Pipe-jacking construction structure of steel structure bidirectional pipe-jacking originating well

Abstract

The utility model discloses a pipe-jacking construction structure of a steel structure bidirectional pipe-jacking originating well, which comprises a concrete bottom plate arranged at the position of a well bottom, a well wall enclosure arranged at the position of a surrounding well wall, an in-well support arranged on the inner side of the well wall enclosure, and a counter-force frame arranged on the concrete bottom plate, the counter-force frame comprises two oppositely-arranged rear seat walls, the two rear seat walls are each provided with a jacking hole allowing the jacking pipe to penetrate through, the two rear seat walls are fixedly connected through supporting profile steel, and the space between the rear seat walls and the well wall fence is filled and reinforced through a compactly-filled retaining wall. The counter-force frame is constructed through the profile steel backseat wall and the supporting profile steel, hole reinforcement is conducted between the backseat wall on the two sides of the counter-force frame and the well wall fence through the rammed and filled retaining wall, the structure has the advantages of being high in construction efficiency, low in cost, short in construction period and capable of being turned over, posture adjustment can be conveniently achieved through the matching mode of the counter-force frame and the retaining wall, and the construction period is shortened. And the method has obvious advantages on angular bidirectional jacking operation.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking construction, in particular to a steel structure bidirectional pipe jacking starting well pipe jacking construction structure. Background Art

[0002] The key process of pipe jacking construction is the construction of the starting well. During the construction of the starting well, factors such as the reinforcement of the starting section soil and the stability, safety, and convenience of construction of the rear wall will have a great impact on the quality, safety, and construction period of the pipe jacking construction.

[0003] The reinforcement of the soil in the starting section is the basis for ensuring the smooth progress of the jacking construction. At present, the main method of grouting reinforcement is to achieve the reinforcement of the soil in the starting section. However, the grouting reinforcement operation process is complicated, the construction period is long, and the cost is high, which is not friendly to the construction period and cost control. The construction of the jacking starting well currently mainly adopts the structure of the concrete back wall. The concrete back wall has high stability and safety. However, its construction period is long (generally about 1 month), the process is many (including steel bar binding, formwork support, concrete pouring, concrete curing), the cost is high, it cannot be reused as a temporary measure (one-time measure structure), and it is not environmentally friendly, especially in the small rectangular enclosure of the site, which is not conducive to the angled two-way jacking adjustment. Utility Model Content

[0004] The utility model aims to provide a steel structure bidirectional jacking pipe launching well jacking pipe construction structure to solve the technical problems described in the background technology.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] A steel structure bidirectional jacking pipe starting shaft jacking pipe construction structure, including a concrete bottom plate arranged at the bottom of the shaft, a shaft wall enclosure arranged at the surrounding shaft walls and a shaft support arranged on the inner side of the shaft wall enclosure, and also includes a reaction frame arranged on the concrete bottom plate, the reaction frame includes two rear seat walls arranged opposite to each other, both of which are provided with jacking holes for the jacking pipe to pass through, the two are fixedly connected by supporting steel sections, and the rear seat wall and the shaft wall enclosure are filled and reinforced by a compacted retaining wall.

[0007] Preferably, the rear seat wall is assembled by a plurality of assembly modules, and the plurality of assembly modules are stacked in sequence from bottom to top, and two adjacent assembly modules are connected and fixed by assembly bolts, and at least one tension fixing bolt is provided on both sides of the rear seat wall, and the tension fixing bolt passes through the plurality of stacked assembly modules from top to bottom, and fastens and fixes all the assembly modules it passes through into a whole.

[0008] Preferably, the assembly module uses a steel frame made of H-shaped steel as its main body, and a number of stiffening ribs are welded and fixed at intervals in the belly of the steel frame. The outer edges of the stiffening ribs are flush with the edges of the wing plates of the steel frame, and the opening of the belly of the steel frame is closed by a sealing plate fixed by welding. The sealing plate and the belly of the steel frame are correspondingly provided with bolt holes and operation holes for installing assembly bolts and tension fixing bolts. The assembly module includes a non-standard section located within the horizontal distribution range of the jacking hole and a standard section located outside the horizontal distribution range of the jacking hole. The end of the non-standard section assembly module close to the jacking hole is cut into an arc section matching the corresponding segment jacking hole, and is sealed by welding a steel sleeve of the corresponding arc section, and corresponding bolt holes for installing a water stop ring are provided on the assembly modules around the jacking hole.

[0009] Preferably, the supporting steel sections include a plurality of horizontal supporting steel sections and a plurality of vertical supporting steel sections, the horizontal supporting steel sections are correspondingly arranged on both sides of the rear seat wall, each horizontal supporting steel section includes two sections, a main section and an adjustment section, the length of the main section is greater than the length of the adjustment section, the ends of the two sections that are away from each other are bolted and fixed to the corresponding rear seat wall by connecting bolts, and the ends of the two sections that are close to each other are tied and fixed by horizontal adjusting bolts, and the horizontal adjusting bolts can adjust the length of the horizontal supporting steel sections by adjusting the spacing between the main section and the adjustment section, and the vertical supporting steel sections are correspondingly arranged between two vertically adjacent horizontal supporting steel sections, the bottom end of the vertical supporting steel section is bolted and fixed to the horizontal supporting steel section below it by connecting bolts, and the top end is tied and fixed to the horizontal supporting steel section above it by vertical adjusting bolts, and the vertical adjusting bolts can adjust the spacing between the two horizontal supporting steel sections by adjusting the spacing between the vertical supporting steel section and the horizontal supporting steel section.

[0010] Preferably, the adjustment section is arranged on the rear wall close to the starting side of the pipeline jacking, and the vertical supporting steel is arranged at one end of the main section close to the adjustment section.

[0011] Preferably, the retaining wall is formed by filling and compacting the excavated original clay with cement, and the compaction degree of the retaining wall is not less than 90%.

[0012] Preferably, the shaft wall enclosure is a steel sheet pile, an underground continuous wall or a cast-in-place pile.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model constructs a reaction frame through a rear seat wall and supporting steel sections made of steel sections, and the rear seat walls on both sides of the reaction frame and the shaft wall enclosure are reinforced by rammed retaining walls. Compared with grouting reinforcement in a closed soil body, the construction site is open and visible, the reinforcement construction is more convenient and efficient, and the quality is controllable. Moreover, the reaction frame and the retaining wall support the shaft wall enclosure on both sides, which not only ensures the structural stability of the reaction frame and provides stable support for the jacking equipment, but also can be used as an internal support measure for the shaft wall enclosure to prevent the shaft wall enclosure from becoming unstable and overturning. It has the advantages of high construction efficiency, low cost, short construction period, and turnover. Moreover, the coordination between the reaction frame and the retaining wall can easily realize posture adjustment, which has obvious advantages for angled two-way jacking operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only schematic and do not limit the present invention, wherein:

[0015] Figure 1 It is a schematic diagram of the plan layout of the launching well involved in the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the starting well involved in the utility model;

[0017] Figure 3 It is a schematic diagram of the planar structure of the reaction frame involved in the utility model;

[0018] Figure 4 It is a schematic diagram of the vertical structure of the reaction frame involved in the utility model;

[0019] Figure 5 This is a schematic diagram of the elevation structure of the rear seat wall involved in the utility model;

[0020] Figure 6 It is a schematic diagram of the planar structure of the assembly module involved in the utility model;

[0021] Figure 7 It is a schematic diagram of the cross-sectional structure of the assembly module involved in the utility model along its long axis direction;

[0022] Figure 8 It is a schematic diagram of the cross-sectional structure of the assembly module involved in the utility model along the short axis direction thereof.

[0023] Figure numerals: 1. Starting shaft; 2. Concrete bottom plate; 3. Shaft wall enclosure; 4. Shaft support; 41. Support corbel; 42. Steel purlin; 43. Diagonal brace; 44. Stiffening plate; 5. Reaction frame; 51. Rear wall; 511. Assembly module; 5111. Steel frame; 5112. Stiffening rib; 5113. Closing plate; 512. Assembly bolts; 513. Tension fixing bolts; 52. Push into the opening; 53. Water stop ring; 54. Horizontal support steel; 541. Main section; 542. Adjustment section; 55. Vertical support steel; 56. Horizontal adjustment bolts; 57. Vertical adjustment bolts; 58. Connecting bolts; 6. Retaining wall; 7. Pipeline. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of a steel structure bidirectional jacking pipe launching well jacking pipe construction structure of the utility model will be described with reference to the accompanying drawings. The embodiments recorded herein are specific embodiments of the utility model, which are used to illustrate the concept of the utility model, are explanatory and exemplary, and should not be interpreted as limiting the implementation methods of the utility model and the scope of the utility model. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application, and these technical solutions include technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0025] In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "longitudinal", "vertical", "oblique" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the utility model and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structure of various components of the embodiments of the utility model, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention. Figure 1-8 , the preferred embodiments of the utility model are further described in detail:

[0028] Example 1

[0029] The utility model preferably provides a steel structure bidirectional jacking pipe starting shaft jacking pipe construction structure, including a concrete bottom plate 2 arranged at the bottom of the shaft, a shaft wall enclosure 3 arranged at the surrounding shaft walls, and a shaft support 4 arranged on the inner side of the shaft wall enclosure 3, and also includes a reaction frame 5 arranged on the concrete bottom plate 2, the reaction frame 5 includes two rear seat walls 51 arranged opposite to each other, and the two rear seat walls 51 are each provided with a jacking hole 52 for the jacking pipe to pass through, the two are fixedly connected by supporting steel sections, and the rear seat wall 51 and the shaft wall enclosure 3 are filled and reinforced by a retaining wall 6 that is compacted and filled. In this embodiment, the reaction frame 5 is an integral structure.

[0030] This embodiment also provides a corresponding construction method for the above-mentioned steel structure bidirectional pipe jacking starting well pipe jacking construction structure, including the following steps:

[0031] Step S1, processing and manufacturing the reaction frame 5, the rear seat wall 51 is welded by using ribbed I-beam or ribbed channel steel as the main body, and the two rear seat walls 51 are bolted or welded by horizontal support steel 54, and the horizontal support steel 54 can also be made of I-beam or channel steel;

[0032] Step S2, excavate the starting well 1, first construct the well wall enclosure 3, then excavate the starting well 1 foundation pit, and construct the well support 4 as a support measure while excavating, and excavate as the support is followed. After excavating to the designed depth, pour the concrete bottom plate 2. The well wall enclosure 3 and the well support 4 are structures that support the boundary of the foundation pit of the starting well 1 and ensure that the pit wall does not collapse after the excavation of the soil in the pit. It also plays a role in stopping water within the set depth range. The well wall enclosure 3 can adopt structural forms such as steel sheet piles, underground continuous walls or cast-in-place piles. In this embodiment, the starting well 1 has a depth of 10.7m, a length of 9.7m, and a width of 5.6m. Considering the construction period requirements, 15mS is adopted. P-U400×170 steel sheet pile support, the well support 4 specifically includes a steel purlin 42, the steel purlin 42 is placed on the support bracket 41, the support bracket 41 is welded and fixed on the steel sheet pile, the steel purlin 42 is reinforced by a diagonal brace 43, the steel purlin 42 adopts 400×400×20×10H steel, the diagonal brace 43 adopts 400×400×20×10H steel, and the steel sheet piles at the corners of the starting well 1 are reinforced by a welded and fixed stiffening plate 44. In this embodiment, before the excavation of the foundation pit of the starting well 1, an artificial excavation pit is first used. The exploration pit size is 11.7m long×7.6m wide×2m deep. Existing water supply pipes and communication cables were removed. Before the large-scale excavation of the starting well 1 foundation pit, steel sheet piles were first driven. 12m steel sheet piles were driven and 5m steel sheet piles were overlapped. After the steel sheet piles were driven, the starting well 1 foundation pit was excavated. Support was provided while excavating. A layer of steel purlin 42 was provided every 2m. Excavation was carried out while supporting. After excavation to a depth of 6.7m, a silt layer with a thickness of about 4m appeared. After excavation to a designed depth of 10.42m, a temporary water collection pit was set up. The foundation was treated according to the address (0.5m brick slag was used to replace the pit bottom). After the foundation treatment was completed, a 5cm concrete cushion layer was poured, and the steel bars were tied and the concrete bottom plate 2 was poured according to the drawings ( The concrete bottom plate 2 in sewage engineering can be used as the inspection well bottom plate, and the concrete bottom plate 2 in water supply engineering can be used as the valve well bottom plate). The size of the concrete bottom plate 2 is determined according to the top pipe structure diagram, and the thickness is not less than 20cm (the top surface elevation of the concrete bottom plate 2 needs to be determined comprehensively according to the designed top pipe elevation and the height of the rear seat wall 51). A sump of not less than 0.5W×0.5L×0.6H is set on both sides of the waistline of the concrete bottom plate 2, and a drainage submersible pump is set as a dewatering point in the pit. At the same time, in order to ensure the safety of the top pipe construction, it is also necessary to set up a water level gauge outside the pit, a water level gauge inside the pit, a foundation deformation monitoring device outside the pit, and a foundation deformation monitoring device inside the pit before the construction;

[0033] Step S3, installing the reaction frame 5, which is prefabricated on the ground and hoisted to the bottom of the starting well 1 by a gantry crane installed at the wellhead, and then installing the reaction frame 5 on the concrete bottom plate 2 and adjusting its position to ensure that the center line of the jacking hole 52 on the rear seat wall 51 on the starting side of the pipeline 7 coincides with the designed center line of the pipeline 7;

[0034] Step S4, blocking the top entry hole 52, using red bricks as a blocking material to build the top entry hole 52, using red bricks to tightly block the top entry holes 52 of the front and rear two rear seat walls 51 of the reaction frame 5, and using 1:2.5 cement mortar to further block the outer surface of the red bricks;

[0035] Step S5, tamping the retaining wall 6, backfilling the original clay excavated with 5% cement between the rear wall 51 and the shaft enclosure 3, and tamping it densely, the compaction degree of the retaining wall 6 is not less than 90%, when tamping to the height of the top hole 52, the part of the shaft enclosure 3 on the top route is cut and broken, and the cut position is backfilled and densely with 5% cement excavated original clay to reinforce the hole, when backfilling the retaining wall 6, tamping is performed layer by layer in a manner of 20 cm, after tamping to the height of the bottom surface of the top hole 52, the supporting steel sheet piles are cut layer by layer in a manner of 20 cm, and tamping is performed as they are cut, when tamping the retaining wall 6, it should be ensured that the front and rear walls are symmetrically tamped at the same time, the height difference of the filling on both sides shall not be higher than 40 cm, and the backfill height of the retaining wall 6 shall not be lower than 1.5 times the outer diameter of the pipeline 7;

[0036] Step S6, the jacking equipment and the water stop ring 53 are installed, the jacking pipe and the jacking iron are installed on the rear seat wall 51, and bolts are used to disperse the jacking force of the hydraulic jack. According to the design requirements, the track height is installed and adjusted on the concrete bottom plate 2, and the steel plate patches of different thicknesses are used to adjust the track height to the designed height and the expansion bolts are used to fix the track on the concrete bottom plate 2 to prevent movement. After that, the water stop ring 53 is installed at the jacking hole 52 of the rear seat wall 51 on the side of the hole. The water stop ring 53 is fixed to the rear seat wall 51 with bolts, and a rubber gasket is placed between the rear seat wall 51 and the water stop ring 53 to prevent leakage. After the installation of the water stop ring 53 is completed, a gantry crane is used to lift 4 200t rails at a time. The hydraulic jack is installed on the jacking iron bracket and fixed. Then, the main oil cylinder is started to debug the hydraulic jack. After the debugging is completed, the mud-water balance pipe jacking machine head is hoisted and placed 60 cm behind the first jacking hole 52. Then, the brickwork sealing layer of the jacking hole 2 is broken, and the machine head is pushed into the water stop ring 53 so that the jacking machine is close to the backfill soil inside the retaining wall 6, and then the jacking iron is hoisted and installed in place;

[0037] Step S7, pipe jacking construction, according to the pipe jacking construction operation manual, complete the jacking construction operation of the segment pipeline 7 corresponding to the current jacking direction of the current starting well 1 at one time;

[0038] Step S8, adjusting the jacking direction of the jacking equipment, removing the jacking pipe and auxiliary equipment such as the jacking machine head, jacking iron, hydraulic jack, mud pipe, etc. and hoisting them to the ground at one time, then demolishing the retaining wall 6 and hoisting the rammed fill to the ground, and then adjusting the posture of the reaction frame 5 by the gantry crane to adjust the jacking construction angle in the opposite direction, so that the center line of the jacking hole 52 on the rear seat wall 51 in the opposite direction coincides with the designed center line of the pipeline 7. When there is no angle in the two-way jacking construction, there is no need to adjust the posture of the reaction frame 5, and there is no need to perform demolition operations on the retaining wall 6;

[0039] Step S9, reverse direction jacking construction, repeat the corresponding process contents of steps S4 to S7 to complete the reverse direction pipeline 7 jacking construction operation.

[0040] Example 2

[0041] like Figure 1-4 As shown, another preferred steel structure bidirectional jacking starting well jacking construction structure of the utility model comprises a concrete bottom plate 2 arranged at the bottom of the well, a well wall enclosure 3 arranged at the surrounding well wall positions, and a well support 4 arranged inside the well wall enclosure 3, and also comprises a reaction frame 5 arranged on the concrete bottom plate 2, the reaction frame 5 comprises two rear seat walls 51 arranged opposite to each other, and both rear seat walls 51 are provided with a jacking hole 52 for the jacking pipe to pass through, and the two are fixedly connected by a supporting steel section, and the rear seat wall 51 and the well wall enclosure 3 are filled and reinforced by a retaining wall 6 which is compacted and filled;

[0042] Considering that the reaction frame 5 of the integral structure in Example 1 is relatively large in size and weight, a gantry crane with a higher lifting capacity is required, a larger starting shaft 1 is required, and the on-site operation and construction are more difficult, in order to carry out the pipe jacking construction more flexibly and reduce the construction difficulty, the reaction frame 5 is optimized and designed as a modular assembly form in this embodiment. The specific structural form of the reaction frame 5 is as follows:

[0043] like Figure 5-8As shown, the rear seat wall 51 is assembled by a plurality of assembly modules 511, and the plurality of assembly modules 511 are stacked in sequence from bottom to top, and two adjacent assembly modules 511 are connected and fixed by assembly bolts 512, and at least one tension fixing bolt 513 is arranged on both sides of the rear seat wall 51, and the tension fixing bolt 513 penetrates the plurality of stacked assembly modules 511 from top to bottom, and pulls and fixes all the assembly modules 511 penetrated by it into a whole, and the assembly module 511 is mainly composed of a steel frame 5111 made of H-shaped steel, and a plurality of stiffening ribs 5112 are welded and fixed at intervals in the abdominal cavity of the steel frame 5111, and the outer edges of the stiffening ribs 5112 are connected to the wing plates of the steel frame 5111 The edges of the steel frame 5111 are flush, and the belly opening of the steel frame 5111 is closed by a sealing plate 5113 fixed by welding. The sealing plate 5113 and the belly plate of the steel frame 5111 are correspondingly provided with bolt holes and operation holes for installing assembly bolts 512 and tension fixing bolts 513. The assembly module 511 includes a non-standard section located within the horizontal distribution range of the top entry hole 52 and a standard section located outside the horizontal distribution range of the top entry hole 52. The end of the non-standard section assembly module 511 close to the top entry hole 52 is cut into an arc section matching the corresponding segment top entry hole 52, and is sealed by welding the steel casing of the corresponding arc section, and the assembly modules 511 at the circumference of the top entry hole 52 are correspondingly provided with bolt holes for installing the water stop ring 53;

[0044] The support steel comprises a plurality of horizontal support steels 54 and a plurality of vertical support steels 55. The horizontal support steels 54 are correspondingly arranged on both sides of the rear seat wall 51. Each horizontal support steel 54 comprises a main section 541 and an adjustment section 542. The length of the main section 541 is greater than the length of the adjustment section 542. The ends of the two sections which are far from each other are bolted and fixed to the corresponding rear seat wall 51 by connecting bolts 58. The ends of the two sections which are close to each other are tied and fixed by horizontal adjustment bolts 56. The horizontal adjustment bolts 56 can be adjusted by adjusting the distance between the main section 541 and the adjustment section 542. The length of the horizontal support steel 54 is adjusted by the spacing method. The vertical support steel 55 is correspondingly arranged between two vertically adjacent horizontal support steels 54. The bottom end of the vertical support steel 55 is bolted and fixed to the horizontal support steel 54 at the position below it by a connecting bolt 58, and the top end is tied and fixed to the horizontal support steel 54 at the position above it by a vertical adjustment bolt 57. The vertical adjustment bolt 57 can adjust the spacing between the vertical support steel 55 and the horizontal support steel 54 to achieve the spacing between the two horizontal support steels 54. Among them, the assembly module 511 is The main body of the rear seat wall 51 needs to determine the specific size and number of the assembly module 511 according to the height and top force. The assembly bolts 512 and the tension fixing bolts 513 are used to fix the assembly module 511 so that the rear seat wall 51 forms an integral force. The horizontal support steel 54 and the vertical support steel 55 are used to connect and fix the front and rear rear seat walls 51 to prevent the rear seat wall 51 from tilting and becoming unstable during the splicing and subsequent construction process. The horizontal support steel 54 is optimized into a two-section structure, which can avoid the problem of difficulty in positioning when the size is consistent with the distance between the two rear seat walls 51 during the installation process. The horizontal adjustment bolts 56 and the vertical adjustment bolts 57 are set to adjust the positions of the horizontal support steel 54 and the vertical support steel 55, so that the reaction frame 5 is squared, that is, the horizontal adjustment bolts 56 are used to adjust the square to ensure that the rear wall 51 is perpendicular to the jacking direction and the jacking hole 52 is accurately positioned, and the vertical adjustment bolts 57 are used to adjust the setting height of the vertical support steel 55 for easy installation and disassembly. Moreover, the horizontal adjustment bolts 56 can also loosen the rear wall 51 by twisting itself during the process of demolishing the retaining wall 6, so as to reduce the difficulty of demolishing the retaining wall 6.

[0045] The adjustment section 542 is arranged on the rear seat wall 51 close to the starting side of the jacking of the pipeline 7 to better adjust the position of the rear seat wall 51 on the jacking side, ensuring that the center line of the jacking opening 52 coincides with the designed center line of the pipeline 7, and the vertical support steel 55 is arranged at one end of the main section 541 close to the adjustment section 542, in order to arrange the vertical support steel 55 at the relatively free end of the horizontal support steel 54 to reduce the difficulty of adjustment.

[0046] At the same time, this embodiment also provides a corresponding construction method for the above-mentioned steel structure bidirectional pipe jacking starting well pipe jacking construction structure, including the following steps:

[0047] Step S1, processing and manufacturing the reaction frame 5, using 400×400×20×20 H-shaped steel to process the assembly module 511, the width of the standard section assembly module 511 is 5m, the assembly bolts use M24 high-strength bolts, the tension fixing bolts 513 use M30 through-thread screws and matching nuts, the top hole 52 steel casing uses φ2200mm steel pipe, split welding, the material processing fee is 127,000 yuan in total, the specific steps are as follows,

[0048] Step S11, cutting the steel frame 5111, determining the module length according to the top force requirement, and cutting the H-shaped steel of 400×400×20×20 into several sections of the same length;

[0049] Step S12, welding stiffening ribs 5112 with a spacing of 400 mm inside the steel frame 511, the stiffening ribs 5112 are made of 10 mm thick steel plates, and the stiffening ribs 5112 are fully welded on both sides. After welding, ensure that the top surface of the stiffening ribs 5112 is flush with the flange of the steel frame 5111;

[0050] Step S13, welding the sealing plate 5113, laying 400mm wide and 10cm thick steel plates on both sides of the H-shaped steel opening, leveling and spot welding, and then full welding;

[0051] Step S14, cutting and reserving bolt holes and operation holes for installing the assembly bolts 512 on the steel sealing plate 5113, and welding nuts of the assembly bolts 512 in advance at the bolt holes corresponding to the assembly bolts 512;

[0052] Step S15, reserve Φ32 holes at 30 cm and 60 cm from the edge of both ends of the assembly module 511 as bolt holes for the tension fixing bolts 513;

[0053] Step S16, processing and manufacturing the horizontal support steel 54 and the vertical support steel 55, cutting the horizontal support steel 54 and the vertical support steel 55 according to the design size, both of which use 300×300×21×17 type H-shaped steel, and 400×400×10mm steel plates are welded at both ends of the H-shaped steel for setting the connecting bolts 58, the horizontal adjustment bolts 56 or the vertical adjustment bolts 57;

[0054] Step S17, processing the jacking hole 52, specifically includes the following steps:

[0055] Step S171, according to the outer diameter of the pipe 7, the steel casing of the jacking hole 52 is processed, the inner diameter of the steel casing is the outer wall size of the jacking machine plus 20mm, the thickness of the steel casing is 400mm, the steel casing is divided by the height contour of the assembly module 511 (400mm), and the corresponding contour is cut into corresponding arc segments;

[0056] Step S172, temporarily assembling the assembly modules 511 of the rear wall 51, and marking circles according to the height of the reserved top hole 52 and the outer diameter of the steel sleeve;

[0057] Step S173, cutting the standard segment assembly module 511 at the corresponding position along the marked arc line to form a non-standard segment assembly module 511, and welding and fixing the corresponding steel sleeve arc segment on the corresponding non-standard segment assembly module 511, ensuring that all welds are fully welded, and polishing;

[0058] Step S174, process the flange holes around the top hole 52, draw lines according to the flange plate of the water stop ring 53 of the top hole 52, and determine the position and size of the screw holes, process the bolt holes on the assembly module 511 at the corresponding position, and weld the corresponding nuts on the inner side of the bolt holes. The nuts need to fit tightly with the wing plates of the steel frame 5111 and be fully welded and fixed;

[0059] Step S2, excavate the starting well 1, first construct the well wall enclosure 3, then excavate the starting well 1 foundation pit, and construct the well support 4 as a support measure while excavating, and excavate as the support is followed. After excavating to the designed depth, pour the concrete bottom plate 2. The well wall enclosure 3 and the well support 4 are structures that support the boundary of the foundation pit of the starting well 1 and ensure that the pit wall does not collapse after the excavation of the soil in the pit. It also plays a role in stopping water within the set depth range. The well wall enclosure 3 can adopt structural forms such as steel sheet piles, underground continuous walls or cast-in-place piles. In this embodiment, the starting well 1 has a depth of 10.7m, a length of 9.7m, and a width of 5.6m. Considering the construction period requirements, 15mS is adopted. P-U400×170 steel sheet pile support, the well support 4 specifically includes a steel purlin 42, the steel purlin 42 is placed on the support bracket 41, the support bracket 41 is welded and fixed on the steel sheet pile, the steel purlin 42 is reinforced by a diagonal brace 43, the steel purlin 42 adopts 400×400×20×10H steel, the diagonal brace 43 adopts 400×400×20×10H steel, and the steel sheet piles at the corners of the starting well 1 are reinforced by a welded and fixed stiffening plate 44. In this embodiment, before the excavation of the foundation pit of the starting well 1, an artificial excavation pit is first used. The exploration pit size is 11.7m long×7.6m wide×2m deep. Existing water supply pipes and communication cables were removed. Before the large-scale excavation of the starting well 1 foundation pit, steel sheet piles were first driven. 12m steel sheet piles were driven and 5m steel sheet piles were overlapped. After the steel sheet piles were driven, the starting well 1 foundation pit was excavated. Support was provided while excavating. A layer of steel purlin 42 was provided every 2m. Excavation was carried out while supporting. After excavation to a depth of 6.7m, a silt layer with a thickness of about 4m appeared. After excavation to a designed depth of 10.42m, a temporary water collection pit was set up. The foundation was treated according to the address (0.5m brick slag was used to replace the pit bottom). After the foundation treatment was completed, a 5cm concrete cushion layer was poured, and the steel bars were tied and the concrete bottom plate 2 was poured according to the drawings ( The concrete bottom plate 2 in sewage engineering can be used as the inspection well bottom plate, and the concrete bottom plate 2 in water supply engineering can be used as the valve well bottom plate). The size of the concrete bottom plate 2 is determined according to the top pipe structure diagram, and the thickness is not less than 20cm (the top surface elevation of the concrete bottom plate 2 needs to be determined comprehensively according to the designed top pipe elevation and the height of the rear seat wall 51). A sump of not less than 0.5W×0.5L×0.6H is set on both sides of the waistline of the concrete bottom plate 2, and a drainage submersible pump is set as a dewatering point in the pit. At the same time, in order to ensure the safety of the top pipe construction, it is also necessary to set up a water level gauge outside the pit, a water level gauge inside the pit, a foundation deformation monitoring device outside the pit, and a foundation deformation monitoring device inside the pit before the construction;

[0060] Step S3, installing the reaction frame 5, installing the reaction frame 5 on the concrete base plate 2, and ensuring that the center line of the jacking hole 52 on the rear seat wall 51 on the starting side of the jacking of the pipeline 7 coincides with the designed center line of the pipeline 7. The specific steps are as follows:

[0061] Step S31, determining the design center line of the pipeline 7 and the installation position of the rear wall 51 according to the construction drawing and staking out in combination with the jacking direction;

[0062] Step S32, install the first-floor assembly module 511, the tension fixing bolts 513 and the first-floor horizontal support steel 54 at the bottom of the rear seat wall 51, and adjust the squareness through the horizontal adjustment bolts 56, and then tighten the connecting bolts 58 between the horizontal support steel 54 and the rear seat wall 51 in sequence. After the tightening is completed, adjust the squareness again through the horizontal adjustment bolts 56 to ensure that the diagonal lengths of the rectangular frame formed by the first-floor assembly module 511 and the first-floor horizontal support steel 54 are equal;

[0063] Step S33, assemble the standard section assembly module 511 and the non-standard section assembly module 511 in sequence, and tighten the assembly bolts 512 layer by layer to prevent tilting. During the installation process, the vertical support steel 55 and the horizontal support steel 54 are installed synchronously with the installation progress, and the horizontal adjustment bolts 56 and the vertical adjustment bolts 57 are used to adjust the alignment;

[0064] Step S4, blocking the top entry hole 52, using red bricks as a blocking material to build the top entry hole 52, using red bricks to tightly block the top entry holes 52 of the front and rear two rear seat walls 51 of the reaction frame 5, and using 1:2.5 cement mortar to further block the outer surface of the red bricks;

[0065] Step S5, tamping the retaining wall 6, backfilling the original clay excavated with 5% cement between the rear wall 51 and the shaft enclosure 3, and tamping and filling densely, the compaction degree of the retaining wall 6 is not less than 90%, and the compaction degree in this embodiment is controlled to be 95%. When tamping to the height of the top hole 52, the part of the shaft enclosure 3 on the top route is cut and broken, and the cut position is backfilled and compacted with 5% cement mixed with the original clay excavated to reinforce the hole. When backfilling the retaining wall 6, tamping is performed layer by layer in a manner of 20 cm per layer. After tamping to the height of the bottom surface of the top hole 52, the supporting steel sheet piles are cut and filled layer by layer in a manner of 20 cm per layer, and tamping is performed as the cutting is performed to prevent landslides. When tamping the retaining wall 6, it should be ensured that the front and rear walls are symmetrically tamped at the same time, the height difference of the filling on both sides shall not be higher than 40 cm, and the backfill height of the retaining wall 6 shall not be lower than 1.5 times the outer diameter of the pipeline 7;

[0066] Step S6, the jacking equipment and the water stop ring 53 are installed, the jacking pipe and the jacking iron are installed on the rear seat wall 51, and bolts are used to disperse the jacking force of the hydraulic jack. According to the design requirements, the track height is installed and adjusted on the concrete bottom plate 2, and the steel plate patches of different thicknesses are used to adjust the track height to the designed height and the expansion bolts are used to fix the track on the concrete bottom plate 2 to prevent movement. After that, the water stop ring 53 is installed at the jacking hole 52 of the rear seat wall 51 on the side of the hole. The water stop ring 53 is fixed to the rear seat wall 51 with bolts, and a rubber gasket is placed between the rear seat wall 51 and the water stop ring 53 to prevent leakage. After the installation of the water stop ring 53 is completed, a gantry crane is used to lift 4 200t rails at a time. The hydraulic jack is installed on the jacking iron bracket and fixed. Then, the main oil cylinder is started to debug the hydraulic jack. After the debugging is completed, the mud-water balance pipe jacking machine head is hoisted and placed 60 cm behind the first jacking hole 52. Then, the brickwork sealing layer of the jacking hole 2 is broken, and the machine head is pushed into the water stop ring 53 so that the jacking machine is close to the backfill soil inside the retaining wall 6, and then the jacking iron is hoisted and installed in place;

[0067] Step S7, pipe jacking construction, according to the pipe jacking construction operation manual, complete the jacking construction operation of the segment pipeline 7 corresponding to the current jacking direction of the current starting well 1 at one time;

[0068] Step S8, adjust the jacking direction of the jacking equipment, dismantle the jacking equipment and hoist it to the ground, demolish the retaining wall 6 and hoist the rammed earth to the ground, adjust the reaction frame 5 to adjust the construction angle of the jacking pipe in the opposite direction, so that the center line of the jacking hole 52 on the rear wall 51 in the opposite direction coincides with the designed center line of the pipeline 7. The specific steps are as follows:

[0069] Step S81, dismantle the jacking machine head, jacking iron, hydraulic jack, mud pipe and other jacking pipes and auxiliary equipment and hoist them to the ground at one time;

[0070] Step S82, adjust the horizontal adjustment bolt 56, loosen the retaining wall 6 rammed between the rear wall 51 and the well wall enclosure 3, demolish the retaining wall 6 and lift the fill to the ground, and simultaneously demolish the horizontal support steel 54 and the vertical support steel 55 of the rear wall 51 during the demolition of the retaining wall 6;

[0071] Step S83, reinstall the reaction frame 5 according to the corresponding process contents of step S31 to step S33, wherein the jacking hole 52 on the rear seat wall 51 on the side where the jacking has been completed needs to be correspondingly sleeved on the part of the pipeline 7 that has been jacked, so that the pipeline 7 on the side where the jacking has been completed extends into the starting well 1 through the jacking hole 52;

[0072] Step S9, reverse direction jacking construction, repeat the corresponding process contents of steps S4 to S7 to complete the reverse direction pipeline 7 jacking construction operation, the specific steps are as follows:

[0073] Step S91, blocking the jacking hole 52, using red bricks as a blocking material to build the jacking hole 52, using red bricks to tightly block the jacking hole 52 of the rear wall 51 on the side of the reaction frame 5 to be pushed in, and using 1:2.5 cement mortar to further block the outer surface of the red bricks;

[0074] Step S92, tamping the retaining wall 6, backfilling the original clay excavated with 5% cement between the rear wall 51 and the shaft enclosure 3, and tamping it densely, the compaction degree of the retaining wall 6 is not less than 90%, and the compaction degree in this embodiment is controlled to be 95%. When tamping to the height of the jacking hole 52, the part of the shaft enclosure 3 on the side to be jacked that is on the jacking route is cut and broken, and the original clay excavated with 5% cement is used to backfill the cut position densely to reinforce the hole. When backfilling the retaining wall 6, tamping is performed layer by layer in a manner of 20 cm per layer. After tamping to the height of the bottom surface of the jacking hole 52, the supporting steel sheet piles are cut layer by layer in a manner of 20 cm per layer, and tamping is performed as the cutting is performed to prevent landslides. When tamping the retaining wall 6, it should be ensured that the front and rear walls are symmetrically tamped at the same time, the height difference of the filling on both sides shall not be higher than 40 cm, and the backfill height of the retaining wall 6 shall not be lower than 1.5 times the outer diameter of the pipeline 7;

[0075] Step S93, reinstall the jacking equipment and the water stop ring 53, install the jacking equipment at the reaction frame 5, and install the water stop ring 53 at the jacking hole 52 of the rear wall 51 on the side to be jacked;

[0076] Step S94, pipe jacking construction, according to the pipe jacking construction operation manual, complete the reverse direction jacking construction operation of the corresponding segment pipeline 7 of the current starting well 1.

[0077] Example 2 has been actually applied to the bidirectional jacking work well construction of the test section of the jacking project of the new sewage trunk pipeline network of the XX project. During the construction of the test section, the use of the utility model saves 15 work shifts in the construction time of the first working well compared with the traditional concrete back wall, and saves about 10 working days in the adjustment and construction time of the working well when adjusting the jacking direction;

[0078] The total amount of reinforced concrete saved was 32m³, about RMB 78,960. It is estimated that the total cost of construction materials for the 26 working shafts of the project will be saved by about RMB 2.05 million, and the construction time of the working shafts will be saved by about 650 shifts.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure, comprising a concrete bottom plate (2) arranged at the well bottom, a well wall enclosure (3) arranged at the well wall positions around the well, and a well support (4) arranged inside the well wall enclosure (3), characterized in that: It also includes a reaction frame (5) arranged on the concrete bottom plate (2), the reaction frame (5) including two rear walls (51) arranged opposite to each other, each of the two rear walls (51) being provided with a jacking hole (52) for the jacking pipe to pass through, the two rear walls (51) being fixedly connected by a supporting steel section, and the rear walls (51) and the shaft wall enclosure (3) are filled and reinforced by a compacted retaining wall (6).

2. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure according to claim 1, characterized in that: The rear seat wall (51) is assembled from a plurality of assembly modules (511), the plurality of assembly modules (511) are stacked in sequence from bottom to top, two upper and lower adjacent assembly modules (511) are connected and fixed by assembly bolts (512), and at least one tension fixing bolt (513) is provided on both sides of the rear seat wall (51), the tension fixing bolt (513) penetrates the plurality of stacked assembly modules (511) from top to bottom, and pulls and fixes all the assembly modules (511) penetrated by the tension fixing bolt (513) into a whole.

3. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure according to claim 2, characterized in that: The assembly module (511) is based on a steel frame (5111) made of H-shaped steel. A plurality of stiffening ribs (5112) are welded and fixed at intervals in the abdominal cavity of the steel frame (5111). The outer edges of the stiffening ribs (5112) are flush with the edges of the wing plates of the steel frame (5111). The abdominal cavity opening of the steel frame (5111) is closed by a sealing plate (5113) fixed by welding. The sealing plate (5113) and the abdominal plate of the steel frame (5111) are provided with corresponding bolts for installing the assembly bolts (512) and the tension fixing bolts. The assembly module (511) includes a non-standard section located within the horizontal distribution range of the top entry hole (52) and a standard section located outside the horizontal distribution range of the top entry hole (52). One end of the non-standard section assembly module (511) close to the top entry hole (52) is cut into an arc section matching the corresponding segment top entry hole (52), and is sealed by welding a steel sleeve of the corresponding arc section. In addition, corresponding bolt holes for installing a water stop ring (53) are opened on the assembly modules (511) at the circumference of the top entry hole (52).

4. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure according to claim 1, characterized in that: The support steel comprises a plurality of horizontal support steels (54) and a plurality of vertical support steels (55). The horizontal support steels (54) are correspondingly arranged on both sides of the rear seat wall (51). Each horizontal support steel (54) comprises two sections, a main section (541) and an adjustment section (542). The length of the main section (541) is greater than the length of the adjustment section (542). The ends of the two sections that are far from each other are bolted and fixed to the corresponding rear seat wall (51) via a connecting bolt (58). The ends of the two sections that are close to each other are tied and fixed via a horizontal adjustment bolt (56). The horizontal adjustment bolt (56) can be adjusted by adjusting the main section (541) and the adjustment section (542). The length of the horizontal support steel (54) is adjusted by adjusting the spacing between the sections (542). The vertical support steel (55) is correspondingly arranged between two vertically adjacent horizontal support steels (54). The bottom end of the vertical support steel (55) is bolted and fixed to the horizontal support steel (54) below it by a connecting bolt (58), and the top end is tied and fixed to the horizontal support steel (54) above it by a vertical adjustment bolt (57). The vertical adjustment bolt (57) can adjust the spacing between the two horizontal support steels (54) by adjusting the spacing between the vertical support steel (55) and the horizontal support steel (54).

5. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure according to claim 4, characterized in that: The adjustment section (542) is arranged on the rear seat wall (51) close to the starting side of the jacking of the pipeline (7), and the vertical support steel (55) is arranged at one end of the main section (541) close to the adjustment section (542).

6. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure according to claim 1, characterized in that: The retaining wall (6) is formed by filling and compacting the excavated original clay with cement, and the compaction degree of the retaining wall (6) is not less than 90%.

7. A steel structure bidirectional pipe jacking starting well pipe jacking construction structure according to claim 1, characterized in that: The well wall enclosure (3) is a steel sheet pile, an underground continuous wall or a cast-in-place pile.

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