Prefabricated square culvert with joists

Abstract

The utility model discloses a prefabricated assembly type square culvert with a joist, and relates to a prefabricated assembly type concrete square culvert with a joist. The problem that the structural performance cannot be guaranteed due to fatigue failure of prestressed tie bars after the prefabricated square culvert bears heavy loads for multiple times is solved. The structure comprises an upper cross beam, a middle retaining wall, a lower beam, a plurality of culvert body pipe joints, a plurality of prestressed tie bars and the like, the culvert body pipe joints are connected end to end, and the upper cross beam, the middle retaining wall and the lower beam are sequentially connected from top to bottom to form a linear wall body; the pre-stress lacing wires provide mutual pressing pre-stress for the culvert body pipe joints and the straight-line-shaped wall body; the culvert body structure further comprises two joists, the two joists are attached to the lower surfaces of the culvert body pipe joints side by side, and the two ends of each joist are installed in the grooves reserved in the two lower beams respectively. When the prefabricated square culvert bears loads, the joists and the prestressed tie bars are stressed together, and the problem that the structural performance cannot be guaranteed after the prefabricated square culvert bears heavy loads for multiple times is solved.

Description

Technical Field

[0001] The utility model relates to a prefabricated and assembled concrete square culvert with a bearing beam. Background Art

[0002] At present, the existing multi - section prefabricated and assembled square culverts usually adopt post - tensioned unbonded prestressed tendons for connection. There is no strain coordination between the unbonded prestressed tendons and the surrounding concrete, that is, the prestressed tendons and the concrete can move relative to each other. The stress in the unbonded tendons will depend on the overall deformation of the component. Repeated heavy - load cycles will cause fatigue failure of the prestressed tendons, resulting in the inability to guarantee the structural performance of the prefabricated and assembled square culvert after multiple heavy - load applications. Summary of the Utility Model

[0003] In order to solve the above problems, the purpose of the utility model is to provide a prefabricated and assembled concrete square culvert with a bearing beam, so as to solve the problem that the structural performance of the prefabricated and assembled square culvert cannot be guaranteed due to fatigue failure of the prestressed tendons after multiple heavy - load applications.

[0004] The utility model provides a prefabricated and assembled concrete square culvert with a bearing beam, which comprises two identical upper cross - beams 1 - 1, four intermediate retaining walls 1 - 2, two lower beams 1 - 3, multiple culvert body pipe sections 2, multiple prestressed tendons and multiple high - strength bolts. All the culvert body pipe sections 2 are connected end to end, and are butted into an integral culvert pipe in the way of socket at the connection part with the same center line. The upper cross - beams 1 - 1, the intermediate retaining walls 1 - 2 and the lower beams 1 - 3 are connected in sequence from top to bottom, and are butted into an integral body at the connection part in the way of socket to form a one - word wall body 1. The two one - word wall bodies 1 are respectively located at the front end and the rear end of the integral culvert pipe. There is a central hole 1 - 4 at the center of the one - word wall body. The end of the culvert body pipe section 2 is inserted into the central hole 1 - 4. Part of the prestressed tendons 3 penetrate through the front end and the rear end of the integral culvert pipe and always provide prestress for mutually pressing the culvert body pipe sections 2. Another part of the prestressed tendons 13 penetrate through the upper cross - beams 1 - 1, the intermediate retaining walls 1 - 2 and the lower beams 1 - 3 of the one - word wall body 1 and always provide prestress for mutually pressing the one - word wall body 1. Part of the high - strength bolts 9 are used to connect adjacent culvert body pipe sections 2. Another part of the high - strength bolts 19 are used to connect the end of the integral culvert pipe with the one - word wall body 1. It also comprises two bearing beams 6. The two bearing beams 6 are arranged side by side and attached to the lower surface of multiple culvert body pipe sections 2. The two ends of the bearing beam 6 are respectively installed in the reserved grooves of the two lower beams 1 - 3.

[0005] In order to solve the problems existing in the prior art, the utility model reserves grooves in the lower beams of the one - word wall and installs the bearing beams in the grooves, so that the culvert body pipe sections are placed on the bearing beams. When the prefabricated and assembled square culvert bears the load, the bearing beams and the prestressed tendons bear the load together, solving the problem that the structural performance of the prefabricated and assembled square culvert cannot be guaranteed after multiple heavy - load applications. Brief Description of the Drawings

[0006] Figure 1 Schematic diagram of the three-dimensional structure of the present utility model; Figure 2 Top view of the present utility model; Figure 3 is Figure 2 A - A cross-sectional view of Figure 4 is Figure 2 F - F cross-sectional view of Figure 5 is Figure 2 B - B cross-sectional view of Figure 6 Side view of the present utility model; Figure 7 Schematic diagram of the structure of the specific implementation mode, Figure 8 is Figure 7 Enlarged schematic diagram at position H in Figure 9 Schematic diagram of the structure in which the outer bolt seats and bolts formed by the connecting bins 7 belonging to six culvert body pipe sections 2 respectively in the specific implementation mode fix the two adjacent culvert body pipe sections 2. Specific implementation mode

[0007] The following combines Figures 1 to 9 to illustrate this implementation mode. A prefabricated assembled square culvert with a supporting beam is composed of two identical upper crossbeams 1 - 1, four intermediate retaining walls 1 - 2, two lower beams 1 - 3, two supporting beams 6, multiple culvert body pipe sections 2, multiple prestressed tendons and multiple high-strength bolts; all the culvert body pipe sections 2 are connected end to end, and at the connection part, they are butted as a whole culvert with the socket method on the same center line; the upper crossbeams 1 - 1, the intermediate retaining walls 1 - 2 and the lower beams 1 - 3 are connected in sequence from top to bottom, and at the connection part, they are butted as a whole with the socket method to form a straight wall body 1; the two straight wall bodies 1 are respectively located at the front end and the rear end of the culvert connected as a whole, and there is a central hole 1 - 4 at the center of the straight wall body, and the ends of the culvert body pipe sections 2 are inserted into the central hole 1 - 4; part of the prestressed tendons 3 penetrate through the front end and the rear end of the culvert connected as a whole and always provide prestress for the mutual compression of the culvert body pipe sections 2; another part of the prestressed tendons 13 penetrate through the upper crossbeams 1 - 1, the intermediate retaining walls 1 - 2 and the lower beams 1 - 3 of the straight wall body 1 connected as a whole and always provide prestress for the mutual compression of the straight wall body 1; part of the high-strength bolts 9 are used to connect the adjacent culvert body pipe sections 2; another part of the high-strength bolts 19 are used to connect the ends of the whole culvert with the straight wall body 1; the two supporting beams 6 are arranged side by side and attached to the lower surface of multiple culvert body pipe sections 2, and the two ends of the supporting beam 6 are respectively installed in the grooves reserved in the two lower beams 1 - 3.

[0008] The supporting beam 6, the straight wall body 1 and the culvert body pipe section 2 are precast reinforced concrete bodies, and the prestressed tendons and the high-strength bolts are made of steel.

[0009] Preferably, the prestressed tension bars 3 are prestressed steel strands. During the process of setting prestress, one end of the prestressed tension bar 3 is fixed to one end of the integral culvert 2 or the one-piece wall 1 through a bearing plate 4, and then the other end of the prestressed tension bar 3 is pulled at the other end of the integral culvert 2 or the one-piece wall 1, so that prestress is generated inside the prestressed tension bar 3. A steel wedge 5 for preventing the prestressed tension bar from retracting is arranged at the outer surface of the culvert body section 2 close to the other end of the prestressed tension bar 3 and the outer surface of the one-piece wall 1.

[0010] Preferably, the culvert body section 2 is composed of six sections.

[0011] Preferably, there are eight prestressed tension bars. Four prestressed tension bars 3 are arranged at the four corner areas of the square pipe-shaped cross-section of the culvert body section 2. With such an arrangement, the solid area of the concrete member at the corner area is the largest, so the strength of the concrete is the best and it can withstand the maximum compressive force. These four prestressed tension bars 3 are symmetrically arranged with the center line of the culvert body section 2, which is easy to ensure the balance of the prestress force. The remaining four prestressed tension bars 13 are arranged on both sides of the two one-piece walls 1. With such an arrangement, the one-piece walls 1 can be better assembled into a whole and share the force together.

[0012] Preferably, the socket and spigot joints between the culvert body sections 2, the socket and spigot joints between the upper cross beam 1-1 and the middle retaining wall 1-2, and the socket and spigot joints between the middle retaining wall 1-2 and the lower beam 1-3 are all of the same taper fit between the outer square cone and the inner square cone, which can ensure the stability of the structure.

[0013] Preferably, there are two bearing beams 6. The bearing beams 6 are installed in the grooves reserved in the lower beam 1-3 and always provide a supporting force for the integral culvert. Such an arrangement can always provide a supporting force for the integral culvert, optimize the stress state of the integral culvert, and ensure that the deflection and the change of the inter-joint gap of the integral culvert are not too large. The bearing beams 6 can effectively reduce the deflection change of the precast assembled box culvert during the stress process and ensure that it can meet the requirements of the deflection change. The bearing beams 6 change the overall stress condition of the precast assembled box culvert. When there are bearing beams 6, the connection of the culvert body sections 2 can be regarded as semi-rigid connection, and without bearing beams, it can only be regarded as hinged connection. The bearing beams 6 are made of concrete and are internally provided with 11 prestressed tension bars.

[0014] Preferably, the pipe orifice connecting device is that a plurality of connecting bins 7 are arranged on the outer surface of the culvert body section 2 adjacent to the pipe orifice. The connecting bins 7 are recessed into the hole wall of the culvert body section 2 and form an outer bolt seat on its side. The connecting bins 7 on two adjacent culvert body sections 2 correspond to each other in pairs and are fixed into one body through high-strength bolts 9 for the outer bolt seats. The strength of each outer bolt seat is strengthened through a pre-embedded steel bar structure.

[0015] The connecting bin 7 is a groove reserved in the culvert body pipe section 2, and its function is to provide space for the installation and fastening of high-strength bolts 9. The connecting bin 7 is 100 mm away from the edge of the component. Bolt holes are formed here through embedded pipes. Every two culvert body pipe sections are connected into a whole by bolts passing through the reserved bolt holes. The connecting bin 7 is arranged on the outside of the culvert body pipe section, distributed on the left and right sides, and fastening forces can be formed around the culvert. The prestressed tension bars 3 and high-strength bolts 9 act together to connect all the components of the square culvert into a whole, ensuring the integrity and water-stop function of the square culvert.

[0016] The advantage of using the connecting bin 7 is that it can ensure the installation requirements. When the connecting bin 7 is placed on the outside, there is a large operating space during connection, which is conducive to the connection operation. When the connecting bin 7 is placed on the outside for sealing, only the waterproof property needs to be considered. At the same time, when placed on the outside, the overall performance of the connection of the components is good, and the stress cross-section is large after the components form a whole.

[0017] An installation process method for a prefabricated assembled square culvert, which includes the following installation steps:

[0018] I. Install two lower beams 1-3 at the specified positions according to the distance and mutual position requirements;

[0019] II. Install four middle retaining walls 1-2 in two groups on the two lower beams 1-3 respectively;

[0020] III. Install the supporting beam 6 in the reserved grooves of the two lower beams 1-3 according to the position requirements;

[0021] IV. Relying on the lower beams 1-3, the middle retaining walls 1-2 and the supporting beam 6, connect all the culvert body pipe sections 2 into an integral culvert pipe, so that the culvert body pipe sections 2 are connected end to end through socket joints; and fix between each culvert body pipe section 2 through the connecting bin 7 formed by the side wall of the connecting bin and high-strength bolts 9; the ends of the culvert body pipe sections 2 at the head and tail are inserted into the central holes 1-4;

[0022] V. Fix the parts of the lower beams 1-3 and the middle retaining walls 1-2 in contact with the culvert body pipe sections 2 through the embedded nut bodies 8 and high-strength bolts 19;

[0023] VI. Apply and maintain the prestress of mutual compression to the culvert body pipe sections 2 through the prestressed tension bars 3;

[0024] VII. Install the upper cross beam 1-1 on the middle retaining walls 1-2 and the culvert body pipe sections 2 and fix the parts of the upper cross beam 1-1 in contact with the culvert body pipe sections 2 through the embedded nut bodies 8 and high-strength bolts 19;

[0025] VIII. Then apply prestress to the one-word wall body 1 composed of the upper cross beam 1-1, the middle retaining walls 1-2 and the lower beams 1-3 through the prestressed tension bars 13; complete the prefabricated installation.

[0026] In the present utility model, all prefabricated components are made of C40 or C50 concrete. After standardized design, they are produced in a production line using a fixed mold according to standard components, which can greatly improve the production efficiency of the components. The production and curing processes are controlled by reliable technological processes and quality inspection measures, which can ensure the relevant requirements such as the strength, durability, and dimensions of the components, meeting the quality control requirements of prefabricated and assembled components.

[0027] The prefabricated and assembled square culvert effectively connects each component through various methods such as socket connection, bolt connection, and prestressed tension connection, enabling each independent component to finally form an integral whole and act together to achieve functions such as drainage and passage. The water-stop function between components is formed by water-stop structures and filling processes, etc. Since the components are prefabricated in the factory, there is only an assembly process on site, and the entire installation process can be completed within one working day, greatly reducing the pressure on traffic and the environment. The prefabricated and assembled square culvert has more advantages for large-scale implementation of projects. Components can be prefabricated when the farmland does not have construction conditions, and centralized installation can be carried out after the farmland is harvested, reducing the pressure on the supply of resources such as labor, materials, and machinery during the centralized implementation of the project, which is very beneficial for construction organization and effectively ensures the smooth implementation and commissioning of the project within a limited time.

Claims

1. A prefabricated assembled square culvert with a joist, comprising two identical upper cross beams (1-1), four intermediate retaining walls (1-2), two lower beams (1-3), a plurality of culvert body pipe sections (2), a plurality of prestressed tension bars and a plurality of high-strength bolts; all the culvert body pipe sections (2) are connected end to end and butted together at the same center line by means of a socket joint at the connection point to form an integral culvert; the upper cross beam (1-1), the intermediate retaining wall (1-2) and the lower beam (1-3) are sequentially connected from top to bottom and butted together at the connection point by means of a socket joint to form a whole, forming a straight wall body (1); the two straight walls (1) are respectively located at the front end and the rear end of the culvert body connected as a whole, A center hole (1-4) is provided at the center of the straight wall, and the end of the culvert body pipe section (2) is inserted into the center hole (1-4); part of the prestressed steel bars (3) penetrate the front and rear ends of the culvert pipe connected as a whole and always provide the culvert body pipe section (2) with prestressed stress for mutual compression; another part of the prestressed steel bars (13) penetrate the upper crossbeam (1-1), the middle retaining wall (1-2) and the lower beam (1-3) connected to form the straight wall (1) and always provide the straight wall (1) with prestressed stress for mutual compression; part of the high-strength bolts (9) are used to connect adjacent culvert body pipe sections (2); another part of the high-strength bolts (19) are used to connect the end of the whole culvert pipe and the straight wall (1); Features It also comprises two joists (6) which are arranged side by side on the lower surface of the multi-section culvert pipe section (2), and the ends of the joists (6) are respectively installed in the grooves reserved in the two lower beams (1-3).

2. A prefabricated assembled square culvert with joists according to claim 1, characterized in that: The supporting beam (6), the straight wall (1) and the culvert pipe section (2) are prefabricated reinforced concrete bodies, and the prestressed reinforcement bars and high-strength bolts are made of steel.

3. The prefabricated assembled square culvert with joists according to claim 1, characterized in that: The prestressed steel strands are selected as the prestressed steel bars (3). In the process of setting the prestress, one end of the prestressed steel bars (3) is fixed to one end of the integral culvert or the straight wall through a pressure plate (4), and then the other end of the prestressed steel bars is pulled at the other end of the integral culvert or the straight wall, so that prestress is generated inside the prestressed steel bars. The other end of the prestressed steel bars is close to the outer surface of the culvert body pipe section and the outer surface of the straight wall, and a steel clip (5) is provided to prevent the prestressed steel bars from shrinking.

4. The prefabricated assembled square culvert with joists according to claim 1, characterized in that: The culvert body tube section (2) is divided into six sections.

5. The prefabricated assembled square culvert with joists according to claim 1, characterized in that: There are eight prestressed steel bars, four of which (3) are arranged at four corners of the square tube section of the culvert body pipe section (2), and the remaining four prestressed steel bars (13) are arranged on both sides of the two straight walls (1).

6. The prefabricated assembled square culvert with joists according to claim 1, characterized in that: The sockets between the culvert pipe sections (2), the sockets between the upper crossbeam (1-1) and the middle retaining wall (1-2), and the sockets between the middle retaining wall (1-2) and the lower beam (1-3) are all formed by matching the outer square cone and the inner square cone with the same taper.

7. The prefabricated assembled square culvert with joists according to claim 1, characterized in that: The support beam (6) is made of concrete and is provided with (11) prestressed reinforcement bars inside.

8. The prefabricated assembled square culvert according to any one of claims 1 to 7, characterized in that: A plurality of connection chambers (7) are arranged on the outer surface of the culvert body pipe section (2) adjacent to the pipe opening. The connection chambers (7) are recessed into the hole wall of the culvert body pipe section (2) and form external bolt seats by their side surfaces. The connection chambers (7) on two adjacent culvert body pipe sections (2) correspond to each other and the external bolt seats are fixed as a whole by high-strength bolts (9). The strength of each external bolt seat is enhanced by a pre-buried steel bar structure.

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