Construction method of integrated structure of shear reinforcement and reserved connectors for underground continuous wall

Abstract

The present invention provides a construction method for an integrated structure of shear reinforcement and reserved connectors for an underground continuous wall, comprising: connecting a double-hole reinforcement connector to the straight end of a horizontal reinforcement on the opposite side of a non-through screw hole to form an integrated structure; after the underground continuous wall reinforcement cage is tied, placing the integrated structure into the underground continuous wall reinforcement cage, connecting one end with a hook to the vertical main reinforcement of the underground continuous wall on the soil-facing side, and placing the double-hole reinforcement connector on the outside of the vertical main reinforcement of the underground continuous wall on the pit-facing side; screwing the connector into the through screw hole; lowering the reinforcement cage after the underground continuous wall is grooved, and the integrated structure acts as the shear reinforcement of the underground continuous wall during the foundation pit excavation phase; excavating the foundation pit to the base, exposing the double-hole reinforcement connector, and subsequently tying the inner lining wall reinforcement and screwing the connecting reinforcement into the non-through screw hole. The present invention can ensure the quality of underground continuous wall casting, reduce the amount of reinforcement used, and simplify the reinforcement cage tying process.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering design and construction, and in particular to a construction method for an integrated structure of shear-resistant steel bars and reserved connectors of an underground continuous wall. Background Art

[0002] Diaphragm walls offer high rigidity, integrity, and impermeability. They can also be combined with reinforced concrete lining walls to share water and soil pressure during normal use, making them widely used in deep foundation pit projects in soft soil areas. To meet the shear bearing capacity requirements of the diaphragm wall during excavation, shear reinforcement is required within the diaphragm wall. Furthermore, reinforced concrete lining wall rebar connectors are provided within the diaphragm wall. These connectors are screwed into the lining wall during the structural backfill phase, ensuring that the diaphragm wall and reinforced concrete lining wall share the load during normal use. With the continued advancement and deepening of urbanization in my country, land resources in central urban areas are becoming increasingly scarce. Underground space development is characterized by deep excavation depths and high basement heights, placing increasingly stringent requirements on the specifications and spacing of shear reinforcement and reinforced concrete lining wall rebar connectors. Existing design methods typically separately install shear reinforcement and reinforced concrete lining wall rebar connectors within the diaphragm wall. The large number of horizontal shear reinforcement and lining wall rebar connectors makes concrete pouring difficult, compromising wall quality, and posing safety risks. Summary of the Invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a construction method for an integrated structure of shear reinforcement and reserved connectors of an underground continuous wall.

[0004] According to one aspect of the present invention, a construction method for an integrated structure of shear reinforcement bars and reserved connectors for an underground continuous wall is provided, comprising:

[0005] A horizontal steel bar and a double-hole steel bar connector are provided, wherein the horizontal steel bar has one end with a hook and a straight end, and a through screw hole and a non-through screw hole are sequentially provided on the double-hole steel bar connector. The double-hole steel bar connector is connected to the straight end of the horizontal steel bar on the opposite side of the non-through screw hole to form an integrated structural structure; after the underground continuous wall steel bar cage is tied, the integrated structural structure is placed in the underground continuous wall steel bar cage as a whole, the hooked end of the horizontal steel bar is connected to the vertical main reinforcement of the underground continuous wall on the soil-facing side, and the double-hole steel bar connector is placed on the outside of the vertical main reinforcement of the underground continuous wall on the pit-facing side;

[0006] The connecting piece is screwed into the through screw hole of the double-hole steel bar connector to connect the integrated structural structure with the vertical main reinforcement of the underground continuous wall facing the pit surface, and the underground continuous wall reinforcement cage is formed as a whole; after the underground continuous wall is grooved, the reinforcement cage is lowered, and during the foundation pit excavation stage, the integrated structural structure acts as the underground continuous wall shear reinforcement to participate in the load;

[0007] The foundation pit is excavated to the base, and the protective layer on the facing side of the underground continuous wall is stripped off to expose the double-hole steel bar connector. The lining wall reinforcement is then tied and the connecting reinforcement is screwed into the non-penetrating screw holes of the double-hole steel bar connector to ensure that the reinforced concrete lining wall and the underground continuous wall are subjected to joint force during normal use.

[0008] Furthermore, a horizontal steel bar and a double-hole steel bar connector are provided, wherein: the double-hole steel bar connector is L-shaped, including an outer protrusion and an inner concave portion perpendicular to each other, the non-through screw hole is located on one side of the outer protrusion, and the straight end of the horizontal steel bar is located on the other side of the outer protrusion; the through screw hole is located in the inner concave portion.

[0009] Furthermore, the double-hole steel bar connector is connected to the straight end of the horizontal steel bar on the opposite side of the non-through screw hole, including: welding the double-hole steel bar connector to the straight end of the horizontal steel bar on the opposite side of the non-through screw hole.

[0010] Furthermore, the connecting piece is screwed into the through screw hole of the double-hole steel bar connector, wherein: the connecting piece adopts a connecting bolt.

[0011] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0012] Compared to the existing method of independently installing shear reinforcement and lining wall reserved reinforcement connectors within underground continuous walls, the present invention combines the ground wall shear reinforcement during the excavation phase with the reinforced concrete lining wall reserved reinforcement connectors during normal use, forming an integrated connection structure. This solves the technical problems of the underground continuous wall reinforcement cage being too densely packed with horizontal reinforcement and the difficulty in ensuring the quality of underground continuous wall casting due to the independent installation of shear reinforcement and reinforced concrete lining wall reserved reinforcement connectors, and can effectively improve the wall quality of underground continuous walls. In addition, the integrated structure can reduce the amount of steel used, lighten the weight of the reinforcement cage, and simplify the reinforcement cage binding process, which has certain advantages in terms of engineering economy and construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0014] Figure 1It is a schematic elevation view of an integrated structure of shear reinforcement bars and reserved connectors for an underground continuous wall in one embodiment of the present invention;

[0015] Figure 2 AA cross-sectional schematic diagram of the integrated structure of shear reinforcement and reserved connectors of the underground continuous wall in one embodiment of the present invention;

[0016] Figure 3 3D schematic diagram of an integrated structure of shear reinforcement and reserved connectors for an underground continuous wall according to one embodiment of the present invention, wherein (a) is a schematic structural diagram of the integrated structure, and (b) is a schematic structural diagram of each component;

[0017] Figure 4 This is a schematic diagram corresponding to step 1 of a construction method for an integrated structure of shear reinforcement bars and reserved connectors for an underground continuous wall according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram corresponding to step 2 of the construction method for an integrated structure of shear reinforcement bars and reserved connectors for an underground continuous wall according to one embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram corresponding to step three of the construction method for the integrated structure of shear reinforcement and reserved connectors of an underground continuous wall in one embodiment of the present invention.

[0020] Among them, the corresponding figures are: 1-horizontal steel bars, 2-double-hole steel bar connector, 3-connecting parts, 4-underground continuous wall, 5-vertical main bars of underground continuous wall, 6-horizontal bars of underground continuous wall, 7-reinforced concrete lining wall connecting steel bars, 8-reinforced concrete lining wall, 9-vertical main bars of reinforced concrete lining wall, 10-horizontal bars of reinforced concrete lining wall, a-pit side, b-soil side, c-top beam, d-structural beam and slab, e-foundation bottom plate. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to 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 skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0022] The embodiment of the present invention provides a construction method for an integrated structure of shear reinforcement and reserved connectors of an underground continuous wall, referring to Figure 1-3A multi-layer structural beam d is set in the foundation pit as the internal support of the foundation pit enclosure. A top beam c is set above the underground continuous wall 4, and the bottom of the underground continuous wall 4 is connected to the foundation bottom plate e. The underground continuous wall 4 is provided with underground continuous wall vertical main reinforcement 5 and underground continuous wall horizontal reinforcement 6. The reinforced concrete lining wall 8 is provided with reinforced concrete lining wall vertical main reinforcement 9 and reinforced concrete lining wall horizontal reinforcement 10. The structure includes horizontal steel bars 1, double-hole steel bar connectors 2 and connectors 3. The horizontal steel bar 1 has one end with a hook and a straight end. The straight end of the horizontal steel bar 1 is fixedly connected to the double-hole steel bar connector 2, and the end with the hook is hooked on the vertical main reinforcement 5 of the underground continuous wall on the soil-facing side b, which can meet the connection requirements between the horizontal steel bar 1 and the vertical main reinforcement 5 of the underground continuous wall. After the underground continuous wall reinforcement cage is tied, the underground continuous wall reinforcement cage is placed as a whole. The hooked end of the double-hole steel bar connector 2 is connected to the vertical main reinforcement 5 of the underground continuous wall on the soil-facing side b, and the double-hole steel bar connector 2 is placed on the outside of the vertical main reinforcement 5 of the underground continuous wall on the pit-facing side a. The double-hole steel bar connector 2 is provided with a through-hole screw hole for receiving the connector 3, and a non-through-hole screw hole is provided. During the backbuilding process of the inner lining wall, the reinforced concrete inner lining wall connecting steel bar 7 is connected through the non-through-hole screw hole. The opposite side of the non-through-hole screw hole is connected to the straight end of the horizontal steel bar 1. After the double-hole steel bar connector 2 and the horizontal steel bar 1 are placed in the underground continuous wall reinforcement cage, the connector 3 is screwed into the through-hole screw hole to ensure that the integrated structural structure is connected to the vertical main reinforcement 5 of the underground continuous wall on the pit side a. Specifically, the construction method includes the following steps:

[0023] Step 1: Provide a horizontal steel bar 1 and a double-hole steel bar connector 2. The horizontal steel bar 1 has one end with a hook and a straight end. The double-hole steel bar connector 2 is sequentially provided with a through screw hole and a non-through screw hole. Connect the double-hole steel bar connector 2 to the straight end of the horizontal steel bar 1 on the opposite side of the non-through screw hole to form an integrated structural structure. After the underground continuous wall steel bar cage is tied, put the integrated structural structure into the underground continuous wall steel bar cage as a whole. The end with the hook of the horizontal steel bar 1 is connected to the vertical main reinforcement 5 of the underground continuous wall on the soil-facing side b. The double-hole steel bar connector 2 is placed on the outside of the vertical main reinforcement 5 of the underground continuous wall on the pit-facing side a.

[0024] In some embodiments, a horizontal steel bar 1 and a double-hole steel bar connector 2 are provided, wherein: the double-hole steel bar connector 2 is L-shaped, including a convex portion and a concave portion perpendicular to each other, the non-through screw hole is located on one side of the convex portion, and the straight end of the horizontal steel bar 1 is located on the other side of the convex portion; the through screw hole is located in the concave portion. Through this L-shaped structure, the convex size of the connector 3 can be reduced to ensure the thickness of the protective layer of the underground continuous wall.

[0025] In some embodiments, the double-hole steel bar connector 2 is connected to the straight end of the horizontal steel bar 1 on the opposite side of the non-through screw hole, including: welding the double-hole steel bar connector 2 to the straight end of the horizontal steel bar 1 on the opposite side of the non-through screw hole. The welding can be completed in batches in the factory, and the stability and reliability of the connection can be guaranteed by the welding connection.

[0026] Step 2: Screw the connector 3 into the through screw hole of the double-hole steel bar connector 2 to connect the integrated structural structure with the vertical main reinforcement of the underground continuous wall facing the pit surface, and the underground continuous wall reinforcement cage is formed as a whole; after the underground continuous wall is grooved, the reinforcement cage is lowered, and the integrated structural structure participates in the load as the shear reinforcement of the underground continuous wall during the foundation pit excavation stage;

[0027] In some preferred embodiments, the connecting member 3 uses connecting bolts to make the connection between the integrated structural structure and the vertical main reinforcement 5 of the underground continuous wall on the pit side a convenient, fast, stable and reliable.

[0028] In some other embodiments, other forms of connectors 3, such as a socket-type locking structure, may also be used, as long as they can achieve the same functions as described above.

[0029] Step 3: Excavate the foundation pit to the base, remove the protective layer on the facing side of the underground continuous wall, expose the double-hole steel bar connector 2, follow up with tying the lining wall steel bars and screwing the connecting steel bars into the non-penetrating screw holes of the double-hole steel bar connector 2 to ensure that the reinforced concrete lining wall 8 and the underground continuous wall 4 are subjected to joint force during normal use.

[0030] In a preferred embodiment, the construction method comprises the following steps:

[0031] Step 1, refer to Figure 4 The L-shaped double-hole steel bar connector 2 is welded to the horizontal steel bar 1 with a hook at one end. The welding process is completed in batches at the factory. After the underground diaphragm wall reinforcement cage is tied, the welded double-hole steel bar connector 2 and the horizontal steel bar 1 with a hook at one end are placed as a whole into the underground diaphragm wall reinforcement cage. The hooked end is connected to the vertical main reinforcement 5 of the underground diaphragm wall on the soil-facing side b. The L-shaped double-hole steel bar connector 2 is placed on the outside of the vertical main reinforcement 5 of the underground diaphragm wall on the pit-facing side a.

[0032] Step 2, refer to Figure 5 Connecting bolts (3) are screwed into the through-holes in the recessed L-shaped double-hole rebar connectors (2), connecting the integrated structural structure to the vertical main reinforcement (5) of the diaphragm wall on the facing side (a), thus forming a complete diaphragm wall reinforcement cage. After the diaphragm wall (4) is trenched, the reinforcement cage is lowered and the wall concrete is poured. During the excavation phase, the integrated structural structure acts as shear reinforcement for the diaphragm wall.

[0033] Step 3, refer to Figure 6, excavate the foundation pit to the base, remove the protective layer on the facing side of the underground continuous wall, expose the outer protrusion of the L-shaped double-hole steel bar connector 2, follow up with the lining wall reinforcement and screw the reinforced concrete lining wall connecting steel bar 7 into the non-penetrating screw hole of the outer protrusion of the double-hole steel bar connector 2 to ensure that the reinforced concrete lining wall 8 and the underground continuous wall 4 are subjected to the same force during normal use.

[0034] The above-described embodiment of the present invention combines the shear reinforcement of the ground wall during the excavation phase with the connectors for the reserved reinforcement of the reinforced concrete lining wall during normal use, forming an integrated connection structure. This solves the technical problem of the independent installation of the shear reinforcement and the connectors for the reserved reinforcement of the reinforced concrete lining wall, which results in excessively dense horizontal reinforcement in the underground diaphragm wall reinforcement cage and difficulty in ensuring the pouring quality of the underground diaphragm wall. Furthermore, this integrated structure reduces the amount of steel used, lightens the weight of the reinforcement cage, and simplifies the reinforcement cage tying process, offering certain advantages in terms of engineering economy and construction efficiency.

[0035] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various modifications or variations within the scope of the claims without affecting the essence of the present invention. The above preferred features may be used in any combination as long as they do not conflict with each other.

Claims

1. A construction method for an integrated structure of shear reinforcement and reserved connectors for an underground continuous wall, characterized in that: include: A horizontal steel bar and a double-hole steel bar connector are provided, wherein the horizontal steel bar has one end with a hook and a straight end, and a through screw hole and a non-through screw hole are sequentially provided on the double-hole steel bar connector. The double-hole steel bar connector is connected to the straight end of the horizontal steel bar on the opposite side of the non-through screw hole to form an integrated structural structure. The integrated structural structure combines the shear reinforcement of the ground wall in the excavation stage and the reserved steel bar connector of the reinforced concrete lining wall in the normal use stage into one; after the underground continuous wall steel bar cage is tied, the integrated structural structure is placed as a whole in the underground continuous wall steel bar cage, the hooked end of the horizontal steel bar is connected to the vertical main reinforcement of the underground continuous wall on the soil side, and the double-hole steel bar connector is placed on the outside of the vertical main reinforcement of the underground continuous wall on the pit side; The connecting piece is screwed into the through screw hole of the double-hole steel bar connector, so that the integrated structural structure is connected to the vertical main reinforcement of the underground continuous wall on the pit side, and the underground continuous wall reinforcement cage is formed as a whole; after the underground continuous wall is grooved, the reinforcement cage is lowered, and during the foundation pit excavation stage, the integrated structural structure acts as the shear reinforcement of the underground continuous wall to participate in the load; The foundation pit is excavated to the base, and the protective layer on the facing side of the underground continuous wall is stripped off to expose the double-hole steel bar connector. The lining wall reinforcement is then tied and the connecting reinforcement is screwed into the non-penetrating screw holes of the double-hole steel bar connector to ensure that the reinforced concrete lining wall and the underground continuous wall are subjected to joint force during normal use.

2. The construction method of the integrated structure of shear reinforcement and reserved connectors of underground continuous wall according to claim 1 is characterized in that: The invention provides a horizontal steel bar and a double-hole steel bar connector, wherein: the double-hole steel bar connector is L-shaped, including an outer protrusion and an inner concave portion perpendicular to each other, the non-through screw hole is located on one side of the outer protrusion, and the straight end of the horizontal steel bar is located on the other side of the outer protrusion; the through screw hole is located in the inner concave portion.

3. The construction method of the integrated structure of shear reinforcement and reserved connectors of underground continuous wall according to claim 1 is characterized in that: Connecting the double-hole steel bar connector to the straight end of the horizontal steel bar on the opposite side of the non-through screw hole includes: welding the double-hole steel bar connector to the straight end of the horizontal steel bar on the opposite side of the non-through screw hole.

4. The construction method of the integrated structure of shear reinforcement and reserved connectors of underground continuous wall according to claim 1 is characterized in that: The connecting piece is screwed into the through screw hole of the double-hole steel bar connector, wherein the connecting piece is a connecting bolt.

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