A method for constructing a subgrade culvert foundation underpinning

Abstract

This invention discloses a method for underpinning culvert foundations in roadbeds, relating to the field of civil engineering technology. The method includes the following steps: cleaning the culvert to expose the culvert foundation; installing support components on both sides of the culvert foundation to support the cover plate; breaking the bottom slab in the middle of the culvert and re-pouring reinforced concrete at the bottom slab location; installing support components on the re-pouring reinforced concrete to support the cover plate; breaking the bottom slabs on both sides of the culvert and under the support walls, and then re-pouring reinforced concrete to replace the original bottom slabs; after the re-pouring reinforced concrete reaches its design strength, removing the support components inside the culvert to restore its drainage function. The aforementioned method for underpinning culvert foundations is applicable to natural foundation underpinning of frame structures. During the underpinning process, the building can be used normally without speed restrictions, which helps reduce the impact of the underpinning on the surrounding area.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a method for underpinning the foundation of roadbeds and culverts. Background Technology

[0002] Rail transit boasts advantages such as large capacity, high speed, punctuality, and safety. As a vital link connecting cities, rail transit projects play a significant role in the transformation of urban spatial structure. Due to urban planning and other related reasons, tunnel construction inevitably involves passing under or alongside important buildings and structures, such as bridges, buildings, and roadbeds. In the past, to ensure the construction safety and stability of new underground projects during their subsequent use, the roadbeds and culverts that the tunnel passes through were usually directly excavated and demolished. However, this method has many drawbacks, such as large excavation workload, long construction period, limited working space, construction difficulties, and dangerous construction processes, causing significant challenges to design and construction. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a method for underpinning culvert foundations. By casting concrete in place at the location of the original base slab, part of the foundation, and part of the supporting wall as the underpinning base slab, the roadbed culvert foundation is underpinned. During the underpinning construction, a support assembly is used to transfer the vertical load of the roadbed culvert during foundation underpinning, which can effectively reduce the amount of work and shorten the construction period.

[0004] The method for underpinning the foundation of a culvert in this invention includes the following steps: S110: Clean the culvert to expose its structural foundation; S120: Install support components on the structural foundations on both sides of the culvert to support the cover plate; S130: Remove the bottom slab in the middle of the culvert and recast reinforced concrete at the location of the bottom slab, the recast reinforced concrete forming the underpinning bottom slab; S140: Install support components on the recast reinforced concrete to support the cover plate; S150: Remove the bottom slabs on both sides of the culvert and under the support wall, and then recast reinforced concrete as the underpinning bottom slab to replace the original bottom slab; S160: After the recast reinforced concrete reaches its design strength, remove the support components inside the culvert to restore the culvert's drainage function.

[0005] According to the roadbed culvert foundation underpinning construction method of the present invention, in step S110, the diversion work within the culvert area should be carried out.

[0006] According to the roadbed culvert foundation underpinning construction method of the present invention, the support component includes uprights and adjustable top supports. There are multiple uprights arranged at intervals, and the upper end of each upright is provided with the adjustable top support, which is used to support the cover plate.

[0007] According to the roadbed culvert foundation underpinning construction method of the present invention, the uprights are steel pipes, and the longitudinal spacing between two adjacent steel pipes is 0.5m.

[0008] According to the roadbed culvert foundation replacement construction method of the present invention, the support component further includes square timber, which is installed on the adjustable top support and is used to support the cover plate.

[0009] According to the roadbed culvert foundation replacement construction method of the present invention, in step S130, when part of the structural foundation and bottom slab of the culvert is broken along the longitudinal direction of the culvert and the reinforced concrete is re-poured, the conditions for rebar splicing are reserved to ensure that the cast-in-place reinforced concrete and the structural foundation overlap each other.

[0010] According to the roadbed culvert foundation underpinning construction method of the present invention, in step S140, after the strength of the cast-in-place reinforced concrete reaches 80% of the design strength, the existing support components are removed, and the removed support components are installed on the newly poured concrete to support the cover plate.

[0011] According to the roadbed culvert foundation underpinning construction method of the present invention, in step S150, the supporting wall and roadbed culvert foundation within the underpinning base plate area are removed by manual demolition.

[0012] According to the roadbed culvert foundation underpinning construction method of the present invention, after tying the reinforcing bars within the remaining underpinning base plate area, the reinforced concrete within the underpinning base plate area is poured. Only when the strength of the cast-in-place reinforced concrete reaches the design strength can the next cycle of construction begin.

[0013] According to the roadbed culvert foundation underpinning construction method of the present invention, the advance length of each cycle along the longitudinal direction of the culvert is 1 meter.

[0014] The aforementioned method for replacing culvert foundations has at least the following advantages: During construction, the middle section of the original base slab is first removed and reinforced concrete is re-poured. Then, support components are installed on the newly poured reinforced concrete to support the cover plate. Next, the base slabs on both sides of the culvert and at the bottom of the support walls are removed and re-poured with reinforced concrete. The re-poured reinforced concrete overlaps to form the replacement base slab, thus achieving the purpose of replacing the culvert foundation. This method is suitable for replacing natural foundations in frame structures, effectively reducing the amount of construction work and shortening the construction period. During the culvert foundation replacement construction, the building can be used normally without speed limits, which helps reduce the impact of the culvert foundation replacement construction on the surrounding area.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of a culvert and tunnel according to one embodiment of the present invention, wherein the bottom plate shown is the new bottom plate after the foundation replacement;

[0018] Figure 2 for Figure 1 A diagram from another angle;

[0019] Figure 3 This is a construction schematic diagram of breaking the bottom slab in the middle of the culvert in an embodiment of the present invention;

[0020] Figure 4 This is a construction diagram illustrating the re-pouring of reinforced concrete at the bottom slab location in the middle of the culvert, as described in an embodiment of the present invention.

[0021] Figure 5 This is a construction diagram illustrating the removal of the two side slabs of the cast-in-place reinforced concrete in an embodiment of the present invention;

[0022] Figure 6 This is a construction schematic diagram of installing support components on cast-in-place reinforced concrete in an embodiment of the present invention;

[0023] Figure 7 This is a construction schematic diagram of breaking the bottom slab on both sides of the culvert and under the supporting wall in an embodiment of the present invention;

[0024] Figure 8 This is a construction diagram illustrating the recasting of the bottom slabs on both sides of the culvert in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of one implementation process of the roadbed and culvert foundation underpinning construction method according to an embodiment of the present invention.

[0026] Figure label:

[0027] 1. Tunnel;

[0028] 100. Culvert; 111. Bottom slab; 112. Original bottom slab location; 113. Replacement bottom slab; 120. Cover plate; 130. Supporting wall; 140. Structural foundation;

[0029] 210. Erecting poles. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0034] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] This invention discloses a method for underpinning culvert foundations in roadbeds, which includes the following steps:

[0036] S110: Clear culvert 100 to expose the structural foundation 140 of culvert 100. For details, see [link to relevant documentation]. Figure 3 As shown, before construction, the diversion work within the culvert 100 area should be carried out, and then the silt and other related debris inside the culvert 100 should be cleared, so that the structural foundation 140 of the culvert 100 is exposed.

[0037] S120: Support components are installed on the structural foundations 140 on both sides of the culvert 100 to support the cover plate 120. See details below. Figure 3 As shown, one end of the support component is installed on the structural foundation 140 of the culvert 100, which can effectively prevent the support component from sinking or tilting, thereby ensuring the safety of construction. At the same time, setting the support component on the structural foundation 140 of the culvert 100 and using the support component to support the cover plate 120 can effectively simplify the installation and fixing structure of the support component, thereby greatly improving construction efficiency.

[0038] S130: Demolish the bottom slab 111 in the middle of culvert 100 and recast reinforced concrete at the location of bottom slab 111. For details, see [link to details]. Figure 4 and Figure 5 As shown, a portion of the structural foundation 140 and bottom slab 111 of the culvert 100 are demolished longitudinally using a manual demolition method. When demolishing the old bottom slab 111, it should be ensured that the cast-in-place reinforced concrete can overlap with the structural foundation 140 to effectively reduce the settlement of the cast-in-place reinforced concrete. When re-pouring reinforced concrete at the location after demolishing the bottom slab 111, the conditions for reserving the reinforcement overlap should be met so that the cast-in-place reinforced concrete can overlap with the remaining reinforced concrete to be poured.

[0039] S140: A support assembly is installed on the cast-in-place reinforced concrete to support the cover plate 120. See also Figure 6 As shown, after the cast-in-place reinforced concrete reaches 80% of its design strength, the support components are then placed on the cast-in-place reinforced concrete to improve the utilization rate of the support components. The connection method of the support components is set in accordance with step S120.

[0040] S150: Remove the bottom slab 111 on both sides of the culvert 100 and under the supporting wall 130, and then recast reinforced concrete as a replacement bottom slab 113 to replace the original bottom slab 111. For details, see [link to details]. Figure 7 As shown, when supporting the base slab 111 under the supporting wall 130, it should be ensured that the replacement base slab 113 and the structural foundation 140 have a certain overlap and meet the conditions for the reserved reinforcement lap. After removing the original base slab 111, the remaining reinforcement within the foundation replacement range is tied at the original base slab position 112, and the reinforced concrete within the foundation replacement range is poured. The next cycle of construction can only begin when the strength of the cast-in-place reinforced concrete reaches the design strength. Furthermore, along the longitudinal direction of the culvert 100, the advance length of each cycle is 1 meter to avoid significant settlement of the cover slab 120.

[0041] In step S150, the supporting wall 130 and structural foundation 140 within the range of the culvert base 113 are removed by manual demolition. When demolishing the base 111 under the culvert supporting wall 130, it should be ensured that the cast-in-place reinforced concrete and the structural foundation 140 have a certain overlap and meet the conditions for the reserved reinforcement overlap, so as to ensure that the cast-in-place reinforced concrete can be fully connected with the original supporting wall 130 and structural foundation 140.

[0042] S160: After the cast-in-place reinforced concrete reaches the design strength, remove the supporting components inside culvert 100 and restore the drainage function of culvert 100.

[0043] It should be understood that, along the longitudinal direction of culvert 100, culvert 100 is divided into multiple cyclic units of a certain length. When carrying out the roadbed culvert foundation underpinning construction, each cyclic unit is constructed in sequence according to the aforementioned steps. After the construction of one cyclic unit is completed, the construction of the next cyclic unit is carried out until the foundation underpinning work of the entire culvert 100 is completed.

[0044] During construction, the middle section of the original base slab 111 is first demolished and reinforced concrete is re-poured. Support components are then installed on the cast-in-place reinforced concrete, which has reached the design strength, to provide support for the cover plate 120. Next, the base slabs 111 on both sides of the culvert 100 and at the bottom of the support wall 130 are demolished and reinforced concrete is re-poured. The re-poured reinforced concrete overlaps to form a new base slab 111, thus achieving the purpose of replacing the culvert foundation. The aforementioned method for replacing culvert foundations is applicable to the natural foundation replacement of frame structures. During the construction of the culvert foundation replacement, the building can be used normally without the need for speed limits, which helps to reduce the impact of the culvert foundation replacement on the surrounding area.

[0045] In some embodiments, see Figures 3 to 8 As shown, the support assembly includes uprights 210 and adjustable top supports (not shown). Multiple uprights 210 are spaced apart, and each upright 210 has an adjustable top support at its upper end. These adjustable top supports support the cover plate 120. The adjustable top supports can change their height, ensuring that each support and each upright 210 can effectively support the cover plate 120. Furthermore, the support assembly also includes horizontal bars (not shown), which are arranged horizontally and connected to each upright 210. The horizontal bars can be made of A48mm steel pipe.

[0046] In one embodiment, the uprights 210 are steel pipes with a wall thickness of 3mm, and the longitudinal spacing between two adjacent steel pipes is 0.5m. It should be understood that the lateral spacing of the uprights can be determined according to the required support force. For example, the lateral spacing between two adjacent uprights 210 can be set to 600mm or 700mm. It should be noted that the aforementioned longitudinal direction refers to the length direction of the culvert 100.

[0047] In some embodiments, the support assembly further includes a square timber (not shown in the figure), which is mounted on an adjustable top support and is used to support the cover plate 120. The square timber is inserted into the adjustable top support to support the cover plate 120. In this embodiment, the square timber can be a 10*10cm block of wood.

[0048] See below. Figures 1 to 9 The method for underpinning culvert foundations of the present invention is described in detail with reference to a specific embodiment. It is important to understand that the following embodiment is merely an exemplary description and should not be construed as limiting the embodiments of the present invention.

[0049] See Figures 1 to 9 As shown, the steps for the construction of roadbed and culvert foundation underpinning are as follows:

[0050] Step 1: Perform drainage within the culvert 100 area, clear silt and other debris from the culvert 100 to expose the structural foundation 140 of the culvert 100; erect A48mm steel pipes as uprights 210 on the existing structural foundation 140, insert 10*10cm square timber into the adjustable top support to support the culvert cover plate 120, and place the bottom of the uprights 210 on the structural foundation 140 of the culvert 100; the longitudinal spacing of the steel pipe supports is 0.5m, and the horizontal bars are connected to the uprights using A48mm steel pipes.

[0051] Step 2: Using manual demolition, part of the structural foundation 140 and bottom slab 111 are demolished longitudinally to ensure that the underpinning bottom slab 113 and the structural foundation 140 have a certain overlap and meet the conditions for the reserved steel reinforcement overlap.

[0052] Step 3: Tie the reinforcing bars of the culvert bottom slab and pour reinforced concrete to support the bottom slab 113.

[0053] Step 4: After the cast-in-place reinforced concrete reaches 80% of its design strength, remove the existing steel pipe supports; adjust the steel pipe supports inside the culvert to the new base slab. The connection method for the steel pipe supports is the same as in Step 1.

[0054] Step 5: Use manual demolition to break down the supporting wall 1330 and structural foundation 140 within the range of the underpinning base plate 113.

[0055] Step Six: After tying the remaining reinforcing bars within the 113-area range of the replacement base slab, pour the reinforced concrete within the 113-area range of the replacement base slab. The next construction cycle can only begin when the reinforced concrete reaches its design strength. Each cycle advances 1m.

[0056] In the aforementioned embodiment, tunnel 1 passes under culvert 100. Using the aforementioned roadbed culvert foundation underpinning construction method can effectively prevent settlement and protect the safety of tunnel 1.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A method for constructing a roadbed culvert foundation underpinning project, characterized in that, Includes the following steps: S110: Clear the culvert to expose its structural foundation; S120: Support components are installed on the structural foundations on both sides of the culvert to support the cover plate; S130: The bottom slab in the middle of the culvert is broken and reinforced concrete is poured again at the original bottom slab position. The re-poured reinforced concrete forms the supporting bottom slab. S140: Install support components on the poured reinforced concrete to support the cover plate; S150: Remove the bottom slab on both sides of the culvert and under the supporting wall, and then recast reinforced concrete as a replacement bottom slab to replace the original bottom slab; S160: After the reinforced concrete to be poured reaches the design strength, remove the supporting components inside the culvert and restore the drainage function of the culvert.

2. The method for underpinning and replacing roadbed culvert foundations according to claim 1, characterized in that, In step S110, it is necessary to carry out diversion work within the culvert area.

3. The method for underpinning and replacing roadbed culvert foundations according to claim 1, characterized in that, The support assembly includes uprights and adjustable top supports. There are multiple uprights spaced apart from each other. Each upright has an adjustable top support at its upper end, which is used to support the cover plate.

4. The method for underpinning roadbed and culvert foundations according to claim 3, characterized in that, The uprights are made of steel pipes, and the longitudinal distance between two adjacent steel pipes is 0.5m.

5. The method for underpinning and replacing roadbed culvert foundations according to claim 3, characterized in that, The support assembly also includes square timber, which is installed on the adjustable top support and is used to support the cover plate.

6. The method for underpinning roadbed and culvert foundations according to claim 1, characterized in that, In step S130, part of the culvert's structural foundation and bottom slab are broken along the longitudinal direction of the culvert; when re-pouring reinforced concrete, conditions for rebar lap splicing are reserved to ensure that the cast-in-place reinforced concrete overlaps with the structural foundation.

7. The method for underpinning and replacing roadbed culvert foundations according to claim 1, characterized in that, In step S140, after the strength of the cast-in-place reinforced concrete reaches 80% of the design strength, the existing support components are removed, and the removed support components are installed on the newly poured concrete to support the cover plate.

8. The method for underpinning roadbed and culvert foundations according to claim 1, characterized in that, In step S150, the supporting walls and structural foundations within the range of the underpinning base plate are removed manually.

9. The method for underpinning and replacing culvert foundations in roadbed according to claim 8, characterized in that, After tying the remaining reinforcing bars within the support base plate area, pour the reinforced concrete within the support base plate area. Only when the strength of the cast-in-place reinforced concrete reaches the design strength can the next construction cycle begin.

10. The method for underpinning and replacing culvert foundations in roadbed according to claim 9, characterized in that, Along the longitudinal direction of the culvert, the advance length of each cycle is 1 meter.

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