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

A connection structure of an underground continuous wall and its construction method

technical field

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

Background technique

The underground diaphragm wall is constructed by drilling a groove with a certain length, thickness and depth into the ground by means of the groove forming machine and the action of the retaining wall mud. into an underground continuous wall. It has the functions of resisting soil, preventing water seepage and bearing load. The underground diaphragm wall technology has the advantages of small vibration, low noise, high work efficiency, and fast construction period. In addition, the bearing capacity of the underground diaphragm wall is large, which can replace the function of the diaphragm wall in the traditional foundation form.

In the construction process of the underground diaphragm wall, the water stop of the joint is the most critical technical link. Connectors in the prior art are mainly divided into flexible connectors and rigid connectors. The underground diaphragm wall with flexible joints is not truly continuous, and the flexible joints cannot transmit bending moments, shear forces, etc., and the deformation is serious after being stressed; The rigid joint can transmit bending moment, shear force, etc., and the deformation is small after being stressed, and the construction is convenient. Therefore, rigid connectors are widely used in practical engineering.

However, when the underground diaphragm wall is used as the permanent structure of the underground space, the rigid connector also has the following problems: (1) Due to the limitation of the current construction technology and technological level, the rigid connector of the underground diaphragm wall, such as: I-beam connector (2) Rigid joints, such as I-beam joints, because the mud flows around and adheres to its surface, the concrete poured after pouring is not close to the surface. The mud skin is sandwiched between the I-beam joints. After being stressed, the mud skin is detached, and leakage occurs under the pressure of water. Due to differential deformation, it is difficult to avoid leakage or moisture caused by seepage diameter.

For the leakage phenomenon at the joints of the wall, in the prior art, stirring piles, rotary jetting piles, etc. are usually used to block the leakage. This treatment method can only deal with the temporary earth retaining or water blocking of most underground diaphragm walls, and it is difficult to apply to permanent underground diaphragm walls.

Therefore, there is an urgent need to provide a connecting structure that can be used as a permanent underground diaphragm wall.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings or deficiencies of the prior art, the technical problem to be solved by the present application is to provide a connection structure and a construction method for an underground continuous wall.

In order to solve the above-mentioned technical problems, the application realizes through the following technical solutions:

The present application proposes a connection structure for an underground continuous wall, which at least includes: a connecting head, a water stop, a connecting piece and an edge-sealing steel bar; the connecting head is connected with the water stop, and the connecting piece is connected with the stop The water belt is connected; the edge-sealing steel bar is provided with a groove corresponding to the connecting piece, and the groove is connected with the connecting piece; the water stop belt is made of flexible material.

Further, in the connection structure of the above-mentioned underground continuous wall, wherein the connecting head at least comprises: a web and two flanges, the two flanges are arranged opposite to each other and are connected by the web; the edge-sealing steel bars It is arranged on one side of the web, and the two ends of the edge-sealing reinforcement are respectively connected with the two flanges.

Further, in the connection structure of the above-mentioned underground continuous wall, wherein the web is bounded by the center line of the flange, and is arranged deviating from the side where the edge-sealing reinforcement is provided.

Further, the connection structure of the above-mentioned underground diaphragm wall further comprises: a grouting cleaning pipe, and the grouting cleaning pipe is arranged between the connecting head and the water stop belt.

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

Further, in the connection structure of the above-mentioned underground continuous wall, the water stop is further provided with a reinforcing rib, and the reinforcing rib is arranged on the connection side of the water stop and the connecting head.

Further, in the connection structure of the above-mentioned underground continuous wall, the end portion of the water stop is provided with an inclined surface structure.

Further, in the above-mentioned connecting structure of an underground continuous wall, the connecting member includes a bending structure.

Further, in the connection structure of the above-mentioned underground continuous wall, the surface of the connection piece is provided with a coating structure.

The application also proposes a construction method based on the above-mentioned connection structure, comprising the following steps:

S1: The leading wall panel with the connector is located in the trench to be constructed, and the grouting cleaning pipe is arranged in the trench to be constructed;

S2: The edge banding steel bar is connected to the steel bar cage;

S3: The connecting piece with the waterstop is connected to the edge-sealing steel bar;

S4: hoisting and connecting the waterstop, the connector, the edge-sealing steel bar and the reinforcing cage, and connect the waterstop to the connector;

S5: the grouting cleaning pipe uses high-pressure water to clean the surface of the connector, the water stop and the connector;

S6: pouring the edge-sealing reinforcement and the reinforcement cage;

S7: The grouting cleaning pipe is grouted by a grouting machine.

Compared with the prior art, the present application has the following technical effects:

The present application realizes the connection between the leading wall panel and the rear adjacent wall panel by connecting the connecting head, the water stop belt, the connecting piece and the edge-sealing reinforcement in sequence; , Creep deformation, avoid the seepage diameter caused by differential deformation, and then play the role of waterproof and water stop.

Description of drawings

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

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

Figure 2: a schematic diagram of the connection between the connector and the edge-sealing steel bar in an embodiment of the present application;

Figure 3: a schematic cross-sectional view of the connection between the waterstop and the connector in an embodiment of the present application;

Figure 4: A partial schematic diagram of the connection between the waterstop and the connector in an embodiment of the present application;

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

Figure 6: A partial schematic diagram of the connection between the waterstop and the connector in an embodiment of the present application;

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

Figure 8: A schematic diagram of a connector and a grouting cleaning pipe in an embodiment of the present application;

In the figure: connector 1, web 101, flange 102, guide groove 103, water stop 2, reinforcing rib 201, inclined surface structure 202, reserved hole 203, connector 3, edge-sealing steel bar 4, groove 401, The grouting cleaning pipe 5, the reinforcement cage 6, the leading wall width 7, the rear adjacent wall width 8, the soil facing side 9 and the back soil side 10.

Detailed ways

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 a 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 of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

As shown in FIG. 1, one of the embodiments of the present application, a connection structure of an underground diaphragm 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 and the The water stop belt 2 is connected, and the connecting piece 3 is connected with the water stop belt 2; The connecting piece 3 is connected; the water stop belt 2 is made of flexible material.

In this embodiment, the first side of the waterstop 2 is connected to the connecting head 1 , and the second side of the waterstop 2 is connected to the connecting piece 3 , wherein the first side and the second side are arranged opposite to each other. The edge-sealing steel bar 4 is provided with a groove 401 corresponding to the connecting piece 3 , and the connecting piece 3 is connected to the edge-sealing steel bar 4 through the groove 401 . Specifically, the connecting piece 3 can be connected to the edge-sealing steel bar 4 by welding, 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 is inserted through a buckle or a steel wire Through the through hole, the connecting piece 3 and the edge-sealing steel bar 4 are bound together to realize the connection between the two. The leading wall 7 of the underground diaphragm wall is connected with the rear adjacent wall 8 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 flexible material, and the own characteristics of the flexible material are used. , which can adapt to the differential deformation of the connection between the leading wall 7 and the rear adjacent wall 8, and the concrete shrinks and creeps to avoid the seepage caused by the differential deformation, thereby playing the role of waterproof and water-stop.

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

Specifically, the connector 1 at least includes: a web 101 and two flanges 102, the two flanges 102 are arranged opposite to each other and are connected by the web 101; the edge-sealing reinforcement 4 is arranged on the web One side of the plate 101 , and the two ends of the edge-sealing steel bar 4 are respectively connected with the two flanges 102 .

In this embodiment, the two flanges 102 are arranged opposite to each other and are connected by the web 101; one side of the web 101 is connected with the preceding wall panel 7, and the other side of the web 101 is inserted by the edge-sealing steel bar 4, and the edge-sealing steel bar is inserted. 4 is lapped and connected with the flange 102, so as to achieve the purpose of transmitting bending moment and shear force, as shown in FIG. 2 . Of course, those skilled in the art are motivated to use the connecting head 1 of other structures, such as the connecting head 1 having a cross-shaped structure in cross section.

Specifically, the web 101 is bounded by the center line of the flange 102, and is provided away from the side where the edge-sealing steel bar 4 is provided. By setting the connecting head 1 as an asymmetric structure, it is beneficial to the space utilization between the flanges 102 and the unnecessary waste of the leading wall panel 7 is reduced.

As shown in FIG. 3 , the waterstop 2 is further provided with a reinforcing rib 201 , and the reinforcing rib 201 is arranged on the connection side of the waterstop 2 and the connecting head 1 .

In this embodiment, the reinforcing rib 201 is made of steel rods, and the steel rods are arranged in the first side of the waterstop 2 to avoid deformation of the connection between the waterstop 2 and the connector 1 due to the use of flexible materials.

Specifically, the connecting head 1 is further provided with a guide groove 103 , and the water stop band 2 is detachably connected to the guide groove 103 . By arranging the guide groove 103 to facilitate the quick connection of the waterstop 2 with the connector 1 , the waterstop 2 also provides protection.

In this embodiment, two steel plates with an L-shaped cross-section are arranged, and the two are oppositely arranged on the connecting head 1 to form a semi-open guide groove 103 together with the side wall of the connecting head 1; The first side is inserted into the guide groove 103 to realize the detachable connection with the connector 1; shape or rectangle etc.

As shown in FIG. 3 to FIG. 7 , the end portion of the water stop 2 is provided with an inclined surface structure 202 .

In the present embodiment, the end of the second side of the water stop 2 is provided with an inclined surface structure 202 symmetrically arranged along the center line of the cross section of the water stop 2. As shown in FIG. 2, the connector 3 is arranged on two inclined surfaces. Between the structures 202, a smooth transition is made at the connection between the water stop 2 and the connecting piece 3 to avoid stress concentration. In this embodiment, the end face of the third side of the water stop 2 is also provided with a slope structure 202, as shown in Figs. According to the actual situation, in order to facilitate transportation and construction, the waterstop 2 and the connector 3 are connected in sections. The third side of the waterstop 2 is the part where two adjacent sections of the waterstop 2 overlap. The inclined surface structure 202 is arranged to match, so as to ensure that the thickness of the overlapped portion of the water stop belt 2 does not increase, and at the same time, the connection area is enlarged to ensure the reliability of the connection. The steel bars in the first sides of the two adjacent waterstops 2 are also arranged in sections, and there are reserved holes 203 connected with the steel bars of the lower waterstops 2 in the first side of the upper waterstop 2. The surface of the lower steel bar and the inclined surface structure 202 at the lap joint are coated with adhesive, the lower steel bar is inserted into the reserved hole 203, and the adhesive bonds the two adjacent waterstops 2 to complete the connection. The overlapping surfaces of the two connecting pieces 3 are connected by welding.

Specifically, the connector 3 includes, but is not limited to, a bending structure. Through the setting of the bending structure, a certain deformation space is provided, and the construction accuracy requirements are reduced.

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

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

In this embodiment, the connecting member 3 is made of galvanized profiled steel plate, one side is connected with the second side of the water stop 2, and the other side is welded with the groove 401 of the edge-sealing steel bar 4. Of course, it can also be connected by A through hole is provided on the piece 3, and the connecting piece 3 and the edge-sealing steel bar 4 are bound together by means of a buckle or a steel wire.

As shown in FIG. 1 and FIG. 8 , it further includes: a grouting cleaning pipe 5 , and the grouting cleaning pipe 5 is arranged between the connecting head 1 and the water stop belt 2 .

In this embodiment, the number of grouting cleaning pipes 5 is set to three, and those skilled in the art have the motivation to adjust the number of grouting cleaning pipes 5 to increase or decrease adaptively. Specifically, the three grouting cleaning pipes 5 are all arranged on the side of the web 101 where the waterstop 2 is provided, wherein the two grouting cleaning pipes 5 are respectively arranged at the junctions of the two flanges 102 and the web 101 , and the other one is The grouting cleaning pipe 5 is arranged in the guide groove 103 . Through the above arrangement, the three grouting cleaning pipes 5 can prevent the connecting head 1, the guide groove 103, the water stop belt 2 and the connecting piece 3 from being stained with mud during the construction process; at the same time, the grouting operation can be completed, so that the guide groove 103 and The waterstops 2 are filled densely, and the non-dense parts of the concrete pouring at the joint 1 are filled with supplements, so as to achieve the purpose of anti-seepage.

As shown in FIG. 8 , the tops of the three grouting cleaning pipes 5 are respectively 20-30 cm higher than the connector 1 , and the bottom ends are also 50-55 cm higher than the connector 1 . Through the above arrangement, it is convenient for the grouting cleaning pipe 5 to be connected to a grouting machine or a high-pressure water pump during the construction process.

On the other hand, the present application also proposes a construction method based on the above-mentioned connection structure. In this embodiment, the waterstop 2 and the connector 3 have been connected in the factory, and the specific construction steps are as follows:

S1: The leading wall panel 7 with the connecting head 1 is located in the trench to be constructed, wherein one flange 102 of the connecting head 1 is in contact with the soil-facing side 9, and the other flange 102 is in contact with the back soil side 10; the grouting The cleaning pipe 5 is arranged in the trench to be constructed;

S2: Welding the edge banding steel bar 4 and the steel bar cage 6;

S3: The connecting piece 3 is connected to the groove 401 of the edge-sealing steel bar 4 by welding, or, a through hole is provided on the connecting piece 3 and is connected to the edge-sealing steel bar 4 through a buckle or a steel wire;

S4: According to the actual construction environment, overlap the waterstop 2 and the connecting piece 3, so that the total length of the waterstop 2 and the connecting piece 3 meets the actual needs;

S4: Hoist the connected waterstop 2, connector 3, edge-sealing steel bar 4 and steel cage 6 in place, and connect the waterstop 2 to the guide groove 103 on the connector 1;

S5: The grouting cleaning pipe 5 cleans the surfaces of the connecting head 1, the water stop belt 2 and the connecting piece 3 through high-pressure water;

S6: pouring the edge-sealing reinforcement bars 4 and reinforcement cages 6 to form a preliminary rear adjacent wall width 8;

S7: The grouting cleaning pipe 5 is grouted by the grouting machine, so that the pouring is not compacted.

Repeat the above steps S1 to S7 until all underground diaphragm wall operations are completed.

In the description of this application, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In this application, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms “upper”, “lower”, “left”, “right”, etc. are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplified operation , rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation on the present application. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. The present application is described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that the technical solutions of the present application may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application, and should be covered within the scope of the claims of the present application.

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.

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