Water-stopping structure at the connection between the bottom plate and the well wall in the caisson

Abstract

The utility model relates to a water-stop structure at the connection between the bottom plate and the well wall in a caisson, characterized in that it comprises a second section caisson and a water-stop strip, wherein the second section caisson is adjacent to the bottom section caisson and is located above the bottom section caisson, the water-stop strip is annular, and comprises an outer ring portion and an inner ring portion having the same center of a circle, the outer ring portion of the water-stop strip is located inside the well wall of the second section caisson, and the inner ring portion of the water-stop strip is located in the space surrounded by the inner well wall of the second section caisson. Compared with the prior art, the utility model has the advantages that the water-stop strip is directly arranged at the construction joint between the bottom plate concrete layer and the second section caisson, and has a good waterproof effect; moreover, the water-stop strip is partially embedded in the second section caisson, and the pouring construction of the second section caisson is simple; in addition, the water-stop strip is arranged horizontally, and the width extending out of the well wall is small, so that the bottom plate concrete layer can be poured and compacted during the concrete pouring construction.

Description

Technical Field

[0001] The utility model relates to the technical field of caisson construction, in particular to a water-stop structure at the connection between a bottom plate and a well wall in a caisson. Background Art

[0002] During the design and construction process of caisson structure, bottom sealing is the last step. When sealing the bottom, the connection between the caisson wall and the bottom plate belongs to the secondary pouring. Due to the existence of construction joints, waterproofing measures are particularly important.

[0003] Chinese invention patent CN103726502B, with authorization number, discloses a bottom section caisson with a waterproof structure. Specifically, the inner wall of the bottom section caisson is provided with a plurality of protrusions at the position of casting the bottom plate, and the protrusions are all extended to the inner side of the bottom section caisson along the radial plane of the bottom section caisson; a water stop is pre-buried on the protrusion, one end of the water stop extends into the protrusion and is fixedly connected to the built-in steel plate in the protrusion, and the other end of the water stop extends to the outside of the protrusion. When the caisson wall and the bottom plate are cast for the second time, the protrusion in the present invention is cast as one body with the bottom plate, and the water stop on the protrusion is also cast in the bottom plate. This waterproof structure can enhance the integrity of the bottom section caisson and the bottom plate, and at the same time improve the waterproof effect of the bottom section caisson and the bottom plate.

[0004] However, in the above-mentioned invention patent, the convex structure on the bottom section caisson and the waterstop structure arranged on the convex portion increase the difficulty of pouring the bottom section caisson and make it difficult to perform dense pouring during the bottom plate pouring process. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a water-stopping structure at the connection between the bottom plate concrete layer and the well wall in a caisson, which is simple in structure and easy to cast and construct, in view of the current status of the prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a water-stop structure at the connection between the bottom plate and the well wall in the caisson, characterized in that: it includes a second section caisson and a water-stop strip, the second section caisson is adjacent to the bottom section caisson and is located above the bottom section caisson, the water-stop strip is annular, the water-stop strip includes an outer ring portion and an inner ring portion with the same center, the outer ring portion of the water-stop strip is located inside the well wall of the second section caisson, and the inner ring portion of the water-stop strip is located in the space surrounded by the inner well wall of the second section caisson. In other words, the outer diameter of the water-stop strip is larger than the inner diameter of the well wall, the inner diameter of the water-stop strip is smaller than the inner diameter of the well wall, and the inner ring portion protrudes from the inner well wall and extends into the caisson.

[0007] In order to improve the waterproof performance of the waterstop, the waterstop is a waterstop steel plate, and the outer ring portion and the inner ring portion of the waterstop are an integrated piece.

[0008] In order to accurately determine the positional relationship between the waterstop and the second section of the caisson and facilitate the embedding of the waterstop into the second section of the caisson, the outer ring portion has a plurality of connection holes arranged at intervals along the circumference of the outer ring portion, and a plurality of vertically extending steel bars are provided in the wall of the second section of the caisson, and each of the steel bars passes through a corresponding connection hole on the outer ring portion.

[0009] Preferably, each of the connection holes is welded to the corresponding steel bar, and the heights of the welding points of each of the connection holes and the corresponding steel bars are the same. The same height of the welding points makes the water stop belt in a horizontal position without tilting, thus ensuring the waterproof effect of the water stop belt; the steel bar is round steel, and the welding of the connection holes on the water stop belt and the round steel adopts the welding form of the water stop ring, and the bottom and the top should be welded full; and the weld here cannot be stressed during transportation and hoisting.

[0010] Preferably, the ring width of the waterstop is 440-520 mm, preferably 450 mm.

[0011] Preferably, the ratio of the width of the outer ring to the width of the inner ring is in the range of 1:3 to 1:1; the center of each of the connecting holes is located on the central annular line of the outer ring. For example, only the inner ring of the water stop is arranged outside the well wall, the ring width outside the well wall is 280 mm, and the ring width inside the well wall is 170 mm, which has a relatively small impact on the pouring of the concrete layer of the bottom slab; the central annular line divides the outer ring into two parts with equal ring widths.

[0012] Preferably, a bottom slab concrete layer is provided inside the second section caisson, and an underwater concrete layer is provided inside the bottom section caisson; the inner ring portion of the waterstop is located inside the bottom slab concrete layer.

[0013] Preferably, the bottom slab concrete layer is located at the lower side of the second section caisson, and the thickness of the bottom slab concrete layer is 280 to 320 mm, preferably 300 mm.

[0014] In order to prevent the vertical waterstop steel plate between the bottom section caisson and the second section caisson and the waterstop strip on the second section caisson from interfering with each other during concrete pouring, the vertical spacing between the vertical waterstop steel plate and the waterstop strip is greater than or equal to 80 mm, and the design height of the second section caisson needs to be increased by 200 mm, and the height of the bottom section caisson is reduced by 200 mm.

[0015] In order to improve the waterproof effect of the waterstop, the waterstop is in a circular ring shape, and the inner and outer ring edges of the waterstop are provided with inclined portions inclined downward toward the plane direction of the lower end of the second section of the caisson. The waterstop can be flexibly arranged according to the structure of the caisson, and can be in a circular ring shape or a square ring shape; when the waterstop is in a square ring shape, the waterstop only needs to be overlapped end to end with conventional waterstop steel plates.

[0016] In order to facilitate the welding construction between the waterstop belt and the steel bars, the waterstop belt includes a plurality of waterstop monomers, each of which is a fan-ring structure, and each of the waterstop monomers is overlapped end to end.

[0017] In order to improve the waterproof effect of the water-stop steel plate, the water-stop steel plate is a dezincified steel plate. The dezincified water-stop steel plate can improve the waterproof effect after rusting.

[0018] Preferably, the bottom surface of the waterstop steel plate is shot blasted and the waterstop steel plate is made of Q235 steel.

[0019] Compared with the prior art, the advantages of the utility model are: the waterstop is directly arranged at the construction joint between the bottom plate concrete layer and the second section caisson, and the waterproof effect is good; and the waterstop is partially embedded in the second section caisson, and the pouring construction of the second section caisson is simple; in addition, the waterstop is arranged horizontally, and the ring width of the inner ring part extending out of the well wall is small, so the bottom plate concrete layer can be poured densely during the concrete pouring construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the water stop in the embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure after the bottom plate concrete layer is poured in the embodiment of the utility model;

[0022] Figure 3 It is a schematic structural diagram of the water stop monomer in the embodiment of the utility model. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 3 The figure shows a preferred embodiment of the water-stop structure at the connection between the bottom plate and the well wall in the caisson of the utility model, the water-stop structure includes a second-section caisson 1 located above the bottom-section caisson 4, a water-stop strip 2 and a bottom plate concrete layer 3, the water-stop strip 2 is arranged horizontally, the thickness of the water-stop strip 2 is 6 mm, and it is used to waterproof the construction joint between the second-section caisson 1 and the bottom plate concrete layer 3.

[0025] like Figure 2 As shown, a second section caisson 1 is arranged above the bottom section caisson 4, an underwater concrete layer 5 is poured inside the bottom section caisson 4, and a bottom plate concrete layer 3 is poured inside the second section caisson 1; and a vertical water-stop steel plate 6 is arranged between the bottom section caisson 4 and the second section caisson 1, the vertical water-stop steel plate 6 having a thickness of 3 mm and a width of 250 mm, which is manually bent on site according to the actual pattern of the elastic ink line, and then lifted to the designed position and finally welded. The function of the vertical water-stop steel plate 6 is to prevent a large amount of underground pressure water from pouring into the construction joint position during the excavation stage of the caisson construction, thereby improving the construction environment and safety.

[0026] The horizontal cross section of the second section caisson 1 is annular. A plurality of vertically extending steel bars 11 are arranged in the wall of the second section caisson 1, and the steel bars 11 are round steel bars.

[0027] In this embodiment, the waterstop 2 is in the shape of a circular ring, and the ring width of the entire waterstop 2 is 450 mm; the circular ring-shaped waterstop 2 includes an outer ring portion 21 and an inner ring portion 22 which are concentric and integrally arranged, the ring width of the outer ring portion 21 is 170 mm, and the ring width of the inner ring portion 22 is 280 mm; the outer ring portion 21 of the waterstop 2 is located in the well wall of the second section caisson 1, and the inner ring portion 22 of the waterstop 2 is located in the bottom slab concrete layer 3. During actual construction, the outer ring portion 21 of the waterstop 2 is first cast in the well wall of the second section caisson 1, and the inner ring portion 22 of the waterstop 2 is located in the space surrounded by the inner well wall, and then the bottom slab concrete layer 3 is cast inside the well wall. Since the ring width of the inner ring portion 22 of the waterstop 2 is 280 mm, the inner ring portion 22 has little effect on the pouring of the bottom slab concrete layer 3. In addition, in order to improve the waterproof effect of the waterstop strip 2, the waterstop strip 2 also has the following designs: first, the inner ring edge and the outer ring edge of the waterstop strip 2 are both provided with an inclined portion 23 inclined downward toward the plane direction of the lower end of the second section caisson 1; second, the waterstop strip 2 is a waterstop steel plate, and the waterstop steel plate is a degalvanized steel plate after the galvanized layer is removed from the galvanized steel plate. The degalvanized steel plate can improve the waterproof effect after rusting. After the degalvanized steel plate is rusted, the gap between the waterstop steel plate and the concrete will be reduced to achieve a waterstop effect. In addition, after a few years, the rust will generate gelling compounds to block the gaps, thereby better meeting the waterstop requirements.

[0028] Specifically, a plurality of connection holes 211 are arranged on the outer ring portion 21 of the water stop 2 at intervals along the circumference of the outer ring portion 21, and each steel bar 11 arranged in the well wall passes through each corresponding connection hole 211. During the specific construction, the outer ring portion 21 of the water stop 2 is drilled according to the position of the steel bar 11 arranged on site to obtain the above-mentioned connection holes 211, the center of the connection hole 211 is located on the central annular line 212 of the outer ring portion 21 of the outer ring portion 21, the diameter of the connection hole 211 is slightly larger than the diameter of the steel bar 11, and the connection hole 211 and the steel bar 11 are welded on site; in order to make the water stop 2 arranged horizontally, the welding position heights between each connection hole 211 and each corresponding steel bar 11 are consistent. The height of the above-mentioned welding point is not greater than the height of the top surface of the bottom slab concrete layer 3 and not less than the height of the bottom surface of the bottom slab concrete layer 3. In addition, the height of the waterstop belt 2 cannot be set too low to prevent the water belt 2 from interfering with the setting of the vertical waterstop steel plate 6 between the bottom section caisson 4 and the second section caisson 1; in order to better cooperate with the setting of the vertical waterstop steel plate 6, the design height of the second section caisson 1 is increased by 200 mm on the original basis; the height of the bottom section caisson is reduced by 200 mm on the original basis.

[0029] In order to facilitate drilling holes on the waterstop 2 and welding between the waterstop 2 and the steel bar 11, the waterstop 2 in this embodiment includes four waterstop monomers overlapped end to end, each of which is a fan ring structure, and the central angle corresponding to the fan ring structure is 90 degrees. The connection between the overlapping parts of each waterstop monomer is: bottom surface overhead welding, top surface horizontal electric welding.

[0030] The construction process of the water-stop structure in the utility model is as follows:

[0031] Step 1, prepare a waterstop 2 suitable for the caisson to be constructed, wherein the waterstop 2 includes four waterstop monomers of a fan ring structure, each fan ring structure corresponds to a central angle of 90 degrees, and the four waterstop monomers are overlapped end to end to form the waterstop 2, the outer diameter of the waterstop 2 is larger than the inner diameter of the wall of the caisson to be constructed, and the inner diameter of the waterstop 2 is smaller than the inner diameter of the wall of the caisson to be constructed;

[0032] Step 2: Before pouring the bottom section caisson 4, set the vertical water-stop steel plate 6, and then pour the bottom section caisson 4; tie the steel bars 11 of the second section caisson, and drill corresponding connection holes 211 on the water-stop monomer according to the position of the steel bars 11, wherein it is necessary to ensure that the steel bars 11 are located at the outer ring portion 21 of the water-stop belt 2, and the inner ring portion 22 of the water-stop belt 2 can protrude from the inner well wall after the second section caisson is poured;

[0033] Step 3, pass the steel bar 11 through the connection hole 211, and fix each water-stopping unit to the steel bar 11 by welding the connection hole 211 and the steel bar 11. In this step, the horizontal arrangement of each water-stopping unit needs to be maintained, and the height of the water-stopping unit from the lower end surface of the second section caisson 1 is controlled to be half the thickness of the bottom slab concrete layer 3 to be poured;

[0034] Step 4: Perform overhead welding on the bottom surface of the overlapping parts of adjacent water-stopping monomers and perform horizontal arc welding on the top surface;

[0035] Step 5: Concrete the second section caisson 1 structure, the outer ring portion 21 of the water stop 2 is located inside the well wall of the second section caisson 1, and the inner ring portion 22 of the water stop 2 protrudes from the inner well wall of the second section caisson 1;

[0036] Step 6, pouring underwater concrete layer 5;

[0037] Step 7, set the surface reinforcement and bottom reinforcement of the bottom slab concrete layer 3 above the underwater concrete layer 5, and embed the main reinforcement. The reinforcement of the underwater concrete layer 5 is tied and welded. When the welding point encounters water marks, use a blowtorch to heat it to evaporate the water, and then weld it on one side. The reinforcement of the bottom slab concrete layer 3 is 14@100; then pour the bottom slab concrete layer 3. The accumulated water on the top surface of the underwater concrete layer 5 should be dried with a rag, and then pour while drying, and then pour the whole. The thickness of the bottom slab concrete layer 3 is 300mm, of which the bottom protective layer is 80mm thick and the surface layer is 50mm;

[0038] The inner ring portion 22 of the waterstop strip 2 is cast in the bottom slab concrete layer 3. This waterstop structure can not only enhance the integrity of the second section caisson 1 and the bottom slab concrete layer 3, but also improve the waterproof effect of the second section caisson 1 and the bottom slab concrete layer 3.

[0039] The waterstop 2 is directly arranged at the construction joint between the bottom plate concrete layer 3 and the second section caisson 1, and has a good waterproof effect; and the waterstop 2 is partially embedded in the second section caisson 1, and the pouring construction of the second section caisson 1 is simple; in addition, the waterstop 2 is horizontally arranged and the inner ring portion 22 protrudes out of the well wall with a small ring width, so the bottom plate concrete layer can be poured densely during the concrete pouring construction.

[0040] The bottom slab concrete layer of this scheme is non-underwater concrete, which has sufficient strength and impermeability and is evenly mixed. After the bottom slab concrete layer and the underwater concrete layer are poured successively, the construction joints are self-healed, meeting the characteristics of micro cracks, having a water-stopping effect, reducing the pressure of groundwater on the bottom slab, so there will be no leakage, and the bearing capacity of the underwater concrete layer also meets the design requirements.

Claims

1. The water-stopping structure at the connection between the bottom plate and the well wall in the caisson is characterized by: The invention comprises a second section caisson (1) and a water stop (2), wherein the second section caisson (1) is adjacent to and located above a bottom section caisson (4), the water stop (2) is annular, and comprises an outer ring portion (21) and an inner ring portion (22) having the same center, the outer ring portion (21) of the water stop (2) being located inside the well wall of the second section caisson (1), and the inner ring portion (22) of the water stop (2) being located in the space enclosed by the inner well wall of the second section caisson (1).

2. The water stop structure according to claim 1, characterized in that: The water stop strip (2) is a water stop steel plate, and the outer ring portion (21) and the inner ring portion (22) of the water stop strip (2) are an integral part.

3. The water stop structure according to claim 2, characterized in that: The outer ring portion (21) has a plurality of connection holes (211) arranged at intervals along the circumference of the outer ring portion (21); a plurality of vertically extending steel bars (11) are provided in the wall of the second section caisson (1); each of the steel bars (11) passes through a corresponding connection hole (211) on the outer ring portion (21).

4. The water stop structure according to claim 3, characterized in that: Each of the connection holes (211) is welded to the corresponding steel bar (11), and the heights of the welding points of each of the connection holes (211) and the corresponding steel bar (11) are the same.

5. The water stop structure according to claim 4, characterized in that: The ring width of the water stop strip (2) is 440 to 520 millimeters.

6. The water stop structure according to claim 5, characterized in that: The ratio of the width of the outer ring portion (21) to the width of the inner ring portion (22) is in the range of 1:3 to 1:1; the center of each connecting hole (211) is located on the central annular line (212) of the outer ring portion (21).

7. The water stop structure according to any one of claims 1 to 6, characterized in that: A bottom slab concrete layer (3) is provided inside the second section caisson (1), and an underwater concrete layer (5) is provided inside the bottom section caisson (4); the inner ring portion (22) of the water stop strip (2) is located inside the bottom slab concrete layer (3).

8. The water stop structure according to claim 7, characterized in that: The bottom slab concrete layer (3) is located at the lower side of the second section caisson (1), and the thickness of the bottom slab concrete layer (3) is 280 to 320 millimeters.

9. The water stop structure according to claim 8, characterized in that: The water stop belt (2) is in the shape of a circular ring, and both the inner ring edge and the outer ring edge of the water stop belt (2) are provided with an inclined portion (23) inclined downward toward the plane direction where the lower end of the second section caisson (1) is located.

10. The water stop structure according to claim 9, characterized in that: The waterstop strip (2) comprises a plurality of waterstop monomers, each of which is a fan-ring structure, and each of the waterstop monomers is overlapped end to end.

Images