Underground diaphragm wall joint waterproof structure and underground diaphragm wall construction method

Abstract

The invention discloses an underground diaphragm wall joint waterproof structure and a construction method of an underground diaphragm wall, and the underground diaphragm wall joint waterproof structure comprises I-shaped steel, a plurality of groups of butt joint assemblies and two groups of waterproof assemblies; the I-shaped steel is arranged between two adjacent underground diaphragm walls; the butt joint assemblies are installed between the I-shaped steel and a reinforcement cage of the underground diaphragm wall. The waterproof assemblies are arranged on the outer sides of the two adjacent underground diaphragm walls correspondingly and are in contact fit with the I-shaped steel. The two adjacent underground diaphragm walls are connected through the I-shaped steel, so that the situation that when the two underground diaphragm walls are poured in different periods, a connecting seam is generated is avoided; in addition, through the arrangement of the butt joint assembly, the contact surface of the I-shaped steel and the concrete can be blocked, and the phenomenon of water seepage caused by butt joints due to inconsistent materials of the concrete and the I-shaped steel is prevented; and through the arrangement of the waterproof assembly, a sealing effect can be formed between the waterproof assembly and the I-shaped steel, and the water seepage phenomenon of the joints of the underground diaphragm wall is further prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a waterproof structure for joints of diaphragm walls and a construction method for diaphragm walls. Background Art

[0002] Diaphragm walls belong to underground concealed works, and are continuous reinforced concrete walls built underground as water cut-off, anti-seepage, load-bearing, and water retaining structures.

[0003] The construction process of diaphragm walls generally adopts the method of segmental trench excavation and segmental pouring. Therefore, joints between each construction segment, that is, construction joints, will inevitably occur during the construction process. The existence of construction joints provides a channel for groundwater leakage in water-rich strata; especially in the construction in coastal areas, due to the large number and relatively thick thickness of water-rich sand layers, higher requirements for waterproof measures for foundation pits are required; under the action of high water pressure in water-rich areas, due to the existence of construction joints in the retaining structure, the foundation pit of the subway station is extremely prone to leakage.

[0004] Therefore, there is an urgent need to provide a waterproof structure for joints of diaphragm walls and a construction method for diaphragm walls to solve the technical problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a waterproof structure for joints of diaphragm walls and a construction method for diaphragm walls to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the present invention provides a waterproof structure for joints of diaphragm walls, including:

[0007] I-beams, arranged between adjacent diaphragm walls;

[0008] Multiple sets of docking components, respectively installed in two grooves of the I-beam, and the ends of the docking components are fixedly connected to the steel reinforcement cages of the diaphragm walls;

[0009] Two sets of waterproof components, respectively arranged on the outer sides of adjacent diaphragm walls, one end of the waterproof component is fixedly connected to the steel reinforcement cage of the diaphragm wall, and the other end of the waterproof component is in contact and cooperation with the I-beam.

[0010] Preferably, the docking component includes:

[0011] A guiding groove, fixedly connected to the I-beam, and the guiding groove is arranged along the length direction of the I-beam;

[0012] A connecting block, one end of the connecting block is fixedly connected to the steel reinforcement cage of the diaphragm wall, and the other end of the connecting block is slidably installed in the guiding groove;

[0013] An elastic gasket, the elastic gasket is located in the guide groove, and the elastic gasket is fixedly connected to the connecting block.

[0014] Preferably, the length of the connecting block extending into the guide groove is not less than one-third of the depth of the guide groove.

[0015] Preferably, the elastic gasket is a rubber gasket, and the rubber gasket is fixed on the connecting block by screws.

[0016] Preferably, the waterproof component includes an L-shaped connecting plate, one end of the L-shaped connecting plate is fixedly connected to the steel reinforcement cage of the diaphragm wall, and a sealing strip is fixedly connected to the other end of the L-shaped connecting plate, and the sealing strip is in contact and cooperation with the outer wall of the I-beam.

[0017] Preferably, the sealing strip is a water-swellable waterstop strip.

[0018] A construction method of a diaphragm wall includes the following steps:

[0019] S1. Construct a guide wall, and the depth of the guide wall is not less than 1.5 m;

[0020] S2. Excavate a groove hole that meets the design requirements of the diaphragm wall under the condition of slurry support, and the verticality deviation of the groove hole after grooving is not greater than 1 / 300;

[0021] S3. After the groove hole reaches the design depth, carry out bottom cleaning work;

[0022] S4. Hoist and place the steel reinforcement cage. Among them, the processing process of the steel reinforcement cage is carried out during the grooving of the groove hole;

[0023] S5. Adopt the conduit method to carry out underwater concrete pouring. During the pouring process, the pouring speed is not less than 3 m / h, and the overpouring height is not less than 0.5 m;

[0024] S6. Repeat the operations of S2 to S5 to construct another diaphragm wall;

[0025] S7. Carry out jet grouting pile construction on the outside of the joint of two diaphragm walls. The diameter of the jet grouting pile is not less than 600 mm, and the depth of the jet grouting pile is the same as the depth of the diaphragm wall.

[0026] Preferably, in S2, the slurry raw materials are selected as bentonite, soda ash and CMC. Among them, the bentonite content is not less than 8%; the viscosity of the slurry is 25-30 S, and the sand content of the slurry is not greater than 4%.

[0027] Preferably, if there is a gravel sand layer at the groove hole excavation position, before step S2, a cement mixing pile is used to reinforce the soil body.

[0028] Preferably, the processing process of the steel reinforcement cage includes:

[0029] S21. Processing of the main body of the steel reinforcement cage;

[0030] S22. Processing of the waterproof structure at the joint of the diaphragm wall; wherein, the installation positions of the I-beams include the following methods:

[0031] a. The I-beams are arranged on both sides of the main body of the steel reinforcement cage;

[0032] b. The I-beams are arranged on one side of the main body of the steel reinforcement cage;

[0033] c. No I-beams are arranged on both sides of the main body of the steel reinforcement cage.

[0034] Compared with the prior art, the present invention has the following advantages and technical effects:

[0035] In the present invention, adjacent diaphragm walls are connected by I-beams. When the diaphragm wall is poured, the contact between the concrete and the I-beams can avoid the generation of joints when the two diaphragm walls are poured in different time periods. In addition, through the setting of the docking component, a barrier can be formed on the contact surface between the I-beam and the concrete, preventing water seepage caused by the docking joint due to inconsistent materials between the concrete and the I-beam. Moreover, through the setting of the waterproof component, a sealing effect can be formed with the I-beam, further preventing the occurrence of water seepage at the joint of the diaphragm wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is a schematic structural diagram of the waterproof structure at the joint of the diaphragm wall of the present invention;

[0038] In the figure: 1. Diaphragm wall; 2. I-beam; 3. Steel reinforcement cage; 4. Guide groove; 5. Connecting block; 6. Elastic sealing gasket; 7. L-shaped connecting plate; 8. Sealing strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] As Figure 1 shown, the present invention provides a waterproof structure for the joints of diaphragm walls, comprising:

[0041] An I-beam 2, disposed between two adjacent diaphragm walls 1;

[0042] Multiple docking components, respectively installed in two grooves of the I-beam 2, and the ends of the docking components are fixedly connected to the reinforcement cage 3 of the diaphragm wall 1;

[0043] Two waterproof components, respectively disposed on the outer sides of two adjacent diaphragm walls 1, one end of the waterproof component is fixedly connected to the reinforcement cage 3 of the diaphragm wall 1, and the other end of the waterproof component is in contact and cooperation with the I-beam 2.

[0044] In the present invention, two adjacent diaphragm walls 1 are connected by the I-beam 2. When the diaphragm wall 1 is poured, the contact between the concrete and the I-beam 2 can avoid the generation of a joint when the two diaphragm walls 1 are poured in different time periods; in addition, through the arrangement of the docking components, a barrier can be formed on the contact surface between the I-beam 2 and the concrete, preventing water seepage caused by the docking joint due to inconsistent materials between the concrete and the I-beam 2; moreover, through the arrangement of the waterproof components, a sealing effect can be formed with the I-beam 2, further preventing the occurrence of water seepage at the joints of the diaphragm wall 1.

[0045] Further optimized solution, the docking component includes:

[0046] A guiding groove 4, fixedly connected to the I-beam 2, and the guiding groove 4 is arranged along the length direction of the I-beam 2;

[0047] A connecting block 5, one end of the connecting block 5 is fixedly connected to the reinforcement cage 3 of the diaphragm wall 1, and the other end of the connecting block 5 is slidably installed in the guiding groove 4;

[0048] An elastic sealing gasket 6, located in the guiding groove 4, and the elastic sealing gasket 6 is fixedly connected to the connecting block 5.

[0049] When the reinforcement cage 3 is docked with the I-beam 2, the arrangement of the guiding groove 4 and the connecting block 5 can not only limit the position of the reinforcement cage 3 to ensure that the position of the reinforcement cage 3 will not shift, but also make the reinforcement cage 3 and the I-beam 2 better docked by using the guiding groove 4 and the connecting block 5. Thus, when a docking joint appears between the concrete and the I-beam 2, a blocking effect can be formed by using the guiding groove 4 and the connecting block 5 to block the docking joint; and the arrangement of the elastic sealing gasket 6 can ensure the sealing effect between the connecting block 5 and the guiding groove 4.

[0050] Further optimized solution, the length of the connecting block 5 extending into the guiding groove 4 is not less than one-third of the depth of the guiding groove 4.

[0051] According to a further optimized solution, the elastic sealing pad 6 is a rubber pad, and the rubber pad is fixed to the connecting block 5 by screws.

[0052] A further optimized solution is that the waterproof component includes an L-shaped connecting plate 7, one end of the L-shaped connecting plate 7 is fixedly connected to the steel cage 3 of the underground continuous wall 1, and the other end of the L-shaped connecting plate 7 is fixedly connected to a sealing strip 8, which is in contact with the outer wall of the I-beam 2.

[0053] The sealing strip 8 is in a compressed state in the initial state, which prevents the sealing strip 8 from being separated from the I-beam 2 due to the force applied to the L-shaped connecting plate 7 after the concrete is poured. The setting of the sealing strip 8 can further prevent the continuity of the butt joint between the concrete and the I-beam 2 after the butt joint is generated, thereby achieving a waterproof effect from an external source.

[0054] According to a further optimization scheme, the sealing strip 8 is a water-swellable water-stop strip.

[0055] A construction method for an underground continuous wall comprises the following steps:

[0056] S1. Build a guide wall with a depth of no less than 1.5m;

[0057] S2. Excavate slots that meet the design requirements of underground continuous wall 1 under the condition of mud wall protection, and the verticality deviation of the slots after forming shall not exceed 1 / 300;

[0058] S3. After the slot reaches the designed depth, clean the bottom;

[0059] S4, hanging and placing the steel cage 3, wherein the processing process of the steel cage 3 is carried out during the slotting process;

[0060] S5. Use the conduit method for underwater concrete pouring. During the pouring process, the pouring speed shall not be less than 3m / h and the over-pouring height shall not be less than 0.5m;

[0061] S6, repeat the operations of S2 to S5 to construct another underground continuous wall 1;

[0062] S7. Carry out jet grouting pile construction on the outside of the joint between the two underground continuous walls 1. The diameter of the jet grouting pile shall not be less than 600 mm, and the depth of the jet grouting pile shall be consistent with the depth of the underground continuous wall 1.

[0063] To further optimize the scheme, in S2, the mud raw materials are bentonite, soda ash and CMC, among which the bentonite content is not less than 8%; the viscosity of the mud is 25-30S, and the sand content of the mud is not more than 4%.

[0064] To further optimize the solution, if there is a gravel and sand layer at the slot excavation location, cement mixing piles are used to reinforce the soil before step S2.

[0065] Further optimization scheme, the processing process of the steel cage 3 includes:

[0066] S21. Processing of the main body of the steel cage;

[0067] S22, processing of underground continuous wall joint waterproof structure; wherein, the setting position of I-beam 2 includes the following methods:

[0068] a. I-beams 2 are arranged on both sides of the main body of the steel cage; the steel cage 3 processed in this way is suitable for when the underground continuous wall 1 is not poured on both sides, and when the steel cage 3 is hoisted, the steel cage 3 is directly hoisted;

[0069] b. The I-beam 2 is arranged on one side of the main body of the steel cage; the steel cage 3 processed in this way is suitable for a continuous underground wall 1 that has been cast, and the continuous underground wall 1 has the I-beam 2. At this time, when the steel cage 3 is suspended, the connecting block 5 on the side of the steel cage 3 where the I-beam 2 is not arranged needs to be connected with the guide groove 4 on the I-beam 2 on the cast continuous underground wall 1;

[0070] c. No I-beams 2 are set on both sides of the steel cage body. The steel cage 3 processed in this way is suitable for pouring underground continuous walls 1 on both sides, and both sides are equipped with I-beams 2. At this time, when the steel cage 3 is hung, the connecting blocks 5 on the steel cage 3 need to be connected with the guide grooves 4 on the I-beams 2 on both sides.

[0071] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An underground continuous wall joint waterproof structure, characterized in that: include: An I-beam (2) is arranged between two adjacent underground continuous walls (1); A plurality of docking assemblies are respectively installed in the two grooves of the I-beam (2), and the ends of the docking assemblies are fixedly connected to the steel cage (3) of the underground continuous wall (1); Two groups of waterproof components are respectively arranged on the outside of two adjacent underground continuous walls (1), one end of the waterproof component is fixedly connected to the steel cage (3) of the underground continuous wall (1), and the other end of the waterproof component is in contact with the I-beam (2).

2. The underground continuous wall joint waterproof structure according to claim 2 is characterized in that: The docking assembly comprises: A guide groove (4), wherein the guide groove (4) is fixedly connected to the I-beam (2), and the guide groove (4) is arranged along the length direction of the I-beam (2); A connecting block (5), one end of which is fixedly connected to the steel cage (3) of the underground continuous wall (1), and the other end of which is slidably mounted in the guide groove (4); An elastic sealing pad (6), wherein the elastic sealing pad (6) is located in the guide groove (4), and the elastic sealing pad (6) is fixedly connected to the connecting block (5).

3. The underground continuous wall joint waterproof structure according to claim 2, characterized in that: The length of the connecting block (5) extending into the guide groove (4) is not less than one third of the depth of the guide groove (4).

4. The underground continuous wall joint waterproof structure according to claim 2, characterized in that: The elastic sealing pad (6) is a rubber pad, and the rubber pad is fixed to the connecting block (5) by means of screws.

5. The underground continuous wall joint waterproof structure according to claim 1, characterized in that: The waterproof component comprises an L-shaped connecting plate (7), one end of which is fixedly connected to the steel cage (3) of the underground continuous wall (1), and the other end of which is fixedly connected to a sealing strip (8), and the sealing strip (8) is in contact with the outer wall of the I-beam (2).

6. The underground continuous wall joint waterproof structure according to claim 5, characterized in that: The sealing strip (8) is a water-stop strip that swells when exposed to water.

7. A construction method for an underground continuous wall, characterized in that: The following steps are involved: S1. Build a guide wall with a depth of no less than 1.5m; S2. Excavating a slot that meets the design requirements of the underground continuous wall (1) under the condition of mud wall protection, and the verticality deviation of the slot after the slot is formed is not greater than 1 / 300; S3. After the slot reaches the designed depth, clean the bottom; S4, hanging and placing the steel cage (3), wherein the processing of the steel cage (3) is carried out during the slotting process; S5. Use the conduit method for underwater concrete pouring. During the pouring process, the pouring speed shall not be less than 3m / h and the over-pouring height shall not be less than 0.5m; S6, repeat the operations of S2 to S5 to construct another underground continuous wall (1); S7. Jet grouting piles are constructed on the outside of the joint between the two underground continuous walls (1). The diameter of the jet grouting piles is not less than 600 mm, and the depth of the jet grouting piles is consistent with the depth of the underground continuous wall (1).

8. The construction method of underground continuous wall according to claim 7, characterized in that: In the S2, the mud raw materials are bentonite, soda ash and CMC, wherein the bentonite content is not less than 8%; the viscosity of the mud is 25-30S, and the sand content of the mud is not more than 4%.

9. The construction method of underground continuous wall according to claim 7, characterized in that: If there is a gravel-sand layer at the slot excavation location, cement mixing piles are used to reinforce the soil before step S2.

10. The construction method of underground continuous wall according to claim 7, characterized in that: The processing of the steel cage (3) comprises: S21. Processing of the main body of the steel cage; S22. Processing of the underground continuous wall joint waterproof structure according to any one of claims 1 to 6; wherein the setting position of the I-beam (2) includes the following methods: a. I-beams (2) are arranged on both sides of the main body of the steel cage; b. The I-beam (2) is arranged on one side of the main body of the steel cage; c. No I-beams (2) are provided on either side of the main body of the steel cage.

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