A split precast box culvert

Abstract

This application relates to the technical field related to culvert construction, and discloses a split precast culvert. In order to solve the problems that precast culverts are not easy to transport and assemble, the culvert is divided into a culvert cover plate and a culvert support plate, which are manufactured separately. During transportation, due to the plate-shaped culvert cover plate and culvert support plate, the occupied space can be reduced, and transportation can be achieved by stacking, increasing the number of culverts transported at one time, achieving the effect of easy transportation. At the same time, during the on-site assembly process, a crane with a relatively small load-bearing capacity can be used to lift the culvert cover plate or the culvert support plate individually, reducing the use of high-power cranes, thereby reducing the use cost. Moreover, the culvert cover plate and the culvert support plate are connected by connecting screws, so that a complete culvert can be assembled by splicing two culvert cover plates and two culvert support plates, achieving the effect of easy assembly.

Description

Technical Field

[0001] This application relates to the technical field related to culvert construction, and in particular, to a split precast culvert. Background Art

[0002] A culvert refers to a culvert whose body is built with reinforced concrete box pipe sections. It consists of one or more square or rectangular cross-sections, usually made of reinforced concrete. The construction of a culvert generally adopts in-situ casting. A bottom layer is set in the excavated trench, a layer of concrete cushion is poured, and the processed steel bars are then tied on-site. The inner formwork and outer formwork are supported. For larger culverts, generally the bottom slab and the lower half of the side walls are first poured, and then the steel bars of the upper part of the side walls and the top slab are tied. The inner and outer formworks are well supported, and the upper half of the side walls and the top slab are poured. After the concrete reaches the designed strength, the formwork is removed, and the soil is backfilled on both sides of the culvert at the same time.

[0003] When constructing by the in-situ casting method, it is necessary to set up formwork on-site before pouring, with a long construction period and high costs. For a small number of precast concrete culverts assembled by splicing, the operation is simple. After precasting culverts of appropriate sizes, the culverts are directly spliced and fixed by a crane. However, in actual use, due to the relatively large volume and heavy weight of the precast fixed-size culverts, during transportation, due to the limited space of the transport vehicle, a single formed culvert occupies a lot of space, resulting in low transport efficiency. Also, during the splicing process, a crane with a greater load-bearing capacity is required. It can be seen from this that although precast complete culverts are more convenient than in-situ casting, during the transportation and assembly processes, the efficiency is relatively low and the usage cost is relatively increased. Summary of the Invention

[0004] This application provides a split precast culvert, which has the advantages of being easy to transport and assemble on-site, so as to solve the problem that precast culverts are not easy to transport and assemble proposed in the above background art.

[0005] To achieve the above object, this application adopts the following technical solution: A split precast culvert, comprising: a culvert cover plate and a culvert support plate, both of which are plate-shaped, easy to stack and transport to reduce the occupied space; positioning holes are opened on the surface of the culvert cover plate, and a threaded part located at the bottom of the positioning hole is provided in the culvert cover plate; a connecting screw rod is movably installed at the end of the culvert support plate, and a transmission guide rod is movably sleeved on the surface of the connecting screw rod; a positioning head is fixedly connected to the end of the transmission guide rod, and a top spring is connected between the positioning head and the connecting screw rod; the positioning head realizes installation pre-positioning by being pushed into the threaded part. After positioning is completed, the connecting screw rod is screwed into the threaded part under the guidance of the positioning head; two culvert cover plates and two culvert support plates are assembled together through the connecting screw rod, which is easy to handle and assemble on-site.

[0006] Further, four positioning holes are opened on the surface of the culvert cover plate.

[0007] Furthermore, the positioning head is made of rubber, and the top of the positioning head is conical.

[0008] Furthermore, the shape of the transmission guide rod is a cuboid.

[0009] Furthermore, it further includes: a guide groove opened at the end of the culvert support plate; an active push plate and a passive baffle, which are symmetrically arranged at the end of the culvert support plate and located in the guide groove; two fastening tooth rows respectively installed on the inner sides of the passive baffle and the active push plate, and the sides of the two fastening tooth rows are slidably connected; a passive push tube fixed to the inner side of the passive baffle, an active push tube movably sleeved with the passive push tube is fixedly installed on the active push plate, and the end of the active push tube communicates with the slurry inlet pipe fixed to the outside of the active push plate; after the concrete is filled into the inner cavity of the passive push tube through the slurry inlet pipe, the active push plate and the passive baffle move away from each other; a discharge groove is opened in the middle of the passive push tube, and the on-off of the discharge groove is realized on the outside of the active push tube; a tightening gear is movably installed on the culvert support plate, and the tightening gear is sleeved outside the connecting screw rod, and the tightening gear meshes with the external teeth of the fastening tooth row.

[0010] Furthermore, the shapes of both the passive baffle and the active push plate are cuboids.

[0011] Furthermore, a liquid pushing cavity is opened inside the connecting screw rod, a transmission medium is injected into the liquid pushing cavity, the bottom of the connecting screw rod is movably connected with a liquid guide pipe communicated with the liquid pushing cavity, a limiting box located below the fastening tooth row is fixed on the culvert support plate, and the other end of the liquid guide pipe communicates with the inner cavity of the limiting box. A locking rod is movably installed inside the limiting box, a return spring is arranged between the locking rod and the limiting box, and the elastic force of the return spring makes the locking rod always have a tendency to eject outwards. A transport hole is opened on the fastening tooth row, and when the locking rod is inserted into the two transport holes, the movement of the passive baffle and the active push plate is restricted. A detection groove is opened in the middle of the fastening tooth row, and when the locking rod abuts against the detection groove, the movement of the active push plate towards the outside of the culvert support plate is restricted.

[0012] Furthermore, an anti - detachment hole having the same shape as the transport hole is opened on the fastening tooth row.

[0013] Furthermore, the outer diameter value of the positioning head is greater than the inner diameter value of the threaded part, and the positioning hole is composed of a round hole and a threaded part. The round hole is located at the end of the threaded part, and the inner diameter value of the round hole is less than the inner diameter value of the threaded part.

[0014] Furthermore, pressure - relief bolts are symmetrically arranged on the side of the active push plate, and the pressure - relief bolts are located on the outermost side of the active push plate.

[0015] The present invention has the following beneficial effects:

[0016] A split precast culvert provided by the present application is divided into a culvert cover plate and a culvert support plate, which are separately manufactured. During transportation, since the plate-shaped culvert cover plate and culvert support plate can reduce the occupied space, transportation can be achieved by stacking, increasing the number of culverts transported at one time and achieving the effect of easy transportation.

[0017] Meanwhile, during on-site assembly, it is only necessary to lift the culvert cover plate or the culvert support plate individually with a crane with a relatively small load-bearing capacity, reducing the use of high-power cranes, thereby reducing the usage cost. Moreover, the culvert cover plate and the culvert support plate are connected by connecting screw rods, so that a complete culvert is formed by splicing two culvert cover plates and two culvert support plates, achieving the effect of easy assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles disclosed in the present application.

[0019] With reference to the drawings, the present application can be more clearly understood according to the following detailed description, where:

[0020] Figure 1 is an overall partial perspective sectional view;

[0021] Figure 2 is an overall external shape structure diagram;

[0022] Figure 3 is an overall top view structure diagram;

[0023] Figure 4 is Figure 3 the sectional view structure diagram at A-A in

[0024] Figure 5 is Figure 3 the sectional view structure diagram at B-B in

[0025] Figure 6 is Figure 3 the sectional view structure diagram at C-C in

[0026] Figure 7 is the three-dimensional structure diagram of the culvert cover plate;

[0027] Figure 8 is the three-dimensional structure diagram of the culvert support plate;

[0028] Figure 9 is the three-dimensional structure diagram of the connecting screw rod;

[0029] Figure 10 is the overall schematic diagram after the passive push tube and the active push tube are assembled;

[0030] Figure 11 is the three-dimensional diagram after the active push plate is assembled;

[0031] Figure 12 It is a three-dimensional view after the passive baffle is assembled.

[0032] In the figure: 1. Box cover plate; 100. Positioning hole; 101. Threaded part; 2. Positioning top head; 3. Connecting screw; 300. Liquid pushing cavity; 4. Passive baffle; 5. Passive push tube; 500. Discharge chute; 6. Active push tube; 7. Box culvert support plate; 700. Guide groove; 8. Fastening tooth row; 800. Anti-detachment hole; 801. Transportation hole; 802. Detection groove; 9. Active push plate; 900. Slurry inlet pipe; 901. Pressure relief bolt; 10. Top spring; 11. Transmission guide rod; 12. Tightening gear; 13. Locking rod; 14. Return spring; 15. Limit box; 16. Liquid guide pipe. Specific implementation manners

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0034] Embodiment 1

[0035] Currently, the assembled box culvert is as shown in Figure 2 and in combination with Figure 7 and Figure 8 it can be seen that when the box culvert is prefabricated, it is divided into a box cover plate 1 and a box culvert support plate 7. Both the box cover plate 1 and the box culvert support plate 7 are flat plates. Thus, during the transportation by truck, stacking the box cover plate 1 and the box culvert support plate 7 together can increase the single transportation volume and improve the transportation efficiency. Compared with the existing directly formed box culvert, the box culvert in the present application can greatly reduce the occupied space during transportation.

[0036] Referring to Figure 1 and Figure 3 it can be seen that positioning holes 100 are provided on the surface of the box cover plate 1. The positioning holes 100 are cylindrical holes. Four positioning holes 100 are provided on the surface of one box cover plate 1. Two positioning holes 100 are in a group. The positioning holes 100 in a group are symmetrically arranged on the same side of the box cover plate 1. The two groups of positioning holes 100 are symmetrically arranged. In combination with Figure 4 it can be seen that threaded parts 101 are provided at the bottoms of the positioning holes 100 in the box cover plate 1. The number of the threaded parts 101 corresponds to the number of the positioning holes 100, ensuring that each positioning hole 100 contains one threaded part 101.

[0037] The end of the box culvert support plate 7 is movably installed with a connecting screw 3, and the central axis of the connecting screw 3 and the central axis of the threaded part 101 are in a straight line. The connecting screw 3 can only move back and forth along the central axis. A transmission guide rod 11 is movably sleeved on the surface of the connecting screw 3. A positioning head 2 is fixedly connected to the end of the transmission guide rod 11. A top spring 10 is connected between the positioning head 2 and the connecting screw 3. When the box culvert cover plate 1 is placed on the box culvert support plate 7, since the positioning head 2 is made of rubber and the top of the positioning head 2 is conical, it is easier for the positioning head 2 to penetrate into the threaded part 101, so as to realize the installation and positioning between the box culvert cover plate 1 and the box culvert support plate 7.

[0038] During the splicing process of the box culvert cover plate 1 and the box culvert support plate 7, first place the box culvert cover plate 1 at the required position. Then, according to the crane, vertically arrange the box culvert support plate 7 at one end of the box culvert cover plate 1. During the placement process, since the positioning head 2 is pushed out by the elastic force of the top spring 10 and the positioning head 2 abuts against the threaded part 101, the positioning between the box culvert cover plate 1 and the box culvert support plate 7 can be realized. Finally, after the positioning is completed, by turning the connecting screw 3, the connecting screw 3 drives the positioning head 2 to rotate. Since the positioning head 2 is made of rubber, when the positioning head 2 rotates, it will move along the threaded part 101 in the direction away from the box culvert support plate 7 until the connecting screw 3 is screwed into the threaded part 101. Thus, through the threaded connection between the connecting screw 3 and the threaded part 101, the stability of the connection between the box culvert support plate 7 and the box culvert cover plate 1 is ensured.

[0039] The shape of the transmission guide rod 11 is a cuboid. Figure 9 It can be seen that when the transmission guide rod 11 moves in the connecting screw 3, it can only reciprocate along the central axis of the connecting screw 3. When the connecting screw 3 rotates, the transmission guide rod 11 can transmit the torque to the positioning head 2, so that the positioning head 2 rotates synchronously with the connecting screw 3.

[0040] Embodiment 2

[0041] On the basis of Embodiment 1, please refer to Figure 1 and Figure 6 , in order to facilitate the screwing of the connecting screw 3 into the threaded part 101 and, after screwing in, enhance the connection strength between the box culvert support plate 7 and the box culvert cover plate 1, in this Embodiment 2, a guide groove 700 is opened at the end of the box culvert support plate 7. The guide groove 700 is a rectangular groove with an upward opening, and a driving push plate 9 and a passive baffle 4 located in the guide groove 700 are movably installed at the end of the box culvert support plate 7. The materials and shapes of the driving push plate 9 and the passive baffle 4 are the same. Figure 10It can be seen that the shapes of the passive baffle 4 and the active push plate 9 are cuboids. Thus, when the passive baffle 4 and the active push plate 9 are placed in the guiding groove 700, after the box cover plate 1 is pre-positioned by the positioning head 2, its installation position is determined. When the box cover plate 1 is close to the box culvert support plate 7, the box cover plate 1 will also press on the passive baffle 4 and the active push plate 9. A groove shape symmetrical to the guiding groove 700 is provided on the box cover plate 1, which can perform secondary positioning according to the passive baffle 4 and the active push plate 9 to ensure the accuracy of connection. Combining Figures 11 - 12 It can be seen that fastening tooth rows 8 are fixedly connected to the inner sides of both the passive baffle 4 and the active push plate 9, and the sides of the two fastening tooth rows 8 are slidably connected. The passive push tube 5 is fixed to the inner side of the passive baffle 4, and the outside of the passive push tube 5 is movably installed at the end of the box culvert support plate 7 according to the guiding hoop. An active push tube 6 that is movably sleeved with the passive push tube 5 is fixedly installed on the active push plate 9, and the end of the active push tube 6 is communicated with the grout inlet pipe 900 fixed to the outside of the active push plate 9. After the external concrete is added to the grout inlet pipe 900, the concrete will be transported through the grout inlet pipe 900 to the inner cavity of the passive push tube 5 via the active push tube 6. As the concrete in the inner cavity of the passive push tube 5 increases, it forces the passive baffle 4 and the active push plate 9 to move away from each other, causing the passive baffle 4 and the active push plate 9 to drive the fastening tooth rows 8 to move.

[0042] A discharge chute 500 is opened in the middle of the passive push tube 5. Only after the moving distance between the passive baffle 4 and the active push plate 9 reaches the maximum limit, the active push tube 6 moves away from the discharge chute 500, making the discharge chute 500 communicate with the inner cavity of the passive push tube 5.

[0043] Combining Figure 4 、 Figure 9 and Figure 10 it can be known that the tightening gear 12 is movably installed on the box culvert support plate 7 and is sleeved outside the connecting screw 3. When the connecting screw 3 moves up and down, the tightening gear 12 will not move along. When the tightening gear 12 rotates, the connecting screw 3 will rotate following the tightening gear 12. There are two tightening gears 12, and the two tightening gears 12 are respectively engaged with the two fastening tooth rows 8 one by one. Thus, during the movement of the fastening tooth rows 8, it will force the tightening gear 12 to drive the connecting screw 3 to rotate synchronously, making it easy for the connecting screw 3 to be screwed into the threaded part 101.

[0044] During use: After the box cover plate 1 and the box culvert support plate 7 are positioned and fitted together by the positioning head 2, by injecting concrete with a certain pressure into the grout inlet pipe 900, as the concrete in the passive push tube 5 increases, it will push the passive baffle 4 and the active push plate 9 to move away from each other. At this time, the active push tube 6 blocks the discharge chute 500, and the concrete only exists in the inner cavity of the passive push tube 5.

[0045] During the movement of the passive baffle 4 and the active push plate 9, the fastening tooth row 8 will be driven to move relatively. During the movement of the fastening tooth row 8, the tightening gear 12 rotates synchronously. The rotation of the tightening gear 12 will cause the connecting screw 3 and the positioning head 2 to rotate synchronously until the connecting screw 3 is screwed into the threaded part 101, thereby realizing the threaded connection and fixation between the box cover plate 1 and the box culvert support plate 7.

[0046] As concrete is continuously input into the inner cavity of the passive push pipe 5 until the active push plate 9 and the passive baffle 4 reach the side of the box culvert support plate 7, the active push pipe 6 no longer blocks the discharge chute 500. At this time, the input concrete will enter the sealed guide groove 700 formed by the passive baffle 4, the active push plate 9, the box culvert support plate 7 and the box cover plate 1, thereby enhancing the connection strength by filling concrete between the box cover plate 1 and the box culvert support plate 7. The concrete can wrap the connecting screw 3, on the one hand, strengthening the connection strength of the connecting screw 3, and on the other hand, the solidified concrete prevents the connecting screw 3 from rotating due to vibration, thus avoiding the phenomenon that the connecting screw 3 disengages from the threaded part 101.

[0047] When the present application fills concrete into the slurry inlet pipe 900, the sealed space can be obtained after the box cover plate 1 and the box culvert support plate 7 are assembled, without on-site arrangement, thus reducing the time for manually setting up the formwork and ultimately accelerating the assembly speed.

[0048] Embodiment III

[0049] On the basis of further improvement of Embodiment II, when filling concrete into the guide groove 700 in Embodiment II, if the inside of the guide groove 700 is not tightly sealed or the connecting screw 3 is not properly connected to the threaded part 101, it will cause the problem of concrete leakage. To solve such problems, in this Embodiment III, before filling concrete into the guide groove 700, the airtightness of the guide groove 700 is detected first. Please refer to Figure 4 and Figure 5 It can be seen that a liquid pushing cavity 300 is formed inside the connecting screw 3, and the liquid pushing cavity 300 is filled with a sufficient amount of transmission medium, such as hydraulic oil. The bottom of the connecting screw 3 is movably connected with a liquid guide pipe 16 communicating with the liquid pushing cavity 300, and the other end of the liquid guide pipe 16 communicates with the inner cavity of the limiting box 15. The limiting box 15 is fixedly installed on the box culvert support plate 7 and is located below the fastening tooth row 8, and a locking rod 13 is movably installed inside the limiting box 15. A return spring 14 is arranged between the locking rod 13 and the limiting box 15. Due to the elastic force of the return spring 14, the locking rod 13 always has a tendency to push outwards. When the positioning head 2 is pressed downwards, the transmission guide rod 11 is inserted into the inner cavity of the connecting screw 3, and the transmission medium filled in the inner cavity of the connecting screw 3 will flow into the limiting box 15 through the liquid guide pipe 16. When the medium in the limiting box 15 increases, the locking rod 13 will be retracted into the limiting box 15 and press the return spring 14.

[0050] Combined withFigure 11 and Figure 12 As can be seen, a transportation hole 801 is formed in the fastening tooth row 8. When the two transportation holes 801 are penetrated by the locking rod 13, the distance between the passive baffle 4 and the active push plate 9 is the shortest. Moreover, through the restriction of the locking rod 13, during the handling process of the culvert support plate 7, the active push plate 9 and the passive baffle 4 will not move, ensuring the stability of transportation.

[0051] A detection groove 802 is formed in the middle of one fastening tooth row 8. Combining Figure 5 As can be seen, the detection groove 802 is located below the fastening tooth row 8 on the passive baffle 4. When the locking rod 13 abuts in the detection groove 802, it will restrict the active push plate 9 from moving outward to the outside of the culvert support plate 7.

[0052] The fastening tooth row 8 is provided with an anti - detachment hole 800 having the same shape as the transportation hole 801, and the detection groove 802 is located between the transportation hole 801 and the anti - detachment hole 800. When the distance between the active push plate 9 and the passive baffle 4 is the farthest, the anti - detachment holes 800 on the two fastening tooth rows 8 coincide.

[0053] During use:

[0054] When the culvert cover plate 1 is installed on the culvert support plate 7, positioning is carried out through the threaded portion 101 and the positioning head 2, thereby determining the installation position of the culvert cover plate 1. Combining Figure 4 As can be seen, since the outer diameter of the positioning head 2 is slightly larger than the inner diameter of the threaded portion 101, and the positioning hole 100 is composed of a round hole and the threaded portion 101, the round hole is located at the end of the threaded portion 101, and the inner diameter of the round hole is slightly smaller than the inner diameter of the threaded portion 101. When the culvert cover plate 1 is inserted into the culvert support plate 7, the threaded portion 101 will first push against the positioning head 2 to compress the top spring 10. At the same time, the connecting screw 3 will tend to move into the culvert support plate 7. Until the connecting screw 3 moves downward to the limit and the top spring 10 cannot be compressed anymore, the positioning head 2 will be forced into the threaded portion 101 to achieve pre - positioning. After that, re - positioning is carried out through the active push plate 9 and the passive baffle 4 to ensure the accuracy of positioning.

[0055] When the positioning head 2 is pressed downward, the transmission medium in the liquid - pushing cavity 300 will be input into the limiting box 15 along the liquid - guiding pipe 16, causing the locking rod 13 to disengage from the transportation hole 801. The passive baffle 4 and the active push plate 9 are no longer restricted. Since the positioning head 2 is stuck in the threaded portion 101 at this time, the top spring 10 cannot make the positioning head 2 move in the threaded portion 101 through its elastic force, thereby ensuring that the locking rod 13 is always disengaged from the transportation hole 801.

[0056] Concrete is filled into the active pushing pipe 6. As the amount of concrete transported in the inner cavity of the passive pushing pipe 5 continuously increases, it will force the passive baffle 4 and the active push plate 9 to move relatively away from each other. When the passive baffle 4 and the active push plate 9 move, the transport hole 801 moves away from the locking rod 13. As the passive baffle 4 and the active push plate 9 drive the fastening tooth row 8 to move respectively, it forces the fastening tooth row 8 to drive the tightening gear 12 to rotate. The rotation of the tightening gear 12 causes the positioning head 2 to rotate synchronously. When the positioning head 2 rotates in the threaded part 101, the rubber on the outer part of the positioning head 2 will press against the thread. When the positioning head 2 rotates, it moves towards the round hole of the positioning hole 100 until the connecting screw 3 is screwed into the threaded part 101. At this time, the positioning head 2 moves into the round hole of the positioning hole 100, and the elastic force of the top spring 10 enables the positioning head 2 to slide in the round hole. Further, the positioning head 2 is pushed upward, the transmission guide rod 11 moves upward synchronously, the transmission medium in the limiting box 15 decreases, and the locking rod 13 moves upward under the elastic force of the return spring 14. Due to the movement of the active push plate 9, the upward moving locking rod 13 will be in the detection groove 802, and the end of the locking rod 13 abuts against the side of another fastening tooth row 8.

[0057] During the process of the passive baffle 4 and the active push plate 9 moving away from each other, since external air flow cannot supplement the guide groove 700, when the detection groove 802 abuts against the locking rod 13 and restricts the movement of the active push plate 9, the concrete in the inner cavity of the passive pushing pipe 5 will enable the passive baffle 4 to still move in the direction away from the active push plate 9, resulting in a decrease in the pressure in the guide groove 700. The pressure in the guide groove 700 causes the pressure below the positioning head 2 to also decrease through the thread gap between the connecting screw 3 and the threaded part 101, forcing the positioning head 2 to move towards the box culvert support plate 7 and compress the top spring 10. At this time, the locking rod 13 moves downward again. The separation of the locking rod 13 from the detection groove 802 enables the movement of the active push plate 9 to be no longer restricted. The concrete in the inner cavity of the passive pushing pipe 5 is continuously filled, causing the active push plate 9 to move in the direction away from the passive baffle 4 until the distance between the active push plate 9 and the passive baffle 4 is the largest, and the discharge groove 500 is opened. At the same time, when the movement distance between the passive baffle 4 and the active push plate 9 is the largest, the anti - detachment holes 800 coincide above the locking rod 13. After the inner cavity of the passive pushing pipe 5 is communicated with the guide groove 700 through the discharge groove 500, the pressure in the guide groove 700 is relieved, and the elastic force of the top spring 10 will push the positioning head 2 outwards along the round hole. The locking rod 13 moves upward again and is inserted into the two anti - detachment holes 800, thereby restricting the passive baffle 4 and the active push plate 9 from moving. Finally, with the continuous injection of concrete into the guide groove 700, the secondary fastening connection between the box culvert cover plate 1 and the box culvert support plate 7 is realized.

[0058] When there is a gap leak between the box covering plate 1 and the box culvert support plate 7, the external air flow will be sucked into the guide groove 700, resulting in a continuous decrease in the pressure in the guide groove 700. The top spring 10 will push the positioning head 2 outwards by elastic force, causing the locking rod 13 to be stuck in the detection groove 802. At this time, the discharge groove 500 will never be opened, and external personnel can know whether there is a leak by whether the concrete is normally filled, so that the installation positioning can be carried out again after maintenance.

[0059] Under normal conditions, after a connecting screw 3 is first screwed into the threaded part 101, as the screwing distance between the connecting screw 3 and the threaded part 101 increases, the screwing strength will also increase relatively, resulting in a relatively greater resistance to the movement of the tightening gear 12. During the process of filling the inner cavity of the passive pushing tube 5 with concrete, the passive pushing tube 5 and the active pushing tube 6 have relatively equal pressures and move away from each other. When the movement resistance of the passive pushing tube 5 increases, as the applied force is increased, the applied force of the active pushing tube 6 will also increase relatively, that is, the movement stroke increases, and finally the other connecting screw 3 is quickly screwed into the threaded part 101.

[0060] Since the positioning head 2 is always in the threaded part 101, as the connecting screw 3 rotates, according to the threaded part 101, the positioning head 2 will always move away from the connecting screw 3. It can be concluded that when the positioning head 2 is in the threaded part 101, the length of the positioning head 2 from the connecting screw 3 is relatively large. When the connecting screw 3 is not normally screwed into the threaded part 101, since the positioning head 2 is not retracted into the connecting screw 3 at this time, the locking rod 13 is still pushed out, and the air flow can enter the guide groove 700 through the gap between the outside of the positioning head 2 and the threaded part 101, so that the pressure in the guide groove 700 will not decrease. The locking rod 13 continuously pushes against the detection groove 802, thus restricting the movement of the active push plate 9, and the concrete will not be filled into the guide groove 700, which is convenient for subsequent sealing inspection.

[0061] Embodiment Four

[0062] As a supplement to Embodiment Three, please refer to Figure 10 and Figure 11 , since there is a certain amount of air flow in the guide groove 700 itself during the process of filling the concrete into the guide groove 700, in order to reduce the air flow rate in the guide groove 700, in this Embodiment Four, pressure relief bolts 901 are symmetrically arranged on the side of the active push plate 9, and the pressure relief bolts 901 are located on the outermost side of the active push plate 9, combined with Figure 1It can be seen that since both the upper and lower parts of the box culvert support plate 7 need to be connected to the box culvert cover plate 1, when the lower part of the box culvert support plate 7 is connected to the box culvert cover plate 1, it is only necessary to fill the guiding groove 700 with concrete for a period of time, and then loosen the pressure relief bolt 901 at the highest part, so as to discharge the air flow at the top in the guiding groove 700 to the outside. Moreover, after seeing that mud overflows from the pressure relief bolt 901, it can be known that the guiding groove 700 has been filled with excessive mud, and the supply of concrete can be stopped. Similarly, when the upper part of the box culvert support plate 7 is connected to the box culvert cover plate 1, it is also only necessary to loosen the pressure relief bolt 901 at the highest part.

Claims

1. A split precast box culvert, characterized in that, Including: The box covering plate and the box culvert supporting plate are both plate-shaped, which are easy to stack and transport, reducing the occupied space; The positioning hole is opened on the surface of the box covering plate, and a threaded part is arranged at the bottom of the positioning hole in the box covering plate; The connecting screw rod is movably installed at the end of the box culvert supporting plate, and a transmission guide rod is movably sleeved on the surface of the connecting screw rod; The positioning top head is fixedly connected to the end of the transmission guide rod, and a top spring is connected between the positioning top head and the connecting screw rod. The positioning top head is made of rubber, and the top of the positioning top head is conical; The positioning top head realizes pre-positioning of the installation by being pushed into the threaded part. After positioning, the connecting screw rod is screwed into the threaded part under the guidance of the positioning top head; Two box covering plates and two box culvert supporting plates are assembled together by the connecting screw rod, which is easy to handle and assemble on site; The guiding groove is opened at the end of the box culvert supporting plate; The active push plate and the passive baffle are symmetrically arranged at the end of the box culvert supporting plate and are located in the guiding groove; There are two fastening tooth rows, which are respectively installed on the inner sides of the passive baffle and the active push plate, and the sides of the two fastening tooth rows are slidably connected; The passive push tube is fixed on the inner side of the passive baffle. The active push plate is fixedly installed with an active push tube that is movably sleeved with the passive push tube, and the end of the active push tube is communicated with the slurry inlet pipe fixed to the outside of the active push plate; After the concrete is filled into the inner cavity of the passive push tube through the slurry inlet pipe, the active push plate and the passive baffle move away from each other; The discharge groove is opened in the middle of the passive push tube, and the on-off of the discharge groove is realized on the outside of the active push tube; The tightening gear is movably installed on the box culvert supporting plate, and the tightening gear is sleeved on the outside of the connecting screw rod. The tightening gear meshes with the external teeth of the fastening tooth row; When the connecting screw rod moves up and down, the tightening gear will not move along. When the tightening gear rotates, the connecting screw rod will rotate following the tightening gear.

2. The split precast culvert according to claim 1, wherein, Four positioning holes are opened on the surface of the box covering plate.

3. The split precast box culvert according to claim 1, wherein, The shape of the transmission guide rod is a cuboid.

4. The split precast box culvert according to claim 1, wherein, The shapes of the passive baffle and the active push plate are both cuboids.

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