inclined reinforcement 700, the steps further include: S610, pouring concrete into the second inclined hole 600; S620, pouring concrete on the vertical section of the guide wall reinforcement cage 200; S630, pouring concrete into the first inclined hole 500; S640, pouring concrete on the horizontal section of the guide wall reinforcement cage 200.

[0034] Specifically, after the guide wall steel cage 200 is connected to the diagonal steel bar 700, concrete is poured into the second diagonal hole 600. Since the second diagonal hole 600 is not a through hole, the diagonal steel bar 700 in the second diagonal hole 600 stabilizes the guide wall steel cage 200. Furthermore, since the diameter of the second section of the second diagonal hole 600 is greater than the diameter of the first section, the diameter of the concrete column formed in the second diagonal hole 600 is also greater at the lower end than at the upper end, so that the contact area between the lower end of the concrete column and the soil layer is greater than the contact area between the upper end and the soil layer, thereby increasing the tension of the diagonal steel bar 700 in the second diagonal hole 600 on the guide wall 400.

[0035] Furthermore, the sequence of first pouring concrete in the vertical section of the guide wall steel cage 200 and then pouring concrete into the first inclined hole 500 can block the lower end opening of the first inclined hole 500 after pouring concrete in the vertical section of the guide wall steel cage 200, thereby facilitating the subsequent pouring of concrete into the first inclined hole 500.

[0036] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 5 As shown, after pouring concrete on the horizontal section of the guide wall reinforcement cage 200, the steps further include: S700, after the strength of the guide wall 400 reaches a preset strength, digging downward on the basis of the guide wall groove 100 to form a continuous wall groove; S800, place the continuous wall reinforcement cage 300 downward into the continuous wall groove, and connect the preset position of the continuous wall reinforcement cage 300 to the inclined hook 720.

[0037] Specifically, the upper end of the continuous wall reinforcement cage 300 is provided with a hook member that cooperates with the diagonal hook 720 on one side close to the vertical section of the guide wall 400. After the continuous wall reinforcement cage 300 is completely placed in the continuous wall groove, the hook member on the continuous wall reinforcement cage 300 is hooked with the diagonal hook 720 one by one.

[0038] Furthermore, the tension of the continuous wall reinforcement cage 300 on the inclined hook 720 is transmitted to the horizontal section of the guide wall 400 through the first inclined reinforcement 710. The horizontal section of the guide wall 400 evenly disperses the tension to the horizontal soil layer, thereby enabling the continuous wall reinforcement cage 300 to maintain a stable placement state.

[0039] In some embodiments of the present invention, Figure 4As shown, the angle between the first inclined hole 500 and the second inclined hole 600 is 20-60 degrees. Specifically, when the tensioning force provided by the inclined steel bars 700 in the first inclined hole 500 and the second inclined hole 600 to the guide wall steel cage 200 is the largest and the tensioning forces in both directions of the two are the most stable, the angle between the first inclined hole 500 and the second inclined hole 600 is 20-60 degrees. Further, the angle between the first inclined hole 500 and the second inclined hole 600 is the angle in the up-down direction, and the size of the angle between the two can be adjusted according to the soil quality of the soil layer at the location, and the comprehensive optimal angle is generally 35 degrees.

[0040] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the plurality of first oblique holes 500 are divided into a plurality of oblique hole groups. Each oblique hole group includes a plurality of first oblique holes 500, and the plurality of first oblique holes 500 in each oblique hole group are evenly distributed along the length direction of the guide wall groove 100. The plurality of oblique hole groups are evenly distributed along the vertical direction.

[0041] Specifically, each inclined hole group corresponds to a plurality of inclined hooks 720, so that the plurality of inclined hooks 720 are arranged in an array on the vertical section of the guide wall 400. The plurality of inclined hooks 720 arranged in an array can further increase the stability of the connection between the continuous wall reinforcement cage 300 and the inclined hooks 720. It should be noted that, since the first inclined hole 500 is arranged obliquely, the plurality of inclined hole groups are evenly distributed in the vertical direction, so that the length of the first inclined hole 500 below in the vertical direction is greater than the length above it, that is, the first inclined hole 500 below is located obliquely below the first inclined hole 500 above.

[0042] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A low clearance underground continuous wall construction method, characterized in that: include: Construction inspection, obtaining construction location; Excavate the foundation pit at the construction location to form the guide wall trench; A plurality of first oblique holes and a plurality of second oblique holes are drilled downward on the upper surfaces of both sides of the guide wall groove; the first oblique holes and the second oblique holes have opposite inclination directions; L-shaped guide wall reinforcement cages are arranged on both sides of the guide wall groove; Inserting the inclined steel bars into the first inclined hole and the second inclined hole, and the upper ends of the inclined steel bars extend upward out of the first inclined hole and the second inclined hole; The horizontal section of the guide wall reinforcement cage is fixedly connected to the upper end of the inclined reinforcement.

2. The low clearance underground continuous wall construction method according to claim 1, characterized in that: The step of drilling a plurality of first oblique holes and a plurality of second oblique holes downwardly on the upper surfaces of both sides of the guide wall groove further includes: The first inclined hole is drilled obliquely from the upper surface of the guide wall groove into the guide wall groove; The inclined steel bar located in the first inclined hole is a first inclined steel bar; the lower end of the first inclined steel bar extends outward from the lower end of the first inclined hole to the vertical section of the guide wall steel bar cage and is located in the guide wall groove; An oblique-stayed hook is arranged at the lower end of the first oblique-stayed steel bar.

3. The low clearance underground continuous wall construction method according to claim 1, characterized in that: The steps after installing the diagonal hook at the lower end of the first diagonal steel bar include: The lower end of the first inclined steel bar is fixedly connected to the vertical section of the guide wall steel cage.

4. The low clearance underground continuous wall construction method according to claim 1, characterized in that: The second oblique hole includes a first section and a second section; The first section is located at the upper end of the second section; the diameter of the second section is greater than the diameter of the first section.

5. The low clearance underground continuous wall construction method according to claim 2, characterized in that: After the step of fixing the horizontal section of the guide wall reinforcement cage to the upper end of the inclined reinforcement, the method further includes: pouring concrete into the second inclined hole; pouring concrete on the vertical section of the guide wall reinforcement cage; pouring concrete into the first inclined hole; Pour concrete on the horizontal section of the guide wall reinforcement cage.

6. The low clearance underground continuous wall construction method according to claim 5, characterized in that: The step after pouring concrete on the horizontal section of the guide wall reinforcement cage also includes: After the strength of the guide wall reaches a preset strength, digging downward on the basis of the guide wall groove to form a continuous wall groove; The continuous wall reinforcement cage is placed downwardly in the continuous wall groove, and the preset position of the continuous wall reinforcement cage is connected to the inclined hook.

7. The low clearance underground continuous wall construction method according to claim 1, characterized in that: The included angle between the first oblique hole and the second oblique hole is 20-60 degrees.

8. The low clearance underground continuous wall construction method according to claim 2, characterized in that: The plurality of the first oblique holes are divided into a plurality of oblique hole groups; Each of the inclined hole groups includes a plurality of first inclined holes; the plurality of first inclined holes in each of the inclined hole groups are evenly distributed along the length direction of the guide wall groove; The plurality of inclined hole groups are evenly distributed along the vertical direction.

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