CN114687338A - Connecting structure of underground diaphragm wall and construction method thereof - Google Patents

Abstract

The application discloses underground continuous wall's connection structure and construction method thereof, connection structure includes at least: the connector, the water stop, the connector and the edge sealing steel bar; the connector is connected with the water stop belt, and the connecting piece is connected with the water stop belt; the edge banding reinforcing steel bar is provided with a groove which is arranged corresponding to the connecting piece, and the groove is connected with the connecting piece; the water stop is made of flexible materials. The construction method is that the first wall panel is connected with the second adjacent wall panel based on the connecting structure to form the underground continuous wall. The connection of the first wall panel and the rear adjacent wall panel is realized through the sequentially connected connectors, water stop belts, connecting pieces and edge sealing steel bars; the water stop is made of flexible materials, can adapt to the differential deformation of joints and the contraction and creep deformation of concrete, avoids the seepage path generated by the differential deformation, and further plays a role in water prevention and water stop.

Description

Connecting structure of underground diaphragm wall and construction method thereof

Technical Field

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

Background

The underground continuous wall is an underground continuous wall built by drilling and digging a groove with certain length, thickness and depth into the underground through a grooving machine under the action of wall protection slurry, placing a steel reinforcement cage in the groove after cleaning the groove, and pouring concrete and other materials in the groove. It has the functions of resisting soil body, preventing water seepage and bearing load. The underground continuous wall technology has the advantages of small vibration, low noise, high work efficiency, short construction period and the like, has small disturbance to surrounding foundations, has higher wall rigidity and is beneficial to application in urban construction. In addition, the underground continuous wall has large bearing capacity and can replace the function of the continuous wall in the traditional foundation form.

In the construction process of the underground diaphragm wall, water stopping of the connector is the most critical technical link. Connectors in the prior art are mainly divided into flexible connectors and rigid connectors. The underground continuous wall adopting the flexible connectors is not truly continuous, the flexible connectors cannot transmit bending moment, shearing force and the like, and the deformation is serious after stress; the underground diaphragm wall adopting the rigid connectors realizes the real continuity, the rigid connectors can transmit bending moment, shearing force and the like, the deformation is small after stress, and the construction is convenient. Therefore, the rigid connector is widely used in practical engineering.

However, when the underground diaphragm wall is used as a permanent structure of an underground space, the rigid connection head has the following problems: (1) because of the restriction of the current construction technology and process level, the rigid connector of the underground continuous wall, such as: the I-shaped steel connector is easy to leak due to the fact that holes are not compact in the concrete pouring process; (2) rigid connectors, such as: the I-shaped steel connector has mud skin sandwiched between the concrete and the I-shaped steel connector, and the mud skin is separated after being stressed and has leakage under the action of water pressure. Due to differential deformation, it is difficult to avoid leakage or wetness due to the presence of seepage paths.

For the leakage phenomenon at the joint of the wall panels, the prior art generally adopts a stirring pile, a jet grouting pile and the like for plugging. This treatment method can cope with only temporary retaining or water-stopping of most underground continuous walls, and is difficult to apply to permanent underground continuous walls.

Accordingly, it is desirable to provide a connection structure that can serve as a permanent underground diaphragm wall.

Disclosure of Invention

In view of the above-mentioned shortcomings or drawbacks of the prior art, the present application provides a connection structure for an underground diaphragm wall and a construction method thereof.

In order to solve the technical problem, the application is realized by the following technical scheme:

the application provides a connection structure of underground continuous wall includes at least: the connector, the water stop, the connector and the edge sealing steel bar; the connector is connected with the water stop belt, and the connecting piece is connected with the water stop belt; the edge banding reinforcing steel bar is provided with a groove which is arranged corresponding to the connecting piece, and the groove is connected with the connecting piece; the water stop is made of flexible materials.

Further, the above-mentioned connection structure of underground continuous wall, wherein, the connector includes at least: the flange plate comprises a web plate and two flange edges, wherein the two flange edges are oppositely arranged and are connected by the web plate; the edge banding reinforcing bar set up in one side of web, just the both ends of edge banding reinforcing bar respectively with two the edge of a wing is connected.

Further, in the connection structure of the underground continuous wall, the web is arranged by taking the center line of the flange as a boundary and deviating from one side provided with the edge sealing steel bar.

Further, the above-mentioned connection structure of underground continuous wall still includes wherein: grouting cleaning pipe, grouting cleaning pipe set up in the connector with between the waterstop.

Further, in the connection structure of the underground continuous wall, the connection head is further provided with a guide groove, and the water stop is detachably connected with the guide groove.

Further, in the connection structure of the underground continuous wall, the water stop belt is further provided with a reinforcing rib, and the reinforcing rib is arranged on the connection side of the water stop belt and the connector.

Further, in the connection structure of the underground continuous wall, an inclined plane structure is arranged at the end part of the water stop belt.

Further, the above-mentioned connection structure of underground continuous wall, wherein the connecting member includes: and (5) a bending structure.

Further, in the connection structure of the underground continuous wall, a plating layer structure is arranged on the surface of the connection piece.

The application also provides a construction method based on the connection structure, which comprises the following steps:

s1: the front wall with the connector is positioned in the groove to be constructed, and the grouting cleaning pipe is arranged in the groove to be constructed;

s2: the edge banding reinforcing steel bars are connected with the reinforcing cage;

s3: the connecting piece with the water stop belt is connected with the edge banding reinforcing steel bar;

s4: hoisting the connected water stop, the connecting piece, the edge banding reinforcing steel bars and the reinforcing cage, and connecting the water stop with the connector;

s5: the grouting cleaning pipe cleans the surfaces of the connector, the water stop and the connecting piece through high-pressure water;

s6: pouring the edge-sealing steel bars and the steel reinforcement cage;

s7: and the grouting cleaning pipe performs grouting operation through a grouting machine.

Compared with the prior art, the method has the following technical effects:

the connection of the first wall panel and the rear adjacent wall panel is realized through the sequentially connected connectors, water stop belts, connecting pieces and edge sealing steel bars; the water stop is made of flexible materials, can adapt to the differential deformation of joints and the contraction and creep deformation of concrete, avoids the seepage path generated by the differential deformation, and further plays a role in water prevention and water stop.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1: a cross-sectional view of an embodiment of the present application in a connection structure;

FIG. 2: the schematic diagram of the connection of the connector and the edge banding steel bar in one embodiment of the application;

FIG. 3: a cross-sectional view of the connection of the water stop and the connector in an embodiment of the application;

FIG. 4: a partial schematic view of the connection of the water stop and the connector in an embodiment of the application;

FIG. 5: a cross-sectional view a-a of the structure shown in fig. 4;

FIG. 6: a partial schematic view of a connection between a water stop and a connector in an embodiment of the application;

FIG. 7: a cross-sectional view B-B of the structure shown in FIG. 6;

FIG. 8: a schematic diagram of a connector and a grouting cleaning pipe in an embodiment of the application;

in the figure: the water stop structure comprises a connector 1, a web plate 101, a flange 102, a guide groove 103, a water stop 2, a reinforcing rib 201, a slope structure 202, a preformed hole 203, a connecting piece 3, a sealing steel bar 4, a groove 401, a grouting cleaning pipe 5, a steel reinforcement cage 6, a first wall width 7, a rear adjacent wall width 8, an earth facing side 9 and a soil backing side 10.

Detailed Description

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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, one embodiment of the present application, a connection structure for underground diaphragm walls, includes at least: the water-stop belt comprises a connector 1, a water-stop belt 2, a connecting piece 3 and an edge-sealing steel bar 4; the connector 1 is connected with the water stop 2, and the connecting piece 3 is connected with the water stop 2; the edge banding reinforcing steel bar 4 is provided with a groove 401 which is arranged corresponding to the connecting piece 3, and the groove 401 is connected with the connecting piece 3; the water stop 2 is made of flexible materials.

In this embodiment, the first side of the water stop 2 is connected to the connector 1, and the second side of the water stop 2 is connected to the connector 3, wherein the first side and the second side are opposite. Banding reinforcing bar 4 is equipped with the recess 401 that corresponds the setting with connecting piece 3, and connecting piece 3 is connected with banding reinforcing bar 4 through this recess 401. Specifically, the connecting piece 3 and the edge banding reinforcing steel bar 4 can be connected in a welding mode, or a through hole is formed in the connecting piece 3, and after the connecting piece 3 is inserted into the groove 401 of the edge banding reinforcing steel bar 4, the connecting piece 3 and the edge banding reinforcing steel bar 4 are bound together by passing through the through hole through a buckle or a steel wire so as to realize connection of the connecting piece and the edge banding reinforcing steel bar 4. The front wall width 7 and the rear adjacent wall width 8 of the underground continuous wall are connected through the connector 1, the water stop belt 2, the connecting piece 3 and the edge sealing reinforcing steel bar 4, the water stop belt 2 is made of flexible materials, and the self characteristics of the flexible materials are utilized to adapt to the difference deformation of the joint of the front wall width 7 and the rear adjacent wall width 8, the concrete shrinks and deforms slowly, the seepage diameter caused by the difference deformation is avoided, and the waterproof and water stopping effects are further achieved.

Alternatively, the water stop 2 is made of rubber material, and those skilled in the art will have an incentive to use other high molecular materials.

Specifically, the connector 1 at least includes: the flange structure comprises a web 101 and two flanges 102, wherein the two flanges 102 are oppositely arranged and are connected by the web 101; the edge-sealing reinforcing steel bar 4 is arranged on one side of the web plate 101, and two end parts of the edge-sealing reinforcing steel bar 4 are respectively connected with the two flanges 102.

In the present embodiment, the two flanges 102 are oppositely arranged and connected by the web 101; one side of the web plate 101 is connected with the front wall 7, the other side of the web plate 101 is inserted by the edge-sealing steel bar 4, and the edge-sealing steel bar 4 is connected with the flange 102 in an overlapping manner, so that the purposes of transmitting bending moment and shearing force are achieved, as shown in fig. 2. Of course, those skilled in the art will appreciate that other configurations of the connector 1 are contemplated, such as a cross-sectional configuration of the connector 1.

Specifically, the web 101 is offset from the side where the edge-sealing steel bar 4 is located, with the center line of the flange 102 as a boundary. By arranging the connector 1 in an asymmetric structure, the space between the flanges 102 is utilized, and unnecessary waste of the advanced wall frame 7 is reduced.

As shown in fig. 3, the water stop 2 is further provided with a reinforcing rib 201, and the reinforcing rib 201 is arranged on the connection side of the water stop 2 and the connector 1.

In this embodiment, the strengthening rib 201 adopts the rod iron, sets up the rod iron in the first side of waterstop 2 to avoid leading to the junction deformation of waterstop 2 and connector 1 because of adopting flexible material.

Specifically, still be equipped with guide slot 103 on the connector 1, waterstop 2 with the guide slot 103 can be dismantled and be connected. The guide groove 103 is arranged to facilitate the quick connection between the water stop band 2 and the connector 1, and also provides protection for the water stop band 2.

In this embodiment, two steel plates with L-shaped cross-section are disposed on the connecting head 1, and form a half-open guide groove 103 together with the side wall of the connecting head 1; the first side of the water stop 2 is inserted into the guide groove 103 to realize detachable connection with the connector 1; the cross section of the first side of the water stop 2 in this embodiment is square, and those skilled in the art will be motivated to configure it as triangle, circle, rectangle, or the like.

As shown in fig. 3 to 7, the end of the water stop 2 is provided with a slope structure 202.

In this embodiment, the end of the second side of the water stop 2 is provided with the inclined plane structures 202 symmetrically arranged along the central line of the cross section of the water stop 2, and as shown in fig. 2, the connecting member 3 is arranged between the two inclined plane structures 202, so that the joint of the water stop 2 and the connecting member 3 is in smooth transition, and stress concentration is avoided. In this embodiment, the end face of the third side of the water stop 2 is also provided with the slope structure 202, as shown in fig. 3 to fig. 6, because in the actual construction process, the total length of the water stop 2 and the connecting piece 3 is set according to the actual situation, for the convenience of transportation, construction and the like, the water stop 2 and the connecting piece 3 adopt the way of connection in segments, and the third side of the water stop 2, that is, the overlapped part of two adjacent segments of the water stop 2, is the slope structure 202 arranged by involution, so as to ensure that the thickness of the overlapped part of the water stop 2 is not increased, and simultaneously increase the connection area and ensure the reliability of connection. The steel bar in the first side of two adjacent sections of water stop belts 2 is also arranged in a segmented manner, a preformed hole 203 connected with the steel bar of the lower section of water stop belt 2 is reserved in the first side of the upper section of water stop belt 2, the surface of the lower section of steel bar and the inclined plane structure 202 at the lap joint are coated with a bonding agent, the lower section of steel bar is inserted into the preformed hole 203, and the bonding agent bonds the two adjacent sections of water stop belts 2 to complete connection. The lapping surfaces of the two sections of connecting pieces 3 are connected by welding.

In particular, the connection element 3 includes, but is not limited to, a bent structure. Through the setting of bending structure, provided certain deformation space, reduced the construction accuracy requirement.

Alternatively, the connecting member 3 is made of a rigid material. The connector 3 made of a rigid material is capable of providing rigidity to the second side of the waterstop 2 after being connected to the second side of the waterstop 2.

Optionally, the connecting member 3 is provided with a plating structure outside to prevent the connecting member 3 from being corroded.

In this embodiment, connecting piece 3 adopts galvanized profiled steel sheet, and one side is connected with the second side of waterstop 2, and the opposite side welds with the recess 401 of banding reinforcing bar 4, and of course, also can utilize buckle or steel wire to tie connecting piece 3 and banding reinforcing bar 4 together through setting up the through-hole on connecting piece 3.

As shown in fig. 1 and 8, the method further includes: grouting cleaning pipe 5, grouting cleaning pipe 5 set up in connector 1 with between the waterstop 2.

In the present embodiment, the number of the grouting cleaning pipes 5 is set to three, and those skilled in the art are motivated to adaptively increase or decrease the number. Specifically, three grout purge pipes 5 all set up in the web 101 one side that is equipped with waterstop 2, and wherein two grout purge pipes 5 set up respectively in the handing-over department of two edges of a wing 102 and web 101, and another grout purge pipe 5 sets up in guide slot 103. Through the arrangement, the three grouting cleaning pipes 5 can prevent the connector 1, the guide groove 103, the water stop belt 2 and the connecting piece 3 from being stained with mud skin in the construction process; meanwhile, grouting operation can be completed, so that the space between the guide groove 103 and the water stop belt 2 is tightly filled, and the concrete pouring non-tight part at the connector 1 is filled sufficiently, thereby achieving the purpose of seepage prevention.

As shown in FIG. 8, the top ends of the three grouting cleaning pipes 5 are 20-30 cm higher than the connector 1, and the bottom ends are 50-55 cm higher than the connector 1. Through the arrangement, in the construction process, the grouting cleaning pipe 5 is externally connected with a grouting machine or a high-pressure water pump.

On the other hand, the application also provides a construction method based on the connection structure, in this embodiment, the water stop 2 and the connection member 3 are already connected in a factory, and the specific construction steps are as follows:

s1: the advanced wall 7 with the connector 1 is positioned in a groove to be constructed, wherein one flange 102 of the connector 1 is abutted against the soil facing side 9, and the other flange 102 is abutted against the soil backing side 10; arranging the grouting cleaning pipe 5 in the groove to be constructed;

s2: the edge banding reinforcing steel bars 4 are welded with the reinforcing cage 6;

s3: the connecting piece 3 is connected with the groove 401 of the edge banding reinforcing steel bar 4 by welding, or a through hole is arranged on the connecting piece 3 and is connected with the edge banding reinforcing steel bar 4 by a buckle or a steel wire;

s4: according to the actual construction environment, the water stop 2 and the connecting piece 3 are lapped, so that the total length of the water stop 2 and the connecting piece 3 meets the actual requirement;

s4: hoisting the connected water stop 2, the connecting piece 3, the edge-sealing steel bar 4 and the steel reinforcement cage 6 in place, and connecting the water stop 2 with the guide groove 103 on the connector 1;

s5: the grouting cleaning pipe 5 cleans the surfaces of the connector 1, the water stop 2 and the connecting piece 3 through high-pressure water;

s6: pouring the edge-sealing steel bars 4 and the steel reinforcement cage 6 to form a primary rear adjacent wall width 8;

s7: and the grouting cleaning pipe 5 performs grouting operation through a grouting machine, so that the poured non-compact part is full.

The above steps S1 to S7 are repeated until the underground diaphragm wall work is completed in its entirety.

In the description of the present application, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.

Claims (10)

1. A connecting structure of underground diaphragm walls, characterized by comprising at least: the connector, the water stop, the connector and the edge sealing steel bar; the connector is connected with the water stop belt, and the connecting piece is connected with the water stop belt; the edge banding reinforcing steel bar is provided with a groove which is arranged corresponding to the connecting piece, and the groove is connected with the connecting piece; the water stop is made of flexible materials.

2. A connecting structure of underground continuous walls according to claim 1, wherein the connection head comprises at least: the flange plate comprises a web plate and two flange edges, wherein the two flange edges are oppositely arranged and are connected by the web plate; the edge banding reinforcing bar set up in one side of web, just the both ends of edge banding reinforcing bar respectively with two the edge of a wing is connected.

3. A connection structure of underground continuous walls according to claim 2, wherein the web is located at a position offset from a side where the edge-sealing reinforcing bars are located, with respect to a center line of the flanges.

4. A connecting structure of underground continuous walls according to any one of claims 1 to 3, further comprising: grouting cleaning pipe, grouting cleaning pipe set up in the connector with between the waterstop.

5. A connection structure of underground continuous walls according to any one of claims 1 to 3, wherein the connection head is further provided with a guide groove, and the water stop is detachably connected with the guide groove.

6. A connection structure of an underground continuous wall according to any one of claims 1 to 3, wherein the water stop is further provided with a reinforcing rib, and the reinforcing rib is provided at a connection side of the water stop and the connection head.

7. A connecting structure of underground continuous walls according to any one of claims 1 to 3, wherein the ends of the water stop strips are provided with a slope structure.

8. A connecting structure of underground continuous walls according to any one of claims 1 to 3, wherein the connecting member comprises: and (5) a bending structure.

9. A connection structure of underground continuous walls according to any one of claims 1 to 3, wherein the surface of the connection member is provided with a plating structure.

10. A construction method based on the connection structure of any one of the preceding claims, characterized by comprising the steps of:

s1: the front wall with the connector is positioned in the groove to be constructed, and the grouting cleaning pipe is arranged in the groove to be constructed;

s2: the edge banding reinforcing steel bars are connected with the reinforcing cage;

s3: the water stop belt with the connecting piece is connected with the edge banding reinforcing steel bar;

s4: hoisting the connected water stop, the connecting piece, the edge banding reinforcing steel bars and the reinforcing cage, and connecting the water stop with the connector;

s5: the grouting cleaning pipe cleans the surfaces of the connector, the water stop and the connecting piece through high-pressure water;

s6: pouring the edge-sealing steel bars and the steel reinforcement cage;

s7: and the grouting cleaning pipe performs grouting operation through a grouting machine.

Images