CN222184765U - Construction structure of steel-structure bidirectional jacking pipe starting well top pipe - Google Patents

Abstract

The utility model discloses a steel structure bi-directional pipe jacking construction structure of an originating well, which comprises a concrete bottom plate arranged at a bottom hole position, a well wall surrounding baffle arranged at the surrounding well wall position, an in-well support arranged at the inner side of the well wall surrounding baffle, and a reaction frame arranged on the concrete bottom plate, wherein the reaction frame comprises two opposite backseat walls, jacking holes for the pipe jacking to pass through are formed in the two backseat walls, the two backseat walls are fixedly connected through supporting section steel, and a retaining wall filled and reinforced through tamping is arranged between the backseat walls and the well wall surrounding baffle. The utility model constructs a reaction frame through the profile steel back seat wall and the supporting profile steel, and the back seat walls on two sides of the reaction frame are reinforced with the wall of the well by the rammed retaining wall, so that the utility model has the advantages of high construction efficiency, low cost, short construction period and turnover, and the cooperation mode of the reaction frame and the retaining wall can conveniently realize posture adjustment, thereby having obvious advantages for the angled bidirectional jacking operation.

Description

Construction structure of steel-structure bidirectional jacking pipe starting well top pipe

Technical Field

The utility model relates to the technical field of pipe jacking construction, in particular to a steel structure bidirectional pipe jacking starting well top pipe construction structure.

Background

The key working procedures of pipe jacking construction are construction of an originating well, and factors such as soil reinforcement of an originating section, stability, safety, convenience in construction and the like of a rear seat wall in the construction of the originating well can have great influence on pipe jacking construction quality, safety and construction period.

The soil body reinforcement of the originating section is a foundation for ensuring smooth proceeding of pipe jacking construction, and the soil body reinforcement of the originating section is mainly realized by adopting a grouting reinforcement mode at present, however, the grouting reinforcement operation procedure is complex, the construction period is longer, the manufacturing cost is higher, and the construction period and the cost control are not friendly. The construction of the pipe jacking starting well mainly adopts the structural form of a concrete back wall at present, and the concrete back wall has higher stability and safety, but has the advantages of long construction period (generally about 1 month), multiple working procedures (including steel bar binding, formwork supporting, concrete pouring and concrete curing), high cost, unrepeatable use as a temporary measure (disposable measure structure), environmental protection, and in particular adverse angle bidirectional jacking adjustment in a rectangular enclosure with smaller field.

Disclosure of utility model

The utility model aims to provide a steel structure bidirectional pipe-jacking starting well pipe-jacking construction structure, which aims to solve the technical problems in the background technology.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

The utility model provides a two-way push pipe of well push pipe construction structures that originates of steel construction, includes to set up in the concrete bottom plate of bottom hole position, set up in the wall of a well of wall position all around enclose keep off and set up in the wall of a well enclose keep off inboard in the well support, still including setting up the reaction frame on concrete bottom plate, the reaction frame includes two back seat walls of setting relatively, and two back seat walls all set up the top entrance to a cave that supplies the push pipe to pass, link to each other through supporting shaped steel is fixed between the two, and the back seat wall encloses and fills the reinforcement through the retaining wall packing of ramming between keeping off with the wall of a well.

Preferably, the back seat wall is formed by assembling a plurality of assembling modules, the assembling modules are sequentially stacked from bottom to top, two adjacent assembling modules are fixedly connected through assembling bolts, at least one split fixing bolt is arranged on two sides of the back seat wall, the split fixing bolts penetrate through the assembling modules stacked together from top to bottom, and all the penetrated assembling modules are tied and fixed into a whole.

Preferably, the assembly module takes a section steel skeleton made of H-shaped steel as a main body, a plurality of stiffening ribs are welded and fixed in the section steel skeleton abdominal cavity at intervals, the outer edges of the stiffening ribs are flush with the edges of wing plates of the section steel skeleton, and the abdominal cavity opening of the section steel skeleton is closed by a sealing plate fixed by welding, bolt penetrating holes and operation holes for installing assembly bolts and opposite pulling fixing bolts are correspondingly formed in webs of the sealing plate and the section steel skeleton, the assembly module comprises a non-standard section positioned in the horizontal distribution range of the jacking hole and a standard section positioned outside the horizontal distribution range of the jacking hole, one end, close to the jacking hole, of the non-standard section assembly module is cut into an arc section matched with the jacking hole of the corresponding section, and a steel sleeve seal of the arc section is welded, and bolt penetrating holes for installing a water stop ring are correspondingly formed in the assembly module at the circumferential position of the jacking hole.

Preferably, the support section steel comprises a plurality of horizontal support section steel and a plurality of vertical support section steel, the horizontal support section steel corresponds to be arranged on two sides of the back seat wall, each horizontal support section steel comprises a main body section and two sections of adjusting sections, the length of the main body section is larger than that of the adjusting sections, one ends, which are far away from each other, of the main body section steel are bolted and fixed with the corresponding back seat wall through connecting bolts, one ends, which are close to each other, of the main body section steel are tied and fixed through the horizontal adjusting bolts, the horizontal adjusting bolts can be used for adjusting the length of the horizontal support section steel in a mode of adjusting the spacing between the main body section steel and the adjusting sections, the vertical support section steel is correspondingly arranged between two vertically adjacent horizontal support section steel, the bottom end of the vertical support section steel is bolted and fixed with the horizontal support section steel at the position below the vertical support section steel through the connecting bolts, and the vertical adjusting bolts can be used for adjusting the spacing between the two horizontal support section steel in a mode of adjusting the spacing between the vertical support section steel and the horizontal support section steel.

Preferably, the adjusting section is arranged on the rear seat wall close to the jacking starting side of the pipeline, and the vertical support section steel is arranged at one end of the main body section close to the adjusting section.

Preferably, the retaining wall is formed by tamping cement mixing and excavating undisturbed clay, and the compactness of the retaining wall is not less than 90%.

Preferably, the well wall enclosure is a steel sheet pile, an underground diaphragm wall or a filling pile.

Compared with the prior art, the utility model has the beneficial effects that the back seat wall made of the section steel and the supporting section steel are used for constructing a reaction frame, the opening between the back seat wall on two sides of the reaction frame and the well wall surrounding block is reinforced by the rammed retaining wall, compared with the grouting reinforcement in the closed soil body, the construction site is wide and visible, the reinforcement construction is more convenient and efficient, the quality is controllable, the reaction frame and the retaining wall support the well wall surrounding blocks on two sides, the structural stability of the reaction frame is ensured, the stable support is provided for the pipe jacking equipment, the reaction frame can be used as an internal supporting measure of the well wall surrounding block, the unstable overturning of the well wall surrounding block is avoided, the advantages of high construction efficiency, low cost, short construction period and turnover are realized, the matching mode of the reaction frame and the retaining wall can conveniently realize gesture adjustment, and the advantage of bidirectional jacking operation with angles is obvious.

Drawings

The foregoing and/or other aspects and advantages of the present utility model will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative only and not limiting of the utility model, wherein:

FIG. 1 is a schematic plan view of an originating well to which the present utility model relates;

FIG. 2 is a schematic cross-sectional view of an originating well according to the present utility model;

FIG. 3 is a schematic plan view of a reaction frame according to the present utility model;

FIG. 4 is a schematic elevational view of a reaction frame according to the present utility model;

FIG. 5 is a schematic elevational view of a rear wall according to the present utility model;

FIG. 6 is a schematic plan view of an assembly module according to the present utility model;

Fig. 7 is a schematic cross-sectional view of an assembly module according to the present utility model along a long axis direction thereof;

fig. 8 is a schematic sectional view of the assembly module according to the present utility model along the short axis direction thereof.

The concrete foundation slab comprises the following components of 1, an originating well, 2, a concrete foundation slab, 3, a well wall fence, 4, a well inner support, 41, a support bracket, 42, a steel surrounding purlin, 43, an inclined strut, 44, a stiffening plate, 5, a reaction frame, 51, a rear seat wall, 511, an assembling module, 5111, a profile steel framework, 5112, a stiffening rib, 5113, a sealing plate, 512, assembling bolts, 513, a split fixing bolt, 52, a jacking hole, 53, a water stop ring, 54, a horizontal support profile steel, 541, a main section, 542, an adjusting section, 55, a vertical support profile steel, 56, a horizontal adjusting bolt, 57, a vertical adjusting bolt, 58, a connecting bolt, 6, a retaining wall, 7 and a pipeline.

Detailed Description

Hereinafter, an embodiment of a steel structure bi-directional pipe-jacking initiation well roof pipe construction structure of the present utility model will be described with reference to the accompanying drawings. The examples described herein are specific embodiments of the present utility model, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the utility model to the embodiments and scope of the utility model. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification, including those adopting any obvious substitutions and modifications to the embodiments described herein.

In the description of the present utility model, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "upper", "lower", "inner", "outer", "transverse", "longitudinal", "vertical", "oblique", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The drawings in the present specification are schematic views, which assist in explaining the concept of the present utility model, and schematically show the shapes of the respective parts and their interrelationships. Note that, in order to clearly show the structures of the components of the embodiments of the present utility model, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.

The principles and features of the present utility model are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present utility model. The preferred embodiment of the present utility model is described in further detail below in conjunction with fig. 1-8:

Example 1

The utility model discloses a pipe-jacking construction structure of a steel structure bidirectional pipe-jacking starting well, which comprises a concrete bottom plate 2 arranged at a bottom hole position, a well wall enclosing shield 3 arranged at the surrounding well wall position, an in-well support 4 arranged at the inner side of the well wall enclosing shield 3, and a reaction frame 5 arranged on the concrete bottom plate 2, wherein the reaction frame 5 comprises two opposite backseat walls 51, jacking holes 52 for the pipe jacking to pass through are formed in the two backseat walls 51, the two backseat walls are fixedly connected through supporting profile steel, the backseat walls 51 and the well wall enclosing shield 3 are filled and reinforced through a rammed compact retaining wall 6, and the reaction frame 5 is of an integral structure in the embodiment.

The embodiment also correspondingly provides a construction method corresponding to the pipe-jacking construction structure of the steel structure bidirectional pipe-jacking starting well, which comprises the following steps:

step S1, a reaction frame 5 is manufactured by processing, the rear seat walls 51 are formed by taking ribbed I-steel or ribbed channel steel as a main body through welding, the two rear seat walls 51 are fixedly bolted or welded through horizontal support section steel 54, and the horizontal support section steel 54 can also be manufactured by adopting I-steel or channel steel;

Step S2, the originating well 1 is excavated, a well wall enclosure 3 is firstly constructed, then a foundation pit of the originating well 1 is excavated, an in-well support 4 is constructed while the excavation is carried out as a supporting measure, a concrete bottom plate 2 is poured after the excavation is carried out to the designed depth along with the support, the well wall enclosure 3 and the in-well support 4 play a role in supporting the boundary of the foundation pit of the originating well 1, a structure that the pit wall is not collapsed after the excavation of soil in the pit is ensured, and simultaneously, the water stopping effect in the set depth range is achieved, the well wall enclosure 3 can adopt structural forms such as steel sheet piles, underground continuous walls or cast-in-place piles, in the embodiment, the depth of the originating well 1 is 10.7m, the length is 9.7m, the width is 5.6m, the construction period requirement is considered, 15 mSP-U400X 170 steel sheet piles are adopted for supporting, the in-well support 4 specifically comprises steel enclosure purlins 42, the steel purlins 42 are placed on the support brackets 41, the support brackets 41 are welded and fixed on the steel sheet piles, the steel purlins 42 are reinforced by diagonal bracing 43, the steel purlins 42 are 400×400×20×10H steel, the diagonal bracing 43 is 400×400×20× 10H steel, and the steel piles at the corners of the originating well 1 are reinforced by welding fixed stiffening plates 44, in this embodiment, the manually excavated exploratory pit with the size of 11.7m long by 7.6m wide by 2m deep is adopted before the originating well 1 foundation pit is excavated, the existing water supply pipeline and communication cables are identified and removed by the exploratory pit excavation, the steel piles are firstly applied, 12m steel piles are applied, 5m steel piles are lapped, after the steel piles are applied, the originating well 1 foundation pit is excavated, the steel purlins 42 are supported by welding and fixed every 2m, a silt layer with the thickness of about 4m appears after the water collecting pit is excavated to the depth of 6.7m, temporary pits are arranged after the water collecting pit is excavated to the design depth of 10.42m, according to the address condition, foundation treatment is carried out (0.5 m brick slag is adopted to replace a pit bottom), after the foundation treatment is finished, a 5cm concrete cushion layer is poured, steel bars are bound and a concrete bottom plate 2 is poured according to a drawing (the concrete bottom plate 2 can be used as an inspection well bottom plate in sewage engineering and the concrete bottom plate 2 can be used as a valve well bottom plate in water supply engineering), the size of the concrete bottom plate 2 is determined according to a jacking pipe structure diagram, the thickness is not less than 20cm (the elevation of the top surface of the concrete bottom plate 2 is comprehensively determined according to the designed jacking pipe elevation and the height of a rear seat wall 51), water collecting pits not less than 0.5Wx0.5Lx0.6H are arranged on two sides of a waist line of the concrete bottom plate 2, a drainage submersible pump is arranged as a precipitation point in the pit, and meanwhile, in order to ensure the safety of jacking pipe construction, a water level meter outside the pit, a water level meter inside the pit foundation deformation monitoring device outside the pit and a foundation deformation monitoring device inside the pit are also required before construction;

Step S3, installing a reaction frame 5, prefabricating the reaction frame 5 on the ground, lifting the reaction frame 5 to the bottom of the starting well 1 through a gantry crane installed at a wellhead position, and then installing the reaction frame 5 on the concrete bottom plate 2 and adjusting the position of the reaction frame to ensure that the center line of a jacking hole 52 on a back seat wall 51 at the jacking starting side of the pipeline 7 coincides with the design center line of the pipeline 7;

S4, plugging the jacking hole 52, adopting red bricks as plugging materials to build the jacking hole 52, tightly plugging the jacking holes 52 of the front and rear seat walls 51 of the reaction frame 5 through the red bricks, and further adopting 1:2.5 cement mortar to build and plug the outer surface of the red bricks;

Step S5, tamping the retaining wall 6, wherein 5% cement mixing is adopted to excavate the original clay for backfilling between the rear seat wall 51 and the well wall surrounding block 3, tamping is carried out, the compaction degree of the retaining wall 6 is not less than 90%, when tamping is carried out to the height of the jacking hole 52, the part of the well wall surrounding block 3 on the jacking route is cut and broken, 5% cement mixing is adopted to excavate the original clay for backfilling the cutting position for reinforcing the hole, when the retaining wall 6 is backfilled, the retaining wall 6 is tamped layer by layer in a layer manner according to a layer of 20cm, after tamping is carried out to the height of the bottom surface of the jacking hole 52, supporting steel sheet piles are cut layer by layer according to a layer of 20cm, and tamping is carried out along with cutting, when tamping is carried out on the retaining wall 6, the symmetry of the front wall and the rear wall is ensured, the tamping height difference between the two sides is not higher than 40cm, and the backfilling height of the retaining wall 6 is not lower than 1.5 times the outer diameter of the pipeline 7;

S6, jacking equipment and a water stop ring 53 are installed, jacking pipes are installed on a rear seat wall 51, bolts are used for dispersing the jacking force of a hydraulic jack, the track height is installed and adjusted on a concrete bottom plate 2 according to design requirements, steel plate patches with different thicknesses are used for adjusting the track height to the design height, the track is fixed on the concrete bottom plate 2 by expansion bolts to prevent movement, then a water stop ring 53 is installed at a jacking hole 52 of the rear seat wall 51 at one side of a hole, the water stop ring 53 is fixed on the rear seat wall 51 by bolts, a rubber gasket is arranged between the rear seat wall 51 and the water stop ring 53 in a filling manner to prevent slurry leakage, after the installation of the water stop ring 53 is completed, a gantry crane is used for once hoisting 4 hydraulic jacks, the hydraulic jacks are installed on a jacking pipe bracket and fixed, then a main oil cylinder is started for debugging the hydraulic jack, after the debugging is completed, a mud water balance tool head is hoisted and placed at a position 60cm behind the jacking hole 52, then a brick layer of the jacking hole 2 is broken, the water stop ring 53 is pushed into the water stop ring 53 to enable the inside of the jacking pipe to be tightly fitted into the jacking pipe, and the jacking pipe is filled with the inner wall 6 to be tightly plugged, and the jacking equipment is installed in place;

s7, jacking construction, namely finishing jacking construction operation of the section pipeline 7 corresponding to the current jacking direction of the current starting well 1 at one time according to a jacking construction operation manual;

Step S8, adjusting the jacking direction of jacking equipment, dismantling jacking pipes such as a jacking pipe tool head, a jacking iron, a hydraulic jack, a slurry pipeline and other auxiliary equipment, lifting the jacking pipes and the auxiliary equipment to the ground at one time, then breaking and dismantling the retaining wall 6, lifting rammed earth to the ground, adjusting the posture of the counter-force frame 5 through the gantry crane to adjust the reverse jacking construction angle, enabling the center line of a jacking hole 52 on the reverse rear seat wall 51 to coincide with the design center line of the pipeline 7, and eliminating the need of adjusting the posture of the counter-force frame 5 and eliminating the need of breaking and dismantling the retaining wall 6 when no angle exists in the bidirectional jacking construction;

And S9, carrying out jacking construction in the opposite direction, and repeating the corresponding procedure contents of the steps S4 to S7 to finish the jacking construction operation of the pipeline 7 in the opposite direction.

Example 2

As shown in fig. 1-4, another preferable steel structure bidirectional pipe-jacking starting well pipe-jacking construction structure comprises a concrete bottom plate 2 arranged at a bottom hole position, a well wall enclosing block 3 arranged at the periphery well wall position, an in-well support 4 arranged at the inner side of the well wall enclosing block 3, and a reaction frame 5 arranged on the concrete bottom plate 2, wherein the reaction frame 5 comprises two opposite backseat walls 51, jacking holes 52 for the pipe-jacking to pass through are formed in the two backseat walls 51, the two backseat walls are fixedly connected through supporting profile steel, and the backseat walls 51 and the well wall enclosing block 3 are filled and reinforced through a rammed compact retaining wall 6;

considering that in embodiment 1, the reaction frame 5 of the integral structure has larger volume and weight, the gantry crane with higher lifting capacity is required, the originating well 1 with larger size is required, and the field operation construction difficulty is caused to be larger, in order to more flexibly perform pipe jacking construction and reduce the construction difficulty, in this embodiment, the reaction frame 5 is optimally designed into a modularized assembly form, the specific structural form of the reaction frame 5 is as follows,

As shown in fig. 5-8, the rear seat wall 51 is formed by assembling a plurality of assembling modules 511, the assembling modules 511 are stacked sequentially from bottom to top, two adjacent assembling modules 511 are connected and fixed by assembling bolts 512, at least one opposite-pull fixing bolt 513 is arranged on two sides of the rear seat wall 51, the opposite-pull fixing bolts 513 penetrate through the assembling modules 511 stacked together from top to bottom and are fixedly tied into a whole, the assembling modules 511 take a steel skeleton 5111 made of H-shaped steel as a main body, a plurality of stiffening ribs 5112 are welded and fixed in the abdominal cavity of the steel skeleton 5111 at intervals, the outer edges of the stiffening ribs 5112 are flush with the edges of wing plates of the steel skeleton 5111, the opening of the abdominal cavity of the steel skeleton 5111 is closed by welding fixed sealing plates 5113, through holes and operation holes for installing the assembling bolts 512 and the opposite-pull fixing bolts 513 are correspondingly formed in webs of the sealing plates 5113 and the steel skeleton 5111, the assembling modules 511 comprise a sealing ring 52 which is positioned in the horizontal distribution range of the jacking opening 52 and a sealing ring 52 which is positioned in the horizontal distribution range of the corresponding to the sealing ring 52, and the sealing ring 52 is positioned in the position of the corresponding sealing ring 52 is arranged at the position of the corresponding opening of the sealing ring which is matched with the sealing opening 52;

The support section steel comprises a plurality of horizontal support section steel 54 and a plurality of vertical support section steel 55, the horizontal support section steel 54 is correspondingly arranged at two sides of the rear seat wall 51, each horizontal support section steel 54 comprises a main body section 541 and an adjusting section 542, the length of the main body section 541 is larger than that of the adjusting section 542, one ends of the main body section 541, which are far away from each other, are bolted and fixed with the corresponding rear seat wall 51 through connecting bolts 58, one ends of the main body section steel 54, which are close to each other, are fixedly tied through the horizontal adjusting bolts 56, the horizontal adjusting bolts 56 can realize the adjustment of the length of the horizontal support section steel 54 through the way of adjusting the distance between the main body section 541 and the adjusting section 542, the vertical support section steel 55 is correspondingly arranged between the two vertically adjacent horizontal support section steel 54, the bottom end of the vertical support section steel 55 is bolted and fixed with the horizontal support section steel 54 at the lower position thereof through the connecting bolts 58, the top end of the assembly module 511 is fixedly tied with the horizontal support section steel 54 at the upper position of the assembly module 511 through the vertical adjusting bolts 57, the vertical adjusting bolts 57 can realize the distance between the two horizontal support section steels 54 by adjusting the distance between the vertical support section steel 55 and the horizontal support section steel 54, wherein the assembly module 511 is the main body of the rear seat wall 51, the specific size and the number of the assembly module 511 are determined according to the height and the jacking force, the assembly bolts 512 and the opposite-pulling fixing bolts 513 are used for fixing the assembly module 511 so as to enable the rear seat wall 51 to form integral stress, the horizontal support section steel 54 and the vertical support section steel 55 are used for connecting and fixing the front rear seat wall 51 and the rear seat wall 51, the problem of side-tipping instability of the rear seat wall 51 in the splicing and subsequent construction processes is prevented, the horizontal support section steel 54 is optimized into a two-section structural form, and the problem of difficult positioning when the size is consistent with the distance between the two rear seat walls 51 can be avoided in the installation process, the horizontal adjusting bolts 56 and the vertical adjusting bolts 57 are arranged, so that the positions of the horizontal supporting section steel 54 and the vertical supporting section steel 55 can be adjusted, the reaction frame 5 is square, namely, the horizontal adjusting bolts 56 are used for adjusting square so as to ensure that the back seat wall 51 is vertical to the jacking direction, the jacking hole 52 is accurate in position, the vertical adjusting bolts 57 are used for adjusting the setting height of the water vertical supporting section steel 55 so as to facilitate mounting and dismounting, and in addition, the horizontal adjusting bolts 56 can also loosen the back seat wall 51 through screwing of the horizontal adjusting bolts 56 in the process of breaking and dismounting the retaining wall 6 so as to reduce the breaking and dismounting difficulty of the retaining wall 6;

The adjusting section 542 is disposed on the back wall 51 near the side where the pipeline 7 is pushed into the originating side, so as to better realize position adjustment of the back wall 51 on the side where the pipeline 7 is to be pushed into, thereby ensuring that the center line of the pushing hole 52 coincides with the design center line of the pipeline 7, and the vertical supporting section steel 55 is disposed at one end of the main section 541 near the adjusting section 542, so as to dispose the vertical supporting section steel 55 at a relatively free end of the horizontal supporting section steel 54, thereby reducing the difficulty of square adjustment.

Meanwhile, the embodiment also correspondingly provides a construction method corresponding to the pipe-jacking construction structure of the steel structure bidirectional pipe-jacking starting well, which comprises the following steps:

S1, processing and manufacturing a reaction frame 5, adopting a 400 multiplied by 20H-shaped steel processing and assembling module 511, wherein the width of a standard section assembling module 511 is 5M, adopting M24 high-strength bolts as assembling bolts, adopting M30 wire screws and matched nuts as opposite-pull fixing bolts 513, adopting phi 2200mm steel pipes as a steel sleeve pipe of a jacking hole 52, dividing and welding, adding 12.7 ten thousand RMB materials as a total, specifically comprising the following steps,

S11, cutting a section steel skeleton 5111, determining the length of a module according to the top force requirement, and cutting the section steel into a plurality of sections with the same length by adopting H-shaped steel with the model of 400 multiplied by 20;

Step S12, welding stiffening ribs 5112 with the inner space of the profile steel skeleton 511 being 400mm, wherein the stiffening ribs 5112 are made of 10mm thick steel plates, the stiffening ribs 5112 are fully welded on both sides, and the top surfaces of the stiffening ribs 5112 are ensured to be level with the flanges of the profile steel skeleton 5111 after the welding is finished;

Step S13, welding a sealing plate 5113, paving steel plates with the width of 400mm and the thickness of 10cm on two sides of an opening of the H-shaped steel, leveling, fixing by spot welding, and then fully welding;

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

Step S15, reserving phi 32 holes at the positions 30cm and 60cm away from the edges of the two ends of the assembly module 511 as bolt penetrating holes of the split fixing bolts 513;

S16, machining and manufacturing horizontal support section steel 54 and vertical support section steel 55, cutting the horizontal support section steel 54 and the vertical support section steel 55 according to design dimensions, wherein the horizontal support section steel 54 and the vertical support section steel 55 are 300×300×21×17H-shaped steel, and 400×400×10mm steel plates are welded at two ends of the H-shaped steel and are used for arranging connecting bolts 58, horizontal adjusting bolts 56 or vertical adjusting bolts 57;

Step S17, processing the jacking hole 52, specifically comprising the following steps,

Step S171, processing a steel sleeve of a jacking hole 52 according to the outer diameter size of the pipeline 7, wherein the inner diameter of the steel sleeve is 20mm larger than the outer wall size of the push bench, the thickness of the steel sleeve is 400mm, dividing the steel sleeve by contour lines of the height (400 mm) of an assembly module 511, and cutting the steel sleeve into corresponding arc sections corresponding to the contour lines;

Step S172, temporarily splicing the splicing modules 511 of the rear seat wall 51, and drawing a circle mark according to the height of the reserved jacking hole 52 and the outer diameter of the steel sleeve;

Step S173, cutting the standard segment assembly modules 511 at the corresponding positions along the marked arc lines to form non-standard segment assembly modules 511, welding and fixing the corresponding steel sleeve arc segments on the corresponding non-standard segment assembly modules 511, ensuring that all welding seams are fully welded, and polishing;

Step S174, processing flange holes on the periphery of the jacking hole 52, drawing lines according to the flange plate of the water stop ring 53 of the jacking hole 52, determining the positions and the sizes of screw holes, processing bolt penetrating holes on the assembly modules 511 at corresponding positions, welding corresponding nuts on the inner sides of the bolt penetrating holes, and ensuring that the nuts are tightly attached to the wing plates of the profile steel skeleton 5111 and are fully welded and fixed;

Step S2, the originating well 1 is excavated, a well wall enclosure 3 is firstly constructed, then a foundation pit of the originating well 1 is excavated, an in-well support 4 is constructed while the excavation is carried out as a supporting measure, a concrete bottom plate 2 is poured after the excavation is carried out to the designed depth along with the support, the well wall enclosure 3 and the in-well support 4 play a role in supporting the boundary of the foundation pit of the originating well 1, a structure that the pit wall is not collapsed after the excavation of soil in the pit is ensured, and simultaneously, the water stopping effect in the set depth range is achieved, the well wall enclosure 3 can adopt structural forms such as steel sheet piles, underground continuous walls or cast-in-place piles, in the embodiment, the depth of the originating well 1 is 10.7m, the length is 9.7m, the width is 5.6m, the construction period requirement is considered, 15 mSP-U400X 170 steel sheet piles are adopted for supporting, the in-well support 4 specifically comprises steel enclosure purlins 42, the steel purlins 42 are placed on the support brackets 41, the support brackets 41 are welded and fixed on the steel sheet piles, the steel purlins 42 are reinforced by diagonal bracing 43, the steel purlins 42 are 400×400×20×10H steel, the diagonal bracing 43 is 400×400×20× 10H steel, and the steel piles at the corners of the originating well 1 are reinforced by welding fixed stiffening plates 44, in this embodiment, the manually excavated exploratory pit with the size of 11.7m long by 7.6m wide by 2m deep is adopted before the originating well 1 foundation pit is excavated, the existing water supply pipeline and communication cables are identified and removed by the exploratory pit excavation, the steel piles are firstly applied, 12m steel piles are applied, 5m steel piles are lapped, after the steel piles are applied, the originating well 1 foundation pit is excavated, the steel purlins 42 are supported by welding and fixed every 2m, a silt layer with the thickness of about 4m appears after the water collecting pit is excavated to the depth of 6.7m, temporary pits are arranged after the water collecting pit is excavated to the design depth of 10.42m, according to the address condition, foundation treatment is carried out (0.5 m brick slag is adopted to replace a pit bottom), after the foundation treatment is finished, a 5cm concrete cushion layer is poured, steel bars are bound and a concrete bottom plate 2 is poured according to a drawing (the concrete bottom plate 2 can be used as an inspection well bottom plate in sewage engineering and the concrete bottom plate 2 can be used as a valve well bottom plate in water supply engineering), the size of the concrete bottom plate 2 is determined according to a jacking pipe structure diagram, the thickness is not less than 20cm (the elevation of the top surface of the concrete bottom plate 2 is comprehensively determined according to the designed jacking pipe elevation and the height of a rear seat wall 51), water collecting pits not less than 0.5Wx0.5Lx0.6H are arranged on two sides of a waist line of the concrete bottom plate 2, a drainage submersible pump is arranged as a precipitation point in the pit, and meanwhile, in order to ensure the safety of jacking pipe construction, a water level meter outside the pit, a water level meter inside the pit foundation deformation monitoring device outside the pit and a foundation deformation monitoring device inside the pit are also required before construction;

Step S3, installing a reaction frame 5, installing the reaction frame 5 on the concrete bottom plate 2, ensuring that the center line of a jacking hole 52 on a rear seat wall 51 at the jacking starting side of the pipeline 7 coincides with the design center line of the pipeline 7, specifically comprising the following steps of,

Step S31, determining a design center line of the pipeline 7 and the installation position of the rear seat wall 51 according to a construction drawing, and lofting by combining the jacking direction;

Step S32, installing a first layer assembly module 511, a split fixing bolt 513 and a first layer horizontal support section steel 54 at the bottom of the rear seat wall 51, adjusting the square through a horizontal adjusting bolt 56, sequentially fastening a connecting bolt 58 between the horizontal support section steel 54 and the rear seat wall 51, and adjusting the square through the horizontal adjusting bolt 56 again after fastening is completed, so as to ensure that the diagonal length of a rectangular frame formed by the first layer assembly module 511 and the first layer horizontal support section steel 54 is equal;

Step S33, assembling a standard section assembling module 511 and a non-standard section assembling module 511 in sequence, fastening assembling bolts 512 layer by layer to prevent inclination, synchronously installing vertical support section steel 55 and horizontal support section steel 54 along with the installation progress in the installation process, and adjusting square by using horizontal adjusting bolts 56 and vertical adjusting bolts 57;

S4, plugging the jacking hole 52, adopting red bricks as plugging materials to build the jacking hole 52, tightly plugging the jacking holes 52 of the front and rear seat walls 51 of the reaction frame 5 through the red bricks, and further adopting 1:2.5 cement mortar to build and plug the outer surface of the red bricks;

S5, tamping the retaining wall 6, wherein 5% cement mixing is adopted to excavate original clay for backfilling between the rear seat wall 51 and the well wall surrounding block 3, tamping and compacting are carried out, the compactness of the retaining wall 6 is not less than 90%, in the embodiment, the compactness is controlled to be 95%, when tamping is carried out to the height of the jacking hole 52, the part of the well wall surrounding block 3 on the jacking route is cut and broken, 5% cement mixing is adopted to excavate original clay for backfilling the cut position for compacting and reinforcing the hole, when the retaining wall 6 is backfilled, the layer by layer is tamped in a layer mode of 20cm, after tamping is carried out to the height of the bottom surface of the jacking hole 52, the supporting steel sheet piles are cut layer by layer according to 20cm, and when tamping is carried out along with the cutting and filling, the symmetrical tamping of the wall on the front side and the rear side of the wall is ensured, the height difference between the two sides is not higher than 40cm, and the height of the retaining wall 6 is not lower than 1.5 times of the outer diameter of the pipeline 7;

S6, jacking equipment and a water stop ring 53 are installed, jacking pipes are installed on a rear seat wall 51, bolts are used for dispersing the jacking force of a hydraulic jack, the track height is installed and adjusted on a concrete bottom plate 2 according to design requirements, steel plate patches with different thicknesses are used for adjusting the track height to the design height, the track is fixed on the concrete bottom plate 2 by expansion bolts to prevent movement, then a water stop ring 53 is installed at a jacking hole 52 of the rear seat wall 51 at one side of a hole, the water stop ring 53 is fixed on the rear seat wall 51 by bolts, a rubber gasket is arranged between the rear seat wall 51 and the water stop ring 53 in a filling manner to prevent slurry leakage, after the installation of the water stop ring 53 is completed, a gantry crane is used for once hoisting 4 hydraulic jacks, the hydraulic jacks are installed on a jacking pipe bracket and fixed, then a main oil cylinder is started for debugging the hydraulic jack, after the debugging is completed, a mud water balance tool head is hoisted and placed at a position 60cm behind the jacking hole 52, then a brick layer of the jacking hole 2 is broken, the water stop ring 53 is pushed into the water stop ring 53 to enable the inside of the jacking pipe to be tightly fitted into the jacking pipe, and the jacking pipe is filled with the inner wall 6 to be tightly plugged, and the jacking equipment is installed in place;

s7, jacking construction, namely finishing jacking construction operation of the section pipeline 7 corresponding to the current jacking direction of the current starting well 1 at one time according to a jacking construction operation manual;

Step S8, adjusting the jacking direction of jacking equipment, dismantling the jacking equipment and lifting to the ground, breaking and dismantling the retaining wall 6 and lifting the rammed earth to the ground, adjusting the posture of the counter-force frame 5 to adjust the construction angle of the counter-force frame to enable the center line of the jacking hole 52 on the counter-force back seat wall 51 to coincide with the design center line of the pipeline 7, specifically comprising the following steps of,

S81, dismantling jacking pipes such as a jacking pipe tool head, a jacking iron, a hydraulic jack, a slurry pipeline and other auxiliary equipment, and lifting to the ground at one time;

step S82, adjusting the horizontal adjusting bolts 56, loosening the rammed retaining wall 6 between the rear seat wall 51 and the well wall surrounding shield 3, breaking the retaining wall 6 and lifting the filled soil to the ground, and synchronously removing the horizontal supporting section steel 54 and the vertical supporting section steel 55 of the rear seat wall 51 in the process of removing the retaining wall 6;

Step S83, reinstalling the reaction frame 5 according to the corresponding procedure content of the steps S31 to S33, wherein the jacking hole 52 on the jacking completed side rear seat wall 51 is required to be correspondingly sleeved on the jacking completed part of the pipeline 7, so that the jacking completed side pipeline 7 extends into the originating well 1 through the jacking hole 52;

Step S9, reverse jacking construction, namely repeating the procedure content corresponding to the steps S4 to S7 to finish the jacking construction operation of the reverse pipeline 7, wherein the specific steps are as follows,

Step S91, plugging the jacking hole 52, adopting red bricks as plugging materials to build the jacking hole 52, tightly plugging the jacking hole 52 of the back seat wall 51 at the side to be jacked by the reaction frame 5 through the red bricks, and further building and plugging the outer surface of the red bricks by adopting 1:2.5 cement mortar;

Step S92, tamping the retaining wall 6, wherein 5% cement is used for mixing and excavating original clay between the rear seat wall 51 and the well wall surrounding block 3, tamping is carried out, the compaction degree of the retaining wall 6 is not less than 90%, in the embodiment, the compaction degree is controlled to be 95%, when tamping is carried out to the height of the jacking hole 52, the part of the well wall surrounding block 3 on the jacking route on the side to be jacked is cut and broken, 5% cement is used for mixing and excavating original clay, the cutting position is backfilled and compacted by adopting the 5% cement for reinforcing the hole, when the retaining wall 6 is backfilled, the layer by layer is tamped in a 20cm layer manner, after tamping is carried out to the bottom surface of the jacking hole 52, the supporting steel sheet piles are cut layer by layer according to 20cm layer, and the tamping is carried out along with the tamping, when tamping is carried out, the retaining wall 6 is tamped, the symmetric tamping is ensured at the same time, the height difference between the front side and the rear side is not greater than 40cm, and the backfill height of the retaining wall 6 is not less than 1.5 times the outer diameter of the pipeline 7;

Step S93, reinstalling the jacking equipment and the water stop ring 53, installing the jacking equipment at the counter-force frame 5, and installing the water stop ring 53 at the jacking hole 52 of the rear seat wall 51 at the side to be jacked;

And S94, jacking construction, namely finishing the reverse jacking construction operation of the corresponding section pipeline 7 of the current starting well 1 according to a jacking construction operation manual.

The embodiment 2 is practically applied to the construction of a bidirectional jacking working well of a test section of a pipe jacking project of a new construction project of a sewage main pipe network of the XX project, and compared with the traditional concrete back seat wall, the construction time of the first working well is comprehensively saved by 15 working shifts in the construction process of the test section, and the adjustment and the construction time of the working well are saved by about 10 working days when the jacking direction is adjusted;

the reinforced concrete consumption is comprehensively saved by 32m < 3 > and 78,960 Yuan-ren-nationals, the total construction material cost of 26 working wells is expected to be saved by 205 Yuan-ren-zen-als, and the construction time of the working wells is expected to be saved by 650 benches.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims (7)

1. The utility model provides a two-way push pipe of well push pipe construction structures that originates of steel construction, includes concrete bottom plate (2) that sets up in the bottom hole position, sets up in the wall of a well that surrounds in wall of a well position all around and enclose and keep off (3) inboard in the wall of a well and prop up (4), wherein still includes reaction frame (5) that set up on concrete bottom plate (2), reaction frame (5) include two back seat walls (51) of setting relatively, have all offered on two back seat walls (51) and have supplied the push pipe to pass and have advanced entrance to a cave (52), link to each other through supporting shaped steel is fixed between the two, and back seat wall (51) and wall of a well enclose and keep off (3) between through the filled and filled up closely retaining wall (6) of ramming and consolidate.

2. The construction structure of the pipe jacking of the steel structure bi-directional pipe jacking starting well is characterized in that the rear seat wall (51) is formed by assembling a plurality of assembling modules (511), the assembling modules (511) are sequentially stacked from bottom to top, two adjacent assembling modules (511) are fixedly connected through assembling bolts (512), at least one opposite-pull fixing bolt (513) is arranged on two sides of the rear seat wall (51), the opposite-pull fixing bolts (513) penetrate through the assembling modules (511) stacked together from top to bottom, and all the assembling modules (511) penetrated by the opposite-pull fixing bolts are tied and fixed into a whole.

3. The bidirectional jacking pipe construction structure of the steel structure starting well is characterized in that the assembly module (511) takes a steel skeleton (5111) made of H-shaped steel as a main body, a plurality of stiffening ribs (5112) are welded and fixed in the abdominal cavity of the steel skeleton (5111) at intervals, the outer edges of the stiffening ribs (5112) are flush with the edges of the wing plates of the steel skeleton (5111), the abdominal cavity opening of the steel skeleton (5111) is closed by a sealing plate (5113) fixed by welding, through holes and operation holes for installing assembly bolts (512) and opposite pulling fixing bolts (513) are correspondingly formed in webs of the sealing plate (5113) and the steel skeleton (5111), the assembly module (511) comprises non-standard sections positioned in the horizontal distribution range of the jacking holes (52) and standard sections positioned outside the horizontal distribution range of the jacking holes (52), one end, close to the jacking holes (52), of the non-standard section assembly module (511) is cut into sections matched with the jacking holes (52) of the corresponding sections, and the corresponding sections are provided with through holes for installing the arc-shaped sealing rings (53) on the corresponding sealing rings.

4. The construction structure of the pipe jacking construction of the steel structure bi-directional pipe jacking starting well, as set forth in claim 1, wherein the supporting section steel comprises a plurality of horizontal supporting section steel (54) and a plurality of vertical supporting section steel (55), the horizontal supporting section steel (54) is correspondingly arranged at two sides of the back seat wall (51), each horizontal supporting section steel (54) comprises two sections of a main body section (541) and an adjusting section (542), the length of the main body section (541) is larger than that of the adjusting section (542), one ends of the main body section steel (541) far away from each other are fixedly connected with the corresponding back seat wall (51) through connecting bolts (58), one ends of the two adjacent end of the two end sections are fixedly connected with the corresponding back seat wall (51) through tie-down bolts (56), the horizontal supporting section steel (54) can be adjusted in a mode of adjusting the distance between the main body section steel (541) and the adjusting section steel (542), the bottom end of the vertical supporting section steel (55) is correspondingly arranged between the two vertically adjacent horizontal supporting section steel (54), the bottom end of the vertical supporting section steel (55) is fixedly connected with the top end of the horizontal supporting section steel (54) through the connecting bolts (58) at the vertical supporting section steel (57), and the vertical adjusting bolt (57) can realize the interval between the two horizontal support section steel (54) by adjusting the interval between the vertical support section steel (55) and the horizontal support section steel (54).

5. The construction structure of a pipe-jacking construction of a two-way pipe-jacking initiation well of steel structure according to claim 4, wherein the adjusting joint (542) is arranged on the rear seat wall (51) close to the jacking initiation side of the pipeline (7), and the vertical supporting section steel (55) is arranged at one end of the main body joint (541) close to the adjusting joint (542).

6. The construction structure of the steel structure bi-directional pipe-jacking starting well pipe-jacking of claim 1, wherein the retaining wall (6) is formed by tamping cement-mixed excavated undisturbed clay, and the compactness of the retaining wall (6) is not less than 90%.

7. The construction structure of the steel structure bi-directional pipe-jacking starting well pipe jacking according to claim 1, wherein the well wall surrounding baffle (3) is a steel sheet pile, an underground diaphragm wall or a filling pile.