Construction node and construction method for reducing vibration transmission in foundation pit

Abstract

The application relates to the technical field of foundation pit construction, and discloses a construction node and a construction method for reducing vibration transmission in a foundation pit, which comprises a lattice column, a first pit, a dewatering well, a second pit, a first connecting section formed by pouring concrete on the part of the column section of the lattice column above the first pit, a second connecting section formed by the well section of the dewatering well above the second pit, a raft foundation connected with the first connecting section and the second connecting section, a waterproof layer and a vibration isolation layer covering the surfaces of the first connecting section and the second connecting section, and a convex layer formed by the raft foundation at the first pit and the second pit. The construction node and the construction method for reducing vibration transmission in the foundation pit provided by the application make the lattice column and the dewatering well have non-rigid contact with the raft foundation through the vibration isolation layer, so that the vibration transmission is weakened, the first pit and the second pit are arranged at the positions where the lattice column and the dewatering well pass through the raft foundation, the space of the pits is used as a space for displacement, the raft foundation is provided with a locally thickened plate layer, and the structural strength is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit construction, in particular to a construction node and method for reducing vibration transmission in a foundation pit. BACKGROUND

[0002] A foundation pit refers to a subsurface space formed by excavation on the ground, and a foundation pit engineering is a supporting structure and underground water control engineering required to ensure the safety and stability of a construction building.

[0003] In the current foundation pit engineering, a deep foundation pit often adopts a supporting form of a column pile and a lattice column, and a dewatering well is arranged to perform water level dewatering. The lattice column and the dewatering well are arranged through the raft foundation and rigidly connected with the raft foundation at the through connection position. In a deep foundation pit adjacent to a subway, the vibration generated by the operation of the subway is transmitted to the raft foundation through the dewatering well, the lattice column and the column pile at the bottom of the lattice column, and then transmitted to the building, thereby affecting the building and reducing the comfort of the building. In addition, the strength of the raft foundation at the lattice column and the dewatering well is weaker than the structural strength of the raft foundation at other positions, thereby affecting the overall strength of the foundation pit. SUMMARY

[0004] Therefore, the present application provides a construction node and method for reducing vibration transmission in a foundation pit to solve the problems that, in a foundation pit adjacent to a subway, the vibration generated by the operation of the subway is transmitted to the raft foundation through the lattice column and the dewatering well, and then transmitted to the building, thereby affecting the building, and the strength of the connection position of the raft foundation with the lattice column and the dewatering well is weaker than the structural strength of the raft foundation at other positions.

[0005] In a first aspect, the present application provides a construction node for reducing vibration transmission in a foundation pit, applied to the foundation pit, comprising: a lattice column arranged in the foundation pit, and part of the column body is buried in the bottom of the foundation pit; the bottom of the foundation pit is recessed and formed with a first pit on the lateral side of the lattice column; a dewatering well is arranged in the foundation pit, and part of the well body is buried in the bottom of the foundation pit, and the bottom of the foundation pit is recessed and formed with a second pit on the lateral side of the dewatering well; wherein the part of the column segment of the lattice column above the first pit is formed into a first connecting segment by pouring concrete, and the well segment of the dewatering well above the second pit is defined as a second connecting segment; a cushion layer is laid on the bottom of the foundation pit; a raft foundation is arranged above the cushion layer and connected with the first connecting segment and the second connecting segment respectively; the surface of the first connecting segment, the second connecting segment and the cushion layer is covered with a waterproof layer; a vibration isolation layer is tightly covered on the outer side of the waterproof layer and is adapted to reduce the vibration transmitted from the raft foundation to the lattice column and the dewatering well; wherein the raft foundation forms a convex layer at the first pit and the second pit after pouring, and the convex layer is adapted to increase the strength of the raft foundation at the lattice column and the dewatering well respectively.

[0006] Beneficial effects: by setting the vibration isolation layer, the lattice column and the drying well are in non-rigid contact with the raft foundation, thereby weakening the vibration transmission, and the first pit and the second pit are set at the positions where the lattice column and the drying well pass through the raft foundation, the space of the pit is used as a displacement feature, the raft foundation obtains a locally thickened plate layer, thereby improving the structural strength, and in addition, multiple waterproof measures are provided to ensure that the waterproof performance of the raft foundation is not affected.

[0007] The construction joint provided by the application effectively reduces the vibration transmission effect of the raft foundation to the lattice column and the drying well, the vibration isolation layer is tightly covered on the outer side of the waterproof layer and wraps the peripheral part at the connection part of the lattice column and the drying well and the raft foundation, thereby achieving non-rigid contact between the lattice column, the drying well and the raft foundation, thereby effectively weakening the vibration generated by the subway operation and directly transmitted to the building through the lattice column and the drying well, the vibration isolation layer is arranged at the passing-through part of the lattice column and the drying well and the raft foundation, thereby significantly reducing the influence of vibration on the building, thereby improving the living comfort of the building, and the waterproof effect of the raft foundation is not affected, and the vibration isolation structure is simple, the required materials are common and can be directly obtained on the construction site, and is economical and reliable.

[0008] The construction joint provided by the application effectively enhances the structural strength of the raft foundation at the lattice column and the drying well, the first pit and the second pit are arranged around the lattice column and the drying well, respectively, after pouring concrete into the raft foundation, a convex layer is formed at the pit due to the local space depression, the convex layer raft block plays a role of local reinforcement, thereby enhancing the structural strength of the raft foundation at the connection part of the lattice column and the drying well, making the overall structure more stable, and ensuring the structural safety and service life.

[0009] The construction joint provided by the application effectively improves the waterproof effect of the raft foundation at the passing-through part of the lattice column and the drying well, the setting of the convex plate improves the water blocking effect at the passing-through area, and the waterproof layer is closed at the top of the lattice column and the drying well, thereby obtaining a comprehensive waterproof effect, in addition, multiple waterproof procedures are provided, the waterproof coating and the waterproof roll are matched, thereby ensuring the waterproof effect, improving the waterproof redundancy, and ensuring the building use function.

[0010] In an alternative embodiment, a protective layer is further included, which is covered on the bottom of the foundation pit and covers the outer side of the vibration isolation layer.

[0011] In an alternative embodiment, the raft foundation comprises a strip, a reserved raft and a pouring layer; the strip is arranged on the periphery of the lattice column and is provided with a break at the lattice column, the first connecting section is arranged through the break; the pouring layer is arranged above the protection layer, and the convex layer is formed at the first recess and the second recess; the reserved raft is connected to the side of the first connecting section away from the cushion layer; wherein the waterproof layer and the vibration isolation layer extend to the connection position of the first connecting section and the reserved raft, so as to completely separate the vibration isolation layer from the connection between the lattice column and the raft foundation.

[0012] In an alternative embodiment, the thickness of the vibration isolation layer is D, wherein: D=25mm.

[0013] In an alternative embodiment, the strip comprises a first strip and a second strip, the first strip is arranged in the horizontal direction, the second strip is arranged in the first recess, and the second strip is arranged along the inner wall of the first recess and is bent; the first strip and the second strip are respectively provided with the break.

[0014] In an alternative embodiment, the cushion layer extends into the first recess and the second recess, and covers the inner wall of the first recess and the second recess.

[0015] In an alternative embodiment, further comprising a buffer layer arranged in the first recess and sandwiched between the protection layer and the vibration isolation layer.

[0016] In an alternative embodiment, the shape of the bottom of the first recess and the second recess is square; a plurality of lattice columns are arranged in the foundation pit; a plurality of dewatering wells are arranged in the foundation pit.

[0017] In an alternative embodiment, further comprising a truss arranged in the foundation pit, and the truss is connected with a plurality of lattice columns.

[0018] In a second aspect, the present application provides a construction method for reducing vibration transmission in a foundation pit, which is suitable for the construction joint for reducing vibration transmission in a foundation pit as described in any one of the preceding aspects, comprising: excavating the foundation pit; disposing a latticed column in the foundation pit, part of the column body of the latticed column being embedded in the bottom of the foundation pit; disposing a dewatering well in the foundation pit, part of the well body of the dewatering well being embedded in the bottom of the foundation pit; excavating a first pit at the bottom of the foundation pit and around the circumferential side of the latticed column to obtain a first recess; excavating a second pit at the bottom of the foundation pit and around the circumferential side of the dewatering well to obtain a second recess; laying a cushion layer at the bottom of the foundation pit; pouring concrete at the part of the latticed column above the first recess to obtain a first connecting section; brushing waterproof paint on the surface of the first recess and the first connecting section; sequentially covering the surface of the first connecting section, the second connecting section and the cushion layer with a waterproof layer and a vibration isolation layer; covering the surface of the vibration isolation layer with a protective layer; disposing a reinforcing bar above the protective layer, and disposing a reserved raft slab on the side of the first connecting section away from the cushion layer; pouring concrete above the protective layer to obtain a pouring layer, the pouring layer forming a convex layer at the first recess and the second recess. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is a top view schematic diagram of the foundation pit of the present application;

[0021] Figure 2 It is a schematic diagram of the construction joint for weakening vibration transmission at the latticed column of the present application;

[0022] Figure 3 It is a schematic diagram of the construction joint for weakening vibration transmission at the dewatering well of the present application; Figure 2 It is an enlarged schematic diagram of A in the present application;

[0023] Figure 4 It is a schematic diagram of the construction joint for weakening vibration transmission at the dewatering well of the present application;

[0024] Figure 5 It is an enlarged schematic diagram of B in the present application; Figure 4

[0025] Figure 6 It is a structural schematic diagram of the latticed column after the raft foundation is poured of the present application.

[0026] Explanation of reference signs:

[0027] ​1, foundation pit; 11, first pit; 12, second pit; 13, cushion layer; 14, truss; 2, lattice column; 21, first connecting section; 3, dewatering well; 31, second connecting section; 4, raft foundation; 41, rib; 411, first rib; 412, second rib; 42, reserved raft; 43, pouring layer; 44, convex layer; 5, waterproof layer; 6, vibration isolation layer; 7, protective layer; 8, buffer layer. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0032] The embodiments of the present application will be described below with reference to the drawings. Figures 1 to 6

[0033] ​According to an embodiment of the present application, in one aspect, a construction node for reducing vibration transmission in a foundation pit 1 is provided, which is applied to the foundation pit 1 and includes: a lattice column 2 arranged in the foundation pit 1 and partially embedded in the bottom of the foundation pit 1; the bottom of the foundation pit 1 is recessed to form a first pit 11 around the side of the lattice column 2; a dewatering well 3 is arranged in the foundation pit 1 and partially embedded in the bottom of the foundation pit 1, and the bottom of the foundation pit 1 is recessed to form a second pit 12 around the side of the dewatering well 3; wherein the part of the column segment of the lattice column 2 above the first pit 11 is formed into a first connecting segment 21 by pouring concrete, and the well segment of the dewatering well 3 above the second pit 12 is defined as a second connecting segment 31; a cushion layer 13 is laid on the bottom of the foundation pit 1; a raft foundation 4 is arranged above the cushion layer 13 and connected with the first connecting segment 21 and the second connecting segment 31 respectively; the surface of the first connecting segment 21, the second connecting segment 31 and the cushion layer 13 is covered with a waterproof layer 5; a vibration isolation layer 6 is tightly covered on the outside of the waterproof layer 5 and is suitable for reducing the vibration transmitted from the raft foundation 4 to the lattice column 2 and the dewatering well 3; wherein the raft foundation 4 forms a convex layer 44 at the first pit 11 and the second pit 12 after pouring, and the convex layer 44 is suitable for increasing the strength of the raft foundation 4 at the lattice column 2 and the dewatering well 3 respectively.

[0034] In the present embodiment, the lattice column 2 and the dewatering well 3 are in non-rigid contact with the raft foundation 4 by arranging the vibration isolation layer 6, so as to weaken the vibration transmission, and the first pit 11 and the second pit 12 are arranged at the positions where the lattice column 2 and the dewatering well 3 penetrate the raft foundation 4, and the space of the pits is used as a displacement feature, so that the raft foundation 4 obtains a locally thickened plate layer, thereby improving the structural strength, and in addition, multiple waterproof measures are arranged to ensure that the waterproof performance of the raft foundation 4 is not affected.

[0035] Further, the vibration isolation layer 6 is an elastic cushion layer 13, which can be a polyurethane damping pad and has a long-term isolation effect, and the polyurethane damping pad wraps the first connecting segment 21 at the lattice column 2, so that the lattice column 2 is in non-rigid contact with the pouring layer 43 at the raft foundation 4, thereby weakening the vibration transmission, and the same applies to the dewatering well 3.

[0036] Further, the first pit 11 and the second pit 12 are arranged around the lattice column 2 and the dewatering well 3 respectively, and play a role of local reinforcement after pouring concrete in the raft foundation 4, and the raft foundation 4 forms a convex layer 44 at the pits, and the convex layer 44 plate can also play a water-blocking effect.

[0037] The specific construction process is that: a foundation pit 1 is excavated, a lattice column 2 is arranged in the foundation pit 1, the lower end column body of the lattice column 2 is buried in the pit bottom of the foundation pit 1, and the lower end column body is wrapped and arranged by pouring concrete, and the upper end column body of the lattice column 2 is exposed; a dewatering well 3 is arranged in the foundation pit 1, the lower end well body of the dewatering well 3 is buried in the pit bottom soil layer of the foundation pit 1, and the top end well body is exposed; the pit bottom of the foundation pit 1 is excavated to obtain a first pit 11 and a second pit 12, the first pit 11 and the second pit 12 are arranged around the lattice column 2 and the dewatering well 3 respectively; the first pit 11 and the second pit 12 are used to make the raft foundation 4 obtain a local thickening layer to compensate for the area structure strength of the raft foundation 4 affected by being connected with the lattice column 2 and the dewatering well 3; the cushion layer 13 concrete is poured at the pit bottom of the foundation pit 1, and the cushion layer 13 concrete also covers the first pit 11 and the second pit 12 arranged in the pit bottom of the foundation pit 1; the lattice column 2 is polished and cleaned, the penetration crystallization waterproof construction is carried out at the pit bottom of the first pit 11, the concrete is poured and wrapped at the part column segment of the lattice column 2 above the first pit 11 to obtain a first connecting section 21; the waterproof coating is brushed on the surface concrete layer of the first pit 11 and the first connecting section 21, and the waterproof coating can be non-solidified asphalt waterproof coating; the waterproof layer 5 and the vibration isolation layer 6 are sequentially arranged on the surfaces of the first connecting section 21, the second connecting section 31 and the cushion layer 13, the waterproof layer 5 can be SBS waterproof coiled material, that is, elastomer modified asphalt waterproof coiled material; the waterproof layer 5 is laid on the surface of the cushion layer 13 and wrapped around the periphery of the first connecting section 21 and the second connecting section 31, and the vibration isolation layer 6 is arranged on the outer side of the waterproof layer 5 and wrapped around the periphery of the first connecting section 21 and the second connecting section 31, so as to realize the isolation of the lattice column 2 and the dewatering well 3 from the raft reinforced concrete, that is, the lattice column 2 and the dewatering well 3 are in non-rigid contact with the raft foundation 4 through the vibration isolation layer 6, and the vibration isolation layer 6 weakens the vibration generated during the subway operation and directly transmitted to the building through the lattice column 2 and the dewatering well 3, so as to achieve the vibration reduction effect and reduce the influence on the building, thereby improving the living comfort of the building; the protective layer 7 is laid on the surface of the vibration isolation layer 6, and the protective layer 7 has a waterproof effect; the reinforcing bars 41 are arranged above the protective layer 7, and the reserved raft 42 is arranged on the side of the first connecting section 21 away from the cushion layer 13; the filling concrete is poured above the protective layer 7 to obtain a pouring layer 43, the pouring layer 43 forms a convex layer 44 at the first pit 11 and the second pit 12 to play a role of local reinforcement, and the setting of the thickened convex layer 44 plate also has a water blocking effect; after the raft foundation is poured, the column segment of the lattice column 2 above the first connecting section 21 is cut off to seal the waterproof layer 5 and the vibration isolation layer 6 above the first connecting section 21, so as to realize the overall waterproof and vibration isolation effect.In addition, after the main structure is completed in the foundation pit 1, waterproof concrete is poured in the drainage well 3, and the top of the well pipe of the drainage well 3 is sealed by welding a steel plate, and then the waterproof layer 5 and the vibration isolation layer 6 are closed at the top of the well pipe, so as to achieve the effect of overall waterproofing and vibration isolation.

[0038] The construction joint provided by the embodiment effectively reduces the vibration transmission effect of the raft foundation 4 to the lattice column 2 and the drainage well 3. By arranging the vibration isolation layer 6, the layer is tightly covered on the outer side of the waterproof layer 5 and wraps the peripheral part arranged at the connection part of the lattice column 2 and the drainage well 3 with the raft foundation 4, so as to realize the non-rigid contact between the lattice column 2, the drainage well 3 and the raft foundation 4, thereby effectively weakening the vibration generated by the subway operation and directly transmitted to the building through the lattice column 2 and the drainage well 3. The vibration isolation layer 6 is arranged at the penetration part of the lattice column 2 and the drainage well 3 with the raft foundation 4, which significantly reduces the influence of vibration on the building, thereby improving the living comfort of the building. At the same time, the waterproof effect of the raft foundation 4 is not affected, and the vibration isolation structure is simple, the required materials are common, can be directly obtained on the construction site, and is economical and reliable.

[0039] The construction joint provided by the embodiment effectively enhances the structural strength of the raft foundation 4 at the lattice column 2 and the drainage well 3. By arranging the first recess 11 and the second recess 12, and arranging the first recess 11 and the second recess 12 around the lattice column 2 and the drainage well 3 respectively, after pouring concrete in the raft foundation 4, a convex layer 44 is formed at the recess due to the local space recess, and the convex layer 44 plays a role of local reinforcement of the raft slab, thereby enhancing the structural strength of the raft foundation 4 at the connection part of the lattice column 2 and the drainage well 3, making the overall structure more stable, and ensuring the structural safety and service life.

[0040] The construction joint provided by the embodiment effectively improves the waterproof effect of the raft foundation at the penetration part of the lattice column 2 and the drainage well 3. The arrangement of the convex layer 44 slab improves the water resistance effect of the penetration area, and the waterproof layer 5 is closed at the top of the lattice column 2 and the drainage well 3, so as to obtain the overall waterproof effect. In addition, a plurality of waterproof procedures are arranged, and waterproof paint and waterproof coiled material are matched to ensure the waterproof effect, improve the waterproof redundancy, and ensure the building use function.

[0041] In some embodiments, in combination with Figure 2 As shown in the figure, the construction joint for reducing vibration transmission in the foundation pit 1 further includes a protective layer 7 covering the bottom of the foundation pit 1 and covering the outer side of the vibration isolation layer 6. The protective layer 7 can be fine stone concrete, and the laying thickness can be 50mm, which is used to protect and prolong the service life of the vibration isolation layer 6 and the waterproof layer 5.

[0042] In some embodiments, in combination with Figures 2 to 6As shown, the raft foundation 4 includes the rib 41, the reserved raft 42 and the pouring layer 43; the rib 41 is arranged on the side of the lattice column 2 and is provided with a break at the lattice column 2, the first connecting section 21 is arranged through the break, the rib 41 is a steel bar, and a plurality of steel bars are arranged in sequence above the protection layer 7; the pouring layer 43 is filled above the protection layer 7 and forms the convex layer 44 at the first recess 11 and the second recess 12, wherein the pouring layer 43 is formed by using concrete poured above the protection layer 7; the reserved raft 42 is connected to the side of the first connecting section 21 away from the cushion layer 13; wherein the waterproof layer 5 and the vibration isolation layer 6 extend to the connection position of the first connecting section 21 and the reserved raft 42, after cutting off the column section of the lattice column 2 above the reserved raft, the vibration isolation layer 6 and the waterproof layer 5 are closed to completely isolate the connection between the lattice column 2 and the raft foundation 4, and the overall vibration isolation effect is ensured.

[0043] In some embodiments, in combination Figures 2 to 4 As shown, the thickness of the vibration isolation layer 6 is D, wherein D = 25 mm, so as to ensure that the vibration is effectively isolated and the overall thickness and weight of the structure are not excessively increased; the vibration isolation layer 6 can be a polyurethane damping pad, which can be cut into a required shape and size by workers according to the structure to be installed and the position during installation, so as to adapt to different installation requirements.

[0044] In some embodiments, in combination Figure 2 As shown, the rib 41 includes the first rib 411 and the second rib 412, the first rib 411 is arranged in a horizontal direction, and a plurality of second ribs 412 are arranged in parallel, which are suitable for being arranged on the horizontal surface of the protection layer 7, the second rib 412 is arranged in the first recess 11, and the second rib 412 is arranged in a bent manner along the inner wall surface of the first recess 11 and is suitable for being arranged on the inner wall surface of the first recess 11; the first rib 411 and the second rib 412 are respectively provided with the break, and the lattice column 2 is arranged through the break.

[0045] In the embodiment, the first rib 411 and the second rib 412 are respectively arranged on the horizontal bottom of the foundation pit 1 and in the first recess 11, which are suitable for being arranged above the protection layer 7 in a full manner, which is suitable for improving the tensile capacity of the concrete layer after pouring the concrete layer, thereby enhancing the carrying capacity and safety of the structure, the arrangement form of the steel bar is matched with the state of the bottom of the foundation pit 1, the construction design is reasonable, and the practicability is high.

[0046] In some embodiments, in combination Figures 2 to 4As shown, the cushion layer 13 extends into the first pit 11 and the second pit 12, and covers the inner wall surface of the first pit 11 and the second pit 12. The cushion layer 13 is formed by pouring concrete, and has a thickness of 150 mm, so as to realize the leveling of the foundation pit 1 and balance the stress of the foundation.

[0047] In some embodiments, in combination with Figure 2 As shown, the construction node for reducing vibration transmission in the foundation pit 1 further includes a buffer layer 8 arranged in the first pit 11 and sandwiched between the protective layer 7 and the vibration isolation layer 6. The buffer layer 8 can be an extruded board, which is a hard foam plastic board formed by heating and extruding. The buffer layer 8 has a thickness of 100 mm and can be cut to a size suitable for the shape and size of the first pit 11.

[0048] In some embodiments, in combination with Figures 1 to 6 As shown, the bottom of the first pit 11 and the second pit 12 is square-shaped, and the longitudinal section is trapezoidal-shaped. A plurality of lattice columns 2 are arranged in the foundation pit 1 at intervals, and the plurality of lattice columns 2 are connected by a truss 14. The truss 14 is arranged inside the foundation pit 1, and the truss 14 is connected to the plurality of lattice columns 2. The truss 14 has a plurality of connected rod bodies. A plurality of drainage wells 3 are arranged in the foundation pit 1 at intervals, so as to drain underground water or rainwater, so as to avoid the accumulation of water and the high water level.

[0049] In another aspect, the present application provides a construction method for reducing vibration transmission in a foundation pit 1, which is suitable for the construction joint for reducing vibration transmission in the foundation pit 1 according to any one of the above aspects. The construction method for reducing vibration transmission in the foundation pit 1 comprises: excavating the foundation pit 1; arranging a latticed column 2 in the foundation pit 1, part of the column body of the latticed column 2 being embedded in the bottom of the foundation pit 1; arranging a dewatering well 3 in the foundation pit 1, part of the well body of the dewatering well 3 being embedded in the bottom of the foundation pit 1; digging a pit at the bottom of the foundation pit 1 and around the position of the circumferential side of the latticed column 2 to obtain a first pit 11; digging a pit at the bottom of the foundation pit 1 and around the position of the circumferential side of the dewatering well 3 to obtain a second pit 12; laying a cushion 13 at the bottom of the foundation pit 1; pouring concrete at the part of the latticed column 2 above the first pit 11 to obtain a first connecting section 21; brushing waterproof paint on the surface of the first pit 11 and the first connecting section 21; sequentially arranging a waterproof layer 5 and a vibration isolation layer 6 on the surface of the first connecting section 21, a second connecting section 31 and the cushion 13; arranging a protective layer 7 on the surface of the vibration isolation layer 6; arranging a reinforcing bar 41 above the protective layer 7, and arranging a reserved raft 42 on the side of the first connecting section 21 away from the cushion 13; pouring concrete above the protective layer 7 to obtain a pouring layer 43, the pouring layer 43 forming a convex layer 44 at the first pit 11 and the second pit 12.

[0050] The construction method for reducing vibration transmission in the foundation pit 1 provided by the embodiment mainly aims at the foundation pit 1 adjacent to a subway in the related art. The vibration generated when the subway is running will be transmitted to the building through the latticed column 2 and the dewatering well 3, which will affect the building. In addition, the strength of the connection part between the raft foundation 4 and the latticed column 2 and the dewatering well 3 is weaker than the structural strength of other positions of the raft foundation. The vibration isolation layer 6 is arranged to make the latticed column 2 and the dewatering well 3 have non-rigid contact with the raft foundation 4, so as to weaken the vibration transmission. In addition, the first pit 11 and the second pit 12 are arranged at the positions where the latticed column 2 and the dewatering well 3 penetrate the raft foundation 4. The space of the pits is used to make room for the arrangement, so that the raft foundation 4 obtains a locally thickened plate layer, thereby improving the structural strength. In addition, multiple waterproof measures are arranged to ensure that the waterproof performance of the raft foundation 4 is not affected.

[0051] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope of the present application.

Claims

1. A construction node for reducing vibration transmission in a foundation pit, characterized in that: Application to foundation pit (1); The construction nodes for reducing vibration transmission in the foundation pit include: The lattice column (2) is arranged in the foundation pit (1), and a portion of the column body is buried in the bottom of the foundation pit (1); the bottom of the foundation pit (1) is recessed to form a first recess (11) on the circumference of the lattice column (2); A drainage well (3) is provided in the foundation pit (1), and a portion of the well body is buried in the bottom of the foundation pit (1); the bottom of the foundation pit (1) is recessed to form a second recess (12) on the circumference of the drainage well (3); The portion of the lattice column (2) located above the first pit (11) is cast with concrete to form a first connecting section (21), and the section of the drainage well (3) located above the second pit (12) is defined as a second connecting section (31); A cushion layer (13) is laid on the bottom of the foundation pit (1); A raft foundation (4) is provided above the cushion layer (13) and is connected to the first connecting section (21) and the second connecting section (31) respectively; The surfaces of the first connecting section (21), the second connecting section (31) and the cushion layer (13) are covered with a waterproof layer (5); A vibration isolation layer (6) closely covering the outer side of the waterproof layer (5) and adapted to reduce the vibration transmitted from the raft foundation (4) to the lattice column (2) and the drainage well (3); wherein, after the raft foundation (4) is poured, convex layers (44) are formed at the first pit (11) and the second pit (12), and the convex layers (44) are suitable for increasing the strength of the raft foundation (4) at the lattice column (2) and the drainage well (3); A protective layer (7) covers the bottom of the foundation pit (1) and is arranged on the outside of the vibration isolation layer (6); The raft foundation (4) includes reinforcement bars (41), a reserved raft slab (42) and a casting layer (43); The ribs (41) are arranged on the circumferential side of the lattice column (2), and a fracture is provided at the lattice column (2), and the first connecting section (21) is arranged through the fracture; The casting layer (43) is filled above the protective layer (7), and forms the convex layer (44) at the first concave pit (11) and the second concave pit (12); The reserved raft (42) is connected to a side of the first connecting section (21) away from the cushion layer (13); The waterproof layer (5) and the vibration isolation layer (6) extend to the connection position between the first connection section (21) and the reserved raft (42), and are suitable for the vibration isolation layer (6) to completely isolate the connection between the lattice column (2) and the raft foundation (4).

2. The construction node for reducing vibration transmission in a foundation pit according to claim 1, characterized in that: The thickness of the vibration isolation layer (6) is D, where D=25 mm.

3. The construction node for reducing vibration transmission in a foundation pit according to claim 2, characterized in that: The rib (41) includes a first rib (411) and a second rib (412), wherein the first rib (411) extends in a horizontal direction, and the second rib (412) is disposed in the first recess (11), and the second rib (412) extends and bends along the inner wall surface of the first recess (11); The first rib (411) and the second rib (412) are respectively provided with the fracture.

4. The construction node for reducing vibration transmission in a foundation pit according to claim 3, characterized in that: The cushion layer (13) extends into the first pit (11) and the second pit (12), and covers the inner wall surfaces of the first pit (11) and the second pit (12).

5. The construction node for reducing vibration transmission in a foundation pit according to claim 4, characterized in that: It also includes a buffer layer (8), which is arranged in the first pit (11) and is sandwiched between the protective layer (7) and the vibration isolation layer (6).

6. The construction node for reducing vibration transmission in a foundation pit according to claim 1, characterized in that: The bottoms of the first pit (11) and the second pit (12) are square in shape; A plurality of lattice columns (2) are arranged at intervals in the foundation pit (1), and a plurality of dewatering wells (3) are arranged at intervals in the foundation pit (1).

7. The construction node for reducing vibration transmission in a foundation pit according to claim 6, characterized in that: It also includes a truss (14) disposed in the foundation pit (1), wherein the truss (14) is respectively connected to a plurality of lattice columns (2).

8. A construction method for reducing vibration transmission in a foundation pit, characterized in that: Applicable to the construction node for reducing vibration transmission in a foundation pit as described in any one of claims 1 to 7 above, the construction method for reducing vibration transmission in a foundation pit comprises: Excavation of foundation pit (1); A lattice column (2) is arranged in the foundation pit (1), and a portion of the column body of the lattice column (2) is buried in the bottom of the foundation pit (1); A drainage well (3) is provided in the foundation pit (1), and a portion of the well body of the drainage well (3) is buried at the bottom of the foundation pit (1); Digging a pit at a position around the lattice column (2) at the bottom of the foundation pit (1) to obtain a first recessed pit (11); Digging a pit at a position around the drainage well (3) at the bottom of the foundation pit (1) to obtain a second pit (12); Laying a cushion layer (13) at the bottom of the foundation pit (1); pouring concrete into a portion of the lattice column (2) located above the first recess (11) to obtain a first connecting section (21); Applying waterproof coating on the surface of the first recess (11) and the first connecting section (21); A waterproof layer (5) and a vibration isolation layer (6) are sequentially provided on the surfaces of the first connecting section (21), the second connecting section (31) and the cushion layer (13); A protective layer (7) is provided on the surface of the vibration isolation layer (6); A rib (41) is provided above the protective layer (7), and a reserved raft (42) is provided on a side of the first connecting section (21) away from the cushion layer (13); Concrete is poured on the protective layer (7) to obtain a pouring layer (43), wherein the pouring layer (43) forms a convex layer (44) at the first pit (11) and the second pit (12).

Images