Lightweight prefabricated roadbed and construction method

Abstract

The present invention discloses a lightweight prefabricated track bed, comprising two prefabricated longitudinal sleepers, the two prefabricated longitudinal sleepers being longitudinally spaced apart, a pressure platform being provided on the top of the prefabricated longitudinal sleeper, a rail being mounted on the pressure platform via fasteners, a first layer of connecting steel mesh being pre-embedded in the bottom of the prefabricated longitudinal sleeper, the two first layers of connecting steel mesh being connected via a transversely distributed second layer of connecting steel mesh, a plurality of transverse through holes being transversely opened on the prefabricated longitudinal sleeper, a third layer of connecting steel mesh being mounted in two corresponding transverse through holes, concrete being poured into the gap between the two prefabricated longitudinal sleepers to form a base layer, the base layer being covered with the first layer of connecting steel mesh, the second layer of connecting steel mesh, and the third layer of connecting steel mesh. A construction method for the lightweight prefabricated track bed is also disclosed. The present invention has the beneficial effects of enabling the overall installation of the lightweight prefabricated track bed, and facilitating the installation of the prefabricated longitudinal sleepers via a supporting frame during the installation process.

Description

Technical Field

[0001] The invention relates to a longitudinal prefabricated integral roadbed, in particular to a lightweight prefabricated roadbed and a construction method. Background Art

[0002] As a vital component of the urban rail transit track structure, the roadbed bears direct loads from rail transit trains and evenly transfers these loads to the track segments beneath it. The construction quality of the roadbed is crucial. Traditionally, the entire roadbed is cast on-site, and the construction quality is often difficult to control. Precast track slabs are prefabricated in the factory and assembled on-site, which effectively controls the quality of the roadbed. However, due to their single size and fixed width, single precast track slabs cannot adapt to large shield deviations. In addition, existing precast roadbeds have a high degree of freedom and can slide freely in the longitudinal, transverse, and forward directions, thus affecting the stability of the roadbed.

[0003] After a long period of research, the inventor invented the longitudinal prefabricated integral roadbed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a lightweight prefabricated roadbed and a construction method.

[0005] The objectives of the present invention are achieved through the following technical solutions: a lightweight prefabricated track bed, comprising prefabricated longitudinal sleepers, two prefabricated longitudinal sleepers, and the two prefabricated longitudinal sleepers are longitudinally symmetrically distributed, a pressure platform is provided on the top of the prefabricated longitudinal sleeper, a rail is installed on the pressure platform through fasteners, a first layer of connecting steel mesh is embedded in the bottom of the prefabricated longitudinal sleeper, the two first layers of connecting steel meshes are connected by a transversely distributed second layer of connecting steel mesh, a plurality of transverse through holes are transversely opened on the prefabricated longitudinal sleeper, a third layer of connecting steel mesh is installed in two corresponding transverse through holes, concrete is poured in the gap between the two prefabricated longitudinal sleepers to form a base layer, and the base layer covers the first layer of connecting steel mesh, the second layer of connecting steel mesh and the third layer of connecting steel mesh.

[0006] Optionally, the first layer of connecting steel mesh includes a plurality of connecting stirrups and a plurality of first connecting longitudinal bars, the plurality of connecting stirrups are pre-embedded in the prefabricated longitudinal sleepers at intervals, and the plurality of connecting stirrups are connected by a plurality of longitudinally distributed first connecting longitudinal bars.

[0007] Optionally, the second layer of connecting steel mesh includes a plurality of transverse steel bars and a plurality of second connecting longitudinal bars, the plurality of transverse steel bars are installed on the first connecting longitudinal bars at intervals across the plurality of transverse steel bars, and the plurality of transverse steel bars are connected by the plurality of second connecting longitudinal bars.

[0008] Optionally, there are multiple pressure-bearing platforms, and the multiple pressure-bearing platforms are distributed at intervals in the longitudinal direction, and concrete vibration holes are opened on the prefabricated longitudinal sleepers between adjacent pressure-bearing platforms.

[0009] Optionally, a drainage ditch base is also cast on the outer side of the prefabricated longitudinal sleeper, and the channel between the drainage ditch base, the tunnel inner wall and the prefabricated longitudinal sleeper forms a drainage ditch.

[0010] Optionally, a sleeve for installing a supporting frame is embedded in the prefabricated longitudinal sleeper.

[0011] Optionally, the supporting frame includes a transverse connecting rod, each end of which is connected to a connecting piece, which is installed on the sleeper through a locking assembly, and the connecting piece is also provided with at least one rail bottom pressure block for controlling the slope of the rail, and the connecting piece is also provided with a height adjustment connecting block, the rail bottom pressure block is located between the height adjustment connecting block and the transverse connecting rod, and a height adjustment screw is threadedly installed on the height adjustment connecting block, and the bottom of the height adjustment screw passes through the connecting piece.

[0012] Optionally, the height adjustment connecting block includes a base, which is detachably connected to the connecting piece. A sleeve is provided on the base, and a threaded hole is provided on the sleeve to cooperate with the thread of the height adjustment screw. A through hole is provided at the bottom of the connecting piece for the height adjustment screw to pass through.

[0013] Optionally, a support member is installed on one end of the connecting member near the transverse connecting rod, and the transverse connecting rod is fixedly installed on the support member. The connecting member has a rectangular structure, and locking assemblies are installed on the four corners of the connecting member. The locking assembly includes a locking bolt and a slide block. Waist-shaped holes are opened on the four corners of the connecting member. The locking bolts pass through the slide block and the waist-shaped hole in sequence and are connected to the sleeper.

[0014] The construction method of the lightweight prefabricated roadbed includes the following steps:

[0015] S1: Assemble the prefabricated longitudinal sleepers. Lay multiple prefabricated longitudinal sleepers flat, install the rails on the longitudinal sleepers with fasteners, preliminarily adjust the distance between the left and right rails, and then install the support frame on the prefabricated longitudinal sleepers to form a longitudinal sleeper group. Next, place the transverse reinforcement on the first connecting longitudinal reinforcement, and then place the second connecting longitudinal reinforcement on the transverse reinforcement. Tie the transverse reinforcement and the second connecting longitudinal reinforcement to form a second layer of connecting reinforcement mesh. Then, pass the third layer of connecting reinforcement mesh across the corresponding transverse through holes. Thus, the longitudinal sleepers are connected in series using the rails, support frame, first layer connecting reinforcement mesh, second layer connecting reinforcement mesh, and third layer connecting reinforcement mesh to form a rail row.

[0016] S2: Prefabricated longitudinal sleeper installation: Place the rails in the tunnel, then use the gauge adjustment auxiliary tool to adjust the distance between the two prefabricated longitudinal sleepers, and then use the support frame to adjust the horizontal height of the prefabricated longitudinal sleepers to ensure that the distance between the two prefabricated longitudinal sleepers is in the same plane;

[0017] S3: Concrete pouring, installing formwork on the outside of the prefabricated longitudinal sleepers, and then pouring concrete to form the base layer;

[0018] S4: Make drainage ditch, remove formwork and supporting frame, and pour concrete on the outside of prefabricated longitudinal sleepers to form the drainage ditch base.

[0019] The present invention has the following advantages: the lightweight prefabricated roadbed of the present invention realizes the assembly of prefabricated longitudinal sleepers through the first layer of connecting steel mesh, the second layer of connecting steel mesh, the third layer of connecting steel mesh and the supporting frame, and ensures the stability of the track row. During installation, the overall installation is achieved, and the gauge and horizontality of the prefabricated longitudinal sleepers can be guaranteed, so the installation accuracy is high. During the installation process, the prefabricated longitudinal sleepers are easily installed through the supporting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of the present invention

[0021] Figure 2 Schematic diagram of the track structure Figure 1

[0022] Figure 3 Schematic diagram of the track structure Figure 2

[0023] Figure 4 Installation diagram of the second and third layer connecting steel mesh

[0024] Figure 5 Installation diagram of the first layer connecting steel mesh

[0025] Figure 6 Installation diagram for supporting the large frame

[0026] Figure 7 A schematic diagram of the structure supporting the large frame;

[0027] Figure 8 for Figure 7 Schematic cross-sectional view of AA in the figure;

[0028] Figure 9 is a structural diagram of the connecting piece;

[0029] Figure 10 Schematic diagram of the structure for raising the connection block Figure 1 ;

[0030] Figure 11 Schematic diagram of the structure for raising the connection block Figure 2 ;

[0031] Figure 12 is a structural diagram of a support member;

[0032] Figure 13 It is a structural diagram of the height adjustment screw;

[0033] In the figure, 101-tunnel, 102-base layer, 103-drainage ditch, 104-prefabricated longitudinal sleeper, 106-pressure platform, 107-rail, 108-concrete vibration hole, 109-cylinder sleeve, 110-drainage ditch base, 111-first layer connecting steel mesh, 112-second layer connecting steel mesh, 113-third layer connecting steel mesh, 114-transverse through hole, 115-connecting stirrups, 116-first connecting longitudinal reinforcement, 117-support frame, 1-transverse connecting rod, 2-connecting piece, 3-supporting piece, 4-rail bottom pressure block, 5-heightening connecting block, 6-heightening screw, 7-slider block, 21-waist-shaped hole, 22-through hole, 51-sleeve, 52-rib plate, 53-threaded hole, 54-base, 61-through hole. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] Example 1:

[0041] like Figure 1 、 Figure 2 and Figure 3 As shown, the lightweight prefabricated track bed includes prefabricated longitudinal sleepers 104. There are two prefabricated longitudinal sleepers 104, and the two prefabricated longitudinal sleepers 104 are longitudinally symmetrically distributed. A pressure platform 106 is provided on the top of the prefabricated longitudinal sleeper 104, and a rail 107 is installed on the pressure platform 106 through fasteners. The pressure platform 106 has an inclined surface and a connecting hole is opened on the pressure platform 106. The rail 107 is installed on the pressure platform 106 through fasteners.

[0042] In this embodiment, if Figure 4 and Figure 5As shown, a first layer of connecting steel mesh 111 is embedded in the bottom of the prefabricated longitudinal sleeper 104, and the two first layers of connecting steel mesh 111 are connected by a transversely distributed second layer of connecting steel mesh 112. A plurality of transverse through holes 114 are opened transversely on the prefabricated longitudinal sleeper 104, and a third layer of connecting steel mesh 113 is installed in two corresponding transverse through holes 114. Concrete is poured in the gap between the two prefabricated longitudinal sleepers 104 to form a base layer 102, which covers the first layer of connecting steel mesh 111, the second layer of connecting steel mesh 112, and the third layer of connecting steel mesh 113. The steel mesh 112 and the third layer connecting steel mesh 113, further, the first layer connecting steel mesh 111 includes a plurality of connecting stirrups 115 and a plurality of first connecting longitudinal bars 116, the plurality of connecting stirrups 115 are pre-buried in the prefabricated longitudinal sleepers 104 at intervals, and the plurality of connecting stirrups 115 are connected by a plurality of longitudinally distributed first connecting longitudinal bars 116, the first layer connecting steel mesh 111 can enhance the connection and anchoring ability between the prefabricated longitudinal sleepers 104 and the base layer 102, and is the supporting skeleton of the second layer connecting steel mesh 112.

[0043] In this embodiment, the second layer of connecting steel mesh 112 includes a number of transverse steel bars and a number of second connecting longitudinal bars. The number of transverse steel bars are installed on the first connecting longitudinal bars 116 at intervals, and the number of transverse steel bars are connected by a number of second connecting longitudinal bars. During construction, the left and right multiple prefabricated longitudinal sleepers 104 are first laid flat, and then the transverse steel bars are placed on the first connecting longitudinal bars 116, and then the second connecting longitudinal bars are placed on the transverse steel bars, and then the transverse steel bars and the second connecting longitudinal bars are tied together.

[0044] In this embodiment, there are multiple pressure platforms 106, and the multiple pressure platforms 106 are distributed at intervals in the longitudinal direction. Concrete vibration holes 108 are opened on the prefabricated longitudinal sleepers 104 between adjacent pressure platforms 106. Preferably, the cross-section of the concrete vibration holes 108 is a trapezoidal structure. When the base layer 102 is poured, a vibrating rod can be placed in the concrete vibration hole 108 for vibration, thereby ensuring the pouring quality of the concrete, and at the same time further ensuring the stability of the prefabricated longitudinal sleepers 104 and the base layer 102.

[0045] In this embodiment, a drainage ditch base 110 is also cast on the outer side of the prefabricated longitudinal sleeper 104. The channel between the drainage ditch base 110, the inner wall of the tunnel 101 and the prefabricated longitudinal sleeper 104 forms a drainage ditch 103. The water in the tunnel 101 can be drained along the drainage ditch 103. Preferably, the drainage ditch 103 has a certain slope, and the slope is 2°, so as to facilitate the drainage of water.

[0046] In this embodiment, if Figure 6As shown, a sleeve 109 for installing a supporting frame 117 is pre-embedded on the prefabricated longitudinal sleeper 104. The prefabricated longitudinal sleeper 104, the rail 107, the supporting frame 117, the first layer of connecting steel mesh 111, the second layer of connecting steel mesh 112 and the third layer of connecting steel mesh 113 form a track row.

[0047] In this embodiment, if Figure 7 and Figure 8 As shown, the support frame 117 includes a transverse connecting rod 1, and both ends of the transverse connecting rod 1 are connected to a connecting piece 2. The connecting piece 2 is installed on the sleeper through a locking assembly. The connecting piece 2 is also provided with at least one rail bottom pressure block 4 for controlling the slope of the rail. The connecting piece 2 is also provided with a height adjustment connecting block 5. The rail bottom pressure block 4 is located between the height adjustment connecting block 5 and the transverse connecting rod 1. A height adjustment screw 6 is threadedly installed on the height adjustment connecting block 5, and the bottom of the height adjustment screw 6 passes through the connecting piece 2. When in use, the support frame 117 is passed from under the rail so that the rail is located on the rail bottom pressure block 4. Furthermore, the rail bottom pressure block 4 is divided into two pieces, and the two rail bottom pressure blocks 4 are arranged side by side in the longitudinal direction. The rail bottom pressure block 4 is provided with an inclined piece inclined to the transverse connecting rod 1. The surface, therefore, the rail bottom slope can be controlled by the rail bottom pressure block 4, and then the gauge adjustment auxiliary tooling is used to adjust the spacing between the two rails. The gauge adjustment auxiliary tooling belongs to the existing technology, so it is not described in detail. While adjusting the spacing between the two rails, the rails will slide along the rail bottom pressure block 4, so that the horizontal height of the rails will change. When the spacing between the rails is adjusted, at this time, the height adjustment screw 6 is rotated, and the bottom of the height adjustment screw 6 is against a hard object. However, when the height adjustment screw 6 is rotated, the height adjustment screw 6 does not move axially. At this time, the height adjustment connecting block 5 corresponding to the height adjustment screw 6 will move axially, thereby driving the connecting piece 2 to move up and down, thereby realizing the height adjustment of the rail on the rail bottom pressure block 4 and ensuring the installation accuracy of the rail.

[0048] In this embodiment, if Figure 9 and Figure 12 As shown, a support member 3 is installed on the end of the connecting member 2 close to the transverse link 1, and the transverse link 1 is fixedly installed on the support member 3. Preferably, the transverse link 1 is welded to the support member 3, and a plurality of connecting holes are opened on the support member 3, and the support member 3 and the connecting member 2 are connected by bolts installed in the connecting holes. Preferably, the support member 3 is cross-shaped, and the end close to the transverse link 1 is welded to the transverse link 1, and the ends in the other three directions are connected to the connecting member 2 by bolts, and holes for connecting with the bolts are opened on the connecting member 2.

[0049] In this embodiment, if Figure 9As shown, the connecting member 2 is a rectangular structure, and locking components are installed on the four corners of the connecting member 2. The locking components include locking bolts and slide blocks 7. Waist-shaped holes 21 are opened on the four corners of the connecting member 2. The locking bolts pass through the slide blocks 7 and the waist-shaped holes 21 in sequence and are connected to the sleepers. The waist-shaped holes 21 are provided, so the slide blocks 7 and the locking bolts can move relative to the connecting member 2. Therefore, the slide blocks 7 can slide laterally under the drive of the sleepers, which can be used to adjust the track gauge.

[0050] In this embodiment, if Figure 10 and Figure 11 As shown, the height-adjusting connecting block 5 includes a base 54, which is detachably connected to the connecting member 2. A sleeve 51 is provided on the base 54, and a threaded hole 53 is provided on the sleeve 51 for threaded cooperation with the height-adjusting screw 6. A through hole 22 for the height-adjusting screw 6 is provided at the bottom of the connecting member 2. To ensure the stability of the connection of the sleeve 51, a rib 52 is connected to the side wall of the sleeve 51, and the rib 52 is fixedly mounted on the base 54. Furthermore, a plurality of connecting holes are provided on the base 54, and the base 54 and the connecting member 2 are connected by bolts installed in the connecting holes. Preferably, three connecting holes are provided on the base 54, and the three connecting holes are distributed in a triangular shape.

[0051] In this embodiment, if Figure 13 As shown, the height of the rail can be adjusted by rotating the height-adjusting screw 6. In order to facilitate the rotation of the height-adjusting screw 6, a through-hole 61 is radially opened at the top of the height-adjusting screw 6. When the height-adjusting screw 6 is difficult to rotate, a core rod can be inserted into the through-hole 61, and then the height-adjusting screw 6 can be rotated by rotating the core rod.

[0052] Example 2:

[0053] The construction method of the lightweight prefabricated roadbed includes the following steps:

[0054] S1: Assembling prefabricated longitudinal sleepers, placing multiple prefabricated longitudinal sleepers 104 horizontally, installing rails 107 on the prefabricated longitudinal sleepers 104 through fasteners, preliminarily adjusting the distance between the left and right rails 107, and then installing the supporting frame 117 on the prefabricated longitudinal sleepers 104 to form a longitudinal sleeper group; secondly, placing the transverse steel bars on the first connecting longitudinal bars 116, and then placing the second connecting longitudinal bars on the transverse steel bars, binding the transverse steel bars and the second connecting longitudinal bars to form a second layer of connecting steel mesh 112, and then passing the third layer of connecting steel mesh 113 across the corresponding transverse through holes 114, and then installing the rails 107 and the supporting frame 117 on the prefabricated longitudinal sleepers 104, so as to connect the prefabricated longitudinal sleepers 104 in series by using the rails 107, the supporting frame 117, the first layer of connecting steel mesh 111, the second layer of connecting steel mesh 112 and the third layer of connecting steel mesh 113 to form a rail row;

[0055] S2: Prefabricated longitudinal sleepers 104 are installed. The rail row is placed in the tunnel 101. The distance between the two prefabricated longitudinal sleepers 104 is adjusted using the gauge adjustment auxiliary tool. The horizontal height of the prefabricated longitudinal sleepers 104 is then adjusted using the support frame 117 to ensure that the distance between the two prefabricated longitudinal sleepers 104 is in the same plane.

[0056] S3: concrete pouring, installing a formwork on the outer side of the prefabricated longitudinal sleeper 104, and then pouring concrete to form a base layer;

[0057] S4: Make a drainage ditch, remove the formwork and supporting frame, and pour concrete on the outer side of the prefabricated longitudinal sleeper 104 to form the drainage ditch base.

[0058] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The construction method of lightweight prefabricated roadbed is characterized by: A lightweight prefabricated roadbed comprises a prefabricated longitudinal sleeper, wherein the number of the prefabricated longitudinal sleepers is two, and the two prefabricated longitudinal sleepers are longitudinally symmetrically distributed. A pressure platform is provided on the top of the prefabricated longitudinal sleeper, and a rail is installed on the pressure platform via a fastener. A first layer of connecting steel mesh is embedded in the bottom of the prefabricated longitudinal sleeper, and the two first layers of connecting steel mesh are connected by a transversely distributed second layer of connecting steel mesh. A plurality of transverse through holes are transversely opened on the prefabricated longitudinal sleeper, and a third layer of connecting steel mesh is installed in two corresponding transverse through holes. Concrete is poured in the gap between the two prefabricated longitudinal sleepers to form a base layer, and the base layer covers the first layer of connecting steel mesh, the second layer of connecting steel mesh, and the third layer of connecting steel mesh. The construction method of the prefabricated longitudinal sleeper comprises the following steps: S1: Assembling prefabricated longitudinal sleepers, laying multiple prefabricated longitudinal sleepers flat, installing rails on the longitudinal sleepers through fasteners, preliminarily adjusting the distance between the left and right rails, and then installing a supporting frame on the prefabricated longitudinal sleepers to form a longitudinal sleeper group; secondly, placing transverse steel bars on the first connecting longitudinal bars, and then placing the second connecting longitudinal bars on the transverse steel bars, binding the transverse steel bars and the second connecting longitudinal bars to form a second layer of connecting steel mesh, and then passing the third layer of connecting steel mesh across the corresponding transverse through holes, thereby connecting the longitudinal sleepers in series using the rails, the supporting frame, the first layer of connecting steel mesh, the second layer of connecting steel mesh, and the third layer of connecting steel mesh to form a rail row; S2: Prefabricated longitudinal sleeper installation: Place the rails in the tunnel, then use the gauge adjustment auxiliary tool to adjust the distance between the two prefabricated longitudinal sleepers, and then use the support frame to adjust the horizontal height of the prefabricated longitudinal sleepers to ensure that the distance between the two prefabricated longitudinal sleepers is in the same plane; S3: Concrete pouring, installing formwork on the outside of the prefabricated longitudinal sleepers, and then pouring concrete to form the base layer; S4: Make drainage ditch, remove formwork and supporting frame, and pour concrete on the outside of prefabricated longitudinal sleepers to form the drainage ditch base; The supporting frame includes a transverse connecting rod, each end of which is connected to a connecting piece, the connecting piece is mounted on the sleeper through a locking assembly, the connecting piece is further provided with at least one rail bottom pressure block for controlling the slope of the rail, the connecting piece is further provided with a height adjustment connecting block, the rail bottom pressure block is located between the height adjustment connecting block and the transverse connecting rod, a height adjustment screw is threadedly mounted on the height adjustment connecting block, and the bottom of the height adjustment screw passes through the connecting piece; The height adjustment connecting block includes a base, which is detachably connected to the connecting piece. A sleeve is provided on the base, and a threaded hole is provided on the sleeve to cooperate with the thread of the height adjustment screw. A through hole is provided at the bottom of the connecting piece for the height adjustment screw to pass through. A support member is installed on one end of the connecting member close to the transverse connecting rod, and the transverse connecting rod is fixedly installed on the support member. The connecting member has a rectangular structure, and the locking assembly is installed on the four corners of the connecting member. The locking assembly includes a locking bolt and a slide block. Waist-shaped holes are opened on the four corners of the connecting member. The locking bolts pass through the slide block and the waist-shaped hole in sequence and are connected to the sleeper.

2. The lightweight prefabricated roadbed according to claim 1 is characterized in that: The first layer of connecting steel mesh includes a plurality of connecting stirrups and a plurality of first connecting longitudinal bars. The plurality of connecting stirrups are pre-embedded in the prefabricated longitudinal sleepers at intervals, and the plurality of connecting stirrups are connected by a plurality of longitudinally distributed first connecting longitudinal bars.

3. The lightweight prefabricated roadbed according to claim 2 is characterized in that: The second layer of connecting steel mesh includes a plurality of transverse steel bars and a plurality of second connecting longitudinal bars. The plurality of transverse steel bars are installed on the first connecting longitudinal bars at intervals across the plurality of transverse steel bars, and the plurality of transverse steel bars are connected by the plurality of second connecting longitudinal bars.

4. The lightweight prefabricated roadbed according to claim 3 is characterized in that: There are multiple pressure bearing platforms, and the multiple pressure bearing platforms are distributed at intervals in the longitudinal direction. Concrete vibration holes are opened on the prefabricated longitudinal sleepers between adjacent pressure bearing platforms.

5. The lightweight prefabricated roadbed according to claim 4 is characterized in that: A drainage ditch base is also cast on the outer side of the prefabricated longitudinal sleeper, and a channel between the drainage ditch base, the inner wall of the tunnel and the prefabricated longitudinal sleeper forms a drainage ditch.

6. The lightweight prefabricated roadbed according to claim 5, characterized in that: A sleeve for installing a supporting frame is pre-embedded on the prefabricated longitudinal sleeper.

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