Vertical and horizontal segmented precast box culvert joint water stop structure and its construction method

Abstract

The present invention discloses a vertical and horizontal segmented precast culvert joint water stop structure and its construction method, belonging to the technical field of precast culvert joint construction. The joint water stop structure includes four culvert segments that are spliced vertically and horizontally. The vertical and horizontal joints between the culvert segments are connected by an inserted card slot, and a ring-shaped sealed water stop strip is compacted in the card slot. At the four-corner joints between the culvert segments, a sealed filling part that is hermetically connected to the water stop strips at the cut corners, vertical joints, and horizontal joints is jointly formed by the cut corners of each culvert segment. The present invention not only ensures the overall joint sealing effect but also, when individual joints are damaged, does not affect the sealing performance of other joints, and they do not interfere with each other, thus effectively improving the water stop effect of the precast culvert joints.

Description

Technical Field

[0001] The invention belongs to the technical field of precast culvert joint construction, and particularly relates to a water-stop structure for the joint of precast box culverts divided into upper and lower blocks and a construction method thereof. Background Art

[0002] Precast assembled concrete box culverts are currently being widely promoted and applied. However, there are certain difficulties in the precast, hoisting and transportation processes of large-section precast concrete box culverts. Therefore, a construction process of segmental precast must be adopted. It is found in existing engineering applications that although 2-3 layers of waterproof structures are provided for segmental precast box culverts, the joints are basically connected. When water seeps into a certain joint, water permeation occurs in other parts, resulting in the failure of the waterproof function of the box culvert. At the same time, at present, the water-stop strip at the transverse joint of the segmental precast box culvert is set in the longitudinal direction, and the water-stop strip will be damaged due to transverse dragging during the on-site assembly process, resulting in the failure of the waterproof function at the joint part.

[0003] Based on this, the inventor of the present invention has carefully studied the construction process of precast box culverts and the existing construction quality problems for many years, and developed a water-stop structure for the joint of precast box culverts divided into upper and lower blocks and a construction method thereof, aiming to ensure the waterproof ability of precast box culverts and improve their waterproof effect. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a water-stop structure for the joint of precast box culverts divided into upper and lower blocks and a construction method thereof, so that each vertical joint and horizontal joint between the box culverts are independently sealed through a sealing and filling part, which not only ensures the overall joint sealing effect, but also does not affect the sealing performance of other joints when an individual joint is damaged, and they do not affect each other, thereby effectively improving the water-stop effect of the joints of precast box culverts.

[0005] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a water-stop structure for the joint of precast box culverts divided into upper and lower blocks, including four box culvert sections spliced vertically and horizontally. The vertical joints and horizontal joints between the box culvert sections are connected by plug-in card slots, and a ring-shaped sealing water-stop strip is compacted in the card slots. At the four-corner joints between the box culvert sections, a sealing and filling part is jointly formed by the cut corners of each box culvert section, and the sealing and filling part is hermetically connected to the cut corners, the sealing water-stop strips of the vertical joints and the horizontal joints.

[0007] Further, the sealing and filling part includes:

[0008] A slot hole formed by sequentially connecting the cut corners and the end faces of the ring-shaped sealing water-stop strip at intervals;

[0009] External steel bars are located in the slot holes, embedded in the cut corners and extending towards the center of the slot holes;

[0010] Circular steel bars are tied and connected in a circular shape to the external steel bars;

[0011] Concrete mortar is poured and filled in the slot holes and is hermetically connected between the cut corners and the circular sealing water stop strip.

[0012] Furthermore, a grouting hole communicating with the slot hole and a slurry outlet hole located above the grouting hole are provided on the cut corner of the box culvert slab.

[0013] Furthermore, both the vertical joint and the horizontal joint include a concave socket and a convex plug-in table respectively located on adjacent box culvert slabs and matching with the socket.

[0014] Furthermore, a circular sealing water stop strip is compacted and arranged along the joint direction between the socket and the plug-in table. On both sides of the circular sealing water stop strip and between the socket and the plug-in table, hinge joints filled and arranged along the joint direction are respectively provided. The hinge joints are hermetically connected with the concrete mortar of the sealing filling part.

[0015] Furthermore, at least three layers of the internal steel bars and circular steel bars are concentrically arranged from the inside to the outside in the sealing filling part.

[0016] In a second aspect, the present invention provides a construction method for the precast box culvert joint water stop structure as described in the first aspect, including the following method steps:

[0017] Lift and install the four lower and upper spliced box culvert slabs in sequence, and set a circular sealing water stop strip between the concave socket and the convex plug-in table of the plug-in card slot connection structure between the vertical joint and the horizontal joint;

[0018] Adopt the prestressed tensioning method to compact the circular sealing water stop strip between the sockets and plug-in tables of adjacent box culvert slabs to achieve tight connection;

[0019] In the slot holes surrounded by the cut corners of the box culvert slabs and the circular sealing water stop strip at intervals in sequence, fix and tie the circular steel bars in a circular shape to the external steel bars extending out of the cut corners, with at least three layers arranged concentrically, and block the two sides of the inner and outer orifices of the slot holes with templates;

[0020] Pour concrete mortar into the slot holes through the grouting holes opened on the cut corners until the slot holes are fully filled and the slurry outlet holes located above the grouting holes overflow;

[0021] After the concrete is completely solidified, fill the joints between the sockets and plug-in tables on both sides of the circular sealing water stop strip with two-component polysulfide sealant to form hinge joints.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0023] For the precast box culvert joint water stop structure with upper and lower blocks of the present invention, a ring-shaped sealing water stop strip is compacted in the card slots between adjacent upper, lower, left, and right box culvert slabs, and a sealed filling part formed by pouring and sealing is surrounded by the cut corners of the box culvert slabs at the intersection of the vertical joints and the horizontal joints. Each vertical joint and horizontal joint between the box culverts, such as every joint, is independently sealed through the sealed filling part, which not only ensures the overall joint sealing effect but also, when individual joints are damaged, will not affect the sealing performance of other joints, without mutual influence, thereby effectively improving the water stop effect of the precast box culvert joints. At the same time, the water stop strip is segmented and sealed, which can reduce its damage during on-site assembly and effectively ensure its waterproof function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional schematic diagram of a precast box culvert joint water stop structure with upper and lower blocks provided according to an embodiment of the present invention;

[0025] Figure 2 is a structural schematic diagram of a sealed filling part provided according to an embodiment of the present invention;

[0026] Figure 3 is a front view of a precast box culvert joint water stop structure with upper and lower blocks provided according to an embodiment of the present invention;

[0027] Figure 4 is an arrangement schematic diagram of a ring-shaped sealing water stop strip provided according to an embodiment of the present invention;

[0028] Figure 5 is a cross-sectional view of a joint between adjacent box culvert slabs provided according to an embodiment of the present invention;

[0029] Figure 6 is a lapping schematic diagram of a ring-shaped sealing water stop strip provided according to an embodiment of the present invention.

[0030] In the figures:

[0031] 1. Box culvert slab; 2. Ring-shaped sealing water stop strip; 3. Slot hole; 4. External steel bar; 5. Ring-shaped steel bar; 6. Grouting hole; 7. Grout outlet hole; 8. Socket; 9. Insertion platform; 10. Hinge joint; 11. Cut corner. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0035] As Figure 1 and Figure 3 shown, in the embodiment of the present invention, a water-stop structure for the joint of the precast box culvert with upper and lower blocks is provided, which includes four box culvert segments 1 spliced vertically, horizontally, left and right. The vertical joints and horizontal joints between adjacent box culvert segments 1 are connected by plug-in card slots, and a ring-shaped sealing water-stop strip 2 is compacted in the card slots. Among them, the ring-shaped sealing water-stop strip 2 can adopt a water-swelling water-stop strip, etc.

[0036] Referring to Figure 2 , cutouts 11 are provided on four adjacent spliced box culvert segments 1, and at the four-corner joints between the four box culvert segments 1, that is, at the intersection of the vertical joint and the horizontal joint, a sealing and filling part is jointly formed by the cutouts 11 of each box culvert segment 1, which is hermetically connected to the cutouts 11, the vertical joint, and the sealing water-stop strip of the horizontal joint, and is used to divide and seal the vertical joint and the horizontal joint between the box culvert segments 1, which not only ensures the overall joint sealing effect, but also when individual joints are damaged, it will not affect the sealing performance of other joints, and they do not affect each other.

[0037] In this embodiment, the sealing and filling part includes a slot hole 3, external steel bars 4, ring-shaped steel bars 5, and concrete mortar. The specific details of the above parts are as follows:

[0038] The slot hole 3 is formed by sequentially connecting the cutouts 11 and the ring-shaped sealing water-stop strip 2 at intervals. In this embodiment, the slot hole 3 has a hollow rectangular structure.

[0039] External steel bars 4 are located in the slot hole 3, embedded in the cut corner 11 and extending towards the center of the slot hole 3; the annular steel bars 5 are annularly tied and connected to the external steel bars 4. In this embodiment, at least three layers of internal steel bars and annular steel bars 5 are sequentially arranged in the sealing filling part from inside the box culvert to outside the box culvert, and each layer of internal steel bars and annular steel bars 5 are tied into a radially radiating steel bar mesh structure from the annular steel bars 5 towards the surroundings.

[0040] Concrete mortar is poured and filled in the slot hole 3 and is hermetically connected between the cut corner 11 and the annular sealing water stop strip 2, and is used for dividing and sealing the vertical joints and horizontal joints between the box culvert sheets 1.

[0041] A grouting hole 6 communicating with the slot hole 3 and a slurry outlet hole 7 located below the grouting hole 6 are opened on the cut corner 11 of the box culvert sheet 1, and are used for injecting and filling concrete mortar into the slot hole 3 blocked by the template.

[0042] In this embodiment, both the vertical joint and the horizontal joint include a concave socket 8 and a convex plug-in table 9 respectively located on adjacent box culvert sheets 1 and matching with the socket 8. The whole joint is in a "concave" shape. An annular sealing water stop strip 2 is arranged at the bottom of the "concave" joint, and filling hinge joints 10 are arranged in the two side joints of the "concave" shape for sealing and waterproofing.

[0043] An annular sealing water stop strip 2 is compacted and arranged along the joint direction between the socket 8 and the plug-in table 9. On both sides of the annular sealing water stop strip 2 and between the socket 8 and the plug-in table 9, hinge joints 10 are respectively arranged along the joint direction for filling, and the hinge joints 10 are hermetically connected with the concrete mortar of the sealing filling part.

[0044] Specifically, the annular sealing water stop strip 2 can adopt an integrally formed annular structure, or be formed into an annular structure by crimping the two ends of a strip-shaped water stop strip. Refer to Figure 6 , at the joint of the two ends of the strip-shaped water stop strip, one end is cut into two petals, and the other end is inserted and inserted to realize the completely closed connection of the water stop strip.

[0045] The embodiment of the present invention also provides a precast box culvert bridge, which includes several precast box culvert sheets and adopts the above-mentioned up-and-down segmented precast box culvert joint water stop structure.

[0046] In addition, the embodiment of the present invention also provides a construction method for a precast box culvert joint water stop structure, including the following method steps:

[0047] Sequentially hoist the four lower and upper spliced box culvert sheets 1, and paste and set an annular sealing water stop strip 2 between the concave socket 8 and the convex plug-in table 9 of the plug-in card slot connection structure between the vertical joint and the horizontal joint;

[0048] Adopt the prestressed tensioning method to compact the annular sealing water stop strip 2 between the socket 8 and the insertion platform 9 of the adjacent culvert slabs 1 of the culvert to achieve a tight connection. Among them, the annular sealing water stop strip 2 is arranged along the joint direction and is close to the two ends of the cut corner 11;

[0049] In the slot 3 formed by the spaced connection of the cut corner 11 of the culvert slab 1 and the annular sealing water stop strip 2 in sequence, the annular steel bar 5 is fixedly tied to the external steel bar 4 extending out of the cut corner 11 in a ring shape. In this embodiment, at least three layers of steel bar meshes formed by tying the external steel bar 4 and the annular steel bar 5 are provided, and the openings on both inner and outer sides of the slot 3 are blocked with templates;

[0050] Pour the concrete mortar into the slot 3 through the grouting hole 6 opened on the cut corner 11 until the slot 3 is filled and the slurry outlet hole 7 above the grouting hole 6 overflows;

[0051] After the concrete is completely solidified, fill the joint between the socket 8 and the insertion platform 9 on both sides of the annular sealing water stop strip 2 with two-component polysulfide sealant to form a hinge joint 10.

[0052] In the precast culvert bridge, repeat the above operations until the joint water stop structure between all adjacent culvert slabs 1 is completed.

[0053] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A water stop structure for the joint of a precast box culvert with upper and lower blocks, characterized in that It includes four box culvert slabs spliced vertically, horizontally, longitudinally and transversely. The vertical and horizontal joints between the box culvert slabs are connected by plug-in card slots, and a ring-shaped sealing water stop strip is compacted in the card slots. At the four-corner joints between the box culvert slabs, a sealing filling part is jointly formed by the cut corners of each box culvert slab, which is hermetically connected to the cut corners, the sealing water stop strips of the vertical joints and the horizontal joints; The sealing filling part includes: Slot holes, which are surrounded by the cut corners and the end faces of the ring-shaped sealing water stop strip at intervals; External steel bars, located in the slot holes, embedded in the cut corners and extending towards the center of the slot holes; Ring-shaped steel bars, which are connected in a ring shape to the external steel bars; Concrete mortar, which is poured and filled in the slot holes and is hermetically connected between the cut corners and the ring-shaped sealing water stop strip; A grouting hole communicating with the slot hole and a slurry outlet hole located above the grouting hole are provided on the cut corners of the box culvert slab; Both the vertical joint and the horizontal joint include a concave socket and a convex plug-in platform respectively located on adjacent box culvert slabs and matching the socket; A ring-shaped sealing water stop strip is compacted between the socket and the plug-in platform along the joint direction. On both sides of the ring-shaped sealing water stop strip and between the socket and the plug-in platform, hinge joints filled along the joint direction are respectively provided, and the hinge joints are hermetically connected to the concrete mortar of the sealing filling part.

2. The split precast box culvert joint water stop structure according to claim 1, characterized in that, At least three layers of the external steel bars and the ring-shaped steel bars are concentrically arranged from the inside to the outside in the sealing filling part.

3. A construction method for the water stop structure at the joint of the upper and lower precast box culverts as described in any one of claims 1 to 2, characterized in that, It includes the following method steps: Lift and install the four spliced box culvert slabs at the lower and upper parts in sequence, and set a ring-shaped sealing water stop strip between the concave socket and the convex plug-in platform of the plug-in card slot connection structure between the vertical joint and the horizontal joint; Adopt the prestressed tensioning method to compact the ring-shaped sealing water stop strip between the socket and the plug-in platform of adjacent box culvert slabs to achieve a tight connection; In the slot holes surrounded by the cut corners of the box culvert slab and the ring-shaped sealing water stop strip at intervals, fix and tie the ring-shaped steel bars in a ring shape to the external steel bars extending out of the cut corners, with at least three layers arranged concentrically, and block the two sides of the slot holes at the orifice inside and outside the slot holes with templates; Pour concrete mortar into the slot holes through the grouting holes opened on the cut corners until the slot holes are filled and the slurry outlet holes located above the grouting holes overflow with slurry; After the concrete is completely solidified, fill a two-component polysulfide sealant in the joints between the socket and the plug-in platform on both sides of the ring-shaped sealing water stop strip to form hinge joints.

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