Construction method for preventing differential settlement at junction of new and old cement stabilized base layers

Abstract

The invention discloses a construction method for preventing differential settlement at the junction of new and old cement stabilized bases, and relates to the technical field of municipal engineering road construction.The construction method comprises a supporting assembly and a connecting assembly.The supporting assembly comprises a supporting plate, a shell, a supporting rod, a lead screw, a connecting plate, a worm gear, a worm, a hand wheel and a base; a connecting plate is fixedly connected to the inner side wall of the supporting plate, a supporting rod is rotationally connected to one side of the connecting plate, a shell is installed on the surface of the supporting rod, a lead screw is arranged on the inner wall of the supporting rod, a worm wheel is arranged on the surface of the lead screw, a worm is meshed with one side of the worm wheel, and a hand wheel is fixedly connected to one side of the worm. The bottom end of the shell is fixedly connected with a base; the connecting assembly comprises a connecting block, a reinforcing rib and a threaded rod, the connecting block is installed on one side of the supporting plate, and the threaded rod is rotationally connected to the inner wall of the connecting block, so that the technical problem that the supporting structure is unstable due to differential settlement at the junction of the new and old water stabilizing base layers is solved.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering road construction technology, specifically a construction method for preventing differential settlement at the junction of new and old water-stabilized base courses. Background Technology

[0002] Municipal engineering road construction refers to all civil engineering activities within the red line area of ​​the urban planning zone, in accordance with municipal public works standards, including new construction, reconstruction, expansion, maintenance, and major and medium repairs of motor vehicle lanes, non-motor vehicle lanes, sidewalks, and their ancillary facilities (subgrade, base layer, surface layer, drainage, lighting, traffic engineering, greening, etc.). Cement-stabilized crushed stone base course, abbreviated as "water-stabilized layer", is the load-bearing layer in the road structure. When the road is widened, partially excavated or constructed in sections, the existing old water-stabilized layer and the newly laid water-stabilized layer will form a splicing joint in the longitudinal or transverse direction. The compaction degree, age, and subgrade strength of the new and old parts are often different. After the road is opened to traffic, the new base course continues to consolidate and compress, while the old base course has already stabilized. As a result, a relative settlement with "one higher and one lower" will appear on both sides of the joint - this is differential settlement.

[0003] However, existing construction methods for preventing differential settlement at the interface between new and old water-stabilized base courses have the following drawbacks:

[0004] (1) Existing construction methods for preventing differential settlement at the junction of new and old water-stabilized base courses have weak support function. Existing technologies generally use steel cages to support the base course when partially excavating and patching the road. However, the assembly of the steel cages is quite complicated, resulting in low construction efficiency.

[0005] (2) The existing construction methods for preventing differential settlement at the junction of new and old water-stabilized base courses have weak connection and fixing functions. When the existing steel cage or support structure is installed inside the base course, it may cause the steel cage or support structure to shake when asphalt is poured in, resulting in unstable internal support and uneven pressure distribution. Summary of the Invention

[0006] The purpose of this invention is to provide a construction method for preventing differential settlement at the junction of new and old water-stabilized base courses, so as to solve the technical problem of unstable support structure caused by differential settlement at the junction of new and old water-stabilized base courses.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a construction method for preventing differential settlement at the junction of new and old water-stabilized base courses, comprising a support assembly and a connecting assembly. The support assembly includes a support plate, a shell, a support rod, a lead screw, a connecting plate, a worm gear, a worm, a handwheel, and a base. The inner side wall of the support plate is fixedly connected to the connecting plate, and the support rod is rotatably connected to one side of the connecting plate. The shell is mounted on the surface of the support rod. The inner wall of the support rod is provided with a lead screw, and the surface of the lead screw is provided with a worm gear. The worm gear meshes with a worm on one side, and a handwheel is fixedly connected to one side of the worm. The base is fixedly connected to the bottom end of the shell.

[0008] The connecting assembly includes a connecting block, a reinforcing rib, and a threaded rod. The connecting block is installed on one side of the support plate, and the threaded rod is rotatably connected to the inner wall of the connecting block.

[0009] Optionally, the inner wall of the support plate is equipped with reinforcing ribs on the upper and lower surfaces of the connecting pipe. The reinforcing ribs are symmetrically distributed, and the vertical installation of the reinforcing ribs can improve the strength of the connecting pipe installation.

[0010] Optionally, a connecting pipe is installed on the other side of the support plate. The connecting pipes are arranged at equal intervals and steel bars can be inserted into the connecting pipes. The support plate is symmetrically installed inside the foundation pit. The symmetrical placement of the connecting pipes can strengthen the support strength in the middle of the foundation pit by inserting steel bars into the connecting pipes.

[0011] Optionally, there are five connecting blocks, which are arranged at equal intervals. The equal-interval arrangement of the connecting blocks can connect multiple threaded rods.

[0012] Optionally, a circular groove is provided on one side of the housing, the circular groove being located on the surface of the worm gear, and the circular groove is used to limit the movement of the worm gear surface.

[0013] Optionally, the inner bottom wall of the support plate is provided with a square groove, which is located on the surface of the base and is used to limit the position of the base.

[0014] A circular groove is provided on one side of the housing, and the worm gear passes through the circular groove;

[0015] A constraint plate is provided inside the housing, which constrains the position of the worm gear inside the housing.

[0016] An internal thread is provided inside the worm gear, and the worm gear is threadedly connected to the lead screw.

[0017] In a further technical solution, a square groove is formed on the inner bottom wall of the support plate, and the square groove is located above the base; the size of the square groove is smaller than the size of the base.

[0018] In a further technical solution, an installation hole is opened in the support rod, and a fixing plate is installed in the installation hole. The fixing plate is connected to the lead screw through a connecting bearing.

[0019] An extended ring is provided at the bottom of the support rod, and a constricting cylinder is provided on the housing. The diameter of the extended ring is smaller than the diameter of the constricting cylinder.

[0020] In a further technical solution, the vertical cross-section of the shell is rectangular; the vertical cross-section of the support assembly is trapezoidal.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This construction method for preventing differential settlement at the junction of new and old water-stabilized base courses utilizes a support assembly. During use, a handwheel is turned clockwise to rotate a worm gear. The worm gear meshes with a worm wheel, driving a lead screw upwards as the wheel rotates. The lead screw pushes the support rod upwards, and the upward movement of the support rod is controlled by a housing limiter. A connecting plate pushes the support plate against the edge of the pit opening, ensuring proper curing of the internal asphalt and connection with the surrounding old base course. Because one side of the support plate is sloped, it effectively creates diagonal pressure, concentrating pressure evenly in the center to prevent downward settlement at the center and edges after asphalt curing under external pressure. The base fits against the bottom of the base course to stabilize the device and prevent slippage, thus improving its stability.

[0023] 2. This construction method for preventing differential settlement at the junction of old and new water-stabilized base courses, through the setting of connecting components, allows the threaded rod to be rotated by an electric device to connect the connecting block to the inner wall of the base course. This can stably fix the support plate to the inner wall of the base course, improving the stability of the fit between this part and the inner wall of the base course. Furthermore, the installation of reinforcing ribs can reduce the impact of external shear forces on the connecting block when the support plate is fixed to asphalt or when it is supported by external pressure impact, thereby improving the overall strength of this part.

[0024] 3. This invention uses a constraint plate to limit the vertical position of the worm gear, and the worm is height-limited by the housing. A constricting sleeve and an extended ring are used to prevent the support rod from detaching from the housing. The worm gear is threadedly connected to the lead screw. When the worm drives the worm gear to rotate, because the worm gear is vertically limited, it can only drive the lead screw to rotate. The rotation of the lead screw causes it to move up and down relative to the worm gear. The top of the lead screw is connected to a fixed plate via a bearing, thus achieving the raising and lowering of the support rod through the rotation of the lead screw. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall appearance of Embodiment 1 of the present invention;

[0026] Figure 2This is a schematic cross-sectional view of the support plate in Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram showing the disassembled connection components of the present invention;

[0028] Figure 4 for Figure 2 A magnified view showing the details at point A;

[0029] Figure 5 for Figure 2 BB cross-section diagram;

[0030] Figure 6 This is a schematic cross-sectional view of the support plate in Embodiment 2 of the present invention;

[0031] Figure 7 for Figure 6 Enlarged view of point C.

[0032] In the diagram: 1. Support assembly; 101. Support plate; 102. Housing; 103. Support rod; 104. Lead screw; 105. Connecting plate; 106. Worm gear; 107. Worm; 108. Handwheel; 109. Base; 110. Square groove; 111. Fixing plate; 112. Connecting bearing; 113. Outer ring; 114. Closure section; 2. Connecting assembly; 201. Connecting block; 202. Reinforcing rib; 203. Threaded rod; 3. Connecting pipe. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] Please see Figures 1-4 As shown, the technical solution provided by the present invention is a construction method for preventing differential settlement at the junction of new and old water-stabilized base courses, including a support assembly 1 and a connecting assembly 2. The support assembly 1 is composed of a support plate 101, a shell 102, a support rod 103, a lead screw 104, a connecting plate 105, a worm gear 106, a worm 107, a handwheel 108, and a base 109. The connecting plate 105 is fixedly connected to the inner side wall of the support plate 101, and the support rod 103 is rotatably connected to one side of the connecting plate 105. The shell 102 is installed on the surface of the support rod 103. The lead screw 104 is provided on the inner wall of the support rod 103, and the worm gear 106 is provided on the surface of the lead screw 104. The worm gear 107 is meshed on one side of the worm gear 106, and the handwheel 108 is fixedly connected to one side of the worm 107.

[0036] A base 109 is fixedly connected to the bottom end of the housing 102. By holding the handwheel 108 and rotating it clockwise, the worm gear 107 can be rotated. Figure 5 As shown, the worm gear 107 meshes with the worm wheel 106, which drives the lead screw 104 to move upward when the worm wheel 106 rotates. The lead screw 104 pushes the support rod 103 upward. The upward movement of the support rod 103 is limited by the housing 102 and can be pushed upward by the connecting plate 105. The support plate 101 is attached to the edge of the pit opening to ensure that the internal asphalt can be cured and connected with the surrounding old base layer. Since one side of the support plate 101 is inclined, it can form a good diagonal pressure. The inclined surface can evenly concentrate the pressure in the middle, preventing the middle and edge from sinking downward when subjected to external pressure after the asphalt is cured. The base 109 can be attached to the bottom of the base layer to stabilize the part and prevent slippage, thereby improving the stability of the construction method.

[0037] The connecting component 2 includes a connecting block 201, a reinforcing rib 202, and a threaded rod 203. The connecting block 201 is installed on one side of the support plate 101, and the threaded rod 203 is rotatably connected to the inner wall of the connecting block 201. The threaded rod 203 can be rotated by an electric device to pass through the connecting block 201 and connect to the inner wall of the base layer. This can stably fix the support plate 101 to the inner wall of the base layer, improving the stability of the fit between this part and the inner wall of the base layer. Furthermore, the installation of the reinforcing rib 202 can reduce the impact of external shear force on the connecting block 201 when the support plate 101 is fixed to asphalt or when it is supported by external pressure impact, thus improving the overall integrity of this construction method.

[0038] The inner wall of the support plate 101 is equipped with reinforcing ribs 202 on the upper and lower surfaces of the connecting pipe 3. The reinforcing ribs 202 are symmetrically distributed, and the vertical installation of the reinforcing ribs 202 can improve the strength of the connecting pipe 3.

[0039] A connecting pipe 3 is installed on the other side of the support plate 101. The connecting pipes 3 are arranged at equal intervals. Reinforcing bars can be inserted into the connecting pipes 3. The support plate 101 is symmetrically installed inside the foundation pit. The symmetrical placement of the connecting pipes 3 allows the reinforcing bars to be inserted into the connecting pipes 3 to strengthen the support strength in the middle of the foundation pit.

[0040] There are five connecting pipes 3, and the connecting blocks 201 are arranged at equal intervals. The equidistant arrangement of the connecting blocks 201 can connect multiple threaded rods 203.

[0041] A circular groove is provided on one side of the housing 102, and the circular groove is located on the surface of the worm gear 107. The circular groove is used to limit the surface of the worm gear 107. The vertical cross-section of the housing 102 is rectangular. The vertical cross-section of the support assembly 1 is trapezoidal.

[0042] like Figure 1The support plate 101 has a square groove 110 on its inner bottom wall, which is located above the base 109; the size of the square groove 110 is smaller than the size of the base 109.

[0043] The construction method of this invention comprises the following steps:

[0044] Step 1: By holding the handwheel 108 and turning it clockwise, the worm gear 107 can be rotated. The worm gear 107 meshes with the worm wheel 106, which drives the lead screw 104 to move upward when the worm wheel 106 rotates. The lead screw 104 pushes the support rod 103 upward. The upward movement of the support rod 103 is limited by the housing 102 and can be pushed upward by the connecting plate 105. The support plate 101 is attached to the edge of the pit opening to ensure that the internal asphalt can be cured and connected with the surrounding old base layer. Since one side of the support plate 101 is inclined, it can form a good diagonal pressure. The inclined surface can evenly concentrate the pressure in the middle, preventing the middle and edge from sinking downward when subjected to external pressure after the asphalt is cured. The base 109 can be attached to the bottom of the base layer to stabilize the part and prevent slippage, thereby improving the stability of the component.

[0045] Step 2: The threaded rod 203 can be rotated by the electric equipment to connect the connecting block 201 to the inner wall of the base layer. This can stably fix the support plate 101 to the inner wall of the base layer, improving the stability of the device's fit with the inner wall of the base layer. Furthermore, the installation of the reinforcing rib 202 can reduce the impact of external shear force on the connecting block 201 when the support plate 101 is fixed to the asphalt or when it is supported by external pressure impact, thereby improving the overall strength of the device.

[0046] Step 3: The vertical installation of the reinforcing rib 202 can improve the strength of the connecting pipe 3. Reinforcing bars can be inserted into the connecting pipe 3. The support plate 101 is symmetrically installed inside the foundation pit. The symmetrical placement of the connecting pipe 3 can strengthen the support strength in the middle of the foundation pit by inserting reinforcing bars into the connecting pipe 3.

[0047] Example 2

[0048] like Figure 6 and 7 As shown, another embodiment of the present invention is provided. Based on embodiment 1, a circular groove is provided on one side of the housing 102, and the worm gear 107 passes through the circular groove.

[0049] like Figure 7 As shown, a constraint plate 114 is provided inside the housing 102, which constrains the position of the worm gear 106 inside the housing 102; an internal thread is provided inside the worm gear 106, and the worm gear 106 is threadedly connected to the lead screw 104.

[0050] like Figure 7The upper part has an installation hole in the support rod 103, and a fixing plate 111 is installed in the installation hole. The fixing plate 111 is connected to the lead screw 104 through a connecting bearing 112.

[0051] An extension ring 113 is provided at the bottom of the support rod 103, and a constricting cylinder 114 is provided on the housing 102. The diameter of the extension ring 113 is smaller than the diameter of the constricting cylinder 114.

[0052] This invention uses a constraint plate to limit the vertical position of the worm gear, and the worm is height-limited by the housing. A constricting sleeve and an extended ring are used to prevent the support rod from detaching from the housing. The worm gear is threadedly connected to the lead screw. When the worm drives the worm gear to rotate, because the worm gear is vertically limited, it can only drive the lead screw to rotate. The rotation of the lead screw causes it to move up and down relative to the worm gear. The top of the lead screw is connected to a fixed plate via a bearing, thus achieving the raising and lowering of the support rod through the rotation of the lead screw.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for preventing differential settlement at the interface between new and old water-stabilized base courses, characterized in that, Includes the following steps: Step 1: By rotating the handwheel (108) clockwise, the coaxially mounted worm gear (107) is driven to rotate, and the worm gear (107) meshes with the worm wheel (106) for transmission. Synchronously, when the worm gear (106) rotates, the drive screw (104) moves upward, and the top of the screw (104) pushes the support rod (103) upward. The upward movement of the support rod (103) is uniformly limited by the housing (102). Pushing the connecting plate (105) upward, the support plate (101) is attached to the edge of the pit opening, and the base (109) is attached to the bottom of the base layer; Step 2: The threaded rod (203) is rotated by the electric equipment to pass through the connecting block (201) and connect to the inner wall of the base layer, so as to stably fix the support plate (101) to the inner wall of the base layer and improve the stability of the fit with the inner wall of the base layer; then, a reinforcing rib (202) is set on the outside of the connecting block (201). Step 3: Reinforcing bars (202) are installed on the side of the connecting pipe (3) to enhance the strength of the connecting pipe (3) installation. Support plates (101) are symmetrically installed inside the foundation pit. Reinforcing bars are inserted into the connecting pipe (3) to enhance the support strength in the middle of the foundation pit.

2. The construction method for preventing differential settlement at the junction of old and new water-stabilized base courses according to claim 1, characterized in that, A connecting plate (105) is fixedly connected to the inner wall of the support plate (101), and a support rod (103) is rotatably connected to one side of the connecting plate (105). The support rod (103) is sleeved with a housing (102), and a lead screw (104) is installed inside the support rod (103). A worm gear (106) is installed on the lead screw (104), and a worm (107) is engaged on the outer side of the worm gear (106); a handwheel (108) is fixedly connected to the end of the worm (107); a base (109) is fixedly connected to the bottom end of the housing (102); the base (109) is located at the bottom of the support plate (101).

3. A construction method for preventing differential settlement at the interface between old and new water-stabilized base courses according to claim 1, characterized in that, The connecting assembly (2) includes a connecting block (201), a reinforcing rib (202) and a threaded rod (203). The connecting block (201) is inserted into the support plate (101), and the threaded rod (203) is threadedly connected to the inner wall of the connecting block (201). The end of the threaded rod (203) is confined within the support plate (101).

4. A construction method for preventing differential settlement at the interface between old and new water-stabilized base courses according to claim 1, characterized in that, The inner wall of the support plate (101) is provided with reinforcing ribs (202) on the upper and lower surfaces of the connecting pipe (3); the reinforcing ribs (202) are symmetrically distributed along the axis of the connecting pipe (3); The connecting pipe (3) is located on the outer surface of the support plate (101) and above the connecting plate (105); multiple sets of the connecting pipe (3) are provided and are arranged at equal intervals.

5. A construction method for preventing differential settlement at the junction of old and new water-stabilized base courses according to claim 1, characterized in that: There are five connecting blocks (201), which are arranged at equal intervals; the multiple sets of connecting blocks (201) and multiple sets of connecting pipes (3) are arranged in the same direction.

6. A construction method for preventing differential settlement at the junction of old and new water-stabilized base courses according to claim 1, characterized in that: A circular groove is provided on one side of the housing (102), and the worm (107) passes through the circular groove; A constraint plate (114) is provided inside the housing (102), and the constraint plate (114) constrains the position of the worm gear (106) inside the housing (102); An internal thread is provided in the worm gear (106), and the worm gear (106) is threadedly connected to the lead screw (104).

7. A construction method for preventing differential settlement at the junction of old and new water-stabilized base courses according to claim 1, characterized in that: The inner bottom wall of the support plate (101) is provided with a square groove (110), which is located above the base (109); the size of the square groove (110) is smaller than the size of the base (109).

8. A construction method for preventing differential settlement at the junction of old and new water-stabilized base courses according to claim 1, characterized in that: An installation hole is made in the support rod (103), and a fixing plate (111) is installed in the installation hole. The fixing plate (111) is connected to the lead screw (104) through a connecting bearing (112). An extension ring (113) is provided at the bottom of the support rod (103), and a closing cylinder (114) is provided on the housing (102). The diameter of the extension ring (113) is smaller than the diameter of the closing cylinder (114).

9. A construction method for preventing differential settlement at the junction of old and new water-stabilized base courses according to claim 1, characterized in that: The vertical cross-section of the housing (102) is rectangular; the vertical cross-section of the support component (1) is trapezoidal.

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