Prefabricated box culvert structure and construction technology thereof

Abstract

The invention discloses a prefabricated box culvert structure and a construction process thereof, and the prefabricated box culvert structure comprises box culvert sections which are arranged in a tubular shape with a rectangular cross section, one end of each box culvert section is provided with a plug, and the other end of each box culvert section is provided with a slot; the tensioning seats are integrally formed and arranged at the four corners of the inner walls of the box culvert sections, long-strip-shaped tensioning grooves are formed in the middles of the outer side walls of the tensioning seats, and threading pipes which are arranged in the length direction of the tensioning seats and communicate with the two ends of the tensioning grooves are horizontally embedded in the two ends of the tensioning seats correspondingly; and the steel strand is arranged between every two adjacent box culvert sections and penetrates through every two adjacent threading pipes, anchorage devices are arranged at the two ends of each steel strand, and the anchorage devices are located in the tensioning grooves and press the inner walls of the ends of the tensioning grooves. The steel strands are arranged at the four corners of the adjacent box culvert sections, connection and fixation of the box culvert sections are achieved, traditional flexible connection is changed into rigid connection, the structural strength and connection stability of the box culvert sections are improved, splicing seams are prevented from being enlarged, and the leakage risk is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, in particular to a prefabricated box culvert structure and a construction process thereof. BACKGROUND

[0002] The box culvert is an underground structure with a closed box-shaped cross section, which is commonly used in traffic, water conservancy, municipal engineering and the like. It is usually made of reinforced concrete and has good integrity and bearing capacity. The prefabricated box culvert refers to a box-shaped culvert structure that is prefabricated at a factory or a prefabrication site near a construction site. After the foundation is treated, it is transported to the site for hoisting and splicing.

[0003] In the traditional prefabricated box culvert, the end of the prefabricated box culvert is usually connected and fixed by using the plug-in structure. However, this connection method is a flexible connection. After a long period of use, the joint gap at the connection position of the prefabricated box culvert segment will become wider, thereby increasing the risk of leakage, which needs to be improved. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application aims to provide a prefabricated box culvert structure with the effect of reducing the risk of leakage.

[0005] The above technical purpose of the present application is achieved by the following technical scheme: a prefabricated box culvert structure comprising: a box culvert segment, which is tubular with a rectangular cross section, one end of the box culvert segment is provided with a plug, and the other end is provided with a plug-in slot for the plug to be inserted into; a tensioning seat, which is trapezoidal in cross section and is integrally formed at the four corner positions of the inner wall of the box culvert segment, a long strip-shaped tensioning slot is provided at the middle position of the outer side wall of the tensioning seat, and two ends of the tensioning seat are both horizontally embedded with a threading pipe arranged along the length direction and communicating with both ends of the tensioning slot; a steel strand, which is arranged between two adjacent box culvert segments and penetrates through two adjacent threading pipes, both ends of the steel strand are provided with an anchor, and the anchor is located in the tensioning slot and presses the end inner wall of the tensioning slot.

[0006] In a preferred example, the tensioning seat is further provided with a grouting hole penetrating through the threading pipe.

[0007] In a preferred example, the cross sections of the plug and the plug-in slot are both wedge-shaped, and the annular inner wall of the plug-in slot is provided with an annular expansion rubber ring pressing the outer wall of the plug.

[0008] In a preferred example, the outer wall of the plug is step-shaped and clamps the expansion rubber ring.

[0009] The application can be further configured in a preferred example that the end inner wall of the slot is embedded with at least two annular elastic rubber rings, and the end of the plug is pressed against the elastic rubber rings.

[0010] The application can be further configured in a preferred example that the inner and outer sides at the splicing joint position of the two adjacent box culvert segments are provided with polysulfide sealing paste.

[0011] The application can be further configured in a preferred example that the inner wall of the box culvert segment is provided with a polyurethane waterproof coating layer.

[0012] The application can be further configured in a preferred example that it further comprises a prefabricated cushion layer, the prefabricated cushion layer comprises a bottom layer and a top layer, the top layer is located above the bottom layer, the width of the bottom layer is greater than that of the top layer, the two sides of the top layer are flush with the two sides of the box culvert segment, and a waterproof roll is arranged between the bottom layer and the top layer, and the waterproof roll wraps the top layer and the box culvert segment.

[0013] Another object of the application is to provide a construction process of a prefabricated box culvert structure, which has the effect of reducing the risk of leakage.

[0014] The above technical objects of the application are achieved by the following technical scheme: a construction process of a prefabricated box culvert structure, comprising the following steps: S1, prefabricated cushion layer installation, first, the bottom layer is horizontally laid and fixed on the ground, then the waterproof roll is laid on the bottom layer, and the two ends of the waterproof roll are extended outward, and then the top layer is laid and fixed on the waterproof roll, and the joints between the top layers are staggered with the joints of the bottom layer; S2, box culvert segment installation, the expanded rubber ring is sleeved on the plug, the elastic rubber ring is embedded in the slot, the first box culvert segment is hoisted to the end position, the center line and the side line of the box culvert segment are aligned with the center line and the side line of the top layer, the first box culvert segment is fixed, the middle position of the box culvert segment is aligned with the joint of the top layer, the next box culvert segment is placed on the top layer, the center line and the side line of the two box culvert segments are adjusted to be aligned, the hydraulic jacking mechanism is used to push the box culvert segments to be inserted and connected, and the splicing joint of the two adjacent box culvert segments is controlled within 10mm-12mm; S3, steel strand construction, the steel strand is inserted from the tension groove position of the first box culvert segment, passes through the threading pipe on the adjacent two box culvert segments, and is taken out from the tension groove position of the second box culvert segment, then one end of the steel strand is fixed in the tension groove of the first box culvert segment by using an anchor, then the hydraulic jack is placed in the tension groove of the second box culvert segment, and the steel strand passes through the hydraulic jack, then the hydraulic jack is started to realize the tension of the steel strand, so that the second box culvert segment is close to the first box culvert segment until the splicing joint is 3mm-5mm, the other end of the steel strand is fixed in the tension groove of the second box culvert segment by using an anchor, and finally the hydraulic jack is removed, and the excess steel strand is cut off, and in this way, the box culvert segments are connected and tensioned, then the cement slurry is injected into the threading pipe along the grouting hole, and the threading pipe is filled, and then the tension groove is filled and smoothed with fine stone concrete; S4, internal waterproof construction, the splicing joint of the box culvert segment is polished once using a grinding wheel or a steel wire brush, and loose and weak parts are removed, then floating dust is cleaned using a brush or a handheld blower, if the splicing joint is wet, the surface can be dried using a hot air gun or a blowtorch, then a 30-50mm wide masking tape is pasted at the position of 10mm on the non-sealing area of the two sides of the splicing joint, then flexible filling material is filled into the splicing joint, so that the depth of the splicing joint is 10mm-15mm, for controlling the glue injection depth, then the polysulfide sealant is embedded into the splicing joint, after the embedding is full, the putty knife is used for scraping and troweling, so that the inside is dense and the surface is smooth. S5, waterproof spraying construction, the polyurethane waterproof coating layer is uniformly sprayed on the inner wall of the box culvert segment in three times, and the interval is 30min each time, and the thickness of each polyurethane waterproof coating layer is 1mm. S6, external waterproof construction, the waterproof roll between the bottom layer and the top layer is wrapped upwards, and all the top layer and the box culvert segment are fully wrapped.

[0015] In summary, the present application has the following advantages: 1. By arranging the steel strand at the position of the four corners of the adjacent box culvert segments, the connection and fixation of the box culvert segments are realized, the traditional flexible connection is changed into rigid connection, the structural strength and connection stability of the box culvert segment are increased, the splicing joint is prevented from being enlarged, and the leakage risk is reduced. 2. By embedding the polysulfide sealant at the position of the splicing joint of the adjacent box culvert segments, and spraying the polyurethane waterproof coating layer on the inner wall of the box culvert segment, the waterproof performance of the box culvert segment is increased, so that the leakage risk is reduced. 3. By arranging the double-layer prefabricated cushion layer, the box culvert segment is slidably installed on the top layer, the box culvert segment is prevented from scratching the waterproof roll, and then the waterproof roll fully wraps the top layer and the box culvert segment, so that the waterproof performance of the box culvert segment is further increased, and the leakage risk is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an embodiment; Figure 2 is a connection relationship schematic diagram of an embodiment; Figure 3 is a structural schematic diagram of a prefabricated cushion layer of an embodiment; Figure 4 is a structural schematic diagram of a box culvert segment of an embodiment; Figure 5 is an internal structural schematic diagram of a box culvert segment of an embodiment; Figure 6 is a connection relationship schematic diagram of a box culvert segment of an embodiment.

[0017] Reference signs: 1, box culvert segment; 11, plug; 12, socket; 13, expanded rubber ring; 14, elastic rubber ring; 15, polysulfide sealant; 16, polyurethane waterproof coating layer; 2, tensioning seat; 21, tensioning groove; 22, threading pipe; 23, grouting hole; 3, steel strand; 31, anchorage device; 4, prefabricated cushion layer; 41, bottom layer; 42, top layer; 43, waterproof roll material. DETAILED DESCRIPTION

[0018] The application will be further described in detail below with reference to the accompanying drawings. EMBODIMENT

[0019] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , a prefabricated box culvert structure comprises a box culvert segment 1, a tensioning seat 2 and a steel strand 3.

[0020] As shown in Figure 6 , the cross section of the box culvert segment 1 is in the form of a rectangular tube, one end of the box culvert segment 1 is provided with a plug 11, and the other end is provided with a socket 12 for inserting the plug 11.

[0021] As shown in Figure 6 , the cross sections of the plug 11 and the socket 12 are both in the form of a wedge, the annular inner wall of the socket 12 is provided with an annular expanded rubber ring 13 for pressing the outer wall of the plug 11, and the outer wall of the plug 11 is in the form of a step and clamps the expanded rubber ring 13.

[0022] As shown in Figure 6 , the end inner wall of the socket 12 is embedded with at least two annular elastic rubber rings 14, and the end of the plug 11 presses the elastic rubber ring 14.

[0023] Therefore, by setting the plug-in box culvert section 1, the quick plug-in fixing between adjacent box culvert sections 1 is realized, and the construction efficiency is increased. At the same time, the expansion rubber ring 13 and the elastic rubber ring 14 are arranged between the adjacent box culvert sections 1, the sealing between the adjacent box culvert sections 1 is increased, the waterproof performance of the box culvert section 1 is improved, and the leakage risk is reduced.

[0024] As shown in Figure 6 , the two adjacent box culvert sections 1 are provided with polysulfide sealing paste 15 at the joint position, the polysulfide sealing paste 15 is embedded on the inner and outer sides of the joint, and after curing, it forms a fixed connection to realize the sealing connection of the joint position, improve the waterproof performance of the box culvert section 1, and reduce the risk of leakage.

[0025] As shown in Figure 6 , the inner wall of the box culvert section 1 is provided with a polyurethane waterproof coating layer 16, which is a fast-curing material with a gel time of 8 seconds. It can provide loose structure repair or structural protection, provide good leakage control, especially pressure plugging, and provide good chemical corrosion resistance, thereby improving the waterproof performance of the box culvert section 1 and reducing the risk of leakage.

[0026] As shown in Figure 4 , Figure 5 , the tensioning seat 2 is in the shape of a trapezoid and is integrally formed at the four corner positions of the inner wall of the box culvert section 1. The outer side wall of the tensioning seat 2 is provided with a long strip-shaped tensioning groove 21 in the shape of a trapezoid, and the two ends of the tensioning seat 2 are both horizontally embedded with a threading pipe 22 arranged along the length direction and connected to both ends of the tensioning groove 21.

[0027] As shown in Figure 4 , Figure 5 , the steel strand 3 is arranged between the two adjacent box culvert sections 1 and penetrates the two adjacent threading pipes 22, and the two ends of the steel strand 3 are both provided with an anchor 31 located in the tensioning groove 21 and pressing the end inner wall of the tensioning groove 21.

[0028] Therefore, by arranging the steel strand 3 at the four corner positions of the adjacent box culvert sections 1, the connection and fixation of the box culvert section 1 are realized, the traditional flexible connection is changed to rigid connection, the structural strength and connection stability of the box culvert section 1 are increased, the joint is prevented from being enlarged, and the risk of leakage is reduced.

[0029] As shown in Figure 4 , Figure 5As shown, the tensioning seat 2 is provided with a grouting hole 23 penetrating the threading pipe 22, which is sealed after grouting. Thus, after the steel strand 3 is tensioned, cement paste can be injected into the threading pipe 22 along the grouting hole 23 to fill the threading pipe 22, so that the steel strand 3 is integrated with the entire box culvert segment 1 and is fixed with each other, the stability of the steel strand 3 is increased, and rigid connection is realized. Then, the tensioning groove 21 is filled and smoothed with cement paste to realize plugging of the tensioning groove 21, and the stability of the box culvert segment 1 and the stability of the later waterproof construction are ensured.

[0030] As shown in Figure 1 , Figure 2 , Figure 3 As shown, the precast cushion layer 4 includes a bottom layer 41 and a top layer 42, the top layer 42 is located above the bottom layer 41, the width of the bottom layer 41 is greater than the width of the top layer 42, and the two sides of the top layer 42 are flush with the two sides of the box culvert segment 1. A waterproof roll 43 is arranged between the bottom layer 41 and the top layer 42, and the waterproof roll 43 wraps the top layer 42 and the box culvert segment 1.

[0031] Therefore, by arranging the double-layer precast cushion layer 4, the box culvert segment 1 is installed by sliding on the top layer 42, so that the box culvert segment 1 avoids scratching the waterproof roll 43, and then the waterproof roll 43 fully wraps the top layer 42 and the box culvert segment 1, further increasing the waterproof performance of the box culvert segment 1, thereby reducing the risk of leakage. Embodiment

[0032] A construction process of a precast box culvert structure includes the following steps: S1, precast cushion layer 4 installation, first horizontally lay and fix the bottom layer 41 on the ground, then lay the waterproof roll 43 on the bottom layer 41, and extend the two ends of the waterproof roll 43 outward, then lay and fix the top layer 42 on the waterproof roll 43, and stagger the joints between the top layer 42 and the joints of the bottom layer 41.

[0033] S2, box culvert segment 1 installation, the inflatable rubber ring 13 is sleeved on the plug 11, the elastic rubber ring 14 is embedded in the insertion groove 12, the first box culvert segment 1 is hoisted to the end position, the center line and the side line of the box culvert segment 1 are aligned with the center line and the side line of the top layer 42, the first box culvert segment 1 is fixed, the middle position of the box culvert segment 1 is aligned with the joint of the top layer 42, the next box culvert segment 1 is placed on the top layer 42, the center line and the side line of the two box culvert segments 1 are adjusted to be aligned, the hydraulic jacking mechanism is used to push the box culvert segments 1 to be inserted and connected to each other, and the splicing joint of the adjacent two box culvert segments 1 is controlled within 10mm-12mm.

[0034] S3, steel strand 3 construction, the steel strand 3 is inserted from the tension groove 21 position of the first box culvert segment 1, and passes through the threading pipe 22 on the adjacent two box culvert segments 1, and is inserted out from the tension groove 21 position of the second box culvert segment 1, then one end of the steel strand 3 is fixed by using the anchorage device 31 in the tension groove 21 of the first box culvert segment 1, then the hydraulic jack is placed in the tension groove 21 of the second box culvert segment 1, and the steel strand 3 passes through the hydraulic jack, then the hydraulic jack is started to realize the tensioning of the steel strand 3, so that the second box culvert segment 1 is close to the first box culvert segment 1, until the joint is 3mm-5mm, the other end of the steel strand 3 is fixed by using the anchorage device 31 in the tension groove 21 of the second box culvert segment 1, and finally the hydraulic jack is removed, and the excess steel strand 3 is cut off, and in this way, the box culvert segments 1 are connected and tensioned, then the cement slurry is injected into the threading pipe 22 along the grouting hole 23, and the threading pipe 22 is filled, and then the fine stone concrete is used to fill and smooth the tension groove 21.

[0035] S4, internal waterproof construction, the joint of the box culvert segment 1 is polished by using a grinding wheel or a steel wire brush, and loose and weak parts are removed, then the floating dust is cleaned by using a brush or a hand-held blower, if the joint is wet, the surface can be dried by using a hot air blower or a blowtorch, then the 30-50mm wide masking tape is pasted at the position of 10mm from the non-sealing area of the joint, then the flexible filling material is filled into the joint, so that the depth of the joint is 10mm-15mm, so as to control the injection depth, then the polysulfide sealant 15 is embedded into the joint, after the embedding is full, the putty knife is used for scraping and troweling, so that the inside is dense, and the surface is smooth and flat.

[0036] S5, waterproof spraying construction, the polyurethane waterproof coating layer 16 is uniformly sprayed on the inner wall of the box culvert segment 1 for three times, and the interval is 30min each time, and the thickness of each polyurethane waterproof coating layer 16 is 1mm.

[0037] S6, external waterproof construction, the waterproof roll 43 between the bottom layer 41 and the top layer 42 is wrapped upwards, and all the top layer 42 and the box culvert segment 1 are fully wrapped.

[0038] The specific embodiments are only an explanation of the application, and are not a limitation of the application, and the person skilled in the art can make modifications to the embodiments without creative contribution according to the needs after reading the specification, and as long as the modifications are within the scope of the claims of the application, the application is protected by the patent law.

Claims

1. A precast box culvert structure, characterized by: The utility model relates to a box culvert segment (1) is provided with the plug (11) one end, and the other end is provided with the insertion slot (12) for the plug (11) insertion, and the box culvert segment (1) is provided with the tensioning seat (2) in the inner wall, and the tensioning seat (2) is provided with the tensioning slot (21) in the outer wall, and the steel strand (3) is provided with the anchor (31) in the tensioning slot (21) in the both ends. The tensioning seat (2) is provided with the grouting hole (23) in the through line pipe (22). The plug (11) and the insertion slot (12) are provided with the expansion rubber ring (13) in the inner wall. The plug (11) is provided with the expansion rubber ring (13) in the outer wall.

2. The precast box culvert structure of claim 1, wherein: The insertion slot (12) is provided with the elastic rubber ring (14) in the inner wall.

3. The precast box culvert structure of claim 1, wherein: The box culvert segment (1) is provided with the polyurethane waterproof coating (16) in the inner wall.

4. The precast box culvert structure of claim 3, wherein: The utility model further includes the prefabricated cushion layer (4), and the prefabricated cushion layer (4) includes the bottom layer (41) and the top layer (42), the top layer (42) is located the bottom layer (41) top, the bottom layer (41) width is greater than the width of the top layer (42), and the both sides of the top layer (42) are flush with the both sides of the box culvert segment (1), and the waterproof coiled material (43) is arranged between the bottom layer (41) and the top layer (42).

5. The precast box culvert structure of claim 4, wherein: The utility model includes the following steps:

6. The precast box culvert structure of claim 5, wherein: S1, prefabricated cushion layer (4) installation, first the bottom layer (41) horizontal laying is fixed on the ground, then the waterproof coiled material (43) is laid on the bottom layer (41), and the both ends of waterproof coiled material (43) extend outward, then the top layer (42) is laid and fixed on the waterproof coiled material (43), and the joint between the top layer (42) is staggered with the joint of the bottom layer (41).

7. The precast box culvert structure according to claim 1, wherein: ​ 8. The precast box culvert structure of claim 1, wherein: ​ 9. A construction process of a precast box culvert structure, characterized in that: ​ ​ S2, box culvert segment (1) installation, set the expansion rubber ring (13) on the plug (11), embedded in the slot (12) in the elastic rubber ring (14), and then the first box culvert segment (1) is hoisted to the end position, and the center line and the side line of the box culvert segment (1) are aligned with the center line and the side line of the top layer (42), the first box culvert segment (1) is fixed, the middle position of the box culvert segment (1) is aligned with the joint of the top layer (42), the next box culvert segment (1) is placed on the top layer (42), the center line and the side line of the two box culvert segments (1) are adjusted, the hydraulic jacking mechanism is used to push the box culvert segments (1) to be inserted and connected, and the joint of the adjacent two box culvert segments (1) is controlled within 10mm-12mm; S3, steel strand (3) construction, steel strand (3) is inserted from the tension groove (21) of the first box culvert segment (1), and passes through the threading pipe (22) on the adjacent two box culvert segments (1), and then is pulled out from the tension groove (21) of the second box culvert segment (1), then one end of the steel strand (3) is fixed in the tension groove (21) of the first box culvert segment (1) by using the anchor (31), then the hydraulic jack is placed in the tension groove (21) of the second box culvert segment (1), and the steel strand (3) passes through the hydraulic jack, then the hydraulic jack is started to realize the tension of the steel strand (3), so that the second box culvert segment (1) is close to the first box culvert segment (1), until the joint is tensioned to 3mm-5mm, then the other end of the steel strand (3) is fixed in the tension groove (21) of the second box culvert segment (1) by using the anchor (31), finally the hydraulic jack is removed, and the excess steel strand (3) is cut off, in this way, the box culvert segments (1) are connected and tensioned, then the cement slurry is injected into the threading pipe (22) along the grouting hole (23), and the threading pipe (22) is filled, and then the fine aggregate concrete is used to fill and smooth the tension groove (21); S4, internal waterproof construction, the joint of the box culvert segment (1) is polished with a grinding wheel or a steel wire brush, and loose and weak parts are removed, then the dust is cleaned with a brush or a hand-held blower, if the joint is wet, the surface can be dried with a hot air blower or a torch, then a 30-50mm wide masking tape is attached to the non-sealing area of the joint on both sides, then the joint is filled with polyethylene closed-cell foam board, so that the depth of the joint is 10mm-15mm, which is used to control the injection depth, then the polysulfide sealant (15) is embedded into the joint, after filling, the putty knife is used for scraping and troweling, so that the inside is dense and the surface is smooth; S5, waterproof spray construction, the polyurethane waterproof coating layer (16) is uniformly sprayed on the inner wall of the box culvert segment (1) in three times, and the interval is 30min each time, and the thickness of each layer of polyurethane waterproof coating layer (16) is 1mm; S6, waterproof construction, the waterproof material (43) between the bottom layer (41) and the top layer (42) is wrapped upwards, and all the top layer (42) and the box culvert segment (1) are fully wrapped.

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