Pipe-jacking prefabricated reverse working well for long-distance pipeline engineering

Abstract

The utility model discloses a pipe-jacking prefabricated reverse working well for long-distance pipeline engineering, which is composed of a plurality of layers of well sections, the well sections are respectively a locking opening section, a well wall section and a well bottom plate from top to bottom, the locking opening section is provided with one layer and is formed by splicing a plurality of locking opening ring pieces, the well wall section is provided with a plurality of layers and is formed by splicing a plurality of well wall ring pieces in a staggered joint mode, and the well bottom plate is formed by splicing a plurality of well wall ring pieces in a staggered joint mode. The well bottom plate is cast-in-place formed through concrete; the adjacent ring pieces are fixed through connecting pieces; waterproof structures are arranged at vertical seams and horizontal seams formed by splicing the ring pieces; the outer walls of the opening locking ring piece and the well wall ring piece are of a variable cross-section structure and can be fixed through the lateral pressure of the circumferential soil body around the foundation pit and the self-resistance of the soil body. The working well adopts a method of prefabricating a lock mouth ring piece and a well wall ring piece in advance and performing field assembly construction, construction is performed through a reverse construction method, a foundation pit is excavated layer by layer from top to bottom, and the working well is assembled, so that the field construction time and cross operation can be reduced, the excavation volume of the foundation pit is reduced, and the construction efficiency and quality of the working well are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to municipal construction technical field, concretely relates to a kind of for long-distance pipeline engineering pipe-jacking prefabricated reverse construction working well. BACKGROUND

[0002] With the continuous advancement of urbanization, underground pipeline engineering construction scale is increasingly expanding. When oil and gas transmission pipeline crosses urban road, it needs to minimize ground excavation area and ensure urban traffic road unobstructed, for which the most commonly used is pipe-jacking construction technology. Pipe-jacking construction is a non-excavation method of underground pipeline construction, which sets a vertical shaft as pipe-jacking working well at the starting point and the end point without digging the surface, one as sending well and one as receiving well, then uses pipe-jacking equipment to push the pipeline into the soil layer in the sending well, and advances to the receiving well.

[0003] Working well as the starting point and the end point of pipe-jacking construction is an important part of pipe-jacking engineering, and its construction quality directly affects the construction progress and quality of the whole pipe-jacking engineering. At present, the most commonly used working well construction method mainly has two kinds:

[0004] The first one is cast-in-place construction method, which builds formwork and steel reinforcement after excavating foundation pit according to design requirements, pours concrete on site to form working well; but this construction method not only has long construction period and difficult construction quality guarantee, but also is greatly affected by weather and environment, has large on-site operation amount, and needs to wait for concrete to reach a certain strength, which seriously affects construction progress.

[0005] The second one is caisson construction method, which precast each component of working well according to design requirements, assembles on site and then puts into foundation pit, and uses self-weight and external force to make well body sink to design elevation; but this method has many uncontrollable factors during caisson sinking process, which easily causes safety problems such as deviation, inclination, sinking difficulty, sudden sinking, etc., affecting engineering quality. UTILITY MODEL CONTENT

[0006] In view of the deficiencies of prior art, a pipe-jacking prefabricated reverse construction working well for long-distance pipeline engineering is provided, which adopts the combination of precasting and reverse construction, installs working well layer by layer from top to bottom, can reduce foundation pit excavation amount, reduce the influence on surrounding environment, and improve working well construction efficiency and quality.

[0007] The utility model discloses a technical scheme is as follows: A kind of pipe jacking prefabricated top-down working well for long-distance pipeline engineering, it is characterized by: the working well is composed of multilayer well section, from top to bottom are lock mouth section, well wall section and well bottom plate, the basic unit of the lock mouth section and well wall section is prefabricated ring piece, the well bottom plate is formed by cast-in-situ;Lock mouth section sets a layer, is assembled by lock mouth ring piece, well wall section sets multilayer, is assembled by well wall ring piece staggered joint, adjacent ring piece is fixed by connecting piece between;The assembly joint of ring piece in the same layer well section is vertical seam, the assembly joint of ring piece between different layer well section is horizontal seam, waterproof structure is arranged in vertical seam and horizontal seam;The outer wall of lock mouth ring piece and well wall ring piece is variable cross section structure, can be fixed using circumferential earth body side pressure around foundation pit and earth body self resistance.

[0008] According to the above technical scheme, the cross section of the lock mouth ring piece adopts a concave structure with wide upper and lower parts and narrow middle part, and the outer wall thereof is arc-shaped concave along the circumferential direction; the cross section of the well wall ring piece adopts a trapezoidal structure with narrow upper end and wide lower end, and the outer wall thereof gradually expands outward at the bottom end.

[0009] According to the above technical scheme, the lock mouth ring piece and the well wall ring piece are provided with at least two corresponding circular arc-shaped grooves on each joint surface, one end of the groove is arranged on the inner wall of the ring piece, and the other end extends to the joint surface of the ring piece.

[0010] According to the above technical scheme, the connecting piece includes a stud and a nut matched with the groove, the stud is detachably arranged in the groove, and both ends of the stud are fixed by the nut.

[0011] According to the above technical scheme, the waterproof structure includes an elastic sealing plate and a water stop strip, the sealing plate is clamped between the joint surfaces of adjacent ring pieces, a water stop groove is arranged on the ring piece, and the water stop strip is arranged in the water stop groove.

[0012] According to the above technical scheme, the lock mouth ring piece and the well wall ring piece are provided with bevels at the edges of the inner wall and the outer wall of the joint surface, sponge strips are filled in the bevels when the ring pieces are jointed, and sealing glue is coated outside the joint.

[0013] According to the above technical scheme, the lock mouth ring piece and the well wall ring piece are provided with bevels at the edges of the inner wall and the outer wall of the joint surface, sponge strips are filled in the bevels when the ring pieces are jointed, and sealing glue is coated outside the joint.

[0014] According to the above technical scheme, the height of the lock mouth ring piece and the well wall ring piece is 1-1.5 m. The arc angle of the lock mouth ring piece and the well wall ring piece is 30°.

[0015] The utility model discloses the obtained beneficial effect is as follows:

[0016] 1. The utility model provides a kind of for long pipeline engineering pipe jacking prefabricated top-down working well, using the method of precast lock mouth ring piece and well wall ring piece, field assembly construction, by top-down method construction, from top to bottom layer excavation foundation pit and assemble working well, finally pour concrete and seal bottom, can reduce field construction time and cross operation, reduce foundation pit excavation amount and influence to environment, improve the construction quality of working well.

[0017] 2, the outer wall of the lock mouth ring piece and the well wall ring piece of the utility model is a variable cross-section structure. During installation, the construction method of installing the ring piece while excavating is used to fix the circumferential soil side pressure around the foundation pit and the soil resistance itself, which can effectively prevent the foundation pit from collapsing and reduce safety hazards.

[0018] 3, the lock mouth ring piece and the well wall ring piece of the utility model are designed with modular prefabrication. The quality of the ring piece is easy to control, and it is convenient for transportation and on-site installation. After pipe jacking construction is completed, the ring piece can be reused by removing the connecting bolts, improving construction efficiency and reducing construction cost.

[0019] 4, the utility model adopts a bevel design on the splicing surface of the ring piece, and combines a multiple waterproof structure of sealing plate and waterstop, which improves the sealing performance of the joint, effectively prevents groundwater from seeping into the working well, and improves the stability and reliability of the working well during use. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of the utility model embodiment for long pipeline engineering pipe jacking prefabricated top-down working well is provided.

[0021] Figure 2 A schematic diagram of the lock mouth ring piece structure of the utility model embodiment for long pipeline engineering pipe jacking prefabricated top-down working well is provided.

[0022] Figure 3 A schematic diagram of the well wall ring piece structure of the utility model embodiment for long pipeline engineering pipe jacking prefabricated top-down working well is provided.

[0023] Figure 4 A schematic diagram of the connecting bolt structure of the utility model embodiment for long pipeline engineering pipe jacking prefabricated top-down working well is provided.

[0024] Figure 5 A horizontal joint and vertical joint waterproof structure diagram of the utility model embodiment for long pipeline engineering pipe jacking prefabricated top-down working well is provided.

[0025] Figure 6 A schematic diagram of the well bottom plate and well wall section connection structure of the utility model embodiment for long pipeline engineering pipe jacking prefabricated top-down working well is provided.

[0026] Figure 7 The first section foundation pit excavation profile drawing of the pipe jacking prefabricated reverse construction working well for long pipeline engineering is provided for the embodiment of the utility model;

[0027] Figure 8 The first section lock mouth ring piece installation schematic drawing of the pipe jacking prefabricated reverse construction working well for long pipeline engineering is provided for the embodiment of the utility model;

[0028] Figure 9 The second section foundation pit excavation profile drawing of the pipe jacking prefabricated reverse construction working well for long pipeline engineering is provided for the embodiment of the utility model;

[0029] Figure 10 The second section well wall ring piece installation schematic drawing of the pipe jacking prefabricated reverse construction working well for long pipeline engineering is provided for the embodiment of the utility model.

[0030] In the drawing: 1, lock mouth section; 11, lock mouth ring piece; 2, well wall section; 21, well wall ring piece; 3, well bottom plate; 31, embedded joint plate; 32, foam stick; 4, vertical joint; 5, horizontal joint; 6, waterproof structure; 61, butyl rubber plate; 62, water stop groove; 63, rubber sealing strip; 64, sponge strip; 65, sealing glue; 7, screw rod; 71, nut; 72, slot hole; 8, first section foundation pit; 9, second section foundation pit. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] It should be pointed out that according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operation of the steps / components can be combined into a new step / component to achieve the purpose of the utility model.

[0033] Embodiment one:

[0034] As Figure 1As shown, the utility model provides a kind of for long pipeline engineering pipe jacking prefabricated top-down working well, the working well is composed of multilayer well section, from top to bottom respectively are locking section 1, well wall section 2 and well bottom plate 3, the basic unit of the locking section 1 and well wall section 2 is prefabricated ring piece, and the well bottom plate 3 is formed by cast-in-place;Locking section 1 is provided with a layer, is assembled by locking ring piece 11, well wall section 2 is provided with multiple layers, is assembled by well wall ring piece 21 staggered joint, and the adjacent ring piece is fixed by connecting piece;The assembly joint of the ring piece in the well section of same layer is vertical seam 4, and the assembly joint between the well section of different layers is horizontal seam 5, and waterproof structure 6 is equipped at vertical seam 4 and horizontal seam 5;The outer wall of locking ring piece 11 and well wall ring piece 21 is variable cross-section structure, can be fixed using circumferential earth body side pressure around foundation pit and earth body resistance.The working well provided by the utility model adopts the construction method of advance prefabrication, field assembly, is constructed by top-down layer-by-layer excavation foundation pit and assembly working well, without need of slope when excavating foundation pit, reduces operation amount and influence to ground surface environment, improves the construction quality of working well.

[0035] In the embodiment, in order to facilitate transportation and on-site construction, the height of the working well locking section 1 and the well wall section 2 is controlled to be 1-1.5 m, each layer of well section is divided into 12 ring pieces, and the arc angle of a single ring piece is 30°. The ring piece is a reinforced concrete structure, which is prefabricated and produced in a modular manner in a factory to ensure that the quality of each ring piece meets the design requirements. The working well adopts a staggered joint assembly method between the well sections of each layer, and the vertical seams 4 of the upper and lower well sections are arranged staggered, which optimizes the stress performance of the working well and improves the overall stability of the working well.

[0036] In the embodiment, as shown in Figure 2 and Figure 3 The upper and lower surfaces of the locking ring piece 11 and the well wall ring piece 21 are flat surfaces, and the outer wall adopts a variable cross-section structure design. The cross-section of the locking ring piece 11 adopts a concave structure with a wide upper and lower part and a narrow middle part, and the outer wall is arc-shaped concave along the circumferential direction. The cross-section of the well wall ring piece 21 adopts a trapezoidal structure with a narrow upper end and a wide lower end, and the outer wall bottom end gradually expands outward. This variable cross-section design enables the ring piece to be fixed using the circumferential earth body side pressure around the foundation pit and the earth body resistance, which can effectively prevent the foundation pit from collapsing during construction and reduce the construction safety hazards.

[0037] In the embodiment, as shown in Figure 4As shown, the locking ring piece 11 and the well wall ring piece 21 are fixed by the connecting piece when splicing, and the connecting piece is specifically a screw rod 7 and a nut 71. The locking ring piece 11 and the well wall ring piece 21 are provided with at least two circular-arc-shaped grooves 72 on each splicing surface, one end of the groove 72 is opened on the inner wall of the ring piece, and the other end extends from the inside of the ring piece to the splicing surface. When the ring pieces are spliced, the grooves 72 of different ring pieces are corresponded to each other, then the screw rod 7 is inserted into the groove 72, and then the nut 71 is sleeved on both ends of the screw rod 7, so that the splicing of the ring pieces is realized. After the ring pieces are spliced, the mouth of the groove 72 is closed on the inner wall with sealing mortar to prevent water leakage. After the pipe jacking construction is completed, the screw rod 7 and the nut 71 can be disassembled to recycle the ring pieces, so that the ring pieces can be reused, which improves the construction efficiency and reduces the engineering cost.

[0038] In this embodiment, as shown in Figure 5 In order to maintain the sealing property of the working well and prevent underground water from seeping in, a waterproof structure 6 is arranged at the vertical seam 4 and the horizontal seam 5 of the ring piece. The waterproof structure 6 includes an elastic sealing plate and an elastic water stop strip. The sealing plate is made of a 2mm-thick nitrile soft rubber plate 61, which is pressed between the contact surfaces of the ring pieces during installation. The compressed nitrile soft rubber plate 61 can reduce the collision between the ring pieces and fill the tiny gaps. The water stop strip is a rubber sealing strip 63, and a strip-shaped water stop groove 62 is arranged on the ring piece, and the rubber sealing strip 63 is installed in the water stop groove 62. The nitrile soft rubber plate 61 and the rubber sealing strip 63 form a multiple waterproof structure 6, which guarantees the waterproof performance of the working well.

[0039] In this embodiment, as shown in Figure 6 The locking section 1 and the well wall section 2 of the working well are spliced by prefabricated ring pieces, and the well bottom plate 3 is formed by in-situ pouring of concrete. The well bottom plate 3 is arranged separately from the well wall section 2, which facilitates the subsequent direct recycling of the locking ring piece 11 and the well wall ring piece 21. The well bottom plate 3 and the well wall section 2 are separated by a caulking plate 31, and a filling material, preferably a polyethylene foam rod 32, is arranged in the gap, and a sealant 65 is coated outside the gap to ensure the sealing property of the well bottom of the working well.

[0040] In this embodiment, as shown in Figures 7-10 The construction process of the working well is as follows:

[0041] S1, make preparation for the working well construction, prefabricate the corresponding number of locking ring pieces 11 and well wall ring pieces 21 in the factory according to the design requirements, and transport them to the construction site.

[0042] S2, the site is leveled and reinforced before construction to ensure a good construction environment, then the first section of the foundation pit 8 is excavated, the depth of the first section of the foundation pit 8 is equal to the height of the locking ring 11; the excavation of the foundation pit is a combination of mechanical and manual methods, the central circular area is excavated by machine first, and then the shape of the edge is trimmed by hand to match the outer wall of the locking ring 11; after the first section of the foundation pit 8 is excavated, mortar can be applied to the surface of the foundation pit to improve the bearing capacity.

[0043] S3, the locking ring 11 of the first section of the well section is installed in place by on-site hoisting, then the screw rod 7 and the nut 71 are installed, the locking ring 11 is connected and fixed as a whole to form a complete locking section 1.

[0044] S4, continue to excavate the second section of the foundation pit 9 by a combination of mechanical and manual methods, the excavation depth of the second section of the foundation pit 9 is equal to the height of the well wall ring 21, then the well wall ring 21 of the second section of the well section is hoisted into place, the horizontal joint 5 between the upper locking ring 11 and the lower well wall ring 21 is fixed with a connecting piece, and then the vertical joint 4 between the well wall rings 21 is fixed with a connecting piece, so that the first layer of the well section and the second layer of the well section are connected as a whole.

[0045] S5, repeat step S4, excavate the foundation pit layer by layer from top to bottom, and assemble the remaining well wall section 2 of the working well, until the design elevation is reached, and then build the concrete well bottom plate 3 to complete the bottom sealing.

[0046] S6, after the main structure of the working well is completed, all the ring joints need to be carefully checked and sealed with sealant 65 to prevent underground water from seeping into the working well.

[0047] S7, after the pipe jacking construction is completed, the screw rod 7 and the nut 71 are removed, the rings are recycled, and the concrete poured well bottom plate 3 can be directly backfilled and buried to restore the ground function.

[0048] In this embodiment, the foundation pit is excavated by a combination of mechanical and manual methods, and is constructed layer by layer in the order from top to bottom, one layer of foundation pit is excavated, after the well section is assembled, the next layer of foundation pit is excavated and the next layer of well section is assembled, and the process is repeated until the design elevation is reached. Avoid the slope design in the traditional excavation of foundation pit, not only reduce the engineering quantity, reduce the influence on the ground environment, but also effectively prevent the collapse of the foundation pit and reduce the safety hidden danger.

[0049] Example Two:

[0050] This embodiment includes all the contents of Example One and adds the following contents.

[0051] The locking ring piece 11 and the well wall ring piece 21 are provided with a bevel at the inner wall and outer wall edges of the splicing surface, and sponge strips 64 are filled in the bevel when the ring pieces are spliced, and sealing glue 65 is coated outside the sponge strips 64. The double waterproof structure 6 combining the sealing plate and the waterstop strip improves the sealing performance of the joint, can effectively prevent groundwater from seeping into the working well, and ensures the stability and reliability of the working well during use.

[0052] The embodiments described above are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

Claims

1. A pipe jacking precast top-down working well for long distance pipeline engineering, characterized in that: The working well is composed of multiple well sections from top to bottom, including a locking section, a well wall section and a well bottom plate, the basic units of the locking section and the well wall section are prefabricated ring pieces, and the well bottom plate is formed by cast-in-place; the locking section is provided with one layer and is assembled by locking ring pieces, the well wall section is provided with multiple layers and is assembled by well wall ring pieces in staggered joints, and adjacent ring pieces are fixed by connecting pieces; the assembly joint of the ring pieces in the same layer of well section is a vertical joint, and the assembly joint of the ring pieces between different layers of well section is a horizontal joint, and the vertical joint and the horizontal joint are both provided with waterproof structures; the outer wall of the locking ring piece and the well wall ring piece is a variable cross-section structure, which can be fixed by the circumferential earth pressure around the foundation pit and the resistance of the earth body itself.

2. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 1, characterized in that: The cross-section of the locking ring piece adopts a concave structure with wide upper and lower parts and narrow middle part, and the outer wall thereof is arc-shaped concave along the circumferential direction; the cross-section of the well wall ring piece adopts a trapezoidal structure with narrow upper end and wide lower end, and the outer wall thereof gradually expands outward at the bottom end.

3. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 1 or 2, characterized in that: The locking ring piece and the well wall ring piece are provided with at least two corresponding circular arc-shaped grooves on each joint surface, one end of the groove is provided on the inner wall of the ring piece, and the other end extends to the joint surface of the ring piece.

4. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 3, characterized in that: The connecting piece includes a threaded stud matched with the groove and a nut, the threaded stud is detachably arranged in the groove, and both ends thereof are fixed by the nut.

5. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 1 or 2, characterized in that: The waterproof structure includes an elastic sealing plate and a water stop strip, the sealing plate is clamped between the joint surfaces of adjacent ring pieces, a water stop groove is provided on the ring piece, and the water stop strip is installed in the water stop groove.

6. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 1 or 2, characterized in that: The locking ring piece and the well wall ring piece are provided with a bevel at the edge of the inner wall and the outer wall of the joint surface, a sponge strip is filled in the bevel when the ring pieces are jointed, and sealing glue is coated outside the joint.

7. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 1 or 2, characterized in that: The well bottom plate and the well wall section are separated by a caulking plate, and a filling material and sealing glue are provided at the gap to prevent water seepage.

8. A pipe jacking precast top-down working well for long distance pipeline engineering according to claim 1 or 2, characterized in that: The height of the locking ring piece and the well wall ring piece is 1-1.5m, and the arc angle is 30°.

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