Foundation pit supporting device and construction method thereof

Abstract

The invention belongs to the technical field of foundation pit supporting construction, and provides a foundation pit supporting device and a construction method thereof. A foundation pit supporting device comprises gauge pile channel steel, a top beam, a waist beam, a guide enclosing purlin, a first component, a second component and a transverse support, the first component is installed on the gauge pile channel steel, and the top beam is connected with the gauge pile channel steel through the first component; the second component comprises a connecting component and a supporting component, the connecting component is used for connecting the top beam and the guide enclosing purlin, and the supporting component is used for connecting the top beam or the waist beam and the transverse support; the first components on the positioning pile channel steel on the two sides of the groove are connected through transverse supports, and the supporting components are connected through transverse supports; and vertical support channel steel is inserted between the top beam and the guide enclosing purlin and is inserted into the bottom of the groove from the outer side of the waist beam through a pile driver. The method solves the problem of connection between the channel steels, and has the advantages of simplicity in operation and high mounting and dismounting speed.

Description

Technical Field

[0001] The present invention belongs to the technical field of foundation pit support construction, and in particular, relates to a foundation pit support device and a use method thereof. Background Art

[0002] At present, channel steel supports are mostly welded to form an integral force-bearing structure. This connection method has the disadvantages of large welding workload, slow construction speed, great difficulty in demolition, long demolition time, etc., and requires special types of work such as electrical welding, cutting, and electricians. The current technical operation has no standardized equipment, no unified standards, and cannot perform standardized operations. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a foundation pit support device which uses channel steels to connect and form a support system as a foundation pit support device, thereby solving the connection problem between channel steels; secondly, a foundation pit support construction method is provided. The construction method is based on a unified construction procedure for driving and pulling tool piles, and uses special channel steel components to connect the channel steels into an integral frame, and form an integral support body, which has the advantages of simple operation and fast installation and dismantling speed.

[0004] The present invention adopts the following technical solution.

[0005] On the one hand, the present invention provides a foundation pit support device, comprising positioning pile channel steel, a crown beam, a waist beam, a guide purlin, a first component, a second component and a transverse support, wherein the positioning pile channel steel is installed with a first component, and the crown beam is connected to the positioning pile channel steel through the first component;

[0006] The second member includes a connecting member and a supporting member, wherein the connecting member is used to connect the crown beam and the guide purlin, and the supporting member is used to connect the crown beam or the waist beam with the transverse support;

[0007] The first components and the supporting components on the positioning pile channel steels on both sides of the groove are connected by transverse supports;

[0008] The vertical support channel steel is inserted between the crown beam and the guide purlin, and inserted into the bottom of the trench from the outside of the waist beam by a pile driver.

[0009] Further, the first component includes a frame, a crown beam clamping plate and a back support plate, the frame is located on the rib surface of the positioning pile channel steel, the two ends of the frame are connected to the crown beam clamping plate by a first fastening bolt and a second fastening bolt respectively, the number of the back support plates is 2, and the two back support plates are arranged in parallel on both sides of the positioning pile channel steel;

[0010] The two ends of the first back support plate and the second back support plate are connected by a third fastening bolt and a fourth fastening bolt respectively, and a through hole for the first fastening bolt to pass through is provided on the first back support plate. The back support plate is connected to the frame by the first fastening bolt, and the back support plate is perpendicular to the frame.

[0011] Furthermore, the crown beam is placed on the frame and fixed to the positioning pile channel steel through the crown beam clamping plate, and the crown beam and the positioning pile channel steel are vertically arranged.

[0012] Furthermore, the connecting member includes a first clamping plate and a first round steel wire, the first round steel wire is a C-shaped structure, the first round steel wire is connected to the first clamping plate, and is fixedly connected by a nut.

[0013] Furthermore, the supporting member includes a second clamping plate and a second round steel thread, the second round steel thread is a C-shaped structure, the second round steel thread is connected to the second clamping plate, and is fixedly connected by a nut; the supporting member is connected to the crown beam or the waist beam, and the second clamping plate is connected to the lateral support.

[0014] Furthermore, the legs at both ends of the transverse support are provided with adjustable top screws, and the transverse support is installed on the crown beam clamping plate of the first component or the second clamping plate of the supporting component.

[0015] Furthermore, the crown beam is arranged on a side of the positioning pile channel steel close to the inside of the groove, and the guide purlin is arranged on a side of the positioning pile channel steel close to the outside of the groove.

[0016] In another aspect, the present invention provides a construction method of a foundation pit support device, which is applied to a foundation pit support device and comprises the following steps:

[0017] Step 1: Positioning and laying out the lines

[0018] Position and lay out the foundation pit for the construction of foundation pit support devices. First, establish the control network of the entire site, then establish the control network of each sub-square array. Finally, measure and set the axis control points of each group. Each group is required to use two wooden piles to make control piles. Then mark the center point of each pile according to the control piles of each group.

[0019] Step 2: Trench excavation

[0020] According to the preset trench excavation width, dig the trench from one end to the other end, and the trench depth is ≤1.5 meters;

[0021] Step 3: Determine the length of the positioning pile channel

[0022] The length of the positioning pile channel steel = trench depth + soil depth + trench top height. The soil depth is determined according to the construction plan, and the height of the exposed channel steel on the trench is determined according to the construction plan, and the minimum is not less than 2 times the height of the crown beam;

[0023] Step 4: Positioning the crown beam and waist beam

[0024] Determine the position of the top beam: the top beam is in line with the ground, and the bottom is generally flush with the ground; determine the position of the waist beam: the bottom surface of the waist beam is ≤1.5 meters below the ground; fix the frame: the back support plate is located on the belly of the positioning pile channel steel, and the frame is located on the rib surface of the positioning pile channel steel. Tighten the fastening bolts to make the back support plate and the frame fit tightly to the positioning pile channel steel;

[0025] Step 5: Driving positioning pile channel steel

[0026] Lift the positioning pile channel steel with a pile driver, so that the ribs of the positioning pile channel steel face the groove, and symmetrically drive the positioning pile channel steel with the first component installed on both sides of one end of the groove, and symmetrically drive two positioning pile channel steels on both sides of the groove at a preset distance from the first positioning pile channel steel;

[0027] Step 6: Install the crown beam

[0028] Place the crown beam rib surface toward the groove, and place both ends simultaneously into the first member of the positioning pile channel steel located on one side of the groove, clamp the crown beam with the crown beam clamping plate, tighten the first fastening bolt and the second fastening bolt to fix the crown beam on the frame, so that the crown beam is close to the positioning channel steel;

[0029] Step 7: Fix the guide purlin and waist beam

[0030] The ribs of the guide purlin are facing the outside of the groove. The guide purlin is lifted and placed on the back support plate outside the positioning pile channel steel. The guide purlin is fixed to the crown beam with a connecting member. The fixing of the waist beam is the same as that of the crown beam. The waist beam is located below the crown beam, and the ribs of the waist beam face the groove. It is fixed to the frame through the crown beam clamping plate and the first fastening bolt and the second fastening bolt.

[0031] Step 8: Horizontal support installation

[0032] The lateral support legs with adjustable top screws are supported on the crown beam clamping plates of the first component located on both sides of the groove and tightened; after the lateral support of the crown beam and waist beam is completed, an overall support system is formed;

[0033] Step 9: Add vertical support channel steel

[0034] Use a pile driver to insert the vertical support channel steel from between the crown beam and the guide purlin, and insert it into the bottom of the groove from the outside of the waist beam to the depth designed in the construction plan;

[0035] Step 10: Add lateral support

[0036] Install the support structure at the position where the crown beam and waist beam need to be equipped with lateral support, support the lateral support leg with adjustable top screw on the second clamping plate of the support structure, and tighten it;

[0037] Step 11: Continue digging trenches

[0038] As the trench excavation depth increases, a first component can be added to any positioning pile channel steel, a waist beam can be added to the first component, and a transverse support can be added to the waist beam;

[0039] Step 12: Pipeline Laying

[0040] If the horizontal spacing of the transverse supports is less than the length of the pipeline to be laid, the corresponding transverse supports can be temporarily removed. However, before temporarily removing the transverse supports, one transverse support should be added at each end of the transverse supports to be removed according to the design requirements of the construction plan. After adding the transverse supports, the transverse supports that are in the way can be removed. After laying the pipeline, the removed transverse supports can be restored before the temporarily added transverse supports are removed.

[0041] Step Thirteen:

[0042] According to the principle of supporting first and then dismantling, and dismantling the latter support first, the lateral supports and corresponding components shall be gradually dismantled according to the height of the backfill soil; when the trench is backfilled to ≤1.5 meters, the entire support system can be dismantled.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1. Construction safety is easy to ensure

[0045] The device and its use method follow the principle of supporting before digging, ensuring that the support is completed before the trench is excavated, and that excavation or manual work can continue with the support.

[0046] 2. Save construction time

[0047] The device and its use method can first complete the assembly of the whole frame on the ground, or after completing the assembly of the frame in a shallow trench, use a pile driver to continue to complete the subsequent support work. Only 1 to 2 people are needed for cooperation, the construction speed is fast, and the construction period is shortened by more than 50%.

[0048] 3. Cost savings

[0049] The device and the method of use do not require welding or cutting operations, thereby effectively saving welding and cutting costs; using a pile driver, only 1 to 2 persons are required to cooperate, thereby effectively saving labor costs.

[0050] 4. Green and environmentally friendly

[0051] This device and its use method do not involve welding or cutting operations, and basically do not generate electricity, gas, etc. consumption; effectively reduce welding light pollution, cutting noise and dust pollution. The operation time of the pile driver is greatly shortened, and the fuel consumption of the pile driver is effectively reduced. Recyclable materials and components are used to effectively reduce material loss and be green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic plan view of a foundation pit supporting device provided by the present invention;

[0053] Figure 2 A schematic longitudinal section diagram of a foundation pit supporting device provided by the present invention;

[0054] Figure 3 A cross-sectional view of a foundation pit support device provided by the present invention Figure 1 ;

[0055] Figure 4 A cross-sectional view of a foundation pit support device provided by the present invention Figure 2 ;

[0056] Figure 5 A schematic diagram of the first component structure provided by the present invention;

[0057] Figure 6 This is a schematic diagram of the first round steel wire turning structure provided by the present invention.

[0058] In the figure: 1-positioning pile channel steel; 2-crown beam; 3-waist beam; 4-guide purlin; 5-first member; 51-frame; 52-crown beam clamping plate; 53-back support plate; 531-first back support plate; 532-second back support plate; 54-first fastening bolt; 55-second fastening bolt; 56-third fastening bolt; 57-fourth fastening bolt; 6-connecting member; 61-first clamping plate; 62-first round steel thread; 7-support member; 71-second clamping plate; 72-second round steel thread; 8-lateral support; 9-vertical support channel steel. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0060] like Figure 1-6 As shown, the present invention provides a foundation pit supporting device, including a positioning pile channel steel 1, a crown beam 2, a waist beam 3, a guide purlin 4, a first component 5, a second component, a transverse support 8 and a vertical supporting channel steel 9.

[0061] The first component 5 is installed on the positioning pile channel steel 1. The first component 5 includes a frame 51, a crown beam pressing plate 52 and a back support plate 53. The back support plate 53 is located on the belly of the channel steel, and the frame 51 is located on the rib surface of the channel steel. The two ends of the frame 51 are connected to the crown beam pressing plate 52 by the first fastening bolt 54 and the second fastening bolt 55 respectively. There are two back support plates 53, and the two back support plates 53 are arranged in parallel on both sides of the positioning pile channel steel 1. The two ends of the first back support plate 531 and the second back support plate 532 are connected by the third fastening bolt 56 and the fourth fastening bolt 57 respectively, and the first back support plate 531 is provided with a through hole for the first fastening bolt 54 to pass through. The back support plate 53 is connected to the frame 51 by the first fastening bolt 54, and the back support plate 53 is perpendicular to the frame 51. The crown beam 2 is placed on the frame 51 and fixed to the positioning pile channel steel 1 by the crown beam pressing plate 52, and the crown beam 2 is arranged perpendicular to the positioning pile channel steel 1.

[0062] The second component includes a connecting component 6 and a supporting component 7. The connecting component 6 includes a first clamping plate 61 and a first round steel thread 62. The first round steel thread 62 is a C-shaped structure. The first round steel thread 62 is connected to the first clamping plate 61 and fixedly connected by a nut. The supporting component 7 includes a second clamping plate 71 and a second round steel thread 72. The second round steel thread 72 is a C-shaped structure. The second round steel thread 72 is connected to the second clamping plate 71 and fixedly connected by a nut. The connecting component 7 is used to fix the guide purlin 4 and the crown beam 2. The supporting component 8 is connected to the crown beam 2 or the waist beam 3. The second clamping plate 72 is connected to the transverse support 8.

[0063] The legs at both ends of the transverse support 8 are provided with adjustable top screws, and the transverse support 8 is arranged on the crown beam 2 and the waist beam 3 located on both sides of the groove to play a supporting role.

[0064] A vertical support channel steel 9 is inserted between the crown beam 2 and the guide purlin 4, and is inserted into the bottom of the groove from the outside of the waist beam 3 by a pile driver to the depth designed in the construction plan.

[0065] The positioning pile channel steel 1 is arranged on both side walls of the groove and is perpendicular to the bottom wall of the groove. The positioning pile channel steel 1 is connected to the crown beam 2 through the first component 5. A guide purlin 4 is provided on the side of the positioning pile channel steel 1 away from the crown beam 2. The crown beam 2 and the guide purlin 4 are connected through a connecting component 7. The supporting component 8 is connected to the crown beam 2 or the waist beam 3. The support foot at one end of the transverse support 8 is connected to the crown beam clamping plate 52 or the second clamping plate 72 located on one side of the groove, and the support foot at the other end of the transverse support 8 is connected to the crown beam clamping plate 52 or the second clamping plate 72 located on the other side of the groove.

[0066] The present invention also provides a construction method of a foundation pit supporting device, comprising the following steps:

[0067] Step 1: Positioning and laying out the lines

[0068] Follow the principle of "from the whole to the part" to avoid the accumulation of layout errors. Position and lay out the foundation pit used for the construction of the foundation pit support device. First, establish the control network of the entire site, and then establish the control network of each sub-square array separately. Finally, measure and set the axis control points of each group, and require each group to use two wooden piles to make control piles. According to the control piles of each group, mark the center point of each pile. Note: There are many cases of long-distance direct measurement and positioning with a tape measure on site. This practice is prone to error accumulation, so it is not easy to use a tape measure to measure and position more than one group.

[0069] Step 2: Trench excavation

[0070] According to the preset trench excavation width, dig the trench from one end to the other, and the trench depth should be ≤1.5 meters.

[0071] Step 3: Determine the length of the positioning pile channel

[0072] The length of the positioning pile channel steel 1 = trench depth + soil penetration depth + trench upper height. The soil penetration depth is determined according to the construction plan, and the height of the exposed channel steel on the trench is determined according to the construction plan, and the minimum is not less than twice the height of the crown beam 2.

[0073] Step 4: Positioning the crown beam and waist beam

[0074] Determine the position of the crown beam: The crown beam 2 is in line with the ground, and the bottom is generally flush with the ground;

[0075] The waist beam position is determined: the bottom surface of waist beam 3 is ≤1.5 meters below the ground;

[0076] Fix the frame: the back support plate 53 is located on the belly of the positioning pile channel steel 1, and the frame 51 is located on the rib surface of the positioning pile channel steel 1. Tighten the fastening bolts to make the back support plate 53 and the frame 51 fit tightly to the positioning pile channel steel 1.

[0077] Step 5: Driving positioning pile channel steel

[0078] Taking a 6-meter-long crown beam as an example, use a pile driver to lift the positioning pile channel steel 1 so that the ribs of the positioning pile channel steel 1 face the groove, and symmetrically drive the positioning pile channel steel 1 with the first component 5 installed on both sides of one end of the groove. At a distance of 5.4 meters (center distance of the positioning pile channel steel) from the first positioning pile channel steel, two positioning pile channel steels 1 are symmetrically driven on both sides of the groove. The driving depth is subject to the construction plan.

[0079] Step 6: Install the crown beam

[0080] Place the rib surface of the crown beam 2 toward the groove, and place both ends simultaneously into the first component 5 located on one side of the groove to position the pile channel steel 1, clamp the crown beam 2 with the crown beam clamping plate 52, tighten the first fastening bolt 54 and the second fastening bolt 55 to fix the crown beam 2 on the frame 51, so that the crown beam 2 is close to the positioning pile channel steel 1.

[0081] Step 7: Fix the guide purlin and waist beam

[0082] The ribs of the guide purlin 4 face the outside of the groove, and the guide purlin 4 is lifted up and placed on the second back support plate 532 outside the positioning pile channel steel 1, and the guide purlin 4 is fixed to the crown beam 2 with the connecting member 6.

[0083] The fixing of the waist beam 3 is the same as that of the crown beam 2 . The waist beam 3 is located below the crown beam 2 , with its ribs facing the grooves. The waist beam 3 is fixed to the frame 51 by the crown beam clamping plate 52 and the first fastening bolts 54 and the second fastening bolts 55 .

[0084] Step 8: Horizontal support installation

[0085] The lateral support 8 with adjustable top screws is supported on the crown beam clamping plate 52 of the first component 5 located on both sides of the groove and tightened.

[0086] After the lateral support of the crown beam 2 and the waist beam 3 is completed, an overall support system is formed.

[0087] Step 9: Add vertical support channel steel

[0088] Determine the number of additional vertical support channel steels 9 according to the construction plan, use a pile driver to insert the vertical support channel steels 9 from between the crown beam 2 and the guide purlin 4, and insert them into the bottom of the groove from the outside of the waist beam 3 to the depth designed in the construction plan.

[0089] Step 10: Add lateral support

[0090] Install the support member 7 at the positions where the crown beam 2 and the waist beam 3 need to be provided with the transverse supports 8, support the legs of the transverse supports 8 with adjustable top screws on the second clamping plates 71 of the support member 7, and tighten them.

[0091] Step 11: Continue digging trenches

[0092] As the trench excavation depth increases, a first component 5 may be added to any positioning pile channel steel 1 , a waist beam 3 may be added to the first component 5 , and a transverse support 8 may be added to the waist beam 3 .

[0093] Step 12: Pipeline Laying

[0094] If the horizontal spacing of the transverse supports 8 is less than the length of the pipeline to be laid, the corresponding transverse supports 8 can be temporarily removed. However, before temporarily removing the transverse supports 8, one transverse support should be added at each end of the transverse support 8 to be removed according to the design requirements of the construction plan. After adding the transverse supports, the obstructing transverse supports 8 can be removed. After laying the pipeline, the removed transverse supports 8 can be restored, and then the temporarily added transverse supports can be removed.

[0095] Step Thirteen:

[0096] According to the principle of supporting first and dismantling later, and dismantling the later support first, the horizontal support 8 and corresponding components are gradually dismantled according to the height of the backfill soil. When the trench is backfilled to ≤1.5 meters, the entire support system can be dismantled.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A foundation pit support device, comprising positioning pile channel steel, a crown beam, a waist beam, a guide purlin, a first member, a second member and a transverse support, characterized in that: A first component is installed on the positioning pile channel steel, and the crown beam and the positioning pile channel steel are connected through the first component; The second member includes a connecting member and a supporting member, wherein the connecting member is used to connect the crown beam and the guide purlin, and the supporting member is used to connect the crown beam or the waist beam with the transverse support; The first components and the supporting components on the positioning pile channel steels on both sides of the groove are connected by transverse supports; The vertical support channel steel is inserted between the crown beam and the guide purlin, and inserted into the bottom of the trench from the outside of the waist beam by a pile driver.

2. A foundation pit supporting device according to claim 1, characterized in that: The first component includes a frame, a crown beam clamping plate and a back support plate. The frame is located on the rib surface of the positioning pile channel steel. The two ends of the frame are connected to the crown beam clamping plate by a first fastening bolt and a second fastening bolt respectively. The number of the back support plates is 2, and the two back support plates are arranged in parallel on both sides of the positioning pile channel steel. The two ends of the first back support plate and the second back support plate are connected by a third fastening bolt and a fourth fastening bolt respectively, and a through hole for the first fastening bolt to pass through is provided on the first back support plate. The back support plate is connected to the frame by the first fastening bolt, and the back support plate is perpendicular to the frame.

3. A foundation pit supporting device according to claim 2, characterized in that: The crown beam is placed on the frame and fixed on the positioning pile channel steel through the crown beam clamping plate, and the crown beam and the positioning pile channel steel are vertically arranged.

4. A foundation pit supporting device according to claim 3, characterized in that: The connecting member includes a first clamping plate and a first round steel wire, the first round steel wire is a C-shaped structure, the first round steel wire is connected to the first clamping plate, and is fixedly connected by a nut.

5. A foundation pit supporting device according to claim 2, characterized in that: The supporting member includes a second clamping plate and a second round steel thread, the second round steel thread is a C-shaped structure, the second round steel thread is connected to the second clamping plate, and is fixedly connected by a nut; the supporting member is connected to the crown beam or the waist beam, and the second clamping plate is connected to the lateral support.

6. A foundation pit supporting device according to claim 5, characterized in that: The legs at both ends of the transverse support are provided with adjustable top screws, and the transverse support is installed on the crown beam clamping plate of the first component or the second clamping plate of the supporting component.

7. A foundation pit supporting device according to claim 6, characterized in that: The crown beam is arranged on the side of the positioning pile channel steel close to the inside of the groove, and the guide purlin is arranged on the side of the positioning pile channel steel close to the outside of the groove.

8. A construction method of a foundation pit support device, applied to a foundation pit support device as claimed in any one of claims 1 to 7, comprising the following steps: Step 1: Positioning and laying out the lines Position and lay out the foundation pit for the construction of foundation pit support devices. First, establish the control network of the entire site, then establish the control network of each sub-square array. Finally, measure and set the axis control points of each group. Each group is required to use two wooden piles to make control piles. Then mark the center point of each pile according to the control piles of each group. Step 2: Trench excavation According to the preset trench excavation width, dig the trench from one end to the other end, and the trench depth is ≤1.5 meters; Step 3: Determine the length of the positioning pile channel The length of the positioning pile channel steel = trench depth + soil depth + trench top height. The soil depth is determined according to the construction plan, and the height of the exposed channel steel on the trench is determined according to the construction plan, and the minimum is not less than 2 times the height of the crown beam; Step 4: Positioning the crown beam and waist beam Determine the position of the top beam: the top beam is in line with the ground, and the bottom is generally flush with the ground; determine the position of the waist beam: the bottom surface of the waist beam is ≤1.5 meters below the ground; fix the frame: the back support plate is located on the belly of the positioning pile channel steel, and the frame is located on the rib surface of the positioning pile channel steel. Tighten the fastening bolts to make the back support plate and the frame fit tightly to the positioning pile channel steel; Step 5: Driving positioning pile channel steel Lift the positioning pile channel steel with a pile driver, so that the ribs of the positioning pile channel steel face the groove, and symmetrically drive the positioning pile channel steel with the first component installed on both sides of one end of the groove, and symmetrically drive two positioning pile channel steels on both sides of the groove at a preset distance from the first positioning pile channel steel; Step 6: Install the crown beam Place the crown beam rib surface toward the groove, and place both ends simultaneously into the first member of the positioning pile channel steel located on one side of the groove, clamp the crown beam with the crown beam clamping plate, tighten the first fastening bolt and the second fastening bolt to fix the crown beam on the frame, so that the crown beam is close to the positioning channel steel; Step 7: Fix the guide purlin and waist beam The ribs of the guide purlin are facing the outside of the groove. The guide purlin is lifted and placed on the back support plate outside the positioning pile channel steel. The guide purlin is fixed to the crown beam with a connecting member. The fixing of the waist beam is the same as that of the crown beam. The waist beam is located below the crown beam, and the ribs of the waist beam face the groove. It is fixed to the frame through the crown beam clamping plate and the first fastening bolt and the second fastening bolt. Step 8: Horizontal support installation The lateral support legs with adjustable top screws are supported on the crown beam clamping plates of the first component located on both sides of the groove and tightened; after the lateral support of the crown beam and waist beam is completed, an overall support system is formed; Step 9: Add vertical support channel steel Use a pile driver to insert the vertical support channel steel from between the crown beam and the guide purlin, and insert it into the bottom of the groove from the outside of the waist beam to the depth designed in the construction plan; Step 10: Add lateral support Install the support structure at the position where the crown beam and waist beam need to be equipped with lateral support, support the lateral support leg with adjustable top screw on the second clamping plate of the support structure, and tighten it; Step 11: Continue digging trenches As the trench excavation depth increases, a first component can be added to any positioning pile channel steel, a waist beam can be added to the first component, and a transverse support can be added to the waist beam; Step 12: Pipeline Laying If the horizontal spacing of the transverse supports is less than the length of the pipeline to be laid, the corresponding transverse supports can be temporarily removed. However, before temporarily removing the transverse supports, one transverse support should be added at each end of the transverse supports to be removed according to the design requirements of the construction plan. After adding the transverse supports, the transverse supports that are in the way can be removed. After laying the pipeline, the removed transverse supports can be restored before the temporarily added transverse supports are removed. Step Thirteen: According to the principle of supporting first and then dismantling, and dismantling the latter support first, the lateral supports and corresponding components shall be gradually dismantled according to the height of the backfill soil; when the trench is backfilled to ≤1.5 meters, the entire support system can be dismantled.

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