An assembled diaphragm wall and precast structure plate cone lock sleeve connecting joint and installation method

Abstract

The present application relates to underground engineering infrastructure construction technical field, specifically provide a kind of assembly diaphragm wall and prefabricated structural slab cone lock sleeve connecting node and installation method, connecting node includes assembly diaphragm wall, prefabricated structural slab, connecting reinforcement, cone lock sleeve, steel bracket, platform plate and cast-in-place concrete;Assembly diaphragm wall inside is provided reserved steel bar adapter and anchoring steel bar, connecting reinforcement is led out after through reserved steel bar adapter, is firmly connected by cone lock sleeve and the reserved steel bar of prefabricated structural slab, finally pours concrete.By cone lock sleeve adjustment assembly diaphragm wall reserved steel bar adapter and prefabricated structural slab connecting steel bar between the centering error, while ensuring that steel bar connection is reliable, construction is convenient and excellent anti-fatigue performance, realizes the quick and safe connection of assembly prefabricated structural slab and assembly diaphragm wall wallboard node, reaches node connection construction safe and reliable, fast and efficient, economic and reasonable purpose.

Description

Technical Field

[0001] This invention relates to the field of underground engineering foundation construction technology, and in particular to a prefabricated diaphragm wall and precast structural slab cone lock sleeve connection node and installation method. Background Technology

[0002] Traditional subway underground stations utilize cast-in-place reinforced concrete for both their enclosure and main structures, resulting in drawbacks such as poor waterproofing at joints, long construction periods, and significant environmental noise pollution. With the development of prefabricated construction in my country, prefabricated diaphragm walls are used for the enclosure structure, and precast slabs are used for the station roof, offering advantages such as high component quality, good wall durability, and fast construction speed. However, construction errors must be considered during the enclosure structure construction process, typically resulting in an outward expansion of several centimeters, and deformation occurs during deep foundation excavation. How to connect the precast station roof slab to the prefabricated diaphragm wall, and how to accommodate the dimensional errors between the two precast components, is a critical technical issue. On-site welding can solve the connection problem between the precast roof slab and the prefabricated diaphragm wall, but it suffers from poor site conditions, difficulty in guaranteeing welding quality, and long construction periods. Therefore, it is necessary to research a simpler, more reliable, safer, and more economical connection method for prefabricated diaphragm walls and precast slabs. Summary of the Invention

[0003] To address the issue of ensuring construction quality at the connection point between precast roof slabs and precast diaphragm walls, this invention provides a connection point and installation method for a tapered locking sleeve between a precast diaphragm wall and a precast structural slab. The technical solution adopted by the present invention to solve its technical problem is: a connection node and installation method of a prefabricated diaphragm wall and a prefabricated structural slab with a conical locking sleeve, including a prefabricated diaphragm wall and a prefabricated structural slab. The prefabricated diaphragm wall has multiple reserved steel bar connectors and multiple anchoring steel bars embedded in it. The reserved steel bar connectors are installed one-to-one at the front end of the anchoring steel bars. The prefabricated structural slab has a reserved steel bar group. One end of the reserved steel bar group is located outside the prefabricated structural slab. The reserved steel bar group of the prefabricated structural slab is fixedly connected to the multiple reserved steel bar connectors one-to-one through multiple connecting steel bars. Preferably, the reserved steel bar group includes multiple upper reserved inner steel bars, multiple upper reserved outer steel bars, and multiple lower reserved steel bars. The multiple upper reserved inner steel bars and the multiple upper reserved outer steel bars are located on the upper side of the end of the precast structural slab, and the multiple lower reserved steel bars are located on the lower side of the end of the precast structural slab. The multiple upper reserved inner steel bars, the multiple upper reserved outer steel bars, and the multiple lower reserved steel bars are respectively fixedly connected to the reserved steel bar connector one by one.

[0004] Preferably, the upper reserved outer row of reinforcing bars of the precast structural slab is aligned with the lower reserved reinforcing bars, and their vertical clearance is determined by the installation space of the cone lock sleeve and is not less than 400mm. The upper reserved outer row of reinforcing bars and the upper reserved inner row of reinforcing bars of the precast structural slab are arranged in a staggered manner.

[0005] Preferably, one end of the connecting steel bar is fixedly connected to the reserved steel bar connector in a one-to-one correspondence, and the other end of the connecting steel bar is fixedly connected to the reserved steel bar group through a cone lock sleeve.

[0006] Preferably, the conical locking sleeve includes a first conical sleeve, a second conical sleeve, a locking plate, and a retainer. The first conical sleeve is installed one-to-one with the end of the reserved rebar group, and the second conical sleeve is installed one-to-one with the end of multiple connecting rebars. The retainer is fixed between the first conical sleeve and the corresponding second conical sleeve. The middle part of the locking plate is fixed on the retainer. The two ends of the locking plate are respectively wrapped around the reserved rebar group and the connecting rebar and then inserted into the first conical sleeve and the second conical sleeve.

[0007] A method for connecting and installing prefabricated diaphragm walls and precast structural slabs with conical locking sleeves includes the aforementioned connection node between prefabricated diaphragm walls and precast structural slabs with conical locking sleeves, and further includes the following steps: S1, installing the prefabricated diaphragm wall, steel brackets, and laying platform slabs. First, the prefabricated diaphragm wall is constructed and installed along the station outline. Then, before installing the precast structural slabs, the steel brackets are fixed and the platform slabs are laid. The steel brackets are fixedly connected to the prefabricated diaphragm wall with bolts; S2, placing the precast structural slabs and conical locking sleeves. First, the precast structural slabs are placed on the platform slabs. Then, the precast structural slabs are hoisted into the foundation pit and placed on the platform slabs. The first conical sleeves of multiple conical locking sleeves are installed one-to-one on multiple diaphragm walls. S3. Install connecting steel bars; pre-deposit threads at one end of the connecting steel bar, insert the connecting steel bar into the pre-reserved steel bar connector of the prefabricated diaphragm wall through the threads, so that the connecting steel bar is reliably connected to the wall anchoring steel bar of the prefabricated diaphragm wall, and insert the other end of the connecting steel bar into the second cone sleeve of the cone lock sleeve; S4. Tighten the prefabricated structural slab, install the locking plate and retainer between the first cone sleeve and the second cone sleeve, and use clamping pliers to complete the overall tight connection of the cone lock sleeve; S5. Pour concrete, pour concrete at the connection position between the prefabricated diaphragm wall and the prefabricated structural slab to complete the wall panel node connection.

[0008] Preferably, in S4, the cone lock sleeve between the lower reserved reinforcing bar and the connecting reinforcing bar of the precast structural slab is tightened first, then the cone lock sleeve between the upper reserved inner reinforcing bar and the connecting reinforcing bar is tightened, and finally the cone lock sleeve between the upper reserved outer reinforcing bar and the connecting reinforcing bar is tightened.

[0009] As a preferred option, in S5, the prefabricated diaphragm wall, precast structural slab, and platform slab together form the side and bottom molds for concrete pouring. The steel brackets and platform slabs can only be removed after the cast-in-place concrete has been poured and reached the design strength.

[0010] The beneficial effects of this invention are as follows: First, the pre-reserved steel bar connector of the prefabricated diaphragm wall and the pre-reserved steel bar of the precast structural slab cannot be precisely aligned in space. In this application, after the connecting steel bar is extended by the pre-reserved connector, it is connected to the pre-reserved steel bar of the precast structural slab using a conical locking sleeve. This adjusts the alignment error between the prefabricated diaphragm wall pre-reserved steel bar connector and the precast structural slab pre-reserved steel bar. The in-plane adjustment error can be ±1.0D, where D is the diameter of the connecting steel bar.

[0011] Secondly, the pre-cast reinforcing bars in the precast structural slab are connected to the connecting reinforcing bars using conical locking sleeves. After the clamping clamps tighten the first and second conical sleeves on both sides, the locking plates wrap around the ribs of the reinforcing bars, ensuring a reliable connection and excellent fatigue resistance. At the wall panel joint connection points, the reinforcing bars are subjected not only to loads from the soil cover and the structure's own weight, requiring reliable connections, but also to superimposed cyclic loads from ground overload and pedestrian live loads. Therefore, the reinforcing bar connections must possess good fatigue resistance. Conical locking sleeve connections are particularly suitable for reinforcing bar connections at wall panel joints.

[0012] Thirdly, the outer row of reinforcing bars on the upper side of the precast structural slab and the inner row of reinforcing bars on the upper side are arranged in a staggered manner (202). First, tighten the conical locking sleeves between the lower reserved reinforcing bars and the connecting reinforcing bars; then tighten the conical locking sleeves between the upper reserved inner row of reinforcing bars and the connecting reinforcing bars; finally, tighten the conical locking sleeves between the upper reserved outer row of reinforcing bars and the connecting reinforcing bars. Tightening a single conical locking sleeve takes 10-20 seconds. Each diaphragm wall connects to approximately 60 joints on one side of the precast structural slab's reinforcing bars. The connection operation is expected to be completed in 15 minutes, making the node connection convenient and quick. Attached Figure Description

[0013] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0014] Figure 1 This is a flowchart of the installation method provided by the present invention; Figure 2 This is a plan view of the cone lock sleeve connection of the plate wall node in this invention; Figure 3 This is a cross-sectional view of the cone lock sleeve connection AA at the plate wall node in this invention; Figure 4 This is a cross-sectional view of the cone lock sleeve connection BB at the plate wall node in this invention; Figure 5 This is a schematic diagram of the cone lock sleeve connecting component in this invention.

[0015] Reference numerals in the attached drawings: 1. Prefabricated diaphragm wall; 101. Reserved rebar connector; 102. Anchor rebar; 2. Precast structural slab; 201. Upper reserved outer rebar; 202. Upper reserved inner rebar; 203. Lower reserved rebar; 3. Connecting rebar; 4. Conical lock sleeve; 401. First conical sleeve; 402. Locking plate; 403. Cage; 404. Second conical sleeve; 5. Steel bracket; 6. Platform slab; 7. Cast-in-place concrete; 8. Reserved rebar assembly. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] like Figures 1 to 5 As shown, this invention provides an embodiment of a prefabricated diaphragm wall and a precast structural slab cone lock sleeve connection node and installation method, including a prefabricated diaphragm wall 1 and a precast structural slab 2. Multiple pre-embedded rebar connectors 101 and multiple anchoring rebars 102 are pre-embedded in the prefabricated diaphragm wall 1. The pre-embedded rebar connectors 101 are installed one-to-one at the front end of the anchoring rebars 102. A pre-embedded rebar group 8 is provided in the precast structural slab 2, with one end of the pre-embedded rebar group 8 located outside the precast structural slab 2. The pre-embedded rebar group 8 of the precast structural slab 2 is fixedly connected to the multiple pre-embedded rebar connectors 101 one-to-one through multiple connecting rebars 3, ensuring that the tensile anchorage length of the connecting rebars 3 within the prefabricated diaphragm wall 1 meets the requirements, thus ensuring reliable connection. The reserved steel reinforcement group 8 includes multiple upper reserved inner steel reinforcements 202, multiple upper reserved outer steel reinforcements 201, and multiple lower reserved steel reinforcements 203. The multiple upper reserved inner steel reinforcements 202 and upper reserved outer steel reinforcements 201 are located on the upper side of the end of the precast structural slab 2, and the multiple lower reserved steel reinforcements 203 are located on the lower side of the end of the precast structural slab 2. The multiple upper reserved inner steel reinforcements 202, multiple upper reserved outer steel reinforcements 201, and multiple lower reserved steel reinforcements 203 are respectively fixedly connected to the reserved steel reinforcement connectors 101 one by one. The upper reserved outer steel reinforcements 201 and the lower reserved steel reinforcements 203 of the precast structural slab 2 are aligned and arranged, and their vertical clearance is determined by the installation construction space of the cone lock sleeve 4 and is not less than 400mm.

[0019] The upper reserved outer row of steel bars 201 and the upper reserved inner row of steel bars 202 are arranged in a staggered manner. This is beneficial for controlling the thickness of the precast structural slab 2 and for facilitating the installation of the cone lock sleeve 4.

[0020] One end of the connecting steel bar 3 is fixedly connected to the reserved steel bar connector 101 in a one-to-one correspondence, and the other end of the connecting steel bar 3 is fixedly connected to the reserved steel bar group 8 through the cone lock sleeve 4. This not only ensures the connection quality, but also has excellent fatigue resistance, and is especially suitable for wall panel connection nodes under cyclic load.

[0021] The cone-lock sleeve 4 includes a first cone sleeve 401, a second cone sleeve 404, a locking plate 402, and a retainer 403. The first cone sleeve 401 is installed one-to-one with the end of the reserved steel bar group 8, and the second cone sleeve 404 is installed one-to-one with the end of multiple connecting steel bars 3. The retainer 403 is fixed between the first cone sleeve 401 and its corresponding second cone sleeve 404. The middle part of the locking plate 402 is fixed on the retainer 403. The two ends of the locking plate 402 wrap around the reserved steel bar group 8 and the connecting steel bars 3 respectively, and are then inserted into the first cone sleeve 401 and the second cone sleeve 404. By wrapping the steel bar ribs with the locking plate 402, a reliable connection with the steel bars is ensured, and excellent fatigue resistance is achieved. The wall panel joint connection position is not only subjected to loads such as the backfill soil and the self-weight of the structure, but also requires reliable connection of the steel bars. At the same time, it is subjected to the superimposed cyclic load of ground overload and live load from people on the steel bars. The steel bar connection should have good fatigue resistance. Therefore, the cone-lock sleeve 4 connection in this application is particularly suitable for steel bar connection at wall panel joints.

[0022] The first cone sleeve 401, the second cone sleeve 404, and the locking piece 402 work together to adjust the alignment error between the reserved steel bar group 8, the connecting steel bar 3, and the reserved steel bar connector 101. The in-plane adjustment error can reach ±1.0D, where D is the diameter of the connecting steel bar 3, ensuring the effective connection between the prefabricated diaphragm wall 1 and the precast structural slab 2.

[0023] A method for connecting and installing a prefabricated diaphragm wall with a conical locking sleeve to a precast structural slab, comprising the aforementioned connection node of a prefabricated diaphragm wall with a conical locking sleeve to a precast structural slab, and further comprising the following steps: S1. Install the prefabricated diaphragm wall 1, steel bracket 5 and lay the platform slab 6. First, construct the prefabricated diaphragm wall 1 along the outline of the station and install it in place. Then, before installing the prefabricated structural slab 2, fix the steel bracket 5 and lay the platform slab 6. The steel bracket 5 is fixedly connected to the prefabricated diaphragm wall 1 with bolts.

[0024] S2. Place the precast structural slab 2 and the cone lock sleeve 4. First, place the precast structural slab 2 on the platform slab 6. Then, hoist the precast structural slab 2 into the foundation pit and place it on the platform slab 6. Install the first cone sleeve 401 of the multiple cone lock sleeves 4 one by one at the ends of the multiple upper reserved inner row steel bars 202, the multiple upper reserved outer row steel bars 201 and the multiple lower reserved steel bars 203.

[0025] S3. Install connecting steel bar 3; one end of connecting steel bar 3 is pre-threaded, and connecting steel bar 3 is inserted into the pre-reserved steel bar connector 101 of the prefabricated diaphragm wall 1 through the thread, so that connecting steel bar 3 is reliably connected to the wall anchoring steel bar 102 of the prefabricated diaphragm wall 1, and the other end of connecting steel bar 3 is inserted into the second cone sleeve 404 of the cone lock sleeve 4.

[0026] S4. Secure the precast structural slab 2. Install the locking plate 402 and retainer 403 between the first cone sleeve 401 and the second cone sleeve 404. After installation, use clamping pliers to complete the overall secure connection of the cone lock sleeve 4. In S4, first secure the cone lock sleeve 4 between the lower reserved steel bar 203 and the connecting steel bar 3 of the precast structural slab 2, then secure the cone lock sleeve 4 between the upper reserved inner row steel bar 202 and the connecting steel bar 3, and finally secure the cone lock sleeve 4 between the upper reserved outer row steel bar 201 and the connecting steel bar 3.

[0027] Tightening a single cone lock sleeve takes 10-20 seconds. Each diaphragm wall has approximately 60 rebar connection joints on one side, and the connection operation is expected to be completed in 15 minutes. Therefore, the node connection in this application is convenient and quick.

[0028] S5. Concrete pouring: Concrete should be poured at the connection position between the prefabricated diaphragm wall 1 and the precast structural slab 2 after the cone lock sleeve 4 connection is completed, to complete the wall panel node connection. In S5, the prefabricated diaphragm wall 1, the precast structural slab 2, and the platform slab 6 together form the concrete pouring side formwork and bottom formwork. The steel bracket 5 and the platform slab 6 can only be removed after the cast-in-place concrete 7 has been poured and reached the design strength. This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A prefabricated diaphragm wall and precast structural slab cone lock sleeve connection node, comprising a prefabricated diaphragm wall (1) and a precast structural slab (2), characterized in that: The prefabricated diaphragm wall (1) is pre-embedded with multiple reserved steel bar connectors (101) and multiple anchor steel bars (102). The reserved steel bar connectors (101) are installed one by one at the front end of the anchor steel bars (102). The prefabricated structural slab (2) is provided with a reserved steel bar group (8). One end of the reserved steel bar group (8) is located outside the prefabricated structural slab (2). The reserved steel bar group (8) of the prefabricated structural slab (2) is fixedly connected to the multiple reserved steel bar connectors (101) one by one through multiple connecting steel bars (3).

2. The prefabricated diaphragm wall and precast structural slab cone lock sleeve connection node as described in claim 1, characterized in that: The reserved steel bar group (8) includes multiple upper reserved inner row steel bars (202), multiple upper reserved outer row steel bars (201), and multiple lower reserved steel bars (203). The multiple upper reserved inner row steel bars (202) and the multiple upper reserved outer row steel bars (201) are located on the upper side of the end of the precast structural slab (2), and the multiple lower reserved steel bars (203) are located on the lower side of the end of the precast structural slab (2). The multiple upper reserved inner row steel bars (202), the multiple upper reserved outer row steel bars (201), and the multiple lower reserved steel bars (203) are respectively fixedly connected to the reserved steel bar connector (101) one by one.

3. The prefabricated diaphragm wall and precast structural slab cone lock sleeve connection node as described in claim 2, characterized in that: The upper reserved outer row of steel bars (201) and the lower reserved outer row of steel bars (203) of the precast structural slab (2) are arranged in alignment, and their vertical clearance is determined by the installation construction space of the cone lock sleeve (4) and is not less than 400mm. The upper reserved outer row of steel bars (201) and the upper reserved inner row of steel bars (202) of the precast structural slab (2) are arranged in staggered layers.

4. The prefabricated diaphragm wall and precast structural slab cone lock sleeve connection node as described in claim 2, characterized in that: One end of the connecting steel bar (3) is fixedly connected to the reserved steel bar connector (101) in a one-to-one correspondence, and the other end of the connecting steel bar (3) is fixedly connected to the reserved steel bar group (8) through a cone lock sleeve (4).

5. The prefabricated diaphragm wall and precast structural slab cone lock sleeve connection node as described in claim 3, characterized in that: The cone lock sleeve (4) includes a first cone sleeve (401), a second cone sleeve (404), a locking plate (402), and a retainer (403). The first cone sleeve (401) is installed one-to-one with the end of the reserved steel bar group (8), and the second cone sleeve (404) is installed one-to-one with the end of multiple connecting steel bars (3). The retainer (403) is fixed between the first cone sleeve (401) and the corresponding second cone sleeve (404). The middle part of the locking plate (402) is fixed on the retainer (403). The two ends of the locking plate (402) are respectively wrapped around the reserved steel bar group (8) and the connecting steel bars (3) and then inserted into the first cone sleeve (401) and the second cone sleeve (404).

6. A method for connecting and installing a prefabricated diaphragm wall with a conical locking sleeve to a precast structural slab, comprising a connection node for a prefabricated diaphragm wall with a conical locking sleeve as described in claim 5, characterized in that, It also includes the following steps: S1. Install the prefabricated diaphragm wall (1), steel bracket (5) and lay the platform plate (6). First, construct the prefabricated diaphragm wall (1) along the outline of the station and install it in place. Then, before installing the prefabricated structural plate (2), fix the steel bracket (5) and lay the platform plate (6). The steel bracket (5) is fixedly connected to the prefabricated diaphragm wall (1) by bolts. S2. Place the precast structural slab (2) and the cone lock sleeve (4). First, place the precast structural slab (2) on the platform plate (6). Then, hoist the precast structural slab (2) into the foundation pit and place it on the platform plate (6). Install the first cone sleeve (401) of the multiple cone lock sleeves (4) one by one at the ends of multiple upper reserved inner row steel bars (202), multiple upper reserved outer row steel bars (201) and multiple lower reserved steel bars (203). S3. Install connecting steel bars (3); one end of the connecting steel bar (3) is pre-threaded, and the connecting steel bar (3) is inserted into the pre-reserved steel bar connector (101) of the prefabricated diaphragm wall (1) through the thread, so that the connecting steel bar (3) is reliably connected to the wall anchoring steel bar (102) of the prefabricated diaphragm wall (1), and the other end of the connecting steel bar (3) is inserted into the second cone sleeve (404) of the cone lock sleeve (4); S4. Secure the precast structural plate (2), install the locking plate (402) and the retainer (403) between the first cone sleeve (401) and the second cone sleeve (404), and use clamping pliers to complete the overall fastening connection of the cone lock sleeve (4). S5. Pour concrete at the connection point between the prefabricated diaphragm wall (1) and the prefabricated structural slab (2) to complete the connection of the wall panel nodes.

7. The method for connecting and installing prefabricated diaphragm walls and precast structural slabs with conical locking sleeves as described in claim 6, characterized in that: In S4, first tighten the cone lock sleeve (4) between the lower reserved steel bar (203) and the connecting steel bar (3) of the precast structural slab (2), then tighten the cone lock sleeve (4) between the upper reserved inner row steel bar (202) and the connecting steel bar (3), and finally tighten the cone lock sleeve (4) between the upper reserved outer row steel bar (201) and the connecting steel bar (3).

8. The method for connecting and installing prefabricated diaphragm walls and precast structural slabs with conical locking sleeves as described in claim 1, characterized in that: In S5, the prefabricated diaphragm wall (1), the precast structural slab (2), and the platform slab (6) together form the concrete pouring side form and bottom form. The steel bracket (5) and platform slab (6) can only be removed after the cast-in-place concrete (7) has been poured and reached the design strength.

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