Reinforced brick blank film retaining wall and construction method
By setting tension reinforcing bars in the holes of porous bricks and combining them with concrete pouring, the problem of low tensile and shear strength of brick masonry retaining walls was solved, thereby improving the bending resistance and overall stability of the retaining walls, while reducing construction difficulty and cost.
Patent Information
- Application Number
- CN202610046363.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-14
- Publication Date
- 2026-02-17
AI Technical Summary
Traditional brick masonry retaining walls have low tensile and shear strength, weak bending performance, and are prone to cracking and tilting failure. Moreover, they are complex to construct and costly, making them unsuitable as temporary support structures.
Tension reinforcement bars are installed in the holes of the porous bricks. Combined with the compressive strength of the retaining wall body, through holes are formed in the porous bricks that are in contact with the upper and lower parts of the retaining wall body. Tension reinforcement bars are inserted into the holes, and concrete is poured at the bottom to enhance the bending resistance and overall stability.
It effectively enhances the bending resistance and overall stability of the retaining wall, simplifies the construction process, and significantly reduces construction costs.
Smart Images
Figure CN121539013A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a reinforced brick membrane retaining wall and a construction method. BACKGROUND
[0002] In civil engineering, the base pit side wall retaining wall body is an important temporary supporting structure for retaining soil, which supports the side wall soil to prevent collapse, and is widely used as a concrete pouring form in various project constructions. Brick masonry is a brittle material with low tensile and shear strength (brick masonry shear strength is only 0.1-0.2 MPa), and its bending performance is weak, mainly relying on the strength of a single material to resist soil pressure. The effect of retaining soil under the action of deep foundation pit or large filling is very unsatisfactory, and it is difficult to resist lateral soil pressure and water pressure of the foundation pit. Under the bending moment generated by the soil on the side wall, it is easy to crack and tilt and even collapse. The materials used in traditional retaining walls include concrete and stone, which have high strength and stability, but the construction is complex, the cost is high, and the foundation has a large impact range, which is not suitable for temporary supporting structure. SUMMARY
[0003] In view of the deficiencies of the prior art, the present application aims to provide a reinforced brick membrane retaining wall and a construction method, which effectively enhances the bending resistance and overall stability of the retaining wall body by taking full advantage of the tensile performance of the tensile reinforcing bar and the compressive performance of one side of the retaining wall body, while simplifying the construction process and significantly reducing the construction cost.
[0004] The technical solution adopted by the present application to solve its technical problems is: a reinforced brick membrane retaining wall, comprising a retaining wall body matched with the depth of the foundation pit, the retaining wall body being built by multiple perforated bricks, the holes of the multiple perforated bricks in contact with the retaining wall body being connected to form a plug-in hole penetrating along the height direction of the retaining wall body, each multiple perforated brick being matched with at least one tensile reinforcing bar smaller than the plug-in hole, the tensile reinforcing bar being inserted into the plug-in hole of the retaining wall body, and the length of the tensile reinforcing bar being matched with the depth of the foundation pit.
[0005] In the above embodiment, the plug-in hole of the retaining wall body in which the tensile reinforcing bar is inserted is filled with concrete.
[0006] In the above embodiment, the holes in the multiple perforated bricks are divided into two groups in the length direction, the two groups of holes are symmetrically arranged along the central axis in the length direction, the spacing between the two groups of holes is d, the diameter of the holes in each group of multiple perforated bricks is c, the edge distance of the holes is a, and the spacing between adjacent holes is also a.
[0007] In the above embodiment, the bottom of the retaining wall body is provided with a concrete cushion layer, and the bottom of the tensile reinforcing bar is inserted into the concrete cushion layer.
[0008] The present application also includes a construction method of the above-mentioned reinforced brick membrane retaining wall, which specifically comprises the following steps:
[0009] S1, selecting a perforated brick model, calculating the design thickness of the retaining wall body according to the foundation pit condition;
[0010] S2, according to the group masonry method and the design thickness of the retaining wall body calculated in S1, masonry the retaining wall body in the foundation pit;
[0011] S3, calculating the reinforcement value , according to the reinforcement value, arranging the tensile reinforcement in the insertion hole of the retaining wall body;
[0012] S4, grouting in the insertion hole of the retaining wall body containing the tensile reinforcement.
[0013] In the above embodiment, in S2, the one-in-one-ding masonry method is adopted, according to the design thickness of the retaining wall body in S1 , the standard size perforated brick is selected according to the specification, and the actual thickness of the retaining wall body after masonry is required to be not less than the design thickness of the retaining wall body , and the perforated bricks in contact with each other are required when masonry.
[0014] In the above embodiment, according to the reinforcement value obtained in step S3 , the tensile reinforcement is arranged in the hole of the perforated brick, and the specific arrangement method of the tensile reinforcement is as follows: at least one tensile reinforcement is arranged in each perforated brick; and according to the requirement of arranging at least one tensile reinforcement in each perforated brick, the maximum diameter D of the tensile reinforcement and the actual number of tensile reinforcements in each perforated brick are calculated by using the reinforcement value .
[0015] Due to the above technical scheme, the present application has the following advantages:
[0016] 1. The present application comprises a reinforced brick membrane retaining wall, by arranging the tensile reinforcement in the hole of the perforated brick, by fully utilizing the tensile performance of the tensile reinforcement and the compression performance of one side of the retaining wall body, effectively enhancing the bending resistance and overall stability of the retaining wall body, at the same time simplifying the construction process and significantly reducing the construction cost.
[0017] 2. The hole of the perforated brick in the present application adopts a customized hole, the spacing of the hole and the margin of the hole are the same, which ensures that the adjacent perforated bricks can be in contact when masonry.
[0018] 3. The application also comprises a construction process of the reinforced brick membrane retaining wall, the construction process calculates the most reasonable thickness of the retaining wall body and the reinforcement value through the conditions of the foundation pit, can guide the selection of the perforated brick model, the selection of the tensile reinforcing bar diameter and the scheme of the tensile reinforcing bar arrangement in the perforated brick, so that the construction personnel can be intuitively guided, the construction difficulty is reduced, the construction process is simplified, the thickness of the retaining wall body is ensured to be not too thick or too thin, the construction cost is significantly reduced, and the finally built reinforced brick membrane retaining wall can resist the corresponding lateral soil pressure and water pressure of the foundation pit. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 The structure diagram of the perforated brick in the application.
[0020] Figure 2 The hole arrangement diagram of the perforated brick in the application.
[0021] Figure 3 The reinforced arrangement interval diagram of the membrane retaining wall in the application.
[0022] Figure 4 The grouting diagram of the membrane retaining wall in the application.
[0023] Figure 5 The state diagram of the membrane retaining wall in the application after construction.
[0024] Figure 6 The perforated brick assembly diagram in the application. Figure 1 .
[0025] Figure 7 The perforated brick assembly diagram in the application. Figure 2 .
[0026] Figure 8 The force analysis diagram of the membrane retaining wall in the application.
[0027] Figure 9 The relationship between the thickness of the retaining wall body and the retaining height and the internal friction angle of the soil in the application. DETAILED DESCRIPTION
[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0029] like Figures 1 to 7 The present invention proposes a reinforced brick formwork retaining wall, comprising a retaining wall body matching the depth of the foundation pit. The retaining wall body is constructed of perforated bricks, and the holes of the perforated bricks in contact with the upper and lower parts of the retaining wall body are interconnected to form an insertion hole extending along the height direction of the retaining wall body. Each perforated brick is equipped with at least one tension bar smaller than the insertion hole, and the tension bar is inserted into the insertion hole of the retaining wall body. Figure 4 , 5 As shown, a concrete pad is provided at the bottom of the retaining wall body, and the bottom of the tension bar is inserted into the concrete pad. The length of the tension bar matches the depth of the foundation pit. Concrete is poured into the insertion holes of the tension bar in the retaining wall body.
[0030] like Figure 2 As shown in this embodiment, the holes on the porous brick are divided into two groups along the length direction. The two groups of holes are symmetrically arranged along the central axis of the length direction. The distance between the two groups of holes is d. The diameter of the holes on each group of porous bricks is c. The edge distance of the holes is a. The distance between adjacent holes is also a.
[0031] This invention also includes a construction method for a reinforced brick formwork retaining wall, specifically comprising the following steps:
[0032] S1. Select the perforated brick model and calculate the thickness of the retaining wall body according to the condition of the foundation pit;
[0033] S11. Calculate the required thickness of the retaining wall body to resist the lateral pressure of the retaining wall:
[0034] Assume the retaining height of the foundation pit is Temporary support is provided using the retaining wall itself.
[0035] Calculating Rankine active earth pressure :
[0036] (1)
[0037] in, It is the density of soil, unit: , It refers to the retaining height, in meters (m). It is the active earth pressure coefficient:
[0038] (2)
[0039] in The internal friction angle of the soil;
[0040] S12. Calculate the design thickness of the retaining wall body:
[0041] The earth pressure per unit length of the retaining wall is the Rankine active earth pressure. When the retaining wall body is reinforced with tensile reinforcement to enhance its overall bending and shear resistance, and the retaining wall body is constructed with porous bricks using cement mortar, the shear bearing capacity per unit length of the retaining wall body is: :
[0042] (3)
[0043] in This represents the design value of the horizontal shear strength of the retaining wall body. The width of the retaining wall body is the cross-sectional width. The thickness of the retaining wall body. This represents the design value of the tensile strength of the reinforcing bars within the retaining wall structure. The coefficient for the shear resistance efficiency of the tension reinforcement bars in the retaining wall body. The preferred value is 0.3~0.5. To account for the reinforcement value of the dowel bars participating in shear resistance, Based on the perforated brick model selected in S1, the spacing and diameter of the pre-set insert bars are determined by using the hole spacing of adjacent perforated bricks as the basis for the calculation. The following example illustrates this:
[0044] like Figure 3 As shown, assuming the mortar joint thickness is 10mm, a=25mm, c=20mm, and d=60mm, then S1=45mm, S2=80mm, S3=125mm, and S4=170mm. Therefore, the reinforcement spacing has two possibilities: S3=125mm, (S1+S2) / 2=62.5mm, and (S2+S4) / 2=125mm. The reinforcement diameter, spacing, and reinforcement values are shown in Table 1.
[0045]
[0046] In this embodiment, a preferred steel bar diameter is 6mm and a reinforcement spacing of 125mm is selected. 226mm 2 As a calculated value;
[0047] Horizontal shear force per unit length of retaining wall ,when The thickness of the retaining wall body can be obtained according to formulas (1), (2), and (3). for:
[0048] (4);
[0049] Commonly used specifications for perforated bricks include 240mm×115mm×53mm and 190mm×190mm×90mm. The actual thickness of the retaining wall body should not be less than the designed thickness of the retaining wall body. The perforated bricks have holes arranged on the top so that when the perforated bricks are laid in a header and stretcher pattern, the holes can be aligned vertically.
[0050] S2. Based on the masonry method and the design thickness of the retaining wall body calculated in S1, construct the retaining wall body in the foundation pit.
[0051] like Figure 2 As shown, the arrangement of the custom holes on the perforated brick is as follows: Let the length of the perforated brick be A and the width be B. The holes on the perforated brick are divided into two groups along the length direction. The two groups of holes are symmetrically arranged along the central axis of the length direction. The distance between the two groups of holes is d. The diameter of the holes in each group of perforated bricks is c. The edge distance of the holes in each group of perforated bricks is a. The distance between adjacent holes in each group of perforated bricks is a. The holes are square holes or round holes. Here, the edge distance refers to the shortest distance between the outermost hole on the perforated brick and the edge of the perforated brick. The distance between adjacent holes refers to the shortest distance between the outer edges of adjacent holes in the same row or column. Finally, the perforated brick retaining wall is constructed by alternating headers and stretchers.
[0052] In this embodiment, when the design thickness of the retaining wall body is... When the length A is greater than one block length of the retaining wall body, the following can be used: Figure 6 or Figure 7 Constructed in the manner shown;
[0053] S3, Calculate reinforcement values Tension reinforcement bars are installed in the holes of the retaining wall body according to the reinforcement value.
[0054] S31. Calculate reinforcement values:
[0055] Derivation of the principle of cross-section bending resistance: Based on the principles of mechanics of materials, and given the design thickness of the retaining wall body, the distribution of internal forces and deformation of the reinforced retaining wall body under bending moment is derived by assuming a plane section, thereby analyzing the required reinforcement value of the tensile-reinforced retaining wall body under external earth pressure.
[0056] Specifically:
[0057] like Figure 8As shown, let the bending moment generated by the earth pressure per unit length (here, 1m is taken as the unit length) on the bottom of the retaining wall be... :
[0058] (5)
[0059] For active earth pressure, The height of the retaining wall, in meters (m).
[0060] When subjected to bending, the lower part of the brickwork is under tension and the upper part is under compression. By installing tension reinforcement bars, the tensile stress on the bending section can be effectively resisted, thereby improving the overall bending resistance and the bending bearing capacity of the reinforced retaining wall. It can be represented as:
[0061] (6)
[0062] Flexural bearing capacity requirements of the retaining wall body's cross-section: ;
[0063] in, The width of the retaining wall body is the cross-sectional width. The thickness of the retaining wall body. The effective thickness of the retaining wall body is the distance from the center axis of the tension reinforcement bar closest to the foundation pit within the retaining wall body to the inner wall of the foundation pit; for example... Figure 2 As shown in this embodiment,
[0064] (7)
[0065] To calculate the reinforcement values, This is the design value of the tensile strength of the reinforcing bar. The bonding efficiency coefficient between the tension reinforcement bars and the porous brick with mortar is given. The preferred value is 0.75~0.9. The height of the compression zone of the bending section of the retaining wall. This represents the design value of the compressive strength of the retaining wall body. According to the masonry specifications, and based on formula (6), we can obtain:
[0066] (8)
[0067] The relative height of the pressure zone can then be obtained. for:
[0068] (9)
[0069] in , The reinforcement ratio of the retaining wall body is then:
[0070] (10)
[0071] make ;
[0072] (11)
[0073] For a single-sided reinforced retaining wall, given the bending moment at the bottom of the retaining wall body... and the effective height of the cross section of the retaining wall body ;
[0074] Then reinforcement value (12)
[0075] In this embodiment, wherein , The limit value for the relative height of the compression zone is determined with reference to the limit values for the relative height of the compression zone of composite brick masonry components in the "Code for Design of Masonry Structures". For HRB400 grade tension reinforcement, the value is 0.36; for HRB335 grade tension reinforcement, the value is 0.44; and for HPB300 grade tension reinforcement, the value is 0.47. For retaining walls using perforated bricks as the retaining wall body, HRB400 grade tension reinforcement is used. The possible value is 0.35;
[0076] ;
[0077] The calculated reinforcement value in this embodiment is... (13);
[0078] S32. Tension reinforcement bars are installed within the retaining wall body:
[0079] Based on the calculated reinforcement values obtained in step S31 Tensile reinforcement bars are installed in the holes on one side of the porous brick. The installation method for the tensile reinforcement bars is as follows:
[0080] Under the condition that at least one tensile reinforcement bar is required in each porous brick, the reinforcement value should be utilized. Calculate the maximum diameter D of the required tension reinforcement bars and the actual number of tension reinforcement bars for each porous brick, and then insert the tension reinforcement bars into the holes of the porous brick.
[0081] S4. Grouting of holes containing tension reinforcement bars in porous bricks:
[0082] like Figure 4 As shown, grouting is performed inside the insertion holes equipped with tension bars to fix the tension bars within the holes, ensuring the synergistic effect between the tension bars and the brickwork. Furthermore, as...Figure 4 , 5 As shown, a concrete pad layer can be added to the bottom of the retaining wall body, and the bottom of the tension reinforcement can be inserted into the concrete pad layer and anchored by grouting; alternatively, the tension reinforcement can be inserted into the soil layer and then anchored by grouting, thus improving the tension anchoring effect of the tension reinforcement.
[0083] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any reinforced brick formwork retaining wall and construction method that conforms to the claims of the present invention, and any appropriate changes or modifications made by those skilled in the art, shall fall within the patent protection scope of the present invention.
Claims
1. A reinforced brick formwork retaining wall, comprising a retaining wall body matching the depth of the foundation pit, characterized in that: The retaining wall body is constructed of porous bricks. The holes of the porous bricks in contact with the upper and lower parts of the retaining wall body are interconnected to form a through hole along the height direction of the retaining wall body. Each porous brick is equipped with at least one tension bar smaller than the through hole. The tension bar is inserted into the through hole of the retaining wall body, and the length of the tension bar matches the depth of the foundation pit.
2. The reinforced brick formwork retaining wall according to claim 1, characterized in that: The retaining wall body has holes for tension reinforcement bars, into which concrete is poured.
3. The reinforced brick formwork retaining wall according to claim 1, characterized in that: The holes on the porous brick are divided into two groups along the length direction. The two groups of holes are symmetrically arranged along the central axis of the length direction. The distance between the two groups of holes is d. The diameter of the holes on each group of porous bricks is c. The distance between the holes and the edge of the porous bricks is a. The distance between adjacent holes is also a.
4. The reinforced brick formwork retaining wall according to claim 1, characterized in that: A concrete pad is provided at the bottom of the retaining wall body, and the bottom of the tension reinforcement bar is inserted into the concrete pad.
5. A construction method for a reinforced brick formwork retaining wall as described in any one of claims 1 to 4, characterized in that: Specifically, the steps include the following: S1. Select the perforated brick model and calculate the design thickness of the retaining wall body based on the conditions of the foundation pit. ; S2. Based on the masonry method and the design thickness of the retaining wall body calculated in S1, construct the retaining wall body in the foundation pit. S3, Calculate reinforcement values Tension reinforcement bars are installed in the holes of the retaining wall body according to the reinforcement value. S4. Grouting is performed in the holes of the retaining wall body containing tension reinforcement bars.
6. The construction method for reinforced brick formwork retaining wall according to claim 5, characterized in that: In S2, a header-stretcher masonry method is used, based on the design thickness of the retaining wall in S1. According to the specifications, select perforated bricks of standard size, and ensure that the actual thickness of the retaining wall body after construction is not less than the design thickness of the retaining wall body. During construction, it is required that the perforated bricks that are in contact with each other be aligned.
7. The construction method for reinforced brick formwork retaining wall according to claim 5, characterized in that: Based on the reinforcement values obtained in step S3 Tensile reinforcement bars are installed in the holes on one side of the porous brick. The specific installation method for the tensile reinforcement bars is as follows: at least one tensile reinforcement bar is required in each porous brick; and based on the requirement of at least one tensile reinforcement bar in each porous brick, the reinforcement value is used. Calculate the maximum diameter D of the tension reinforcement and the actual number of tension reinforcements for each porous brick.