Subway station foundation pit temporary bottom plate anti-floating hinge point under high water level environment

Abstract

The utility model relates to an anti-floating hinge point for a temporary bottom plate of a subway station foundation pit in a high water level environment, which comprises a convex part arranged on an underground diaphragm wall and a groove part arranged on the temporary bottom plate, the convex part is matched with the groove part, a felt is arranged between the contact surfaces of the temporary bottom plate and the underground diaphragm wall, and the convex part is matched with the groove part. A water stop belt is arranged between the vertical contact faces of the protruding part and the groove part, a concrete cushion layer is arranged at the bottom of the temporary bottom plate, and waterproof plates are arranged between the concrete cushion layer and the contact faces of the inner side of the underground diaphragm wall and the bottom of the temporary bottom plate. The utility model has the characteristics of short construction period, low cost and simple process, and is easy to ensure the construction quality.

Description

Technical Field

[0001] The utility model relates to the technical field of subway station construction, in particular to an anti-floating hinge point of a temporary bottom plate of a subway station foundation pit under a high water level environment. Background Art

[0002] With the acceleration of urbanization, subways, as an important part of urban transportation, are increasingly being built. However, subway station construction in high water levels often faces the problems of continuous precipitation and anti-floating of the foundation pit floor. In particular, after the temporary floor of the station outer box is built, it takes a long time to start the construction of the main structure of the station. In this case, it is unrealistic to rely on continuous precipitation, and the anti-floating design of the foundation pit floor has become a solution to this problem.

[0003] Regarding the anti-floating design of temporary floor slabs in subway station foundation pits, the anti-floating reinforcement measures for subway station floor slabs in China are mainly divided into two categories. One is to use anti-pullout piles, anti-floating anchor rods, or measures to increase counterweights in conjunction with them. These measures have high construction costs and complex procedures. They are difficult to implement under the condition of a shallow underlying pressure water layer. There is a risk of penetrating the pressure water layer and the possibility of insufficient anti-floating bearing capacity due to the anti-pullout length not meeting the requirements. The other is to plant reinforcement on the inner wall of the underground continuous wall to form a rigid node between the temporary floor slab and the underground continuous wall. The construction quality of the planting reinforcement is high, and the temporary floor slab is subjected to a large bending moment at the node under the action of buoyancy, and tensile cracks are easily formed at the node, resulting in waterproof failure. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and provide an anti-floating hinge point for a temporary bottom plate of a foundation pit of a subway station in a high water level environment.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an anti-floating hinge point of a temporary floor slab of a subway station foundation pit under a high water level environment, comprising a raised portion arranged on a ground-connected wall and a groove portion arranged on the temporary floor slab, the raised portion matches the groove portion, a tarpaulin is arranged between the contact surface of the temporary floor slab and the ground-connected wall, a waterstop is arranged between the vertical contact surfaces of the raised portion and the groove portion, a concrete cushion layer is arranged at the bottom of the temporary floor slab, and a waterproof board is arranged between the contact surface between the concrete cushion layer and the inner side of the ground-connected wall and the bottom of the temporary floor slab.

[0006] In particular, the cross-section of the raised part is trapezoidal, and the raised part includes ground-connected wall embedded bars, a cast-in-place raised structure, and a first reinforcing steel bar. A number of ground-connected wall embedded bars are implanted in the ground-connected wall, and the exposed ends are placed in the cast-in-place raised structure, and the ends are longitudinally bent into a vertical shape. A number of first reinforcing steel bars are vertically tied and fixed on the ground-connected wall embedded bars.

[0007] In particular, the cross-section of the groove part is trapezoidal, and the groove part includes bent longitudinal stress-bearing steel bars and second reinforcing steel bars. The bent longitudinal stress-bearing steel bars are arranged at the protruding parts of the upper and lower ends of the groove part and are tied and fixed with the main steel bars of the temporary bottom plate. Several second reinforcing steel bars are vertically tied and fixed on the bent longitudinal stress-bearing steel bars.

[0008] In particular, the waterstop includes a rubber part, a galvanized steel edge part, and an adhesive part. The galvanized steel edge parts are arranged on both sides of the rubber part and are bonded and fixed by the adhesive part. A plurality of openings are provided on the galvanized steel edge part. When the raised part is butt-jointed with the groove part, the first reinforcing steel bar and the second reinforcing steel bar pass through the corresponding openings.

[0009] The beneficial effects of the utility model are as follows: the utility model improves the stress state of the end of the temporary bottom plate, so that the temporary bottom plate has good waterproof performance and anti-floating ability; the temporary bottom plate transfers the buoyancy to the ground-connected wall by embedding the interlocking raised parts and groove parts, and at the same time the raised parts and groove parts can allow a certain amount of rotation angle to avoid tensile cracks in the temporary bottom plate at the nodes; compared with the traditional anti-floating measures of the temporary bottom plate of the foundation pit of the subway station, the technical solution provided by the utility model has clear force, high safety, simple construction, short construction period, low construction cost, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the connection between the raised part and the groove part of the utility model;

[0011] Figure 2 It is a schematic diagram of the structure of the raised part of the utility model;

[0012] Figure 3 This is a schematic diagram of the structure of the groove portion of the utility model;

[0013] Figure 4 It is a top view of the water stop of the utility model;

[0014] Figure 5 This is a front view of the water stop of the utility model;

[0015] In the figure: 1-ground-connected wall; 11-raised part; 111-ground-connected wall embedded reinforcement; 112-cast-in-place raised structure; 113-first reinforcing steel bar; 2-temporary bottom plate; 21-groove part; 211-bent longitudinal force-bearing steel bar; 212-second reinforcing steel bar; 3-tarpaulin; 4-waterstop; 41-rubber part; 42-galvanized steel edge; 421-opening; 43-bonding part; 5-concrete cushion; 6-waterproof board;

[0016] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with embodiments:

[0018] like Figure 1-5 As shown, an anti-floating hinge point of a temporary floor slab for a foundation pit of a subway station in a high water level environment includes a raised portion 11 arranged on a ground-connected wall 1 and a groove portion 21 arranged on a temporary floor slab 2, the raised portion 11 matches the groove portion 21, a felt 3 is arranged between the contact surfaces of the temporary floor slab 2 and the ground-connected wall 1, a water stop 4 is arranged between the vertical contact surfaces of the raised portion 11 and the groove portion 21, a concrete cushion 5 is arranged at the bottom of the temporary floor slab 2, and a waterproof board 6 is arranged between the concrete cushion 5 and the contact surfaces of the inner side of the ground-connected wall 1 and the bottom of the temporary floor slab 2. The temporary floor slab 2 transfers the buoyancy it receives to the ground-connected wall 1 through the embedded and engaged raised portion 11 and groove portion 21, and at the same time, the raised portion 11 and groove portion 21 can allow a certain amount of rotation angle to avoid tensile cracks in the temporary floor slab 1 at the nodes.

[0019] The cross-section of the raised portion 11 is trapezoidal. The raised portion 11 includes ground-connected wall anchor bars 111, a cast-in-place raised structure 112, and a first reinforcing steel bar 113. Several ground-connected wall anchor bars 111 are embedded in the ground-connected wall 1, and the exposed ends are placed in the cast-in-place raised structure 112, and the ends are longitudinally bent into a vertical shape. Several first reinforcing steel bars 113 are vertically tied and fixed on the ground-connected wall anchor bars 111; the implantation length and angle of the ground-connected wall anchor bars 111 must meet the anti-floating requirements of the temporary bottom plate 2. Under the action of buoyancy, the raised portion 11 plays a supporting role similar to a corbel on the temporary bottom plate 2, and the ground-connected wall anchor bars 111 and the first reinforcing steel bars 113 should meet the force requirements of the raised portion 11.

[0020] The cross-section of the groove part 21 is trapezoidal, and the groove part 21 includes a bent longitudinal stress-bearing steel bar 211 and a second reinforcing steel bar 212. The bent longitudinal stress-bearing steel bar 211 is arranged at the upper and lower overhanging parts of the groove part 21 and is tied and fixed with the main steel bars of the temporary bottom plate 2, and a number of second reinforcing steel bars 212 are vertically tied and fixed on the bent longitudinal stress-bearing steel bar 211; under the action of buoyancy, the lower end overhanging part of the groove part 21 plays a supporting role similar to a corbel for the protruding part 11, and the bent longitudinal stress-bearing steel bar 211 and the second reinforcing steel bar 212 inside it should meet the force requirements of the overhanging part.

[0021] The waterstop 4 includes a rubber portion 41, a galvanized steel edge portion 42, and an adhesive portion 43. The galvanized steel edge portions 42 are arranged on both sides of the rubber portion 41 and are bonded and fixed by the adhesive portion 43. A plurality of openings 421 are provided on the galvanized steel edge portion 42. When the raised portion 11 is connected to the groove portion 21, the first reinforcing steel bar 113 and the second reinforcing steel bar 212 pass through the corresponding openings 421.

[0022] A method for anti-floating hinge points of temporary bottom slabs of subway station foundation pits under high water level environment comprises the following steps:

[0023] Step 1: Construction of ground-connected wall 1 and excavation of foundation pit;

[0024] The construction of the ground-connected wall 1 includes the construction of the guide wall, excavation of the foundation trench, lowering of the steel cage and pouring of concrete. After the concrete reaches the age strength, the water is lowered, the foundation pit is excavated in layers and internal supports are set until the bottom elevation of the concrete cushion layer 5 of the temporary bottom plate 2 is excavated;

[0025] Step 2: Laying the waterproof board 6 and the concrete pad 5;

[0026] Excavate a trapezoidal groove near the ground connection wall 1 at the bottom of the foundation pit, level and clean the surface of the ground connection wall 1 in the groove, and apply a concrete interface agent;

[0027] One side of the waterproof board 6 is firmly attached to the ground wall 1 in the groove, and the lower flange end of the waterproof board 6 and the surface of the ground wall 1 are coated with cement-based penetrating crystalline waterproof material;

[0028] Backfill the trapezoidal trench with plain concrete and lay the concrete cushion layer 5 of the temporary bottom plate 2;

[0029] Lay the waterproof board 6 on the concrete cushion layer 5 in reverse order to complete the laying of the waterproof board 6 and the concrete cushion layer 5;

[0030] Step 3: roughening and reinforcing bars of ground-connected wall 1;

[0031] The ground-connected wall 1 adjacent to the temporary bottom plate 2 within the thickness range of the temporary bottom plate 2 is roughened. The roughened area is Figure 2 In the arc area in the middle, the concrete in the tension zone on the inner side of the ground-connected wall 1 is chiseled out to expose the longitudinal reinforcement in the tension zone;

[0032] Plant reinforcement within the roughened range of the ground-connected wall 1, i.e., ground-connected wall reinforcement 111. After planting reinforcement, clean the surface of the concrete and longitudinal reinforcement within the roughened range, and apply structural interface glue;

[0033] Furthermore, as a substitute for the ground-connected wall embedded steel bars 111, before the steel cage of the ground-connected wall 1 is lowered, the stress-bearing steel bars (ground-connected wall embedded steel bars 111) of the raised portion 11 of the ground-connected wall 1 can be bent and embedded in advance within the elevation range of the temporary bottom plate 2. After the ground-connected wall 1 is roughened, the embedded stress-bearing steel bars are exposed and corrected, and the surface debris is removed;

[0034] Step 4: Setting the water stop 4 and pouring the raised portion 11;

[0035] Bend the ground-connected wall reinforcement 111, install the water stop 4, tie the first reinforcing steel bar 113, make the first reinforcing steel bar 113 pass through the opening 421 on the galvanized steel edge 42, support the formwork and use micro-expansion concrete for pouring and curing;

[0036] Step 5: Casting of temporary base plate 2;

[0037] Remove the template of the raised part 11 of the ground-connected wall 1 to expose the pre-buried water stop 4, use the raised part 11 as the template of the end of the temporary bottom plate 2, and lay the linoleum 3 at the contact part with the temporary bottom plate 2;

[0038] Tie up the main reinforcement of the temporary base plate 2, and then tie up the bent longitudinal force-bearing reinforcement 211 and the second reinforcement reinforcement 212 at the end, and let the second reinforcement reinforcement 212 pass through the opening 421 on the galvanized steel edge 42 on the other side of the water stop 4, install and cast the temporary base plate 2 formwork and carry out maintenance, remove the formwork and complete the construction.

[0039] The anti-floating hinge point of the temporary bottom plate 2 can form two waterproof layers through the waterproof board 6 and the water stop strip 4, and overcome the buoyancy of the temporary bottom plate 2 through the raised part 11 of the ground-connected wall 1 and the groove part 21 at the end of the temporary bottom plate 2.

[0040] The utility model improves the stress state of the end of the temporary bottom plate 2, so that the temporary bottom plate 2 has good waterproof performance and anti-floating ability; the temporary bottom plate 2 transfers the buoyancy to the ground-connected wall 1 through the embedded and biting raised part 11 and the groove part 21, and at the same time the raised part 11 and the groove part 21 can allow a certain amount of rotation angle to avoid tensile cracks in the temporary bottom plate 2 at the node; compared with the traditional anti-floating measures of the temporary bottom plate 2 of the foundation pit of the subway station, the technical solution provided by the utility model has clear force, high safety, simple construction, short construction period, low construction cost, and has good application prospects.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The above is an exemplary description of the utility model. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or they are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A temporary anti-floating hinge point for the base slab of a subway station in a high water level environment, characterized in that: The invention comprises a raised portion (11) arranged on a ground-connected wall (1) and a recessed portion (21) arranged on a temporary bottom plate (2), wherein the raised portion (11) matches the recessed portion (21), a felt (3) is arranged between the contact surfaces of the temporary bottom plate (2) and the ground-connected wall (1), a water stop strip (4) is arranged between the vertical contact surfaces of the raised portion (11) and the recessed portion (21), a concrete cushion layer (5) is arranged at the bottom of the temporary bottom plate (2), and a waterproof board (6) is arranged between the contact surfaces of the concrete cushion layer (5) and the inner side of the ground-connected wall (1) and the bottom of the temporary bottom plate (2).

2. The anti-floating hinge point of temporary floor slab of a subway station foundation pit under high water level environment according to claim 1, characterized in that: The raised portion (11) has a trapezoidal cross section. The raised portion (11) comprises ground-connected wall embedded bars (111), a cast-in-place raised structure (112), and a first reinforcing steel bar (113). A plurality of ground-connected wall embedded bars (111) are embedded in the ground-connected wall (1), with the exposed ends placed in the cast-in-place raised structure (112), and the ends are longitudinally bent into a vertical shape. A plurality of first reinforcing steel bars (113) are vertically tied and fixed to the ground-connected wall embedded bars (111).

3. The anti-floating hinge point of temporary floor slab of a subway station foundation pit under high water level environment according to claim 2, characterized in that: The groove portion (21) has a trapezoidal cross section and comprises bent longitudinal stress-bearing steel bars (211) and second reinforcing steel bars (212). The bent longitudinal stress-bearing steel bars (211) are arranged at the protruding parts of the upper and lower ends of the groove portion (21) and are tied and fixed to the main steel bars of the temporary bottom plate (2). A plurality of second reinforcing steel bars (212) are vertically tied and fixed to the bent longitudinal stress-bearing steel bars (211).

4. The anti-floating hinge point of temporary floor slab of a subway station foundation pit under high water level environment according to claim 3, characterized in that: The water stop strip (4) comprises a rubber portion (41), a galvanized steel edge portion (42), and an adhesive portion (43). The galvanized steel edge portion (42) is arranged on both sides of the rubber portion (41) and is bonded and fixed by the adhesive portion (43). A plurality of openings (421) are provided on the galvanized steel edge portion (42). When the raised portion (11) is butt-jointed with the groove portion (21), the first reinforcing steel bar (113) and the second reinforcing steel bar (212) pass through the corresponding openings (421).

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