Construction method for gas pipeline and protection box culvert to penetrate through box culvert

Abstract

The invention discloses a construction method for a gas pipeline external protection crossing box culvert, which comprises the following steps: digging concrete on two inner side walls of a to-be-crossed box culvert, and feeding a protection box culvert into the to-be-crossed box culvert; concrete at the joint of the bottom plate of the rainwater box culvert and the side wall of the protective box culvert is excavated, and steel bars are placed at the joint of the bottom plate of the rainwater box culvert and the side wall of the protective box culvert, at the side wall of the rainwater box culvert and between the side wall of the protective box culvert and the side wall of the to-be-penetrated box culvert and welded to old steel bars; concrete is filled at the joint of the side wall of the protection box culvert and the rainwater box culvert bottom plate and between the side wall of the protection box culvert and the side wall of the to-be-penetrated box culvert; the viscoelastic body and the epoxy glass fiber reinforced plastic are sequentially wrapped outside the surface of the gas pipe; and the space between the protection box culvert and the gas pipe is filled. The new and old reinforcing steel bars can effectively transfer force, the box culvert and the original box culvert are protected to form an effective force transfer path, the bearing capacity of the original box culvert is guaranteed, and corrosion of the steel pipe and mechanical damage to the gas pipe are effectively prevented by forming an anti-corrosion layer and a hardened layer outside the gas pipe through the viscoelastic body and the epoxy glass fiber reinforced plastic.

Description

Technical Field

[0001] The invention relates to the technical field of gas pipe construction, and in particular to a construction method for a gas pipeline with an external protection box culvert passing through a box culvert. Background Art

[0002] With the promotion and popularization of natural gas, a clean energy, the construction of urban gas pipelines has been accelerated, and the mileage of urban gas pipelines has increased day by day. In recent years, in order to solve the increasingly serious problem of urban waterlogging, major cities have carried out large-scale water supply and drainage network transformation, and built many large drainage culverts, occupying a large amount of urban underground space. As a result, the location conflict between the existing underground gas pipelines and the newly built drainage culverts has become increasingly serious.

[0003] The existing gas pipes passing through the box culvert are generally protected by steel casing, that is, a new steel casing is added outside the box culvert where the gas pipe passes through. However, this solution has the following problems:

[0004] (1) Weakening the bearing capacity of the box culvert. In the existing method of crossing, a hole is generally opened directly in the side wall of the box culvert, and the diameter of the hole is about 1 / 8 to 1 / 3 of the height of the side wall of the box culvert, which seriously weakens the bearing capacity of the box culvert.

[0005] (2) Gas pipelines are prone to corrosion in box culverts, which shortens the service life of gas pipelines. When steel pipes are used for gas pipelines, the steel pipes are easy to lay due to the high humidity and air inside the box culvert. Even if anti-corrosion measures are adopted, the anti-corrosion layer is easily damaged due to long-term drainage and erosion of debris in the water, resulting in anti-corrosion failure. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a construction method for a gas pipeline with an additional protective box culvert passing through a box culvert, which does not weaken the bearing capacity of the original box culvert and can avoid corrosion of the gas pipeline.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: a construction method for a gas pipeline with an additional protection box culvert passing through a box culvert, comprising the following steps:

[0008] S1. Excavate the concrete on both inner walls of the box culvert to be crossed, and put the protective box culvert into the box culvert to be crossed;

[0009] S2. Excavate the concrete at the junction of the bottom plate of the rainwater culvert and the side wall of the protective culvert, and put steel bars at the junction of the bottom plate of the rainwater culvert and the side wall of the protective culvert and the side wall of the rainwater culvert, and weld the steel bars to the old steel bars of the rainwater culvert;

[0010] S3. Place steel bars between the side wall of the protective box culvert and the side wall of the box culvert to be crossed, and weld the steel bars to the old steel bars of the box culvert to be crossed;

[0011] S4. Fill concrete between the junction of the protective box culvert side wall and the bottom plate of the rainwater box culvert, and between the protective box culvert side wall and the side wall of the box culvert to be crossed;

[0012] S5. Wrap the surface of the gas pipe with viscoelastic body and epoxy fiberglass in order from inside to outside;

[0013] S6. Fill the gap between the protective box culvert and the gas pipe.

[0014] Furthermore, in S1, before excavating the two side walls of the box culvert to be crossed, it is also necessary to lay concrete brick molds on the outer sides of the two side walls of the box culvert to be crossed.

[0015] Furthermore, the specific operation of implanting the steel bars in S2 is:

[0016] Add vertical steel bars at the side wall of the protective culvert and the bottom plate of the rainwater culvert, and bend the end of the vertical steel bars close to the rainwater culvert and implant them into the bottom plate of the rainwater culvert;

[0017] Add vertical and horizontal steel bars to the side walls of the rainwater culvert.

[0018] Furthermore, the specific operation of implanting steel bars in S3 is:

[0019] Vertical steel bars and horizontal steel bars are added between the side wall of the protective box culvert and the side wall of the box culvert to be crossed, and both ends of the vertical steel bars and the horizontal steel bars are bent, and one side bent end of the vertical steel bar can be embedded in the bottom plate of the rainwater box culvert.

[0020] Furthermore, S2 and S3 are connected to the old steel bars by double-sided welding.

[0021] Furthermore, in S4, expansive concrete is used.

[0022] Furthermore, in S6, fine sand is used for filling, and the space between the gas pipe and the protective box culvert is filled in layers.

[0023] Furthermore, it also includes:

[0024] S7. Set a cement mortar conical slope on the outside of the concrete brick mold.

[0025] The beneficial effects of the present invention are embodied in:

[0026] The construction method of the gas pipeline additional protection box culvert crossing box culvert of the present invention is to implant new steel bars between the protection box culvert and the rainwater box culvert, and between the protection box culvert and the box culvert to be crossed, and weld them with the original structural steel bars, so that the new and old steel bars are firmly connected. In the subsequent use process, the new and old steel bars can effectively transmit force, so that the newly built gas protection box culvert and the existing box culvert form an effective force transmission path, and by implanting steel bars, the steel bars of the new structure and the concrete of the old structure have sufficient bond strength, so that the newly added structural steel bars and the old concrete can be firmly combined, and can achieve common force in the subsequent use without weakening the bearing capacity of the original box culvert;

[0027] By setting a viscoelastic body on the outside of the gas pipe as the main anti-corrosion measure for the gas pipe, the gas pipe is prevented from contacting with water and air; then an additional epoxy fiberglass protection is added outside the viscoelastic body to form a hardened layer on the gas pipe, which to a certain extent prevents possible mechanical damage to the gas pipe during subsequent construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the process of the construction method of the additional protection box culvert crossing the box culvert of the present invention;

[0029] Figure 2 It is a front cross-sectional view of the construction process of the additional protection box culvert crossing the box culvert of the present invention.

[0030] The components in the attached figure are marked as follows: 1. box culvert to be crossed; 2. protection box culvert; 3. rainwater box culvert; 4. masonry concrete brick mold; 5. gas pipe; 6. cement mortar conical slope. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 2 ,

[0033] The present invention provides a construction method for a gas pipeline with an external protection box culvert passing through a box culvert, comprising the following steps:

[0034] S1. Excavate the concrete on both inner walls of the box culvert 1 to be crossed, and send the protective box culvert 2 into the box culvert 1 to be crossed;

[0035] S2. Excavate the concrete at the junction of the bottom plate of the rainwater culvert 3 and the side wall of the protective culvert 2, and put steel bars at the junction of the bottom plate of the rainwater culvert 3 and the side wall of the protective culvert 2 and the side wall of the rainwater culvert 3, and weld the steel bars to the old steel bars of the rainwater culvert 3; in this step, the excavation position is Figure 1 The marked A section has an excavation width of approximately 500mm on each side and an excavation depth of 50mm.

[0036] S3. Place steel bars between the side wall of the protective box culvert 2 and the side wall of the box culvert 1 to be crossed, and weld the steel bars to the old steel bars of the box culvert 1 to be crossed;

[0037] S4. Fill concrete between the junction of the side wall of the protection box culvert 2 and the bottom plate of the rainwater box culvert 3, and between the side wall of the protection box culvert 2 and the side wall of the box culvert 1 to be crossed;

[0038] S5. Wrap the surface of the gas pipe 5 with a viscoelastic body and epoxy fiberglass in order from the inside to the outside; it should be noted that this step only needs to be arranged before S6.

[0039] S6. Fill the gap between the protection box culvert 2 and the gas pipe 5. It should be noted that the gas pipe 5 is already located in the protection box culvert 2 in advance.

[0040] The construction method of the gas pipeline additional protection box culvert crossing box culvert of the present invention is to make the new and old steel bars firmly connected by welding the newly implanted steel bars between the protection box culvert 2 and the rainwater box culvert 3 and between the protection box culvert 2 and the box culvert to be crossed 1 with the original structural steel bars. In the subsequent use process, the new and old steel bars can effectively transmit force, so that the newly built gas protection box culvert 2 and the existing box culvert form an effective force transmission path, and by implanting steel bars, the steel bars of the new structure and the concrete of the old structure have sufficient bond strength, so that the newly added structural steel bars and the old concrete can be firmly combined, and can achieve common force in the subsequent use without weakening the bearing capacity of the original box culvert;

[0041] By setting a viscoelastic body on the outside of the gas pipe 5 as the main anti-corrosion measure for the gas pipe 5, the gas pipe 5 is in contact with water and air; then an additional epoxy fiberglass protection is added outside the viscoelastic body to form a hardened layer on the gas pipe 5, which to a certain extent prevents the gas pipe 5 from being mechanically damaged during the subsequent construction process.

[0042] In one embodiment, in S1, before the two side walls of the box culvert 1 to be traversed are excavated, a concrete brick mold 4 is also required to be built on the outer side of the two side walls of the box culvert 1 to be traversed. In this design, the side walls of the box culvert 1 to be traversed are supported by building a concrete brick mold 4, which reduces the damage to the original structure caused by the construction work during the construction process, and the deformation caused by the construction work, and protects the original structure to a certain extent; on the other hand, it can be used as a template for the new structure to facilitate the pouring construction;

[0043] The width of the two side walls of the box culvert 1 to be crossed is about 1.8m, the thickness of the concrete brick mold is 120mm, and the brick wall blocks are made of sintered bricks MU10.

[0044] In one embodiment, the specific operation of implanting the steel bars in S2 is:

[0045] Add new vertical steel bars at the side wall of the protection box culvert 2 and the bottom plate of the rainwater box culvert 3, and bend the end of the vertical steel bars close to the rainwater box culvert and implant them into the bottom plate of the rainwater box culvert 3;

[0046] New vertical and horizontal steel bars are added to the side wall of the rainwater culvert 3. The new vertical and horizontal steel bars are Φ8, and the horizontal and vertical spacing of the formed steel mesh is 150mm.

[0047] In one embodiment, the specific operation of implanting the steel bars in S3 is:

[0048] Vertical and horizontal steel bars are added between the side wall of the protection box culvert 2 and the side wall of the box culvert 1 to be crossed, and both ends of the vertical and horizontal steel bars are bent, and the bent end of one side of the vertical steel bar can be embedded in the bottom plate of the rainwater box culvert 3. The newly added steel bars are Φ8, and the spacing between adjacent steel bars is 150mm, which is not less than 150mm embedded in the original structure.

[0049] In one embodiment, S2 and S3 are connected to the old steel bars by double-sided welding. In this embodiment, the welding length between the steel bars and the old steel bars is 100 mm. This design facilitates the connection between the new steel bars and the old steel bars to achieve effective force transmission.

[0050] In one embodiment, in S4, expansive concrete is used. With this design, the concrete can have a certain micro-expansion after solidification, avoiding the self-shrinkage characteristics of general concrete, which leads to cracks between new and old concrete, and the poured concrete forms a protection on the outside of the existing gas pipe 5 protection box culvert 2, ensuring that the internal gas pipeline is not subjected to external loads, effectively reducing the possibility of pipeline deformation and damage, and C40 expansive concrete is selected.

[0051] In one embodiment, in S6, fine sand is used for filling, and the space between the gas pipe 5 and the protection box culvert 2 is filled in layers. With this design, the gas pipe 5 is fixed in the protection box culvert 2 by fine sand, and the accumulation of gas leakage after the gas pipeline is damaged can be avoided. In addition, before filling, sufficient space is reserved between the gas pipe 5 and the protection box culvert 2, the distance between the gas pipe 5 and the side wall is 300 mm, and the distance between the gas pipe 5 and the top plate is 100 mm, so that the subsequent replacement of the gas pipeline becomes possible.

[0052] In one embodiment, it further includes:

[0053] S7. A cement mortar tapered slope 6 is arranged outside the masonry concrete brick mold 4. The cement mortar tapered slope 6 has a waterproof effect on one hand, reducing the corrosion effect of water on the steel bars in the protection box culvert 2, and on the other hand, reducing the water blocking effect of the reinforced concrete protection box culvert 2 on the water flow, and the slope of the tapered slope is 1:1.

[0054] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0055] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A construction method for a gas pipeline with additional protection passing through a box culvert, characterized in that: The following steps are involved: S1. Excavate the concrete on both inner walls of the box culvert (1) to be crossed, and send the protective box culvert (2) into the box culvert (1) to be crossed; S2. Excavate the concrete at the junction of the bottom plate of the rainwater culvert (3) and the side wall of the protective culvert (2), and put steel bars at the junction of the bottom plate of the rainwater culvert (3) and the side wall of the protective culvert (2) and the side wall of the rainwater culvert (3), and weld the steel bars to the old steel bars of the rainwater culvert (3); S3. Place steel bars between the side walls of the protective box culvert (2) and the side walls of the box culvert to be crossed (1), and weld the steel bars to the old steel bars of the box culvert (1); S4. Fill the junction between the side wall of the protective box culvert (2) and the bottom plate of the rainwater box culvert (3), and between the side wall of the protective box culvert (2) and the side wall of the box culvert to be crossed (1) with concrete; S5. The surface of the gas pipe (5) is wrapped with a viscoelastic body and epoxy fiberglass from the inside to the outside; S6. Fill the gap between the protective box culvert (2) and the gas pipe (5).

2. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 1 is characterized in that: In S1, before excavating the two side walls of the box culvert (1) to be traversed, it is also necessary to lay concrete brick molds (4) on the outer sides of the two side walls of the box culvert (1) to be traversed.

3. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 1 is characterized in that: The specific operation of implanting steel bars in S2 is: Adding vertical steel bars at the side wall of the protection box culvert (2) and the bottom plate of the rainwater box culvert (3), and bending one end of the vertical steel bars close to the rainwater box culvert and implanting them into the bottom plate of the rainwater box culvert (3); Additional vertical and horizontal reinforcements are provided on the side walls of the rainwater culvert (3).

4. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 1 is characterized in that: The specific operation of implanting steel bars in S3 is: Vertical steel bars and horizontal steel bars are added between the side wall of the protection box culvert (2) and the side wall of the box culvert to be crossed (1), and both ends of the vertical steel bars and the horizontal steel bars are bent, and one side of the bent end of the vertical steel bar can be embedded in the bottom plate of the rainwater box culvert (3).

5. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 1 is characterized in that: S2 and S3 are connected to the old steel bars by double-sided welding.

6. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 1 is characterized in that: In S4, expansive concrete is used.

7. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 1 is characterized in that: In S6, fine sand is used for filling, and the space between the gas pipe (5) and the protection box culvert (2) is filled in layers.

8. The construction method for a gas pipeline with additional protection passing through a box culvert according to claim 2 is characterized in that: Also includes: S7. A cement mortar conical slope (6) is provided on the outside of the concrete brick mold (4).

Images