Movable retaining wall for pipeline excavation support and construction method

Abstract

The invention relates to the technical field of tunnel supporting, in particular to a movable retaining wall for pipeline excavation supporting and a construction method.The movable retaining wall comprises a plurality of first keels and a plurality of second keels, the first keels are jointly and fixedly connected with a baffle, the second keels are jointly and fixedly connected with the baffle, and the baffle is fixedly connected with the first keels and the second keels. A supporting mechanism is installed on the first keel and connected with the second keel, fixing mechanisms are further installed on the first keel and the second keel, and a stabilizing mechanism for reducing loosening of the side wall of the tunnel is installed on the baffle. The method has the effects that the probability of loosening caused by extrusion and deformation of the side wall of the tunnel is reduced, and the supporting effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel support, and in particular to a movable retaining wall for pipeline excavation support and a construction method. Background Art

[0002] Pipeline installation is an indispensable part of infrastructure construction and is widely used in many industries such as petroleum, chemical, metallurgy, pharmaceutical, energy, environmental protection, municipal water supply and drainage. During the pipeline installation process, excavation and support work are particularly important. The main purpose of the support project is to protect the ground and side walls after excavation to prevent them from collapsing due to loss of support. Support projects are of great significance to ensuring construction safety and improving project quality. Common support forms for pipeline installation include steel sheet piles and steel supports, soil nail walls, etc. Compared with movable retaining wall support structures, the economy and convenience of steel sheet piles or soil nail walls are poor.

[0003] The Chinese patent with the authorization announcement number CN220521358U discloses a pipeline trench rotatable and movable support device, including two symmetrically arranged bearing plates, the opposite surfaces of the two bearing plates are provided with a bearing frame of the same specification, the bearing frame includes a number of horizontal keels fixed in parallel to the bearing plates, and the bearing plates are also fixed with a number of vertical keels staggered with the horizontal keels, wherein the two bearing plates are connected by an intermediate force transmission strut, and the two ends of the intermediate force transmission strut are fixed by anchor bolts. However, during the construction process after the support, the side walls of the tunnel on both sides will become loose due to extrusion and deformation, which reduces the effect of the support and increases the risk of tunnel collapse. Summary of the invention

[0004] In order to reduce the probability of the tunnel side wall being loosened due to compression and deformation and to improve the support effect, the present application provides a movable retaining wall and a construction method for pipeline excavation support.

[0005] In the first aspect, the present application provides a movable retaining wall for pipeline excavation support, which adopts the following technical solution: A movable retaining wall for supporting pipeline excavation comprises a plurality of first keels and a plurality of second keels, a baffle being fixedly connected to the plurality of first keels, and the baffle being fixedly connected to the plurality of second keels, a supporting mechanism being installed on the first keels, the supporting mechanism being connected to the second keels, a fixing mechanism being also installed on the first keels and the second keels, and a stabilizing mechanism for reducing looseness of a tunnel side wall being installed on the baffle.

[0006] By adopting the above technical solution, when supporting the tunnel, the first keel and the second keel are first installed on the bottom wall of the tunnel through the fixing mechanism, and then the stabilizing mechanism is adjusted to be close to the side walls at both ends of the tunnel, thereby achieving tunnel support. At the same time, the stabilizing mechanism reduces the probability of loosening of the tunnel side walls.

[0007] Optionally, the stabilizing mechanism includes a fixed shaft, which is fixedly connected to the end faces of the two baffles away from each other, and a first sliding groove is opened along the length direction on the end face of the fixed shaft away from the baffle, a sliding shaft is slidably connected in the first sliding groove, an end of the sliding shaft away from the baffle is fixedly connected to a stabilizing plate, an end of the stabilizing plate away from the sliding shaft abuts against the side wall of the tunnel, a first spring is fixedly connected to the bottom wall of the first sliding groove, and an end of the first spring away from the baffle is fixedly connected to the sliding shaft.

[0008] By adopting the above technical solution, when supporting the tunnel, the supporting mechanism presses the stabilizing plate against the side wall of the tunnel through the baffle. At this time, the first spring is squeezed and contracted by the supporting mechanism and the side wall of the tunnel, and then a force appears to push the stabilizing plate to move toward the side wall of the tunnel. When the side wall of the tunnel becomes loose, the first spring will drive the sliding rod to slide in the direction of the side wall of the tunnel, and the sliding rod drives the stabilizing plate to press against the loose side wall of the tunnel.

[0009] Optionally, the supporting mechanism includes a fixing rod, a connecting assembly is installed on the fixing rod, the fixing rod is connected to the first keel via the connecting assembly, a second sliding groove is opened along the length direction on the end surface of the fixing rod away from the first keel, a sliding rod is slidably connected in the second sliding groove, one end of the sliding rod away from the first keel is connected to the second keel via the connecting assembly, and a locking assembly for locking the fixing rod and the sliding rod is also installed on the fixing rod.

[0010] By adopting the above technical solution, when the stabilizing plate is pressed against the side wall of the tunnel, the stabilizing plate on the side of the first keel is first pressed against the side wall of the tunnel, and then the sliding rod is slid so that the stabilizing plate on the side of the second keel is pressed against the side wall of the tunnel, and then the locking assembly is adjusted to lock the fixed rod and the sliding rod.

[0011] Optionally, a third sliding groove is provided on the end surface of the fixing rod away from the bottom wall of the tunnel along the length direction, and the locking assembly includes a rack, which is slidably connected in the third sliding groove and fixedly connected to the sliding rod, and two first mounting plates are fixedly connected to the end surface of the fixing rod away from the bottom wall of the tunnel, and the two first mounting plates are rotatably connected to a rotating shaft together, and the rotating shaft is fixedly connected to a gear, and the gear is meshed with the rack, and a fourth sliding groove is provided on the end surface of the fixing rod with the third sliding groove along the width direction, and the first sliding block is slidably connected in the fourth sliding groove, and a seventh sliding groove is provided on the end surface of the first sliding block close to the gear, and a third lead screw is rotatably connected in the seventh sliding groove, and a locking block is also slidably connected to the seventh sliding groove, and the locking block is threadedly connected to the third lead screw.

[0012] By adopting the above technical solution, when adjusting the sliding length of the sliding rod, the rotating shaft is manually rotated, the rotating shaft drives the gear to rotate, the gear drives the rack to slide, the rack drives the sliding rod to slide, and when the sliding rod presses the stabilizing plate against the side wall of the tunnel through the baffle, the third screw is manually rotated, the third screw drives the locking block to move to the groove on the gear, and then the first slider is slid, and the first slider drives the locking block to be inserted into the groove of the gear, thereby preventing the gear from rotating, thereby achieving locking of the fixed rod and the sliding rod.

[0013] Optionally, a fifth sliding groove is provided on the end surface of the fixing rod away from the bottom wall of the tunnel along the length direction, and a sixth sliding groove is provided on the side wall of the fixing rod along the length direction, and the locking assembly includes a second mounting plate, the second mounting plate is fixedly connected to the side wall of the fixing rod, the second mounting plate is rotatably connected to the first lead screw, a second slider is slidably connected in the sixth sliding groove, the second slider is threadedly connected to the first lead screw, a first groove is provided on the end surface of the second slider away from the bottom wall of the tunnel, a rotating rod is rotatably connected in the first groove, a third slider is slidably connected in the fifth sliding groove, the third slider is fixedly connected to the sliding rod, and a second groove is provided on the end surface of the third slider away from the sliding rod.

[0014] By adopting the above technical solution, when adjusting the sliding length of the sliding rod, first rotate the rotating rod into the second groove, and then manually rotate the first screw, the first screw drives the second slider to slide, the second slider drives the third slider to slide through the rotating rod, and the third slider drives the sliding rod to slide out of the second sliding groove until the stabilizing plate is pressed against the side wall of the tunnel, thereby improving the applicability of the movable retaining wall used for pipeline excavation support.

[0015] Optionally, the connecting assembly includes two connecting plates, which are respectively fixedly connected to the end faces of the fixing rod and the sliding rod that are away from each other, and the end faces of the first keel and the second keel that are close to each other are each provided with a plurality of screw holes. The connecting assembly also includes a plurality of fixing bolts, which respectively pass through the two connecting plates and are threadedly connected in the plurality of screw holes.

[0016] By adopting the above technical solution, the arrangement of the connecting plate and the fixing bolts realizes the detachable connection between the fixing rod and the sliding rod, thereby facilitating the installation of the fixing rod and the sliding rod.

[0017] Optionally, the fixing mechanism includes a plurality of tapered rods, and the plurality of tapered rods are respectively fixedly connected to the first keel and the second keel close to the bottom wall of the tunnel.

[0018] By adopting the above technical solution, when the first keel and the second keel are fixed, the conical rod is inserted into the bottom wall of the pit, thereby making the installation of the first keel and the second keel more stable.

[0019] Optionally, an eighth slide groove is provided inside the conical rod, a ninth slide groove connected with the eighth slide groove is provided on the side wall of the conical rod, a rotating groove connected with the eighth slide groove is also provided on the side wall of the conical rod, a reinforcement component is installed on the conical rod, the reinforcement component includes a reinforced conical rod, the reinforced conical rod is slidably connected in the ninth slide groove, a second lead screw is rotatably connected in the eighth slide groove, a conical block is also slidably connected in the eighth slide groove, the conical block is threadedly connected to the second lead screw, a worm is rotatably connected in the rotating groove, a worm wheel is fixedly connected to the second lead screw, and the worm is meshed with the worm wheel.

[0020] By adopting the above technical solution, after the conical rod is inserted into the bottom wall of the tunnel, the worm is manually rotated, the worm drives the second screw to rotate, the second screw drives the conical block to slide, and the conical block drives the reinforced conical rod to slide out of the ninth slide groove, thereby realizing the reinforcement of the conical rod, making the fixation of the first keel and the second keel more stable.

[0021] Optionally, a limiting groove is provided on the side wall of the ninth slide groove, the reinforcement assembly also includes a limiting member, the limiting member includes a limiting block, the limiting block is slidably connected in the limiting groove, the limiting block is fixedly connected to the reinforcing conical rod, a second spring is fixedly connected on the side wall of the limiting groove away from the conical block, and the second spring is fixedly connected to the limiting block at one end close to the conical block.

[0022] By adopting the above technical solution, when the conical rod is pulled out, the worm is manually rotated in the opposite direction, the worm drives the worm wheel to rotate in the opposite direction, the worm wheel drives the second lead screw to rotate in the opposite direction, the second lead screw drives the conical block to slide in the opposite direction, and the second spring drives the reinforced conical rod to slide into the ninth slide groove through the limit block, thereby facilitating the pulling out of the conical rod.

[0023] In the second aspect, the present application provides a construction method for pipeline excavation support, which adopts the following technical solution: A construction method for pipeline excavation support comprises the following steps: Step 1: Draw the excavation diagram according to the pipeline layout diagram and determine the excavation depth and width.

[0024] Step 2: According to the excavation drawing, select the appropriate first keel and second keel, and use the fixing rod and the sliding rod to make the stabilizing plate press against the two side walls of the tunnel.

[0025] Step 3: Carry out excavation and support in sections. After each section is excavated, the movable retaining wall is immediately lowered for support to ensure construction safety.

[0026] Step 4: Install or maintain the pipeline. After the pipeline is installed, use engineering machinery to pull out the movable retaining wall and backfill the earth in time.

[0027] Step 5: The pulled out movable retaining wall can be used to support the next section of the pipeline after simple maintenance.

[0028] By adopting the above technical solution and repeating the above steps, work efficiency can be improved and project cost can be reduced.

[0029] In summary, this application includes the following beneficial technical effects: 1. When supporting the tunnel, the support mechanism abuts the stabilizing plate against the side wall of the tunnel through the baffle. At this time, the first spring is squeezed and contracted by the support mechanism and the side wall of the tunnel, and a force is generated to push the stabilizing plate to move toward the side wall of the tunnel. When the side wall of the tunnel becomes loose, the first spring drives the sliding rod to slide toward the side wall of the tunnel, and the sliding rod drives the stabilizing plate to press against the loose side wall of the tunnel, thereby reducing the probability of the side wall of the tunnel being squeezed and deformed to become loose, and improving the support effect; 2. When fixing the first keel and the second keel, the tapered rod is inserted into the bottom wall of the pit, thereby making the installation of the first keel and the second keel more stable; 3. When adjusting the sliding length of the sliding rod, first rotate the rotating rod into the second groove, then manually rotate the first screw, the first screw drives the second slider to slide, the second slider drives the third slider to slide through the rotating rod, and the third slider drives the sliding rod to slide out of the second slide groove until the stabilizing plate is pressed against the side wall of the tunnel, thereby improving the applicability of the movable retaining wall for pipeline excavation support; 4. When pulling out the tapered rod, manually rotate the worm in the opposite direction, the worm drives the worm wheel to rotate in the opposite direction, the worm wheel drives the second lead screw to rotate in the opposite direction, the second lead screw drives the tapered block to slide in the opposite direction, and the second spring drives the reinforced tapered rod to slide into the ninth slide groove through the limit block, thereby facilitating the pulling out of the tapered rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a movable retaining wall used for pipeline excavation support in Example 1 of the present application; Figure 2 is a cross-sectional view of the stabilizing mechanism in Example 1 of the present application; Figure 3 This is a schematic diagram of the structure of the support mechanism in Example 1 of the present application; Figure 4 is a cross-sectional view of the locking assembly in Example 1 of the present application; Figure 5 is a cross-sectional view of the fixing mechanism in Example 1 of the present application; Figure 6 For this application Figure 5 A magnified view of part A; Figure 7 This is a schematic diagram of the structure of the locking assembly in Example 2 of the present application.

[0031] 1. First keel; 2. Second keel; 3. Baffle; 4. Support mechanism; 41. Fixing rod; 411. Second slide slot; 412. Third slide slot; 413. Fourth slide slot; 414. Fifth slide slot; 415. Sixth slide slot; 42. Sliding rod; 43. Locking assembly; 431. Rack; 432. First mounting plate; 433. Rotating shaft; 434. Gear; 435. First slider; 436. Locking block; 437. Third lead screw; 438. Seventh slide slot; 441. Second mounting plate; 442. First lead screw; 443. Second slider; 444. Rotating rod; 445. Third slider; 446. First Groove; 447, second groove; 45, connecting assembly; 451, connecting plate; 452, fixing bolt; 453, gasket; 454, perforation hole; 5, stabilizing mechanism; 51, fixed shaft; 511, first slide groove; 52, sliding shaft; 53, first spring; 54, stabilizing plate; 6, fixing mechanism; 61, tapered rod; 611, eighth slide groove; 612, ninth slide groove; 613, rotating groove; 614, limiting groove; 62, reinforcing assembly; 621, reinforcing tapered rod; 622, worm wheel; 623, worm; 624, second lead screw; 625, tapered block; 63, limiting member; 631, limiting block; 632, second spring; 7, lifting ring. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0033] An embodiment of the present application discloses a movable retaining wall for supporting pipeline excavation.

[0034] Embodiment 1: refer to Figure 1 A movable retaining wall for pipeline excavation support includes multiple first keels 1 and multiple second keels 2, a baffle 3 is fixedly connected to the multiple first keels 1, and a baffle 3 is also fixedly connected to the multiple second keels 2. A supporting mechanism 4 is also installed on the first keel 1, and the supporting mechanism 4 is connected to the second keel 2. A fixing mechanism 6 for fixing to the bottom wall of the tunnel is also installed on the first keel 1 and the second keel 2. Multiple lifting rings 7 are fixedly connected to the first keel 1 and the second keel 2 away from the bottom wall of the tunnel, and a stabilizing mechanism 5 for reducing the looseness of the tunnel side wall is installed on the baffle 3.

[0035] When supporting a tunnel, first fix the first keel 1, the second keel 2 and the baffle 3 in the tunnel through the fixing mechanism 6, and then manually adjust the supporting mechanism 4. The supporting mechanism 4 drives the two baffles 3 to move toward the side wall of the tunnel through the first keel 1 and the second keel 2. The baffle 3 drives the stabilizing mechanism 5 to abut against the side wall of the tunnel, thereby achieving tunnel support. At the same time, the stabilizing mechanism 5 reduces the probability of the side wall of the tunnel being loosened due to compression and deformation, thereby improving the support effect.

[0036] refer to Figure 1 and Figure 2 The stabilizing mechanism 5 includes a plurality of fixed shafts 51, which are respectively fixedly connected to the end surfaces of the two baffles 3 away from each other. A first sliding groove 511 is provided on the end surface of the fixed shaft 51 away from the baffle 3, and a sliding shaft 52 is slidably connected in the first sliding groove 511. One end of the plurality of sliding shafts 52 away from the baffle 3 is commonly fixedly connected to a stabilizing plate 54, and a first spring 53 is fixedly connected to the bottom wall of the first sliding groove 511, and one end of the first spring 53 away from the baffle 3 is fixedly connected to the sliding shaft 52.

[0037] When supporting the tunnel, the support mechanism 4 abuts the stabilizing plate 54 against the side wall of the tunnel through the baffle plate 3. At this time, the first spring 53 is squeezed and contracted by the support mechanism 4 and the side wall of the tunnel, and then a force is generated to push the stabilizing plate 54 to move toward the side wall of the tunnel. When the side wall of the tunnel becomes loose, the first spring 53 will drive the sliding rod 42 to slide toward the side wall of the tunnel, and the sliding rod 42 drives the stabilizing plate 54 to press against the loose side wall of the tunnel. refer to Figure 3 and Figure 4 The supporting mechanism 4 includes a plurality of fixing rods 41, each of which is provided with a connecting assembly 45, and each of which is provided with a locking assembly 43. A second sliding groove 411 is provided on the end surface of the fixing plate away from the first keel 1 along the length direction, and a sliding rod 42 is slidably connected in the second sliding groove 411. One end of the sliding rod 42 away from the first keel 1 is provided on the second keel 2 through the connecting assembly 45, and a locking assembly 43 is also provided on the fixing rod 41.

[0038] A third sliding groove 412 is provided on the end surface of the fixing rod 41 away from the bottom wall of the tunnel along the length direction, and the locking assembly 43 includes a rack 431, which is slidably connected in the third sliding groove 412 and fixedly connected to one end of the sliding rod 42 away from the bottom wall of the tunnel. Two first mounting plates 432 are also fixedly connected to the end surface of the fixing rod 41 away from the bottom wall of the tunnel, and a rotating shaft 433 is rotatably connected to the end surfaces of the two first mounting plates 432 close to each other, and a gear 434 is fixedly connected to the side wall of the rotating shaft 433. A fourth sliding groove 413 is provided on the end surface of the fixing rod 41 away from the bottom wall of the tunnel along the width direction, and a first sliding block 435 is slidably connected in the fourth sliding groove 413. A seventh sliding groove 438 is provided on the end surface of the first sliding block 435 close to the gear 434, and a third lead screw 437 is rotatably connected in the seventh sliding groove 438. A locking block 436 is also slidably connected in the seventh sliding groove 438, and the locking block 436 is threadedly connected to the third lead screw 437.

[0039] When the stabilizing plate 54 is pressed against the side wall of the tunnel, the rotating shaft 433 is manually rotated, and the rotating shaft 433 drives the gear 434 to rotate, and the gear 434 drives the rack 431 to rotate, and the rack 431 drives the sliding rod 42 to slide out of the second sliding groove 411, and then the sliding rod 42 uses the second keel 2 and the baffle 3 to press the stabilizing plate 54 against the side wall of the tunnel. At this time, the third screw 437 is manually rotated, and the third screw 437 drives the locking block 436 to move to the groove on the gear 434, and then the first slider 435 is slid, and the first slider 435 drives the locking block 436 to be inserted into the groove of the gear 434, thereby preventing the gear 434 from rotating, thereby realizing the locking of the fixing rod 41 and the sliding rod 42, and thereby realizing the pressing of the stabilizing plate 54 against the side wall of the tunnel.

[0040] A plurality of screw holes 11 are provided on the end surfaces of the first keel 1 and the second keel 2 which are close to each other. The connecting assembly 45 includes a plurality of connecting plates 451, which are respectively fixedly connected to the end surfaces of the plurality of fixing rods 41 and the plurality of sliding rods 42 which are away from each other. A plurality of through holes 454 are provided on the end surfaces of the plurality of connecting plates 451 which are close to the baffle plate 3. The connecting assembly 45 also includes a plurality of fixing bolts 452, which respectively pass through the plurality of through holes 454 and are threadedly connected to the plurality of screw holes 11. A gasket 453 is sleeved on the plurality of fixing bolts 452, and the gasket 453 is located between the fixing bolts 452 and the connecting plate 451.

[0041] The setting of the connecting plate 451 and the fixing bolt 452 realizes the detachable connection between the fixing rod 41 and the first keel 1 and the sliding rod 42 and the second keel 2, which also facilitates the installation of the fixing rod 41 and the sliding rod 42. At the same time, the setting of the gasket 453 makes the fixation of the fixing rod 41 and the sliding rod 42 more stable.

[0042] refer to Figure 5 and Figure 6The fixing mechanism 6 includes a plurality of tapered rods 61, which are respectively fixedly connected to the first keel 1 and the second keel 2 near the bottom wall of the tunnel. An eighth slide groove 611 is provided inside the tapered rod 61. A rotating groove 613 and a plurality of ninth slide grooves 612 connected to the eighth slide groove 611 are also provided on the side wall of the tapered rod 61. The rotating groove 613 and the ninth slide groove 612 are respectively located at both ends of the tapered rod 61. The reinforcement component 62 includes a plurality of reinforced tapered rods 621, which are respectively slidably connected to the plurality of ninth slide grooves 612. A tapered block 625 is slidably connected to the eighth slide groove 611, and the side wall of the tapered block 625 abuts against the reinforced tapered rod 621. A second lead screw 624 is rotatably connected to the side walls at both ends of the eighth slide groove 611, and the second lead screw 624 is threadedly connected to the tapered block 625. A worm wheel 622 is fixedly connected to the side wall of the second lead screw 624, and a worm 623 is rotatably connected in the rotating groove 613, and the worm 623 is meshed with the worm wheel 622; limiting grooves 614 are provided on the side walls on both sides of the ninth slide groove 612, and a limiting block 631 is slidably connected in the limiting groove 614, and the limiting block 631 is fixedly connected to the reinforced tapered rod 621, and a second spring 632 is fixedly connected to the end surface of the limiting groove 614 away from the tapered block 625, and the end of the second spring 632 close to the tapered block 625 is fixedly connected to the limiting block 631.

[0043] When the conical rod 61 is inserted into the bottom wall of the tunnel, the worm 623 is manually rotated, and the worm 623 drives the second screw 624 to rotate through the worm gear 622, and the second screw 624 drives the conical block 625 to slide, and the conical block 625 drives the reinforced conical rod 621 to slide out of the ninth slide groove 612. At this time, the reinforced conical rod 621 compresses the second spring 632 through the limit block 631, thereby realizing the reinforcement of the conical rod 61, so that the fixation of the first keel 1 and the second keel 2 is more stable; when the conical rod 61 is pulled out, the worm 623 is manually rotated in the opposite direction, and the worm 623 drives the worm gear 622 to rotate in the opposite direction, and the worm gear 622 drives the second screw 624 to rotate in the opposite direction, and the second screw 624 drives the conical block 625 to slide in the opposite direction. At this time, the second spring 632 drives the reinforced conical rod 621 to slide into the ninth slide groove 612 through the limit block 631, thereby facilitating the removal of the conical rod 61.

[0044] The implementation principle of a movable retaining wall for supporting pipeline excavation in Example 1 of the present application is as follows: when supporting a tunnel, a crane places the assembled first keel 1 and baffle 3 and the second keel 2 and baffle 3 into the tunnel through a lifting ring 7 and inserts them into the bottom wall of the tunnel through a tapered rod 61, and then manually rotates the rotating shaft 433, the rotating shaft 433 drives the gear 434 to rotate, the gear 434 drives the rack 431 to slide, the rack 431 drives the sliding rod 42 to slide out of the second sliding groove 411, and then the sliding rod 433 is manually rotated. The second keel 2 and the baffle plate 3 are used to press the stabilizing plate 54 against the side wall of the tunnel. At this time, the third lead screw 437 is manually rotated, and the third lead screw 437 drives the locking block 436 to move to the groove on the gear 434. Then, the first slider 435 is slid, and the first slider 435 drives the locking block 436 to be inserted into the groove of the gear 434, thereby preventing the gear 434 from rotating, so that the fixing rod 41 and the sliding rod 42 are locked, and the stabilizing plate 54 is pressed against the side wall of the tunnel, thereby achieving the support of the tunnel.

[0045] Example 1 of the present application also discloses a construction method for pipeline excavation support.

[0046] A construction method for pipeline excavation support comprises the following steps: Step 1: Draw the excavation diagram according to the pipeline layout diagram and determine the excavation depth and width.

[0047] Step 2: According to the excavation diagram, select the appropriate first keel 1 and second keel 2, and use the fixing rod 41 and the sliding rod 42 to make the stabilizing plate 54 press against the two side walls of the tunnel.

[0048] Step 3: Carry out excavation and support in sections. After each section is excavated, the movable retaining wall is immediately lowered for support to ensure construction safety.

[0049] Step 4: Install or maintain the pipeline. After the pipeline is installed, use engineering machinery to pull out the movable retaining wall and backfill the earth in time.

[0050] Step 5: The pulled out movable retaining wall can be used to support the next section of the pipeline after simple maintenance.

[0051] Repeating the above steps can improve work efficiency and reduce project costs.

[0052] Embodiment 2: refer to Figure 7The difference between this embodiment and the first embodiment is that a fifth slide groove 414 is provided on the end surface of the fixed rod 41 away from the bottom wall of the tunnel along the length direction, the locking assembly 43 includes two second mounting plates 441, the two second mounting plates 441 are fixedly connected to the side walls of the fixed rod 41 in the length direction, the two second mounting plates 441 are connected to the second lead screw 624 for common rotation, and the end surface of the fixed rod 41 fixedly connected to the second mounting plate 441 is provided with a sixth slide groove 415 along the length direction, and the sixth slide groove 415 is slidably connected to the side wall of the fixed rod 41 in the length direction. There is a second slider 443, the second slider 443 is threadedly connected to the second lead screw 624, a first groove 446 is provided on the end surface of the second slider 443 away from the bottom wall of the groove, a rotating rod 444 is rotatably connected in the first groove 446, a third slider 445 is slidably connected in the fifth sliding groove 414, the third slider 445 is fixedly connected to the sliding rod 42, a second groove 447 is provided on the end surface of the third slider 445 away from the sliding rod 42, and one end of the rotating rod 444 away from the second slider 443 is clamped in the second groove 447.

[0053] When adjusting the sliding length of the sliding rod 42, first rotate the rotating rod 444 into the second groove 447, and then manually rotate the first screw 442, the first screw 442 drives the second slider 443 to slide, the second slider 443 drives the third slider 445 to slide through the rotating rod 444, and the third slider 445 drives the sliding rod 42 to slide out of the second slide groove 411 until the stabilizing plate 54 is pressed against the side wall of the tunnel, thereby improving the applicability of the movable retaining wall for pipeline excavation support.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A movable retaining wall for pipeline excavation support, characterized in that: The invention comprises a plurality of first keels (1) and a plurality of second keels (2), wherein a baffle plate (3) is fixedly connected to the plurality of first keels (1), and the baffle plate (3) is also fixedly connected to the plurality of second keels (2), a supporting mechanism (4) is installed on the first keel (1), and the supporting mechanism (4) is connected to the second keel (2), a fixing mechanism (6) is also installed on the first keel (1) and the second keel (2), and a stabilizing mechanism (5) for reducing the looseness of the side wall of the tunnel is installed on the baffle plate (3).

2. The movable retaining wall for pipeline excavation support according to claim 1, characterized in that: The stabilizing mechanism (5) comprises a fixed shaft (51), the fixed shaft (51) being fixedly connected to the end surfaces of the two baffles (3) which are away from each other, a first slide groove (511) being provided on the end surface of the fixed shaft (51) away from the baffle (3) along the length direction, a sliding shaft (52) being slidably connected in the first slide groove (511), an end of the sliding shaft (52) away from the baffle (3) being fixedly connected to a stabilizing plate (54), an end of the stabilizing plate (54) away from the sliding shaft (52) being in contact with the side wall of the tunnel, a first spring (53) being fixedly connected to the bottom wall of the first slide groove (511), an end of the first spring (53) away from the baffle (3) being fixedly connected to the sliding shaft (52).

3. The movable retaining wall for pipeline excavation support according to claim 2, characterized in that: The support mechanism (4) comprises a fixing rod (41), a connecting assembly (45) being mounted on the fixing rod (41), the fixing rod (41) being connected to the first keel (1) via the connecting assembly (45), a second sliding groove (411) being provided on the end surface of the fixing rod (41) away from the first keel (1) along the length direction, a sliding rod (42) being slidably connected in the second sliding groove (411), an end of the sliding rod (42) away from the first keel (1) being connected to the second keel (2) via the connecting assembly (45), and a locking assembly (43) for locking the fixing rod (41) and the sliding rod (42) being further mounted on the fixing rod (41).

4. The movable retaining wall for pipeline excavation support according to claim 3 is characterized in that: A third sliding groove (412) is provided on the end surface of the fixed rod (41) away from the bottom wall of the tunnel along the length direction. The locking assembly (43) includes a rack (431). The rack (431) is slidably connected in the third sliding groove (412) and is fixedly connected to the sliding rod (42). Two first mounting plates (432) are also fixedly connected to the end surface of the fixed rod (41) away from the bottom wall of the tunnel. A rotating shaft (433) is rotatably connected to the two first mounting plates (432). A gear (434) is fixedly connected to the rotating shaft (433). The gear (434) is connected to the rotating shaft (433). The rack (431) is meshed, and a fourth slide groove (413) is provided on the end surface of the fixed rod (41) on which the third slide groove (412) is provided along the width direction; a first slider (435) is slidably connected in the fourth slide groove (413); a seventh slide groove (438) is provided on the end surface of the first slider (435) close to the gear (434); a third lead screw (437) is rotatably connected in the seventh slide groove (438); a locking block (436) is also slidably connected in the seventh slide groove (438); and the locking block (436) is threadedly connected to the third lead screw (437).

5. The movable retaining wall for pipeline excavation support according to claim 3, characterized in that: A fifth slide groove (414) is provided on the end surface of the fixed rod (41) away from the bottom wall of the tunnel along the length direction, and a sixth slide groove (415) is provided on the side wall of the fixed rod (41) along the length direction. The locking assembly (43) comprises a second mounting plate (441), the second mounting plate (441) is fixedly connected to the side wall of the fixed rod (41), a first lead screw (442) is rotatably connected to the second mounting plate (441), a second slider (443) is slidably connected to the sixth slide groove (415), and the locking assembly (43) comprises a second mounting plate (441), the second mounting plate (441) is fixedly connected to the side wall of the fixed rod (41), a first lead screw (442) is rotatably connected to the second mounting plate (441), and a second slider (443) is slidably connected to the sixth slide groove (415). The second slider (443) is threadedly connected to the first lead screw (442); a first groove (446) is provided on the end surface of the second slider (443) away from the bottom wall of the tunnel; a rotating rod (444) is rotatably connected in the first groove (446); a third slider (445) is slidably connected in the fifth sliding groove (414); the third slider (445) is fixedly connected to the sliding rod (42); a second groove (447) is provided on the end surface of the third slider (445) away from the sliding rod (42).

6. The movable retaining wall for pipeline excavation support according to claim 3, characterized in that: The connection assembly (45) comprises two connection plates (451), the two connection plates (451) are respectively fixedly connected to the end surfaces of the fixing rod (41) and the sliding rod (42) which are away from each other, and a plurality of screw holes (11) are provided on the end surfaces of the first keel (1) and the second keel (2) which are close to each other. The connection assembly (45) further comprises a plurality of fixing bolts (452), the plurality of fixing bolts (452) respectively pass through the two connection plates (451) and are threadedly connected to the plurality of screw holes (11).

7. The movable retaining wall for pipeline excavation support according to claim 1, characterized in that: The fixing mechanism (6) comprises a plurality of tapered rods (61), and the plurality of tapered rods (61) are respectively fixedly connected to the first keel (1) and the second keel (2) close to the bottom wall of the tunnel.

8. The movable retaining wall for pipeline excavation support according to claim 7, characterized in that: An eighth slide groove (611) is formed inside the conical rod (61), a ninth slide groove (612) connected to the eighth slide groove (611) is formed on the side wall of the conical rod (61), a rotation groove (613) connected to the eighth slide groove (611) is also formed on the side wall of the conical rod (61), a reinforcement component (62) is installed on the conical rod (61), and the reinforcement component (62) includes a reinforcement conical rod (621) and the reinforcement conical rod (621) is slidably connected to the conical rod (621). The ninth slide groove (612) is connected to a second lead screw (624) rotatably in the eighth slide groove (611), a conical block (625) is also slidably connected in the eighth slide groove (611), the conical block (625) is threadedly connected to the second lead screw (624), a worm (623) is rotatably connected in the rotating groove (613), a worm wheel (622) is fixedly connected to the second lead screw (624), and the worm (623) is meshed with the worm wheel (622).

9. The movable retaining wall for pipeline excavation support according to claim 8, characterized in that: A limiting groove (614) is provided on the side wall of the ninth sliding groove (612); the reinforcing component (62) further comprises a limiting member (63); the limiting member (63) comprises a limiting block (631); the limiting block (631) is slidably connected in the limiting groove (614); the limiting block (631) is fixedly connected to the reinforcing conical rod (621); a second spring (632) is fixedly connected to the side wall of the limiting groove (614) away from the conical block (625); and one end of the second spring (632) close to the conical block (625) is fixedly connected to the limiting block (631).

10. A construction method for pipeline excavation support as claimed in claim 3, characterized in that: The following steps are involved: Step 1: Draw the excavation diagram according to the pipeline layout diagram and determine the excavation depth and width. Step 2: According to the excavation diagram, select a suitable first keel (1) and a second keel (2), and use a fixing rod (41) and a sliding rod (42) to make the stabilizing plate (54) press against the two side walls of the tunnel. Step 3: Carry out excavation and support in sections. After each section is excavated, the movable retaining wall is immediately lowered for support to ensure construction safety. Step 4: Install or maintain the pipeline. After the pipeline is installed, use engineering machinery to pull out the movable retaining wall and backfill the earth in time. Step 5: The pulled out movable retaining wall can be used to support the next section of the pipeline after simple maintenance.

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