Construction method for integral underpinning of lower foundation of masonry wall

Abstract

The invention provides a construction method for overall underpinning of a lower foundation of a masonry wall, frame columns are arranged on the two sides of the span of an original masonry wall, a wall foundation is arranged below the original masonry wall, and the construction method comprises the steps that pre-fixing pieces arranged in the span direction are arranged on the two sides of the thickness direction of the original masonry wall, and pre-fixing pieces are arranged on the two sides of the thickness direction of the original masonry wall; the pre-fixing piece penetrates through a wall and is fixed; an upper support changing piece is installed between the frame column and the pre-fixing piece; and a lower support replacing piece is installed between the wall foundation and the pre-fixing piece. According to the construction method, before the underpinning beam under the wall of the original masonry wall is constructed, pre-fixing pieces are installed on the two sides of the original masonry wall in the thickness direction in advance and penetrate through the wall for fixation, and stability and safety of the masonry structure in the construction process are guaranteed; before large-area grooving, the pre-fixing piece is connected with the frame column through the upper support replacing piece, so that the masonry structure has certain self-bearing capacity, the situation that follow-up slotting influences the stability and safety of the structure, located above the pre-fixing piece, of an original masonry wall is avoided, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of integral underpinning of a foundation under a masonry wall, and in particular to a construction method for integral underpinning of a foundation under a masonry wall. Background Art

[0002] Foundation underpinning under masonry walls is a technical approach designed to solve the problems of foundation treatment and reinforcement of existing buildings, especially when underground space development or new construction is required, to ensure the safe use of existing buildings.

[0003] The existing foundation underpinning under masonry walls has the following defects:

[0004] During the construction process, the upper masonry structure of the masonry wall is greatly disturbed, which affects the stability of the masonry structure and poses certain safety risks, resulting in only basic segmented construction, slow construction speed and low construction efficiency.

[0005] Therefore, in order to solve the above problems, the present invention proposes a construction method for overall underpinning of the foundation under the masonry wall, which can ensure the stability and safety of the upper masonry structure during the construction process and improve the construction efficiency. Summary of the invention

[0006] In order to solve the technical problems existing in the existing underpinning of the foundation under a masonry wall, the present invention provides a construction method for overall underpinning of the foundation under a masonry wall.

[0007] According to one object of the present invention, the present invention provides a construction method for overall underpinning of a foundation under a masonry wall, wherein frame columns are arranged on both sides of the span of the original masonry wall, and a wall foundation is arranged below the original masonry wall, and the construction method comprises:

[0008] Pre-fixed parts are arranged along the span direction on both sides of the original masonry wall in the thickness direction, and the pre-fixed parts are fixed through the wall;

[0009] Installing a replacement support member between the frame column and the pre-fixed member;

[0010] A lower replacement support is installed between the wall foundation and the pre-fixed member, and the lower replacement support is pressed against the original masonry wall above by supporting it;

[0011] Remove all the soil between the pre-fixed parts and the wall foundation of the original masonry wall;

[0012] The soil is excavated to form a supporting beam under the wall.

[0013] Preferably, the specific method for implementing the fixing of the pre-fixed member through the wall includes:

[0014] A first bolt hole connecting the two sides of the original masonry wall in the thickness direction is opened along the thickness direction of the original masonry wall, the number of the first bolt holes is multiple, the first bolt holes are sequentially spaced along the span direction of the original masonry wall, and the pre-fixed member is provided with second bolt holes corresponding to the first bolt holes one by one;

[0015] The fastener is sequentially inserted into the second bolt hole, the first bolt hole and the second bolt hole on another pre-fixed member and fixed.

[0016] Preferably, the method of sequentially inserting the fastener into the second bolt hole, the first bolt hole and the second bolt hole on another pre-fixed member and fixing the fastener comprises:

[0017] The fastener comprises a bolt and a nut, the bolt is sequentially inserted into the second bolt hole, the first bolt hole and the second bolt hole on another pre-fixed member, and the end of the bolt is exposed on a side of the pre-fixed member away from the original masonry wall;

[0018] Nuts are respectively installed on the two ends of the bolt to fix the pre-fixed component on the original masonry wall.

[0019] Preferably, the gap between the first bolt hole and the fastener is sealed by glue filling.

[0020] Preferably, a replacement support member is installed between the frame column and the pre-fixed member, and a specific implementation method thereof includes:

[0021] A first slot is formed by cutting a groove in the original masonry wall, wherein the first slot is located below the pre-fixed member;

[0022] The upper support member includes a lifting member and a tension rod. The lifting member is installed in the first slot body. The lifting member and the pre-fixing member are fixedly connected. One end of the tension rod is connected to the lifting member, and the other end of the tension rod is connected to the frame column.

[0023] Preferably, there are multiple first troughs, and the first troughs correspond to the lifting members one by one. The first troughs are arranged in the middle of the original masonry wall and at a quarter of the original masonry wall span.

[0024] The top end of the first groove body is flush with the bottom end of the pre-fixing member.

[0025] Preferably, the connection position between the tie rod and the frame column is located above the pre-fixed component, and the angle between the tie rod and the horizontal plane is close to 30°.

[0026] Preferably, a lower support member is installed between the wall foundation and the pre-fixed member, and a specific implementation method thereof includes:

[0027] The original masonry wall located below the pre-fixed component is grooved to form a second groove body, wherein the number of the second groove bodies is multiple, and the second groove bodies are sequentially spaced apart along the span direction of the original masonry wall, and the bottom end of the second groove body is flush with the top end of the wall foundation;

[0028] The lower replacement support is installed in the second trough body, and the lower replacement support is pressed against the original masonry wall above by supporting.

[0029] Preferably, if a connecting beam is provided above the wall foundation, a precast concrete slab is laid below the lower support member.

[0030] Preferably, the construction method further comprises casting the lower exchange support member in the under-wall exchange beam.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] In this construction method, before the replacement beam is constructed under the original masonry wall, pre-fixed parts are installed on both sides of the original masonry wall in the thickness direction, the channel steel is fixed through the wall with bolts, and the bolt holes are filled with glue to ensure the stability and safety of the masonry structure during the construction process;

[0033] Before large-scale grooving, the first groove is cut in the middle of the original masonry wall and at a quarter of the span. Lifting pieces are installed at the first groove, and the lifting pieces are connected to the frame columns with tie rods. The lifting pieces and pre-fixed pieces are connected to each other by welding, so that the masonry structure has a certain self-bearing capacity. Therefore, the second groove can be cut at intervals at one time and over a large area at the bottom of the original masonry wall to form a second groove body without affecting the stability and safety of the structure of the original masonry wall above the pre-fixed pieces, which greatly increases the construction efficiency.

[0034] After the second trenching, the lower replacement support is installed under the wall and used in conjunction with the jacking to tighten the wall. All the soil between the pre-fixed parts and the wall foundation of the original masonry wall is dug out and cast to form a replacement beam under the wall. During the construction stage of the replacement beam under the wall, the lower replacement support can be cast into the replacement beam under the wall, greatly increasing the stiffness of the foundation beam.

[0035] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an overall schematic diagram of a construction method for integrally underpinning a foundation under a masonry wall according to the present invention after construction is completed;

[0037] Figure 2It is a cross-sectional schematic diagram of a pre-fixed member of a construction method for integrally underpinning a foundation under a masonry wall according to the present invention;

[0038] Figure 3 It is a schematic diagram of a construction condition of a construction method for integrally underpinning a foundation under a masonry wall according to the present invention;

[0039] Figure 4 It is a second schematic diagram of the construction working condition of the construction method of the present invention for integrally underpinning the foundation under the masonry wall;

[0040] Figure 5 It is a third schematic diagram of the construction working condition of the construction method of the present invention for integrally underpinning the foundation under the masonry wall;

[0041] Figure 6 It is a fourth schematic diagram of the construction working condition of the construction method of the present invention for integrally underpinning the foundation under the masonry wall;

[0042] Figure 7 It is a fifth schematic diagram of the construction working condition of the construction method of the present invention for integrally underpinning the foundation under the masonry wall;

[0043] Figure 8 It is a sixth schematic diagram of the construction working condition of the construction method of the present invention for integrally underpinning the foundation under the masonry wall;

[0044] Fig. 9 The seventh schematic diagram is a construction working condition of a construction method for integrally replacing a foundation under a masonry wall according to the present invention. DETAILED DESCRIPTION

[0045] The following description is used to fully explain the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0046] See also Figure 1-9 The present invention provides a technical solution: a construction method for overall underpinning of a masonry wall foundation, wherein it should be noted that frame columns 200 are arranged on both sides of the span of the original masonry wall 100, and the bottom of the frame columns 200 is connected to a column foundation 800, and a wall foundation 300 is arranged below the original masonry wall 100, wherein the wall foundation 300 can be a natural foundation or a ground beam.

[0047] The construction method comprises the following steps:

[0048] S1. Installing pre-fixed members 400 on both sides of the original masonry wall 100 in the thickness direction where the wall foundation 300 needs to be replaced as a whole, the pre-fixed members 400 are arranged along the span direction of the original masonry wall 100, and the pre-fixed members 400 are arranged close to the bottom of the original masonry wall 100;

[0049] See also Figure 2-4 The installation method between the pre-fixed member 400 and the original masonry wall 100 in the above step S1 is as follows:

[0050] S11. A first bolt hole 401 is opened along the thickness direction of the original masonry wall 100 to connect the two sides of the original masonry wall 100 in the thickness direction. The number of the first bolt holes 401 is multiple, and the first bolt holes 401 are arranged in sequence along the span direction of the original masonry wall 100. The pre-fixed member 400 is provided with a second bolt hole 402 corresponding to the first bolt hole 401 one by one;

[0051] S12. The fastener 403 is sequentially inserted into the second bolt hole 402 on one of the pre-fixed members 400, the first bolt hole 401 and the second bolt hole 402 on the other pre-fixed member 400 and fixed, that is, the pre-fixed member 400 is fixed through the wall by the fastener 403;

[0052] The above step S12 specifically also includes the following steps:

[0053] S121. The fastener 403 includes a bolt 4031 and a nut 4032, wherein the bolt 4031 is sequentially inserted into the second bolt hole 402, the first bolt hole 401 and the second bolt hole 402 on one of the pre-fixed members 400, and the end of the bolt 4031 is exposed on the side of the pre-fixed member 400 away from the original masonry wall 100;

[0054] S122 . Install nuts 4032 on the two ends of the bolt 4031 respectively to fix the pre-fixed component 400 on the original masonry wall 100 .

[0055] S13. The gap between the first bolt hole 401 and the fastener 403 is sealed by glue filling.

[0056] Preferably, in the span direction of the original masonry wall 100 , adjacent fasteners 403 are arranged at equal intervals.

[0057] In one embodiment, the pre-fixed member 400 is a channel steel, the specification of the pre-fixed member 400 is 20b, and the fastener 403 is a specification of HRB400, The bolts are provided, the spacing between adjacent fasteners 403 is 500 mm, the distance between the bottom end of the pre-fixed member 400 and the bottom end of the original masonry wall 100 is 1000 mm, wherein the fastener 403 is located above the ground, and the two ends of the pre-fixed member 400 are respectively aligned with the two ends of the original masonry wall 100 in the span direction.

[0058] S2. Install the upper support member 500 between the frame column 200 and the pre-fixed member 400. The upper support member 500 is supported and connected to the frame column 200 and the pre-fixed member 400, so that the original masonry wall 100 located above the pre-fixed member 400 has a certain bearing capacity.

[0059] See also Figure 5-6 The above-mentioned installation of the upper support member 500 specifically includes the following steps:

[0060] S21. A first trough 101 is formed by cutting a groove in the original masonry wall 100, wherein the first trough 101 is located below the pre-fixed member 400;

[0061] Preferably, in step S21, the number of the first trough bodies 101 is multiple, and the first trough bodies 101 are arranged in the middle of the span of the original masonry wall 100 and at a quarter of the span of the original masonry wall 100, so as to facilitate the subsequent installation of the upper replacement support member 500;

[0062] Preferably, in step S21, the top of the first trough 101 is flush with the bottom of the pre-fixing member 400, so that when the lifting member 501 is subsequently inserted into the first trough 101, a small gap is left between the top of the lifting member 501 and the bottom of the pre-fixing member 400, which facilitates the welding and fixing operation of the two.

[0063] In one embodiment, the size of the first trough body 101 is 600 mm×100 mm, and the distance between the top of the first trough body 101 and the bottom of the original masonry wall 100 is 1000 mm.

[0064] S22. The upper support member 500 includes: a lifting member 501 and a tensioning rod 502, wherein the lifting member 501 is installed in the first trough body 101, wherein the first trough body 101 and the lifting member 501 correspond one to one, the lifting member 501 and the pre-fixing member 400 are fixedly connected, one end of the tensioning rod 502 is connected to the lifting member 501, and the other end of the tensioning rod 502 is connected to the frame column 200.

[0065] In step S22, the connection position of the tie rod 502 and the frame column 200 is located above the pre-fixed component 400. Preferably, the angle between the tie rod 502 and the horizontal plane is close to 30°. That is, the tie rod 502 is inclined, and the tie rod 502, the pre-fixed component 400 and the frame column 200 form a triangle to ensure the stability of the original masonry wall 100 above and improve the operability of foundation replacement.

[0066] In one embodiment, the lifting member 501 is a channel steel, the specification of the lifting member 501 is 25a, the length of the lifting member 501 is 500mm, and the specification of the tie rod 502 is HRB400, The lifting member 501 and the pre-fixing member 400 are connected to each other by welding;

[0067] See also Figure 1 The tie bars 502 are divided into two groups, each group has two tie bars 502, namely the first bar and the second bar. The tie bars 502 in each group are inclined toward the same side of the span direction of the original masonry wall 100, and the inclination directions of the two groups of tie bars 502 are opposite. The first bar is connected to the lifting member 501 located in the middle of the span of the original masonry wall 100, and the second bar is connected to the lifting member 501 located on one side of the span direction of the original masonry wall 100.

[0068] S3. See Figure 7 and 8 A lower support member 600 is installed between the wall foundation 300 and the pre-fixed member 400 .

[0069] Specifically, the above step S3 includes the following steps S21 and S32;

[0070] S31. The original masonry wall 100 located below the pre-fixed member 400 is grooved to form a second groove body 102, the number of the second groove bodies 102 is multiple, and the second groove bodies 102 are arranged in sequence along the span direction of the original masonry wall 100. The bottom end of the second groove body 102 is flush with the top end of the wall foundation 300, that is, the bottom end of the second groove body 102 is close to the wall foundation 300. When a connecting beam is provided above the wall foundation 300, the bottom end of the second groove body 102 is close to the connecting beam;

[0071] Preferably, in step S31, the distance between adjacent second tank bodies 102 is no greater than 1000 mm. In one embodiment, the size of the second tank body 102 is 400 mm×900 mm.

[0072] S32. Install the lower support member 600 in the second trough 102. Similarly, the distance between adjacent lower support members 600 is no more than 1000 mm. The lower support member 600 is supported tightly against the original masonry wall 100 above.

[0073] In step S32, a precast concrete slab 601 is laid below the lower support member 600. When a connecting beam is provided above the wall foundation 300, the precast concrete slab 601 may not be laid.

[0074] S4. After the force of the lower support member 600 and the lifting member 501 is stabilized, the soil between the original masonry wall 100 and the pre-fixed member 400 and the wall foundation 300 is completely removed;

[0075] S5. For overall construction of the replacement foundation, see Fig. 9 , timely cast the position of the soil dug out in step S4 to form a wall replacement beam 700, wherein the lower replacement support 600 is cast in the wall replacement beam 700 to increase the rigidity of the foundation beam and ensure the quality of the newly constructed foundation structure.

[0076] Optionally, the upper support member 500 and the lower support member 600 are channel steel, steel pipe or steel section.

[0077] It should be noted that in step S4 , the volume of the soil between the pre-fixed component 400 and the wall foundation 300 is much larger than the volume of the second trough body 102 , and the volume of the second trough body 102 is much larger than the volume of the first trough body 101 .

[0078] In summary, this construction method can ensure the safety and stability of the masonry structure during the construction process to a large extent, and at the same time has the advantages of convenient construction, fast construction speed, and high quality of the basic structure of the construction;

[0079] Before the construction of the underpinning beam 700 under the original masonry wall 100, pre-fixed parts 400 are pre-installed on both sides of the original masonry wall 100 in the thickness direction, and the channel steel is fixed through the wall with bolts 4031, and the holes of the bolts 4031 are filled with glue to ensure the stability and safety of the masonry structure during the construction process;

[0080] Before large-scale grooving, the first grooving is carried out in advance at the mid-span and one-quarter span of the original masonry wall 100, and the lifting member 501 is installed at the first grooving. The lifting member 501 is connected to the frame column 200 by using tie rods 502. The lifting member 501 and the pre-fixed member 400 are connected to each other by welding, so that the masonry structure has a certain self-bearing capacity. Therefore, the second grooving can be performed at the bottom of the original masonry wall 100 in a one-time, large-area interval grooving to form the second trough body 102 without affecting the stability and safety of the structure of the original masonry wall 100 located above the pre-fixed member 400, thereby greatly increasing the construction efficiency.

[0081] After the second trenching, the lower replacement support 600 is installed under the wall and used in conjunction with the jacking to tighten the wall, and all the soil between the pre-fixed parts 400 and the wall foundation 300 of the original masonry wall 100 is dug out, and cast to form a replacement beam 700 under the wall. During the construction phase of the replacement beam 700 under the wall, the lower replacement support 600 can be cast into the replacement beam 700 under the wall, greatly increasing the rigidity of the foundation beam.

[0082] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by this embodiment, that is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A construction method for overall underpinning of a foundation under a masonry wall, wherein frame columns (200) are arranged on both sides of the span of an original masonry wall (100), and a wall foundation (300) is arranged below the original masonry wall (100), characterized in that: The construction method comprises: Pre-fixed members (400) are arranged along the span direction on both sides of the original masonry wall (100) in the thickness direction, and the pre-fixed members (400) are fixed through the wall; Installing an upper support member (500) between the frame column (200) and the pre-fixing member (400); A lower replacement support member (600) is installed between the wall foundation (300) and the pre-fixed member (400), and the lower replacement support member (600) is supported and pressed against the original masonry wall (100) above; Remove all the soil between the pre-fixed component (400) and the wall foundation (300) of the original masonry wall (100); The location where the soil is dug out is cast to form a supporting beam (700) under the wall.

2. A construction method for integrally replacing the foundation under a masonry wall according to claim 1, characterized in that: The specific method for implementing the pre-fixing member (400) through the wall for fixing includes: A first bolt hole (401) is provided along the thickness direction of the original masonry wall (100) to connect the two sides of the original masonry wall (100) in the thickness direction, the number of the first bolt holes (401) is multiple, the first bolt holes (401) are arranged in sequence at intervals along the span direction of the original masonry wall (100), and the pre-fixed component (400) is provided with second bolt holes (402) corresponding to the first bolt holes (401) one by one; The fastener (403) is sequentially inserted into the second bolt hole (402) on one of the pre-fixed components (400), the first bolt hole (401) and the second bolt hole (402) on another pre-fixed component (400) and fixed.

3. A construction method for integrally replacing the foundation under a masonry wall according to claim 2, characterized in that: The fastener (403) is sequentially inserted into the second bolt hole (402) on one of the pre-fixed members (400), the first bolt hole (401), and the second bolt hole (402) on another pre-fixed member (400) and fixed, and the specific implementation method thereof includes: The fastener (403) comprises a bolt (4031) and a nut (4032), the bolt (4031) is sequentially inserted into the second bolt hole (402) on one of the pre-fixed components (400), the first bolt hole (401), and the second bolt hole (402) on another pre-fixed component (400), and the end of the bolt (4031) is exposed on a side of the pre-fixed component (400) facing away from the original masonry wall (100); Nuts (4032) are respectively installed on the two ends of the bolt (4031) to fix the pre-fixed component (400) on the original masonry wall (100).

4. A construction method for integrally replacing the foundation under a masonry wall according to claim 1, characterized in that: The gap between the first bolt hole (401) and the fastener (403) is sealed by glue filling.

5. A construction method for integrally replacing the foundation under a masonry wall according to claim 1, characterized in that: The upper support member (500) is installed between the frame column (200) and the pre-fixed member (400), and the specific implementation method thereof includes: A first groove (101) is formed by cutting a groove in the original masonry wall (100), wherein the first groove (101) is located below the pre-fixed component (400); The upper support member (500) includes a lifting member (501) and a tensioning rod (502), wherein the lifting member (501) is installed in the first trough body (101), and the lifting member (501) and the pre-fixing member (400) are fixedly connected, one end of the tensioning rod (502) is connected to the lifting member (501), and the other end of the tensioning rod (502) is connected to the frame column (200).

6. A construction method for integrally replacing the foundation under a masonry wall according to claim 5, characterized in that: There are a plurality of first trough bodies (101), and the first trough bodies (101) correspond to the lifting members (501) one by one. The first trough bodies (101) are arranged at the middle of the span of the original masonry wall (100) and at a quarter of the span of the original masonry wall (100); The top end of the first groove body (101) is flush with the bottom end of the pre-fixing member (400).

7. A construction method for integrally replacing the foundation under a masonry wall according to claim 5, characterized in that: The connection position between the tie rod (502) and the frame column (200) is located above the pre-fixed component (400), and the angle between the tie rod (502) and the horizontal plane is close to 30°.

8. A construction method for integrally replacing the foundation under a masonry wall according to claim 1, characterized in that: A lower support member (600) is installed between the wall foundation (300) and the pre-fixed member (400), and a specific implementation method thereof includes: The original masonry wall (100) located below the pre-fixed component (400) is grooved to form a second groove body (102), wherein the number of the second groove bodies (102) is multiple, and the second groove bodies (102) are arranged in sequence along the span direction of the original masonry wall (100), and the bottom end of the second groove body (102) is flush with the top end of the wall foundation (300); The lower replacement support member (600) is installed in the second trough body (102), and the lower replacement support member (600) is supported tightly against the original masonry wall (100) above.

9. A construction method for integrally replacing the foundation under a masonry wall according to claim 8, characterized in that: If a connecting beam is provided above the wall foundation (300), a precast concrete slab (601) is laid below the lower support member (600).

10. A construction method for integrally replacing the foundation under a masonry wall according to claim 1, characterized in that: The construction method further comprises casting the lower replacement support member (600) in the under-wall replacement beam (700).

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