Municipal shallow laying and pressing pipeline excavation in-situ protection device and method

Abstract

The invention belongs to the technical field of municipal road repairing, and discloses a municipal shallow laying and pressing pipeline excavation in-situ protection device and method.The in-situ protection device comprises a supporting frame erected above a foundation pit in a height-adjustable mode; the adjusting disc is horizontally and rotatably arranged on the supporting frame, and a first locking assembly used for locking rotation of the adjusting disc is detachably arranged on the supporting frame; a hanging wheel assembly; the suspension rope is connected between the two sides of the supporting frame in a length-adjustable mode, and the two ends of the suspension rope are wound around the two pulleys of one pulley block respectively so that a U-shaped sleeve for pipeline erection can be formed between the two pulleys. By means of horizontal rotation of the rotating disc and vertical deflection of the pulley block, multi-directional inclination adjustment of the pipeline is achieved; the first end and the second end of the suspension rope can be pulled to achieve fine adjustment of the pipeline elevation, and the pipeline trial hoisting function is enriched; the whole device is easy and firm to adjust, high in adjusting accuracy and high in protection adaptability to municipal shallow buried pipelines, and in-situ protection of the pipelines can be achieved more conveniently and rapidly.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal road repair, and in particular relates to an in-situ protection device and method for excavation of municipal shallow pressure-laid pipelines. Background Art

[0002] In the municipal road repair and new pipeline construction, especially the construction of intersections, foundation pits need to be excavated. The underground pipelines are complex and changeable, and the protection of existing pipelines is extremely important. The conventional suspension protection method is usually adopted, and the pipelines are suspended and supported by clamps. This construction method is inefficient and easy to cause pipeline damage. The main reasons are: the angle and inclination of the pipeline cannot be adjusted, and the in-situ protection cannot be truly achieved; and some plastic pipelines on municipal roads are very old, and they are easily damaged if they are slightly offset or twisted; they cannot really play a protective role. Therefore, we propose an in-situ protection device and method for municipal shallow pressure pipeline excavation to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an in-situ protection device and method for municipal shallow pressure pipeline excavation, which solves the problem that the pipeline cannot be protected in situ.

[0004] The present invention is implemented by the following scheme: an in-situ protection device for excavation of shallow pressure-applied pipelines in municipalities, comprising:

[0005] A support frame is erected above the foundation pit with adjustable height;

[0006] An adjusting disk is horizontally rotatably arranged on a supporting frame, and a first locking component for locking the rotation of the adjusting disk is detachably arranged on the adjusting disk / supporting frame;

[0007] A hanging wheel assembly, the hanging wheel assembly comprising a shaft rotatably arranged at the bottom of the adjusting disk and at least one pulley block fixed on the shaft, each of the pulley blocks comprising two pulleys arranged at intervals, and a second locking assembly for locking the rotation of the shaft is arranged on the shaft / adjusting disk; and

[0008] The suspension rope is connected between the two sides of the support frame with adjustable length, and the two ends of the suspension rope are respectively passed around the two pulleys of a pulley block to form a U-shaped sleeve for laying the pipeline between the two pulleys.

[0009] The further improvement of the in-situ protection device for excavation of shallow pressure-applied pipelines in the municipality of the present invention is that the support frame comprises two leg groups arranged in an eight-shaped shape and a fixing plate fixed to the top of the two leg groups, each of the leg groups comprises two legs arranged in an eight-shaped shape, each of the legs comprises a support rod connected to the fixing plate at a first end and a support foot with an adjustable insertion depth sleeved on the second end of the support rod;

[0010] Each of the leg groups also includes a first fastening assembly which is detachably connected to the foot and is used to fix the support rod and the leg.

[0011] A further improvement of the in-situ protection device for municipal shallow pressure pipeline excavation according to the present invention is that the first fastening assembly includes a first bolt, a first connecting hole opened on the support leg, and a plurality of second connecting holes penetrating the second end of the support rod and arranged axially, the first bolt passes through the first connecting hole and is selectively connected to a plurality of second connecting holes to fix the support rod and the support leg; the first bolt passes through the first connecting hole and is connected to the second connecting holes at different positions to adjust the overall length of the support leg.

[0012] A further improvement of the in-situ protection device for municipal shallow pressure pipeline excavation according to the present invention is that each of the support leg groups further includes a retractable cross bar connected between the two support legs.

[0013] A further improvement of the in-situ protection device for municipal shallow pressure pipeline excavation according to the present invention is that the cross bar includes a sleeve rod and two sleeves respectively connected to two supporting legs, the first end and the second end of the sleeve rod are respectively inserted into the two sleeves and the insertion depth is adjustable, and the cross bar also includes two second fastening components respectively fixing the first end and the second end of the sleeve rod to the two sleeves.

[0014] A further improvement of the in-situ protection device for municipal shallow pressure-applied pipeline excavation of the present invention is that the adjusting disk comprises a rotating disk horizontally rotatably connected to the bottom of the fixed disk;

[0015] The first locking assembly includes a second bolt and a first nut. The fixed disk and the rotating disk are both provided with a plurality of arc-shaped locking openings spaced circumferentially for the second bolt to pass through and move. The second bolt selectively passes through an arc-shaped locking opening on the fixed disk and an arc-shaped locking opening on the rotating disk and is fixed by the first nut to fix the fixed disk and the rotating disk.

[0016] A further improvement of the in-situ protection device for excavation of shallow-layer pressure-applied pipelines in the present invention is that the adjusting disk further includes bearing plates fixedly connected to opposite ends of the rotating disk, both bearing plates are penetrated with through openings, the two ends of the shaft rod are rotatably inserted into the two through openings, and the bearing plates are also provided with an active cavity connected to the through openings and an active opening connected to the active cavity;

[0017] The second locking assembly includes an operating rod, an elastic member and a clamping block, wherein the clamping block is telescopically connected to the movable cavity through the elastic member. When the elastic member is in a reset state, the clamping block extends out of the movable cavity and penetrates into the through opening to lock the shaft rod to rotate by tightening the shaft rod. One end of the operating rod is connected to the clamping block, and the other end extends out of the load-bearing plate through the movable opening for external operation to release the lock of the shaft rod by the clamping block.

[0018] A further improvement of the in-situ protection device for municipal shallow pressure pipeline excavation according to the present invention is that the pulley block also includes a plate for fixing the two pulleys into a whole and a first clamping plate fixed to the top of the plate and fixed to the shaft rod, and the in-situ protection device also includes a third locking assembly for assisting in locking the rotation of the shaft rod by clamping the first clamping plate.

[0019] A further improvement of the in-situ protection device for municipal shallow pressure pipeline excavation according to the present invention is that the third locking assembly includes teeth arranged on the first clamping plate, a second clamping plate height-adjustably connected to the adjusting disk, and a tooth groove arranged on the second clamping plate.

[0020] A method for in-situ protection of shallow pressure-applied pipeline excavation in a municipal enterprise, characterized by comprising the following steps:

[0021] Providing an in-situ protection device as claimed in claim 1;

[0022] Adjust the height of the support frame and set it up above the foundation pit;

[0023] The adjusting disk is rotated horizontally to drive the hanging wheel assembly to rotate horizontally to the same angle as the pipeline, and the adjusting disk is locked by the first locking assembly;

[0024] The shaft is rotated to drive the pulley assembly to adjust the inclination, and then the shaft is locked by the second locking assembly;

[0025] The suspension rope is passed around the bottom of the pipeline, and the two ends of the suspension rope are passed around the two pulleys of a pulley block and then connected to the two sides of the support frame. By adjusting the length of the suspension rope between the two sides of the support frame, the U-shaped sleeve formed by the suspension rope between the two pulleys can lift the pipeline to its original position.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention realizes the adjustment of the multi-directional inclination of the pipeline by utilizing the horizontal rotation of the rotating disk and the vertical deflection of the pulley group; utilizes the pulley group and the suspension rope to convert the gravity of the pipeline into tension, thereby increasing the stability of the frame; the first end and the second end of the suspension rope can be pulled to achieve fine adjustment of the pipeline elevation, thereby enriching the pipeline trial hanging function; the entire device is simple and firm to adjust, with high adjustment accuracy, has stronger adaptability to the protection of municipal shallow buried pipelines, and can more conveniently and quickly realize the in-situ protection of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The overall structural diagram of the present invention is shown.

[0029] Figure 2A schematic diagram showing the positions of two pulley blocks of the present invention is shown.

[0030] Figure 3 A schematic diagram of the structure of the leg assembly of the present invention is shown.

[0031] Figure 4 A schematic diagram of the positions of the mounting plate and nail members of the present invention is shown.

[0032] Figure 5 A schematic structural diagram of a hanging wheel assembly of the present invention is shown.

[0033] Figure 6 A schematic structural diagram of a fourth locking assembly of the present invention is shown.

[0034] Figure 7 The present invention is shown Figure 6 Enlarged schematic diagram at point A in the middle.

[0035] Figure 8 A schematic diagram of the position of the first locking opening of the present invention is shown.

[0036] Fig. 9 A schematic structural diagram of the first locking assembly of the present invention is shown.

[0037] Fig.10 The present invention is shown Fig. 9 Enlarged schematic diagram of point B in the middle.

[0038] Fig.11 The schematic diagram of the pipeline suspension of the present invention is shown.

[0039] Fig.12 A schematic diagram of the position of the jack of the present invention is shown.

[0040] Fig.13 A schematic structural diagram of the second locking assembly of the present invention is shown.

[0041] In the figure: 1, support frame; 101, fixed plate; 1011, first locking hole; 102, leg; 1021, support rod; 1022, support foot; 1023, first fastening assembly; 1024, connecting end; 103, cross bar; 1031, sleeve; 1032, sleeve rod; 1033, second fastening assembly; 104, mounting plate; 105, nail; 2, adjustment plate; 201, rotating plate; 202, second locking hole; 203, second bolt; 3, hanging wheel assembly; 301, shaft rod; 302, pulley; 303, plate; 304 , the first clamping plate; 4, the suspension rope; 5, the pipeline; 6, the load-bearing plate; 601, the through port; 7, the third locking assembly; 701, the adjusting rod; 702, the second clamping plate; 703, the threaded rod; 704, the limiting hole; 705, the limiting rod; 8, the fourth locking assembly; 801, the plug hole; 802, the fourth bolt; 803, the second nut; 804, the winding mouth; 9, the second locking assembly; 901, the movable cavity; 902, the clamping block; 903, the movable port; 904, the operating rod; 905, the elastic member; 906, the contraction cavity; 907, the blocking plate. DETAILED DESCRIPTION

[0042] In order to solve the problem that pipelines cannot be protected in situ, the present invention provides an in situ protection device and method for shallow pressure-applied pipeline excavation in municipalities. The following is a further description of the in situ protection device and method for shallow pressure-applied pipeline excavation in municipalities by using specific embodiments in combination with the accompanying drawings.

[0043] See also Figures 1 to 13 As shown, an in-situ protection device for excavation of shallow pressure-applied pipelines in municipalities includes:

[0044] A support frame 1 is erected above the foundation pit in an adjustable height;

[0045] The adjusting disk 2 is horizontally rotatably arranged on the supporting frame 1, and a first locking component for locking the rotation of the adjusting disk 2 is detachably arranged on the adjusting disk 2 / supporting frame 1;

[0046] A hanging wheel assembly 3, the hanging wheel assembly 3 includes a shaft 301 rotatably arranged at the bottom of the adjusting disk 2 and at least one pulley block fixed on the shaft 301, each pulley block includes two pulleys 302 arranged at intervals, and a second locking assembly 9 for locking the rotation of the shaft 301 is arranged on the shaft 301 / adjusting disk 2; and

[0047] The suspension rope 4 is connected between the two sides of the support frame 1 with adjustable length, and the two ends of the suspension rope 4 are respectively passed around two pulleys 302 of a pulley block to form a U-shaped sleeve between the two pulleys 302 for the pipeline 5 to be laid.

[0048] Further, see Fig.13As shown, the in-situ protection device also includes a fourth locking assembly 8 for fixing the suspension rope 4 on the support frame 1, and the fourth locking assembly 8 includes two locking pieces respectively arranged on the two cross bars 103, each locking piece includes a second nut 803, a socket 801 passing through the sleeve 1031, a fourth bolt 802 whose first end is fixed in the socket 801 and whose second end extends out of the socket 801, and a winding opening 804 passing through the second end of the fourth bolt 802, the first end and the second end of the suspension rope 4 respectively pass through the two winding openings 804 and are wound around the outside of the second ends of the two fourth bolts 802, and then the two second nuts 803 are tightened respectively to clamp and fix the two ends of the suspension rope 4.

[0049] By tightening the second nut 803 on the second end of the fourth bolt 802 , the suspension rope 4 wound around the fourth bolt 802 can be clamped and fixed in cooperation with the sleeve 1031 to ensure the stability of the suspension pipeline 5 .

[0050] Among them, see Figure 1-3 As shown, the support frame 1 includes two leg groups arranged in an eight-shaped shape and a fixing plate 101 fixed to the top of the two leg groups, each leg group includes two legs 102 arranged in an eight-shaped shape, and each leg 102 includes a support rod 1021 connected to the fixing plate 101 at a first end and a support foot 1022 with an adjustable insertion depth and sleeved on the second end of the support rod 1021;

[0051] Each leg assembly further includes a first fastening assembly 1023 detachably connected to the leg 1022 and used to fix the support rod 1021 to the leg 102;

[0052] The first fastening assembly 1023 includes a first bolt, a first connecting hole opened on the support leg 1022, and a plurality of second connecting holes penetrating the second end of the support rod 1021 and arranged axially. The first bolt passes through the first connecting hole and is selectively connected to the plurality of second connecting holes to fix the support rod 1021 to the support leg 1022; the first bolt passes through the first connecting hole and is connected to the second connecting holes at different positions to adjust the overall length of the support leg 102.

[0053] For details, see Figure 3As shown, a connecting section 1024 is formed at the first end of the support rod 1021, and the connecting section 1024 can be fixedly connected to the fixing plate 101 by bolts, so as to facilitate disassembly, assembly, adjustment and use; the first connecting hole is a first through hole, and the second connecting hole is a first screw hole. By adjusting the depth of the second end of the support rod 1021 inserted into the support leg 1022, the height of the support leg 102 can be adjusted, thereby achieving the height adjustment of the entire support frame 1; a mounting plate 104 is fixedly connected to the support leg 1022, and a nail 105 is arranged on the mounting plate 104. When installing the support frame 1, the mounting plate 104 can be buried in the soil, and then the nail 105 can be nailed into the soil layer, so as to improve the stability of the support frame 1.

[0054] Among them, see Figure 3 As shown, each leg group further includes a retractable cross bar 103 connected between two legs 102.

[0055] The crossbar 103 includes a sleeve rod 1032 and two sleeves 1031 respectively connected to the two legs 1022. The first end and the second end of the sleeve rod 1032 are respectively inserted into the two sleeves 1031, and the insertion depth is adjustable. The crossbar 103 also includes two second fastening components 1033 that respectively fix the first end and the second end of the sleeve rod 1032 to the two sleeves 1031.

[0056] Specifically, the second fastening assembly 1033 includes a third bolt, two second through holes respectively opened on the two sleeves 1031, and two groups of second screw holes respectively penetrating the first end and the second end of the sleeve rod 1032 and arranged along the axial direction. The third bolt passes through the second through hole and is selectively screwed into the second screw holes to fix the sleeve rod 1032 and the sleeve 1031; the third bolt passes through the second through hole and is screwed into the second screw holes at different positions to adjust the overall length of the cross bar 103.

[0057] By adjusting the depth of the first end and the second end of the sleeve rod 1032 inserted into the sleeves 1031 at both ends, the overall length of the cross bar 103 can be adjusted to adapt to the adjustment of the height of the supporting legs 102.

[0058] Among them, see Fig.11 As shown, the adjustment disk 2 includes a rotating disk 201 horizontally rotatably connected to the bottom of the fixed disk 101;

[0059] The first locking assembly includes a second bolt 203 and a first nut. The fixed disk 101 and the rotating disk 201 are both provided with a plurality of arc-shaped locking openings spaced along the circumferential direction for the second bolt 203 to pass through and move. The second bolt 203 selectively passes through an arc-shaped locking opening on the fixed disk 101 and an arc-shaped locking opening on the rotating disk 201 and is fixed by the first nut, so as to fix the fixed disk 101 and the rotating disk 201.

[0060] The second locking opening 202 is arc-shaped, and the second locking opening 202 and the rotating disk 201 have the same center.

[0061] Specifically, the overall length of the fixed disk 101 can be replaced according to actual usage, so as to adapt to and connect more adjustment disks 2, so that the same support frame 1 can suspend multiple pipelines 5; the locking opening opened on the fixed disk 101 is the first locking opening 1011, and the locking opening opened on the rotating disk 201 is the second locking opening 202; by passing the second bolt 203 through the first locking opening 1011 and the second locking opening 202, and tightening the first nut to abut against the rotating disk 201, the rotating disk 201 can be fixed and cannot be rotated for adjustment; due to the existence of the arc-shaped second locking opening 202, when the first nut is loosened, the rotating disk 201 can be rotated to adjust its angle. During this period, the second bolt 203 is not obstructed in the arc-shaped second locking opening 202. After the adjustment is completed, the second nut is tightened to fix it, which is convenient for adjustment.

[0062] Among them, see Figure 9-10 As shown, the adjusting disk 2 further includes a bearing plate 6 fixedly connected to opposite ends of the rotating disk 201, and both bearing plates 6 are penetrated with a through hole 601, and both ends of the shaft 301 are rotatably inserted into the two through holes 601, and the bearing plates 6 are also provided with an active cavity 901 connected to the through hole 601 and an active hole 903 connected to the active cavity 901;

[0063] The second locking assembly 9 includes an operating rod 904, an elastic member 905 and a clamping block 902. The clamping block 902 is telescopically connected to the movable cavity 901 through the elastic member 905. When the elastic member 905 is in the reset state, the clamping block 902 extends out of the movable cavity 901 and penetrates into the through opening 601 to lock the shaft 301 for rotation by tightening the shaft 301. One end of the operating rod 904 is connected to the clamping block 902, and the other end extends out of the load-bearing plate 6 through the movable opening 903 for external operation to release the locking of the shaft 301 by the clamping block 902.

[0064] For details, see Fig.10 As shown, a contraction cavity 906 located on the same side as the movable opening 903 is provided on the load-bearing plate 6. There are two contraction cavities 906, which are respectively located on both sides of the operating rod 904. A blocking plate 907 is slidably arranged in the contraction cavity 906. A baffle plate is fixed to the second end of the operating rod 904. By pulling the operating rod 904 outward so that the clamping block 902 is not in contact with the shaft rod 301, the lock on the shaft rod 301 can be released, and then the baffle plates 907 at both ends are pulled to slide relative to each other and press against the baffle plate, so as to facilitate the subsequent adjustment of the inclination angle of the hanging wheel assembly 3 to better adapt to the position of the pipeline 5, thereby achieving an in-situ protection effect; anti-slip grooves are arranged on the contact surface between the clamping block 902 and the shaft rod 301 to improve the clamping degree of the two; the elastic member 905 can be a spring.

[0065] Among them, see Figure 6-7 As shown, the pulley block further includes a plate 303 for fixing the two pulleys 302 into a whole and a first clamping plate 304 fixed to the top of the plate 303 and fixed to the shaft 301, and the in-situ protection device further includes a third locking component 7 for assisting in locking the rotation of the shaft 301 by clamping the first clamping plate 304;

[0066] The third locking assembly 7 includes teeth arranged on the first clamping plate 304, a second clamping plate 702 height-adjustably connected to the adjustment disk 2, and a tooth groove arranged on the second clamping plate 702, wherein the teeth are meshed with the tooth groove;

[0067] Specifically, the third locking assembly 7 also includes an adjusting rod 701 rotatably connected to the adjusting disk 2, a threaded rod 703 fixedly connected to the adjusting rod 701 and located at the bottom of the adjusting disk 2, a limiting hole 704 opened on the adjusting disk 2, and a limiting rod 705 fixed on the second clamping plate 702 and inserted into the limiting hole 704. The second clamping plate 702 is threadedly connected to the threaded rod 703. Turning the adjusting rod 701 drives the threaded rod 703 to rotate, and then the height of the second clamping plate 702 is reduced and the teeth are inserted into the tooth groove to realize the rotation of the auxiliary locking shaft 301.

[0068] By turning the adjusting rod 701, the second clamping plate 702 can be raised and lowered due to the existence of the thread, the limiting hole 704 and the limiting rod 705 cooperating to limit the second clamping plate 702. When the second clamping plate 702 rises to make the teeth disengage from the tooth groove, the fixation of the pulley group is released. When the second clamping plate 702 falls to make the teeth engage with the tooth groove, the fixation of the pulley group is achieved, and the adjustment is convenient.

[0069] A method for in-situ protection of shallow pressure-applied pipeline excavation in a municipal enterprise, characterized by comprising the following steps:

[0070] Providing an in-situ protection device as described above;

[0071] By adjusting the depth of the first end and the second end of the sleeve rod 1032 inserted into the sleeves 1031 at both ends, the overall length of the crossbar 103 can be adjusted. By adjusting the depth of the second end of the support rod 1021 inserted into the support leg 1022, the height of the support leg 102 can be adjusted. The second fastening assembly 1033 and the first fastening assembly 1023 are used to fix them respectively, and then the adjusted support frame 1 is erected above the excavated foundation pit.

[0072] The adjusting plate 2 is rotated horizontally to drive the hanging wheel assembly 3 to rotate horizontally to the same angle as the pipeline 5, and then the rotating plate 201 is fixed by passing the second bolt 203 through the first locking opening 1011 and the second locking opening 202, and tightening the first nut to abut against the rotating plate 201;

[0073] First, pull the operating rod 904 outward to drive the clamping block 902 to stop contacting the shaft 301, and turn the adjusting rod 701 to rotate. Due to the existence of the thread, the limiting hole 704 and the limiting rod 705 cooperate to limit the second clamping plate 702, so that the second clamping plate 702 can be raised to make the teeth disengage from the tooth groove, and then the shaft 301 can be rotated to drive the pulley block to adjust the inclination, and then the elastic member 905 is used to push the clamping block 902 and the shaft 301 to be tightly fixed, and then the adjusting rod 701 is turned to make the second clamping plate 702 descend so that the teeth mesh with the tooth groove, and the pulley block can be fixed;

[0074] The suspension rope 4 is passed around the bottom of the pipeline 5, and the two ends of the suspension rope 4 are passed around the two pulleys 302 of a pulley block respectively, so as to form a U-shaped sleeve for the pipeline 5 to be erected between the two pulleys 302, and the pipeline 5 is lifted to its original position by adjusting the length of the suspension rope 4 between the two sides of the support frame 1, and the two ends of the suspension rope 4 are passed through the winding openings 804 on the two locking members respectively and wound around the second end of the fourth bolt 802, and then the second nut 803 is tightened on the second end of the fourth bolt 802, which can cooperate with the sleeve 1031 to clamp and fix the suspension rope 4 wound around the fourth bolt 802, so as to stably lift the pipeline 5 to its original position.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0076] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. An in-situ protection device for municipal shallow pressure pipeline excavation, characterized in that: include: A support frame is erected above the foundation pit with adjustable height; An adjusting disk is horizontally rotatably arranged on a supporting frame, and a first locking component for locking the rotation of the adjusting disk is detachably arranged on the adjusting disk / supporting frame; A hanging wheel assembly, the hanging wheel assembly comprising a shaft rotatably arranged at the bottom of the adjusting disk and at least one pulley block fixed on the shaft, each of the pulley blocks comprising two pulleys arranged at intervals, and a second locking assembly for locking the rotation of the shaft is arranged on the shaft / adjusting disk; and The suspension rope is connected between the two sides of the support frame with adjustable length, and the two ends of the suspension rope are respectively passed around the two pulleys of a pulley block to form a U-shaped sleeve for laying the pipeline between the two pulleys.

2. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 1 is characterized in that: The support frame includes two leg groups arranged in an eight-shaped shape and a fixing plate fixed to the top of the two leg groups, each of the leg groups includes two legs arranged in an eight-shaped shape, and each of the legs includes a support rod connected to the fixing plate at a first end and a support foot with an adjustable insertion depth sleeved on the second end of the support rod; Each of the leg groups also includes a first fastening assembly which is detachably connected to the foot and is used to fix the support rod and the leg.

3. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 2 is characterized in that: The first fastening assembly includes a first bolt, a first connecting hole opened on the support leg, and a plurality of second connecting holes penetrating the second end of the support rod and arranged axially. The first bolt passes through the first connecting hole and is selectively connected to a plurality of second connecting holes to fix the support rod to the support leg; the first bolt passes through the first connecting hole and is connected to the second connecting holes at different positions to adjust the overall length of the support leg.

4. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 2 is characterized in that: Each of the leg groups further includes a telescopic crossbar connected between the two legs.

5. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 4 is characterized in that: The cross bar includes a sleeve rod and two sleeves respectively connected to two supporting legs. The first end and the second end of the sleeve rod are respectively inserted into the two sleeves and the insertion depth is adjustable. The cross bar also includes two second fastening components that respectively fix the first end and the second end of the sleeve rod to the two sleeves.

6. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 2, characterized in that: The adjusting disk comprises a rotating disk horizontally rotatably connected to the bottom of the fixed disk; The first locking assembly includes a second bolt and a first nut. The fixed disk and the rotating disk are both provided with a plurality of arc-shaped locking openings spaced circumferentially for the second bolt to pass through and move. The second bolt selectively passes through an arc-shaped locking opening on the fixed disk and an arc-shaped locking opening on the rotating disk and is fixed by the first nut to fix the fixed disk and the rotating disk.

7. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 6 is characterized in that: The adjusting disk also includes bearing plates fixedly connected to opposite ends of the rotating disk, both bearing plates are penetrated with through holes, the two ends of the shaft rod are rotatably inserted into the two through holes, and the bearing plates are also provided with an active cavity connected to the through hole and an active hole connected to the active cavity; The second locking assembly includes an operating rod, an elastic member and a clamping block, wherein the clamping block is telescopically connected to the movable cavity through the elastic member. When the elastic member is in a reset state, the clamping block extends out of the movable cavity and penetrates into the through opening to lock the shaft rod to rotate by tightening the shaft rod. One end of the operating rod is connected to the clamping block, and the other end extends out of the load-bearing plate through the movable opening for external operation to release the lock of the shaft rod by the clamping block.

8. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 1, characterized in that: The pulley block also includes a plate for fixing the two pulleys into a whole and a first clamping plate fixed to the top of the plate and fixed to the shaft rod. The in-situ protection device also includes a third locking component that assists in locking the rotation of the shaft rod by clamping the first clamping plate.

9. The in-situ protection device for excavation of shallow pressure-applied pipelines in municipal affairs as claimed in claim 8, characterized in that: The third locking assembly includes teeth arranged on the first clamping plate, a second clamping plate connected to the adjusting disk in a height-adjustable manner, and a tooth groove arranged on the second clamping plate.

10. A method for in-situ protection of shallow pressure-applied pipeline excavation involving municipal affairs, characterized in that: The following steps are involved: Providing an in-situ protection device as claimed in claim 1; Adjust the height of the support frame and set it up above the foundation pit; The adjusting disk is rotated horizontally to drive the hanging wheel assembly to rotate horizontally to the same angle as the pipeline, and the adjusting disk is locked by the first locking assembly; The shaft is rotated to drive the pulley assembly to adjust the inclination, and then the shaft is locked by the second locking assembly; The suspension rope is passed around the bottom of the pipeline, and the two ends of the suspension rope are passed around the two pulleys of a pulley block and then connected to the two sides of the support frame. By adjusting the length of the suspension rope between the two sides of the support frame, the U-shaped sleeve formed by the suspension rope between the two pulleys can lift the pipeline to its original position.

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