Connecting structure of underground continuous wall and construction method thereof

Abstract

The application discloses a connecting structure of underground continuous wall and a construction method thereof, and the connecting structure at least comprises a connecting head, a water stop belt, a connecting piece and an edge sealing steel bar; the connecting head is connected with the water stop belt, the connecting piece is connected with the water stop belt; the edge sealing steel bar is provided with a groove corresponding to the connecting piece, the groove is connected with the connecting piece; and the water stop belt is made of flexible material. The construction method is based on the connecting structure to connect a preceding wall section with a subsequent wall section, so as to form the underground continuous wall. The connecting head, the water stop belt, the connecting piece and the edge sealing steel bar are sequentially connected, so that the preceding wall section and the subsequent wall section are connected; the water stop belt is made of flexible material, can adapt to the differential deformation of the connecting position, the shrinkage and creep deformation of concrete, avoids the seepage path caused by the differential deformation, and further plays a role of waterproofing and water stopping.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground continuous walls, and particularly relates to a connecting structure of an underground continuous wall and a construction method. BACKGROUND

[0002] An underground continuous wall is a kind of underground continuous wall body formed by means of a trenching machine, with the aid of the action of a wall protection slurry, to drill and dig a trench with a certain length, thickness and depth into the ground, to place a reinforcement cage in the trench after trench cleaning, and to pour concrete and other materials in the trench. It has the functions of resisting soil, preventing water seepage and bearing weight. The underground continuous wall technology has the advantages of small vibration, low noise, high work efficiency, short construction period and the like, and has small disturbance to the surrounding foundation, and the wall body has relatively large rigidity, which is beneficial to application in urban construction. In addition, the underground continuous wall has large bearing capacity, and can replace the function of a continuous wall body in a traditional foundation form.

[0003] In the construction process of the underground continuous wall, the connecting head water stop is the most critical technical link. The connecting head in the prior art is mainly divided into a flexible connecting head and a rigid connecting head. The underground continuous wall adopting the flexible connecting head is not truly continuous, and the flexible connecting head cannot transmit bending moment, shear force and the like, and is severely deformed after being stressed. The underground continuous wall adopting the rigid connecting head realizes true continuity, and the rigid connecting head can transmit bending moment, shear force and the like, and is less deformed after being stressed, and is convenient to construct. Therefore, the rigid connecting head is widely used in actual engineering.

[0004] However, when the underground continuous wall is used as a permanent underground space structure, the rigid connecting head has the following problems: (1) due to the limitation of the current construction technology and process level, the rigid connecting head of the underground continuous wall, such as an I-shaped steel connecting head, is prone to leakage due to non-compactness of a hole in the process of pouring concrete; (2) the rigid connecting head, such as the I-shaped steel connecting head, has mud skin between the poured concrete and the I-shaped steel connecting head due to slurry flow around and adhesion to the surface of the I-shaped steel connecting head, and the mud skin is separated after being stressed, and leakage occurs under the pressure of water. Due to differential deformation, it is difficult to avoid leakage or dampness caused by seepage.

[0005] For the leakage at the wall width joint, the prior art usually adopts mixing piles, rotary jet piles and the like for plugging. This treatment method can only deal with temporary most underground continuous walls for soil retaining or water retaining, and is difficult to be applied to permanent underground continuous walls.

[0006] Therefore, it is urgent to provide a connecting structure of a permanent underground continuous wall. SUMMARY

[0007] In view of the above-mentioned defects or deficiencies of the prior art, the technical problem to be solved by the application is to provide a connecting structure of an underground continuous wall and a construction method.

[0008] To solve the above technical problems, the application realizes the technical solutions as follows:

[0009] The application provides a connecting structure of an underground continuous wall, which at least comprises a connecting head, a water stop belt, a connecting piece and an edge sealing steel bar; the connecting head is connected with the water stop belt, and the connecting piece is connected with the water stop belt; the edge sealing steel bar is provided with a groove corresponding to the connecting piece, and the groove is connected with the connecting piece; and the water stop belt is made of a flexible material.

[0010] Further, the connecting structure of the underground continuous wall, wherein the connecting head at least comprises a web and two flanges, the two flanges are oppositely arranged and connected by the web; the edge sealing steel bar is arranged on one side of the web, and two ends of the edge sealing steel bar are respectively connected with the two flanges.

[0011] Further, the connecting structure of the underground continuous wall, wherein the web is arranged on one side deviated from the center line of the flange where the edge sealing steel bar is arranged.

[0012] Further, the connecting structure of the underground continuous wall, wherein the connecting structure further comprises a grouting cleaning pipe, and the grouting cleaning pipe is arranged between the connecting head and the water stop belt.

[0013] Further, the connecting structure of the underground continuous wall, wherein the connecting head is further provided with a guide groove, and the water stop belt is detachably connected with the guide groove.

[0014] Further, the connecting structure of the underground continuous wall, wherein the water stop belt is further provided with a reinforcing rib, and the reinforcing rib is arranged on the connecting side of the water stop belt and the connecting head.

[0015] Further, the connecting structure of the underground continuous wall, wherein an inclined surface structure is arranged at the end of the water stop belt.

[0016] Further, the connecting structure of the underground continuous wall, wherein the connecting piece comprises a bending structure.

[0017] Further, the connecting structure of the underground continuous wall, wherein a plating layer structure is arranged on the surface of the connecting piece.

[0018] The application further provides a construction method based on the connecting structure, which comprises the following steps:

[0019] S1: a leading wall with a connecting head is arranged in a to-be-constructed trench, and a grouting cleaning pipe is arranged in the to-be-constructed trench;

[0020] S2: the edge sealing steel bar is connected with a steel reinforcement cage.

[0021] S3: the connecting piece with the water stop belt is connected with the edge reinforcing steel bars;

[0022] S4: the water stop belt, the connecting piece, the edge reinforcing steel bars and the reinforcing cage are hoisted and connected, and the water stop belt is connected with the connecting head;

[0023] S5: the grouting and cleaning pipe is used to clean the surface of the connecting head, the water stop belt and the connecting piece by high-pressure water;

[0024] S6: the edge reinforcing steel bars and the reinforcing cage are poured;

[0025] S7: the grouting and cleaning pipe is used to inject grout by a grouting machine.

[0026] Compared with the prior art, the application has the following technical effects:

[0027] The connecting head, the water stop belt, the connecting piece and the edge reinforcing steel bars are sequentially connected, so that the front wall and the rear adjacent wall are connected; the water stop belt is made of flexible material, can adapt to the differential deformation at the connection, the shrinkage and creep deformation of concrete, avoids the seepage path caused by the differential deformation, and plays a role of waterproofing and water stopping. BRIEF DESCRIPTION OF DRAWINGS

[0028] Other features, objects and advantages of the application will become more apparent after reading the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0029] Figure 1 : the schematic view of the transverse section of the connecting structure in an embodiment of the application;

[0030] Figure 2 : the schematic view of the connection between the connecting head and the edge reinforcing steel bars in an embodiment of the application;

[0031] Figure 3 : the schematic view of the transverse section of the connection between the water stop belt and the connecting piece in an embodiment of the application;

[0032] Figure 4 : the partial schematic view of the connection between the water stop belt and the connecting piece in an embodiment of the application;

[0033] Figure 5 : the A-A sectional view of the structure shown in Figure 4 ;

[0034] Figure 6 : the partial schematic view of the connection between the water stop belt and the connecting piece in an embodiment of the application;

[0035] Figure 7 : the B-B sectional view of the structure shown in Figure 6 ;

[0036] Figure 8 Figure 1 is a schematic view of the connecting head and the grouting cleaning pipe in an embodiment of the present application;

[0037] In the figure: connecting head 1, web plate 101, flange 102, guide groove 103, water stop 2, reinforcing rib 201, inclined surface structure 202, reserved hole 203, connecting piece 3, edge sealing steel bar 4, groove 401, grouting cleaning pipe 5, steel cage 6, leading wall section 7, adjacent wall section 8, earth-facing side 9 and earth-back side 10. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] As shown in Figure 1 one of the embodiments of the present application, a connecting structure of an underground continuous wall at least includes: a connecting head 1, a water stop 2, a connecting piece 3 and an edge sealing steel bar 4; the connecting head 1 is connected with the water stop 2, and the connecting piece 3 is connected with the water stop 2; the edge sealing steel bar 4 is provided with a groove 401 corresponding to the connecting piece 3, and the groove 401 is connected with the connecting piece 3; and the water stop 2 is made of a flexible material.

[0040] In the embodiment, a first side of the water stop 2 is connected with the connecting head 1, and a second side of the water stop 2 is connected with the connecting piece 3, wherein the first side and the second side are oppositely arranged. The edge sealing steel bar 4 is provided with the groove 401 corresponding to the connecting piece 3, and the connecting piece 3 is connected with the edge sealing steel bar 4 through the groove 401. Specifically, the connecting piece 3 can be connected with the edge sealing steel bar 4 in a welding manner, or the connecting piece 3 is provided with a through hole, and after the connecting piece 3 is inserted into the groove 401 of the edge sealing steel bar 4, the connecting piece 3 and the edge sealing steel bar 4 are bound together through the through hole by buckling or steel wire, so as to realize the connection of the two. The leading wall section 7 and the adjacent wall section 8 of the underground continuous wall are connected through the connecting head 1, the water stop 2, the connecting piece 3 and the edge sealing steel bar 4, the water stop 2 is made of a flexible material, and by using the self-characteristics of the flexible material, the difference deformation at the connecting position of the leading wall section 7 and the adjacent wall section 8, the concrete shrinkage and creep deformation can be adapted, the seepage path generated due to the difference deformation is avoided, and the waterproof and water-stopping effects are achieved.

[0041] Optionally, the water stop 2 is made of a rubber material, and those skilled in the art have the motivation to use other high polymer materials.

[0042] Specifically, the connecting head 1 at least comprises a web plate 101 and two flanges 102, the two flanges 102 are oppositely arranged and connected by the web plate 101; the edge sealing steel bars 4 are arranged on one side of the web plate 101, and the two ends of the edge sealing steel bars 4 are respectively connected with the two flanges 102.

[0043] In the embodiment, the two flanges 102 are oppositely arranged and connected by the web plate 101; one side of the web plate 101 is connected with the preceding wall 7, and the other side of the web plate 101 is inserted by the edge sealing steel bars 4, and the edge sealing steel bars 4 are overlapped and connected with the flanges 102, so as to achieve the purpose of transmitting bending moment and shear force, as shown in Figure 2 Of course, those skilled in the art are motivated to use other structures of the connecting head 1, such as the connecting head 1 with a cross-shaped structure in the transverse section.

[0044] Specifically, the web plate 101 is arranged on one side deviating from the center line of the flange 102 where the edge sealing steel bars 4 are arranged. By arranging the connecting head 1 as an asymmetric structure, the space utilization between the flanges 102 is facilitated, and unnecessary waste of the preceding wall 7 is reduced.

[0045] As shown in Figure 3 The water stop belt 2 is also provided with a reinforcing rib 201, which is arranged on the connecting side of the water stop belt 2 and the connecting head 1.

[0046] In the embodiment, the reinforcing rib 201 is a steel bar, which is arranged in the first side of the water stop belt 2 to avoid deformation of the connecting part of the water stop belt 2 and the connecting head 1 caused by the use of flexible materials.

[0047] Specifically, the connecting head 1 is also provided with a guide groove 103, and the water stop belt 2 is detachably connected with the guide groove 103. The guide groove 103 is arranged to facilitate the quick connection of the water stop belt 2 and the connecting head 1, and also provides protection for the water stop belt 2.

[0048] In the embodiment, two steel plates with L-shaped cross sections are oppositely arranged on the connecting head 1 to form a half-open guide groove 103 together with the side wall of the connecting head 1; the first side of the water stop belt 2 is inserted into the guide groove 103 to achieve detachable connection with the connecting head 1; the cross section of the first side of the water stop belt 2 in the embodiment is square, and those skilled in the art are motivated to arrange it as a triangle, a circle or a rectangle, etc.

[0049] As shown in Figures 3 to 7 The end of the water stop belt 2 is provided with an inclined surface structure 202.

[0050] In the embodiment, the end of the second side of the water stop belt 2 is provided with an inclined surface structure 202 which is symmetrically arranged along the center line of the transverse section of the water stop belt 2, as shown in Figure 2As shown, the connecting piece 3 is arranged between the two inclined surface structures 202, so that the connection between the waterstop 2 and the connecting piece 3 is smoothly transitioned, avoiding stress concentration. In the embodiment, the end surface of the third side of the waterstop 2 is also provided with an inclined surface structure 202, as shown in Figures 3 to 6 As shown, in actual construction process, the total length of the waterstop 2 and the connecting piece 3 is set according to actual situation, in order to facilitate transportation and construction, etc., the waterstop 2 and the connecting piece 3 are connected in sections, the third side of the waterstop 2, i.e. the part of the two adjacent sections of the waterstop 2 is provided with a symmetrical inclined surface structure 202, so as to ensure that the thickness of the waterstop 2 at the joint part is not increased, and at the same time, the connection area is increased, ensuring the reliability of the connection. The steel bar in the first side of the two adjacent sections of the waterstop 2 is also provided in sections, the first side of the upper section of the waterstop 2 is provided with a reserved hole 203 for connecting the steel bar of the lower section of the waterstop 2, and the surface of the lower section of the steel bar and the inclined surface structure 202 at the joint part are coated with an adhesive, the lower section of the steel bar is inserted into the reserved hole 203, the adhesive bonds the two adjacent sections of the waterstop 2, and the connection is completed. The joint surface of the two sections of the connecting piece 3 is connected by welding.

[0051] Specifically, the connecting piece 3 includes but is not limited to a bending structure. By providing the bending structure, a certain deformation space is provided, and the construction precision requirement is reduced.

[0052] Optionally, the connecting piece 3 is made of a rigid material. The connecting piece 3 made of a rigid material can provide rigidity to the second side of the waterstop 2 after being connected to the second side of the waterstop 2.

[0053] Optionally, the connecting piece 3 is provided with a plating structure outside to prevent the connecting piece 3 from being corroded.

[0054] In the embodiment, the connecting piece 3 is made of a galvanized profiled steel plate, one side of which is connected to the second side of the waterstop 2, and the other side is welded to the groove 401 of the edge reinforcing bar 4. Of course, a through hole can also be provided on the connecting piece 3, and the connecting piece 3 and the edge reinforcing bar 4 can be tied together by using buckles or steel wires.

[0055] As shown in Figure 1 and Figure 8 Further comprising: a grouting cleaning pipe 5 arranged between the connecting head 1 and the waterstop 2.

[0056] In the embodiment, the number of grouting cleaning pipes 5 is set to three, and those skilled in the art are motivated to adaptively increase or decrease the number. Specifically, the three grouting cleaning pipes 5 are arranged on the side of the web plate 101 provided with the water stop belt 2, two of which are arranged at the intersection of the two flange plates 102 and the web plate 101, and the other is arranged in the guide groove 103. Through the above arrangement, the three grouting cleaning pipes 5 can avoid the connection head 1, the guide groove 103, the water stop belt 2 and the connecting piece 3 from being covered with mud during construction; at the same time, it can also complete the grouting operation, so that the guide groove 103 and the water stop belt 2 are filled densely, the non-dense part of the connection head 1 is filled, thereby achieving the purpose of preventing seepage.

[0057] As shown in Figure 8 The top end of the three grouting cleaning pipes 5 is 20-30 cm higher than the connection head 1, and the bottom end is also 50-55 cm higher than the connection head 1. Through the above arrangement, it is convenient to connect the grouting cleaning pipe 5 with the pressure grouting machine or high-pressure water pump during construction.

[0058] Another aspect of the present application also provides a construction method based on the above connection structure. In the embodiment, the water stop belt 2 and the connecting piece 3 have been connected in the factory, and the specific construction steps are as follows:

[0059] S1: The leading wall 7 with the connection head 1 is located in the to-be-constructed trench, wherein one flange plate 102 of the connection head 1 abuts against the soil-facing side 9, and the other flange plate 102 abuts against the soil-backing side 10; the grouting cleaning pipe 5 is arranged in the to-be-constructed trench;

[0060] S2: The edge steel bar 4 is welded with the steel cage 6;

[0061] S3: The connecting piece 3 is connected with the groove 401 of the edge steel bar 4 by welding, or a through hole is arranged on the connecting piece 3 and connected with the edge steel bar 4 by buckling or steel wire;

[0062] S4: According to the actual construction environment, the water stop belt 2 and the connecting piece 3 are overlapped, so that the total length of the water stop belt 2 and the connecting piece 3 meets the actual demand;

[0063] S4: The connected water stop belt 2, connecting piece 3, edge steel bar 4 and steel cage 6 are hoisted and positioned, and the water stop belt 2 is connected with the guide groove 103 on the connection head 1;

[0064] S5: The surface of the connection head 1, the water stop belt 2 and the connecting piece 3 is cleaned by the high-pressure water through the grouting cleaning pipe 5;

[0065] S6: The edge steel bar 4 and the steel cage 6 are poured to form the preliminary back abutment wall 8;

[0066] S7: The grouting cleaning pipe 5 is used to fill the non-dense part by grouting operation of the grouting machine.

[0067] The steps S1-S7 are repeated until the whole underground continuous wall operation is completed.

[0068] In the description of the present application, unless specifically defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] In the present application, unless specifically defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0070] In the description of the present embodiment, the terms "up", "down", "left", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit, and the present application is described in detail with reference to the preferred embodiments. Those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A connection structure for a diaphragm wall, characterized in that, At least including: The system comprises a connector, a waterstop, a connector, and edge sealing reinforcement. The connector is connected to the waterstop, and the connector is also connected to the waterstop. The edge sealing reinforcement has a groove corresponding to the connector, and the groove is connected to the connector. The waterstop is made of a flexible material. The connector also has a guide groove, and the waterstop is detachably connected to the guide groove. The end of the waterstop has a beveled structure, and the overlapping parts of adjacent waterstops have opposing beveled structures. The connector includes a bent structure and is made of a rigid material.

2. The connection structure of the diaphragm wall according to claim 1, characterized in that, The connector includes at least: a web and two flanges, the two flanges being arranged opposite each other and connected by the web; the edge sealing reinforcement is disposed on one side of the web, and the two ends of the edge sealing reinforcement are respectively connected to the two flanges.

3. The connection structure of the diaphragm wall according to claim 2, characterized in that, The web is set off from the side where the edge sealing reinforcement is located, with the center line of the flange as the boundary.

4. The connection structure of the diaphragm wall according to any one of claims 1 to 3, characterized in that, Also includes: A grouting and cleaning pipe is disposed between the connector and the waterstop.

5. The connection structure of the diaphragm wall according to any one of claims 1 to 3, characterized in that, The waterstop is also provided with reinforcing ribs, which are located on the connection side between the waterstop and the connector.

6. The connection structure of the diaphragm wall according to any one of claims 1 to 3, characterized in that, The surface of the connector is provided with a plating structure.

7. A construction method based on the connection structure described in any of the preceding claims, characterized in that, Includes the following steps: S1: The preliminary wall section with connector is located in the trench to be constructed, and the grouting and cleaning pipe is set in the trench to be constructed. S2: Connection between the edge sealing steel bar and the steel cage; S3: The waterstop with connectors is connected to the edge sealing steel bars; S4: Hoist and install the connected waterstop, connector, edge sealing steel bar and steel cage, and connect the waterstop to the connector; S5: The grouting cleaning pipe cleans the surfaces of the connector, the waterstop and the connector with high-pressure water; S6: Casting operation is carried out on the edge sealing steel bars and the steel cage; S7: The grouting and cleaning pipe is grouted by a grouting machine.

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