CN105908585A - Road foundation or base and building soft foundation grouting reinforcement method - Google Patents

Abstract

The invention discloses a grouting reinforcement method for road foundations or bases and building weak foundations. First, a grouting hole is drilled at a set reinforcement position; and then a grouting pipe body larger than the depth is prepared according to the depth of the grouting hole , and connect the grouting pipe body to the grouting pump; after the grouting pipe body is installed, turn on the grouting pump, and the grout flows into the grouting pipe body. At this time, under the pressure of the grout, the guide tube slides down along the guide groove, and stretches outward in the shape of a "ten", so that the nested guide tubes are expanded step by step; the grout flows from the grouting pipe body and the grouting holes set on the draft tube flow out separately, and the grout spreads to the predetermined grouting reinforcement position and range; finally stop the grouting and pull out the grouting pipe. The method of the invention enables the grout to diffuse in a wider range and is more evenly distributed in the soft ground, has a fast grouting speed, good grouting reinforcement effect, and can avoid the problem of secondary grouting.

Description

A kind of grouting reinforcement method for highway foundation or base course and building weak foundation

technical field

The invention relates to engineering construction, in particular to a grouting reinforcement method for highway foundations or bases and weak building foundations.

Background technique

During the use of the road, affected by the driving load and the natural environment, the road performance gradually declines, and various damages occur, many of which are related to the instability or insufficient strength of the base or foundation, such as cracks, uneven settlement, voiding Wait. Improving foundation strength and strengthening weak foundations are crucial to improving road performance and prolonging service life. The use of non-excavation grouting reinforcement technology to repair foundation diseases is convenient and quick, with a small amount of work and low cost. It avoids large filling and excavation, has little impact on traffic, and can significantly improve the bearing capacity of weak foundations and grassroots. It is gradually becoming a road important means of maintenance.

Trenchless grouting reinforcement technology is a comprehensive professional technology, and its repair effect is not only related to the grouting material, but also affected by the grouting process. The traditional grouting method uses a hard hollow pipe, and the grout is pushed down along the grouting pipe under the grouting pressure, and injected into the soft foundation from the bottom of the pipe. The slurry relies on its own fluidity to spread around, and it is easy to gather together, the diffusion is uneven, and the filling effect of the gap is poor. Because the grout is concentrated, it cannot be evenly distributed. Areas with too much grout will easily cause the foundation to rise too high, and areas with too little grout will have insufficient strength. The accumulation of grout at the port of the grouting pipe will also lead to a slow rate of grouting and increase the grouting pressure. The overall grouting reinforcement effect of the current grouting method is poor, which cannot well meet the actual requirements, and even requires secondary grouting.

Therefore, the research and development of a new grouting method, which can make the grout spread evenly and speed up the grouting speed, has great practical significance for perfecting the grouting process and improving the grouting reinforcement effect.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a grouting reinforcement for road foundations or bases and weak building foundations, which can make the grout spread evenly, speed up the grouting speed, and improve the effect of grouting reinforcement and repair. grouting method.

In order to solve the above-mentioned technical problems, the present invention provides a method of grouting reinforcement for highway foundations or bases and weak building foundations, comprising the following steps:

(1) Determine the grouting reinforcement position and range, and drill the grouting hole at the center of the set position and range;

(2) According to the depth of the grouting hole, prepare a grouting pipe body greater than its depth, the end of the grouting pipe body is a solid structure, and the solid part of the grouting pipe body is along the axial direction of the grouting pipe body Evenly open a flow guide groove that runs through the solid part, the upper end opening is set on the top of the solid part, and the lower end opening is set on the side wall of the grouting pipe body. The inner side of the end of the flow guide groove is set as a 90° arc structure; The flow channel is provided with a flow guide tube connected to the flow guide channel through the flow guide tube buckle provided on the outer side of the top;

(3) Connect a connecting pipe at the upper end of the grouting pipe body, then insert one end of the grouting pipe body along the grouting hole, and connect the other end with the grouting pump through the connecting pipe;

(4) Turn on the grouting pump, the grout flows into the grouting pipe body, and flows down along the grouting pipe body, when the grout flows to the end of the grouting pipe body, the grout flows into the diversion pipe;

(5) The guide tube slides downward along the guide groove under the action of the slurry pressure, and stretches outward in the shape of a "ten", so that the nested guide tubes are gradually expanded;

(6) The grout flows out from the grouting holes provided on the grouting pipe body and the draft pipe respectively, and the grout spreads until the predetermined grouting reinforcement position and range are reached;

(7) Stop grouting and pull out the grouting pipe.

The guide tube is composed of multi-stage nested semi-rigid hoses, and each graded guide tube is nested and connected step by step through the guide tube buckle and the guide tube slot.

The end of the guide tube is connected with a conical head of the guide tube, and a slurry outlet is arranged on the conical head of the guide tube.

A slurry outlet is opened on the side wall of the classification draft pipe.

The end inner wall of the circular arc structure of the diversion groove is provided with a grouting pipe body buckle which is fixed with the buckle of the diversion pipe.

A grouting hole communicating with the diversion groove is opened on the end side wall of the grouting pipe body.

A rubber pad is provided at the joint between the grouting pipe body and the connecting pipe.

The beneficial effects of the present invention are: the method of the present invention can divide the grouting slurry into four strands of slurry at the end of the grouting pipe, and flow out of the grouting pipe in a "ten" shape in different directions, so that the grouting range is wider and more evenly distributed in the grouting pipe. In the weak foundation, the grouting speed is fast, the grouting reinforcement effect is good, and the secondary grouting can be avoided.

Description of drawings

Fig. 1: Schematic diagram of the structure of the grouting pipe of the present invention;

Figure 2: Schematic diagram of the A-A cross-sectional structure of the grouting pipe of the present invention;

Figure 3: Schematic diagram of the structure of the draft tube of the present invention;

Figure 4: Schematic diagram of the structure when the draft tube of the present invention is deployed step by step.

Drawings: 1. Connecting pipe; 2. Rubber pad; 3. Thread; 4. Grouting pipe body; 5. Grouting hole; 6. Diversion pipe; 7. Diversion groove; 8. Grouting pipe body clamp Buckle; 9, buckle of the diversion tube; 10, slot of the diversion tube; 11, slurry outlet; 12, graded diversion tube; 13, conical head of the diversion tube; 14, slurry outlet.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

The present invention is a kind of road foundation or base course and building weak foundation grouting reinforcing reinforcement method, and its steps are:

First, determine the position of grouting reinforcement and the range to be reinforced within the scope of construction, and drill the grouting hole at the center of the set position and range;

Then according to the depth of the grouting hole, prepare the grouting pipe body 4 greater than its depth, that is, the length of the grouting pipe body 4 is determined according to the depth of the grouting hole, and can be lengthened or shortened thereupon; The structure of body 4, as shown in Fig. 1 to Fig. 3, the end of its grouting pipe body 4 is a solid structure, and the solid part of described grouting pipe body 4 is evenly opened along the axis direction of described grouting pipe body 4 A plurality of flow diversion grooves 7 that pass through the solid part, the upper end opening is arranged on the top of the solid part, and the lower end opening is arranged on the side wall of the grouting pipe body 4, the number of flow diversion grooves in this embodiment is set to four, and the flow diversion grooves The inner side of the end of the groove 7 is set as a 90° arc structure, the purpose is to make the diversion groove 7 form a smooth and transitional passage; the diversion groove 7 is provided with a diversion tube arranged on the outer side of the top The buckle 9 is connected to the guide tube 6 of the guide groove 7. The guide tube 6 is composed of a plurality of multi-stage nested graded guide tubes 12, and its material is made of semi-rigid hose. Each The graded guide tube 12 is nested and connected step by step through the guide tube buckle 9 arranged on the outside of its top and the guide tube slot 10 provided on the inner side of its end. When inside, a plurality of graded guide tubes 12 are overlapped together. When the guide tube 6 slides out of the guide groove 7, the multiple graded guide tubes 12 are deployed in stages under the pressure of the slurry, and are clamped and connected in series step by step. ; The end of the guide tube 6 is connected with a guide tube conical head 13, and the guide tube conical head 13 is provided with a slurry outlet 14. In this embodiment, the guide tube conical head 13 The tapered structure is beneficial to the guide tube 6 to slide out of the guide groove 7 smoothly under the pressure of the slurry, and to increase the strength of the outward extension; the end inner wall of the arc structure of the guide groove 7 is also provided with There is a grouting pipe buckle 8 that is locked with the guide pipe buckle 9 to prevent the guide pipe 6 from breaking away from the grouting pipe body 4; A plurality of grouting holes 11; the grouting pipe body 4 end side wall is also provided with a grouting hole 5 communicating with the diversion groove.

After completing the installation of the above-mentioned grouting pipe body 4, the upper end of the grouting pipe body 4 is connected to the connecting pipe 1 through the thread 3, and the connecting pipe 1 is connected to the grouting pump. For better sealing, the connection needs to be The rubber pad 2 is set, and the other end of the grouting pipe body 4 is inserted along the grouting hole; after the grouting pipe body 4 is inserted, the grouting pump can be turned on, the grout flows into the grouting pipe body 4, and is The body 4 flows downward, and when the slurry flows to the end of the grouting pipe body 4, the slurry diverges and flows into the guide tube 6; the guide tube 6 slides down along the guide groove 7 under the pressure of the slurry, and Stretching out in the shape of a "ten", the nested draft tube 6 is expanded step by step (as shown in Figure 4); the grout flows out from the grouting holes provided on the grouting tube body 4 and the draft tube 6 respectively, and the slurry Diffusion until reaching the pre-determined grouting reinforcement position and range; then stop the grouting, pull out the grouting pipe, and complete the whole process of the present invention's grouting reinforcement for road foundations or bases and building weak foundations.

Claims (7)

1. a highway foundation or basic unit and building soft foundation grouting and reinforcing reinforcement, it is characterised in that Comprise the following steps:

(1) determine grouting and reinforcing position and scope, and the center taking setting position and scope drills through injected hole；

(2) according to the degree of depth of injected hole, preparation is more than the slip casting body of its degree of depth, described slip casting body end Pass through for uniformly offering along described Grouting Pipe body axis direction in solid construction, the solid section of described slip casting body Wear solid section, upper end open is arranged on solid section top, lower ending opening is arranged on leading of Grouting Pipe body sidewall Chute, the end inboard of described guiding gutter is set to 90 ° of arc structures；It is provided with in described guiding gutter The mozzle that the mozzle buckle arranged in top outer is connected with described guiding gutter；

(3) connect connecting tube in described slip casting body upper end, then slip casting body one end inserted along injected hole, The other end is connected with grouting pump by connecting tube；

(4) opening grouting pump, serosity flows into Grouting Pipe body, and flows downward along slip casting body, works as slurry stream During to slip casting body end, slurry diversion, flow into mozzle；

(5) described mozzle is under slurry pressure effect, along guiding gutter slide downward, and in " ten " word Shape flexes outward, and makes nested type mozzle launch step by step；

(6) slurry outlet that serosity is arranged from slip casting body and mozzle flows out respectively, and serosity spreads, until Reach predetermined grouting and reinforcing position and scope；

(7) stop slip casting, extract Grouting Pipe.

Highway foundation the most according to claim 1 or basic unit and building soft foundation grouting and reinforcing reinforcement side Method, it is characterised in that described mozzle is that the semi-rigid flexible pipe of multistage nesting is constituted, each stepped diversion pipe By mozzle buckle and mozzle draw-in groove nested encryptions step by step.

Highway foundation the most according to claim 1 or basic unit and building soft foundation grouting and reinforcing reinforcement side Method, it is characterised in that the end of described mozzle connects has mozzle conical head, on described mozzle conical head It is provided with slurry outlet.

Highway foundation the most according to claim 1 or basic unit and building soft foundation grouting and reinforcing reinforcement side Method, it is characterised in that offer slurry outlet on the sidewall of described stepped diversion pipe.

Highway foundation the most according to claim 1 or basic unit and building soft foundation grouting and reinforcing reinforcement side Method, it is characterised in that be provided with in the inner wall at end of the arc structure of described guiding gutter and block mutually with mozzle buckle Solid slip casting body buckle.

Highway foundation the most according to claim 1 or basic unit and building soft foundation grouting and reinforcing reinforcement side Method, it is characterised in that offer, on described slip casting body end side wall, the slurry outlet being connected with described guiding gutter.

Highway foundation the most according to claim 1 or basic unit and building soft foundation grouting and reinforcing reinforcement side Method, it is characterised in that described slip casting body is provided with rubber cushion with the junction of described connecting tube.