Integral translation disassembling method for negative ring reaction frame of subway station shield launching bracket

Abstract

The invention discloses a subway station shield launching bracket negative ring reaction frame integral translation disassembling method, which belongs to the technical field of tunnel engineering construction, and comprises the following steps: S10, preparation work before translation: S11, laying a steel plate along a translation route; s12, connecting bolts between the 0 ring and the-1 ring are removed, and the negative ring and the bracket are pushed backwards by 100 mm; s13, the bottom of the reaction frame is fixed to the bracket; s20, carrying out translation construction; S21, setting a vertex and a counter-force point of equipment; s211, force application vertexes of the bracket are arranged at the two ends of the bracket; s212, the first counter-force point is arranged on the side wall of the structure; s22, translation is conducted; S221, the surface of the steel plate is evenly coated with a layer of lubricating oil; s222, jacking iron is continuously mounted at the counter-force point and the rear end of the jack in the translation process until the jack is translated to a wellhead; and S30, dismantling. The bracket, the negative ring and the reaction frame are integrally pushed to a side wellhead, so that the operation safety and the working efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to a method for overall translation and disassembly of a negative ring reaction frame of a shield starting bracket of a subway station. Background Art

[0002] Removal of brackets, negative rings and reaction frames in traditional semi-enclosed spaces (reference Fig.15 ) is to manually use embedded lifting rings and hand winches in the tunnel, and electric vehicles are used for transportation and dismantling. Its work efficiency and safety factor are "low".

[0003] Specific removal method:

[0004] 1. Install the embedded hooks, each hook has a load of 5t;

[0005] 2. Install hand chain hoists on the embedded hooks, 4 5t hoists;

[0006] 3. Manually dismantle components one by one using hand chain hoists;

[0007] 4. Transport it to the hoisting wellhead by an electric vehicle and lift it out by a gantry crane.

[0008] This removal method has the following disadvantages:

[0009] 1. The operators use the embedded lifting rings and fall chains for dismantling, which is inefficient. At the same time, the reaction frame and bracket are large in size, and it is difficult to control their shaking or floating manually, which is prone to injuries.

[0010] 2. When the pipe segment is pulled out radially, there is a large shake. During the shake, the pipe segment swings back and forth under the action of inertia, which can easily cause objects to hit and cause injuries;

[0011] 3. Each segment weighs about 2.5 tons, and it is difficult to load it manually with a fall chain, which leads to low construction efficiency. Due to the difficulty in operation during loading, the segments are not placed properly and firmly, which makes it easy for the segments to fall during transportation, causing injuries or damage to facilities, and there is also a risk of injury. Summary of the invention

[0012] In order to solve the above problems, the present invention adopts the following technical solutions:

[0013] A method for overall translational disassembly of a negative ring reaction frame of a shield starting bracket of a subway station comprises the following steps:

[0014] S10. Preparation before translation

[0015] S11. Lay steel plates along the translation route and fix no less than 4 round steel bars on each steel plate;

[0016] S12. Remove the connecting bolts between the 0 ring and the -1 ring, and push the negative ring and bracket back 100mm;

[0017] S13, reaction frame fixing

[0018] The bottom of the reaction frame is fixed on the bracket, and the upper part of the reaction frame is fixed by a fall chain and a steel wire rope in an oblique manner; the lower part of the reaction frame is welded and connected to the bracket crossbeam with a steel plate strip;

[0019] S20, translation construction

[0020] S21. Equipment vertex and reaction point settings

[0021] S211, the force application vertices of the bracket are set at both ends of the bracket, wherein the vertices are set 2m-2.5m inward from the ends of the bracket, the distance between the two vertices is 5m-6m, and the vertices are fixed on the bottom crossbeam of the bracket;

[0022] S212, the first reaction point is set on the side wall of the structure;

[0023] S22, translation

[0024] S221. Apply a layer of lubricating oil evenly on the surface of the steel plate to reduce the friction between the steel plates during translation and enable rapid pushing;

[0025] S222, during the translation process, the top iron is continuously installed between the reaction point and the rear end of the jack. When the middle top iron exceeds 2m, the reaction point is moved forward. The above actions are continuously repeated in a cycle during the translation process until the wellhead is translated;

[0026] S30, Demolition

[0027] After the negative ring, bracket and reaction frame are moved horizontally to the wellhead, they are dismantled at the wellhead using a crane.

[0028] Furthermore, in step S11, the steel plates laid along the translation route utilize the bottoming steel plates used during the original translation of the shield machine, and no preparatory work is required.

[0029] Furthermore, in step S222, the negative ring segments and reaction frames on the bracket are pushed to the side lifting wellhead by hydraulic jacks, and the reaction points during the advancement are fixed on the bottom steel plate. The reaction points are replaced every time a section is pushed forward, and the cycle is repeated until the wellhead is dismantled.

[0030] Furthermore, in step S11, 20mm steel plates are laid along the translation route, and the steel plates are quickly welded with a two-piece welding machine. At the same time, no less than 4 A60mm round steels are fixedly installed on each steel plate, and the insertion depth is ≥300mm.

[0031] Furthermore, in step S10, a steel horse stool is used for support in the wastewater pool. The horse stool material is HW200x200a steel. The horse stool is provided with two columns for support, and the upper edge of the horse stool is consistent with the elevation of the structural plate.

[0032] Further, in step S211, the vertex is set 2.06 m inward from the end of the bracket, and the distance between the two vertices is 5.88 m.

[0033] Furthermore, in step S221, the lubricating oil evenly applied on the surface of the steel plate needs to be applied along the route during translation.

[0034] Beneficial effects:

[0035] The present invention solves the problem of manual dismantling of brackets, negative rings and reaction frames in a tunnel. The brackets, negative rings and reaction frames are pushed as a whole to the side wellhead by utilizing the original shield machine translation materials, thereby directly reducing the risk of manual dismantling to a minimum. The equipment is used for dismantling, thereby improving the safety of operation and work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 To translate the flow chart;

[0037] Figure 2 It is a schematic diagram of the bottom translation steel plate;

[0038] Figure 3 This is a detailed drawing of the steel plate fixings;

[0039] Figure 4 It is a schematic diagram of the weld between steel plates;

[0040] Figure 5 It is a schematic diagram of the negative ring and the bracket moving backward;

[0041] Figure 6 This is a schematic diagram of fixing the bottom of the reaction frame;

[0042] Figure 7 is a schematic diagram of the bracket vertex;

[0043] Figure 8 This is a schematic diagram of the installation of the top iron;

[0044] Fig. 9 This is the first schematic diagram;

[0045] Fig.10 The bracket, negative ring and reaction frame are moved horizontally as a whole to the wastewater pump room;

[0046] Fig.11 The bracket, negative ring and reaction frame are translated to the wellhead as a whole;

[0047] Fig.12 This is a schematic diagram of the negative ring lifting and removal;

[0048] Fig.13 This is a schematic diagram of the reaction frame lifting and dismantling;

[0049] Fig.14 This is a schematic diagram of the bracket lifting and dismantling;

[0050] Fig.15 Structural diagram showing the need to remove the bracket, negative ring and reaction frame for a semi-enclosed space. DETAILED DESCRIPTION

[0051] Example 1

[0052] This embodiment is explained by taking the removal of the starting bracket, reaction frame and negative ring of the right-line shield machine between Xiamen University Nanmen Station and Xiamen University Baicheng Station as an example, and the translation distance is 11.6m.

[0053] refer to Figure 1 - Fig.14 A method for disassembling the negative ring reaction frame of a subway station shield starting bracket as a whole, comprising the following steps:

[0054] S10. Preparation before translation

[0055] S11. Lay steel plates along the translation route and fix no less than 4 round steel bars on each steel plate;

[0056] Among them, the steel plates laid along the translation route utilize the bottom steel plates used during the original translation of the shield machine. There is no need for preliminary preparation work, and the operation efficiency is high.

[0057] In this embodiment, a steel horse stool is used for support in the wastewater pool. The horse stool material is HW200x200a steel. The horse stool is supported by two columns. The upper edge of the horse stool is consistent with the elevation of the structural plate, and its strength and rigidity meet the requirements.

[0058] In this embodiment, 20mm steel plates are laid along the translation route, that is, 20mm steel plates are laid under the starting frame as a base, and the steel plates are quickly welded by a two-guard welding machine, and the length of each weld is not less than 1m; at the same time, no less than 4 A60mm round steels are fixedly installed on each steel plate, and the insertion depth is ≥300mm.

[0059] S12. Remove the connecting bolts between the 0 ring and the -1 ring. If it is difficult to pull out during the removal process, use a hammer and a gun rod to assist in the removal. Push the negative ring and bracket back 100mm.

[0060] S13, reaction frame fixing

[0061] The bottom of the reaction frame is fixed on the bracket, and the upper part of the reaction frame is fixed by a fall chain and a steel wire rope in an oblique manner; the lower part of the reaction frame is welded and connected to the bracket crossbeam with a steel plate strip;

[0062] S20, translation construction

[0063] S21. Equipment vertex and reaction point settings

[0064] In this implementation, the overall translation weight required is approximately: 20+13.5*7+15≈129.5t;

[0065] Thrust calculation

[0066] The friction coefficient between the steel plates is 0.5, and the friction coefficient after applying lubricating oil is 0.3. The theoretical thrust required for translation is calculated as follows:

[0067] 129.5*0.3=38.85t, the dynamic load coefficient is 1.1, that is, the deadweight in motion is

[0068] 38.85*1.1=42.735t.

[0069] Hydraulic jack selection

[0070] According to theoretical calculations, the weight of the horizontal shift is about 42.735t. The choice of thrust is mainly considered to be the maximum thrust required to start jacking. Therefore, two 100t hydraulic jacks are selected to meet the requirements of the horizontal shift construction.

[0071] The specific steps are as follows:

[0072] S211, the force application vertices of the bracket are set at both ends of the bracket, wherein the vertices are set 2m-2.5m inward from the ends of the bracket, the distance between the two vertices is 5m-6m, and the vertices are fixed on the bottom crossbeam of the bracket;

[0073] In this embodiment, the apex is arranged 2.06 m inward from the end of the bracket, and the distance between the two apex is 5.88 m.

[0074] S212, the first reaction point is set on the side wall of the structure;

[0075] S22, translation

[0076] S221. Apply a layer of lubricating oil evenly on the surface of the steel plate to reduce the friction between the steel plates during translation and enable rapid pushing;

[0077] In this embodiment, the lubricating oil evenly applied on the surface of the steel plate needs to be applied along the route during translation.

[0078] S222, during the translation process, the top iron is continuously installed between the reaction point and the rear end of the jack. When the middle top iron exceeds 2m, the reaction point is moved forward. The above actions are continuously repeated in a cycle during the translation process until the wellhead is translated;

[0079] In this embodiment, the negative ring segments and reaction frames on the bracket are pushed to the side lifting wellhead by hydraulic jacks. The reaction points during the advancement are fixed on the bottom steel plate. The reaction points are replaced every time a section is pushed forward, and the cycle is repeated until the wellhead is demolished.

[0080] S30, Demolition

[0081] After the negative ring, bracket and reaction frame are moved horizontally to the wellhead, they are dismantled at the wellhead using a truck crane.

[0082] Economic benefits of using the demolition solution provided by the present invention

[0083] 1. Promotion and application: This demolition method was applied in the first work area of ​​the southern extension of Xiamen Line 3. During the entire translation process, it fully demonstrated the advantages of innovation in engineering entities and solved the problem of manual demolition of brackets, negative rings and reaction frames in the tunnel. By using the original shield machine translation materials to push the brackets, negative rings and reaction frames to the side wellhead as a whole, the risk of manual demolition was directly reduced to a minimum. The use of equipment for demolition improved the safety of operations and work efficiency.

[0084] 2. Economic benefits:

[0085] Existing demolition plan: 30 workers, salary 350 yuan / person / day, construction period 8 days, labor cost = 30*350*8 = 84,000 yuan; the rental fee of self-owned equipment electric vehicle and gantry crane is calculated as 5,000*8 = 40,000 yuan, totaling 84,000+40,000 = 124,000 yuan.

[0086] The translational demolition solution provided by the present invention is applied: 20 workers, salary 350 yuan / person / day, construction period 4 days, labor cost = 20*350*4 = 28,000 yuan; equipment rental fee: 2,000 yuan / shift, a total of 6 shifts, 2,000*6 = 12,000 yuan, a total of 28,000+12,000 = 40,000 yuan.

[0087] Under this working condition, removing the bracket, negative ring and reaction frame can save 124,000-40,000=84,000 yuan.

[0088] 3. Social benefits: Under this working condition, the removal of brackets, negative rings and reaction frames increased the removal efficiency by 200% compared with the previous ones. The entire removal process had a fast construction progress and controlled safety and quality. Therefore, it was well received and recognized by the relevant project managers and department personnel of Xiamen Construction Branch.

[0089] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for disassembling the negative ring reaction frame of the shield starting bracket of a subway station, characterized in that: The following steps are involved: S10. Preparation before translation S11. Lay steel plates along the translation route and fix no less than 4 round steel bars on each steel plate; S12. Remove the connecting bolts between the 0 ring and the -1 ring, and push the negative ring and bracket back 100mm; S13, reaction frame fixing The bottom of the reaction frame is fixed on the bracket, and the upper part of the reaction frame is fixed by a fall chain and a steel wire rope in an oblique manner; the lower part of the reaction frame is welded and connected to the bracket crossbeam with a steel plate strip; S20, translation construction S21. Equipment vertex and reaction point settings S211, the force application vertices of the bracket are set at both ends of the bracket, wherein the vertices are set 2m-2.5m inward from the ends of the bracket, the distance between the two vertices is 5m-6m, and the vertices are fixed on the bottom crossbeam of the bracket; S212, the first reaction point is set on the side wall of the structure; S22, translation S221. Apply a layer of lubricating oil evenly on the surface of the steel plate to reduce the friction between the steel plates during translation and enable rapid pushing; S222, during the translation process, the top iron is continuously installed between the reaction point and the rear end of the jack. When the middle top iron exceeds 2m, the reaction point is moved forward. The above actions are continuously repeated in a cycle during the translation process until the wellhead is translated; S30, Demolition After the negative ring, bracket and reaction frame are moved horizontally to the wellhead, they are dismantled at the wellhead using a crane.

2. The method for disassembling the negative ring reaction frame of the subway station shield starting bracket according to claim 1 is characterized in that: In step S11, the steel plates laid along the translation route utilize the bottom steel plates used during the original translation of the shield machine, and no preparatory work is required.

3. The method for disassembling the negative ring reaction frame of the subway station shield starting bracket according to claim 1 is characterized in that: In step S222, the negative ring segments and reaction frames on the bracket are pushed to the side lifting wellhead by hydraulic jacks. The reaction points during the advancement are fixed on the bottom steel plate. The reaction points are replaced every time a section is pushed forward, and the cycle is repeated until the wellhead is dismantled.

4. The method for disassembling the negative ring reaction frame of the subway station shield starting bracket according to claim 1 is characterized in that: In step S11, 20mm steel plates are laid along the translation route, and the steel plates are quickly welded using a two-way welding machine. At the same time, no less than 4 A60mm round steels are fixedly installed on each steel plate, with an insertion depth of ≥300mm.

5. The method for disassembling the negative ring reaction frame of the subway station shield starting bracket according to claim 1 is characterized in that: In step S10, a steel horse stool is used for support in the wastewater pool. The horse stool is made of HW200x200a steel. The horse stool is supported by two columns, and the upper edge of the horse stool is consistent with the elevation of the structural plate.

6. The method for disassembling the negative ring reaction frame of the shield starting bracket of a subway station according to claim 1 is characterized in that: In step S211, the vertex is set 2.06m inward from the end of the bracket, and the distance between the two vertices is 5.88m.

7. The method for disassembling the negative ring reaction frame of the subway station shield starting bracket according to claim 1 is characterized in that: In step S221, the lubricating oil evenly applied on the surface of the steel plate needs to be applied along the route during translation.

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